Long standpipe gas extraction in worked-out section

A gas extraction and riser technology, which is applied in gas discharge, surface mining, mining equipment, etc., can solve the problems of over-limit gas concentration in the upper corner, low extraction concentration, affecting the normal production of the working face, etc.

Inactive Publication Date: 2007-09-05
淮北矿业股份有限公司祁南煤矿 +1
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Problems solved by technology

The suction port of the traditional goaf buried pipe gas drainage is generally arranged on the floor of the goaf or the suction port is raised to a position 1-2m away from the floor. The concentration of buried pipe drai

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  • Long standpipe gas extraction in worked-out section
  • Long standpipe gas extraction in worked-out section

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Embodiment Construction

[0016] Below in conjunction with the embodiment in the accompanying drawings, the present invention will be further described:

[0017] In the goaf long standpipe gas extraction method of the present invention, the position of the suction port is determined according to the movement law of the coal seam roof rock layer and the height of the caving zone, and the main pipe 2 and the branch pipe are laid along the bottom plate of the wind tunnel 1 near the upper side. The gas drainage connecting pipe network composed of gate valves, the main pipe is provided with a variable diameter tee every 25m, and the branch pipe is a steel pipe with a diameter of 108mm and a length of 30m. There is a control gate valve near the section; the main pipe is a steel pipe with a diameter of 216mm. Use a drilling rig to drill vertically downward to the bottom plate 7 of the air tunnel in the coal mining face, with a drilling depth of 1.5-2m and a diameter of 150mm; drill holes vertically upward at ...

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Abstract

This is a gas extraction method via a long vertical pipe at goaf zone. Two holes are made on the top and bottom board of the air gallery at the working face. Sectional metal pipes are linked together to form a long vertical pipe, with the top sealed and inserted into the hole on the top board, and the bottom inserted into the bottom board and concreted. Small holes distributes on the pipe wall and been wrapped with pack. The pipe is connected to the extraction network. With 5m of the pipe getting into the goaf zone, start extraction; with the previous pipe getting into the goaf zone at 30m, and the following one at 5m, shut the previous pipe and open the following one. So realize a continuous extraction and decrease the gas concentration at the solid angle. The gas concentration could be controlled under 0.6%.

Description

technical field [0001] The invention relates to a gas drainage method with a long standpipe in a goaf, and is especially suitable for gas drainage in the goaf of a coal mining face in coal mine production safety. Background technique [0002] Coal gas is thrown into the goaf in the coal mining face adjacent to the coal (rock) layer and the goaf, and gushes out from the upper corner along the air leakage direction of the gob, often causing the gas concentration in the upper corner to exceed the limit, and even causing the return air to flow gas. The concentration exceeds the limit, seriously affecting the safe production of coal mining face. In the goaf, due to the influence of leakage air flow, the gas is distributed in layers along the vertical direction of the goaf, and the gas concentration in the caving zone increases gradually with height. The suction port of the traditional goaf buried pipe gas drainage is generally arranged on the floor of...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21C41/16
Inventor 沐俊卫程远平沈怀津沈士成王海锋王亮
Owner 淮北矿业股份有限公司祁南煤矿
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