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Experimental and numerical studies on the effect of packed bed length on CO and NOx emissions in a plane-parallel porous combustor

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  • Shi, Junrui
  • Liu, Yongqi
  • Mao, Mingming
  • Lv, Jinsheng
  • Wang, Youtang
  • He, Fang

Abstract

Gas diffusion combustion in a plane-parallel packed bed filled with 2.5 mm alumina pellets is experimentally and numerically investigated. Special attention is focused on the influence of bed length (h) on the CO and NOx emissions for different excess air ratios (α) and gas mixture velocities (ug,in). It is found that h has significant influence on NOx emission when h < 120 mm. NO emission decreases dramatically with h due to decrease in flame temperature in open space above the porous zone. However, the influence of h on NOx emission becomes less important when h > 120 mm. Increase in h always leads to an linear increases in CO emission over the bed length range from 40 mm to 200 mm regardless of α and ug,in. For the lowest α (1.88), good performance regarding CO emission is observed, CO emission increases from 2 ppm to 49 ppm when h increases from 40 mm to 200 mm. Moreover, wide high temperature zone of the external combustor walls indicates that it is feasible to develop radiative burner based on diffusion filtration combustion.

Suggested Citation

  • Shi, Junrui & Liu, Yongqi & Mao, Mingming & Lv, Jinsheng & Wang, Youtang & He, Fang, 2019. "Experimental and numerical studies on the effect of packed bed length on CO and NOx emissions in a plane-parallel porous combustor," Energy, Elsevier, vol. 181(C), pages 250-263.
    • Handle: RePEc:eee:energy:v:181:y:2019:i:c:p:250-263
    DOI: 10.1016/j.energy.2019.05.141
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    References listed on IDEAS

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    1. Keramiotis, Christos & Stelzner, Björn & Trimis, Dimosthenis & Founti, Maria, 2012. "Porous burners for low emission combustion: An experimental investigation," Energy, Elsevier, vol. 45(1), pages 213-219.
    2. Fan, Aiwu & Zhang, He & Wan, Jianlong, 2017. "Numerical investigation on flame blow-off limit of a novel microscale Swiss-roll combustor with a bluff-body," Energy, Elsevier, vol. 123(C), pages 252-259.
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    Cited by:

    1. Zangeneh, Vahid & Alipoor, Alireza, 2021. "Stability study of hydrogen-air flame in a conical porous burner," Energy, Elsevier, vol. 215(PB).
    2. Shi, Yueyue & Liu, Yongqi & Zhou, Yuqi & Shi, Junrui & Qi, Xiaoni & Mao, Mingming, 2023. "Study in mitigation of lean methane and stable heat recovery via embedded heat exchanger tubes in the regenerative monolith bed," Renewable Energy, Elsevier, vol. 218(C).
    3. Dai, Hongchao & Dai, Huaming, 2022. "Green hydrogen production based on the co-combustion of wood biomass and porous media," Applied Energy, Elsevier, vol. 324(C).

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