Coal bed gas radio spectrum direction-finding early warning system

Abstract

The invention discloses a coal bed gas radio spectrum direction-finding early warning system. A radio astronomy modulation radiation receiving system is used to receive gas radio steady state and unsteady state radiation temperature signals in a gas enriched region in a coal bed so as to indirectly measure the coal bed gas pressure; a radio astronomy full-power radiation receiving system is used to receive gas radio unsteady state and quickly variable radiation intensity and form signals in the gas enriched region in the coal bed so as to judge the gas radio radiation type and variation rate; and a radio astronomy spectrum radiation receiving system is used to receive gas radio unsteady state and quickly variable radiation spectrum peak and frequency drift in the gas enriched region in the coal bed so as to early warn the coal gas outburst. Due to the fit of the maximum values of the three signals under different antenna bearings and elevations, and the trigonometry measurement, the direction and normal distance of the gas enriched region are measured.

Description

technical field [0001] The invention relates to the measurement of gas pressure in coal rock formations in coal mine excavation, more specifically a radio astronomical modulation, full power, spectrum and absolute calibration method to more accurately measure the radiation temperature, relative Intensity, frequency spectrum, azimuth and normal distance, and then establish a mathematical model and data processing through actual measurement to obtain the attenuation coefficient per unit length of the coal seam to calculate the radiation flow of the gas source itself, and then cooperate with the drilling to measure the pressure of the gas source to obtain a geological and coal seam The relationship between the radiation flow rate and the pressure of the gas source under certain conditions is used to measure the gas pressure in the gas-enriched area of ​​the coal bed and the coal seam gas radio frequency spectrum direction finding early warning system for early warning of coal tile...

AI Technical Summary

Problems solved by technology

Borehole detection, geoacoustic detection, microseismic detection, electromagnetic detection and other methods used in coal mines in the past, the first three of these methods are contact detection, or the gas pressure is difficult to measure in real time due to the difficulty of measuring the hole position and depth ; or because it is not sensitive enough and susceptible to noise interference, it is difficult to establish a gas pressure model; or it is difficult to apply it in the mining site because of the huge equipment; although the latter is non-contact detection, it is difficult to interfere with pulses in a single-channel test based on pulse counting Therefore, the false alarm rate is high, and it is a nonlinear detection, so it is difficult to establish a gas pressure model; therefore, the existing technology cannot solve the gas pressure and orientation measurement inside the coal seam and the early warning of coal tile outburst.

Although coal mines have successively established roadway gas detection and monitoring systems, they can only detect the concentration of gas in the roadway air that has infiltrated from the coal seam, but cannot detect the gas content in the coal seam in front of the mining face. Fundamentally solve the problem of prediction and prevention of gas explosion caused by the instantaneous increase of gas concentration caused by coal and gas outburst

Generally speaking, the coal seam gas testing methods currently used in coal mining are essentially non-linear, single-channel, single-physical-quantity hardware measurement equipment

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