The paper makes brief description of background, principle and outline of the standard on coke oven emission of air pollutants regulated by U.S. Environmental Protection Agency. It is suggested to use the technical philosophy contained in EPA’s standard，such as to promote controlling of emission sources by advanced technology, more severer limitation of emission being enforced with progress of technology and so on, as reference for improvement of coke oven environmental protection standard of our country.

The development status and present situation of CDQ technology in China was reviewed and analyzed; the economic effect which was produced from CDQ system built and under construction was predicted. The problem existed in the development of CDQ technology was found. CDQ technology in China has been reached to the international leading position, CDQ technology and equipment have been reached to domestic production, CDQ system also is developed to the seriation, macro-scale operations technology and optimization, and the important technology breakthrough has been realized, but at the same time the problems of defect, lack of the unified industrial coordination management, construction corollary and imperfect of competition system were existed. 

The energy saving and discharge reduction technology between high-capacity coke oven and stamp-charging coke oven was analyzed. After the disposal mode of high pressure ammonia liquor injection in single collecting main and the combination of de-dusting charging car and stationary bag-house unit for 7m high coke oven was adopted, the gas discharged can meet the requirement of environmental protection. The PROven system is used for 7.63m high coke oven and in combination with the charging car, its effect is equivalent to high pressure ammonia liquor injection + stationary bag-house unit. If 6.25m stamp-charging coke oven adopts high pressure ammonia liquor injection device, double U shape emission transfer car, oven door sealing device and oven end emission suction device on pusher side, the emission escaped can be controlled to maximum extent.   

The foreground and superiority for developing stamp-charging coke oven in the northeast area are analyzed in detail from the aspects of stamp-charging coke oven distribution, the resources features of the coal for coke-making and climatic conditions and so on in the area. Liaoning area has the priority of the full utilization features of coal resource for coke-making in northeast area and north China and location superiority and is more adaptable for developing stamp-charging coke oven, especially the large-scale stamp-charging coke oven. The coal with high volatile matter can be added in the coal for stamp-charging coke-making to generate large amount of gas to moderate the problem of short supply of gas in Liaoning area and this has an important significance.

The main composition and various control functions of the automatic control system of large-scale continuous vertical retort are described. Aiming at the problems of low equipment level, low efficiency of manual operation, high labor intensity, poor operation environment etc. of the existing vertical retorts, the WebField ECS-100 control system and AdvanTrol-Pro software package are used to realize the monitoring and control of the process and interlocking operation of the equipment. The operation of the system has made a favorable probing for the standardization of the automatic system design of large-scale vertical retort.

The compensation condition, compensation method, selection condition and precaution of temperature measurement on top of coke oven regenerator were described. When the temperature measurement on top of regenerator is required to be compensated, the compensation proposal of temperature measurement on top of regenerator is selected by compensation of lateral temperature and longitudinal temperature uniform factor. For oven number with better uniform factor of lateral temperature, hetero-side compensation method is selected, for others, homo-side compensation method is selected.                            

The burning process of gas in the vertical flue of coke oven belongs to the diffusion combustion, the diffusion combustion is beneficial to the vertical uniform heating of coke oven and to reduce energy consumption. The height of flame produced from diffusion combustion was calculated in the paper, the influence of blast furnace gas heating and coke oven gas heating and the influence of waste gas circulation on flame height were compared. At the same time the factor of influencing flame height was also analyzed and the problem of coke oven vertical heating was solved.   

The development process of coal moisture control technology was introduced, the difference of three generations of coal moisture control technologies was compared, the change of coal handling process due to the addition of coal moisture control system was discussed, it provided a reference for design selection. Four implementation proposals, namely coal moisture control with hot oil, coal moisture control with steam, coal moisture control with pneumatic classification were analyzed and compared, the issues to be cared in engineering application were given.      

An introduction is given to the application of LonWorks field bus in the monitoring system for coke delivery belt conveyor. LonWorks field bus is not only arranged into bus structure, but also can adopt free topological structure. It is especially suitable for the fork belt conveyor system. LonWorks field bus is characterized by long distance control, flexible control structure and configuration, high transmission reliability of bus network, high ratio of performance and price and stable and reliable network performance.
 

On the basis of the production indexes of the ammonia stripping system in phase III project in Baosteel, the process simulation and study are carried out. The simulated result tallies with the production indexes and are reliable. The soda adding amount, soda adding location and steam consumption are optimized. It is put forward that when production is expanded in phase III project, the amount of soda addition is 350kg/h, the location for feeding soda is the nineteenth column tray and steam flow rate is 10 300kg/h.

The Gas phase chromatography measurement method for phenols product composition is established. Phenols products are analyzed with 4 kinds of capillary chromatographic columns and the measuring conditions are optimized. The degree of separation for all components can reach 1.3, the accuracy and degree of precision are superior to GB/T 2601—1981, GB/T 2604—1981 and JIS standards and close to ASTM standard. The method is applicable to analyze the compositions of all coking phenols products.

Through the analysis on the composition of coking xylene, it is found that ethyl benzene and styrene is the main harmful impurity of xylene discoloration. The test result showed: the amount of acid addition should be controlled is 4.5%~5.0%,  the optimum washing temperature is 45~50℃,  and acid washing time is controlled at 7 minutes or longer. The measures of adding anti-oxidant into product, conducting secondary treatment and water washing can be taken for stabilization of product quality of xylene.