In thermal powered direct blow coal powder manufacturing at high-temperatures, the mechanism and key parameters of the spontaneous combustion of coal powder are not clear, which makes the prevention of such spontaneous combustion difficult. Therefore, the spontaneous combustion of coal powder for different oxygen concentrations (oxygen concentrations of 5, 7, 9, 13, 17, 21%) and volumes (21, 200, 300, 400, and 500 cm³) in a high-temperature environment was studied experimentally by the physical similarity simulated experimental appliance. The results indicate that when the oxygen concentration in the coal powders from the LHG sample (Liuhuanggou mine coal sample) and Hongliu mine coal sample (HL sample) samples was higher than 13% and 9%, respectively, the temperature of the center-point rises rapidly beyond other conditions. As the temperature increases, the concentrations of the CO and C₂H₄ gases increase gradually and the CO/CO₂ ratio increases exponentially. However, the C₂H₄/C₂H₆ ratio is unstable when the temperature is lower than 180°C, beyond which it gradually increases. The minimum ignition temperature of the coal powder increases gradually with the decrease in the oxygen concentration, and the ignition delay time is also prolonged considerably.

在高温下火力直吹煤粉生产中，煤粉自燃的机理和关键参数尚不明确，给预防自燃带来了困难。因此，不同氧气浓度（氧气浓度为5、7、9、13、17、21%）和体积（21、200、300、400和500 cm ³) 在高温环境下通过物理相似性模拟实验装置进行了实验研究。结果表明，当 LHG 样品（六皇沟矿煤样品）和红柳矿煤样品（HL 样品）的煤粉中氧浓度分别高于 13% 和 9% 时，中心点温度迅速上升超过其他条件。随着温度的升高，CO和C ₂ H ₄气体的浓度逐渐增加，CO/CO ₂比呈指数增加。然而，C ₂ H ₄ /C ₂ H ₆当温度低于 180°C 时，比率不稳定，超过该比率会逐渐增加。煤粉的最低着火温度随着氧气浓度的降低而逐渐升高，着火延迟时间也显着延长。