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Thermodynamic, Economic and Environmental Evaluation of an Improved Ventilation Air Methane-Based Hot Air Power Cycle Integrated with a De-Carbonization Oxy-Coal Combustion Power Plant

Author

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  • Cheng Xu

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

  • Yachi Gao

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

  • Qiang Zhang

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

  • Guoqiang Zhang

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

  • Gang Xu

    (National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China)

Abstract

Efficient utilization of ventilation air methane (VAM) as well as improving the energy efficiency of de-carbonization oxy-coal combustion power plants are intensively studied for achieving energy savings and greenhouse gas (GHG) emission control. Here, an improved VAM-coal hybrid power generation system, which integrates a VAM-based hot air power cycle with a de-carbonization oxy-coal combustion circulating fluid bed (CFB) power plant was proposed. In the proposed system, part of the boiler flue gas was bypassed to feed the VAM auto-oxidation, and the whole VAM oxidation heat was efficiently utilized to drive a hot air power cycle. Meanwhile, the turbine exhaust air was utilized to heat the feed/condensed water within the regenerative heating trains in a cascade way, which was in turn beneficial to de-carbonization oxy-coal combustion plant. The mass and energy balance of the proposed system were determined using the simulation process. The thermodynamic benefits, economic viability and the environmental impacts were discussed. Results showed that energy efficiency of the proposed system reached 27.1% with the energy saving ratio at 0.9%. The cost of electricity (COE) was $118.15/MWh with the specific CO 2 emission as low as 17.46 kg CO 2 /MWh.

Suggested Citation

  • Cheng Xu & Yachi Gao & Qiang Zhang & Guoqiang Zhang & Gang Xu, 2018. "Thermodynamic, Economic and Environmental Evaluation of an Improved Ventilation Air Methane-Based Hot Air Power Cycle Integrated with a De-Carbonization Oxy-Coal Combustion Power Plant," Energies, MDPI, vol. 11(6), pages 1-17, June.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1434-:d:150437
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    References listed on IDEAS

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