混氢天然气燃烧特性及灭火剂抑制研究  

Hydrogen Compressed Natural Gas Combustion Characteristics and Fire Extinguishing Agent Suppression Study

作　　者：王润晴 谢永亮 陈兵 Wang Runqing;Xie Yongliang;Chen Bing(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu,610031)

机构地区：[1]西南交通大学机械工程学院,成都610031

出　　处：《制冷与空调（四川）》2023年第6期776-783,789,共9页Refrigeration and Air Conditioning

摘　　要：利用Chemkin-Pro对混氢天然气层流预混火焰速度进行数值模拟研究,从化学动力学的角度讨论混氢比对混氢天然气层流预混火焰速度的影响,结果表明,FFCM1.0机理能够较准确的预测混氢天然气层流预混火焰速度;随着混氢比的增加,混氢天然气的层流预混火焰速度逐渐升高,在混氢比大于60%时,火焰速度增幅更显著。对三氟甲烷(HFC-23)、五氟乙烷(HFC-125)、七氟丙烷(HFC-227ea)三种灭火剂抑制层流火焰速度的能力进行研究分析,发现HFC-227ea对层流火焰速度具有更好的抑制效果,进一步研究了HFC-227ea对层流火焰速度的影响。结论表明:在未观察到不良反应浓度范围内,HFC-227ea浓度越高,层流火焰速度越低;燃烧当量比在1.5左右,该灭火剂对层流火焰速度有增强的效果。Numerical simulation study on the laminar premixed flame speed of mixed hydrogen natural gas was carried out by Chemkin-Pro,and the effect of hydrogen mixing ratio on the laminar premixed flame speed of mixed hydrogen natural gas was discussed from the perspective of chemical kinetics,and the results showed that the FFCM1.0 mechanism could predict the laminar premixed flame speed of mixed hydrogen natural gas more accurately;the laminar premixed flame speed of mixed hydrogen natural gas rised with the increase of hydrogen mixing ratio,and the flame speed increased more significantly when the hydrogen mixing ratio was more than 60%.The ability of three extinguishing agents,HFC-23,HFC-125 and HFC-227ea,to suppress the laminar flame speed was studied and analysed,and it was found that HFC-227ea had a better suppression effect on the laminar flame speed,and the effect of HFC-227ea on the laminar flame speed was further investigated.The conclusions showed that:in the concentration range where no adverse reaction was observed,the higher the concentration of HFC-227ea,the lower the laminar flame speed;with a burning equivalence ratio of about 1.5,the extinguishing agent had an enhanced effect on the laminar flame speed.

关 键 词：混氢天然气 层流火焰 七氟丙烷(HFC-227ea) 

分 类 号：TK91[动力工程及工程热物理]