Vacuum dehumidification membrane based device and method for recovering liquid state water from air

Abstract

The invention discloses vacuum dehumidification membrane based device and method for recovering liquid state water from the air. In the device, a certain differential pressure is formed on two sides of a separating membrane assembly by using a vacuum pump, thereby water vapor in the air on the high-pressure side of the separating membrane assembly passes through a membrane wall and is enriched onthe low-pressure side; and then the air with enriched water vapor is condensed in the evaporator for producing liquid state water or solid state water by using a steam compression type refrigeration system. Compared with an adsorption method, the invention has the advantages of continuous work process, no corrosion, easy maintenance and low energy consumption; in addition, the low-temperature airin which the water vapor is removed after flowing out of the evaporator is mixed with the air in the external environment to be used as a cooling medium of the condenser of the steam compression typerefrigeration system, thereby reducing the condensing temperature and the power consumption of a refrigeration compressor. Therefore, the invention has high comprehensive efficiency ratio and is suitable for people working in arid regions for a long term.

Description

technical field [0001] The invention belongs to the technical field of dehumidification and refrigeration, and relates to a water production method and a device thereof, in particular to a device and a method for recovering liquid water from air based on a vacuum dehumidification membrane. Background technique [0002] When people work in arid areas, especially in desert areas for a long time, fresh water supply is a prerequisite for all activities in such areas. Generally, the way to obtain water is mainly to rely on a small amount of rainfall accumulation or replenishment from the base, so the amount of water obtained Unstable or expensive. In fact, the air always contains a certain amount of water vapor. For example, the annual average relative humidity in the Sahara Desert is about 20-30%, and the humidity in the air at night is even greater. Water vapor converted into liquid water can be used by people who work in arid areas for a long time, especially suitable for fie...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a device and method for recovering liquid water from the air that can operate with lower energy consumption, which has the advantages of enriching water vapor similar to the adsorption method, thereby reducing the volume of refrigeration equipment and operating power consumption, and at the same time It can also overcome the shortcomings of large volume of adsorption equipment and high energy consumption in the desorption process, and use separation membranes to enrich water vapor

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