太平洋炭鉱における炭層ガスとガス抜きに関する研究 (第1報)

Abstract

In Taiheiyô Coal Mine, the “Honsô” (main seam) and the “Kasô” (lower seam) of Harutori coal bearing formation are now under working. In this mine, methane content in the whole exhaust gas is 25 to 28m3 per ton of out put. We assume that methane content increases as the working area goes deeper.In this paper, occluded gas in the coal seam, speed of gas discharging, possible amount of methane for drainage, etc. shoold be treated.(1) The coal seam is an only source of methane gas in this mine. The auther has tried to classify the occluded gas in the coal seam into self-spouting gas and non self-spouting gas from the practical point of view.(2) The total gas content occluded in the coal seam lies between 5.8 and 6.00m3/t, made up of 1.80m3/t of self-spouting and 4.00 to 4.20m3/t of non self-spouting.(3) Generally speaking, gas discharged from the entries in self-spouting, while that from the working long-wall faces is non self-spouting.(4) When the coal is cut, 2.0m3/t of the non self-spouting gas is released from it within a week or so, and the remaining gas discharges gently.(5) The gas which discharged in the term of initial disturbance is possible to be drained effectively. And the volume of gas discharged out of the working long-walls is presumed as 6.0m3/min in pure at minimum.(6) The composition of obtained “pure” coal seam gas is as follows CH4 93-96% O2 0.1-2.7%CO2 tr-0.9 N2 3.2-4.5(7) The composition of the original coal seam gas is difficult to determine except for large amount of self-spouting gas, because we could not get the sample gas of original state ever obtained gas has been influenced for few days already by ventilatin air before the sampling.