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 ℃.

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.

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.