Radial guide vane hydraulic design method of boiler feed pump for thermal power plant

Abstract

The invention relates to a guide vane hydraulic design method, in particular to a radial guide vane hydraulic design method of a boiler feed pump for a thermal power plant. The important radial guide vane design parameters such as the base circle diameter D3 of the guide vanes, the axial face width b3 of the throat portions of the guide vanes, the angle alpha 3 of inlets of the guide vanes, the number z of the guide vanes, the plane width a 3 of the throat portions of the guide vanes, the diameter D4 of outlets of the guide vanes, the length L of the diffusion segments of the guide vanes, the axial width a3 of the inlets of the guide vanes and the divergence angles phi of the guide vanes are determined through multiple formulas. By means of the radial guide vane hydraulic design method of the boiler feed pump for the thermal power plant, various factors affecting the use conditions of the feed pump in the working environment of the boiler feed pump for the thermal power plant are fully considered, the parameter design method is improved, and thus the reliability, stability, efficiency and service life of the boiler feed pump designed through the method are guaranteed.

Description

technical field [0001] The invention relates to a hydraulic design method of a guide vane, in particular to a hydraulic design method of a radial guide vane of a boiler feed water pump in a thermal power plant. Background technique [0002] The boiler feed water pump is an important part of the water supply system of a thermal power plant. Its water absorption is called a low-pressure water supply pipeline system, and its outlet side is called a high-pressure water supply pipeline system. The main function of the feed water pump is to supply water to the boiler continuously, reliably and stably. In order to make the high-pressure water supply pipeline system have a higher pressure, a high-speed pump can be used to feed water, but the feedwater pump is usually designed as a multi-stage centrifugal pump. [0003] Due to the high temperature of the feed water, the pressure at the inlet of the blades of the feed water pump is often very low. If the pressure is lower than the va...

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Problems solved by technology

[0003] Due to the high temperature of the feed water, the pressure at the inlet of the blades of the feed water pump is often very low. If the pressure is lower than the vaporization pressure of the feed water at this temperature, cavitation will occur, resulting in a decrease in the efficiency of the feed water pump, resulting in discontinuous water supply, and long-term cavitation. It will also cause damage to the blades and shorten the service life of the feed pump

In practice, the feed water pump will be placed under the deaerator to increase the static pressure at the inlet to avoid cavitation. However, due to high temperature, insufficient pressure, and water quality that cannot guarantee absolute purity, cavitation will still be inevitable. occur

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