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Energy and Exergy Analysis on a Blast Furnace Gas-Driven Cascade Power Cycle

Author

Listed:
  • Hao Chen

    (Institute of Combustion and Thermal System, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Yiming Wang

    (Institute of Combustion and Thermal System, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Linbo Yan

    (Institute of Combustion and Thermal System, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Ziliang Wang

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

  • Boshu He

    (Institute of Combustion and Thermal System, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Baizeng Fang

    (Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada)

Abstract

Blast furnace gas is the major combustible by-product produced in the steel industry, where iron ore is reduced by coke into iron. Direct combustion of blast furnace gas after simple treatment for power generation is a common utilization method nowadays. However, this method suffers from low efficiency and high carbon intensity. The use of gas-steam combined cycle is an excellent method to improve the efficiency of blast furnace gas for power generation. However, there is a problem of insufficient utilization of low product heat, and the addition of CCS system can further reduce the power efficiency. To solve these issues, a new blast furnace gas power generation system with a Brayton cycle with supercritical CO 2 and a Rankine cycle with transcritical CO 2 is proposed in this work. The new system is then thermodynamically simulated by Aspen Plus, after the sub-modules are validated. The effects of molar ratio of steam to carbon, selexol/CO 2 mass ratio, compression ratio, turbine import temperature and turbine inlet pressure on the system are investigated. A comparison is also performed between the new combined cycle system and the traditional combined cycle power generation system. The results show that in the new power generation system, net power efficiency of 53.29%, carbon capture efficiency of 95.78% and sulfur capture rate of 94.46% can be achieved, which is significantly better than the performance of the conventional combined cycle.

Suggested Citation

  • Hao Chen & Yiming Wang & Linbo Yan & Ziliang Wang & Boshu He & Baizeng Fang, 2022. "Energy and Exergy Analysis on a Blast Furnace Gas-Driven Cascade Power Cycle," Energies, MDPI, vol. 15(21), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:8078-:d:958688
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    References listed on IDEAS

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    1. Lee, Woo-Sung & Lee, Jae-Cheol & Oh, Hyun-Taek & Baek, Seung-Won & Oh, Min & Lee, Chang-Ha, 2017. "Performance, economic and exergy analyses of carbon capture processes for a 300 MW class integrated gasification combined cycle power plant," Energy, Elsevier, vol. 134(C), pages 731-742.
    2. Pala, Laxmi Prasad Rao & Wang, Qi & Kolb, Gunther & Hessel, Volker, 2017. "Steam gasification of biomass with subsequent syngas adjustment using shift reaction for syngas production: An Aspen Plus model," Renewable Energy, Elsevier, vol. 101(C), pages 484-492.
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