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Control method of coke strength

A coke strength and scheme technology, applied in coke ovens, petroleum industry, etc., can solve problems such as coal blending and degraded coke quality

Active Publication Date: 2016-06-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, due to the increasing shortage of coking coal resources, the sources of coking coal resources in the coal market have become more and more complicated, and the phenomenon of coal blending is common. At the same time, coking enterprises sometimes ignore coal quality in order to reduce procurement costs. During coking production, it was found that the content of large inert components in the coking structure of some fat coal and coking coal supplied by Shanxi, Henan and other places reached more than 20%. If the existing coal blending process is directly blended in a large proportion, the quality of coke will be deteriorated

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Experimental program
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Embodiment 1

[0029] In Example 1, although the proportions of various coal types meet the range requirements, the blended coal And the content of inert components with a diameter greater than 200um reaches 6.31%, and the coke thermal strength CSR is only 57.17%. In E mine And the content of the inert component with a diameter greater than 200um reaches 25%, two adjustment methods can be adopted: the first method, such as embodiment 2, reduces the proportion of E ore by 15%, and replaces it with D ore, but the cost of coal blending increases by 18 yuan / tons; the second method, such as embodiment 3, does not adjust the proportion of E ore, it is pre-crushed, the cost of coal blending remains unchanged, and the power consumption of pre-crushing is about 0.9 yuan / ton. Obviously, the second option is economical and desirable. After the E ore is pre-crushed, the coke thermal strength CSR increases from 57.17% to 65.92%.

Embodiment 4

[0030] Example 4, all 6 kinds of coals are pre-crushed. Due to excessive crushing of gas coal, fat coal, 1 / 3 coking coal and D mine coking coal, the specific surface area of ​​coal particles increases and the cohesiveness decreases. The total content of 4-30um anisotropic structural components decreased from 32.22% to 28.75%, and the coke thermal strength CSR also decreased to 61.56%.

[0031] Under the conditions of no coal humidity control, no briquette, and traditional coke oven dry quenching in a top-loaded coke oven with a height of 4.3 meters or more, the coke thermal strength CSR obtained by the method of the present invention is 65-70%, the M40 is 87-89%, and the M10 is 5.5-80%. 6%, the condition of the blast furnace is stable.

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Abstract

The invention discloses a coke strength regulation method which comprises the following steps: 1) each single grade coal vitrinite mean maximum reflectance is determined, and the content of inert components with the diameter greater than 200mum and the total content of anisotropic structure components with the isochromatic domain size of 4-30mum in the single grade coal coke forming optical texture are determined; 2) coking coal with equal to or more than 20% of the inert components with the diameter greater than 200mum is pre-crushed, and the grain size is crushed below 0.5mm; and 3) a coal blending scheme is prepared, and inspected and adjusted until the content of the inert components with the diameter greater than 200mum in the mixed coal is less than or equal to 3%, and the total content of the anisotropic structure components with the isochromatic domain size of 4-30mum is greater than or equal to 30%. The coke strength regulation method overcomes lack of understanding of occurrence state and size of the inert components in coke, by precrushing of the coking coal with equal to or more than 20% of the inert components with the diameter greater than 200mum, the content of the inert components with the diameter greater than 200mum in coke is controlled to be less than or equal to 3%, and the coke strength is ensured.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and coking, and in particular relates to a method for regulating and controlling coke strength. Background technique [0002] High and stable coke quality is one of the basic conditions for the blast furnace to run smoothly. The strength of coke has a great influence on the operation of blast furnace and the quality of molten iron. The physical and chemical properties of solid materials are mainly affected by their microstructure. A large number of experimental studies and production practices have shown that for coke, the most critical factor restricting the cold and hot strength is the coke optical structure. Yuzo Sanada, a Japanese coal coke expert, also mentioned that there is a deep relationship between the optical structure of coke and the characteristics of coke in the article "The Change of Coke Production Technology in my country and Related Basic Research" in the 5th issue of "Iron a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B57/04
CPCC10B57/04
Inventor 鲍俊芳张雪红薛改凤陈鹏陈细涛詹立志项茹宋子逵任玉明王元生万基才
Owner 武汉钢铁有限公司