Common problems are summarized in coal preparation of coking industry of China,such as coal yard management,laboratory test analysis,coal blending management,etc..Based on the optimum system concept,suggestions for this technology development are proposed in terms of process selection,systematic management for lab test data,refined coal blending,and comprehensive management for coal blending and cokemaking,etc..
Melting loss process,its mechanism and microstructure change of the metallurgical coke under different alkali loading states are discussed.This research will be beneficial to study for the coke condition in blast furnace,assessment for the prevailing coke quality system and guidance for producing a rational coal blending scheme.
Analysis is made for the calculation results of coke oven heat balance,heat efficiency and cokemaking heat consumption based on the heat balance determination for different type of batteries.Measures are found to reduce the heat consumption,such as adopting a rational heating system,stabilizing the charged coal moisture,reducing heat loss carried with waste gas,lowering the battery heat radiation,improving the tightness of the refractory bricks,etc.so as to achieve energy saving and emission reduction.
The regular quality index and coking behavior index of the non-mainstream gas coal from Australia are analyzed.Coking coal resource can be selected and coal blending can be optimized in a rational manner.In 2016 and 2017，Shaoguan Iron & Steel used non-mainstream gas coal from Australia，which has lowered coal blending cost by 62.609 million Yuan and brought annual economic profit of 31.305 million Yuan.
Coal analysis is done for 14 individual kinds of coal before coke is made by 40kg test oven.Multiple linear regression equation is created by SPSS,i.e.the relation is expressed between coal VM,mean maximum reflectance of vitrinite,bond index,basicity index and the CRI & CSR,with related coefficients 0.964 and 0.941 respectively,which shows a close correlation.
The modular designs for overseas coking projects are introduced in terms of design principle,design parameters selection under operating conditions and its advantages.Sole modular design principle and its key points are analyzed based on the example of modular design for gas exhauster house of 2.2 mt/a coking project of ESPP Steel,Australia.
The improvement of COG calorific value measuring system is introduced in this paper.The improved system can have on\|line monitoring for the calorimeter and its ambient condition for immediate maintenance and safe operation of the system in case of the gas leakage.
Due to the irreversibility of silica brick temperature drop during secondary heating-up for coke oven battery,thus there would be a certain difference from the newly\|built battery in thermal expansion.i.e.the battery will have an obvious total expansion after the secondary heating-up,but a relatively smaller expansion during the heating\|up.Furthermore the expansion rate goes down before 300 ℃ during the heating-up and goes up after 300 ℃.
Feasibility study for cyclone dust collector as primary deduster for CDQ unit
Based on the theory of fluid mechanics and by calculation and comparison between cyclone dust collector and gravity dust collector,confinement reasons are found for holding back the cyclone collector as primary deduster for CDQ unit.Design selection,fabrication,installation and execution result,etc.in practice are introduced.The study result shows that the cyclone collector can replace the conventional primary deduster even the secondary one in the CDQ unit,and can meet the process requirement with features such as simple process flow,low investment and good performance,etc.,with dust content in circulating gas lower than 1 g/m3.
In view of the features of coke oven steam lines,simulation is done for stressed pipeline and its deformation under actual operating condition through 3D modeling and calculation by using CAESAR II for calibration and improvement in design.An elaborated Stress ISO metric drawing and report can thus be obtained to improve the engineering,which shows a satisfactory application in coke oven steam line system.
The waste flue gas of coke oven is different from that of other plants due to its unique process,particularly with an obvious sign that there is a short time peak of SO2 content in waste flue gas during gas reversing.Analysis is therefore made for this SO2 content variation so that its impact on the emission purification system can be eliminated or reduced and operating cost can be lowered.
Overflowing of dephenolized naphthalene oil tank is introduced in production replacing the tank standing method,which can reduce the phenolate content in feedstock of dephenolized naphthalene oil and improve the stability of technical naphthalene plant.The optimization of operating parameters for the technical naphthalene plant can also minimize energy consumption,finding a reduction down to 87.26m3/t in COG consumption and saving energy cost by about 0.64 million yuan per year.
Coal tar hydrogenation is a process to remove impurities such as metals，sulfur，nitrogen，oxygen，etc.by hydrofining and to produce fuel oils by aromatic and olefin saturating.The coal tar as feedstock must be pretreated to meet the requirement of hydrogenation.To this end，three options for distillation as pretreatment are introduced；comparison is also made among the options in terms of investment，process flow and energy consumption,etc.
Quinoline insoluble (QI) can be removed from coal tar by using solvent in centrifuging process.The solvent and centrifuging condition affecting the QI removal efficiency are studied.The rest result shows that the more amount solvent,the longer centrifuging time,the better QI removing result we will have.
Analysis is made for process and costs are compared in view of the situation that the NH3 content is low in gas under low\|temperature carbonization.Improvement idea is forwarded based on the original design for the gas purification system.
The comprehensive utilization of waste liquid from desulfurization is introduced.The recycled liquid can be treated for producing ammonium sulfate and the remaining PDS catalyst can be regenerated.The combination of COG desulfurization and ammonia removal can keep the desulfurization system running stable,which achieves a good benefit in terms of economy and environment protection.
In case of corrosion in plant,it would shorten the service life of equipments and result in rising cost in production even injury and death and pollution due to the medium leakage.The corrosion-resistance mechanism of the fluorosilicone resin and its application are introduced,which has been proved satisfactory in practice and a new solution to the corrosion-resistance in coal chemical industry.
Analysis is made for the behaviors of coke oven waste gas from 6m battery fired with COG.Introduction is also given for the process in sequence of SCR DeNOx under low temperature,waste heat recovery and a new DeSOx by catalytic method, which can solve the problems of inactive catalyst due to blockage as well as off-line regeneration and maintenance, and therefore realize ultra-low emission in manner of stability and high efficiency and a comprehensive utilization of the waste heat and diluted sulphuric acid.
The tail gases from different storage tanks during gas purification are sorted and collected.Interlocking control system is installed,which allows the VOCs in the process of gas purification to be recycled to the production system.Nitrogen sealing system runs stable with less pollutants in practice,which ensures comprehensive utilization of resources.
Study on treatment of phenolic wastewater in needle coke production
The adsorption performance of different resins for the phenols and the regeneration performance of the resin are investigated based on the phenol-containing wastewater produced in needle coke production.The results show that the styrene-based macroporous resin has the best adsorption performance for the phenolic compounds in the waste water.Moreover,it can effectively remove the aniline in the waste water,i.e..850 mL waste water can be treated by 60 mL resin and the treated water can conform to effluent discharge standard.The resin after 3 times of adsorption-desorption experiments,still remains effective,which can be repeatedly used in continuous operation.This treatment is proved simple in process,economic and efficient in operation and environment-friendly,showing a broad prospect in utilization.
This paper introduces current situation of pollutant emissions in coking industry,illustrates the abuse of treatment in the end and studies the preventive measures against SO2 and NOx pollutants from coke oven waste gas.
The application of DeSOx & DeNOx from coke oven flue gas in Ansteel is introduced that the SDS dry type DeSOx process is characterized with high adaptability，simple operation，easy maintenance and high efficiency of desulfurization.The by-products from desulfurization are of solid，which can be recycled and utilized without waste liquid produced.The emission from CDQ unit and coke oven flue gas can be gathered and treated together to minimize equipment cost for energy saving and efficiency improving.
Through research & development of sinter cooling in shaft chamber and its waste heat recovery,the technical bottlenecks are tackled and the technologies of sinter cooling in shaft chamber and its waste heat recovery are established based on CDQ design philosophy.The result shows that the technologies can effectively improve the rate of resource recovery and secondary conversion efficiency and reduce energy consumption in sintering production.
In view of the unpredictability for the caking properties of blended coal,a bottleneck in coking industry,due to mixing with low caking coal,thus comparison is made for the impacts to the blended coal caking properties between two scenarios,i.e.blending with two kinds of low caking coals (5%~25%) individually and blending with them both.The result shows that for most of caking properties of the blended coal,there will be a clear linear dependence between the values predicated and measured when blended with the said two kinds of low caking coals.It is found that the value b can also be accurately predicted by the equation in this paper.
Numerical simulation of NOx formation is done for the multi\|concentration fields of waste gas recirculation combustion inside coke oven vertical flues.The impact of air and gas inlet size and waste gas recirculation to the NOx formation is studied.The result shows that most of NOx is formed at the high temperature zone in the middle of rising vertical flue.Increasing external gas circulation would reduce the combustion temperature and narrow thermal peak so as to decrease the NOx formation.When the external circulation rate is 20%,the maximum temperature is lowered by 88 ℃ and the temperature field gets more uniform.When the inlet area is cut by half,the internal circulation rate is increased to 1.95 times and the NOx emission is reduced by 13.7%.
Since problems are found in two blocks of 7.63 m coke oven in Masteel,i.e.the worsened flatness of oven roof and displaced charging hole,revamp is done by restructuring the charging hole frame,re-bricklaying oven roof,re-leveling the charging hole elevation and making a roof slope.Additionally,the roof material is upgraded and the bricks for emergency evacuation lane is modified.All these revamps can be used as reference for similar projects in China.
The rule of SO2 variation in waste flue gas is studied.By doing experiments and analyzing data,designers can be able to obtain the basis for design of waste flue gas purification,even more accurate measurement for SO2 variation by adjusting operation and upgrading test method,etc..
In the process of cokemaking，the atmospheric pollutant discharged from coke oven chimney is referred to as the waste flue gas after COG combustion，mainly including SO2，NOx and emission，etc.，which are the major causes of environmental pollution.By analyzing the mechanism of NOx formation in the waste flue gas and adopting the technology of COG dilution，the content of NOx in the flue gas can be dramatically reduced and the generation of NOx，therefore，can be rooted out.
Through CDQ project examples,analysis is made for the impact of CDQ boiler related data,such as main steam parameters,condensation parameters,circulating water efficiency and steam turbine efficiency,to the CDQ thermal system investment and its power generation capacity.For increasing power generation capacity of the CDQ thermal system,comparison should be made in terms of investments and profits to single out an optimum option before the stage of engineering.
The condition of improving the CDQ circulating gas cooling technology and the related equipment,i.e.the circulating gas cooler,is generally described in this paper.The CDQ circulating efficiency is improved,safe and stable operation of the CDQ system can be ensured.
With upturning of steel industry,4.3 m coke oven battery that has been cooled down to normal temperature can be repaired.The current situation of the coke oven refractory brickwork is introduced,including the brickwork repair procedures and precautions.The repaired coke oven can be put back to production,with less emission and flame leakage.
The recuperative cooler for CDQ dedusting system has high temperature at inlet and outlet,which frequently causes alarm and shutdown of the dedusting fan,even interruption of CDQ production.Thus an air valve is added before the recuperative cooler to cool down the dedusting system and improve its operating condition.The result turns out to be satisfactory.
Application of light wash oil replacing that of national standard for crude benzol production in the Coking Plant of Liuzhou Iron & Steel Co.,Ltd.is introduced in this paper.The statistics shows that the light wash oil can obviously improve the quality of circulating wash oil and reduce its consumption.
The current asphalt products in market and their producing processes are briefly discussed.A new process for commercial production of coal tar refinery,in combination of distillation and extraction,is introduced,which has features of diversified asphalt products,easy operation,safety and reliability and high quality as well.
Several modified pitch granulating processes are introduced.The new process of pitch pressing under water is described in details.Improvements are made in terms of pitch granulation temperature,pitch molding pump selection,use of nozzle for pitch molding machine,pond water flow and pitch forming,etc..
The waste heat of flushing liquor is recycled to power Li-Br chiller for producing 16～18℃ chilled water which will be used by primary cooler,desulfurization pre-cooler and final cooler etc.,so that energy consumption such as fuel gas,steam,and the like can be saved.
In this paper,introduction is made for technologies of recycled tar residue in coal blending,recycled coke breeze in coal blending,coke dust recycling,and coking sludge treatment.Discussion is also made for their advantages and disadvantages,which can be used as a reference for selecting waste solids treatment process.
Waste quenching water is treated by oxidation-coagulative sedimentation process.The result shows that this process is running good, with the treated water quality in line with the indirect discharge requirement listed in table 1 of national standard GB 16171—2012, which can be used as make\|up water for quenching.
Discussion is made for recovery,delivery and harmless treatment for VOCs in coking industry.Study is also made for the technology of introducing VOCs containing vent gas into negative pressure gas system.Suggestions are given for environment protection during this treatment.
A modification has been done for the existing coking waste water system according to the effluent behaviors and water quality.A new bio-process with built-in type packings can increase the efficiency of total nitrogen removal from 58% to 95% and can control the total nitrogen content lower than 20 mg/L at the plant outlet so as to meet the requirement of waste water discharge.
Since thiocyanide is the most important factor influencing de-nitrification in the phenol cyanide effluent,pre-decyanation tank is therefore added before the conventional bio-chemical treatment system as modification,which can dramatically reduce the content of thiocyanide in the effluent to ensure a stable running of the downstream bio-chemical system.
In this paper,the atmospheric problems posing to coking industry are summarized from two aspects,i.e.state and local industrial policies and the status quo of air pollution in coking industry.The technical solution to ultra-low emission for coking industry is put forward,and the way of reducing air pollution emission is analyzed,which provides technical support for the authority of ecology and environment as well as coking enterprises.
In this paper,the relationship between the microstructure and thermal properties of coke was studied,and the characteristics of stomatal structure and optical structure of industrial coke with different CRI and CSR indexes were analyzed.The fixed solution loss test at 1，100 °C was carried out by continuous thermal weight loss method,and the strength index CSR25% after the coke solution loss at 25%.The relationship between coke thermal properties and microstructural parameters was established by multiple linear regression.It was found that the average thickness of the pore walls was most closely related to the CSR25%.The conclusion provides important support for refined coal blending,optimizing coke structure and performance.
A pair of vertical flues of JN60 coke oven combustion chamber are selected.The CFD numerical simulation is used to establish a coupled model of air depleted combustion intensity and combustion fluid multi-concentration field.The heat mass transfer process was simulated,and the calculation results are basically consistent with the design values.On this basis,heat flux density of the coke oven and turn point size were changed to minimize the NOx emission fundamentally.The simulation result shows that the heat flux density has much influence on the NOx,i.e.when the heat flux density is 4,800 W/m2,the NOx concentration is 742 mg/m3,when the heat flux density reaches 7,600 W/m2,the NOx concentration drops down to 135.1 mg/m3，reduced by about 600 mg/m3；similarly,the more opening of the turn point,the higher inner circulation rate,the wider reaction zone,the lower consumption rate of the reactant and the lower NOx formation as a result.
An integrated process and device for CDQ coke moistening,dust suppression and water recycling are introduced in the paper.In this process,not only the coke inside bucket is sprinkled with water for humidification,but also the steam and coke dust generated can be precipitated as well as the waste water can be recycled,which will be beneficial to energy saving,emission reduction and lowering operating cost as well.
This paper introduces technical standards of pilot oven，and principles and procedures of cokemaking tests;and expounds on the role of cokemaking tests in pilot oven and their guidance and application to real production.Cokemaking test in pilot oven plays a significant role in simulating production of industrial coke oven.It is used to scientifically evaluate coking coal，optimize coal blending and cokemaking process，reduce coal blending costs，predict coke performance as well as test technical feasibility.Cokemaking test in pilot oven provides technical support for industrial coke oven.
This paper analyzes changes of coke properties and grain size composition in the 6 m coke oven when heated by different gases.It is found that BFG-fired coke oven will have much easier coking process control，higher coke quality and better heating distribution in vertical flue.
The application of heat pump technology in 200 t/h CDQ project is introduced.A comparison is made for several options in terms of power output,energy consumption and energy to be supplied,etc..The result shows that the heat pump considered as a solution for power generation at engineering stage could increase total thermal efficiency,lower investment and land occupation for circulation system as well as improve comprehensive benefits for the CDQ project as a whole.
Emergency system for pusher machine was introduced,which can effectively protect the pusher machine for safety purpose and prevent the pusher ram,leveling bar and guide cage from being burnt in case of power failure.It also turned out to be reliable in performance and low in cost, which can be widely used in production.
This paper introduces an upgrading proposal of a 140 t/h CDQ system,and presents differences in production before and after the modification.After the upgrade,the CDQ system steadily operated.The problem of uneven drops in the cooling zone was resolved.The temperature of discharged coke was lowered by 15 ℃.The suction at inlet of the boiler and the resistance of the CDQ system were also reduced.These helped to lower the operating costs of the CDQ system.
This paper introduces the conditions of two blocks of 6 m coke ovens and analyzes the main causes of end flue damage as well as the advantages of re-bricklaying for oven end flues with low expansion rate silica bricks by uncovering from battery roof.Thus solutions can be given to the damage and deformation on heating wall at end flues and the oven end emission escaping and flaming as well.Compared with using ordinary silica bricks, the overall time schedule can be shortened by around 110 days, coke can be saved by 23 210 tons approximately and coke output can be increased by 50% plus.
A test is introduced for lowering the NOx in the emission of coke oven waste gas by controlling the pollution source. The test result shows that the NOx is reduced in the coke oven waste gas since the waste flue gas is recycled and blended with combustion air, which also remarkably improves coke oven heating in vertical direction.
The process of sulfuric acid making with fluid sulfur slurry as feedstock is characterized with safety,environment protection,stability and high automation.The key to control of diluted sulfuric acid formation amount is to strictly control the concentration of sulfur slurry into the incinerator.If ammonium sulfate process is adopted for ammonia removal,the diluted sulfuric acid,as by\|product,can be delivered to ammonia sulfate saturator and completely recovered.
Lean coal solvent hot extraction is studied with Lewis-acid metals as catalyst.The result shows that the catalysts help to improve hot extraction rate，in particular zinc sulfate has the best performance，with hot extraction rate of 46.1% and optimum dosage concentration of 5%.
Discussion is made in this paper in terms of process flow，technical features and purposes of coal tar distillation at present.The newly developed negative pressure distillation process of coal tar and its features are introduced in details.By comparison，the strong points and values of the new process is highlighted.It provides a better technology for new or retrofitted tar distillation units in China.
We obtained optimized operating parameters by analyzing the datum such as operating temperature,steam consumption,reflux ratio and products quality,etc.by numerical simulation.The fine tuning of the operating system can not only guarantee qualified crude benzol products,but also reduce naphthalene content in circulating wash oil so as to prevent the naphthalene from separating out inside benzol scrubber and decrease the naphthalene content in the purified gas,which will lay a solid foundation for further treatment of the coke oven gas.
Problems were found during maintenance such as uneven slagging in modified pitch reaction vessel,partial collapse of deflectors in heater as well as guard wall peel-off from the reaction vessel.By improving the deflectors and adding temperature measuring points for circular tail gas flue,satisfactory results can be achieved,such as the slagging can be minimized at the bottom of the vessel,deflectors inside the heating chamber can be effectively monitored and oil leakage from the reaction vessel can be avoided.
This paper introduced a process of feedstock tar dehydration by using waste heat from oil-vapor on top of pre-dehydration column and dehydration column recovered by heat pump.This process is a new and energy-saving technology,with low operating cost and easy operation,which can be widely used in this industry.
The gas purification plant is equipped with storage tanks of coal tar,crude benzol,and ammonia liquor,etc.,and NH3,CmHn and H2S could be released from those tanks.On account of medium characteristics of the tanks and composition of the volatile gases,improvement is done in aspects of tail gas collecting,safety measures and operating procedures.As a result,this attempt can not only meet environmental requirements,but also reduce annual costs about 600，000 yuan.
In coking project (Phase I) of Baosteel, the SDA deSOx process is used to remove SO2 in the emission.The deSOx system is composed of spray scrubber and bagfilters.After purification, the concentration of SO2 in the emission is not higher than 30 mg/m3.This paper summarizes the potential risks in case of off-specification emission from coke oven, and gives the solutions.
In general,the contents of sulfur dioxide and sulfuric acid mist in the tail gas of sulfuric acid plant are relatively high,which makes it difficult to conform to strict environmental criteria.To this end,the tail gas should be further treated.This paper mainly introduces the treatment technology of SO2 and acid mist in tail gas forced absorption with sodium hydroxide solution.After the further treatment,the emission can meet the relevant requirements.
Pitch fume treatment in coal tar refinery is introduced,i.e.the processes of absorbing,adsorption,electrostatic precipitation and incineration,in particular the combination of wash oil absorbing and incineration process,which can be promoted in production for its proved easy operation,low cost and good purification result.
This paper analyzed the features coke oven waste gas and the cause of pollutants,discussed the bottleneck in the DeSOx and DeNOx process selection,summarized several integrated DeSOx and DeNOx technologies and outlined the future of waste gas purification technology.
The MnOx/AC catalyst was prepared by the equal volume impregnation method.The effects of manganese precursor,catalyst calcination temperature and loading on denitrification activity were investigated.The catalyst was characterized by H2-TPR.The results show that the catalyst with KMnO4 as the precursor of manganese,with the loading Mn by 20%(wt.%) and calcination at 400 ℃ has the best adsorption and denitrification performance.At 180 ℃,the maximum denitrification rate is above 99%,and still above 80% after 120 minutes of reaction.
This paper introduces the function and application of CRI testing apparatus under dynamic determination,puts forward the method of evaluating quality of dynamic CRI by using the characteristic value Ft of coke reacting with CO2 gas through experimental research,and discusses the relationship between Ft and coal blending technology,coke ratio of blast furnace,etc.
The convective heat transfer and radiation heat transfer of coke oven riser heat exchanger are calculated in one coking cycle.The averagecomprehensive heat transfer coefficient of heat exchanger is 52.8 W/(m2·K).In the whole coking process, the gas flow is fully developed, andthe radiation heat transfer has nothing to do with the flow state of the gas.In the later period of coking, the decrease of gas flow rate andthe decrease of heat transfer will result in the change of the wall temperature of the ascension pipe.In the late coking period, the sudden change of temperature in the inner wall can be reduced by strengthening the radiation heat transfer between the crude gas and the inner wallof the riser and increasingthe flow rate of the crude gas properly.
We have several methods in coal blending test for stamp charge battery and have found different correlations from pilot oven test,iron boxtest and commercial stamp-charge oven test by using individual kind of coal with different coal ranks.By testing coke quality,we are able tofind the laws in pilot oven test,iron box test and commercial stamp-charge oven test with individual kind of coal and blend coal.
In this paper,the effects of the variation in temperature,expansion pressure and pushing resistance are analyzed,and how to avoid the damage to the heating wall in production is put forward.Through management and operation in scientific and standardized way,the damage to the heating wall is minimized to the extent of improving the working efficiency of coke oven and extending its service life.
This paper introduced the control process and features of 7.63 m battery pusher machine and analyzed the defects in individual control and integrated system control，in particular too much operating time on one-step logic control.Through the optimization，its operating time can be cut from 681 seconds to 627 seconds and its automation level can be upgraded.
In View of the characteristics of high ash content and low caking index of raw coal,an optimum coal blends was selected by optimizing the raw material composition and through 200 kg pilot oven test,and the production was put into practice.The results showed that under the condition of reducing the premium coal by 5%~15%,the strength index of FC80 coke and FC83 coke are equal,which can meet the requirements of coke quality for blast furnace smaller than 1,000 m3.
In view of the residual quenching water in spillage coke bucket on 7.63 m coke oven pusher machine，which cannot be recycled，we thus have developed a recycling device on the spillage coke plate to reuse the residual quenching water without adding additional power so as to lower the operating cost，save water resource and minimize effluent pollution.
Major problems during modification from top-charge battery to stamp-charge are introduced in this paper.One battery with dual functions,i.e.top-charge and stamp-charge change over,can be realized by keeping the top-charge oven proper unchanged and modifying relevant equipment.Integrated dedusting technology is also adopted so that charging emission of stamp-charge battery can be solved.
Comparison is made for modified pitch-making process,such as reactor type heating process,negative pressure single furnace single reactor tubular furnace process,negative pressure single furnace double reactor tubular furnace process,and negative pressure double furnace double reactor tubular furnace process.Basis can be therefore provided for selecting a modified pitch making process in terms of a suitable capacity,stable quality of products and green production.
In crude benzol recovery unit，there existed such problems as high consumption in steam，cooling water and gas，as well as low yield of crude benzol.Through technical upgrading，the steam consumption decreased from 5.5 t/h to 4.35 t/h，with daily reduction of 27.6 t in total.The cooling water consumption fell from 1 250 m3/h to 620 m3/h，and gas consumption from 1 120 m3/h to 820 m3/h.The yield of crude benzol increased from 0.828% to 0.847%.As a result，the technical upgrading helped to lower energy consumption and increase crude benzol yield.
In view of methanol production drop due to deficiency of COG in the methanol plant, the COG compressor was modified larger plus COG cooling technology for an effective increase of COG feeding and methanol capacity.
Through simulation for benzol stripping under atmosphere pressure and negative pressure by using CHEMCAM software,a new benzol stripping technology under negative pressure is developed and applied,it can lower the consumption of direct steam and gas,and minimize waste water discharge etc..
According to actual production condition,intelligent type ammonium sulphate storage system was designed,including the systems of automatic packaging,automatic handling,automatic ex-work and storage management.It has functions of storage management,AGV management,task dispatch,real-time navigation,traffic control,site equipment signal acquisition and action control,etc..
This paper introduces the HPF ammonia desulfurization unit for COG.The reasons which caused the excess of the H2S in the HPF ammonia desulfurization unit are the high sulfur content of the mixed coal and the high temperature of the desulfurization unit.The H2S content in the COG after the HPF ammonia desulfurization unit can be decreased to about 100 mg/Nm3 by adding a cooler for the desulfurization liquid without changing the coal blending ratio, which obtains good results.
The temperature of chimney emission after desulfurization and denitrification may drop below the acid dew point.In this paper, the commonly\|used calculation formula and empirical formula of acid dew point are compared and analyzed.It will find the suitable temperature of coke oven chimney emissions under different conditions to avoid low temperature corrosion, which plays a role of guiding significance in cokemaking.
An example is shown for treatment of high sulfur circulating gas from a CDQ system,in which two methods of high sulfur circulating gas dedusting and ultra-low discharge of the emission after DeSOx are introduced,i.e.one is to build a new emission control system for the CDQ,another is to use the existing DeSOx and DeNOx system for the high sulfur circulating gas treatment.Technical and economical analysis is also made for the two methods.
According to the actual situation of 7 m battery operation, we have taken measures, such as process optimization, equipment innovation and fine management to meet the stringent requirement, i.e.NOx＜100 mg/m3 after DeNOx treatment and minimize energy consumption, like soda, liquefied ammonia and COG, with annual economic benefit up to 3.24 million RMB yuan.
This paper introduces ammonia liquor evaporation process,its equipment and control philosophy,points out the potential problems during denitrification operation so that control indexes can be timely adjusted to ensure stable operation of the ammonia liquor evaporation process and ultra\|low emission.
ISSN 1001-3709 CN 21-1164/TQ Sponsor:ACRE Coking & Refractory Engineering Consulting Corporation,MCC Postal Code:8-28
