This paper introduces the compilation background of the new standard YB/T 4494—2015“Technical specification of mechanical sample preparation for measuring coke reactivityindex and coke strength after reaction”,and determination of main technical indexes.Comparison is made between this standard and ISO 18894:2006 and GB/T 4000—2008.Theimplementation of this standard will further improve the reliability of coke quality testing and data.

H2 and methane gas are obtained through coke oven gas (COG) purification process.Methane is first compressed to compressed natural gas (CNG),and then further liquefied at -196℃ to liquefied natural gas (LNG).Through economic and technical analysis on the technology of H2 and LNG preparation by COG purification,it can be concluded that comprehensive use of COG is a new development direction.

Gasification reaction tests with CO2 are carried out for coke of three grain sizes,and corresponding gasification reaction characteristic data are obtained.The tests show that the gasification reaction characteristic data of coke breeze less than 0.074mm are not related with CRI,so it can be used to evaluate the chemical reactivity of coke matrix only,and cannot be used to evaluate the gasification reaction characteristic of coke; the gasification reaction characteristic data of 3~6mm coke are related with CRI,so it can be used as the index for evaluating the gasification reaction characteristic of coke.

Gasification reaction tests with CO2 are carried out for coke of three grain sizes,and corresponding gasification reaction characteristic data are obtained.The tests show that the gasification reaction characteristic data of coke breeze less than 0.074mm are not related with CRI,so it can be used to evaluate the chemical reactivity of coke matrix only,and cannot be used to evaluate the gasification reaction characteristic of coke; the gasification reaction characteristic data of 3~6mm coke are related with CRI,so it can be used as the index for evaluating the gasification reaction characteristic of coke.

The structure of the expansion joint at the inlet and outlet of CDQ primary de-duster is modified to improve the service life of the expansion joint,reduce the replacement frequency and difficulty,and reduce the cost of expansion joint,so that the CDQ chamber can be operated stably for a long term.

This paper introduces the CDQ heating up plan with hot coke after annual overhaul，and analyzes the problems occurred during heating up. Heating up with hot coke can ensure uniform temperature rising of all the temperature control points in the CDQ chamber，so it is worthy of spreading.

The reflectance distribution of coal vitrinite and maceral in the coal maceral analysis are used to identify different coals and evaluate coal quality，so that the monitoring ofcoal sources is strengthened.It is a strong technical support for optimizing coal blending structure.

This paper analyzes the reason for the blockage of 140t/h CDQ cooling sleeve during operation.Through physical and chemical analysis on the slag,the reason for slag forming was found out.The problem of slag formation in the cooling sleeve was solved by optimizing the field operation and management.

Studies show that during coking,for coking coal with different metamorphic degree,the initial separating out temperatures of sulfur are different,the variation rules of total sulfur and organic sulfur are the same as the temperature changes,and the desulfurization rates from iron sulphide are the same as the temperature increases.To control the sulfur content in coke,coal with high sulfur content shall be properly used for coking based on sulfur content of various form and the desulfurization rule of organic sulfur during coking.

The absorption process of alkali metal salt by coke at the top part of blast furnace was simulated.Based on the coke sample analysis, the comprehensive influence of alkali metal salt and alkali metal to the thermal properties of coke was determined.In addition, the relationship between coke and alkali metal is analyzed in this paper.

Based on heating up process of coke oven battery and the NOx formation conditions during the combustion,the main factors causing the generation of NOx during heating of coke oven battery are analyzed. A NOx control technology based on LSSVM and genetic algorithms is proposed.

Damage of the water seal tank at the inlet of CDQ chamber will influence the safe operation of CDQ chamber.The problems of coke breeze settling in the water seal tank, high temperature resistance and abrasion resistance of the working surface are studied and corresponding measures are taken.The service life of the water seal tank is prolonged in practice.

Regarding to the problems of high temperature at the installation position,difficulty in maintenance and low adjustment accuracy of the actuator in CPS system,improvements have been made by changing the position of actuator and installation of connecting bar. Maintenance is less difficult after improvement,and the service life of CPS system is prolonged.

The polymerization performance of medium temperature pitch was studied through experiment.In the actual production,various medium temperature modified pitch can be produced by polymerization method through proper control of reaction temperature,polymerization time and vacuum pressure.

The automation level of spray type saturator is low,so acid adding and mother liquid making up to the saturator are carried out manually.This paper introduces a design for automatic making up of mother liquid by overflow trough which is controlled by DCS,so as to realize automatic making up of mother liquid to the saturator.Therefore the production efficiency and stability are improved.

The factors influencing the absorption of active carbon were analyzed through experiment. Through the regeneration test of waste active carbon，the factors influencing the regeneration of active carbon were determined.

This paper studies the influence of gas temperature，mother liquor acidity and density on ammonia content in gas after the saturator.It is observed that gas temperature and acid adding show great influence on ammonia content in gas after the saturator.To reduce ammonia content in gas after the saturator，gas temperature shall be reduced as much as possible，and the parameters of mother liquor shall be stabilized quickly during acid adding.

This paper describes the problems found in the crude benzol refining process with the technology of low temperature gas phase hydrogenation and extractive distillation, and proposes corresponding measures.The technology of low temperature gas phase hydrogenation and extractive distillation can reduce the sulfur content in product, and improves product quality and recovery rate.

The influence of gas flow, circulating wash oil flow and packings to the resistance of benzole scrubber is studied.Effective measures are proposed and taken by rationally controlling the flow of gas and circulating wash oil，improving the quality of circulating wash oil，and preventing blockage of packings.As a result，the recovery rate of light benzene is increased.

This paper introduces the application of advanced oxidation process in treatment of vacuum potassium carbonate desulfurization waste water.The optimum proportion of oxidant is determined.The experiment shows that COD removal rate is higher than 60%, which meets the biological and chemical indexes for discharging.

As more light tar and less heavy tar are generated under low temperature carbonization,there are some defects of vertical tar ammonia separation tank in the low temperature carbonization process. Regarding to these defects,proper height is discussed for separating light tar,and improvement design for liquid inlet,emulsion,recover pipe and inspection pipe for heavy tar is proposed.

Regarding to the problems of air pollution and high cost in the reuse of crude benzol residue in coal blending,recovery and utilization of crude benzol residue can be realized through technological modification,which brings stable production and considerable economic benefit.