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Modification treatment method for weak caking coal or non-caking coal

A technology for non-stick coal and weakly sticky coal, which is applied in the field of improving the cohesion and coking performance of weakly sticky or non-sticky coal by means of steam treatment and modification, so as to achieve the effect of improving the cohesion and coking property.

Inactive Publication Date: 2011-09-21
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been reported that weakly caking coal with a low degree of metamorphism can be used for coking coal blending to improve its caking performance by means of steam and atmospheric pressure treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Taking Shenfu coal as an example, Shenfu coal was subjected to steam treatment at 100°C in the test. The amount of steam introduced was twice the mass of the coal sample, and the particle size of the coal sample was less than 3mm. After steam treatment, the extraction rate of Shenfu coal in N-methyl-2 pyrrolidone / carbon disulfide mixed solvent (1:1 volume ratio) increased by 65%, the caking index G value increased by 60%, and the oxygen content decreased 4.5%. Compared with the basic proportion of raw coal, the microstrength of coke obtained after coking with water heat treatment coal (crucible coke) is increased by 3.1%, and the CO 2 The reactive CRI decreased by 2.5%, and the post-reactive intensity CRS increased by 8.9%.

Embodiment 2

[0013] Taking Shenfu coal as an example, Shenfu coal was subjected to steam treatment at 250°C in the test. The amount of steam introduced was twice the mass of the coal sample, and the particle size of the coal sample was less than 3mm. After steam treatment, the extraction rate of Shenfu coal in N-methyl-2 pyrrolidone / carbon disulfide mixed solvent (1:1 volume ratio) increased by 150%, the caking index G value increased by 160%, and the oxygen content decreased 8.5%. Compared with the basic proportion of raw coal, the microstrength of the coke obtained after coking with water heat treatment coal (crucible coke) is increased by 6.1%, and the CO 2 The reactive CRI decreased by 12.5%, and the post-reactive intensity CRS increased by 28.9%.

Embodiment 3

[0015] Taking Shenfu coal as an example, Shenfu coal was subjected to steam treatment at 100°C in the test. The amount of steam introduced was 1 times the mass of the coal sample, and the particle size of the coal sample was less than 3mm. After steam treatment, the extraction rate of Shenfu coal in N-methyl-2 pyrrolidone / carbon disulfide mixed solvent (1:1 volume ratio) increased by 26%, the caking index G value increased by 40%, and the oxygen content decreased 3.5%. Compared with the basic proportion of raw coal, the microstrength of coke obtained after coking with water heat treatment coal (crucible coke) is increased by 2.1%, and the CO 2 The reactive CRI decreased by 2.0%, and the post-reactive intensity CRS increased by 6.9%.

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Abstract

The invention provides a modification treatment method utilizing steam for weak caking coal or non-caking coal, which are represented by Shenfu coal and with a low metamorphic grade and a high volatile matter content. According to the method, the Shenfu coal is treated with steam and modified in a fixed bed reactor under proper conditions, so that the modified Shenfu coal can be used in coal blending for coking. After modification, the amount of the Shenfu coal used in coal blending for coking can be raised to 8-15% to replace gas coal, on the premise of satisfying coke quality, so as to substantially reduce coal blending coking costs, stabilize and enlarge coking coal resources, and expand usage approaches of weak caking coal or non-caking coal with a low metamorphic grade and a high volatile matter content.

Description

technical field [0001] The invention belongs to the technical field of upgrading treatment of weakly caking or non-caking coal, and in particular relates to improving the caking and coking performance of weakly caking or non-caking coal by means of steam treatment and upgrading. Background technique [0002] The current situation of my country's coal resources is that high-quality coking coal resources are becoming increasingly scarce, while non-caking coals with low metamorphism and high volatile content, such as Shenfu coal, are abundant. The use of these weakly sticky or non-sticky coals can maximize the use of coking coal resources to alleviate the shortage of coking coal. However, weak sticky or non-sticky coal has a low degree of deterioration, many oxygen-containing functional groups, high hydrogen bond association strength, poor bonding performance, and high volatile content, so the amount of direct use is limited, so it must be improved. Quality improvement treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/08
Inventor 水恒福周华常洪涛王知彩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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