Hydraulic design method for sea water desalination high-pressure booster pump

Abstract

The invention belongs to the field of fluid machinery, and particularly discloses a hydraulic design method for a sea water desalination high-pressure booster pump. An impeller is of a symmetrical double-suction structure. The problem that the axial force of the sea water desalination high-pressure booster pump is too large is mainly solved; in addition, the design scheme without overload is adopted, and on the basis of a velocity coefficient method, the sea water desalination high-pressure booster pump capable of reducing the axial force greatly is designed. The main design parameters comprises 1, the impeller inlet diameter D1; 2, the impeller hub diameter dh; 3, the blade inlet setting angle beta 1; 4, the blade outlet setting angle beta 2; 5, the impeller outlet diameter D2; 6, the impeller outlet width b2; 7, the blade number z; 8, the blade wrap angle phi and the like. The problems that safe operation of the sea water desalination high-pressure booster pump is seriously influenced due to the fact that working and the produced large axial force of high-speed rotating twisted blades at an inlet of the sea water desalination high-pressure booster pump have destructive effects on all the pump shell strength, a mechanical seal and a bearing system of the high-pressure booster pump can be solve effectively.

Description

technical field [0001] The invention belongs to the field of fluid machinery, and in particular relates to a hydraulic design method of a high-pressure booster pump for seawater desalination, which mainly solves the problem of excessive axial force of the high-pressure booster pump under normal operating conditions. Background technique [0002] The membrane seawater desalination method is one of the most important seawater desalination methods at present. It has the characteristics of low energy consumption, simple equipment, high efficiency, and short construction period. It consumes less energy because the rice osmotic seawater desalination system has an important energy recovery device. Due to the loss in the energy exchange process, the pressure of the source seawater pressurized by the energy recovery device is lower than the osmotic pressure, and the seawater desalination high-pressure booster pump The role of the pump is to supplement the pressure loss of the recover...

AI Technical Summary

Problems solved by technology

The booster pump has the characteristics of seawater corrosion resistance and high inlet pressure. The high inlet pressure requires that the design of the booster pump product needs to fully consider the structural strength and reliability of the pump casing, and the high pressure caused by the twisted blades rotating at high speed at the inlet of the high-pressure booster pump. The dynamic pressure produces a large axial force, which has a great destructive effect on the strength of the pump casing, mechanical seal and bearing system of the high-pressure booster pump, and seriously affects the safe operation of the high-pressure booster pump for seawater desalination.

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