As a result of excessive capacity,extensive development,increasingly environment pressure and lack of innovation,the industrial structure of coking industry in China is stepping into deep adjustment period.Under the circumstance that many companies got into unprecedented difficulties,it is essential to commence an intensive research on the positive and negative factors affecting the development of coking industry,analyzing the mainstream,reforming development patterns and taking corresponding measures to improve the value integration capability,reverse the passive situation and realize sustainable development of coking industry.
Based on the survey on the utilization of coal and chemical by-product and petrochemical industry by-product and waste resources in metallurgy chemical industrial park,this paper introduces the comprehensive recycling utilization of carbon resources of petrochemical industry,coal and chemical by-product and by-product of heat and power industry,and comprehensive utilization of the by-products of different industries.This paper also analyzes the main problems existed in the development of cycling economy in the park,and proposes constructive advice on the utilization of “three wastes” in the park.
This paper introduces the structure and corollary equipment of 200kg pilot coke oven.Coking experiments were performed to compare with 6m production coke oven.The result shows that the coke quality produced by the 200kg pilot coke oven has obvious linear relation with that produced by production coke oven.This relationship can be used to guide coal blending.
This paper puts forwards the design principle and method for the backstay of large coke oven,and analyzes the joint structure between backstay and flash plate and the loading condition of backstay.Three-dimensional simulation software is adopted for static analysis of backstay.The strength and rigidity of backstay is verified to ensure enough protection force from the backstay to large coke oven proper.
This paper introduces the improvement of coal moisture control in Baosteel from the aspects of process and equipment. New problems were found after the improved coal moisture control technology was put into operation,and accordingly measures were taken to solve the problems.Afterwards the running rate of equipment increased,abnormal shutdown of dryer decreased,steam condensate was completely recovered,and dust deposition in bag was avoided.
The condition of bracing system of European 6.25m stamp-charging coke oven is introduced.The structure and features of optimized bracing system of coke oven is described in detail.After modification of the bracing system,the tightness of coke oven is remarkably improved.
With the purpose of making full use of coke soaking in CDQ chamber,measures are taken to improve the uniformity and stability of temperature in coking chamber while reducing standard coke oven temperature,provided coke quality is ensured.
Based on the features of charging emission and pushing emission of stamp-charging coke oven,different technologies are adopted to control the emissions.With the combination of hardware process equipment and fuzzy control of coke oven gas collecting main pressure,charging emission is collected,and charging emission meets the environmental requirement.
Based on the production data of CDQ system,coke burning rate is calculated by several methods.The relationship between CDQ coke burning rate and steam generation per ton coke is analyzed.The influence of reducing coke burning rate to company economic benefit can be estimated through calculation.
For the reason that imported electric cylinder is too expensive and order cycle is long for Pan Steel CDQ,a home made CDQ electric cylinder is designed and verified. It is proved that the design meets operational requirement.
When blast furnace gas is used to heat bottom regulated coke oven with checker brick structure, the suction force of sole flue must be measured and regulated.A new measurement and regulation method has been developed to achieve more accurate and faster regulation of suction force, so as to ensure uniform and stable temperature in coking chamber.
This paper analyzes the reasons for the problems existed in automatic dust discharging of primary de-dusting of 75t CDQ, introduces a series of improvement onoperation and program. After improvement, dust collected by primary de-duster can be discharged automatically and dust discharging efficiency is remarkably increased.
This paper analyzes the problems of control panel for the pneumatic actuator of coke oven gas collecting system.Corresponding solutions are proposed to improve production safety and equipment maintenance,so as to ensure the adaptability and durability of pneumatic actuator under severe working condition of coke oven.
Vertical mill is pioneeringly used for preparation of coke breeze.This paper introduces the application of WJRM-10 vertical mill in the preparation of coke breeze from the aspects of principle,process and practical operation,providing an effective method of cost reduction.
With the development of large coke oven,it is inevitable to develop large scale coke oven gas refining system.Large desulfurization unit is the key for large scale coke oven gas refining system.The running condition of F/R desulfurization unit in Baosteel Phase IV is an example of large desulfurization unit.
The chemical property and reaction principle of NaOH and KOH are similar，so the replacement of KOH with NaOH in vacuum potassium desulphurization process is successful.Such replacement ensures desulphurization efficiency and reduces production cost.
This paper introduces the process flow of extractive distillation unit in the process of crude benzol hydro\|refining,states the start-up operation of extraction distillative unit after shutdown,analyzes the factors influencing start-up,and provides proposal and process for shortening start\|up time. Improvement brings the effects of energy saving and profit increasing.
To reduce steam consumption during ammonia stripping from coal water,large hole flow\|guided sieve tray is adopted in the design of ammonia stripper.Chemical engineering simulation software is used to simulate and optimize the relationship between number of trays and steam consumption.Compared with bubble cap ammonia stripper,steam consumption per ton coal water is reduced by 30kg,ammonia content in waste water is reduced to 30mg/L from 50~100mg/L,and it is more convenient to inspect and repair the ammonia stripper.
This paper introduces HPF desulfurization process and points out the necessity of secondary salt extraction from desulphurizing waste liquor.The available secondary salt extraction processes are described and analyzed from economic point of view.With secondary salt extraction，desulfurization efficiency is increased，catalyst consumption is reduced，production cost is reduced and environment protection level is improved.
This paper introduces two heating processes,i.e.steam and heat transfer oil heating for hydro-refining reboiler,and provides solution for the problems existing in steam heating.Comparison is made with respect to economic efficiency and safety,based on which suitable heating process can be selected as per actual condition.
This paper introduces the operation data and key points for operation of tar ammonia separator.With regard to the problems found during operation,suggestions are provided to improve and promote vertical tar ammonia separator.
Experiments have been conducted to compare phosphate treatment and equilibrium phosphate treatment.The result shows that by adopting equilibrium phosphate treatment,the high temperature and high pressure boiler runs stably with higher quality water and steam,and dosing amount of secondary ammonia to boiler feed water is reduced,hidden of phosphate is prevented and chemical dosing times and quantity are reduced.
Based on the application of medium and small transformers，this paper puts forward the idea of replacing aluminum winding with copper winding，and provides the design data for the replacement for 160kVA oil filled transformer.Application shows that the technical parameters meet the production requirement，and the transformer runs well.
This paper introduces the utilization pattern of extracting hydrogen from the coke oven gas PSA and the principle of applying it to make natural gas,as well as its technological process.From the perspective of the current market environment,the method of extracting hydrogen from the coke oven gas PSA to make natural gas is promising.
The paper introduces the existing technology of flue gas desulfurization and denitrification for industrial application.Combined with the research on parameters and components of the flue in the coke oven,the paper offers the technology routes of coke oven flue gas desulfurization and medium\|low temperature denitrification,and presents the contents and results of pilot scale test on the flue gas desulfurization and denitrification,furthermore,the solution to the flue gas purification of coke oven is finally put forward.
The traditional coal blending coking theory could not adapt modern coal source conditions as it is established based on single type of coal.It is necessary to determine the caking and coking properties of coking coal according to Chinese classification principles of coal and reflectance distribution diagram of commercial coal,which could also identify the degree of mixed coal,correctly evaluate the property of mixed coal and its role in coking coal blending,and make appropriate coal blending scheme through coking in small coke ovens.The test shows that reasonable use of mixed coal in coal blending could reduce negative factors of mixed coal in coal blending so that coke of high quality could be produced which could meet the requirement of blast furnace production.
This paper comprehensively analyzes A type coking coal with methods of coal petrography reflectance detection,Gieseler fluidity measurement,coking test with single coal and coal blending coking test etc. The test shows that The G value,Y value and industrial analysis index of A type coal are similar with and even better than other coking coal of the same kind,but its micromaceral is abnormal,and the ratio between reactive and inert components is as high as 19.2,maximum fluidity is only 32ddpm,and the thermal intensity of the produced coke from the single coal is as low as 5.26%.
This paper introduces the new technology of the blast furnace blowing of biomass,blue-coke,and coke oven gas etc.Which can substitute the function of pulverized coal to some extent.Such technology remits the shortage of coal resources and reduces the discharge of fuel gas and trash as well as finds an efficient way of their resources utilization.
This paper mainly elaborates the application of coal petrographic analysis in identification of coal types and evaluation of mixed coal，guidance of coal blending，prediction of coke quality，guidance in reasonable sub-heap of coal sent to the plant and determination of optical texture of coke.The study shows that the vitrinite reflectance distribution diagram of coal petrographic analysis has obvious effects in identification of quality of coal sent to the plant and evaluation of mixed coal，which could optimize the coal blending scheme，stabilize coke quality and guide reasonable sub-heap of coal types.
On the basis of searching，organizing and summarizing the patents on coking coalpretreatment of Nippon Steel，essential content of those patents are analyzed，providing certain reference for the study of coking coal pretreatment technology in China. Nippon Steel; Coking Coal; Pretreatment; Patent analysis
This paper analyzes the reasons for gain and loss of coal yard with systematic analysis on aspects including data collection,measuring scales,moisture,natural losses and statistics management details etc. to seek the reasons for deficient and excessive stock of coal yard,and proposes the effective measures and scientific adjustment methods for solving the problem.
This paper introduces several waste heat recovery methods in SITD coal moisture control system to reduce steam consumption in the system.The technologies of recovery of condensate flash steam in the system，power generation with hot water waste heat and utilization of coke oven flue gas waste heat adopted in the system can increase safety of the system and effectively reduce steam consumption.
Each pile of coal on coal storage yard is located by GPS positioning system, and the operation of each stacker reclaimer for each pile is accurately arranged through signal transmission.Such way can efficiently decrease the phenomena like piling the coal wrongly, or taking the coal in mistake, which is favorable to the management of coal yard and the cost decrease of blending coal.
This paper introduces the amendment status of standard GB/T 15591—2013 judging method for mixed coal type of commercial coal and the precautions for application of the standard,and it also discusses the determination method of vitrinite reflectance of commercial coal. Commercial coal; Mixed coal type; Vitrinite reflectance
Regarding to the pushing current fluctuation along with the change of coal blending ratio,influence of coal blending structure to pushing current of stamp-charging coke oven is studied.Under the present heating system,to ensure stable pushing current,the blending coal should be controlled as follows:volatile matter ≤26.1,caking index ≥66.9,and shrinkage of coal cake ≥7mm.
This paper introduces a method for overall repair of the bottom bricks of coking chamber,and proposes a control plan for temperature management during repairing.Practical production shows that the repaired coking chamber has similar indexes with other coking chambers,and from which coke can be pushed out easily.Therefore,the risk of high temperature radiation to human body is reduced and the service life of coke oven is prolonged.
Based on actual production condition of coke oven,a series of measures were taken to deal with the problems of COG pipeline,resistance of coke oven gas main pipe,flow meter measurement and other factors affecting coking heat consumption.As a result,coke oven gas consumption was effectively controlled and reduced remarkably.
This paper analyzes the reason of burnt loss rate of the coke with dry quenching.The burnt loss rate decreases from 1.2% to 0.9% through controlling related factors of burnt loss rate.Calculated as per 1 million ton of coke production,1 000 ton of coke can be reduced each year,and more than 1million economic benefits would be created,as well as the service life and interval time of annual overhaul for the CDQ chamber would be extended.
This paper studies the reason for high coking heat consumption of stamp-charging coke oven. The influence of moisture content,coke oven top space temperature,and waste gas temperature was studied.Under the precondition of ensuring coke quality,measures such as adopting suitable coke cake center temperature and suitable excess air coefficient,enhancing the management of coke oven proper temperature,and strictly controlling the operation of coke oven were taken to reduce the coking heat consumption. The effect turned out to be remarkable.
This paper introduces two routes to produce liquefied natural gas from coke oven gas: cryogenic liquefaction route and methanation route.Comparison of these two routes shows that the better investment mode for now is to firstly establish a plant with cryogenic liquefaction route for the purpose,and then reconstruct a methanation plant on basis of the established cryogenic liquefaction plant when the catalytic synthesis reaction of methanation route proves to be mature and reliable.
This paper deeply studies ultra-large type atmospheric and vacuum tar distillation technology,and proposes innovations on vacuum pump and feeding location of 1# column.The atmospheric and vacuum tar distillation process at capacity of 5×105t/a in WISCO has advantages of large capacity,advanced technology,being energy saving and environment friendly and high recovery rate of product.
Blended with asphalt，heavy residual oil，instead of a portion of anthracene oil，can be made up qualified fuel oil.Such method not only expands the market of asphalt，but also reduces the cost of fuel oil preparation.The research process is divided two parts: laboratory scale，through which optimum ratio can be got;and pilot production，through which all targets of the pilot production meet the requirements.
This paper explains the energy saving principles and advantages of electric fan of large scale cooling tower,and introduces the design procedure,modification project,data calculation and analysis,and energy saving calculation as well as static payback time of mixed flow water turbine special for cooling tower instead of motor. After modification,energy-saving purpose is achieved.
This paper introduces the application of China-made PVDF composite membrane and new type external submerged membrane module in advanced treatment of coke plant wastewater.PVDF has avoided the problems of wire break and exceeding amount of suspended solid in discharged water on condition of ensuring the flux.The new type membrane module has advantages of less space occupation and higher automation level,and the discharged water could be directly reused or used as feed water for reverse osmosis membrane.
According to theoretical analysis and practical experience, when determining the amount of coke oven gas for handling in the design,major influence factors which need be taken into account are provided.Amount of coke oven gas shall be determined on the premise that the targets of gas purification are ensured, the economy and stability of the purification apparatus operation should be taken overall consideration.
This paper introduces heat pump distillation technology for coal water, which uses absorption heat pump to recover the waste heat of ammonia vapor at top of ammonia stripper with circulating hot water as the carrier,and the circulating hot water heats the waste water from bottom of ammonia stripper through reboiler; the generated low\|pressure saturated steam returns to bottom of ammonia stripper to supply heat,which has reduced the energy consumption of ammonia stripping.
This paper introduces the problems, reasons and improvement measures of AAO process.The biochemical system could avoid impact using emergency regulating pond to homogenize the raw water; dose floating packings to the aerobic pond to prevent swelling of sludge; dose flocculant to the oil removal pond for effective removal of total cyanide.
A new coking coal drying technology was developed with reference of DAPS technology.By using of this technology,coal can be classified to three grain sizes-fine coal, medium coarse coal and coarse coal.Therefore pretreatment of coking coal became an integration of drying,briquetting and selective crushing.
Based on the carbonization and gasification features of Fushun furnace，material calculation for Xinjiang oil shale in Fushun carbonization furnace is carried out by comprehensive calculations.As a result，a general material calculation method is obtained for the carbonization process of oil shale in Fushun furnace.The calculation result by this method provides basis for production check，technology and equipment evaluation，control，analysis and measurement of material，understanding of process material distribution and selection and design of purification and delivery equipment.
In order to study the properties of coking coal at different grain sizes,Zhaogezhuang fat coal,Hailing 1/3 coking coal,Mucun coking coal and Sangei lean coal are screened by 10mm,5mm,3mm and 1mm screens.Coal quality analysis and coal petrography analysis are carried out for each individual coal at different grain sizes.Influence of coal kind and coal grade to coking coal property is studied,which provides certain theoretical basis for selective crushing process of individual coals.
This paper studies the influence of ash on the initial solution reaction temperature of coke after coke is added with different amount of ash through experiment.The initial solution reaction temperature of coke deceases with the increasing of ash.The initial solution reaction temperature decreases from 941.6℃ to 927.7℃ with the addition of ash content from 1.63% to 20%.Fe2O3，CaO and MgO work as catalyst to the solution reaction of coke，while SiO2 and Al2O3 has little influence to the solution reaction of coke.
This paper introduces the change of process and coke quality after modifying the 4.3m top charging coke oven battery to stamp charging. After the modification,the coke yield has almost remained same as before,while the coke strength at cold and hot conditions has increased,and the coke screening has been improved,the metallurgical coke rate could be increased by 2.5%,coke nut yield has been reduced by 1.5%,and coke breeze yield has been reduced by 0.5%.
This paper analyzes the reason for abnormal CDQ discharging temperature.Measures such as optimizing operation,treatment of floating coke,center and surrounding air ration adjustment and leakage prevention of the system are taken to control the discharging temperature in normal range.Therefore the production of CDQ system is stabilized.
This paper introduces the problems existing in the charging emission control system of top-charging coke oven.Reasons for those problems are analyzed and corresponding measures are put forward to effectively seal the charging hole.Smokeless coal charging technology for top-charging coke oven is introduced.It is proved to have good effect.
This paper proposes the process design of adding dedusting dust and sewage sludge in coke plant to coal blending process and analyzes the advantages and disadvantages as well as the economic benefit.On condition of stable coke quality,the method could increase the utilization value of dedusting dust in coke plant,and solve the problems of wastewater discharge and sewage sludge treatment in coke plant.
This paper introduces the technology of utilizing the waste heat of coke oven flue gas, and analyzes the technical and economical feasibility of this technology.With the application of one set of flue gas waste heat utilizing device, coke oven gas can be saved by 2 000m3/h, methanol production can be increased by 8 000t/a, and profit can be increased by 22 400 000RMB/a.
Regarding to the problems existing in the charging emission control system of top-charging coke oven,the de-dusting main and water tank are modified to compound box structure,and water seal type explosion proof device is replaced by oil type explosion proof device.The charging emission control effect is improved and running cost is reduced after improvement.
This paper introduces a 7m coke scraping device,which is mainly composed of steel structure platform,coke scraping unit and coke quenching & conveying unit.It has the advantages of simply structure,module assembly & disassembly and low cost,and it could safely and efficiently solve the problem of hard pushing in coke oven battery.
This paper studies the moving principle of the main drive system for multi-hammer stamping machine.The positive pressure change curve of cam group is obtained based on dynamic analysis.With the study of supporting features of the main axis,a new supporting form good for load-carrying of the system is designed,and the design of main axis is proved under various working conditions.
This paper comprehensively analyzes the reason for over high temperature of oven top space during production management and operation of coke oven battery,and provides relevant measures corresponding to some causes from the aspects of oven condition,operation and management.With the application of these measures,the average temperature of oven top space is reduced by 14~27℃ as expected.
Naphthalene content in coking naphthalene is determined by gas chromatography and area normalization method.The determination condition of capillary column gas chromatography and its precision and accuracy are fixed and proved through experiments.The result shows that capillary column gas chromatography has the advantages of high accuracy and less deviation, which is good for guiding the production.
The modification of the ground burner in methanol making device from coke oven gas has avoided overpressure in exhausted gaspipelines, and it also realizes full recovery of the leaked exhaust gas, which has increased the methanol yield.
This paper introduces the low-nitrogen combustion technology to control NOx generation in exhaust gas of coke oven battery and the denitration technology for exhaust gas,and it also elaborates the applicability of dry denitration and wet denitration method and the problems to be solved.
As the composition of coke plant wastewater is very complicated, it is very difficult for treatment. The main source of coke plant wastewater is ammonia stripping wastewater, and this paper uses hydrolysis method for removing the cyanide in coal water to reduce the cyanide content in ammonia stripping wastewater, so that the cyanide content in wastewater after treatment in wastewater treatment station could reach the required standard.
A new technology using salt extraction liquor instead of production water to prepare ammonium sulfate mother liquor was developed.The mixture of proportional salt extraction liquor and production water is used to prepare circulating spray mother liquor for ammonium sulfate system.Production water consumption and waste water treatment cost are reduced without influencing the quality of ammonium sulfate.Harmless reuse of salt extraction liquor is realized.
Head space gas chromatography was used to determine BTX content in crude benzol.The experiment proves that head space gas chromatography meets the requirement for BTX content analysis in coking crude benzol.This method can be used to guide production operation for it has the advantages of high precision and good repeatability.
This paper systematically analyzes the influencing factors based on production realities for the problem of blockage in ammonia stripper which has impacted stable operation of the system,and proposes optimization and modification for oil discharging in source liquor,alkali dosing mixer and feeding process for ammonia stripper,which has reduced the blockage of ammonia stripper trays and greatly improved the operation stability of the system. In addition,the NH3-N content in wastewater from ammonia stripping could be stably controlled within 100～200mg/L.
This paper introduces the three methods of reducing total cyanide concentration in coke plant wastewater.The test shows that the methods of coke absorption and flocculant dosing to oil removal tank are both effective.Coke absorption method will increase labor intensity,so it is not a good option; while the method of dosing flocculant to oil removal tank with self-pressure blowdown system could not only reduce the total cyanide concentration and also benefit the biochemical treatment process.
On condition of not changing the column body of original ammonia stripper and deacidifier,this paper presents the method of replacing original internals with new type vertical sieve trays,which has solved the problem of insufficient capacity and effect of ammonia stripping process.The capacity could be increased to 200~280m3/h from 133m3/h,and at the same time the parameters of ammonia stripping and deacidifier could meet the requirement of original design,so that it has achieved the effect of high yield with lower energy consumption.
This paper presents the method of utilizing the coking waste heat for winter heating, and the waste heat after winter heating is further supplied to vegetable greenhouse, which has recovered low quality heat energy and realized gradient utilization of heat energy.
The coking waste water after biochemical coagulation is pretreated by tube settling pond and 0.4~1.2mm shallow sand filter, and then deeply treated by fixed-bed resin absorption.The water after treatment meets the requirement of recycling.The concentrated liquid generated by the regeneration of resin absorption bed is sent to the biochemical unit after Fenton oxidation.
This paper introduces the physical and chemical characteristic and present application of bio-carbon,illustrates the application of bio-carbon in the fields of environment protection,soil restore and improvement,relief of energy crisis and so on,and points out its significance and development direction in the aspect of environment and energy crisis.
This paper introduces the structure features of Fushun type gas retort.Factors influencing the oil recovery are analyzed based on the running features of the existing gas retort.Measures to improve the oil recovery and production capacity are proposed，which has great significance to optimize the retort type and adjust oil recovery process，diagnose and confirm the main factors influencing the oil recovery，and especially improve the production output and efficiency.
The influence of moisture content in coal charge to the cold and hot strength and grain size is studied.This paper compares the difference of center temperature of coke cake from same dry coal but different coal cake height.The experiment result shows that as the moisture content reduces，the dry basis coke rate increases，but the shrinkage rate of coal cake decreases，the cold and hot strength of coke are improved，especially the coke strength after reaction is improved remarkably，the coke grain size decreases and uniformity of coke is getting better.Under the condition of same dry coal，temperature of coke cake at the center rises faster as the moisture content decreases.
The lid lifting mechanism for double U gas transfer car is a four-claw mechanical tong,which cannot accurately take,lift,lower down and locate the lid.As a result the de-dusting effect is affected.After C type tong is adopted for two gas transfer cars,the operation is more convenient and reliable,damage of equipment is eliminated,operation time is shorter,and the charging emission control effect is obviously improved.
This paper introduces the advancement and features of pushing control for SCP machine of 6.25m stamp-charging coke oven, analyzes the pause in front of oven and pushing process, pushing resistance and pushing current comparing with the conventional pushing process, and proposes a creative control method for step acceleration and constant pushing, by which the pushing process is optimized and pushing current is decreased. It is of great significance to protect coke oven proper and prolong the service life of coke oven.
The significance of on-line analysis of circulating gas of CDQ system is discussed.Take Wuhu CDQ project as an example,the circulating gas analysis system of SERVOMEX is introduced regarding to its structure,working principle,maintenance and instructions.Dry filtering sampling probe; Purging disc; Gas analyzer; CDQ; Circulating gas
This paper introduces the economic budget analysis for the technology of coal blending with coke breeze instead of lean coal.The investment budget is detailed from the aspect of coking technology so as to provide data and investment basis for the application of this technology.
This paper analyzes the problems existing in the traditional rotary sealing valve,and introduces the technical innovation and improvement of new rotary sealing valve.The new rotary sealing valve has the advantages of stable performance,less failure and longer service life,which is good for stabilizing production,increasing output and efficiency and energy saving.
This paper introduces the integrate casting on the corbel area and ring air duct of CDQ.The production target is satisfying.Air flow reaches 75,000m3/h,and the technical and economic indexes are normal.It is good for the stable operation of CDQ and prolonging the maintenance cycle.
This paper introduces the application of H fin sub-economizer in CDQ system.The H fin sub-economizer has the advantages of less dust accumulation,high abrasion resistance,less resistance to smoke and high heat exchange efficiency,so it has been widely adopted.
This paper analyzes the problems for fixing of oven door by oven door rotating maintenance device,and proposes a new method for fixation of oven door.With the simulation model of Solidworks,the force analysis of oven door under this new method is worked out.The feasibility of the new method is verified.The new method improves the force bearing condition of oven door and improves the safety and reliability of the device.
Coal blending quality,heating quality,carbon penetration,burning loss in CDQ and carbon powder adhesion are the main factors for the generation of immature coke.The proportion of immature coke can be remarkably reduced by optimizing the coal blending proportion,heating system and CDQ operation,so that the coke quality can be improved.
This paper introduces the main ideas for renovation and expansion of old coking plants.The general layout shall be designed with comprehensive consideration of short term and long term plan,less land occupation and comprehensive utilization of land.The general layout shall be scientific and feasible to minimize the cost,consumption and deviation.
To meet the process control requirement,renovation and improvement have been made on the actuator for coke oven heating,transmitter of heating control system,PC panel of automatic control system,computer table in the control room,level measurement device in quench basin,pressure regulating device for gas collecting main and the program for reversing machine.After renovation,the coke oven automatic control system runs properly,and the automation level of coke oven control is improved.
Regarding to the problems existed in the traditional gas condensate tank,the 5 water seals in the negative pressure area were renovated.U tube energy saving and environment protecting gas water seal was adopted.The waste heat of circulating ammonia liquor was utilized to insulate and flush the water seal.It has good energy saving and environment protecting effect.
The accuracy of automatic coal blending is affected by control algorithm,feeding system and the accuracy of weighing system.Based on the analysis of the affecting factors,methods and measures to improve coal blending accuracy are proposed.
A linear programming model of heat exchange network for distillation is established to quickly determine the optimal distillation flow structure and operation parameters with the smallest amount of public work (or cost) and simplify the synthesis of complex distillation system.Finally the feasibility of the mode is verified by examples.
The low temperature coal tar from Inner Mongolia was distillated effectively,and the distillate oil was separated to phenol oil and neutral oil through acid-base solution extraction.The chemical composition and structure of phenol oil and neutral oil were analyzed in a quantitative and qualitative way by GC-MS technology.The result shows that there are 40 kinds of compounds with mass fraction more than 0.1% in the phenol oil,mostly of which are phenol,alkyl phenol and naphthol; there are 104 kinds of compounds with mass fraction more than 0.1% in the neutral oil,mostly of which are alkene,alkane and naphthalene,etc..
This paper analyzes the problems existed in the packed columns and introduces the structure features and design principle of multi-layer distributor.With installation of multi-layer distributor,the mass transfer efficiency can be remarkably increased and the resistance of the column can be reduced.
Simulation calculation has been worked out for the primary tower and rectification tower of industrial naphthalene unit with the help of Aspen Plus chemical simulating software.Influence of process parameters to the product quality and energy consumption was studied.The production power consumption is reduced by optimizing the process parameters.
This paper introduces the anhydrous ammonia production process,analyzes the negative factors for production of anhydrous ammonia,proposes measures such as adding water cooling naphthalene washing device,improving the demister after desulfurization and strengthening the heat insulation of the system to optimize the production process of anhydrous ammonia.It provides reference for the new construction and renovation of anhydrous ammonia device in other similar plants.
Taking the experience of similar projects as example,by comprehensive analysis and comparison of various selection scheme for selection of process centrifugal compressor,this paper proposes a method for selection of compressor during engineering design.
LNG production from COG has become a new utilization of COG.This paper introduces the features of LNG,process flow of LNG production from COG and the applicable codes for general layout and transportation design.The key point for general layout is described in detail in this paper.
This paper introduces the design of FGS (fire & gas system) for LNG terminal taking Shanghai Gas Group Wuhaogou Expansion of the LNG Peak Shaving Plant Project as example.Simulation of emergency shows the importance of FGS system.
This paper probes into the pyrolysis kinetic characteristics of Zhundong coal and Shenmu coal with thermogravimetric analysis method and gas heat carrier experiment,and determines the kinetic parameters by established pyrolysis kinetic model.It finds that the impact of reaction residence time on semi\|coke yield and its volatile matter decreases with increasing pyrolysis temperature; the pyrolysis activation energies of coals are related to reaction residence time and coal particle size.The study results have great significance on industrialization of coal pyrolysis process.
This paper researches the high temperature metallurgical properties of coke used in blast furnace ironmaking process under lab conditions,and also elaborates the impact of alkali metal on the high temperature metallurgical properties of coke,so that it could provide basis for improvement of metallurgical coke quality for blast furnace and selection of ironmaking coke.
This paper conducts experimental coke making respectively by top charging and stamp charging method with 6 kinds of single coal and their 4 kinds of blended coal in 2kg test coke oven,and studies the impact on coke quality.The result shows that stamp charging has increased the bulk density and improved the caking property and further improved coke quality.On condition of ensuring the coke quality,more quantity of weakly caking coal such as gas coal,lean coal and meager coal could be blended.
This paper studies the vitrinite characteristics of similar rank coking coal through density centrifugation method to separate the macerals of coal petrography,and also analyzes and compares their caking property and the features of the produced coke. The study shows that there are differences in volatile matters,caking property and inert-tolerant capacity of similar rank coals,while the difference in inert-tolerant capacity of vitrinite of the coking coals is larger,and the property of the produced coke from similar rank coal vitritite also has obvious difference.Compared with the coke produced from raw coals,the optical texture index of coke made from vitrinite is higher,while the strength and reactivity of the coke become decreased.
This paper analyzes the causes for the problems of deduster including dew formation,frequent damage of gasket for dust cleaning valve,reduced service life of filter bag and partial smoldering etc.,and adopts countermeasures including using flap type steam bushing insulation device,adding pressure reducer at inlet of deduster air bag,properly increasing fan flow,reducing emission moisture etc.,which has effectively solved the problems.
This paper introduces the purpose,system composition,model establishment and system functions of the energy saving evaluation system for coal moisture control process,and also proposes the energy saving technical index for performance coefficient and energy efficiency coefficient as well as the economical index of dynamic recycling period,which has provided scientific evaluation for the coal moisture control process.
This paper introduces the mechanism of using binder and leaning agent in coking coal blending,and summarizes the improvement effect of binder and leaning agent on coke quality.Application of blending additives for coking could improve coke quality,and there is a broad prospect for its application in coke industry.
This paper introduces the practice of Ningbo Steel in applying plastic coal briquette technology. On condition of matching the coke quality requirement,the ratio of blended waste plastic in coking coal is increased,and the coke quality is stabilized on condition of limiting the blending ratio of waste plastic. The study provides theoretical basis and industrial reference in scientific,reasonable and economical control of “white pollution”.
This paper analyzes the broken tubes of secondary superheater by Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS) and found that the high temperature sulfur corrosion is the main reason for the tube damage and further tube burst.After corresponding improvement, there is no more tube burst accident.
Experiment was carried out to study the methods of thinning the existing oven door brick and reducing heat loss on the surface of oven door.The result shows that if the oven door brick is thinned by 80mm and installed with an additional new type high temperature resistant insulating plate,maintenance of oven door is easier, heat loss on the surface of oven door is less,effective volume of coking chamber is increased and consequently coke output is increased.The thinned brick can meet the requirement of oven door.
This paper introduces the method and device for recycling the steam exhaust of deaerator. It applies membrane type condenser recycling device for recovery of the steam exhaust heat and condensate, which has realized cycling utilization of the heat and saved low pressure steam consumption,and there is significant economic benefit.
This paper introduces a determination method for waste gas circulation flow of coke oven battery.It has successfully determined the waste gas circulation flow on 7m coke oven battery respectively heated with coke oven gas and mixed gas,and the determination results show that the waste gas circulation flow is higher when heated with coke oven gas than mixed gas.
According to the characteristics curve of the pressure control valve on gas main pipe,this paper establishes a mathematical model of variables of pressure control valve.On that basis,step disturbance of the system is removed with feed-forward control method according to the characteristic of control valve and process requirement of coke oven heating system,so that the pressure of recycled gas main pipe could be stabilized at the prescribed value,and the system has been well operated at site.
This paper proposes the improvement methods based on analysis of the causes for malfunction of limit signal transmission device for coke bucket gate. The improved transmission device has removed the horizontal component force on the transmission rod and reduced frictional resistance, and the operational reliability of the device has been improved.
This paper analyzes the features of SO2 contained in coke pushing emissions and proposes the semidry desulfurization process with Na2CO3 as the desulfurizing agent for coke pushing emissions,and also elaborates the application of this technology in coke pushing dedusting system.
This paper analyzes the factors that impact the cost and efficiency of vacuum carbonate desulfurization process, and accordingly adopts corresponding improvement measures. After improvement, the desulfurization cost for coke oven gas has been reduced, and the desulfurization efficiency is improved, which has achieved the expected purpose.
This paper introduces the current status of desulfurization process for deep purification of coke oven gas. Against the evolved problems,this paper proposes process optimization and technical modification methods which has reduced system resistance and increased desulfurization efficiency,and has reduced cost up to 4 million yuan/a.
This paper proposes improvement method for sulfur foam treatment technology against the problems of high moisture in sulfur paste,serious spillage of desulfurization solution,blockage in discharge outlet and difficulty in repair.The improvement has achieved good effect,including improvement in site environment and sulfur paste quality,obvious reduction in production cost and labor strength.
Hydraulic test has been carried out for the new type packing,the result of which shows that the packing has features of high throughput and low pressure drop.Its application in gas sulfur removal unit brings out higher desulfurization efficiency and good anti\|clogging performance.
This paper establishes a separation and determination method for o-cresol,m-cresol and p-cresol with capillary gas chromatography.The peak area and concentration of o-cresol and m-cresol have linear relationship in the range of 2～200g/L,and the relative standard deviation is respectively 1.84% and 1.67%; the same of p-cresol has linear relationship in the range of 2～200g/L,and the relative standard deviation is 1.63%.The determined recovery rate of them are all between 96.4%～103.8%.
This paper introduces the calculation of fire separation distance between the flare and equipment in coking plant.First the horizontal distance between the point which subjects to the strongest flame heat radiation and the center of flare shaft,based on which the fire separation distance between the flare and equipment can be worked out.This provides design basis for the reasonable arrangement of these two units to avoid damage of equipment caused by heat radiation of the flare.
Based on analysis of the contents of waste gas from tar processing,this paper proposes methods including increasing wash oil cooler and changing baffle plates with packings to improve the recovery rate of waste gas; the unabsorbed waste gas will be sent by fan to the heating furnace for combustion so that the gas emission meet standard requirement.The method could remove off-odour and greatly improve operation environment at site.
This paper has made attempts to successfully solve the problem of low spray atomization of ammonia liquor and smoke emission during coal leveling through modifying the length,outlet diameter,spray angle and spray pressure of the ammonia liquor spray nozzle. After applying the new nozzle,the pressure at the spray nozzle has been reduced from 3.5MPa to 2.5MPa,which has created annual economic benefit of 1.2 million yuan.
The coal blending expert system is established based on the coke quality prediction module and coal blending ratio optimization ratio.It includes such functional modules as data collection，data storage，knowledge base and inference engine，etc..It can predict the dust content，sulfur content，M40，M10，CRI，CSR of coke，and rapidly work out the best coal blending ratio.The practical application showed that the foreseeing deviation of coke quality is less than 6%，which meets the production requirement.
Application scheme of high quality low price coking coal is determined through pilot coke oven test.The scheme is finally applied in coking industry,so that the high quality low price coking coal can be used in an innovative way,and the resources of coking coal is widened.The cost for producing coke is greatly reduced under the precondition that coke quality is stabilized.
Environmental problems during coking production of Masteel coke oven battery are described.Dust is collected through the methods of coke screening for battery No.1~4,optimizing CDQ de-dusting,technical improvement on pushing de-dusting of 7.63m coke oven battery,and construction of 3 stationary bag house stations for charging and pushing of battery No.5~6.In addition,measures such as strengthening the maintenance and management of aged ovens,using new glazed refractory and improvement on knife edge can effectively minimize the leakage of intermittent smoke.
Study on the flow and heat transfer process shows that the zero pressure level of CDQ system is located in the corbel zone,so the distribution of gas flow in the cooling chamber is not only related to the voidage of moving coke bed,but also related to the layout of regulating bricks at the outlet of corbel zone and negative pressure.Heat transfer between gas and coke in CDQ chamber can be enhanced by prolonging the stay of carrier gas in high temperature area and improving the gas flow distribution between the carrier gas and coke in the low temperature area.
Study and improvement have been carried out regarding to the problems found during operation of CDQ discharging device.After improvement,failure of the equipment is reduced,and the running stability of the system is improved greatly.The production requirement can be met.This paper provides technical reference for the reliable and stable running of similar process equipment.
Regarding to the problem of low temperature at oven end in case of prolonged coking time,the technology of supplementary heating of end flues is adopted to maintain the temperature of oven end ≥1 100℃.As a result,the production environment of coke oven battery is improved,and consumption of heating gas is reduced.
Regarding to the problems of coke oven proper such as denudation of oven wall,gap between oven bricks,crack on the crossover bricks,chopping and damage of bottom bricks,unroofing renovation technique is adopted to repair coke oven battery under hot state.The result is good and the coke oven battery after repair is in normal operation.The application of this technique in Jiusteel has reference significance for other coking plants.
This paper studies the influence of thin oven wall of 6m coke oven battery to coke oven proper strength,coking time,coke output and power consumption.For coke oven battery with thin oven wall,after careful calculation and with suitable measures adopted,coke output can be maintained,and at the same time,gas consumption and environment pollution are reduced.
The automatic temperature measuring system is improved after analyzing the problems in the control process and taking such measures as line protection，temperature deviation treatment and compensation，etc..As a result，online monitoring by computer can be ensured and automatic temperature measuring system in heating up of 7m coke oven battery is realized.
This paper introduces the application of automatic monitoring method in the fields of online monitoring of toxic，harmful and combustible gas，automatic recording of pushing，infrared thermometry and counting of stamping hammers.Good results have been achieved and the automation level of production is improved.
Based on the automatic detection of vertical flue temperature，net coking temperature judgment and coke cake temperature monitoring，an automatically optimized heating control system for coke oven battery is established.Through optimized control，the heating gas can be regulated timely to maintain stable oven temperature.Meanwhile，it helps to control the maturity of coke，improve coke quality and timely discover the abnormal oven.As a result，the automation level and stability of coke oven are improved.
The automatic measurement system for coke cake center temperature installed on the coke guide car can reflect the maturity of coke cake timely.Application of this system reduces energy consumption，labor intensity and ensures safety.
CARMA is adopted for modeling the relationship between the valve location and pressure of single gas collecting main.Model order can be determined by adopting modeling principle with large information entropy.Parameter estimation is carried out taking minimizing the quadratic sum of deviation values actual value and calculated value as objective function，so as to identify the model of gas collecting main.The comparison result between predicted pressure and actual pressure proves the effectiveness of CARMA in the control of gas collecting main pressure.
This paper analyzes three benzol production processes. Through comparison it can be seen that negative pressure debenzolization process with steam has lots of advantages,such as improving the efficiency of debenzolization tower,reducing emission of SO2,preventing blockage of equipment and reducing operation cost,and so on.
Through analysis of the features of coke oven flue gas,this paper proposes a kind of integrated process for desulfurization,dedusting,denitration and thermal decompositioin of coke oven flue gas,and expounds the system composition and characteristics of the process.Analysis and comparison shows that this process has advantages of simple system,compact workflow,easy operation and less maintenance,which could effectively solve the removal problem of SO2 and NOx in coke oven flue gas.
This paper studies the influence of reaction temperature,reaction pressure and reaction time on the content of mesophase in modified pitch.The experiment result shows that the content of mesophase increases along with the increasing of reaction temperature and pressure and reaches maximum at 0.22MPa,and increases as reaction time lasts and reaches maximum at 8h.Under suitable condition,modified pitch containing 1.22% mesophase can be obtained.
This paper analyzes the reason for the problems existed in the BTX extraction and distillation process of crude benzol hydro-refining plant and proposes appropriate renovation methods.The plant runs well after renovation,and the problem of solvent inactivation is solved.
This paper introduces HPF desulfurization and vacuum potassium carbonate desulfurization and compares the advantages and disadvantages of these two processes.Analysis shows that HPF desulfurization has the advantages of low investment,simple operation,but it has the disadvantages of high operation cost,low quality sulfur produced,large amount of waste water generated and serious pollution problem; while vacuum potassium carbonate desulfurization needs higher investment,is complex in process,but it cost less for operation and the product sulfuric acid can be directly used for ammonia recovery.
This paper introduces the process of heating with coke oven gas and purge gas.The influence of purge gas is analyzed,and the result shows that mixed with purge gas,vertical heating of coke oven is improved,temperature fluctuation in the coking chamber is reduced,labor intensity is reduced,pressure of main pipe in the cellar is increased,the longitudinal temperature meets the specified temperature,and there is no affect to the suction force of flue,formation of graphite or pushing.Therefore,this process brings remarkable economic benefit.
This paper introduces the upgrading process of traditional intermittent gasification into rich oxygen continuous gasification,discusses the problems existed during running and corresponding solutions.Rich oxygen gasification process has the advantages of less investment,simple operation and less pollution.
This paper introduces the process flow and feature of sulfuric acid making process with low quality sulfur and desulfurization waste water,and analyzes main parameters such as technical and economical indexes,emission indexes and environment protection indexes.By this process,the problems existed in the recovery of low quality sulfur and in the treatment of by\|product salt solution of desulfurization are fundamentally solved,the efficiency of desulfurization and cyanide removal from COG is effectively improved,discharge of waste is reduced and the environmental protection level is increased.
To meet the requirement of Emission Standard of Pollutants for Coking Chemical Industry GB 16171—2012 on emissions discharged to the atmosphere,upgrading measures are taken for ammonium sulfate unit,including improvement on production system switching and waste gas washing and purification unit.After upgrading,the ammonia and particle contained in the waste gas are lower than the limit value specified in the new standard.
ISSN 1001-3709 CN 21-1164/TQ Sponsor:ACRE Coking & Refractory Engineering Consulting Corporation,MCC Postal Code:8-28
