Optimization of Steam Distribution Mode for Turbine Units Based on Governing Valve Characteristic Modeling

Lei Zhang (), Zongliang Qiao, Bingsen Hei, Youfei Tang and Shasha Liu
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Lei Zhang: School of Intelligent Manufacturing, Nanjing Polytechnic Institute, Nanjing 210048, China
Zongliang Qiao: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
Bingsen Hei: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
Youfei Tang: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
Shasha Liu: School of Intelligent Manufacturing, Nanjing Polytechnic Institute, Nanjing 210048, China

Energies, 2022, vol. 15, issue 23, 1-15

Abstract: With the extensive application of renewable energy generation, thermal power units are required to participate in peak-regulating operations. The mode of steam distribution significantly influences the economy when the steam turbine operates at a low load. The turbine unit’s governing valve characteristics and steam distribution modes are studied in this paper, and the optimal sliding pressure operation curve is derived. Firstly, the theoretical model of the governing stage and the governing valve is derived, and the reliability is verified with field data. Secondly, the overall simulation model of the turbine unit is established, and the turbine off-design performance is analyzed with variable main steam pressure. Finally, the advantages and disadvantages of the three steam distribution modes are discussed thoroughly. The steam distribution modes and optimal main steam pressures are analyzed. The results show that a precise composite sliding pressure operation scheme is recommended, and a sliding pressure operation mode is adopted under 470 MW and constant pressure operation for others.

Keywords: turbine; governing valve; characteristic model; steam distribution mode; optimal steam pressure (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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