摘要
为了研究受限空间内C2H6对瓦斯爆炸的影响,采用GRI Mech 3.0甲烷燃烧反应机理对定容燃烧反应器内瓦斯爆炸过程中压力、温度变化趋势进行详细分析,同时,对瓦斯爆炸过程中关键反应步进行敏感性分析。结果表明:混合气体中依次充入0.5%、1%、1.5%、2%的C2H6,瓦斯爆炸压力、温度明显增加。其中,与混合气不含C2H6相比,加入2%的C2H6后,达到瓦斯爆炸最大压力、最高温度所对应的CH4体积分数都提前了3%,且爆炸最大压力增大了0.004MPa,爆炸最高温度升高了20K;混合气中加入C2H6,促进CH4生成反应步的敏感性系数大幅度下降,促进CO、NO生成反应步的敏感性系数升高。C2H6对瓦斯爆炸起促进作用,且随着C2H6含量的增加,瓦斯爆炸强度增大,同时,C2H6促进致灾性气体CO、NO的生成。
In order to study the impact of C2H6 on gas explosion in confined space,the methane combustion reaction mechanism GRI Mech 3. 0 was applied to analyze the pressure and temperature variation trends during gas explosion process in constant volume combustion reactor in detail,and the sensitivity analysis of key reaction steps in gas explosion was conducted. The results showed that： when the mixed gas was filled sequentially with C2H6 whose content was 0. 5%,1%,1. 5%,2% respectively,the gas explosion pressure and temperature increased significantly. Compared with that without C2H6 in mixed gas,when adding 2% C2H6,the volume fraction of CH4 corresponding to reach the maximum pressure and temperature in gas explosion was in advance of 3%. The maximum explosion pressure increased 0. 004 Mpa,and the maximum explosion temperature increased 20 K. When adding C2H6,the sensitivity coefficient of reaction steps promoting CH4 formation declined significantly,while the sensitiv-ity coefficient of reaction steps promoting CO and NO formation increased. C2H6 can promote the gas explosion,and with the increase of C2H6 content,the intensity of gas explosion increases,at the same time,C2H6 promotes the formation of hazard gas such as CO and NO.
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2015年第10期17-22,共6页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(51274113
51174109)
关键词
受限空间
瓦斯爆炸
乙烷
敏感性分析
数值模拟
confined space
gas explosion
ethane
sensitivity analysis
numerical simulation
