Mining downward drilling, water draining, slag discharging and extraction integrated equipment and gas extraction method

Abstract

The invention discloses mining downward drilling, water draining, slag discharging and extraction integrated equipment which comprises an extraction pipe, and the lower end of the extraction pipe is open; a central pipe is coaxially sleeved with the extraction pipe, a plurality of extraction holes are evenly formed in the bottom of the side wall of the extraction pipe, an extraction cavity is defined between the central pipe and the extraction pipe, an extraction connector and a deslagging connector are arranged at the top of the side wall of the extraction pipe, the extraction connector is connected with a gas extraction pipeline, and the deslagging connector is used for being connected with a deslagging pipe which is led into a roadway drainage ditch; an extraction electromagnetic valveis arranged on the gas extraction pipeline, and a deslagging electromagnetic valve is arranged on the deslagging pipe; and the upper end of the extraction pipe is closed, the upper end of the centralpipe is connected with a water injection pipe through a water injection electromagnetic valve and connected with a gas injection pipe through a gas injection electromagnetic valve. The invention further discloses a corresponding gas extraction method. The mining downward drilling, water draining, slag discharging and extraction integrated equipment is suitable for downward gas extraction holes, coal cinder and accumulated water accumulated in extraction holes can be conveniently discharged, a water seal effect is eliminated, water in the holes is reduced, the air permeability of coal bodies around the extraction pipe is improved, and the gas extraction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of coal mine safety operation, in particular to a gas drainage equipment. Background technique [0002] In coal mine production, coal and gas outburst is one of the serious security threats. Therefore, coal and gas outburst mines or coal seams need to be drilled for gas drainage before coal mining; specifically, drilling into the coal seam to form a gas drainage hole , and then put the extraction pipe into the gas extraction hole, the wall of the extraction tube is uniformly provided with multiple extraction holes, and a negative pressure is formed at the extraction tube through the water ring vacuum pump, so that the gas in the coal seam can pass through The extraction uses a hole to enter the extraction pipe and extract it. [0003] In most cases, the gas drainage holes are horizontal holes or upward holes, and the slag discharge and drainage are relatively smooth. In many cases, coal mines need to choos...

AI Technical Summary

Problems solved by technology

Many documents and field tests have shown that when the hole contains water, the gas channel is blocked and the gas cannot be extracted; when the water in the hole is high, the gas channel is not smooth, the gas extraction concentration is not high, and the gas extraction efficiency is extremely high. Low

At the same time, the commonly used hydraulic anti-permeability measures also have water accumulation in the lower part of the borehole, which greatly reduces the efficiency of gas drainage

[0005] Limited by the working space and working environment of the coal mine, the double-walled drill pipe and the reverse circulation drainage and slag discharge technology suitable for the ground cannot meet the conditions of use in the coal mine, and cannot solve the problem of water accumulation, and still cannot eliminate the water seal effect and reduce the hole Internal moisture

The problem of low gas concentration in downward gas drainage holes and small-angle hydraulic measures has plagued the frontline construction all year round

The low drainage efficiency leads to the generation of blank areas in gas drainage, and even increases the probability of coal and gas outburst, which seriously threatens the safety of coal mine production

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