Operation method of double back-pressure double-rotor interchange type driving feed pump turbine

Abstract

The invention relates to an operation method of a double back-pressure double-rotor interchange type driving feed pump steam turbine. The operation method is implemented by adopting an operation system of the double back-pressure double-rotor interchange type driving feed pump steam turbine. The double back-pressure double-rotor interchange type driving feed pump turbine operation system comprisesan original feed pump turbine operation system and a high back-pressure feed pump turbine operation system which work in cooperation with each other; the original feed pump turbine operation system comprises an original feed pump turbine, a first low-pressure cylinder, a first condenser, a first heater, a first deaerator and a first steam-driven feed pump; the high back-pressure feed pump turbineoperation system comprises a high-back-pressure water feeding pump turbine, a second low-pressure cylinder, a second condenser, a second heater, a second deaerator and a second steam-driven feed pump; when a unit runs at high back pressure, a high back-pressure feed pump turbine running system is started; and when the unit operates at normal back pressure, the original feed pump turbine operationsystem before transformation is recovered to run.

Description

technical field [0001] The invention relates to the field of steam turbines, in particular to an operation method of a double back pressure double rotor interchangeable drive feed water pump steam turbine. Background technique [0002] The transformation of heat supply with double back pressure and double rotor interchange is to increase the heat supply capacity of the unit. The so-called double back pressure and double rotor interchange means that the unit uses high back pressure and low pressure rotors with a relatively reduced number of moving and stationary blades during the heating period, and uses circulating water for direct heating, and the condenser operates at a higher back pressure; Designed with low-pressure rotors to operate under normal back pressure. The 300MW unit is generally equipped with a driving feedwater pump steam turbine. Therefore, while the main engine is being transformed, the driving feedwater pump steam turbine also needs to be retrofitted with ...

AI Technical Summary

Problems solved by technology

At present, it is generally chosen to use a set of rotor transformation schemes for driving feedwater pump steam turbines, that is, only one rotor is used for driving feedwater pump steam turbines to adapt to the high and low back pressure operating conditions. Since the design of the flow part needs to adapt to the two working conditions, The efficiency of the steam turbine driving the feed water pump cannot be optimal, which affects the performance of the steam turbine driving the feed water pump and the heat supply capacity of the main engine

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