Abstract
To realize the scientific judgment of spontaneous combustion risk in the coal mine, the spontaneous combustion influence factors were analyzed from the three aspects of coal spontaneous combustion tendency, air leakage, and oxygen supply, heat storage and heat dissipation. And the basis for the evaluation of t spontaneous combustion grade was constructed. Combination ordered weighted averaging (COWA) calculation was introduced to optimizes G1 subjective weighting, and a COWA modified G1 combined weighting cloud model was proposed to identify the spontaneous combustion risk in the coal mine. Finally, the rationality of the model was verified with actual cases. The research results show that the spontaneous combustion risk level in the Lingquan coal mine is relatively safe, which is consistent with the actual situation. And the spontaneous combustion tendency of coal is the leading factor affecting spontaneous combustion risk.
Highlights
To realize the scientific judgment of spontaneous combustion risk in the coal mine, the spontaneous combustion influence factors were analyzed from the three aspects of coal spontaneous combustion tendency, air leakage, and oxygen supply, heat storage and heat dissipation
It is of great significance to identify the main influencing factors of internal fire and scientifically identify the risk of internal fire to ensure the intrinsic safety of the coal mine s ystem[1,2]
Based on the above considerations, the causes of spontaneous combustion are analyzed comprehensively in the mine, and a combination ordered weighted averaging (COWA) modified G1 comprehensive weighting method is proposed based on combination numbers
Summary
The mine internal fire is the result of the comprehensive effect of internal and external factors of the system, in which the internal factor is the spontaneous combustion tendency of coal. The external factor includes the air leakage and oxygen supply conditions and heat storage and heat dissipation conditions[12]. Conditions of spontaneous combustion propensity of coal. The higher the degree of coal metamorphism, the higher the volatile content of coal, the easier the coal spontaneous combustion[2]. The higher the moisture content in coal, the higher the degree of coal looseness, and the higher the oxidation rate[13]. The higher the sulfur content of coal, the easier
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