The schemes of improving tar yield and quality by lignite pre-treatment are discussed.The advantages and disadvantages of different pre-treatment schemes are compared.Thermal pre-treatment and solvent swelling pre-treatment are easily to be industrialized.The development of ionic liquid pre-treatment is introduced.With this method,the pyrolysis tar yield and light tar yield can be remarkably increased.

The function of Gieseler fluidity in guiding coal blending for coking is analyzed.The result shows that the individual coal can be quickly identified by Gieseler fluidity.There is obvious correlation between the maximum degree of fluidity and caking index，plastometer indices and maximum reflectance of vitrinite.The Gieseler fluidity and temperature shall be taken into consideration during coal blending.

To meet the requirement on coke quality of large scale blast furnace,the influencing factors of coke screening and transfer system on coke grain size are analyzed.It is found that the coke grain size can be increased by controlling the coke charging flow,increasing the area receiving coal,coke screening flow control and coke charging at low level.

The reasons for the damage of the water seal tank on the top of CDQ chamber are analyzed.By improving the structure of water seal tank and adding high temperature resistant and inflaming retarding and thermal insulating material,the overall rigidity and thermal endurance of the water seal tank are improved,the service life of spare parts is extended and the equipment cost is reduced with an annual economic benefit of 556 000 Yuan/set.

The structure of a recirculating water tank with the function of automatic purification,its usage and recycling principle are introduced.With application of such water tank,about 40 000t/a of water can be saved for each set of CDQ water sealing system.The effect of water saving is remarkable.

By analyzing the relationship between the steam output of CDQ and air flow,temperature and apparent heat of coke during actual production,the factors influencing the output of steam are found out. Corresponding adjustments are made to improve the steam output of CDQ plant.

The generation and harm of water hammer effect of coke wet quenching system are introduced.The hammer effect which occurs during shut down of the quenching pump is controlled by soft starters under different control mode.The result shows the pump-controlled soft starter can realize soft shut down of the quenching pump,and so it can effectively overcome the problem of water hammer effect of the coke quenching system.

The reasons for the ash accumulation in the CDQ boiler pipe and the harm to production are analyzed.The working principle of sonic soot blowing,the composition and features of  sonic soot blower of high sound intensity and adjustable frequency,its application on CDQ boiler and actual effectiveness are introduced.

If the heating wall of coke oven battery is first repaired and then heated up under hot state,the adjacent heating wall and the wall surface not repaired will be damaged more quickly.Regarding to this problem,the revamping-heating technology is adopted to repair the heating wall while heating up.The expansion joint of silica bricks can be determined according to the temperature.With this technology,the repair effect is satisfying.It is of great significance for coke oven maintenance under hot state.

Bracing system management and temperature monitoring during protective cooling down of coke oven battery are introduced.Protective cooling down is to provide more protective force to the oven wall by increasing the load of springs,so that the temperature decreasing rate of the battery proper is slowed down effectively.

The application of DCS S7-400 in the production control system of 7.63m coke oven battery,and the system structure,control philosophy,and man-machine interface of the whole automatic control system are introduced in this paper.DCS system can overcome the difficulties in data collection and mangement,complicated sequential control,safety interlocking and stable and reliable communication with other devices during the production of large scale coke oven battery.The field equipment can be monitored and controlled accurately in the center control room.

The personal injury accidents in the past six years in a Steel Complex are statistically analyzed.The result shows that the design of traditional coke oven battery needs to be optimized,reserving enough space for safe arrangement of platform,rail and passway,and the production equipment has to be advanced.

To solve the problem of floating coke in the corbel zone of CDQ chamber,a new partition type corbel zone structure and auxiliary technologies are adopted.Compared with the single channel corbel zone structure, the flow of circulating gas is reduced by 30%.The resistance in the chamber is reduced, and there is no floating coke in the corbel zone.Therefore, the capacity of CDQ chamber is increased by 40%.

The pressure of gas collecting main (GC main) is one of the control data for coke oven production.The method to determine the control value of GC main pressure is studied.By using a new type of electronic manometer,the pressure of GC main and at the bottom of coking chamber is measured,based on which the control value of GC main pressure is finalized.

Based on the features of coke oven flue gas,the denitrification catalysts having the properties of good activity,sulfur resistance and water resistance under low temperature are studied,guiding the development of denitrification catalyst for coke oven flue gas.

The development status of anthracene oil hydrogenation projects in China is introduced,the technology development of heavy oil hydrogenation is summarized,the marketing situation of anthracene oil hydrogenation products is analyzed,and the future development of the projects is discussed in this paper.

The citrate process for SO2 removal from the flue gas by multistage absorbing-desorbing is introduced.The SO2 obtained via this process can be reused as resource together with the typical resources of the coking enterprises.

With the use of existing waste water treatment facilities,by increasing the concentration of the activated sludge in the aerobic tank,the load of sludge is reduced,stable operation of the biochemical treatment system can be ensured,and the waste water treatment effect is improved.

With adoption of regenerative combustion furnace, the heat efficiency of coal tar processing waste gas treatment is higher than 96%.By waste gas pre-treatment and burning, the average purification efficiency of pollutants is above 95%.It has the features of high purification efficiency, broad application range and stable operation.

The two-conversion two-absorption sulfuric acid making technology，the features of sulfur slurry produced by FR desulfurization unit,process gas and the main problems found during operation and corresponding solutions are introduced.This technology is technically evaluated in this paper.

Two typical HPF desulfurization processes are introduced,and improvements have been made for high tower regeneration process and jet-oxidation regeneration process.These two processes are compared in the aspects of investment, energy consumption,land occupation and operation stability.The result shows that high tower regeneration process has the advantages of good regeneration effect,high operation stability,while jet-oxidation regeneration process has the advantages of less investment and land occupation.

After a long time study of the acidity and temperature of ammonium sulphate mother liquor,improvements are made on the preparation of the mother liquor by stopping the gas pre-heater,and utilizing the recycled hot water.With such improvements,the steam consumption is reduced,the ammonium sulphate quality is improved and the output is slightly increased.

The problem of blockage in the tail gas pipeline of tar distillation vacuum system is analyzed,and it is found that the main reason for the blockage is ammonium salt.By replacing the washing liquor methylnaphthalen with warm water,and improving the operation conditions,the problem of blockage in the tail gas pipeline of tar distillation vacuum system is solved.