Method for electrochemically strengthening desorption and seepage of coal gas

A desorption seepage and electrochemical technology, applied in the direction of gas discharge, earthwork drilling, safety devices, etc., to achieve the effect of preventing rock burst, improving the risk of leakage, and preventing coal and gas outburst

Inactive Publication Date: 2013-05-08
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The gas injected into the coal seam is mainly CO 2 , N 2 or flue gas, these gases are more abundant in coal seams than CH 4 It has a stronger adsorption force, and can increase the reservoir pressure conductivity coefficient and produce a competitive adsorption displacement effect under the condition of basically not changing the coal reservoir pressure. However, this gas injection displacement method is not suitable for application in underground coal mining.

Method used

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  • Method for electrochemically strengthening desorption and seepage of coal gas

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Effect test

Embodiment approach 1

[0019] The method for electrochemically strengthening coal gas desorption and seepage of the present invention performs electrochemical strengthening of coal gas desorption and seepage on a coal seam in a coal mining face, so as to improve the extraction rate of coal seam gas. The process is:

[0020] I. In a mine 3 # Drilling holes in coal seam roadways, according to figure 1 (a) The electrochemically strengthened coal gas desorption seepage system shown in (a) is electrochemically strengthened;

[0021] II. Electrodes are arranged on one side of the coal wall of the inclined roadway. The electrode material is Fe, and the electrode length is 2 / 3 of the drilling depth. The adjacent electrodes are connected with the positive and negative electrodes of the external electric field and the ammeter, and the holes are sealed and the electrolyte is injected;

[0022] III. The applied electric field is a DC electric field, and the electric field strength is 0.25V cm -1 ~6.6V·cm -1...

Embodiment approach 2

[0025] Implementation Mode 2: According to figure 1 (a) The electrochemically enhanced coal gas desorption seepage system shown in (a), the electrodes are arranged on one side of the vertical working face, and the electric field strength is 1V cm -1 , the electrolyte is water, and the coal seam gas recovery rate after electrochemical strengthening is increased by about 11%. Others are the same as Embodiment 1.

Embodiment approach 3

[0026] Implementation Mode 3: According to figure 1 (b) The electrochemically enhanced coal gas desorption seepage system shown in (b), the electrodes are arranged on both sides of the coal wall of the oblique roadway, and the electric field strength is 1V cm -1 , the electrolyte is KOH, the concentration is 0.5mol l -1 , the coal seam gas recovery rate increased by about 17% after electrochemical enhancement. Others are the same as Embodiment 1.

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Abstract

The invention discloses a method for electrochemically strengthening desorption and seepage of coal gas, belonging to the field of coal bed gas extraction and coal electrochemical modification technologies. The method is characterized in that a coal body temperature is raised through changing electricity, chemistry, mineralogy and petrography characteristics of coal and fracture and pore structures of coal under the combined action of an external electric field and an electrolyte to generate gases, reduce activation energy and decrease adsorption potential so as to strengthen the desorption and the seepage of the coal gas, thus the gas extraction efficiency of coal beds is increased. In the method, holes are drilled in a heading or working face and electrodes are arranged in the holes, the external electric field is an alternating-current electric field or direct-current electric field, and the electrolyte is an alkali electrolyte. Compared with the traditional method for increasing the gas extraction efficiency of the coal beds, the method has the advantage that the gas extraction efficiency of the coal beds is increased by 10-30 percent through the electrochemical strengthening.

Description

technical field [0001] The invention discloses a method for electrochemically strengthening coal gas desorption and seepage, which belongs to the category of coal seam gas drainage and coal electrochemical modification technology, and is specifically a method for strengthening the desorption and seepage of coal gas under the joint action of an external electric field and electrolyte, The purpose is to improve the electrochemical strengthening method of coal seam gas recovery rate. Background technique [0002] The average coal seam gas extraction rate in my country is only about 20%, while the coal seam gas extraction rate in major coal-producing countries such as the United States and Australia is above 50%. A technical method for improving the desorption seepage of coal seam gas to increase the coal seam gas extraction rate. [0003] Existing methods to improve gas desorption and seepage in coal seams can be classified into three categories: the first category is the use o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00
Inventor 康天合
Owner TAIYUAN UNIV OF TECH
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