Seawater desalination device based on solution dehumidification

Abstract

The invention discloses a device based on solution dehumidification and desalination of seawater. The low-humidity air is obtained by absorbing the moisture of the air from the concentrated solution coming out of the solution regenerator, and then exchanges heat with the evaporator of the heat pump cycle to obtain low-temperature and low-moisture air. Humid air is used for evaporative freezing of seawater; the heat released from the condenser in the heat pump cycle is used for solution regeneration, and the cold energy in the evaporator is used to cool the low-humidity air used for evaporating seawater; the cooling The final seawater is sprayed in a low-temperature and low-humidity air environment to evaporate and freeze to precipitate ice crystals, forming ice crystal-salt water slurry, which is separated, washed, and melted to obtain fresh water. The present invention is based on the principle of seawater desalination by vacuum method, which utilizes the partial pressure difference of water vapor in the air to drive seawater evaporation and freezing. The desalination of seawater by vacuum method greatly reduces energy consumption.

Description

technical field [0001] The invention belongs to the field of seawater desalination, and relates to a seawater desalination device based on solution dehumidification. Background technique [0002] In recent years, with the rapid development of social economy, the water ecological environment has deteriorated seriously, and the contradiction between supply and demand of water resources in my country has further intensified. my country has abundant marine resources, and further promoting the development of seawater desalination industry is an effective means to solve the shortage of water resources in our country. [0003] The freezing method of seawater desalination is a research hotspot in the industry. The freezing method uses the heat of melting of water to be 1 / 7 of the heat of vaporization of water. Compared with the distillation method, the freezing method greatly saves energy, but the process of freezing seawater desalination The ice cubes produced in the water are rel...

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Problems solved by technology

[0003] The freezing method of seawater desalination is a research hotspot in the industry. The freezing method uses the heat of melting of water to be 1 / 7 of the heat of vaporization of water. Compared with the distillation method, the freezing method greatly saves energy, but the process of freezing seawater desalination The ice cubes produced in the water are relatively large, and there are inevitably salt cells in the ice cubes, and the taste of the fresh water produced is not good.

Vacuum freezing seawater desalination is based on the principle of triple point of water. Near the triple point of water, three phases of vapor, liquid and solid coexist. If the seawater is controlled near the triple point, the evaporation and freezing of seawater will proceed simultaneously. The vacuum freezing method uses this principle to atomize and spray seawater in the vacuum evaporation chamber. The seawater droplets form ice crystals, which are washed, separated and melted to produce fresh water. However, creating a vacuum environment requires a lot of energy, which runs counter to the original intention of saving energy.

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