Crucible coking experiment without coking coal is carried out by taking the mixture of Xuzhou gas coal and Zaozhuang fat coal as basic coal material,and adding coke fines,lean coal and anthracite coal of various sizes.The coke optical texture,coke micro strength index and structure strength index of obtained crucible coke are measured and tested.The result shows that with the addition of inert materials,OTI of coke increases,while I+Mf+FF decreases.Among the three inert materials,addition of coke fines is the most effective way to improve coke micro strength and structure strength.The smaller the inert material size,the better the coke quality.

This paper introduces the development of electric steelmaking in China and abroad,elaborates the development of graphite electrode and the research and development process of needle coke in China,and analyzes the international and domestic market situation and the overall trend of needle coke.It points out that research on the production process and technology of domestic needle coke shall be strengthened to improve the quality of needle coke,and investment to needle coke in oil system shall be increased.

This paper studies on technical properties of the blast furnace injection for flaming coal and its semi coke products.The result of the experience shows that grindability and burning rate of flaming coal are better than that of semi coke,while semi coke has higher calorific value,better safety performance,lower volatile,and more suitable for blast furnace injection than flaming coal.

Thermal extraction of fat coal at different temperatures and in different solvents and the properties of extracts are studied.The result shows that the extraction yield first increases with thermal extraction temperature rising,and reaches peak value at softening point,and then decreases with the rising temperature; and the extraction yield of fat coal increases obviously with solvent polarity.Thermal gravimetric and infrared analysis shows the variation of extracts structure.The feature of containing nearly no ash is expected to be the breakthrough for clean use of the coal.

A systematic analysis and conclusion have been made on the production data and phenomina such as temperature of oxidation layer in gasification furnace,fluctuation of oxidation layer,gas composition,tar yield,gas temperature and pressure at outlet of the furnace during industrial production offixed bed gasification of Huolin River lignite under atmospheric pressure,to show the particularity of fixed bed gasification of Huolin River lignite under atmospheric pressure.

This paper introduces the negative influence and energy saving effect of the third generation coal moisture control technology to coking and gas purification system,analyzes reasons and proposes solutions.

This paper analyzes the advantages and disadvantages of traditional coke cake center temperature measurement and modern automatic coke cake temperature measuring system.As to the difficulties in coke cake center temperature measurement of 7m coke oven battery,it is recommended to adopt horizontal tube inserting method to measure the coke cake center temperature,which has been applied to large scale coke oven battery successfully.

By comparison of old and new technologies in waste gas flue heat exchange,with description of waste heat recovery unit and by analysis of economic benefit for the new technology,the waste heat recovery unit from coke oven waste gas flue is highlighted in this paper,which is characterized with lower investment,short payback period,lower operational & maintenance cost and a remarkable economic benefit.

With the study on each individual coal quality，coking characteristic and coal fineness，and with reference the data obtained from 40kg pilot coke oven battery and quality requirement to coke of 1 750m3vanadium-titanium blast furnace，6.25m stamp-charging coke oven battery is undergone industrial demonstrating test.An optimum and economic coal blending structure for vanadium-titanium blast furnace is proposed，which can fully play the advantage of stamp-charging coke oven battery.

This paper introduced the causes of damage of water seal tank for CDQ and its improvement method.Although improved water seal tank accumulates a thicker fouling,the overall structure has not suffered from any substantial change,with service life over four years.

The reasons and main influencing factors for the black smoke discharged from the chimney of stamp-charging battery,and corresponding measures such as optimizing operation,narrow the coal bunker and adjusting coal blending structure and so on are taken.As a result,the pushing current is reduced to 105～120A from 150～170A,and no black smoke is discharged from the chimney any more.

This paper introduced a new technology for socket joint of ascension pipe by sealing with medium\|temperature pitch,which has successfully been used for four 6m coke oven batteries in terms of improving operating environment and a remarkable economic benefit by 330,000 RMB yuan all year around.

The autotrophic nitrobacteria Z2 is isolated from the activated sludge in the coking waste water treatment system.The strain Z2 nitrification effect can reach up to 100% after four days in culture medium.The optimized nitration conditions of this strain are tested pH 8.0 with shaking speed of 250rpm at 30℃ under different circumstances of temperature,initial pH and shaking speed.The research on different inoculation amount shows that increase of inoculation would benefit nitrification because the nitrification of the tested strain can not be inhibited when the concentration of nitrite nitrogen is increased from 101.51mg/L to 507.55mg/L.Furthermore,the increasing culture medium pH during the nitrification could be beneficial to the nitrification in theory.

This paper studies the influencing factors such as microwave processing time，microwave power，FeSO4 dosing amount，H2O2 dosing amount，H2O2 dosing times and pH value during coking wastewater treatment by Microwave-Fenton oxidation.The optimum process conditions are determined by the experiment：pH value of wastewater：3，FeSO4 dosing amount：300mg/L，H2O2 total dosing amount of H2O2：900mg/L，H2O2 dosing times：3，microwave power：500W，temperature：50℃，reaction time：30min.the removal rate of turbidity，chroma and COD are 97.59%，95.62% and 86.21% respectively.The wastewater after treatment is clear，and the remaining COD is 50.34mg/L.The turbidity，chroma and COD meet the requirement of industrial recirculating water standard.

This paper described a method to control the secondary salt concentration from echanism the secondary salt in desulphurization and analyzed the factors affecting the concentration of the secondary salt in real desulphurization production by HPF,such as solution pH value,volatile ammonia content and catalyst concentration,etc..

As the QI content in coal tar and pitch of Meishan branch appears lower than normal，this paper introduced a solution that a blended oil and/or the coal tar with high QI content bought from outside the company are used to increase the QI content in the pitch. This blended oil can be used to produce medium\|temperature pitch and modified pitch so that the ratio of first-grade products can be increased due to the improved QI content.

This paper introduced a new technology of waste heat recovery from gas primary cooler，by which chilled water can be prepared by recovering the waste heat from the upper stage circulating water of the primary cooler in summer and heating water can be heated up by recovering the waste heat from the medium stage circulating water of the primary cooler in winter so that the waste heat from the gas primary cooler can be fully utilized，energy consumption can be saved and environment can be improved.

This paper introduced an “anaerobic-anoxic-oxid-coagulation-sedimentation-fenton reagent process” in waste water treatment by Jinan Iron & Steel Group and also analyzed some common problems during waste water treatment，such as sludge aging and sludge poisoning，etc..Countermeasures were also given in this paper.

Refrigeration process is applied to the chilled water at the lower stage of COG cooler,and open cycle is switched to closed cycle,so that water temperature is reduced by 10~15℃,meeting the process requirement.After comissioning and start-up,cooling water flow reaches 200m3/h,CO2 emission is reduced by 12 000t/a,steam recovered by 69 120t/a,and water saved by 1 400 000m3/a.The energy saving and emission reduction effect is remarkable.

This paper analyzed the problems of Fenton catalytic oxidation method and presented suggestions in the application for biochemical waste water treatment, such as chemicals selection,dosing method,dosing preconditions,sludge scrapper running time,pH value regulation and additional baffle in coagulation sedimentation tank,etc.,which will better the quality of effluent water up to grade I of Chinese national standard.

H2S/SO2 analyzer used in sulfur recovery unit can effectively improve sulfur recovery rate,reduce the discharge of sulfide,help to save energy and protect environment. This paper introduces the working principle of H2S/SO2 analyzer,and problems found during application and solutions.

This paper analyzed the operating status of centrifugal fan under non-normal conditions and put forwarded solutions to overloaded running of the fan in winter, including precautions for the fan piping design and operation.