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Article

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

by 1, 1,*, 2, 2 and 3,*
1
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
2
Shandong Electric Power Engineering Consulting Institute Corp., LTD, Jinan 250061, China
3
School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China;
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(15), 3969; https://doi.org/10.3390/en13153969
Received: 26 June 2020 / Revised: 27 July 2020 / Accepted: 28 July 2020 / Published: 2 August 2020
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%. View Full-Text
Keywords: gradient utilization; waste heat utilization; energy saving gradient utilization; waste heat utilization; energy saving
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MDPI and ACS Style

Chi, S.; Luan, T.; Liang, Y.; Hu, X.; Gao, Y. Analysis and Evaluation of Multi-Energy Cascade Utilization System for Ultra-Supercritical Units. Energies 2020, 13, 3969. https://doi.org/10.3390/en13153969

AMA Style

Chi S, Luan T, Liang Y, Hu X, Gao Y. Analysis and Evaluation of Multi-Energy Cascade Utilization System for Ultra-Supercritical Units. Energies. 2020; 13(15):3969. https://doi.org/10.3390/en13153969

Chicago/Turabian Style

Chi, Shidan, Tao Luan, Yan Liang, Xundong Hu, and Yan Gao. 2020. "Analysis and Evaluation of Multi-Energy Cascade Utilization System for Ultra-Supercritical Units" Energies 13, no. 15: 3969. https://doi.org/10.3390/en13153969

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