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坑道瓦斯热着火的实验研究对丰富爆炸安全科学理论体系、研发防火防爆技术与装备具有重要意义。对坑道瓦斯空气混合气在高温热源条件下的热着火现象进行实验研究。根据实验结果,详细讨论了瓦斯的热着火方式、临界着火温度以及浓度、温度的变化规律。实验发现:高温热源条件下瓦斯混合气的着火模式为燃烧、热爆燃;瓦斯引燃分为热裂解、快速氧化反应、加速氧化反应3个阶段;瓦斯在自燃点附近开始快速化学反应,热着火临界温度高于自燃点近80 K;温度特征曲线在着火时具有突变性质。
Experimental study of tunnel gas heat is of great significance for enriching scientific theory system of explosion safety and developing fire prevention and explosion protection technology and equipment. The experimental study on the thermal ignition phenomenon of the mixture gas of tunnel methane gas under the condition of high temperature and heat source is carried out. According to the experimental results, the laws of thermal ignition, critical ignition temperature, concentration and temperature of gas are discussed in detail. The experimental results show that the ignition mode of gas mixture under high temperature and heat source conditions is combustion and thermal deflagration. The gas ignition is divided into three stages: thermal cracking, rapid oxidation and accelerated oxidation. The gas begins rapid chemical reaction near the self-ignition point, The critical temperature is higher than the self-ignition point of nearly 80 K; temperature characteristic curve has a sudden change in the fire.