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沿采空区倾向布置５个测点，对采空区气体成分及温度进行测定，确定出三河尖煤矿７１２１下综采放顶煤工作面采空区自燃“三带”的范围，并对该工作面始终出现ＣＯ的原因进行了合理解释．
Five measuring points are arranged along the goaf, and the gas composition and temperature in the goaf are determined to determine the range of spontaneous combustion “three belts” in the goaf of the fully mechanized top coal caving face 7121 in Sanhejian Coal Mine. The cause of CO always appears reasonable explanation.