System and method for detecting goaf air leakage under gob-side entry retaining mining in real time

Abstract

The invention belongs to the technical field of underground coal mine ventilation. Goaf air leakage is a nature important link of coal of an existing goaf, however, existing goaf air leakage amount detection is large in manpower consumption and long in detection time, the underground goaf air leakage situation cannot be obtained as soon as possible, goaf management cannot be judged in time. The invention provides a system and method for detecting goaf air leakage under gob-side entry retaining mining in real time. Tracer gas is released in a goaf, mixed gas of the goaf is collected and detected, the contained tracer gas is detected and analyzed, data is transmitted to a ground control system, sound-light alarm is triggered when the air leakage reaches a set threshold value; the installation positions and serial numbers of tracer gas release devices are adjusted according to advancing of a working face, unmanned operation starting is achieved, manpower is saved, the safety in the production process is improved, and the production cost is effectively reduced.

Description

technical field [0001] The invention relates to the detection of air leakage in a goaf of an underground gob-side entry in a coal mine, and more specifically, relates to a system and method for real-time detection of the air leakage in a goaf of a gob-side entry. Background technique [0002] Under the technical conditions of gob-side entry retaining without coal pillars, since the side section of the retaining entry is the caving zone of the goaf, the goaf is completely exposed in the entryway, forming a completely open state, which is different from that of the traditional mining technology. Compared with the situation of airtight sealing goaf, the gob is not completely closed, and different ventilation methods and different air volume ratios of the same ventilation method have an important impact on the air leakage, gas emission and spontaneous combustion of the goaf. [0003] The management of air leakage in gobs is an important link to prevent coal spontaneous combustio...

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Problems solved by technology

[0003] The management of air leakage in the goaf is an important link to prevent coal spontaneous combustion in the goaf. When the wind speed of the air leakage in the goaf is 0.12m / min, it cannot be measured with various existing anemometers.

Tracer gas such as SF 6 There is no pathological reaction to the human body within 24 hours. Under the condition of an atmospheric pressure, the solubility in water at 25°C is extremely small, and the materials encountered in the mine are harmful to SF 6 No significant adsorption, SF 6 It has good thermal stability and chemical inertness; the existing detection of air leakage in gobs consumes a lot of manpower and takes a long time to detect. Lo

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