Constant-speed feed pump pressure regulating device and operation method

Abstract

The invention discloses a constant-speed water supply pump pressure regulating device and an operation method. The device comprises a water supply pipeline, a starting water supply pipeline and a deaerator, wherein the deaerator is arranged at the starting ends of the water supply pipeline and the starting water supply pipeline, high-pressure heaters III are arranged at the tail ends of the watersupply pipeline and the starting water supply pipeline, a first electric gate valve, a steam-driven water feeding pump booster pump, a steam-driven water feeding pump, a first pressure transmitter, afirst temperature transmitter and a second electric gate valve are sequentially arranged on the water supply pipeline in the medium flow direction, and a third electric gate valve, an electric constant-speed water feeding pump, a second pressure transmitter, a second temperature transmitter, a fourth electric gate valve and a first pneumatic control valve are sequentially arranged on the startingwater supply pipeline in the medium flow direction. According to the device, the problem that the lift of an electric constant-speed pump is too high can be solved, the pressure of the starting watersupply pipeline can be adjusted, the pressure of a main water supply pipeline can be adjusted, the steam-driven water supply pump can be smoothly connected to a grid, and normal operation of a power plant is not affected.

Description

technical field [0001] The invention belongs to the technical field of steam turbine generator unit operation, and in particular relates to a constant-speed feed water pump pressure regulating device and an operation method. Background technique [0002] When the pump is installed to work in a certain pipeline, the actual working state not only depends on the performance curve of the pump itself, but also depends on the characteristic curve of the entire pipeline. The intersection of these two curves determines the operating conditions of the pump in the piping system. In the device system with the same pipeline characteristic curve, the working point is different for different pumps. The working points of the fixed speed pump and the speed regulating pump are very different, so the flow, head and efficiency are different. [0003] The constant speed feed water pump is generally centrifugal in the water supply system, and its working principle is to use the centrifugal for...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the existing technical solutions, and provide a constant-speed feed water pump pressure regulating device and an operation method. A pressure regulating valve is installed behind the electric constant-speed pump to match the outlet pressure of the electric pump with the outlet pressure of the main pump. , can solve the problem of high head of the electric fixed-speed pump. This device can not only adjust the pressure of the start-up water supply pipeline, but also adjust the pressure of the main water supply pipeline, so that the steam-driven feedwater pump can be smoothly connected to the grid without affecting the power plant. normal operation

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