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Research Article

Numerical study on combustion performance of propane non-premixed mild in O2/CO2 atmosphere

ORCID Icon, , , &
Received 28 Sep 2021, Accepted 17 Jan 2022, Published online: 23 Feb 2022
 

ABSTRACT

Moderate or intense low-oxygen dilution (MILD) combustion is one of novel clean combustion technologies. Propane MILD combustion in CO2/O2 atmosphere is investigated in a 20 KW MILD combustion furnace by numerical simulation. The results indicate propane MILD combustion is established and stable in O2/CO2 atmosphere instead of N2/O2 atmosphere, and O2/CO2 atmosphere leads to lower average temperature in the furnace, better temperature uniformity, as well as higher CO emission. The dilution concentration of CO2 affects the thermal and chemical performance in the propane MILD combustion, such as temperature distribution, propane pyrolysis, exothermic rate, free radical OH and CO distributions in the furnace. CO emission always keeps several thousand ppm in all CO2 cases, which indicates that CO emission and burnout are the key problem in propane MILD combustion in O2/CO2 atmosphere. It is concluded by analyzing these factors that in the range of 73%~85% of CO2 dilution concentration, the 79% Case presents best, which is closely related to the multiple effects of CO2 physical dilution, jet entrainment, jet penetration, and chemical reaction.

Acknowledgments

The authors gratefully acknowledge the support of National Natural Science Foundation of China (51976186).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [51976186].

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