Operational condition and furnace geometry for premixed C3H8/Air MILD combustion of high thermal-intensity and low emissions
Operational condition and furnace geometry for premixed C3H8/Air MILD combustion of high thermal-intensity and low emissions
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DOI：
10.1016/j.energy.2023.129905
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发表时间：
2023-12
期刊：
影响因子：
9
通讯作者：
Yi Wang;Kin-Pang Cheong;Junyang Wang;Shaotong Liu;Yong Hu;M. Chyu;Jianchun Mi
中科院分区：
文献类型：
--
作者：
Yi Wang;Kin-Pang Cheong;Junyang Wang;Shaotong Liu;Yong Hu;M. Chyu;Jianchun Mi
MILD combustion is usually operated at relatively low thermal intensity to achieve uniform temperature field and low pollutant emissions, further understanding of its emission characteristics at high thermal intensity condition is required to widen its application. In the present numerical study of premixed C3H8/air MILD combustion, different operational conditions (equivalence ratioΦand thermal inputPinput) and furnace geometries (side wall angle α and aspect ratioAR) are considered to reveal their correlations with pollutant emissions including CO, NOxand unburned hydrocarbon (UHC) at thermal intensities up to 1.06 MW/m3. By adopting reactor network calculation with detailed combustion chemistry, it is found thatARplays a notable role in controlling CO, NOxand UHC emissions, while NOxemission is insensitive to the variation of side wall angle. Both the CO and UHC emissions are related to the location of the internal recirculating vortex. Moreover, following the parametric study and NOxformation analysis, the optimized furnace geometry and operating condition ofAR= 5, α = 0° andΦ= 0.6 are obtained to significantly reduce the pollutant emissions by 90 % for both C3H8and CH4fuels. The present investigation offers valuable insights into the high thermal intensity MILD combustion.
