Method for detecting coal field fire district distribution range

Abstract

The invention provides a method for detecting a coal field fire district distribution range, which is applicable to detection of coal field fire distribution ranges and development degree. According to the characteristic that coal field fire often happens in a coal petrography scattering area, a geological radar and a transient electromagnetic instrument detect electromagnetic wave amplitudes and secondary induction electromagnetic fields in a detection area, and a distribution range of the coal petrography scattering area in the detection area is defined. Gas measurement drill hole is constructed in the defined coal petrography scattering area in the detection area, gas in the drill hole is sampled, and compositions and concentrations of carbon monoxide, acetylene and ethylene in a gas sample is analyzed. A gas concentration distribution contour map is developed according to analysis results of the gas sample, the area with low concentration is the edge of the fire district, and the area with high concentration is the area with serious fire district development degree. By means of pre-detection of the coal petrography scattering area, pertinence of the fire district detection drill hole is improved, construction amount of the detection drill hole is reduced, and detection cost is saved. The method for detecting the coal field fire district distribution range is simple and high in detection accuracy, and has wide practical applicability in the field of detection of the coal field fire district.

Description

technical field [0001] The invention relates to a method for detecting the distribution range of coalfield fires, and is especially suitable for detecting the distribution range and development degree of coalfield fires. Background technique [0002] In my country's Xinjiang, Inner Mongolia, Shanxi, Ningxia, Gansu, Qinghai and other provinces (autonomous regions), there are a large number of coalfield fire areas. The existence of a large number of coalfield fires not only directly burns non-renewable coal resources, but also indirectly causes dozens of times of sluggish resources to be unavailable, and directly threatens the safe production of coal mines and the local ecological environment and groundwater resources. According to incomplete statistics, the amount of coal burned by coal fires in my country reaches 10 million tons every year, and the economic loss exceeds 20 billion. In order to achieve efficient control of coal fires and reduce resource loss and environmenta...

AI Technical Summary

Problems solved by technology

The borehole temperature measurement method uses thermocouples, infrared thermometers and other temperature measuring instruments to test the temperature in the borehole after drilling in the fire area, and judges the distribution and development degree of the fire area according to the temperature of the borehole; this method It is the most direct method, but due to the poor thermal conductivity of coal and rock, in order to achieve a more accurate detection of the fire area, it is necessary to intensively drill holes in the entire detection area (generally, the hole spacing is less than 10m), and the workload is large and the cost is high. High; the magnetic method delineates the boundary of the fire area by detecting the thermal remanence generated by the burnt rock in the fire area, but the burnt rock can generally produce significant thermal remanence only when the temperature is higher than 400 °C. For the area below 400 °C due to its The generated thermal remanence is low, resulting in poor detection accuracy; therefore, this method cannot meet the detection requirements in areas below 400°C

The radon measurement method judges the distribution of coalfield fire areas through the detection of radon elements in the detection area. It is believed that the greater the concentration of radon elements, the more serious the development of fire areas. , the development degree of fissures, etc. are greatly affected, resulting in low detection accuracy of this method; the remote sensing method is suitable for the detection of fire areas with obvious temperature anomalies on the surface, and is not suitable for the detection of fire areas where the surface temperature is not obvious