Work face 3312 of coal mining in a colliery was taken as an example in which methane data in a series of locations was analyzed.For the purpose of data analysis, work face 3312 was divided into sections with 20 powere...Work face 3312 of coal mining in a colliery was taken as an example in which methane data in a series of locations was analyzed.For the purpose of data analysis, work face 3312 was divided into sections with 20 powered supports and some measur- ing-points in a section.Through analysis based on the sectional control volume model,the following points are concluded: (1) the location of gob air flow begins flow into coal face in 70 m away from the haulage gallery;(2) in the control volumes No.10 and No.30,the ra- tios of methane intensity from coal face into gob to the methane intensity in the corre- sponding control volume are 30% and 22%;(3) in the control volume No.50 to No.110,the ratios of methane intensity from gob into coal face to the methane intensity in the corre- sponding control volume are 4%,17%,22% and 53%,respectively.展开更多
文摘Work face 3312 of coal mining in a colliery was taken as an example in which methane data in a series of locations was analyzed.For the purpose of data analysis, work face 3312 was divided into sections with 20 powered supports and some measur- ing-points in a section.Through analysis based on the sectional control volume model,the following points are concluded: (1) the location of gob air flow begins flow into coal face in 70 m away from the haulage gallery;(2) in the control volumes No.10 and No.30,the ra- tios of methane intensity from coal face into gob to the methane intensity in the corre- sponding control volume are 30% and 22%;(3) in the control volume No.50 to No.110,the ratios of methane intensity from gob into coal face to the methane intensity in the corre- sponding control volume are 4%,17%,22% and 53%,respectively.
