为明确低变质程度煤体的预警指标，以便采取有针对性的防灭火措施。采用程序升温的实验方法，改变通入气体的氧气浓度进行实验，以CO、C2H4、C2H2指标气体浓度为指标，构建低变质程度煤体煤自燃过程分级预警体系。研究发现，在30 ℃，氧气浓度5%、10%、21%条件下均监测到了CO，C2H4在5%氧气浓度下130 ℃开始出现，C2H4在10%和21%氧气浓度下110 ℃开始出现，除C2H6外，烷烃气体均随氧气浓度升高，临界温度降低。基于此，以沼和泉煤矿一号井5-3号煤层为背景，提出有针对性的低变质程度煤体煤自燃综合防治技术体系，该研究对于低变质程度煤体的矿井防灭火工作具有重要的实际意义。

 In order to clarify the warning indicators for low metamorphic coal bodies and take targeted fire prevention and extinguishing measures, the oxygen concentration of the introduced gas was changed for the experiment by using the experimental method of programmed heating. And the CO, C2H4, and C2H2 gas concentrations were used as indicators to construct a grading warning system for the spontaneous combustion process of low metamorphic coal. Research has found that CO was detected under conditions of 30 ℃ and oxygen concentrations of 5%, 10%, and 21%. C2H4 began to appear at 130 ℃ under 5% oxygen concentration, and at 110 ℃ under 10% and 21% oxygen concentration. Except for C2H6, all hydrocarbon gases showed a decrease in critical temperature with increasing oxygen concentration. Based on this, a targeted comprehensive prevention and control technology system for low metamorphic coal spontaneous combustion is proposed, taking the 5-3 coal seams of Well 1 in Zhaohequan Coal Mine as the background. This research has important practical significance for the mine fire prevention and control work of low metamorphic coal.