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Energy and Economic Assessment of Oxy-Fuel Combustion CO 2 Capture in Coal-Fired Power Plants

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  • Yuyang Yuan

    (School of Environmental Science and Engineering, Nanjing Tech University, 30 Puzhu South Road, Nanjing 211816, China)

  • Lei Wang

    (School of Environmental Science and Engineering, Nanjing Tech University, 30 Puzhu South Road, Nanjing 211816, China)

  • Yaming Zhuang

    (School of Mechanical and Electrical Engineering, Suqian University, 399 Huanghe Road, Suqian 223800, China)

  • Ying Wu

    (School of Environmental Science and Engineering, Nanjing Tech University, 30 Puzhu South Road, Nanjing 211816, China
    Faculty of Automation, Huaiyin Institute of Technology, Huai’an 223003, China)

  • Xiaotao Bi

    (Chemical and Biological Engineering Department, University of British Columbia, Vancouver, BC V6T 1Z3, Canada)

Abstract

Oxy-fuel combustion technology replaces air with a mixture of pure O 2 and recycled flue gas for coal combustion, which leads to difficulties in the waste heat recovery of flue gas in the boiler tail of coal-fired power plants. This paper proposes a new integration scheme for waste heat recovery of flue gas in coal-fired power plants with oxy-fuel combustion CO 2 capture. By introducing an oxygen preheater, a recycled flue gas preheater, and a low-pressure economizer, the waste heat of flue gas is fully recovered to preheat oxygen, recycled flue gas, and feed water, respectively. The proposed scheme simultaneously ensures the safe operation of the recycled fan and improves the thermal performance of the coal-fired power plants. Compared to the air combustion configuration, the boiler’s efficiency and gross power efficiency in the oxy-fuel combustion configuration are increased by 0.42% and 1.29%, respectively. Due to power consumption for the added equipment, the net power efficiency is reduced by 10.41%. A techno-economic analysis shows that the cost of electricity for oxy-fuel combustion in coal-fired power plants has increased from USD 46.45/MWh to USD 80.18/MWh, and the cost of the CO 2 avoided reaches USD 43.24/t CO 2 .

Suggested Citation

  • Yuyang Yuan & Lei Wang & Yaming Zhuang & Ying Wu & Xiaotao Bi, 2024. "Energy and Economic Assessment of Oxy-Fuel Combustion CO 2 Capture in Coal-Fired Power Plants," Energies, MDPI, vol. 17(18), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:18:p:4626-:d:1478747
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    References listed on IDEAS

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