Index gas based goaf coal spontaneous combustion hazard level judgment and prewarning method

Abstract

The invention discloses an index gas based goaf coal spontaneous combustion hazard level judgment and prewarning method. The method comprises the steps of 1, arranging a coalmine goaf coal spontaneous combustion index gas monitoring device; 2, acquiring and transmitting coalmine goaf coal spontaneous combustion index gas concentrations; and 3, performing analysis processing on each gas concentration of a coalmine goaf as well as the CO concentration, the C2H4 concentration and a temperature signal detected by a temperature sensing probe by a ground monitoring computer, and performing coal fire hazard risk prewarning. The method is simple in step, novel and reasonable in design, convenient to realize, high in automation degree, high in reliability, comprehensive and accurate in goaf coal spontaneous combustion degree prediction, wide in application range, high in practicality, good in use effect and convenient to popularize and use.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a method for judging and early warning of coal spontaneous combustion risk degree in goafs based on index gas. Background technique [0002] Coal spontaneous combustion fire is one of the five major disasters that seriously threaten the safe production of coal mines in China. 56% of my country's key state-owned coal mines have the danger of coal spontaneous combustion, and coal spontaneous combustion in goafs accounts for the vast majority of coal spontaneous combustion fires in mines. The roof management of the goaf adopts the spontaneous combustion and caving method. After mining, the goaf will be covered by the caving of the upper layer of rock, so that the state of spontaneous combustion of the coal left in the goaf cannot be directly and simply detected. Therefore, the coal left in the goaf The determination of the degree of spontaneous combustion is still...

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Problems solved by technology

[0002] Coal spontaneous combustion fire is one of the five major disasters that seriously threaten the safe production of coal mines in China. 56% of my country's key state-owned coal mines have the danger of coal spontaneous combustion, and coal spontaneous combustion in goafs accounts for the vast majority of coal spontaneous combustion fires in mines. The roof management of the goaf adopts the spontaneous combustion and caving method. After mining, the goaf will be covered by the caving of the upper layer of rock, so that the state of spontaneous combustion of the coal left in the goaf cannot be directly and simply detected. Therefore, the coal left in the goaf Determining the degree of spontaneous combustion is still a problem that plagues the safe production of coal mines in my country

However, the traditional goaf monitoring and coal spontaneous combustion determination methods mainly include the goaf bundle tube monitoring system, which can only monitor the spontaneous combustion of coal remaining in the goaf within a small range of the two working faces. The monitoring effect of a large number of personnel maintenance work is not good, and the wireless monitoring of the goaf can arrange measuring points within a certain range. However, the wireless signal in the goaf can only transmit 5 to 10m, and it uses multi-hops to transmit information. The complex environment of the goaf requires a large number of points to accurately monitor the spontaneous combustion of coal in the goaf, and the cost is too high and the reliability is not high

At present, the CO gas produced in the process of coal spontaneous combustion is generally used as the index gas for predicting the spontaneous combustion of coal seams at home and abroad. The degree of coal spontaneous combustion can be judged by the amount of CO gas produced in the process of coal spontaneous combustion. Its own disadvantage is that it cannot accurately and completely collect the gas produced during the spontaneous combustion of coal left in the goaf, so it can only roughly determine the degree of spontaneous combustion of coal in the goaf

Moreover, it is impossible to accurately locate and determine the specific coal spontaneous combustion state in the goaf, which brings great difficulties to the efficient and accurate prevention of coal spontaneous combustion fires in the goaf, and consumes manpower and material resources in the fire prevention process

Due to the inability to accurately locate and determine which part of the goaf coal spontaneous combustion is more dangerous, the fire prevention and control effect of coal spontaneous combustion in the goaf is not good

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