Method for estimating coal oxidation temperature rise based on underground measured gas concentration values

Abstract

The invention discloses a method for calculating coal oxidation temperature rise based on underground measured gas concentration values. According to the method, a relation curve of coal spontaneous combustion temperatures and gas concentration ratios in a laboratory environment is drawn; the average slope of the curve between any two adjacent points is calculated; the difference between the absolute values of the average slopes of every two consecutive groups of adjacent points is calculated; a point where the difference value is maximum is the feature point of the curve; a temperature valuecorresponding to the feature point is a coal spontaneous combustion inflection point temperature; with the ratio of a measured gas concentration value obtained under the normal temperature of coal inan underground environment to a measured gas concentration value obtained under the ignited state of the coal adopted as an end point, the feature points of the relation curve of coal spontaneous combustion temperatures and gas concentration ratios in the underground environment are determined on the basis of a similar triangle principle, so that the relation curve of the coal spontaneous combustion temperatures and the gas concentration ratios in the underground environment is fitted; and finally, underground coal oxidation temperature rise can be calculated. The method for calculating the coal oxidation temperature rise of the invention is logical, scientific and reliable, and improves the accuracy of coal spontaneous combustion prediction in an underground environment.

Description

technical field [0001] The invention relates to a method for estimating the temperature rise of coal oxidation, in particular to a method for estimating the temperature rise of coal oxidation based on the gas concentration value measured underground. Background technique [0002] Mine fire is one of the main disasters in coal mines, among which coal spontaneous combustion fire accidents caused by air leakage from coal cracks account for more than 90% of the total number of mine fires. Mine fires will burn a lot of coal resources and equipment; generate a lot of high-temperature smoke and harmful gases, seriously endangering the lives of underground personnel. Simultaneously coal spontaneous combustion often causes gas explosion and coal dust explosion, further expands the disaster of mine fire. Mine fires caused by coal spontaneous combustion led to the closure of a large number of coal mining faces, which caused tens of millions of tons of coal to be frozen. It has brough...

AI Technical Summary

Problems solved by technology

Due to factors such as air leakage in coal and rock mass cracks in the mine that affect the change of coal oxidizing gas concentration, the data of coal spontaneous combustion obtained in the laboratory is quite different from the actual situation of the mine, so it is impossible to accurately calculate the spontaneous combustion of coal.

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