A humidifying-dehumidifying seawater or brackish water desalination device and method

Abstract

The present invention belongs to a humidification-dehumidification desalination method and apparatus for sea water or brackish water, and the apparatus includes pretreatment system and a humidification-dehumidification system. The pretreated seawater or brackish water is introduced into a storage tank, preheated by a heater, pumped into a humidification tower; and then the seawater or brackish water passes through an overhead liquid distributor and directly contacts with the bottom-up carrier gas flowing through a packed column, so as to humidify the carrier gas; and the carrier gas with high humidity is introduced to dehumidification tower bottom via a pipeline, and direct contacts with the top-down cooling water, and the water vapor is condensed and discharged with cooling water, so as to obtain fresh water. The method uses the characteristics of large specific surface area and small resistance of the filler, realizes gas-liquid interphase faster heat and mass transfer, and is applicable to sea island, desert and thermal power plants. Compared with the prior desalination technology, the apparatus has the characteristics of simple equipment, easy operation, easy treatment and cleaning, small investment, and easy operation and maintenance.

Description

technical field [0001] The invention belongs to the field of seawater desalination, and in particular relates to a device and method for desalinating seawater or brackish water by humidifying and dehumidifying. Background technique [0002] Water is called the source of human life, plays an important role in human survival and development, and is an indispensable and important natural resource for human beings. With the large-scale development of human beings and the destruction of the environment, the shortage of fresh water resources has become more severe, and the desalination technology of seawater or brackish water provides an effective means to solve the problem of shortage of fresh water resources. [0003] At present, traditional seawater desalination methods can be roughly divided into two categories: phase change method and non-phase change method. Phase change methods mainly include distillation, freezing and gas hydrate methods, while non-phase change methods in...

AI Technical Summary

Problems solved by technology

Although the spray method overcomes the shortcomings of the large resistance of the bubbling method, it cannot balance the advantages and disadvantages in controlling the spray particle size.

If the mist droplets are too large, the air-water contact will be insufficient, and the humidification effect will be poor; if the mist droplets are too small, the mist droplets may be directly carried by the air into the condenser, affecting the water quality

Images