Low permeability coal seam electricity explosion vibration and microwave assisting liquid nitrogen freeze-thawing permeability increasing device and method

Abstract

The invention provides a low permeability coal seam electricity explosion vibration and microwave assisting liquid nitrogen freeze-thawing permeability increasing device. The low permeability coal seam electricity explosion vibration and microwave assisting liquid nitrogen freeze-thawing permeability increasing device comprises a pulse discharging reactor, a cable, a high voltage pulse generator,a fracturing pipe, a mining pipe, a high pressure rubber pipe, a microwave transmitter, a coaxial waveguide, a microwave converter, a microwave generator, a first hole packer, a second hole packer, anitrogen inflating pipe, a water box, a high pressure water pump, a liquid nitrogen pump and a liquid nitrogen tank. The invention further discloses a low permeability coal seam electricity explosionvibration and microwave assisting liquid nitrogen freeze-thawing permeability increasing method. A hydraulic fracturing technology, an electricity explosion vibration technology, a liquid nitrogen freeze-thawing technology and a microwave technology are harmoniously integrated, the permeability and the porosity of a coal seam are increased to a great extent, coal seam fractures can be increased, the liquid nitrogen freeze-thawing efficiency is improved, circular work is conducted, ice in the fractures is easily molten, the permeability of a low-permeability coal seam is greatly improved, the effect of mining and exhausting methane gas is improved, expected time needed for mining the methane gas is shortened by a large margin, and a superior premise is provided for mining the methane gas ofa mine.

Description

technical field [0001] The invention belongs to the technical field of anti-permeability of low-permeability coal seams, and in particular relates to an electric detonation and microwave-assisted liquid nitrogen freeze-thaw anti-permeability device and method for low-permeability coal seams. Background technique [0002] Gas exists in coal mines, but as a clean energy source, it is mainly due to the influence of low permeability and high adsorption of coal seams in my country. In the process of mining, not only the investment cost is high, but also the gas recovery rate is relatively low. . In order to improve the gas drainage rate, various anti-reflection methods have been proposed at home and abroad: hydraulic fracturing anti-permeability method, hydraulic slotting anti-permeability method, high-energy gas anti-permeability method, controlled blasting anti-permeability method, hydraulic punching anti-permeability method, etc. . However, with the depth of underground minin...

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Problems solved by technology

However, with the depth of underground mining, the existing anti-reflection methods will gradually fail to meet the production needs of mines

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