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Thermodynamic assessment and optimization of a pressurized fluidized bed oxy-fuel combustion power plant with CO2 capture

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  • Chen, Shiyi
  • Yu, Ran
  • Soomro, Ahsanullah
  • Xiang, Wenguo

Abstract

In this paper, a 600 MW pressurized fluidized bed oxy-fuel combustion power plant integrated with an air separation unit (ASU) and a CO2 compression and purification unit (CPU) was presented. Pressurization increases the flue gas dew point, and more phase-change heat of moisture is thereby available in the flue gas. In the baseline case of 10 bar, the net power efficiency of the plant was 33.40%. The effect of pressure on the plant performance was important whereas the effect of fluidized bed temperature was marginal. The plant with wet mode flue gas recirculation offered higher net power efficiency than the dry mode. Heat integration of ASU, CPU and acid condenser with the steam cycle was conducted to maximize the power production. The use of heat from the acid condenser increased the net power efficiency by 0.81% point over the baseline case. The heat recovery from ASU boosted the net power efficiency by 2.22% points, while the heat recovery from CPU resulted in the net power efficiency improvement of 0.34% point. In the optimization combining ASU, CPU and acid condenser, the net power efficiency increased to 36.83% (LHV), which was competitive over other oxy-fuel combustion counterparts.

Suggested Citation

  • Chen, Shiyi & Yu, Ran & Soomro, Ahsanullah & Xiang, Wenguo, 2019. "Thermodynamic assessment and optimization of a pressurized fluidized bed oxy-fuel combustion power plant with CO2 capture," Energy, Elsevier, vol. 175(C), pages 445-455.
    • Handle: RePEc:eee:energy:v:175:y:2019:i:c:p:445-455
    DOI: 10.1016/j.energy.2019.03.090
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    5. Zheng, Yawen & Gao, Lin & He, Song, 2023. "Analysis of the mechanism of energy consumption for CO2 capture in a power system," Energy, Elsevier, vol. 262(PA).
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    7. Kim, Taewoo & Park, So Dam & Lee, Uen Do & Park, Byeong Cheol & Park, Kyoung Il & Hong, Jongsup, 2021. "Thermodynamic analysis of the 2nd generation pressurized fluidized-bed combustion cycle utilizing an oxy-coal boiler and a gasifier," Energy, Elsevier, vol. 236(C).
    8. García-Luna, S. & Ortiz, C. & Carro, A. & Chacartegui, R. & Pérez-Maqueda, L.A., 2022. "Oxygen production routes assessment for oxy-fuel combustion," Energy, Elsevier, vol. 254(PB).
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    10. Zhang, Wenda & Sun, Shaozeng & Zhao, Yijun & Zhao, Zujie & Wang, Pengxiang & Feng, Dongdong & Li, Pengfei, 2020. "Effects of total pressure and CO2 partial pressure on the physicochemical properties and reactivity of pressurized coal char produced at rapid heating rate," Energy, Elsevier, vol. 208(C).
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    12. Kim, Hyung Woo & Seo, Su Been & Kang, Seo Yeong & Go, Eun Sol & Oh, Seung Seok & Lee, YongWoon & Yang, Won & Lee, See Hoon, 2021. "Effect of flue gas recirculation on efficiency of an indirect supercritical CO2 oxy-fuel circulating fluidized bed power plant," Energy, Elsevier, vol. 227(C).
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