Coal field fire district detection method adopting magnetic-electric-heat gradual source seeking mode

Abstract

The invention relates to a coal field fire district detection method adopting a magnetic-electric-heat gradual source seeking mode. After the underground coal fire spreading direction is determined according to magnetic anomaly boundary, a magnetic anomaly maximum zone and a natural potential anomaly boundary of a fire district detection area, drilling construction is performed, and a burning center zone, a high-temperature zone and a low-temperature zone of the fire district are determined according to the highest temperature and concentrations of C2H4 and C2H2 in drilled holes. The magnetic-electric-heat gradual source seeking mode is adopted, the fire district detection range determined by detecting the coal loose area is narrowed, measurement of the high-temperature zone and the fire source position in the fire district is targeted, the drilling cost is reduced, the detection efficiency is improved, errors caused with a single drilling temperature measurement technology are reduced, the fire source position and the high-temperature zone range in the coal field fire district are efficiently detected, the construction amount of drilling for detection is reduced, and the method has broad practicability.

Description

technical field [0001] The invention relates to a method for detecting a fire area in a coal field, in particular to a method for detecting a fire area in a coal field in which magnetism, electricity and heat approach the source step by step. Background technique [0002] Coalfield fire refers to the phenomenon of large-scale coal combustion that gradually develops along the coal seam after the underground coal seam ignites due to natural or human factors, causing great harm to coal resources and the surrounding environment. Coalfield fires not only burn a large number of coal resources and sluggish a large number of coal resources can not be mined, but also produce a large amount of CO, CO 2 , SO 2 Toxic and harmful gases such as mercury, selenium and other harmful chemicals that pollute soil and water resources. Coalfield fires need to be controlled urgently, and accurate detection of coalfield fires is of great practical significance for improving the effectiveness and ...

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Problems solved by technology

Among them, the remote sensing detection technology is mainly used for the detection of surface surface fires, and it is difficult to detect underground coal fires; the surface gas detection and isotope radon detection technologies are easily affected by external factors such as the depth of the fire source, the properties of the overlying rock strata in the fire area, and climate conditions. , poor anti-interference; borehole temperature measurement can be directly close to the fire source to measure the temperature, but if the borehole temperature measurement is simply used in a large coalfield fire area, it will be time-consuming, laborious and expensive

Therefore, the current coal fire detection technology is still unable to achieve accurate and efficient detection of the location of the fire source in the coalfield fire area and the range of the high temperature area.

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