Study on The Relationship Between The Deeps of Coal Seam and The Quantity of CO2 Produced

Abstract

Based on the data by Xin-Wen Mining Group CO. LTD of Sun-Cun Coal Mine, the relationship between the geothermal gradient and the depth of mine in Suncun Coal Mine has been developed. According to this and the laboratory experiments, the relationship between the quantity of CO2 and the depth of coal mine has been obtained in this article. The results show that the curve on the period of time on spontaneous combustion of coal and the quantity of CO2 fit cubic polynomial expression in line. Especially when the quantity of CO2 produced exceeds 0.13 mol / (Kgmin), the period of time on spontaneous combustion of coal is unchanged. This law should be paid more attention to. Sun-Cun Coal Mine is in the territory of Xin-Tai City, which is located in the eastern side of Mount Tai in Shandong Province. The mine has been through six layer mining. The production conditions is becoming more and more deteriorating during the depth of coal mine reached - 600m. The physical properties of the coal mine in Sun-Cun Coal Mine is black, dark brown powder and the bulk density is 1.36. The hardness is small and the fracture has stair-step shape. The coal is brittle, fragile and the conductive is weak. The coal seams of bright coal, dull coal and vitrain have been wider intersected. It has band structure and the layer structure. There are occasionally fusain in interlayer. It is the low gaseous mine. Coal dust explosion index was 36.14% and the coal spontaneous combustion period is 57 days. Original ground temperature is expected to be 40℃ ~ 41℃ and the rock pressure is 2518.65 ~ 2863.60T/m 2 . The average thickness of 13# coal seam is 0.96m and the thickness varies between 0.72 ~ 1.37m. Its thickness has the trend of thiner from shallow to deep. The 13 # coal seam has complex structure and it has dirt band 3 to 5 layers. The lithology in dirt band is carbonaceous sandstone. It is hard and the layer is poor. The specific parameters of the 13# coal seam is in the table 1.