Accurate Division of'Three Zones'of Coal Spontaneous Combustion in Goaf Based on Closed Oxygen Consumption Test
In order to accurately divide the'three zones'of coal spontaneous combustion in goaf and improve the effectiveness of fire prevention and extinguishing measures in goaf,a method for determining the critical oxygen concentration of asphyxiation zone based on closed oxygen consumption test was pro-posed,and a data acquisition scheme for goaf was designed.Taking the 16402 working face of Laoshidan Mine of Wuhai Energy as an example,the closed oxygen consumption test of coal samples and the data col-lection of goaf were carried out,and the'three zones'of coal spontaneous combustion in goaf were divided according to the data results.Based on the divided'three zones'of coal spontaneous combustion in goaf,the original fire prevention and extinguishing measures in goaf were modified,the pertinence of fire prevention and extinguishing measures was improved,the investment cost was reduced,and the coal spontaneous com-bustion prevention and control was successfully carried out in 16402 working face.Practice shows that the ac-curate division method of coal spontaneous combustion'three zones'in this goaf is scientific and the division result is reliable.