A vacuum vapor compression distillation sea water desalination device

Abstract

The present invention relates to a vacuum vapor compression distillation sea water desalination device comprising: a sea water pump, a seal chamber, a vacuum evaporation chamber and a vacuum pump and other components. In operation, a drive shaft drives the vacuum evaporation chamber filled with fresh water to rotate, after the formation of a vacuum area without water, sea water is fed in, and at the same time working vapor is fed in a vapor pipe coil, heat transfer between the vapor in the vapor pipe coil and the outside sea water enable the condensation of the vapor to obtain fresh water, while the sea water volatilizes to form primary vapor; and after temperature and pressure rise via a impeller, the primary vapor is fed in the vapor pipe coil as the working vapor for continuous vapor compression distillation to achieve sea water desalination. According to the device of the invention, centrifugal force is employed to replace the gravity to obtain a vacuum environment, operations are all in room temperature, no external heat source is required, and circular energy supply is achieved by the utilization of latent heat of the vapor; the water production rate and the energy utilization rate of the system are high; and the device has advantages of a simple process, a compact structure, little corrosion and scaling, etc.

Description

technical field [0001] The invention relates to the fields of seawater, brackish water desalination and sewage purification, in particular, the invention relates to a vacuum pressure steam distillation seawater desalination device. Background technique [0002] Seawater desalination by thermal method under vacuum or low pressure environment has the advantages of simple seawater pretreatment method, light corrosion and scaling of equipment, high quality of fresh water, and is conducive to the application of low-grade energy such as solar energy, but its main disadvantage is to maintain the vacuum in the evaporator It requires a large amount of electric energy, and the water supply and the discharge of concentrated seawater after evaporation also require a large amount of pump power, so the project cost is relatively high. For example, Chinese patents CN2344390Y, CN1473765A, and CN200978230Y all use vacuum pumps to obtain the vacuum environment required for low-temperature des...

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Problems solved by technology

However, this method uses natural gravity to obtain a vacuum, and the equipment is high in height, bulky, and requires a lot of space.

[0004] Chinese patent CN202880936U uses the overweight position generated by rotation to realize the vacuum environment required for vacuum seawater desalination. It has the advantages of compact structure and is conducive to the drive of renewable mechanical energy. However, the condensation of steam is realized by using its natural flow and contact with fresh water. The temperature difference of fresh water is small, and the mass transfer and heat transfer between the two are slow, so the condensation rate is low, which will eventually lead to low fresh water production rate and waste of steam and energy

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