The technology of coke oven pressure regulation is the new technology for environmental protection which has been adopted in large coke ovens.Development background for CPS and PROven of technologies of coke oven pressure regulation applied in coke oven projects of China is introduced in this paper.Meanwhile based on analysis and comparing of working principle and technical philosophy of the technologies,the paper evaluates their function effect and applicability and raises the point of view that CPS technology is the technology more applicable for Chinese situation.
This paper introduces PSA process and its technical problems.By the process,the content of carbon is extracted from LDG and BFG.The process improves productivity of existing device for methanol synthesis from COG to make full use of energy sources and increase added value of products.
This paper introduces the priciple of waste heat recovery technology of HYWHR type coking waste gas,features of its equipment structure as well as running effect,and summarizes advantages and reliabilities of the process in energy conservation and emission reduction.
The caking index is an important parameter to evaluate caking and coking property of coal.Through analyzing factors such as coal property and methods of sampling,preparation and testing,this paper manages to regulate testing process and ensure data accuracy.
Influencing factors of coke collapse in oven end on coke side for 7.63m coke oven have been found in some aspects such as the index of charging coal,the temperature of coke oven,the running of PROven system as well as the production of coke oven.Countermeasures are taken so as to release the serious problem and the number of ovens as well as amount of collapsing coke is substantially reduced,which also cut down on manpower.
This paper studies drying properties of coking coal and index of coal quality under the influence of microwave drying technology.The dehydration rate of coking coal sample can be increased by microwave，namely，bigger rate of microwave has faster drying，while the influence of the microwave power on caking of coking coal is decreased，bigger power and less influence.The microwave dewatering technology can be used in drying coking coal，which can save report time.
For the problems in CDQ running,this paper analyses main influencing factors,meanwhile,some improved measures are proposed.After improvement,the CDQ system of stamp-charging coke oven has been running stably,which dry quenching rate has reached 93.49%.
The position of pusher rod where maximum stress can be sustained is found out by stress analysis during the process of coke pushing so that the maximum pushing force of pusher rod is calculated and intensity also can be checked.Design proposal of structural optimization is proposed according to the analysis on shape of cross setion of pusher rod.Simulated forced analysis of pusher rod is done after optimization.
The application of energy saving charging hole lid on coke oven battery in replacement of traditional charging hole lid is introduced. The energy saving charging hole lid can reduce the temperature on the surface of charging hole lid and the radiation temperature on the top of coke oven,which improves the operation condition on the oven top and realizes the target of energy saving and consumption reduction.
Working principle of oven door maintenance vehicle and kinds of problems occurred during its using are introduced.This paper analyses and solves a series of technical difficulties such as the mode of power supplying,safety and stability of travelling and lifting mechanisms,which improves the safety,neatness and efficiency of operation of coke oven.
Application of net coking management for 7m coke oven is discussed.Compared with conventional heating system which simply depends on experienced data，net coking management，as a heating assistant can not only save energy consumption of coke oven，but also as early as possible discover and prevent from accidents，stabilizing the temperature of coke oven and realizing long life.
Basic principle and process of PDCA cycle is introduced and its application in coke & by-products production is expatiated.Analysis of factors influencing coke’s CSR during production is made by PDCA cycle.By main reason confirmation and corrective measures implementation,the index of CSR is improved.
This paper introduces the changover process from BFG heating to COG heating for some combustion chambers when oven walls of the chambers are repairing.Partial changeover can ensure the temperature of coke oven stable and even so as to improve the operation’s efficiency and safe.
This paper studies the changes of QI and TI of coal tar pitch from different origins during thermal conversion under specified pressure and temperature, based on which reasonable process parameters can be finalized to produce high quality needle coke.
The principle,process and devices of ammonia flue gas desulphurization is introduced.The problems existed are analyzed and corresponding measures are taken,which makes the operation of desulphurization stabilize and tail gas reach GB Standard.
In order to make full use of tail gas, methanol is synthesized from tail gas after modification, which improves the conversion efficiency of COG and economic benefit.
This paper discussed properties of refined asphalt and influence of delayed coking process on needle coke.The result shows that high qulaity needle coke is produced under conditions of delayed coking with 450℃,0.5MPa and more than 20 hours.
The principle of WSA process is narrated and determination methods of air consumption are discussed.Theoretical bases are provided for controlling air consumption.Attentions to be paid in design is proposed according to WSA unit of Zhanjiang Iron & Steel Company.
During treatment of coking waste water,there are a lot of problems such as too much waste water needs to be treated.After improvement of technology,optimizing of process,sorting of waste water,handling by classification,the amount of waste water decreases by 25t/h.Solvent extraction dephenolization system has been shut down,which is based on the qualified water after treatment,so as to improve the quality of ammonia liquor and reduce the cost of waste water treatment.
In order to tackle with the problem of long-term over-load of gas exhausters,the capacity of gas exhauster was expanded to eliminate potential danger and ensure auto adjustment of the pressure of gas collecting mains.
This paper introduces the efficient and energy-saving technique of surplus ammonia waterdistillation.The application of process and equipment optimization and utilization of absorption heat pumps improve concentration of ammonia water product and reduce total ammonia content in waste water.
The reason for the formation of blockage is analyzed based on the inspection of the crude benzolscrubber and test of greasy stain,and corresponding measures are taken.The method of cleaning with chemical agents is effective.The resistance of the crude benzol scrubber is reduced by 2 500Pa,and the recovery rate of crude benzol is increased by 0.15%.
This paper analyzes the sources and emission concentration of SO2 and NOx in coke oven flue gas,discusses the measures to control the emission of SO2 and NOx and introduces mostly studied technologies of coke oven flue gas treatment at present. For the enterprises which are difficult to meet the emission standard requirement by strengthening the management,end treatment technology shall be adopted to make coke oven gas emission meet the requirements of national emission standards.
Present situation and development of anthraquinone production technology
This paper introduces the production technology of anthraquinone,compares the production methods of anthraquinone,analyzes the development situation of anthraquinone production in China and discusses the future development of anthraquinone market in China.
This paper provides an effective method to control the collapse of coke cake by studying and analyzing the influence of key index of blending coal on stability of coke cake.
This paper analyzes the causes of the emission discharged from 7m coke oven battery,introduces emission control measures during coal charging and pushing.Meanwhile,part of the existing facilities are improved to improve the efficiency of emission control.
Combining with the engineering example,this paper introduces the principle and method of steam-drive device selected by coking plant.Steam drive can save costs,reduce energy consumption,improve the efficiency of energy use,and has more advantages than electric drive.
This paper explains the damage reason of the water seal pot and the improving method of automatic cleaning.Automatic cleaning can be achieved after improvement，which can solve the problem of water seal pot fine coke cleaning，reduce labor intensity，and prolong the service life of the water seal pot.
This paper analyzes the different types of online repair methods of CDQ expansion joint which can avoid the losses caused by shut down,ensure the system sealing effect under normal pressure condition and provide guarantee for the stable production of CDQ system.
This paper analyzes the commonly used protection mode of belt conveyor in coking enterprises, proposes the method of unattended operation, and optimizes the start and stop control scheme of belt conveyor.
In order to overcome shortcomings of 6m coke oven frame cleaning device，this paper proposes the optimization and improvement measures and introduces the structure，characteristics and application of new door frame cleaning device.
The fuzzy control system of coke oven collecting main pressure is developed by using STEP7+WinCC based on SIEMENS S7-300PLC,which solves the interference problem between quick response and multiple batteries collecting main pressure coupling.This system was proved effective in practice.
Application of online temperature measurement and automatic heating technology for vertical flue
In order to overcome shortcomings of traditional method for measuring longitudinal temperature,regulating gas flow rate and flue suction by manual measurement,this paper introduces the vertical flue on-line temperature measurement and automatic heating system.The equipment are improved based on actual production.As a result, the stability of longitudinal temperature is improved,and gas consumption is reduced.
This paper proposes a closed loop control model of auto coal blending，coke oven heating and manless operation coking vehicles under the framework of ERP.Integration control shall be adopted for the upper and lower levels of these control model to realize full intelligent control system for coking production.
This paper studies the correlation between T5 temperature of CDQ and coke oven heating schedule.The results show that the CDQ running condition is good and each parameter index is stable by reasonable controlling of coke oven heating schedule to maintain the T5 temperature of CDQ chamber within a certain range，which is good to extend the life of CDQ.
This paper introduces the manufacturing process,mechanical properties and welding requirements of clad steel plate,compares the economical efficiency of stainless steel and clad steel plate.The application of clad steel plate in the coking industry can not only meet the design requirements,but also ensure the continuous and stable operation of the equipment.Meanwhile,non-ferrous metal resources can be saved.
This paper introduces the feasibility study and production practice of discharging PDS wet desulphurization effluent to the sintering plant for ore blending.That desulfurization effluent used for sintering ore blending provides a guarantee for the normal operation of coke oven gas wet desulfu\|rization system，reduces the investment and operation cost of the salt extraction equipment.Good economic benefit is obtained.
Since the production of benzene hydrogenation process,the content of benzene in non-aromatic fraction has been always high,resulting in a large loss of benzene.The content of benzene in non-aromatic fraction is reduced after analyzing the reasons and taking corresponding measures.
This paper introduces the treatment method of the desulfurization wastewater.Theammo-nium salt is extracted from the wastewater through decolorization，concentration and crystallization.The products can be used as chemical feedstocks after further oxidation reaction，and the clear liquid can be recycled.No waste is discharged.
This paper analyzes the principle and features of SCOT process and calcium desulfurization technology.Investment and running cost can be saved by adopting Claus unit tail gas calcium desulfurization,which could meet the requirement of production needs and environmental protection.
For extraction of crude quinoline process，the effect of pickling directly affects the yield and quality of the product.In the analysis of quinoline sulfate，there are many interference factors in determination of free acid.The experimental analysis is more stable.Washing efficiency and product yield are improved after improvement of the original method.
This paper analyzes the reasons of ETP auto-trip.The problem of false high oxygen content in gas can be solved and the normal operation of ETP can be ensured by improving the sampling facilities and optimizing sampling operation of oxygen analyzer.
This paper introduces the coal tar distillation process with a single set of processing capacity of 500 thousand t/a，for the aspects of heat conduction oil heat transfer，vacuum distillation and large volume tubular furnace.This paper analyzes and applies the energy cascade utilization，the centralized processing and the large-scale equipment，which improves the energy utilization ratio and reduces energy consumption of tar processing.
This paper explains the basic features and treatment difficulties of semi-coke waste water and introduces pre-treatment of feedstock ammonia,treatment of deamination and dephenolization,pre-treatment of distilled ammonia waste water,biochemical treatment,post treatment and advanced treatment technology.By adopting the above treatment technology,the treated water quality can meet the national discharge standard.
This paper introduces the corrosion condition caused by ammonium sulfate mother liquor and reasons for the corrosion of 316L stainless steel pipe, analyzes the features of glass lined pipe, steel framed polyethylene plastic pipe and polyethylene lined steel pipe, and service condition in the production of ammonium sulfate.Steel framed polyethylene plastic pipe is the ideal material according to the comparison.
This paper introduces the excepted working life of CDQ under existing condition and a series of techniques for its life prolongation.Application of the techniques can get away from frequently maintenance or shutdown so that the environment\|friendly CDQ system are featured with economic benefits.
This paper introduces main influencing factors,improvement measures and practical application of amounts of charging coal in single oven for 7.63m coke oven.Enhancing volume and density can increase amounts of charging coal with 1.25t for single oven,which is equal to 105400 tons per year in addition for the single oven.It also can be reduced pollutant emission.
The influence of CDQ chamber level，gas coke ratio，circulating air flow and material stay time to the average grain size of coke before and after change of CDQ operation mode was studied.Countermeasures were taken to optimize the production.After optimization，the coke grain size was stable and improved，and gas yield was increased，while power consumption was reduced.
The development trend and problems of large centralized de-dusting system are introduced.It is proposed that constant pressure value can be used to control the designed flow.The constant pressure can be controlled with the help of pressure sensors and valve positioning actuator.The test run air flow can be adjusted by programmable control.Therefore,the system resistance can be balanced during start-up,commissioning and operation,and consequently the de-dusting effect is satisfying.
This paper analyses advantages and disadvantages of disc type and cock type of heating exchange from aspects such as process,device,operation and economy in order to design a scientific heating exchange system with mixed gas,which provides a reference for consumers and designers.
Data processing module of coke cake center temperature measured by infrared radiation thermometer is devised and developed based on coke oven heating management and measuring standard of coke cake center,which provides a reference for the industry.
This paper analyses reasons for uneven compressing of expansion joint on CDQ boiler and cracks on H steel of economizer.Solutions are provided for relevant enterprises’reference from aspects of equipment, construction and running.
This paper introduces the application of oven door service lift in production of JNX70-2 coke oven and describes its working principle and structural features.Using of the lift resolves difficulties like online maintenance both on pusher and coke side and seal of oven door.It improves efficiency of maintenance and reduces intensity of labor.
The operation of CDQ is optimized and thermal efficiency is improved to maximize steam production rate per ton of coke by adjusting amounts of air,reducing heat loss and optimizing the ratio of air and coke,according to existing conditions of CDQ device in Linhuan Coking Plant.
This paper analyses the reason why temperatures of T3 & T4 on the same section are uneven in CDQ chamber and provides with corresponding handling measures for reference for solving similar problems.After the measures is adopted, the operation of CDQ become stable.
This paper introduces a method of determining revolutions of coal leveling and a standardized procedure for coordination between machinery. After application of a new technique in the production of coke oven,systems work stably to increase quality and yield of cokes,prolong working lives of equipment and ensure that the production runs smoothly and well.
This paper introduces control method of pushing rod motion and its maintenance experience combining practical cases,which provides a valuable reference for realizing safe and stable running of coke oven and improving automation level of its movable machines.
The automatic coal blending system with integrated storage and blending is introduced.The whole system is monitored and controlled by computer.Individual coals are blended in specified proportion accurately，so that the system runs stably and the blending accuracy is higher than 95%.Factors influencing the blending accuracy are analyzed，based on which necessary improvement measures are proposed.
Common faults of coke guide grid is analyzed based on practical applications.The grid is optimized from stages of design,installation and maintenance.Solutions are provided to decrease the fault and lower the rate of failure.
In this paper,the current situation of the pollution from coke side oven end emission of 6m top-charge battery is introduced together with its control measures; technical descriptions are also given,such as the new suction hood configuration and structure,emission volume and dedusting station parameters.
Combining project cases of coke oven flue gas purification,this paper compares two de-NOx processes,namely,direct de-NOx and de-NOx after semi-dry desulfurization.Both have their advan-tages and disadvantages,so carefully select them according to actual conditions of flue gas.
Solid base was used as catalyst for synthesizing 9-fluorene methanol by “one step method”.The effect of main factors to the yield of product was studied.The mixture solvent of toluene and cyclohexane can improve the purity of the product to 95% and higher,and the yield of the product to 40% and higher.
Four catalystsare selected to prepare O-Phenylphenol (OPP) by dibenzofuran hydrogenation.The optimium temperature,pressure and air speed are determined for hydrogenation reaction,and the optimal catalyst is determined.The optimium conditions for dibenzofuran hydrogenation are:center reaction temperature 430℃,reaction pressure 2.0MPa,mass air speed 0.05h-1.GC is adopted for qualitative and quantitative analysis of the products.Recovery rate of OPP is 60.03%,and BP is 34.27%.The conversion rate of DBF is up to 97.76%.
Renovation and running of the ignition control system of crude benzol tube furnace
The renovation and running of the ignition control system of crude benzol tube furnace is introduced. The ignition control system of the tube furnace has the function of ignition automatic control， realtime measurement of flame and flameout protection. It has the advantages of high automation level， good safety performance and stable running.
This paper introduces a testing method for determination of industrial acenaphthene content by gas chromatography.The method has many strong points such as easy operation, rapid analysis,wide range,good repetition and high accuracy.
The features of rubber membrane sealed gas holder are introduced.The gas holders with capacity of 50 000m3 of wet type，thin oil sealed type and rubber membrane sealed type are compared.The rubber membrane sealed gas holder has the advantages of suitable structure，low power consumption and easy management，so it has broad application prospect in coking industry.
The formation of foam during aerobic period in the biological treatment process of coking wastewater can be controlled by improving the quality of inlet water，stabilization of temperature in aerobic tank at 30~32℃，keeping the concentration of dissolved oxygen between 3mg/L and 4mg/L，and increasing properly the proportion of returned sludge.
Measures to reduce power consumption are proposed based on the analysis of high back pressure heating technology.Feasibility and reliability study on the technologies of air cooling turbine，wet cooling and high back pressure heating are carried out.Key points to be paid attention to are pointed out.The study showed that high back pressure heating unit with air cooling turbine is more preferable.
The tar,crude benzene and residual ammonia produced in the coking process need to be stored in a large tank to send the subsequent device processing device.In this paper,the research and application of the waste gas composition and collection method of the storage tank can effectively improve the VOC govern level of the coking industry.
Analysis on foam extinguishing and water cooling system of oil depot
This paper clarifies design essentials and basis of foam extinguishing and water cooling system of oil depot tankers in coking plant by analysis of the relevant provisions of Code for fire protection design of buildings GB 50016—2014,Technical code for fire protection water supply and hydrant systems GB 50974—2014,Fire prevention code of petrochemical enterprise design GB 50160—2008,Technical code for water spray fire protection systems GB 50219—2014,Code for design of foam extinguishing systems GB 50151—2010 and Code for design of automatic fire alarm system GB50116—2013.
It analyzes density,porosity,reactivity and micro-structure etc.of stamp-charged coke and top-charged coke,concluding stamp-charged coke is of high apparent porosity and density.Alkali metal functions as catalyst in coke loss reaction and it is more catalytic for stamp-charged coke than for top-charged coke.
This paper introduces the process and characteristics of the existing coking process and analyses the influence of crushing,briquette coal,coal moisture control (CMC) and coke dry quenching (CDQ) process on improvement of coke quality from the perspective of laboratory and industrial production,which provide technical references for the future coking production and process selection.
This paper describes the background,purpose and performance of adopting coal blending based on specific coal mines.By selecting specific coal mines and managing coal batch,7m coke oven production based on specific coal mines can be realized so that coke quality can be stabilized and high quality coke can be produced for large capacity blast furnace production.
Reasons for the collapsing of coal cake are analyzed in the aspects of coal blending，stamping，charging and maintenance.Coal charging process is improved and optimized according to actural situation.Ratio of successful coal cake is improved，and collapsing of coal cake is greatly reduced.
It discusses factors influencing SO2 online monitoring at chimney of JN60-6 6m coke oven battery and generalizes analytical methods and preventive measures on failure of meeting standards regarding those factors.
Regarding the problems of CDQ circulating cooling water such as pollution of makeup water，poor drainage of waste water and ineffective side filtration device，correct routine operation of circulating cooling water and reasonable making up and discharging measures are taken，so the volume concentration is effectively controlled.The discharged waste water can meet the requirements stipulated in GB 50050—2007 and can be properly recycled.
This paper analyzes the reasons of individual corbel zone blockage of No.2 coke oven of Bayi Steel Coking Plant. Starting from the bottom of vertical flue,by using the method of digging and repairing of coking chamber wall to open blocked corbel area,which could improve the heating uniformity and prolong the service life of coke oven.
This paper introduces steel rope replacing for CDQ system.The optimized maintenance solution enables a rational annual maintenance schedule for the CDQ system,which minimizes the replacement time,extends the annual maintenance intervals at most and ensures a safe production in the long run.
This paper introduces a technical process of waste heat recovery system from coke oven ascension pipes and proposes a solution to the problems such as ascension pipe leakage，inner wall carbonization，low efficiency in heat exchanging between gas and liquid phase，etc..The upgraded system after commissioning runs good with remarkable results in terms of energy saving and environmental protection.
Comparisons are made among different proposals and different investments for foundation treatment in large-scale backfill for civil work of coking plant. A rational method for foundation treatment is selected for speeding up construction progress and saving construction investment.
In view of repairing difficulties of easily damaged large expansion joint of CDQ primary dust collector and boiler during production,targeted improvements are made to simplify the expansion joint structure and improve its maintainability,thereby prolonging the service life of the expansion joint.
In view of the cleaning difficulty and incomplete cleaning of raw gas pipeline bottom sediment，a new type of cleaning tool for gas pipeline is designed，combined with flushing of high pressure ammonia water，which can enlarge the cleaning range，effectively shorten the cleaning time，improve the cleaning efficiency and reduce the labor intensity of cleaning.
It studies dedusting system of top-charging coke oven battery in aspects of safety and typical charging de-dusting accident to improve safety design and raise awareness of safe operation.It aims to tackle high risk of charging dedusting operation by taking preventive measures.
Main source of error and its control for light benzene end point measurement by distillation method
Light benzene end point measurement by distillation method is an official measurement as per Chinese national standard, during which errors would occur and the test result would be inaccurate.This paper analyzes the testing details and finds out the source of errors and puts forward a solution to minimize the errors.
Several technologies for secondary treatment of cokemaking waste water are analyzed in this paper that the double membrane method is considered suitable for current plant operation.Its advantages and disadvantages are also introduced in the process of cokemaking waste water treatment.Practical experiences are generalized for further development.
Regarding the problems found during operation of the vacuum potash carbonate desulfurization system，countermeasures are taken based on analysis and calculation. As a result the content of H2S after desulfurization column is reduced.
According to the analysis of benzol scrubbing process,the main factors influencing the scrubbing efficiency are found out.For the problems of high benzol content after the scrubber,low benzol content in rich oil and low spray density,an additional circulating stage of semi-rich oil is provided in the benzol scrubber.The problem of high gas temperature at downstream of the scrubber is solved by adjusting the chilled water quantity and establishing regular cleaning rule for the cooler.
It is analyzed in this paper that the blackening of vacuum potassium carbonate desulfurization liquid resulted from excessive high content of ammonia in gas.A solution is proposed that a buffer tank is installed by the desulfurization column for changing the blackened desulfurization liquid and controlling the ammonia content at the gas inlet which could effectively solve the problem and stabilize production.
In this paper, the method of managing heavy phase sediment is introduced, recycling sediment can not only reduce production cost and increase economic benefit, but could solve environmental pollution as well.
The problems of the coking waste water circulation system are introduced. By taking measures such as optimization of technological process and replacement of pipes and dehydrator, the coking waste water can be recycled in closed circulation to realize zero liquid discharge, while the sludge will be entirely sent to the coal blending system for coal blending and coking. Such upgradation reduces energy consumption and recycles resources.
Fenton oxidation process is used for the advanced treatment of coking waste water.After treatment,the indexes of the waste water are as follows: COD:60～70mg/L,ammonia nitrogen <5mg/L,suspended matter:15～30mg/L.The quality of discharged water meets the requirements stipulated in national standard GB16171—2012 Emission standard of pollutants for coking chemical industry.
This paper studies the nature and behaviors of micro organisms’ cultivation and breeding by SH-A process during coking waste water treatment.It also analyzes the influences to the micro organism growing,such as cultivation time,temperature,pH value,dissolved oxygen,etc.,which provides applicable conditions for nitrous acid growing in biological denitrification.
An integrated technology of CMC with classification is introduced in this paper and the behaviors of the CMC are also studied.The result shows that different sizes of coal after 3~5 seconds moisture removal can meet the requirement for cokemaking.A 2t/h pilot test is also conducted; its result demonstrates that under the pilot test condition,the raw coal was classified into fine coal and coarse coal at cut\|off particle size of 1.5mm,with moisture reduction by 1%~9%.The pilot test result not only shows the correctness of fundamental study and the technical feasibility,but also provides a technical support for an industrial application.
In this paper several processes for coking coal drying are compared based on energy price and capital investment, which can be used as guideline of decision-making for CMC projects.
Through analyzing on the coals for cokemaking in Xinjiang Tianyuan Coking Plant and by comparing with the coals outside Xinjiang，it can be concluded that coals produced in Xinjiang show the following properties，such as higher caking index，lower sulfur content，lower Gieseler fluidity index，lower Audibert-Arnu dilatation and higher alkaline oxide content，which result in a poor CSR of the coke produced.After coal blending optimization，i.e.high-alkaline-oxide-coal is minimized; the coke quality can be improved with CSR increased by 8%.
The characteristics and coking behaviour of Indonesian coal are analyzed.It has been applied in a 40kg pilot coke oven battery.The result shows that the Indonesian coal has the characteristics of gas coal,fat coal and coking coal.When the blending proportion is ≤13%,the coal quality is relatively stable,and the coking cost can be reduced.
In this paper, analysis is made on the correlation between the mean maximum reflectance of commonly-used coal vitrinite and thermal properties of coke test from individual kind of coal.The result shows that R0max appears the best CRI and CSR produced from 1.20%~1.40% coking coal.Production optimization can be done by an appropriate coal blending as guidance for routine production and coke quality stabilization.
It introduces the research and practice on improving average size of metallurgical coke produced by 7.63m coke oven battery.The average coke size increases by 2.3mm through upgrading coal quality,prolonging coking time,optimizing screen size and improving coke bunker level control,therefore stable operation of 5 800m3 blast furnace can be satisfied.
The structure and features of new coke guide are introduced.The new coke guide has been technically improved with respect to resistance to thermal expansion and contraction，abrasion resistance，corrosion resistance and replacement.Therefore，the coke guide car is more environmental friendly and more durable.
This paper analyzes the factors influencing the quality of water-steam in CDQ system and proposes an optimization for the plant in terms of steam types,demineralizing & water feeding system and waste heat boiler water system,etc.so that the CDQ steam energy efficiency can be increased and the water-steam quality can be improved so as to run the CDQ system in a manner of safety and high efficiency.
Analysis is made for the factors influencing the individual oven charge capacity for 7.0m coke oven battery.Measures are also taken,such as controlling the fineness of coal blends,improving coal screw feeding,optimizing coal leveling and upgrading leveling bar structure,so that achievements can be made,e.g.effective volume of oven chamber increased from 55.6m3 to 55.9m3,bulk density of coal charged raised from 0.750t/m3 to 0.758t/m3 and dry coal charged per oven increased from 40.8t to 42.4t,which lays a solid foundation for efficient production of coke oven.
The phenomenon and causes on CDQ circular air duct damage are analyzed in this paper based on the actual situation of the CDQ production.A technical solution and its performance are also discussed,i.e.a suspending supporting column is designed to prevent the CDQ circular air duct from collapsing.
Since the safety maintenance technology for CDQ chamber plays a key role in extending the service life of CDQ chamber,this paper proposes a multi\|section solid suspended ceiling maintenance technology for a safe and quick maintenance of the CDQ chamber,which can effectively shorten the maintenance time and extend operating period.
Through improvement on pressure measurement device at the bottom of coking chamber，the bottom pressure of the coking chamber can be collected automatically and continuously，so that accurate data can be provided to reasonably determine the set value of G.C.main pressure and the set pressure of the ascension pipe PROven system of 7.63m coke oven battery.
Integration method is adopted for the reaction kinetics analysis of TG curve.The reactions between coke of different grain size and O2/CO2 of different concentration are studied to obtain the parameters of reaction kinetics.The analysis shows that under the conditions of higher apparent activation energy and lower frequency factor,coke exhibits lower reactivity,less burning loss and higher stability.
This paper introduces the measures taken for oven temperature control under the conditions of extended coking time and during long\|time maintenance as well as its result.This application is worth while learning in the coking industry.
This paper analyzes a practical application of ABC control system in the sulfur recovery unit of Claus furnace in coal chemical industry.The result demonstrates that the ABC control system is able to quickly adjust the distribution of air ratio for precise supply of air and oxygen whenever the working condition changes so as to ensure a stable operation of the sulfur recovery unit,with sulfur recovery rate of 95%~99%.The ABC control system has been proven to be high level automation,beneficial to natural and working environment.
The sulfur contents in coal tar samples under different temperatures are determined.The results showed that the average value of the sulfur content increases with rising temperature,with maximum standard deviation 0.002 29% and maximum coefficient of variation 0.559%.The precisions of the samples measured under different temperatures,however,remain consistent.It is suggested that the sample temperature should be relatively kept constant to minimize the impact of the sample temperature variation on the determination results of the sulfur content.
Operating costs and operating status of the gas purification plant before and after shutdown of the solvent extraction dephenolization unit are analyzed in this paper.The result shows that the solvent extraction dephenolization unit has many functions，such as minimizing blockage of downstream units，cutting down bio-chemical unit loads，guaranteeing coking waste water discharge index and reducing the operation cost in gas purification plant.
Based on the running data of the integrated desulfurization and denitrification unit,static modeling is studied for the process.The data set is established according to the process and data preprocessing method.Classification of the working conditions and simplification of the sample set are realized by K-means clustering algorithm.Static modeling of each and every working condition is established with the help of neural network.The simulation result shows that this method and corresponding neural network are effective.
This paper introduces the measures for coking waste water recycling of Anyang Coking Plant as well as its performance.This application can achieve a reduction of fresh water consumption,operating cost and waste water discharge.
The measures of“Optimizing the existing system,connecting AIS in parallel,and adding Ozone Plus advanced treatment system” are taken to renovate the coking waste water treatment process.After renovation,the discharged waste water meets the standard requirement.This is a new way for the renovation of coking waste water treatment process.
The problems in tar-ammonia separation and coal water treatment are analyzed.By the application of dosing technology，tar and ammonia are effectively separated，oil contained in the coal water is reduced.Therefore，smooth flow in the pipeline can be ensured，and the COD of stripped water can meet the standard requirement.
The condensation from the gas final cooling system is sent to the ammonium sulphate unit and used as make up water for ammonium sulphate production.Less water is consumed and less stripped waste water is generated.Therefore the production cost is reduced.
As an important industrial material in the development of carbon material,demand on the needle coke increases sharply.However,the yield of needle coke is limited and the cost is high,because the raw material for production of needle coke is in shortage.The industrial status,price trend and development prospect of needle coke are discussed.
This paper describes a minimized fuel cost in ironmaking by fully utilizing cow manure and by improving the combustibility of pulverized coal and decreasing the use of pulverized coal and cokes to build a eco\|friendly steelworks,which will have a broad prospects in application.
Different proportions of steel slag were added to the 1/3 coking coal to produce coke，and the properties of coke produced were studied.The result showed that the amount of steel slag should not be too high to control the content of ash and sulfur in coke.The reactivity of coke increased with addition of steel slag increased，while the coke strength after reaction decreased.With same amount of steel slag added，the smaller the grain size，the greater influence on the thermal property of coke.The specific area of coke increased first and then decreased as the solution loss reaction continued.SEM study showed that there was no obvious change in pore structure when the addition of steel slag is less than 5%.
The formation mechanism and influence factors of thermal NOx during coke oven heating are investigated by using CFD numerical simulation method，which chooses one couple of heating flues of a 6m BFG-firing coke oven battery.The results show that the excessive air ratio has a great influence on the formation of NOx，i.e.with the increase of the excessive air ratio，the NOx concentration first increases and then decreases.The heat flux also has a significant impact on NOx formation.With the decrease of the heat flux，the maximum temperature of combustion increases and the amount of NOx formation increases.For different heat flux value，the excessive air coefficient on the temperature distribution and concentration distribution of NOx in heating flue are different.
Based on the application software FLUENT in Computational Fluid Dynamics (CFD) and by using Eulerian multiphase flow，we carried out a simulation for heat transfer between coke particles and circulating gas with a 140t/h CDQ system of a coking plant to demonstrate the feasibility of this method and verify the correctness of the calculation results.Through the analysis of the results from several CDQ calculating conditions，we can also show the capability of multiphase flow model to describe the temperature variation of different grain\|sized coke.
This paper studies quality indices of coking coal,such as Audibert-Arnu dilatation,caking property,value Y of the maximum thickness of gelatinous layer and volatile,etc.It also analyzes the correlation of the Audibert-Arnu dilatation of diversified coal kinds and the above-mentioned indices.The result shows that the Audibert-Arnu dilatation varies with the degree of metamorphism of coking coal,which will give directive guidance for coal blending.
Three typical coking coals are selected to study the CRI and CSR of coke and the change of fractured surface before and after adding different proportions of inert material,of which the proportions are determined according to the caking property and active inert composition ratio of each coking coal.
Concerning the problems of intermittent black smoke and high content of NOx in the tail gas，the influence of standard temperature of coke oven，reversing process and excess air factor on the generation of NOx is studied. Proper heating conditions are finalized according to the influencing factors.
This paper introduces all the preparations before coal charge during start-up of 7m coke oven.It realizes zero crude gas bleeding from initial coal charge during the start-up,which not only minimizes pollution to the atmosphere,but also increases the by-products recovery yield,such as coal tar and crude benzol products.
In this paper，analysis is made for the causes to the damage at outer shell of the inlet duct of WHB (waste heat boiler).Improvements are also given for a better inlet duct lining structure，i.e.the original monolith concreted arch is changed to wedge type brick-laid arch structure，which runs very well without any problem and with extended service life of the WHB inlet duct，stabilized CDQ production and less operating cost.
This paper analyzes the causes of frequently-happened hard push for 6m coke oven battery.It also gives countermeasures to successfully control the hard push,such as by optimizing coal blending,minimizing graphite formation on the heating wall,keeping a rational inventory of coal yard and controlling pushing current,etc.
Based on the main factors impacting the coke thermal properties, this paper analyzes and describes the development and application of a testing technology for coke thermal properties for sharing experiences and reference in cokemaking industry.
The technical features of desulfurization technology and low temperature denitration technology for coke oven flue gas are analyzed.The coke oven flue gas de-SOx & de-NOx project of Zhanjiang Baosteel is introduced with respect to the technology,commissioning and result.This is the first successful industrialized plant for de-SOx & de-NOx of coke oven flue gas,which works stably and meets the standard requirements.It can be taken as a reference for other projects.
Domestic and abroad situation and technological development of special raw material for production of special coke,as well as the technical indices of high quality binder asphalt,high quality impregnant asphalt,low cost and high quality self sintered mesophase coke powder are introduced.
Application of coke oven flue gas de-SOx & de-NOx technology
The coke oven flue gas goes to the de-NOx system to remove NOx,passes the waste heat boiler system to reduce temperature and generate low pressure steam,and then travels through the de-SOx system and de-dusting system to remove SOx and dust respectively.Finally the discharged waste gas meets the relevant requirements stipulated in Emission Standard for Pollutants in Coking Chemical Industry GB 16171—2012.
The mechanism of dry desulfurization of coke oven gas is studied.Problems found during operation are analyzed and countermeasures are made.It is proved that the improvement is effective.
Study on catalyst regeneration in the pre-reactor of hydro-refining plant
The main reason for the increasing pressure difference between catalyst beds in the pre-reactor of hydro-refining plant is analyzed.Different regeneration processes are compared.Catalyst unloading and regeneration procedures for ex situ regeneration are introduced.
Based on the features of different media and many years experience on instrument maintenance,the reasons for the blockage of transmitter pressure pipe are analyzed and corresponding solutions are provided.It provides a reference for similar problems in other plants.
Concerning the deterioration of solvent quality of hydro-refining system，solvent-heavy oil separation device is provided to ensure good quality of the solvent and continuous regeneration of solvent，providing a sound basis for the stable operation of the hydro-refining system.
The fluctuation of circulating solution in the desulfurization column is analyzed.The problem of air lock in the solution pipe flowing by gravity from the regenerator to the desulfurization column is solved by installing a vent pipe.Therefore the production of the desulfurization unit is stabilized.
A Low temperature physical separation technology for tar residue is developed to deal with the problems of sticking to the belt,uneven mixing and late treatment which are found during coal briquetting with addition of tar residue.After separation,the water content in the tar residue is very low,so these problems are solved.Part of coal tar can be recycled to protect the environment.
ISSN 1001-3709 CN 21-1164/TQ Sponsor:ACRE Coking & Refractory Engineering Consulting Corporation,MCC Postal Code:8-28
