Experimental Investigation on the Heat Flux Distribution and Pollutant Emissions of Slot LPG/Air Premixed Impinging Flame Array

Haisheng Zhen, Baodong Du, Xiaoyu Liu, Zihao Liu and Zhilong Wei
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Haisheng Zhen: The Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China
Baodong Du: The Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China
Xiaoyu Liu: The Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China
Zihao Liu: The Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China
Zhilong Wei: The Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China

Energies, 2021, vol. 14, issue 19, 1-13

Abstract: Experiments were carried out to investigate the heat transfer and pollutants emission characteristics of a slot LPG premixed flame array impinging normally onto a flat plate. The effects of jet-to-jet spacing ( S / de ), nozzle-to-plate distance ( H / de ), and jet Reynolds number ( Re ) on the heat flux and emission index of CO, CO 2 , and NO x /NO 2 were examined. In addition, the thermal and emission characteristics between slot jets and circular jets were compared under identical experimental conditions. The results show that the more uniform heat flux distribution and higher total heat flux can be obtained at moderate jet-to-jet spacing, large jet-to-plate distance, and higher Reynolds number. EICO emissions can be influenced by the combined effects of jet-to-jet spacing, jet-to-plate distance, and higher Reynolds number. For the sake of the better combustion efficiency and lower EICO emission, the moderate jet-to-jet spacing ( S / de = 2.5), larger jet-to-plate distance ( H / de = 4), and relatively higher Reynolds number ( Re = 1500) are preferred for the slot jet flame array. Furthermore, it is found that there exists a trade-off between the EICO and EINOx of the slot LPG flame array. Compared with multiple circular flame jets, multiple slot flames jets have the higher area-averaged heat flux due to the larger heating area and more uniform heat flux distribution, while the higher EICO emission and lower EINO x emission are due to the greater jet interaction suppressing the air entrainment. Thus, it is known that the slot flame array has a better heating performance but relatively higher pollutant emissions than the circular flame array.

Keywords: LPG; slot impinging flame array; heat flux; pollutant emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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