Novel concentration-pressure sensing type flow control device and use method thereof

Abstract

The invention discloses a novel concentration-pressure sensing type flow control device. The device comprises a box body, wherein the box body comprises an air and water inlet, an extraction opening and a water and slag discharge opening, the extraction opening comprises a main extraction pipeline and a low-concentration extraction pipeline, one side of the extraction opening is fixedly connectedwith a three-way pneumatic valve, the three-way pneumatic valve communicates with the main extraction pipeline and the low-concentration extraction pipeline, the top surface of the box body is fixedlyconnected with a pressure sensor and a gas concentration sensor, and gas is controlled to flow to the main extraction pipeline or the low-concentration extraction pipeline through opening and closingof the three-way pneumatic valve. According to the device and the method, a gas extraction negative pressure supply channel, namely a channel for drilling gas from the box body to the temporary extraction system pipeline, is automatically adjusted by detecting the concentration and pressure of the drilling gas, automatic flow control can be achieved, the loss of the negative pressure of an underground extraction pipeline is effectively reduced, and the utilization rate of underground gas is increased.

Description

technical field [0001] The invention belongs to the field of coal mining, and in particular relates to a novel concentration-pressure sensor type flow control device and a using method thereof. Background technique [0002] Gas disaster is one of the most important disasters in high gas mines and coal and gas outburst mines, and it is also one of the main bottlenecks restricting their production. With the increase of mining depth, the gas content and gas pressure gradually increase, and the engineering volume and cost required to solve the gas problem are also increasing. Especially for a single low-permeability coal seam, the efficiency of gas drainage is low, and a large number of drilling Appropriate anti-reflection measures need to be taken to speed up the progress of gas control, achieve a balance between pumping, digging and mining, and ensure mine output. For a single low-permeability and high-gas coal seam, the measures of hydraulic punching and hydraulic slotting h...

AI Technical Summary

Problems solved by technology

During hydraulic punching and hydraulic cutting, in order to prevent the gas from exceeding the limit, most of them use blowout preventers to make the drilling gas enter the pipeline of the underground temporary drainage system and finally be emptied and not reused. Timing, gas pressure, gas concentration, gas gushing volume, duration, etc. are all uncontrollable. If the gas outlet of the gas-water separator is connected to the temporary drainage system for a long time, it will easily cause the loss of gas drainage negative pressure; With the increase of drilling construction, the negative pressure supply burden of underground temporary drainage pumps will gradually increase, and it is impossible to ensure the effective and on-demand supply of negative pressure when the amount of gas gushing out of drilling holes increases. Gas gushing out of holes can easily lead to accidents such as gas exceeding the limit on the construction site and gas not being fully utilized

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