1000 MW ultra-supercritical turbine steam parameter optimization |
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Authors: | Weizhong Feng |
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Affiliation: | (1) Shanghai Waigaoqiao No. 3 Power Generation Co Ltd, Shanghai, 200137, China |
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Abstract: | The 2×1000 MW ultra-supercritical steam turbine of Shanghai Waigaoqiao Phase III project, which uses grid frequency regulation
and overload control through an overload valve, is manufactured by Shanghai Turbine Company using Siemens technology. Through
optimization, the steam pressure is regarded as the criterion between constant pressure and sliding pressure operation. At
high circulating water temperature, the turbine overload valve is kept closed when the unit load is lower than 1000 MW while
at other circulating water temperatures the turbine can run in sliding pressure operation when the unit load is higher than
1000 MW and the pressure is lower than 27 MPa This increases the unit operation efficiency. The 3D bending technology in the
critical piping helps to reduce the project investment and minimize the reheat system pressure drop which improves the unit
operation efficiency and safety. By choosing lower circulating water design temperature and by setting the individual Boiler
Feedwater Turbine condenser to reduce the exhaust steam flow and the heat load to the main condenser, the unit average back
pressure and the terminal temperature difference are minimized. Therefore, the unit heat efficiency is increased.
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Translated from Journal of Power Engineering, 2007, 27(3): 305–309, 331 译自 : 动力工程] |
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Keywords: | ultra-supercritical turbine the overload valve sliding pressure operation parameter optimization |
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