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Coal blending and coking method with low-flow high-expansion low-shrinkage-degree coking coal involved

A low-shrinkage, coal blending coking technology, applied in the field of coal chemical industry, can solve the problems of coking coal that is difficult to mix, low flow, high expansion and low shrinkage coking coal, etc., to achieve improved bonding strength, improved thermal performance, and obvious thermal performance Effect

Active Publication Date: 2014-11-12
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

[0004] The technical problem to be solved by the present invention is to provide a coal blending coking method involving low flow, high expansion and low shrinkage coking coal, so as to solve the problem of maximum fluidity MF150%, shrinkage X90 and Y value of 22-25mm is difficult to match

Method used

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  • Coal blending and coking method with low-flow high-expansion low-shrinkage-degree coking coal involved

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, gas-rich coal: 5%; low-flow, high-expansion, low-shrinkage coking coal: 15%; 1 / 3 coking coal: 30%; coking coal: 35%; lean coal: 15%.

[0026] The moisture content of each single coking coal is 10%, and the specific gravity of the blended coal pile for direct coal blending is 700kg / m 3 , The CSR of the coke obtained by coking according to the above coal blending scheme is 62%.

[0027] Dry each single type of coking coal, control the moisture content to 5%, and increase the heap specific gravity of blended coal to 800kg / m 3 . The CSR of the coke obtained by coking after increasing the specific gravity is 65.5%.

[0028] That is: under the condition of no briquette and selective crushing process, coking in a mechanical coke oven with a length of more than 6 meters, the strength index of the coke obtained by the method of the present invention can reach: crushing strength M40 up to 86%, wear-resistant The strength M10 reaches 6.5%, the reactivity (CR...

Embodiment 2

[0030] In this embodiment, gas fat coal is 8%; coking coal with low flow, high expansion and low shrinkage degree: 18%; 1 / 3 coking coal: 25%; coking coal: 35%; lean coal: 14%.

[0031] Each single coking coal has not been dried, the water content is 9.6%, and the specific gravity of the blended coal pile for direct coal blending is 720kg / m 3 , The CSR of the coke obtained by coking according to the above coal blending scheme is 61.2%.

[0032] Dry each single coking coal, control the moisture to 4.0%, and the heap specific gravity of the mixed coal is 850kg / m 3 . The CSR of the coke obtained by coking after increasing the specific gravity is 65.3%.

[0033] That is: under the condition of no briquette and selective crushing process, coking in a mechanical coke oven with a length of more than 6 meters, the strength index of the coke obtained by blending coal and coking with the method of the present invention can reach: the crushing strength M40 reaches 87%, and the wear resi...

Embodiment 3

[0035] In this embodiment, gas fat coal is 10%; low flow, high expansion and low shrinkage coking coal: 20%; 1 / 3 coking coal: 25%; coking coal: 35%; lean coal: 10%.

[0036] Each single coking coal has not been dried, the moisture content is 10.2%, and the specific gravity of the blended coal pile for direct coal blending is 680kg / m 3 , The CSR of the coke obtained by coking according to the above coal blending scheme is 61.4%.

[0037] Dry each single coking coal, control the moisture to 2.5%, and the heap specific gravity of the mixed coal is 900kg / m 3 . The CSR of the coke obtained by coking after increasing the specific gravity is 66.4%.

[0038] That is: under the condition of no briquette and selective crushing process, coking in a mechanical coke oven with a length of more than 6 meters, the strength index of the coke obtained by blending coal and coking with the method of the present invention can reach: the crushing strength M40 reaches 87%, and the wear resistance ...

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Abstract

The invention discloses a coal blending and coking method with low-flow, high-expansion and low-shrinkage-degree coking coal involved. The method comprises the following steps that 1), the coal blending structure and the proportion are determined; 2), various types of single coking coal are dried, water in all types of the single coking coal is controlled to be 2.0-5.0%, and the bulk specific weight of the blended coal is 800 kg / m<3>-950 kg / m<3>; 3), the coking coal enters a coke oven, and coal blending and coking are carried out. According to the method, the low-flow, high-expansion and low-shrinkage-degree coking coal is used as fat coal, after the coal types and the proportion of other types of the single coking coal are selected and determined, the bulk specific weight of the blended coal is increased by reducing the amount of the water in all the single coking coal, and the defect that due to poor mobility, the low-flow, high-expansion and low-shrinkage-degree coking coal can not be combined with other coal easily and fully in the expanding process of the plastic mass can be overcome; the strength of the combination with other coking coal is improved remarkably, the thermal performance of coke is obviously improved, and the blending effect of the high-quality fat coal can be achieved.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a coal blending coking method involving coking coal with low flow, high expansion and low shrinkage. Background technique [0002] In recent years, the production capacity of China's iron and steel industry has increased dramatically, and the demand for high-quality coking coal has continued to grow. my country's high-quality coking coal resources are scarce, and domestic iron and steel enterprises have to import a large amount of high-caking coking coal from overseas to meet the growing demand for blast furnaces. However, in the introduction of imported coal, it was found that many so-called "high-quality coking coals" are far from the domestic high-quality coking coal. [0003] For example, a batch of imported coal resources introduced by a company has a volatile content of 26-28%, an expansion b value of >150%, a G value of 90-100, a Y value of 22...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/04
Inventor 项茹薛改凤鲍俊芳张雪红宋子逵詹立志任玉明查海鑫陈鹏陈细涛
Owner 武汉钢铁有限公司
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