This paper probes into the pyrolysis kinetic characteristics of Zhundong coal and Shenmu coal with thermogravimetric analysis method and gas heat carrier experiment,and determines the kinetic parameters by established pyrolysis kinetic model.It finds that the impact of reaction residence time on semi\|coke yield and its volatile matter decreases with increasing pyrolysis temperature; the pyrolysis activation energies of coals are related to reaction residence time and coal particle size.The study results have great significance on industrialization of coal pyrolysis process.

This paper researches the high temperature metallurgical properties of coke used in blast furnace ironmaking process under lab conditions,and also elaborates the impact of alkali metal on the high temperature metallurgical properties of coke,so that it could provide basis for improvement of metallurgical coke quality for blast furnace and selection of ironmaking coke.

This paper conducts experimental coke making respectively by top charging and stamp charging method with 6 kinds of single coal and their 4 kinds of blended coal in 2kg test coke oven,and studies the impact on coke quality.The result shows that stamp charging has increased the bulk density and improved the caking property and further improved coke quality.On condition of ensuring the coke quality,more quantity of weakly caking coal such as gas coal,lean coal and meager coal could be blended.

This paper studies the vitrinite characteristics of similar rank coking coal through density centrifugation method to separate the macerals of coal petrography,and also analyzes and compares their caking property and the features of the produced coke. The study shows that there are differences in volatile matters,caking property and inert-tolerant capacity of similar rank coals,while the difference in inert-tolerant capacity of vitrinite of the coking coals is larger,and the property of the produced coke from similar rank coal vitritite also has obvious difference.Compared with the coke produced from raw coals,the optical texture index of coke made from vitrinite is higher,while the strength and reactivity of the coke become decreased.

This paper analyzes the causes for the problems of deduster including dew formation,frequent damage of gasket for dust cleaning valve,reduced service life of filter bag and partial smoldering etc.,and adopts countermeasures including using flap type steam bushing insulation device,adding pressure reducer at inlet of deduster air bag,properly increasing fan flow,reducing emission moisture etc.,which has effectively solved the problems.

This paper introduces the purpose,system composition,model establishment and system functions of the energy saving evaluation system for coal moisture control process,and also proposes the energy saving technical index for performance coefficient and energy efficiency coefficient as well as the economical index of dynamic recycling period,which has provided scientific evaluation for the coal moisture control process.

This paper introduces the mechanism of using binder and leaning agent in coking coal blending,and summarizes the improvement effect of binder and leaning agent on coke quality.Application of blending additives for coking could improve coke quality,and there is a broad prospect for its application in coke industry.

This paper introduces the practice of Ningbo Steel in applying plastic coal briquette technology. On condition of matching the coke quality requirement,the ratio of blended waste plastic in coking coal is increased,and the coke quality is stabilized on condition of limiting the blending ratio of waste plastic. The study provides theoretical basis and industrial reference in scientific,reasonable and economical control of “white pollution”.

This paper analyzes the broken tubes of secondary superheater by Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS) and found that the high temperature sulfur corrosion is the main reason for the tube damage and further tube burst.After corresponding improvement, there is no more tube burst accident.

Experiment was carried out to study the methods of thinning the existing oven door brick and reducing heat loss on the surface of oven door.The result shows that if the oven door brick is thinned by 80mm and installed with an additional new type high temperature resistant insulating plate,maintenance of oven door is easier, heat loss on the surface of oven door is less,effective volume of coking chamber is increased and consequently coke output is increased.The thinned brick can meet the requirement of oven door.

This paper introduces the method and device for recycling the steam exhaust of deaerator. It applies membrane type condenser recycling device for recovery of the steam exhaust heat and condensate, which has realized cycling utilization of the heat and saved low pressure steam consumption,and there is significant economic benefit.

This paper introduces a determination method for waste gas circulation flow of coke oven battery.It has successfully determined the waste gas circulation flow on 7m coke oven battery respectively heated with coke oven gas and mixed gas,and the determination results show that the waste gas circulation flow is higher when heated with coke oven gas than mixed gas.

According to the characteristics curve of the pressure control valve on gas main pipe,this paper establishes a mathematical model of variables of pressure control valve.On that basis,step disturbance of the system is removed with feed-forward control method according to the characteristic of control valve and process requirement of coke oven heating system,so that the pressure of recycled gas main pipe could be stabilized at the prescribed value,and the system has been well operated at site.

This paper proposes the improvement methods based on analysis of the causes for malfunction of limit signal transmission device for coke bucket gate. The improved transmission device has removed the horizontal component force on the transmission rod and reduced frictional resistance, and the operational reliability of the device has been improved.

This paper analyzes the features of SO2 contained in coke pushing emissions and proposes the semidry desulfurization process with Na2CO3 as the desulfurizing agent for coke pushing emissions,and also elaborates the application of this technology in coke pushing dedusting system.

This paper analyzes the factors that impact the cost and efficiency of vacuum carbonate desulfurization process, and accordingly adopts corresponding improvement measures. After improvement, the desulfurization cost for coke oven gas has been reduced, and the desulfurization efficiency is improved, which has achieved the expected purpose.

This paper introduces the current status of desulfurization process for deep purification of coke oven gas. Against the evolved problems,this paper proposes process optimization and technical modification methods which has reduced system resistance and increased desulfurization efficiency,and has reduced cost up to 4 million yuan/a.

This paper proposes improvement method for sulfur foam treatment technology against the problems of high moisture in sulfur paste,serious spillage of desulfurization solution,blockage in discharge outlet and difficulty in repair.The improvement has achieved good effect,including improvement in site environment and sulfur paste quality,obvious reduction in production cost and labor strength.

Hydraulic test has been carried out for the new type packing,the result of which shows that the packing has features of high throughput and low pressure drop.Its application in gas sulfur removal unit brings out higher desulfurization efficiency and good anti\|clogging performance.

This paper establishes a separation and determination method for o-cresol,m-cresol and p-cresol with capillary gas chromatography.The peak area and concentration of o-cresol and m-cresol have linear relationship in the range of 2～200g/L,and the relative standard deviation is respectively 1.84% and 1.67%; the same of p-cresol has linear relationship in the range of 2～200g/L,and the relative standard deviation is 1.63%.The determined recovery rate of them are all between 96.4%～103.8%.

This paper introduces the calculation of fire separation distance between the flare and equipment in coking plant.First the horizontal distance between the point which subjects to the strongest flame heat radiation and the center of flare shaft,based on which the fire separation distance between the flare and equipment can be worked out.This provides design basis for the reasonable arrangement of these two units to avoid damage of equipment caused by heat radiation of the flare.

Based on analysis of the contents of waste gas from tar processing,this paper proposes methods including increasing wash oil cooler and changing baffle plates with packings to improve the recovery rate of waste gas; the unabsorbed waste gas will be sent by fan to the heating furnace for combustion so that the gas emission meet standard requirement.The method could remove off-odour and greatly improve operation environment at site.

This paper has made attempts to successfully solve the problem of low spray atomization of ammonia liquor and smoke emission during coal leveling through modifying the length,outlet diameter,spray angle and spray pressure of the ammonia liquor spray nozzle. After applying the new nozzle,the pressure at the spray nozzle has been reduced from 3.5MPa to 2.5MPa,which has created annual economic benefit of 1.2 million yuan.