Frequency conversion control method of circulating water pumps of two steam turbine generator sets

Abstract

The invention provides a frequency conversion control method of circulating water pumps of two steam turbine generator sets. The frequency conversion control method includes that variable frequency pumps are introduced into the frequency conversion control method, and an original mode of 'two steam turbine generator sets with four power frequency pumps' is changed into a mode of 'two steam turbine generator sets with two variable frequency pumps and two power frequency pumps'; and the power frequency pumps are automatically started or closed and the frequencies of the variable frequency pumps are regulated according to load demands of the steam turbine generator sets, so that vacuum degree of condensers of the steam turbine generator sets is stable, and automatic control of variable frequency of the steam turbine generator sets is realized. A variable frequency speed adjustment technology is a modern advanced speed adjustment technology which can not only provide stable and high efficient speed adjustment quality to meet usage requirements of users, but also save a large quantity of energy when the variable frequency speed adjustment technology is applied to loads, such as fans, pumps and the like which have square torque characteristics, and maximum energy-saving rate can reach 30%-70%.

Description

technical field [0001] The invention relates to a frequency conversion control method, in particular to a frequency conversion control method for a circulating water pump of a double steam turbine unit. Background technique [0002] At present, the steam turbine units of most power generation enterprises still use power frequency circulating water pumps, and the outlet door adopts butterfly valves, which only have two positions: fully open and fully closed. The adjustment of circulating water volume is controlled by the number of switching circulating water pumps. Due to the difference in temperature, it often occurs that the flow rate of one circulating water pump is not enough, and the flow rate of two circulating water pumps is too large. Due to this adjustment method, the vacuum degree of the condenser of the steam turbine unit is unstable, and it cannot be guaranteed to operate in an economical operation mode, resulting in high power generation costs. Contents of the ...

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Problems solved by technology

[0002] At present, the steam turbine units of most power generation enterprises still use power frequency circulating water pumps, and the outlet door adopts butterfly valves, which only have two positions: fully open and fully closed. The adjustment of circulating water volume is controlled by the number of switching circulating water pumps. Due to the difference in temperature, it often happens that the flow rate of one circulating water pump is not enough, and the flow rate of two circulating water pumps is too large

Due to this adjustment method, the vacuum degree of the condenser of the steam turbine unit is unstable, and it cannot be guaranteed to operate in an economical operation mode, resulting in high power generation costs

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