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Method for replacing mine goaf gas with carbon dioxide

A carbon dioxide and goaf technology, applied in the direction of gas emission, safety devices, mining equipment, etc., can solve the problems of high cost and difficult user acceptance of storage technology

Active Publication Date: 2013-03-20
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The storage technology of pressure injection of carbon dioxide into underground rock fractures is very expensive and difficult to be accepted by users

Method used

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  • Method for replacing mine goaf gas with carbon dioxide

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Embodiment Construction

[0023] The present invention is described in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the following specific embodiments.

[0024] The goaf with a gas concentration of 40% is selected as the replacement goaf 1, and all the external exit roadways of the replacement goaf 1 are closed. Such as figure 1 As shown, a carbon dioxide intake pipe 5 is laid between the closed 4 reserved pipeline opening in the lower area and the carbon dioxide generating device, a gas output pipe 3 is laid between the sealed 2 reserved pipeline opening in the upper area and the gas utilization device, and the lower area A U-shaped drainage pipe 6 is arranged at the bottom of the airtight 4, and a valve 7 is arranged on the U-shaped drainage pipe 6. The U-shaped drainage pipe 6 is used to discharge and replace accumulated water in the goaf 1 and prevent gas from leaking out.

[0025] The carbon dioxide gas inlet pipe 5 is arranged ...

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Abstract

The invention belongs to the field of coal mining and relates to a method for replacing mine goaf gas with carbon dioxide. The method provided by the invention comprises the following steps: (1) selecting a closed goaf with the concentration of gas being more than or equal to 40% as a replacement goaf; (2) paving a carbon dioxide inlet pipe between a pipeline port hermetically reserved at the lower part of the replacement goaf and a carbon dioxide generating device, and conveying carbon dioxide to the replacement goaf at the speed of 5-10m<3> / h; (3) paving a gas output pipe between a pipeline port hermetically reserved at the upper part of the replacement goaf or a gas drainage port and a gas utilization device, and extracting the gas from the replacement goaf at the speed of 5-10m<3> / h; and (4) stopping replacing until the concentration of the gas in the replacement goaf is less than 10%. By applying the method provided by the invention, the gas in the replacement goaf can be effectively extracted, and the carbon dioxide can be preserved.

Description

technical field [0001] The invention belongs to the field of coal mining and relates to a method for replacing gas in a mine goaf with carbon dioxide. Background technique [0002] In the process of coal mining, a large number of goafs will be formed. Some goafs have a space of up to one million cubic meters, and the total volume of multiple adjacent goafs can reach more than ten million cubic meters. The goaf is filled by caving roof rocks, etc. Since the top of the goaf is covered with thick bedrock and loose layers on the surface, in order to prevent the natural fire phenomenon of the goaf due to air leakage in the goaf, all the goafs leading to the goaf are also protected. The roadway and other exits in the area are fire-proof and airtight, and the gas in the goaf can be sealed inside for a long time because there is no escape channel. Among them, a large amount of gas in the coal seam flows into the mining space, which brings serious harm to the safety production of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00
Inventor 周成军
Owner CHINA SHENHUA ENERGY CO LTD
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