Different proportions of steel slag were added to coking coal to produce coke.Thermal property of coke produced was studied.The result showed that coke reactivity increased with the addition amount of steel slag until it reached a saturation point,while the coke strength after reaction decreased continuously.Specific surface area and SEM study showed that higher reactivity resulted in bigger pore size,which may link up each other,and consequently the specific surface area and coke strength after reaction were reduced.It was also observed that steel slag particles were uniformly distributed in coke.

This paper introduces the present situation of coking benzene refining process in China,analyzes the features of different processes with respect of solvent,compares the effect of NFM and SUL-COS in extractive distillation process,and provides suggestion on process selection.Extractive distillation process is more suitable for coking benzene refining for its advantages of low investment,less equipment unit,lower pollution risk,high recovery rate and production purity,less energy consumption and operation cost,and good adaptability of raw material.

One of the main reasons why the pollution discharged from stack of coke oven battery exceeds the limits regulated by environmental protection standard is the leakage of raw gas from oven chamber to heating wall with going through micro cracks of the chamber wall.Therefore to keep tightness of the oven walls during long period of operation is the important condition for the oven battery to reach the environmental protection level required by the standard.The RPR-SL technology is a kind of “precise maintenance and repairing” technology of the oven chamber which can effectively diminish the micro cracks of the walls causing the leakage of the raw gas.It is also regarded as the technology eliminating pollution sources to reduce the pollution discharged from the stack of the coke oven battery.

In this paper,the coke thermal property is expounded,and the impacts of alkali metal,alkali-earth metal,zinc,lead and chloride on the coke thermal property are analyzed.Furthermore,some measurements are proposed like improving the coke thermal property and standardizing the operation of blast furnace,which will be instructive for the blast furnace to operate stably and trouble-freely.

Influence of petroleum coke on caking property of blended coal and coke property was studied through research on the features of petroleum coke and coal blending and coking experiment.The result showed that addition of petroleum coke will reduce the caking property of coal.Using of petroleum coke added coal for coking will reduce coke ash content,increase sulfur content in coke,reduce the cold strength and increase the hot strength of coke.

Take the actual production data of the 6m coke oven and the 2 800m3 blast furnace as objects,the paper studies the impact of sulfur content in the coke on the quality index of coke,the operation index of blast furnace and the quality index of molten iron,meanwhile,it discusses the comprehensive influence of the change of sulfur content in the coke on the cost of the coke and the cost of the molten iron.

This paper describes the calculation method of pressure drop and temperature drop of main steam of CDQ boiler system.Based on the different distances between CDQ boiler and turbo generators, the pressure and temperature of main steam at the outlet of CDQ boiler is calculated.It is found through comparison that pressure drop and temperature drop can be reduced by shortening the distance between CDQ boiler and turbo generators,so as to increase economic benefit.

Based on coke oven heat balance calculation,the relationship between excessive air coefficient and coking heat consumption is analyzed.Heat taken away by waste gas increases if the excessive air coefficient is too high,resulting in higher coking heat consumption.Combining with the data measured at site,a rational oxygen range contained in flue gas is worked out to realize complete combustion of gas,and fulfill the purpose of energy saving,environment protection,economic beneficial,low coking heat consumption and higher production capacity of coke oven.

Through introducing the present storage form of feed coal in the coking plants,this paper mainly considers several aspects such as the ratio of coal tonnage investment,the investment recovery time,the generated economic benefits by adding some weatherproof measurements,as well as the covering area,thus instructing the coking enterprises,in accordance with their own conditions,to choose the right suitable storage facilities of feed coal.

Coal injection experiments with different oxygen enrichment and different proportions of de-dusting ash show that the combustion rate of blast furnace PCI coal doesn’t change so much with addition of de-dusting ash up to 5%.In actual application，addition of 1.3% de-dusting ash brings about less influence on blast furnace indexes，but remarkable economic and environmental benefits.

This paper introduces the corrosion mechanism under the insulator of coking equipment and analyzes its effect factors as well as the protective measurements，in which the metal-protective coating is the most basic measurement，and additionally proposes the application of thermal insulating coatings to the coking equipments.

This paper analyzes the reason why the 5.5m stamp-charging coke oven has bad effects of charging emission control,and then the corresponding improved measurements are adopted.In addition,some notes during the system operation are put forward.After the improvements,the effect of emission control during coal\|charging is improved,and the phenomenon of yellow smoke emitting from the pusher side during charging is completely eradicated,and the maintenance of ascension pipes and smoke abatement devices is reduced as well.

In order to meet the requirement for recycling of treated coking wastewater,methods of flocculation and microwave-Fenton are combined to treat coking wastewater.The influence of dosing H2O2 and Fenton agent for several times and influence of combination dosing of flocculation and microwave-Fenton on coking wastewater treatment are studied.Based on the comparison between several processes,it shows that the effect of flocculation-microwave-Fenton method is obviously better than flocculation and microwave-Fenton.The optimum combination order is flocculation before microwave-Fenton.

This paper makes a comparison between positive and negative HPF desulfurization processes with respect to process features and economic benefit as well as process equipment,product,raw material and consumption indexes.The result shows that these two processes are similar in operation cost,but positive HPF desulfurization is more economic with regard to construction cost,therefore,positive desulfurization process is broadly adopted in coking industry.

This paper describes the wet desulfurization technology taking ammonia，which is contained in the gas，as alkali source and OMC-hydroquinone as catalyst.Production practice shows that this technology is very effective in desulfurization，and produces no wastewater.It is a clean production technology.

This paper introduces the design parameters of ammonia liquor circulating system of 7.63m coke oven,design of emergency system,ammonia liquor process flow,main equipment and problems found during production,discusses the compilation and implementation of maintenance scheme of ammonia liquor circulating system,production adjustment of coke oven,balance of cooling water,and prevention and control of production and environmental protection risks.

Pitch samples are molded by cold inlaid resin，and then grinded and polished by automatic grinding and polishing machine with different size grade waterproof sandpaper.The samples are observed and measured by reflection type polarizing microscope.Mesophase content is obtained through area percentage method.This method can not only avoid the influence of mesophase size，but also measure the proportion of different sizes of mesophase.

This paper introduces some engineering examples of advanced treatment of coking wastewater after biochemical treatment.Considering the features of biochemical tail water,a new treatment process combining pipe chute sedimentation,primary filtration and resin absorption is proposed.The removal rate of chromaticity,total cyanide content and suspended solid of tail water after treatment are 89.7%,88.1% and 69.6% respectively.The indexes of discharged water are better than that specified in Emission Standard of Pollutants for Coking Chemical Industry GB 16171—1012.This method has good application prospect.

This paper introduces the working principle of horizontal spiral centrifuge.Its application in the sludge dehydration treatment of coking wastewater shows that the centrifuge has the advantages of high capacity，high automation level，simple maintenance，clean and pollution free and low cost，so it is worthy of popularization.

With regard to the problem in conventional tube furnace that waste heat in tail gas is not recovered for reuse，a new technology is developed to recover and reuse the waste heat of tube furnace tail gas.Under the precondition that the quality of ammonium sulfate meets technical requirement，through process modification of tube furnace and equipment of ammonium sulfate production system，the waste heat of tube furnace tail gas is comprehensively used，process energy consumption is reduced，and environmental condition is improved.

This paper briefly describes the application of closed-circuit circulating cooling system in gas purification system，analyzes the system process arrangement，process features and existing problems，and puts forward improvement measures to keep stable production. Closed\|circuit circulating cooling system helps to reduce new water consumption per ton coke in coking industry，which brings about huge economic benefit.