As a result of excessive capacity,extensive development,increasingly environment pressure and lack of innovation,the industrial structure of coking industry in China is stepping into deep adjustment period.Under the circumstance that many companies got into unprecedented difficulties,it is essential to commence an intensive research on the positive and negative factors affecting the development of coking industry,analyzing the mainstream,reforming development patterns and taking corresponding measures to improve the value integration capability,reverse the passive situation and realize sustainable development of coking industry.

Based on the survey on the utilization of coal and chemical by-product and petrochemical industry by-product and waste resources in metallurgy chemical industrial park,this paper introduces the comprehensive recycling utilization of carbon resources of petrochemical industry,coal and chemical by-product and by-product of heat and power industry,and comprehensive utilization of the by-products of different industries.This paper also analyzes the main problems existed in the development of cycling economy in the park,and proposes constructive advice on the utilization of “three wastes” in the park.

This paper introduces the structure and corollary equipment of 200kg pilot coke oven.Coking experiments were performed to compare with 6m production coke oven.The result shows that the coke quality produced by the 200kg pilot coke oven has obvious linear relation with that produced by production coke oven.This relationship can be used to guide coal blending.

This paper puts forwards the design principle and method for the backstay of large coke oven,and analyzes the joint structure between backstay and flash plate and the loading condition of backstay.Three-dimensional simulation software is adopted for static analysis of backstay.The strength and rigidity of backstay is verified to ensure enough protection force from the backstay to large coke oven proper.

This paper introduces the improvement of coal moisture control in Baosteel from the aspects of process and equipment. New problems were found after the improved coal moisture control technology was put into operation,and accordingly measures were taken to solve the problems.Afterwards the running rate of equipment increased,abnormal shutdown of dryer decreased,steam condensate was completely recovered,and dust deposition in bag was avoided.

The condition of bracing system of European 6.25m stamp-charging coke oven is introduced.The structure and features of optimized bracing system of coke oven is described in detail.After modification of the bracing system,the tightness of coke oven is remarkably improved.

With the purpose of making full use of coke soaking in CDQ chamber,measures are taken to improve the uniformity and stability of temperature in coking chamber while reducing standard coke oven temperature,provided coke quality is ensured.

Based on the features of charging emission and pushing emission of stamp-charging coke oven,different technologies are adopted to control the emissions.With the combination of hardware process equipment and fuzzy control of coke oven gas collecting main pressure,charging emission is collected,and charging emission meets the environmental requirement.

Based on the production data of CDQ system,coke burning rate is calculated by several methods.The relationship between CDQ coke burning rate and steam generation per ton coke is analyzed.The influence of reducing coke burning rate to company economic benefit can be estimated through calculation.

For the reason that imported electric cylinder is too expensive and order cycle is long for Pan Steel CDQ,a home made CDQ electric cylinder is designed and verified. It is proved that the design meets operational requirement.

When blast furnace gas is used to heat bottom regulated coke oven with checker brick structure, the suction force of sole flue must be measured and regulated.A new measurement and regulation method has been developed to achieve more accurate and faster regulation of suction force, so as to ensure uniform and stable temperature in coking chamber.

This paper analyzes the reasons for the problems existed in automatic dust discharging of primary de-dusting of 75t CDQ, introduces a series of improvement onoperation and program. After improvement, dust collected by primary de-duster can be discharged automatically and dust discharging efficiency is remarkably increased.

This paper analyzes the problems of control panel for the pneumatic actuator of coke oven gas collecting system.Corresponding solutions are proposed to improve production safety and equipment maintenance,so as to ensure the adaptability and durability of pneumatic actuator under severe working condition of coke oven.

Vertical mill is pioneeringly used for preparation of coke breeze.This paper introduces the application of WJRM-10 vertical mill in the preparation of coke breeze from the aspects of principle,process and practical operation,providing an effective method of cost reduction.

With the development of large coke oven,it is inevitable to develop large scale coke oven gas refining system.Large desulfurization unit is the key for large scale coke oven gas refining system.The running condition of F/R desulfurization unit in Baosteel Phase IV is an example of large desulfurization unit.

The chemical property and reaction principle of NaOH and KOH are similar，so the replacement of KOH with NaOH in vacuum potassium desulphurization process is successful.Such replacement ensures desulphurization efficiency and reduces production cost.

This paper introduces the process flow of extractive distillation unit in the process of crude benzol hydro\|refining,states the start-up operation of extraction distillative unit after shutdown,analyzes the factors influencing start-up,and provides proposal and process for shortening start\|up time. Improvement brings the effects of energy saving and profit increasing.

To reduce steam consumption during ammonia stripping from coal water,large hole flow\|guided sieve tray is adopted in the design of ammonia stripper.Chemical engineering simulation software is used to simulate and optimize the relationship between number of trays and steam consumption.Compared with bubble cap ammonia stripper,steam consumption per ton coal water is reduced by 30kg,ammonia content in waste water is reduced to 30mg/L from 50~100mg/L,and it is more convenient to inspect and repair the ammonia stripper.

This paper introduces HPF desulfurization process and points out the necessity of secondary salt extraction from desulphurizing waste liquor.The available secondary salt extraction processes are described and analyzed from economic point of view.With secondary salt extraction，desulfurization efficiency is increased，catalyst consumption is reduced，production cost is reduced and environment protection level is improved.

This paper introduces two heating processes,i.e.steam and heat transfer oil heating for hydro-refining reboiler,and provides solution for the problems existing in steam heating.Comparison is made with respect to economic efficiency and safety,based on which suitable heating process can be selected as per actual condition.

This paper introduces the operation data and key points for operation of tar ammonia separator.With regard to the problems found during operation,suggestions are provided to improve and promote vertical tar ammonia separator.

Experiments have been conducted to compare phosphate treatment and equilibrium phosphate treatment.The result shows that by adopting equilibrium phosphate treatment,the high temperature and high pressure boiler runs stably with higher quality water and steam,and dosing amount of secondary ammonia to boiler feed water is reduced,hidden of phosphate is prevented and chemical dosing times and quantity are reduced.

Based on the application of medium and small transformers，this paper puts forward the idea of replacing aluminum winding with copper winding，and provides the design data for the replacement for 160kVA oil filled transformer.Application shows that the technical parameters meet the production requirement，and the transformer runs well.

This paper introduces the utilization pattern of extracting hydrogen from the coke oven gas PSA and the principle of applying it to make natural gas,as well as its technological process.From the perspective of the current market environment,the method of extracting hydrogen from the coke oven gas PSA to make natural gas is promising.