Real-time calculation method of optimal vacuum of steam turbine

Abstract

The present invention discloses a real-time optimized calculation method of the optimal vacuum of a steam turbine cold-end system, and belongs to the field of operation optimization of a thermal power unit. The optimized calculation method comprises the calculation of the final steam discharge enthalpy of the steam turbine, the calculation of the final displacement of the steam turbine, the calculation of the variable working condition of the condenser and the calculation of the variable working condition of the variable frequency circulating water pump. The heat transfer coefficient of the condenser under the operation condition of the current unit is obtained through calculation, according to the adjustable range of the variable frequency circulating water pump of the unit, the final steam discharge enthalpy of the steam turbine, the final displacement of the steam turbine, the power increment of the steam turbine, and the power consumption increment of the circulating water pump under different circulating water flows are calculated, and the optimal operation vacuum of the unit and the optimal operation frequency of the circulating water pump within the adjustable range of the variable frequency circulating water pump are obtained by taking the maximized unit profit as the objective function, so that guidance is provided for the unit optimized operation, and overall economic efficiency of the unit is improved.

Description

technical field [0001] The invention belongs to the technical field of parameter optimization of the cold end system of a thermal power unit, and in particular relates to a real-time calculation method for optimal vacuum of a steam turbine. Background technique [0002] The cold end system of the steam turbine is an important auxiliary system of the thermal power unit, and its operation status is directly related to the safe and economical operation of the unit. [0003] In the existing thermal power unit operation mode, offline calculation results are generally used in the vacuum optimization of the cold end system of the steam turbine. According to the heat transfer coefficient of the condenser and the correction curve of the steam turbine back pressure under the set working The parameters under the given working conditions and the given ambient temperature are calculated. Since the characteristics of the unit will change during the operation process, the vacuum optimizat...

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Problems solved by technology

Since the characteristics of the unit will change during the operation process, the vacuum optimization calculation based on the set working condition data is separated from the characteristics of the actual operating unit, and because the ambient temperature and unit load are constantly changing, it is difficult to guarantee the accuracy of the previous off-line calculation method, so The patent of this invention provides a real-time calculation method for the optimal vacuum of a steam turbine, which combines the current operating condition data and environmental parameters of the unit to perform variable working condition calculations, which has more practical guiding significance

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