一、绪言在第1报中介绍了微量气体成分和臭味随着温度上升而产生的情况,认为早期发现煤自燃最有效的指标气体是一氧化碳。在推断自然发火状态时指出:氢和不饱和碳氢化合物是有效的指标气体。在现场一般考虑的自然发火征兆有:汽油、石油臭味等芳香族碳氧化合物这个因素。为了早期发现煤矿井下煤的自然,根据上述结果,研究了连续测定回风流中作为指标气体的一氧化碳,并进行自动监测异常的浓度(自然发火的区域监测系统,以下简称 I. INTRODUCTION In the first report, the trace gas composition and odor are introduced as the temperature rises. It is believed that the most effective indicator gas for spontaneous combustion of coal is carbon monoxide. In inferring the state of spontaneous combustion states: Hydrogen and unsaturated hydrocarbons are effective indicator gases. The general signs of spontaneous combustion at the scene are: gasoline, petroleum odors and other aromatic carbon oxides of this factor. In order to discover the nature of coal in coal mines at an early stage, the continuous measurement of carbon monoxide as the index gas in the return air flow and the automatic monitoring of the abnormal concentration have been studied (a natural fire area monitoring system, hereinafter referred to as