The cognizing process of the relation between coke reactivity and blast furnace ironmaking is summarized. The effect of the coke with different reactivities on the ironmaking process of blast furnace and present study situation of technological means of the production of the coke with different reactivities are expounded. Through the discussion on the adaptability of the coke with different reactivities to the blast furnace ironmaking condition, it is put forward that the suitable coke reactivity should be specified according to the blast furnace ironmaking condition and reducing property of iron ore.

The velocity field simulation of multi-tube rotary type coal moisture control process done by Fluent software. The velocity distribution of flue gas in the drier is studied and the regularity of the flue gas flow in the process of coal moisture control is obtained. A pilot test is carried out in the multi-tube rotary type coal moisture control system with a capacity of 1t/h. The test results show that under the conditions of flue gas consumption  2 000m3/t of coal powder, 245℃ of flue gas at the inlet of the system and coal moisture of 12%, the moisture of coal powder is reduced to 6.7% and requirement of coal moisture control is met.

Test for top-charge and stamp-charge coke oven batteries by 40kg test coke oven is described in this paper, which shows that the stamp-charge process can obviously improve the cold strength, crushing strength, abrasion strength and CSR of coke but it would uniformize the grain size composition since it has little effect on the CRI.

This essay discusses the influence of coking period to coke quality by changing the coking period of 5.5 stamped charging battery, provided that the coal blending ratio is constant. The result shows that by suitably extending coking period, coke anti-crush strength and coke strength after reaction can be efficiently improved, anti-wearing strength and reactivity of coke can be improved, sulfur content in coke can be reduced, and charging cost can be reduced by blending more poor coking coal.

By using the coking coal from Yunnan and Guizhou as basic coal, blended with 10%~15% Austrilian gas fat coal and 10% anthracite coal from Yunnan Zhaotong for stamp charging coking, gas production is increased, meanwhile the mechanical strength of coke is not influenced. In turn chemical product recovery ratio and methanol production are increased.

The infrared automatic temperature measuring system has been developed for the current characteristics of battery heating system. This system can measure the temperature of vertical flues exactly and make temporary adjustment to stop heating according to temperature trend. It will control heating wall temperature exactly and improve battery temperature uniform to reduce heat consumption of battery.

The coal cake of traditional stamping operation has been separated to seven layers and make strapezoid bulk density distribution of coal cake. The operation can be adjusted according to stamp work and coal filling quantity of each layer. The bulk density and stamp work of each layer are in descending order from the bottom to the top layer, and coal layers are overlapped. The stamp time of each oven become shorter to 420 seconds and 20% work capacity higher. Coal cake collapse rate is decreased from 10%~20% to 0 and charging coal moisture is decreased from 14% to 12%. The shear resistance strength and high thermal efficiency have been improved.

This paper introduces the defects of built-in type limit detector for electrical cylinder charging mechanism in CDQ system in real production, which has been replaced by a newly-innovated mechanism that shows a satisfactory performance.

A modification is done for the problems in graphite purging device, such as low availability, high failure rate, low graphite removal efficiency and graphite seriously deposited at coking chamber wall and charging hole frame, etc. due to the design and material used not matched to the actual working condition of the graphite purging device. This improvement can remarkably benefit graphite removal, pushing current reduction and hard pushing prevention.

By summerizing and analyzing the process control conditions of  6.25m stamp-charging battery such as coal belending structrue, quality of coal blended and heating schedule, this essay concludes suitable pushing current control conditions. In order to have stable operation. It is required to control the blended coal as per the follwing indexes, coking fat coal≤55%, fat coal≤10%, Vdaf≥28%, Rmax=1.11~1.17, b/a=15~30, G≤80, Y≤16.

By the compare of heat tube exchangers and water preheater work effect between the phase I and phase II CDQ of Jiu Steel, we elaborate the advantages and disadvantages of heat tube exchanger and water preheater of CDQ system.

This paper described a solution to various-degree damages to“Bracket”refractory at connecting duct of quenching chamber by utilizing β-SiC bricks instead of mullite-SiC bricks for service life extension of the quenching chamber refractory.

The principle, features and system composition of ABB industrialIT DCS control system are described in detail. The control function of DCS control system is utilized to carry out PID adjustment, cascade adjustment, ratio adjustment, adjustment in range etc., thus the accuracy control is realized and process requirement is met. The interlocking at various levels of production equipment is controlled strictly so as to avoid accident occurring. Through the rich alarm information, the analytical and decision-making basis is provided for trouble removal.

By taking p-xylene as the only carbon source and energy, one bacterial strain which has a high efficiency degradation capability to p-xylene is obtained by selection. The results of physiological and biochemical experiment and 16S rDNA gene identification indicate that the bacterial strain belongs to pseudomonas sp. Its optimum degradation conditions are pH=7.5, 30 ℃ cultivation temperature and mechanical shaker’s speed of 150r/min. The high efficiency bacterial strain is put into actual waste water and can degrade all p-xylene in it in a short time.

The production present situation of ammonia stripping system is introduced, against the problems existed in the existing process such as big fluctuation of column resistance, tar content and soda lye concentration as well as no way for automatic control of ammonia liquor deflegmator, by means of the measures of dismantling feed column plate, increase the height of outlet pipe of coal water tank, changing the soda adding mixer from the spiral type into the partition plate type, increasing soda standby pipe, realizing temperature automatic control,  the good effect has been achieved.   

By taking green vitriol（FeSO4·7H2O）as chemical agent, desulfurization test is conducted for the simulating sulfur containing waste water with sulfide content of 1 571.86mg/L and pH value of 9.5. The result shows that when the waste water has the initial pH value of 10, reaction temperature is 35℃ and the adding amount of green vitriol is 16g/L，the best desulfurization result can be obtained. The removal rate of the sulfide in the waste water is up to 99.69% and the sulfide content in the waste water at outlet is reduced to 4.83mg/L.

The heat tube technology and advantages of heat tube exchanger have been introduced and analyzed in the text. The heat tube air preheater has been checked to be used for low temperature emission heat recovery of tube furnace. The thermal work and benefit have been calculated. By the research conclusion, the heat tube technology can improve 10.21% heat capacity of heating furnace, save 5.08×106m3 COG and reduce 2.9×107m3 emission discharge per year and achieve marked effect of conserve energy and reduce emission.

This paper studies the source of chloride ion in ammonium sulfate crystallizing system and its effect, and also makes a proposal to control the content of chloride ion. Because the input and output of chloride ion is not balanced, chloride ion content in mother liquor is too high. As a result, the equipment will be corroded. Therefore, chloride ion content must be controlled for good product quality and system safety.

The technology for ammonia removal from coke oven gas is described and the process, for the production of concentrated ammonia liquor with ammonia scrubbing with ammonium phosphate and other gas ammonia removal processes are compared. The produced concentrated ammonia liquor is characterized by high purity, wide application and better economic benefit of the process. The domestic design of the process has been realized at present.

This paper discovered that the recovery rate of tar and light benzol from stamp- charge battery are both lower than that from top-charge battery by analyzing the reasons affecting recovery rate of by-products from the stamp-charge battery so that cokemaking process should be optimized during the stamp-charge battery production.

Ammonia recovery process is described in this paper, i.e. the ammonia vapor used to be burnt out in A.S. process will be recovered for emission desulfurization in sinter plant, with liquefied ammonia saved by 4 500t annually and with direct economic benefit up to 17.1 million RMB; the concentrated ammonia liquor is delivered to saturator for producing ammonia sulfate fertilizer, with production of 18 250t each year and with economic benefit up to 25.55 million RMB.

This paper described a solution to the problems of HPF desulfurization process, such as big fluctuation of desulfurization efficiency, low intensity of circulating spray in absorber, low ammonia sulfur ratio and high secondary salt in desulfurizer liquor, etc. so that  remarkable desulfurization efficiency and increasing stable operation of the desulfurization system can be achieved by means of improving absorber spray intensity, adding salt abstraction device and reducing the temperature of desulfurization system, etc.

The existing 9 water seal pots are modified according to the actual situation, such as water seal blockage, big energy consumption, inconvenient management, etc., i.e. make-up water are not needful and the gas condensate is changed to closed-circuit recovery so that pollution can be alleviated.