An indirect test and alarm device for oxidation temperature of residual coal in goaf

Abstract

The invention discloses a worked-out-section residual coal oxidizing temperature indirect test and alarm device which is applicable to detection and alarm for the oxidizing temperature of residual coal in places where people are hard to enter therein, such as a worked out section under an underground coal mine. The device is composed of small gas-releasing holes (1), an upper high-strength steel ball half (2), a glass ball (3), temperature-sensing special smell liquid (4), a steel wire gauze (5), a breathable cushioning light interlayer (6) and a lower high-strength steel ball half (8). When the temperature of the worked out section rises, the temperature-sensing special smell liquid (4) is heated to be expanded, the glass ball (3) is squeezed and crushed, then special smell is released, the special smell is emitted to the worked out section through the cushioning light interlayer (6) and the small gas-releasing holes (1) in the surface of a high-strength steel ball, gas is diffused to corners on the work surface under the action of air leakage of the worked out section, the category of the smell of the gas flowing out of the positions, located at the corners, of the worked out section is tested, and whether the oxidizing temperature of the residual coal at a certain point of the worked out section reaches a set alarm value or not is judged.

Description

technical field [0001] The invention relates to the field of underground temperature detection in coal mines, and is suitable for detecting and alarming high-temperature points in goafs where personnel cannot reach places. Background technique [0002] After the underground coal is mined and exposed to the air, it slowly oxidizes with oxygen to generate heat. When the conditions are suitable, the temperature of the coal gradually rises to cause spontaneous combustion. Temperature detection is one of the main methods to judge the spontaneous combustion of underground coal in coal mines. However, limited by the specific conditions of mines, it is difficult to directly test the oxidation and thermal storage of residual coal in some places such as goafs. Currently proposed testing methods include contact and non-contact temperature measurement methods. Contact temperature measurement includes testing methods and devices such as thermocouples, thermal resistances, distributed op...

AI Technical Summary

Problems solved by technology

Contact temperature measurement includes testing methods and devices such as thermocouples, thermal resistances, distributed optical fibers, and gratings. The problem is that the signal transmission line of the device is easily broken due to the movement of rocks falling from the roof of the coal seam, and the reliability of the test is not high; The methods include infrared detection method and direct temperature measurement with temperature measuring device using wireless transmitting signals, and indirect detection by using methods such as magnetic anomalies, resistivity anomalies or radon gas changes caused by temperature rise in local locations underground.

There are many interference factors in wireless testing technology, and the location of infrared detection application has certain limitations. The magnetic anomaly and resistivity anomaly test are difficult, and these non-contact temperature measurement methods have certain limitations.

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