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Combustion Characteristics of 0.5 MW Class Oxy-Fuel FGR (Flue Gas Recirculation) Boiler for CO 2 Capture

Author

Listed:
  • Joon Ahn

    (School of Mechanical Engineering, Kookmin University, Seoul 02707, Korea)

  • Hyouck-Ju Kim

    (Korea Institute of Energy Research, Daejeon 34129, Korea)

Abstract

A 0.5 MW class oxy-fuel boiler was developed to capture CO 2 from exhaust gas. We adopted natural gas as the fuel for industrial boilers and identified characteristics different from those of pulverized coal, which has been studied for power plants. We also examined oxy-fuel combustion without flue gas recirculation (FGR), which is not commonly adopted in power plant boilers. Oxy-fuel combustion involves a stretched flame that uniformly heats the combustion chamber. In oxy-natural-gas FGR combustion, water vapor was included in the recirculated gas and the flame was stabilized when the oxygen concentration of the oxidizer was 32% or more. While flame delay was observed at a partial load for oxy-natural-gas FGR combustion, it was not observed for other combustion modes. In oxy-fuel combustion, the flow rate and flame fullness decrease but, except for the upstream region, the temperature near the wall is distributed not lower than that for air combustion because of the effect of gas radiation. For this combustion, while the heat flux is lower than other modes in the upstream region, it is more than 60% larger in the downstream region. When oxy-fuel and FGR combustion were employed in industrial boilers, more than 90% of CO 2 was obtained, enabling capture, sequestration, and boiler performance while satisfying exhaust gas regulations.

Suggested Citation

  • Joon Ahn & Hyouck-Ju Kim, 2021. "Combustion Characteristics of 0.5 MW Class Oxy-Fuel FGR (Flue Gas Recirculation) Boiler for CO 2 Capture," Energies, MDPI, vol. 14(14), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:14:p:4333-:d:596627
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    References listed on IDEAS

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    1. Oh, Jeongseog & Noh, Dongsoon, 2015. "Flame characteristics of a non-premixed oxy-fuel jet in a lab-scale furnace," Energy, Elsevier, vol. 81(C), pages 328-343.
    2. Gaber, Christian & Schluckner, Christoph & Wachter, Philipp & Demuth, Martin & Hochenauer, Christoph, 2021. "Experimental study on the influence of the nitrogen concentration in the oxidizer on NOx and CO emissions during the oxy-fuel combustion of natural gas," Energy, Elsevier, vol. 214(C).
    3. Zong Woo Geem & Jin-Hong Kim, 2016. "Optimal Energy Mix with Renewable Portfolio Standards in Korea," Sustainability, MDPI, vol. 8(5), pages 1-14, May.
    4. Park, Nyun-Bae & Park, Sang Yong & Kim, Jong-Jin & Choi, Dong Gu & Yun, Bo Yeong & Hong, Jong Chul, 2017. "Technical and economic potential of highly efficient boiler technologies in the Korean industrial sector," Energy, Elsevier, vol. 121(C), pages 884-891.
    5. Wu, Hai-bo & Xu, Ming-xin & Li, Yan-bing & Wu, Jin-hua & Shen, Jian-chong & Liao, Haiyan, 2020. "Experimental research on the process of compression and purification of CO2 in oxy-fuel combustion," Applied Energy, Elsevier, vol. 259(C).
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    Cited by:

    1. Zixue Luo & Zixuan Feng & Bo Wu & Qiang Cheng, 2022. "Decoupling Investigation of Furnace Side and Evaporation System in a Pulverized-Coal Oxy-Fuel Combustion Boiler," Energies, MDPI, vol. 15(7), pages 1-12, March.

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