摘要
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 on the thermal ignition of gas in underground tunnel is of great significance for enriching scientific theories system of explosion safety and developing technology and equipment of fire-proof.In this paper,experimental investigation about gas ignition phenomena induced by thermal source have been carried out in a confined space.According to experimental results,the ignition manner of gas,the critical ignition temperature and the changes law of concentration,temperature in the course of fire have been discussed in detail.It has been found that the ignition course of gas in the confined space is divided phase,namely： pyrolysis of gas,oxidation reaction of gas-air mixture,accelerated oxidation reaction of gas air mixture.There are two ignition manners of gas caused by thermal source,namely combustion,deflagration.Gas in the confined space starts its rapid chemical reaction at the spontaneous combustion temperature of gas.And its ignition temperature is about 80K higher than spontaneous combustion point of gas;.Regardless of region of the fire,or other region in the space,there is sudden rise of temperature at the time of ignition.
出处
《煤矿安全》
CAS
北大核心
2011年第2期4-7,共4页
Safety in Coal Mines
基金
解放军后勤工程学院青年基金资助项目(YQ09-42601)
重庆市自然科学基金资助项目(CSTC
2009BA6019)
关键词
地下坑道
热源
热着火
瓦斯
underground tunnel
thermal source
thermal ignition
gas
