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Date of Publication:2022-10-07

Journal:Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University

Affiliation of Author(s):能源与动力学院

Volume:42

Issue:1

Page Number:119-125

ISSN No.:1006-7043

Abstract:To determine the exhaust pressure of a turbine with mixed working fluid (H2O+CO2) in a thermal power generation system based on coal supercritical water gasification technology, we first calculate the internal flow resistance of steam and mixed working fluid in a condenser. We then study the condensing process of the mixed working fluid. Finally, we discuss quantitatively the parameters influencing the optimum exhaust pressure, providing a reference for the determination of the exhaust pressure of a turbine with mixed working fluid. The results show that the flow resistance of mixed working fluid in the condenser is very small and that the condensing process requires constant pressure and cooling. The vacuum created in the condenser is not only related to the ambient temperature and terminal difference of the condenser, but also dependent on the steam condensation ratio. When the ambient temperature, terminal difference of the condenser, and condensation ratio are determined, the lowest working pressure in the condenser can be found. In the range of working conditions studied, when other parameters are constant, the steam condensation ratio increases by 3%, the optimum exhaust pressure increases by 180%, the net power of the system decreases by 56%, and the system efficiency decreases by 3.3 percentage points. When the ambient temperature increases by 10 ℃, the optimum exhaust pressure increases by 79.6%, net power increment decreases by 23%, and efficiency decreases by 2.8 percentage points. Copyright ©2021 Journal of Harbin Engineering University.

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