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Analysis and Evaluation of Multi-Energy Cascade Utilization System for Ultra-Supercritical Units

Author

Listed:
  • Shidan Chi

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

  • Tao Luan

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

  • Yan Liang

    (Shandong Electric Power Engineering Consulting Institute Corp., LTD, Jinan 250061, China)

  • Xundong Hu

    (Shandong Electric Power Engineering Consulting Institute Corp., LTD, Jinan 250061, China)

  • Yan Gao

    (School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China;)

Abstract

To address the large temperature difference in the air heater (AH) inlet of a traditional exhaust heat utilization system and energy grade mismatch problems during the heat and mass transfer processes, this study proposed a new multi-level waste heat cascade utilization system. Based on a principle of “temperature-to-port and cascade utilization”, this system uses the boiler side high-temperature flue gas and low-temperature air, and the turbine side high-temperature feed water and low-temperature condensate water, to conduct cross heat exchange according to the energy grade matching principle. Combined with a typical 1000 MW coal-fired unit, the heat transfer characteristics and energy-saving benefits of the new system were analyzed. The results showed that the new system has excellent performance: the heat rate decreased by 91 kJ/kWh, coal consumption decreased by 3.3 g/kWh, and power generation efficiency increased to 49.39%.

Suggested Citation

  • Shidan Chi & Tao Luan & Yan Liang & Xundong Hu & Yan Gao, 2020. "Analysis and Evaluation of Multi-Energy Cascade Utilization System for Ultra-Supercritical Units," Energies, MDPI, vol. 13(15), pages 1-13, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:15:p:3969-:d:393423
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    References listed on IDEAS

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