关键词: 遗煤自燃, 煤低温氧化, 指标气体, 二次氧化, 浸水风干

Abstract: The 31116 working face of Jinjie Coal Mine adopts the gob-side entry retention technology, and the air leakage in the gob has a large intensity and a wide range, which provides a continuous oxidation environment for the remaining coal, which is easy to cause secondary or multiple oxidation. Oxidation characteristics of leftover coal. In this paper, the low-temperature oxidation characteristics of raw coal, pre-oxidized coal, and water-soaked air-dried coal were systematically studied by temperature-programmed experiments, during the experiment, the spontaneous combustion characteristic parameters of the coal samples changed exponentially with the increase of temperature. CO can be used as an indicator gas between 30 and 110 °C, and C2H4 can be used as an indicator gas between 110 and 200 °C. Secondary oxidation The gas production, oxygen consumption rate and exothermic intensity were lower in the early stage of the reaction than in the initial oxidation, and higher in the later stage of the reaction. Compared with the raw coal samples, the temperature points at which CO and C2H4 were detected were 10~20°C earlier, the oxygen consumption rate increased by 173×10-11mol·cm3·s-1 at the highest, and the minimum and maximum exothermic intensity The highest increases were 211×10-5J·cm3·s-1 and 261×10-5J·cm3·s-1, respectively, indicating that the water immersion process has a certain promoting effect on the coal oxidation process.