The 1/3 coking coals from Henan and Shandong are analyzed and compared.The result shows that blending of Henan A mine is good for the fluidity and dilatation,and the coarse mosaic texture is much more than Shandong B mine.The coking microstructure of single coal of 1/3 coking coal in B mineral is mainly fine mosaic structure.Higher blending ratio of it will worsen the coke quality.For the coking coal with similar caking index and maximum thickness of plastic layer,that with better fluidity and dilatation properties is good for the improvement of coke quality.

By comparing the coal properties and result of blending fat coal from Shangdong A mine and Shangxi B mine,it is found that the volatile matters,fluidity and fine mosaic structure for coking of fat coal from Shangdong A mine are higher.Blending of it within certain range of ratio is good for improving the abrasion resistance of coke,but too high percentage of it will weaken the hot strength of coke.The fat coal from Shanxi B mine has more coarse structure for coking,but its fluidity is poor.Less blending of it is not good for the abrasion resistance of coke,so the coke abrasion strength can be improved by increasing its blending ratio or blending a certain amount of gas fat coal.

The fine intelligent coal blending system is introduced.The pilot test and industrial test results show that the quality of coke produced from coal blend with a proportion ratio provided by the fine intelligent coal blending system meets the production requirement.Coal blending cost is reduced.It is suitable for the prediction of different oven types,and the prediction result is precise.

The proper and process equipment of CDQ are improved and optimized by increasing the volume of prechamber,adopting double flue technology,improving the performance of refractories,optimizing the charging device,modifying the secondary de-duster and optimizing the crane system.After improvement,the temperature of discharged coke is reduced to 140℃,the utilization rate of waste heat is increased,and coke supply to the blast furnace can be ensured.

Based on the coke quality data of Shaogang in 2016,the coke quality prediction model was established with data analyzed and treated by regression method.This model is applied in the production and sale system developed by Shaogang,so that the coke quality can be automatically predicted.This provides a theoretical basis for optimizing coal blending structure and decreasing coal blending cost.

Coke sample was taken from the air inlet of the 2 500m3 blast furnace in Shagang.The ash content,grain size,optical texture,degree of graphitization,reactivity and maximum bearing pressure were determined.The quality of the coke at the air inlet and the coke charge was compared.The study shows that the smaller the grain size of coke at air inlet,the higher the reactivity and degree of graphitization,the abrasion of the surface texture of the coke at the air inlet is more serious,the reaction layer is thinner,the compression strength doesn’t change,surface abrasion resistance is lower and the surface is easily pulverized.

Coal blending & coking test is carried out with a 40kg pilot coke oven,which can provide the optimum coal blending ratio as a guidance for coke production.In case the coal source is not stable,and there is a shortage of good quality coal,the pilot coke oven can provide sound foundation for optimum coal blending and comprehensive utilization of coal resources.

The current status of coke burning loss of the coking system is introduced,and a method is proposed to determine the coke burning loss of the coking system and CDQ system.The coke burning rate can be reduced and economic benefit can be increased by improving the tightness of the system and optimizing the process operation conditions.

This paper points out the disadvantages of conventional way of breakdown compensation for JN60-6 coke oven battery,and proposes a new method for breakdown compensation,i.e.alternate wet and dry coke discharging method,which can improve the compensation efficiency and the output of coke and reduce energy consumption.It provides a technical reference for the production recovery after maintenance for coke oven batteries of the same type.

The fixing rod of fixing cup of PROven system of 7.63m coke oven has broken several times，causing negative pressure in the coking chamber.As a result，the system cannot be controlled automatically.Through study and analysis，it is observed that the main factors causing the breakage is abrasion and corrosion.After improvement，the fixing rod is more stable，with slight vibration and less abrasion.The problem of fixing rod breakage is effectively avoided.

The reason for the vibration failure of CDQ circulating fan is analyzed through frequency spectrum.It is found that the failure is caused by unbalanced rotor.The rotor is timely replaced，and during the replacement，it is found that there are many abrasions and cracks at the root of rotor blades.This verifies the judgement for the previous failures.Therefore，more serious accident such as broken of rotor blades can be avoided，and the purpose of predicative maintenance can be achieved.

The dynamic pilot test of coke oven battery shows that with adoption of salt bath coil structure,the inner wall surface temperature of  heat absorber on the ascension pipe of coke oven battery can be controlled,and the tar vapor contained in the raw gas will not condense.During the whole coking period,the inner wall surface temperature of heat absorber,total heat exchange coefficient and the radiation heat exchange coefficient of the coking chamber are stable at the early stage,and decrease at the late stage.The radiation heat exchange coefficient of raw gas and the radiation heat exchange coefficient of the coking chamber decrease as the height increases.

The water condensing system and direct air condensing system for turbine power generation are introduced, and the operation parameters of turbine power generation station in CDQ project are analyzed.The two systems are compared from the aspects of generation capacity,power consumption, investment,land occupation and running cost.

Generally double-loop water feeding system is adopted for supply of boiler feed water.The advantages and disadvantages of double-line feed water system and single-line feed water system are compared.Some suggestions are provided to adopt the single-line feed water system.

The process of waste heat recovery and utilization from the waste water of CDQ boiler is introduced.With adoption of this process, the problem of deformation and cracks on the water seal tank can be effectively solved.Therefore, the service life of water seal tank is extended, and the production cost of CDQ is reduced.It is an effective way to save energy and reduce waste discharge.

The classification of coking waste gas and corresponding treatment technologies are introduced. The advantages and disadvantages of different treatment technologies are described in detail, and suitable suggestions are proposed based on practical engineering experience to improve the technologies.

An online repair method for the broken shaft of oven door service car is introduced.Online repair has the advantages of short repair time and high efficiency.It can greatly reduce the production cost and bring remarkable economic benefit.

Coke oven gas is an importation energy and chemical raw material.The current general utilization of coke oven gas is introduced.It is proposed that coke oven gas polyregeneration is one of the methods to fully make use of coke oven gas and maximize the economic benefit.

The principle and application of a new catalytic oxidation desulfurization process is introduced.Compared with other desulfurization processes,it has the advantages of good desulfurization effect,less consumption of desulfurizer,and no secondary pollution.

By simulating the phenol removal process in the laboratory，the influence of reaction time，reaction temperature，density and flow of NaOH on the dephenolization efficiency，the influence of settling time on neutral oil content in phenol salt，and the influence of different light oil on the washing result of phenol salt are studied.Based on the result the optimum process conditions are finalized for fraction dephenolization.On the basis of experimental data and the actual condition at site，the process operation data are optimized and adjusted.After improvement，the dephenolization efficiency of phenol oil，naphthalene oil and washing oil is increased by 3.7%，2.6% and 4.9% respectively.The neutral oil and free alkali are decreased by 48% and 37% respectively.

The number of cooling is an important factor in the thermal calculation of cooling tower.The study shows that the number of cooling is closely related with environment,climate,supply water temperature and water temperature at outlet.It has nothing to do with the parameters of packings,circulating water flow or ambient atmosphere.

Coal tar is normally processed under high temperature.The temperature of recovered anthracene oil is up to 220℃,so it is very important to tightly seal the pump.After studying the sealing method and implementing renovation to the anthracene oil pump,the pump shows good performance.

As the raw oil has been at a low price for a long time,the coal chemical hydrogenation plant is facing the problem of deficit as soon as being put into operation.Based on the analysis of industry and enterprise condition,the products of coal chemical hydrogenation plant and purchase of raw materials are expatiated,and the suggestions of product differentiation and refinement and improvement on raw material purchase network are proposed.