Oxy-fuel (O2/CO2) combustion is one of the several promising new technologies which can realize the integrated control of CO2,SO2,NOX and other pollutants.However,when fuels are burned in the high CO2 concentration environment,the combustion characteristics can be very different from conventional air-fired combustion.Such changes imply that the high CO2 concentration atmosphere has impacts on the combustion processes.In this paper,the ignition time,laminar flame speed and adiabatic temperature property of C5~C7 n-alkane fuels were studied under both ordinary air atmosphere and O2/CO2 atmospheres over a wide range of CO2 concentration in the combustion systems.A new unified detailed chemical kinetic model was validated and used to simulate the three liquid hydrocarbon fuels flame characteristics.Based on the verified model,the influences of various parameters (atmosphere,excess oxygen ratio,O2 concentration,CO2 concentration,and alkane type) on the C5~C7 n-alkanes flame characteristics were systematically investigated.It can be concluded that high CO2 concentration atmosphere has negative effect on n-pentane,n-hexane and n-heptane flames ignition,laminar flame speed and adiabatic temperature.Besides,this work confirms that high CO2 concentration atmospheres chemical effects play a pronounced role on the flame characteristics,especially for the ignition time property.
Oxy-fuel Flame speed Ignition delay Adiabatic flame temperature Chemical Kinetics
Zhao Ran Liu Hao Zhong Xiaojiao Wang Zijian Jin Ziqin Chen Yingming Qiu Jianrong
State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan,430074,C State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan,430074,C State Key Laboratory of Coal Combustion,Huazhong University of Science and echnology,Wuhan,430074,Ch State Key Laboratory of Coal ombustion,Huazhong University of Science and Technology,Wuhan,430074,Ch State Key Laboratory of Coal ombustion,Huazhong University of Science and echnology,Wuhan,430074,Chi School of Environment & Urban Construction,Wuhan Textile niversity,Wuhan 430073,China State Key aboratory of Coal Combustion,Huazhong University of Science and echnology,Wuhan,430074,Chi