Method for preventing spontaneous combustion of stored coal piles by covering coal piles by utilizing oxygen-insulating materials

A technology of oxygen isolation and coal piles, which is applied in fire rescue and other directions, can solve the problems of expensive wind barriers, difficulty in large coal piles, and large coal footprint, so as to prolong the period of spontaneous combustion, suppress spontaneous combustion of piles, and suppress penetration effect

Active Publication Date: 2011-12-21
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods have their own limitations, and their popularization and use are limited.
For example, the water injection cooling method increases the water content of coal; organic gel, water glass and water mortar cover all increase the ash content of coal, which affects the quality of coal. At the same time, the use of these materials in port storage will affect the normal loading and unloading of coal. It is necessary to remove the material separately before it can operate normally; it is more expensive to set up wind barriers; the coal pile with small inclination angle occupies a large area; the compaction method is difficult to prevent the spontaneous combustion of large coal piles

Method used

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  • Method for preventing spontaneous combustion of stored coal piles by covering coal piles by utilizing oxygen-insulating materials
  • Method for preventing spontaneous combustion of stored coal piles by covering coal piles by utilizing oxygen-insulating materials

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: First, pulverize and sieve lump coal with a crusher to obtain pulverized coal less than 6mm as an oxygen barrier material; then use a belt conveyor to evenly cover the pulverized coal on the surface of the coal pile with a height of 1.8m from the ground to the coal pile, The covering thickness is 70cm (the particle size of the coal sample in the coal pile: 0-50mm; the size of the coal pile: the diameter of the bottom surface is 14.6m, and the total height of the coal pile is 4.6m); The damage shall be re-covered with pulverized coal in time, and at the same time, the low-temperature oxidation temperature of the coal pile and the symbolic gas concentration coupling measurement device shall be used to monitor whether the internal temperature of the coal pile exceeds 70°C and whether the standard gas concentration rises rapidly, so as to judge whether there is a possibility of spontaneous combustion in the coal pile The coal pile can be placed for 123 days wit...

Embodiment 2

[0025] Embodiment 2: first use a crusher to crush and sieve the waste cement slag filling material to obtain a <6mm oxygen barrier material; then use a belt conveyor to evenly cover the oxygen barrier material on the surface of the coal pile with a height of 1.8m from the ground to the coal pile, The covering thickness is 70cm (the particle size of the coal pile coal sample: 0-50mm; the size of the coal pile: the diameter of the bottom surface is 14.6m, and the total height of the coal pile is 4.6m); check the damage of the oxygen barrier material layer during the storage of the coal pile If there is any damage, it shall be covered with oxygen barrier material in time, and at the same time, the low-temperature oxidation temperature of the coal pile and the symbolic gas concentration coupling measurement device shall be used to monitor whether the internal temperature of the coal pile exceeds 70°C and whether the standard gas concentration rises rapidly, so as to judge whether th...

Embodiment 3

[0026] Embodiment 3: first crush and sieve lump coal with a crusher to obtain pulverized coal less than 13 mm as an oxygen barrier material; The thickness is 70cm (the particle size of the coal sample in the coal pile: 0-50mm; the size of the coal pile: the length of the bottom surface is 35m, and the total height of the coal pile is 13.5m); check the damage of the pulverized coal layer during the storage of the coal pile, and if there is any damage, timely Re-cover with pulverized coal, and at the same time use the low-temperature oxidation temperature of the coal pile and the symbolic gas concentration coupling measurement device to monitor whether the internal temperature of the coal pile exceeds 70°C and whether the standard gas concentration rises rapidly, so as to judge whether there is a possibility of spontaneous combustion in the coal pile; Coal piles can only be placed for 30 days without spontaneous combustion.

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Abstract

The invention relates to a method preventing the spontaneous combustion of stored coal piles by covering coal piles by utilizing oxygen-insulating materials, which comprises the following steps: crushing and screening the oxygen-insulating materials so as to obtain granulated oxygen-insulating materials with a grain size less than 6mm; determining the required covering thickness of the oxygen-insulating materials according to the shortest spontaneous combustion period of a coal pile corresponding to the covering thickness of the oxygen-insulating materials; and paving the oxygen-insulating materials on the surface of the mid-lower part of the coal pile. Because the oxygen-insulating materials with smaller osmotic coefficient are adopted to cover the surface of the coal pile, the air is inhibited from entering the coal pile in a diffusion or seepage mode, and the rate of low-temperature oxidation reaction of coal and oxygen is lowered so as to achieve the purpose of preventing the spontaneous combustion of stored coal piles.

Description

technical field [0001] The invention relates to a method for preventing spontaneous combustion of coal, in particular to a method for covering coal piles with an oxygen-insulating material to prevent spontaneous combustion of coal piles. Background technique [0002] Coal spontaneous combustion is one of the major disasters that threaten the safety of coal mines and coal transportation. In my country's key state-owned coal mines, mines with the danger of spontaneous combustion account for about 51.3%, and fires caused by spontaneous combustion account for more than 90% of the total number of fires, which seriously threaten the safety of people's lives and property. Spontaneous combustion of coal produces a large amount of SO 2 、H 2 S, CO and CO 2 gas, seriously polluting the environment. At present, with the development of the economy, the demand for coal is increasing day by day, the regional span of transactions is gradually increasing, and the coal storage of coal por...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62C3/06
Inventor 吴国光王万耀李增华谷红伟孟献梁刘玉宝王光友高广亮张永建
Owner CHINA SHENHUA ENERGY CO LTD
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