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Effects of operating conditions and fuel properties on emission performance and combustion efficiency of a swirling fluidized-bed combustor fired with a biomass fuel

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  • Kuprianov, Vladimir I.
  • Kaewklum, Rachadaporn
  • Chakritthakul, Songpol

Abstract

This work reports an experimental study on firing 80kg/h rice husk in a swirling fluidized-bed combustor (SFBC) using an annular air distributor as the swirl generator. Two NOx emission control techniques were investigated in this work: (1) air staging of the combustion process, and (2) firing rice husk as moisturized fuel. In the first test series for the air-staged combustion, CO, NO and CxHy emissions and combustion efficiency were determined for burning “as-received” rice husk at fixed excess air of 40%, while secondary-to-primary air ratio (SA/PA) was ranged from 0.26 to 0.75. The effects of SA/PA on CO and NO emissions from the combustor were found to be quite weak, whereas CxHy emissions exhibited an apparent influence of air staging. In the second test series, rice husks with the fuel-moisture content of 8.4% to 35% were fired at excess air varied from 20% to 80%, while the flow rate of secondary air was fixed. Radial and axial temperature and gas concentration (O2, CO, NO) profiles in the reactor, as well as CO and NO emissions, are discussed for the selected operating conditions. The temperature and gas concentration profiles for variable fuel quality exhibited significant effects of both fuel-moisture and excess air. As revealed by experimental results, the emission of NO from this SFBC can be substantially reduced through moisturizing rice husk, while CO is effectively mitigated by injection of secondary air into the bed splash zone, resulting in a rather low emission of CO and high (over 99%) combustion efficiency of the combustor for the ranges of operating conditions and fuel properties.

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  • Kuprianov, Vladimir I. & Kaewklum, Rachadaporn & Chakritthakul, Songpol, 2011. "Effects of operating conditions and fuel properties on emission performance and combustion efficiency of a swirling fluidized-bed combustor fired with a biomass fuel," Energy, Elsevier, vol. 36(4), pages 2038-2048.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:4:p:2038-2048
    DOI: 10.1016/j.energy.2010.05.026
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    2. Duan, Feng & Liu, Jian & Chyang, Chien-Song & Hu, Chun-Hsuan & Tso, Jim, 2013. "Combustion behavior and pollutant emission characteristics of RDF (refuse derived fuel) and sawdust in a vortexing fluidized bed combustor," Energy, Elsevier, vol. 57(C), pages 421-426.
    3. Díaz-Ramírez, Maryori & Sebastián, Fernando & Royo, Javier & Rezeau, Adeline, 2012. "Combustion requirements for conversion of ash-rich novel energy crops in a 250 kWth multifuel grate fired system," Energy, Elsevier, vol. 46(1), pages 636-643.
    4. Cong, Kunlin & Zhang, Yanguo & Han, Feng & Li, Qinghai, 2019. "Influence of particle sizes on combustion characteristics of coal particles in oxygen-deficient atmosphere," Energy, Elsevier, vol. 170(C), pages 840-848.
    5. Li, Pin-Wei & Chyang, Chien-Song & Ni, Hung-Wen, 2018. "An experimental study of the effect of nitrogen origin on the formation and reduction of NOx in fluidized-bed combustion," Energy, Elsevier, vol. 154(C), pages 319-327.
    6. Vamvuka, Despina & Sfakiotakis, Stelios & Kotronakis, Manolis, 2012. "Fluidized bed combustion of residues from oranges’ plantations and processing," Renewable Energy, Elsevier, vol. 44(C), pages 231-237.
    7. Cao, Songshan & Duan, Feng & Zhang, Lihui & Chyang, ChienSong & Yang, ChihYun, 2017. "Application of response surface methodology to determine effects of operational conditions on in-bed combustion fraction in vortexing fluidized-bed combustor using different fuels," Energy, Elsevier, vol. 139(C), pages 862-870.
    8. Garcia, Eduardo & Liu, Hao, 2022. "Ilmenite as alternative bed material for the combustion of coal and biomass blends in a fluidised bed combustor to improve combustion performance and reduce agglomeration tendency," Energy, Elsevier, vol. 239(PA).
    9. Okasha, Farouk M., 2016. "Short overview on the jetting-fountain fluidized bed (JFFB) combustor," Renewable and Sustainable Energy Reviews, Elsevier, vol. 55(C), pages 674-686.
    10. Sher, Farooq & Pans, Miguel A. & Afilaka, Daniel T. & Sun, Chenggong & Liu, Hao, 2017. "Experimental investigation of woody and non-woody biomass combustion in a bubbling fluidised bed combustor focusing on gaseous emissions and temperature profiles," Energy, Elsevier, vol. 141(C), pages 2069-2080.
    11. Zhang, Li-hui & Chyang, Chien-Song & Duan, Feng & Li, Pin-Wei & Chen, Sing-Yu, 2016. "Comparison of the thermal behaviors and pollutant emissions of pelletized bamboo combustion in a fluidized bed combustor at different secondary gas injection modes," Energy, Elsevier, vol. 116(P1), pages 306-316.

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