Abstract
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 fuel’s 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-alkane’s 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 flame’s ignition, laminar flame speed and adiabatic temperature. Besides, this work confirms that high CO2 concentration atmosphere’s chemical effects play a pronounced role on the flame characteristics, especially for the ignition time property.
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Acknowledgment
This work was supported by National Natural Science Foundation of China (No. 51078163, 50976041, 51021065, 50976081).
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Zhao, R. et al. (2013). The Ignition Delay, Laminar Flame Speed and Adiabatic Temperature Characteristics of n-Pentane, n-Hexane and n-Heptane Under O2/CO2 Atmosphere. In: Qi, H., Zhao, B. (eds) Cleaner Combustion and Sustainable World. ISCC 2011. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30445-3_10
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DOI: https://doi.org/10.1007/978-3-642-30445-3_10
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