爆炸与冲击2025，Vol.45Issue(11)：98-107,10.DOI:10.11883/bzycj-2024-0359
O2/CO2气氛下CO2对乙炔可燃下限的影响
Effect of CO2 on the lower flammability limit of acetylene in O2/CO2 atmosphere
摘要
Abstract
Oxy-fuel combustion is one of the effective means to reduce greenhouse gases.To grasp the combustion characteristics of the clean fuel acetylene in O2/CO2 atmosphere and to investigate the effect of different CO2 volume fraction on the lower flammable limit of acetylene,the lower flammable limit of acetylene was experimentally measured in a 5 L cylindrical explosive reaction device.With the increase of CO2 volume fraction from 14%to 85%,the experimental value of the lower flammable limit of acetylene increased from 2.64%to 3.93%,which was linearly increased in a small range.Compared with hydrocarbon fuels such as ethylene,ethane,and propylene,the lower flammability limit of alkanes,olefins,alkynes decrease sequentially,indicating that alkynes have a larger combustion range and a higher hazard factor.Based on the calculation model of limiting laminar burning velocity method,a prediction model applicable to the lower flammability limit of acetylene was established.Through the verification of experimental data,the average absolute error of this prediction model using the USCⅡcombustion reaction mechanism is at 0.52%,and the model is accurate and reliable.To explain the reason for the existence of the lower flammability limit from the perspective of the competition between the temperature rise of the heat generation from fuel consumption and the temperature drop of the heat dissipation from the expansion of the fuel body,this study examines the thermodynamic,chemical,and transport effects of CO2 on the lower flammability limit.The combustion reaction mechanism of USCⅡis modified to incorporate the virtual substances FCO2,TCO2,and MCO2,and comparing the flammability limits of the three virtual substances as well as those of the five atmospheres of N2 and CO2.The thermodynamic,chemical and transport effects of CO2 on the lower flammability limit were discussed.The results show that the average proportion of thermodynamic effect is 64%,chemical effect is 35%and transportation effect is 1%.关键词
乙炔/O2/CO2/可燃下限/极限层流速度法Key words
acetylene/O2/CO2/lower flammability limit/limiting laminar velocity method分类
力学引用本文复制引用
李家瑶,梁容真,胡贤忠..O2/CO2气氛下CO2对乙炔可燃下限的影响[J].爆炸与冲击,2025,45(11):98-107,10.基金项目
辽宁省自然科学基金(2023-1SBA-100) （2023-1SBA-100）
中央高校基本科研业务费专项资金(N2425018) （N2425018）
