Research on Coupling Heating under Varying Duty Based on the In-Depth Cascade Utilization of Heat Energy

doi:10.11930/j.issn.1004-9649.202206003

Abstract

Abstract: In order to achieve the goal of energy-saving and carbon reduction for coal-fired units, a coupled heating system based on deep cascade utilization of thermal energy is proposed in this paper. The model is first established for the assessment of power supply and heating energy consumption of cogeneration unit by applying thermal analysis method. Then on the basis of the calculation of energy consumption of the coupled heating system using thermal power integration scheme Software (TPIS), the operating energy consumption of the coupled heating system under varying duty is studied. The results show that the temperature of water supply can be adjusted ranging from 44℃ to 90℃ by virtue of different coupled heating methods under variable parameter operation conditions. The thermal index varies in a different way as the unit load goes up or down. Regardless of different coupled heating methods implemented, the thermal efficiencies all decrease with the load increase at unit one, while they all increase with the load increase at unit three, and the unit thermal efficiencies vary from 63% to 80%. The study results are technically supportive of the variable operation optimization of cogeneration units, energy saving and carbon reduction.

Key words: heat and power cogeneration, coupling heating, high back pressure, back pressure steam turbine, varying duty

QIAO Jiafei, LIANG Zhanwei, ZHANG Lei, WANG Shunsen. Research on Coupling Heating under Varying Duty Based on the In-Depth Cascade Utilization of Heat Energy[J]. Electric Power, 2022, 55(9): 204-212.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202206003

https://www.electricpower.com.cn/EN/Y2022/V55/I9/204

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