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Design of large scale oxy-fuel fluidized bed boilers: Constant thermal power and constant furnace size scenarios

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  • Seddighi, Sadegh

Abstract

This work investigates the design of large scale oxy-fuel circulating fluidized bed (CFB) boilers in two industrial pathways of constant thermal power scenario and constant furnace size scenario using a new version of a model validated with 100 kWth and 4 MWth oxy-fuel CFB boilers. This work suggests that the major approach for elevating the circulating solids flux is to utilize more efficient cyclones with better efficiency which leads to higher share of fines and nanoparticles in the CFB loop while the amount of aerosols is reduced. Maximum heat flux from furnace walls is 2.4 times and CO peak is 2.2 times in constant furnace size scenario compared to constant thermal power scenario respectively, showing more intense combustion in the prior scenario. Based on the results found in this work, if the industry is to aim to operate the large-scale oxy-fuel CFB boilers at high O2 concentrations, the utilization of the constant thermal power scenario is much safer for the industry compared to constant furnace size scenario. This work shows that the aspect ratio of future large-scale oxy-fuel CFB furnaces are larger than the current air-fired ones leading the oxy-CFB furnace geometry to approach the fluid catalytic cracking fluidized beds.

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  • Seddighi, Sadegh, 2017. "Design of large scale oxy-fuel fluidized bed boilers: Constant thermal power and constant furnace size scenarios," Energy, Elsevier, vol. 118(C), pages 1286-1294.
    • Handle: RePEc:eee:energy:v:118:y:2017:i:c:p:1286-1294
    DOI: 10.1016/j.energy.2016.11.004
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    Cited by:

    1. Adamczyk, Wojciech P. & Myöhänen, Kari & Hartge, Ernst-Ulrich & Ritvanen, Jouni & Klimanek, Adam & Hyppänen, Timo & Białecki, Ryszard A., 2018. "Generation of data sets for semi-empirical models of circulated fluidized bed boilers using hybrid Euler-Lagrange technique," Energy, Elsevier, vol. 143(C), pages 219-240.
    2. Seddighi, Sadegh & Clough, Peter T. & Anthony, Edward J. & Hughes, Robin W. & Lu, Ping, 2018. "Scale-up challenges and opportunities for carbon capture by oxy-fuel circulating fluidized beds," Applied Energy, Elsevier, vol. 232(C), pages 527-542.
    3. Abdolahi-Mansoorkhani, Hamed & Seddighi, Sadegh, 2019. "H2S and CO2 capture from gaseous fuels using nanoparticle membrane," Energy, Elsevier, vol. 168(C), pages 847-857.
    4. Mohammadpour, Mohammadreza & Ashjaee, Mehdi & Houshfar, Ehsan, 2022. "Thermal performance and heat transfer characteristics analyses of oxy-biogas combustion in a swirl stabilized boiler under various oxidizing environments," Energy, Elsevier, vol. 261(PA).
    5. Moon, Ji-Hong & Jo, Sung-Ho & Park, Sung Jin & Khoi, Nguyen Hoang & Seo, Myung Won & Ra, Ho Won & Yoon, Sang-Jun & Yoon, Sung-Min & Lee, Jae-Goo & Mun, Tae-Young, 2019. "Carbon dioxide purity and combustion characteristics of oxy firing compared to air firing in a pilot-scale circulating fluidized bed," Energy, Elsevier, vol. 166(C), pages 183-192.
    6. Bashtani, Javad & Seddighi, Sadegh & Bahrabadi-Jovein, Iman, 2018. "Control of nitrogen oxide formation in power generation using modified reaction kinetics and mixing," Energy, Elsevier, vol. 145(C), pages 567-581.

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