| abstract |
The invention discloses a blockage dredging and permeability increasing device and method under the action of air pulse circulating power, and the device comprises an air pulse generating device and an extraction drill hole blockage dredging and permeability increasing device, wherein the air pulse generating device is communicated with the extraction drill hole blockage dredging and permeability increasing device through a connecting pipeline; the air pulse generating device comprises a host, wherein the host comprises a box body, a booster pump arranged at the bottom in the box body, a booster pipeline communicated with the booster pump, and a pressure relief valve, a control valve and a pressure gauge which are arranged on the booster pipeline, and when the pressure gauge displays that the pressure in the booster pipeline rises or falls back to a set value, the pressure relief valve is automatically opened or closed. According to the invention, an aerodynamic field with repeated pressurization and pressure relief effects is established in the extraction drill hole, so that the blockage of a gas seepage channel of the drill hole and a gas flow channel in the extraction pipe can be removed, and the gas flow channel is dredged; and a gas seepage channel is added, so that the gas permeability of the coal body is effectively improved, and the aim of improving the concentration and flow of low-concentration extraction borehole gas is fulfilled. |