By analyzing the reactivity of metallurgical coke in different areas of blast furnace,a new understanding is concluded on the thermal property of metallurgical coke.It indicates that the current measuring method for coke reactivity and CSR is not suitable for blast furnace simulation.A more reasonable measuring method is discussed to stabilize blast furnace operation and control the coke quality properly.

Ash composition in coking coal is analyzed in this paper,which can be used as a reference for procuring and using the coking coal,and can allow an optimization of coal blending ratio,reduction of alkali metal in coke,stabilization of coke quality and improving hot strength of the coke.

In this paper, processes of CMC and pre-drying for gasification are introduced and comparison is made in aspects of process flow and auxiliary facilities.

A method of evaluation on cost performance of coking coal by using mathematical model is introduced.The cost performance is calculated in a mathematical model,according to which sequence can be arranged for the evaluation so that the superior coking coal can be selected and the inferior one can be eliminated.Therefore,the procurement cost and blending cost can be dramatically lowered.

The NOx generation mechanism of heat recovery coke oven and normal coke oven is introduced. The waste gas of heat recovery coke oven contains less NOx, and can be discharged directly, so heat recovery coke oven is more environment friendly than normal coke oven.

Safety precautions and accident preventions are introduced in this paper against risks in 7.63m coke oven operation,such as mechanical injury,gas poisoning,explosion,etc..Solutions and improvements are proposed regarding to the potential risks in production,such as lining bricks damage in the ascension pipe,gas leakage in the cellar,and optical fiber problem in the elevator,and so on.

Introductions are given for the configuration of hot coke emergency water spraying system and selection of water feeding control valve.Optimization is also done based on the original piping arrangement and water feeding system to protect belt conveyor against damage which may occur due to excessively high temperature of the not well quenched coke so as to ensure safe production for the CDQ system.

Design deficiency of adjusting structure for the existing side pressurizing spring for oven door knife edge is analyzed in this paper and an optimized knife edge cap spring structure is introduced.Tar jamming and rust occurred in screw plug and the screw thread can be avoided so that easy routine maintenance is possible at low cost and in an environment-friendly way.

The factors causing excess error of coking repeatability test is analyzed.It is found that the main factors are coal blending and coke quenching.Methods for reducing the error are provided.With adoption of improvements on operation,the error is controlled within the required standard.

By installing an auxiliary heating system for the end flue of 7m coke oven,the problems of hot coke adhering on the bucket,poor uniformity of coke quality,too much smoke when lifting oven door,and high heat consumption during coking caused by low temperature of end flue are solved.This system has the advantages of less investment and simple operation.The improvement is remarkable,so it has promising potential for market development.

On the basis of blending more anthracite for coke making,a 40kg pilot coke oven is used to study the optimum coal blending ratio to produce coke with high CSR.The result shows that with 30%~40% anthracite and 50%~55% coking coal and fat coal blended,the stamp-charging coke oven can produce coke with CSR higher than 60%,and both the mechanical strength and CSR of coke meet the requirement of first class metallurgical coke.

Analysis is made for the change of water quality before and after wet quenching by testing different waste water sources.The result shows that a finite concentration of waste water used as wet quenching source can not only ensure a stable operation for the quenching process，but also minimize the pollutants in the waste water，which is proved a better solution than using clean fresh water.

The content of cyclopentane in the byproduct of hydro-refining-non-aromatic hydrocarbon is very high,which is about 33% by weight.First the cyclopentane is extracted from the non-aromatic hydrocarbon,and then the impurities are removed by molecular sieve and activated carbon to obtain high purity cyclopentane.

The problems of vacuum potassium desulfurization and acid-making process introduced and analyzed. After improvement on the process,the problem of tail gas pollution is solved,and the negative influence of waste alkali after desulfurization to the waste water treatment system is avoided.

Based on the analysis of heat exchange network of tar distillation system,the pinch temperature is worked out with pinch technology.The operating status of the heat exchange network can be evaluated in a scientific way.The heat exchange between cold and hot materials is optimized to improve heat exchange efficiency.The annual cost can be cut down by 830 000 Yuan.

A method to prepare isotropic coke using coal pitch as raw material is introduced.The process combines the pretreatment of isotropic coke and anisotropic coke.This method mainly lies in the preparation of raw materials and selection of coking process data.

The process of phenol-cynaide-containing waste water treatment in coking plants is introduced.The reasons for the high ammonia nitrogen concentration in waste water after bio-chemical treatment of phenol-cynaide-containing waste water are analyzed.Based on the analysis result,improvement measures are taken,after which the ammonia nitrogen concentration meets the design requirement.

The difference between heat supply unit and full condensing unit is analyzed.Advice is provided for cold end optimization.Cold end optimization of the heat supply unit shall consider heating season and non-heating seasons repectively.The influence of backpressure on heat consumption during heating season is less,so the designed backpressure shall be determined based on the climate conditions of non-heating seasons,cold end arrangement and running time of the unit.
Co-generation of heat and power; Heat supply unit; Designed backpressure

Process optimization is made to solve the problems of high resistance in the system,poor product appearance and frequent maintenance during the production of ammonia sulfate with the saturator.After optimization,the product quality is improved,maintenance frequency is reduced and the system resistance is lowered,The result is as good as expected.

The current utilization of coking steam condensate is introduced.Several energy saving measures are taken to recycle the condensate for comprehensive utilization.The energy saving result is remarkable，and the operation environment is improved.

Three ammonia vaporization processes,liquid ammonia vaporization,ammonia liquor distillation and concentrated ammonia liquor vaporization,are introduced and compared with respect to process features,project investment,media consumption and operating cost.It provides a reference for selection of ammonia vaporization process.