A device and method for judging the air leakage degree of small coal pillars by using tracer gas

Abstract

The invention discloses a device for judging the air leakage degree of a small coal pillar by using a tracer gas, which comprises a tracer gas steel cylinder, a pressure reducing valve, a pressure stabilizing valve, a flow stabilizing valve, a flowmeter, a four-way pipe, a ball valve I, a ball valve II, a ball valve III, a connecting guide pipe, an external guide pipe, a shell and an external guide pipe connector, wherein the four-way pipe comprises a pipe arm I, a pipe arm II, a pipe arm III and a pipe arm IV, the top part of the gas tracer steel cylinder is provided with the pressure reducing valve, the pressure reducing valve, the pressure stabilizing valve, the flow stabilizing valve, the flow meter and an interface of the pipe arm I are sequentially connected through the conducting guide pipe, the ball valve I is arranged inside the ball arm I, the ball valve II is arranged inside the pipe arm II, the ball valve III is arranged inside the pipe arm III, interfaces of the pipe arm II and the pipe arm III are fixedly connected with two sides of the shell respectively, and the shell is provided with an opening I and an opening II at parts corresponding to the interfaces of the pipe arm II and the pipe arm III. The device disclosed by the invention is a miniaturized device, simple and portable, low in cost and easy to operate. The invention further provides an application method of the device.

Description

technical field [0001] The invention relates to the technical field of coal mine safety detection, in particular to a device and a using method for judging the air leakage degree of small coal pillars by using tracer gas. Background technique [0002] Coal spontaneous combustion is one of the main natural disasters in the process of coal mining in my country. In some large coal mines in the country, more than half of the mines have the risk of coal spontaneous combustion, and the fires caused by coal spontaneous combustion account for more than 90% of the total number of mine fires. In the mining of longwall working faces in our country, most of them use large-width coal pillars to realize mining between sections, thus wasting precious coal resources. At present, coal mines use small coal pillars to replace the early large-width coal pillars to reduce the loss of coal resources, but small coal pillars are easy to cause plastic failure of themselves, causing joints and fissur...

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Problems solved by technology

[0003] Tracer gas has been used in mine ventilation measurement for a long time. There have been a large number of literature reports and devices that can continuously and stably release tracer gas have been designed. For example, Wang Chunsheng designed a device for releasing tracer gas (Heilongjiang Science and Technology Information, 2007, 21:33), the device can continuously and stably release the tracer gas, but the designed devices all use the tracer gas such as sulfur hexafluoride (SF 6 ) is released into the external space on the surface of the small coal pillar, due to the SF 6 It is an external release, and it cannot effectively distinguish whether the air leakage is caused by roadway construction defects or the air leakage caused by the rupture of small coal pillars. At the same time, the above method can only study the air leakage of existing small coal pillars, and it cannot be used for the air leakage of small coal pillars with different thicknesses under the same production conditions. Make effective judgments, so it cannot effectively judge whether the reserved size of small coal pillars is reasonable

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