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Steam coal preparation technique with low coal slime yield

A thermal coal and process technology, which is applied in the field of thermal coal preparation technology with low coal slime output, can solve the problems of limited increase in thermal value of thermal coal, increased moisture content of coal products, and washing is worse than no washing, so as to reduce coal slime. The effect of generating, reducing the generation of pulverized coal, and reducing the generation of pulverized coal

Inactive Publication Date: 2011-09-14
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in thermal coal washing, while reducing ash content, a large amount of coal slime is produced, which increases the moisture content of the coal product after washing, resulting in a limited increase in the calorific value of thermal coal after washing, and even the phenomenon that washing is not as good as no washing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Long-flame coal with an ash content of 25% and a moisture content of 30% is stored in a circular silo with a coal storage height of 9 meters. The long-flame coal is sent to the classification crusher produced by the British MMD Mining Machinery Development Company by a belt, and the long-flame coal is crushed to less than 200mm, and then sieved, and the sieving particle size is 25mm. The lump coal with a particle size greater than 25mm enters the jigging washing equipment produced by Sekiman Company of the United States for washing. After washing the lump coal, the ash content is reduced from 25% to 16%. Coal with a particle size of less than 25mm is screened for fine powder, and the particle size of the fine powder screen is 3mm; the fine powder with a particle size of less than 3mm directly enters the product bin, and the remaining fine coal enters the non-pressure three-product dense medium cyclone system produced by Tangshan Guohua Co., Ltd. Washing and deashing, di...

Embodiment 2

[0026] The non-caking coal with an ash content of 28% and a moisture content of 20% is stored in a circular bin, and the coal storage height is less than 10 meters. The non-sticky coal is sent to the grading crusher produced by the British MMD Mining Machinery Development Company by belt, and the non-sticky coal is crushed to less than 200mm, and then sieved, and the sieving particle size is 13mm. The lump coal with a particle size greater than 13mm enters the jigging washing equipment produced by Sekiman Company of the United States for washing. After washing the lump coal, the ash content is reduced from 28% to 16%. Coal with a particle size of less than 13mm is screened for fine powder, and the particle size of the fine powder screen is 6mm; the fine powder smaller than 6mm directly enters the product bin, and the remaining fine coal enters the non-pressurized three-product dense medium cyclone system produced by Tangshan Guohua Co., Ltd. Washing and deashing, divided into ...

Embodiment 3

[0028] Weakly caking coal with an ash content of 20% and a moisture content of 22% is stored in a circular silo, and the coal storage height is 9 meters. The weakly caking coal is sent to the classification crusher produced by MMD Mining Machinery Development Co., Ltd. in the UK by a belt, and the weakly caking coal is crushed to less than 200mm, and then sieved, and the sieving particle size is 50mm. The lump coal with a particle size greater than 50mm enters the jigging washing equipment produced by Sekiman Company of the United States for wet washing. After washing the lump coal, the ash content is reduced from 20% to 13%. Coal with a particle size of less than 50mm is screened for fine powder, and the particle size of the fine powder screen is 6mm; the fine powder smaller than 6mm directly enters the product bin, and the remaining fine coal enters the non-pressurized three-product dense medium cyclone system produced by Tangshan Guohua Co., Ltd. Washing and deashing, divid...

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Abstract

The invention relates to a steam coal preparation technique with low coal slime yield, comprising the following steps of: (1) storing the raw coal of steam coal in a horizontal cabin, wherein the height of coal storage is less than 10 m; (2) crushing the raw coal less than 200 nm by using a grading crusher; (3) feeding the raw coal into a bolting mill for milling after crushing, wherein the coal with big screening size enters a lump coal washing system for washing, the fine coal powder with small size is then sieved, and the fine powder less than 6 nm after sieving directly enters a product cabin; and the remaining slack coal enters a non-pressure dense media swirler for washing and de-liming. The technique can wash all the steam coal with relatively lower cost; the coal slime yield is reduced; and the calorific value of washed steam coal product is increased.

Description

technical field [0001] The present invention relates to steam coal preparation process, more specifically, relates to a steam coal preparation process with low coal slime output. Background technique [0002] Thermal coal in my country mainly includes non-caking coal, weakly caking coal, long-flame coal, gas coal, lean coal, lean coal and lignite. Since the main index of thermal coal is calorific value, there are strict requirements on the moisture and ash content in coal; otherwise, the calorific value of coal products will drop significantly, and its utilization efficiency will drop significantly. With the deepening of energy saving and emission reduction, the washing requirements for steam coal products are gradually increasing, and the washing rate of steam coal is gradually increasing. However, in thermal coal washing, while reducing ash content, a large amount of slime is produced, which increases the water content of the coal product after washing, resulting in a lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B5/34
Inventor 杨汉宏张文辉郭建斌张树屏徐会军刘小奇王伟唐清松王开明朱传忠
Owner CHINA SHENHUA ENERGY CO LTD
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