A multi-stage seawater desalination system based on changing the humidity of the carrier gas

Abstract

The invention discloses a multistage seawater desalination system based on change of carrying gas humidity. The multistage seawater desalination system comprises a cycle heating system, a humidification dehumidifying system and a gas-liquid separation system; the cycle heating system comprises a heat energy generation apparatus, a pump 1 and a heat exchanger which are connected in order; the humidification dehumidifying system comprises a humidification chamber, a dehumidifying chamber and a ventilation liquid-collection device used for separating the humidification chamber and the dehumidifying chamber, a fresh water collection groove is arranged at the bottom of the dehumidifying chamber, the gas-liquid separation system comprises a gas-liquid cooling cyclone separator, a pump 3 and a blower fan, an inlet and a gas outlet are arranged at the upper part of the gas-liquid cooling cyclone separator, a fresh water outlet is arranged at the bottom, the dehumidifying chamber and the inletof the gas-liquid cooling cyclone separator are connected, the gas outlet is connected with the blower fan and the humidification chamber in order, and the fresh water separated from the gas-liquid cooling cyclone separator is discharged and is pumped to the dehumidifying chamber by the pump 3. The multistage seawater desalination system fully uses condensation latent heat, has the advantages of low energy consumption and high seawater desalination rate, and is especially suitable for island and brackish water regions with relatively dispersed fresh water requirement.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, in particular to a multistage seawater desalination system based on changing the humidity of carrier gas. Background technique [0002] Multi-stage flash evaporation, low-temperature multi-effect distillation, and reverse osmosis are the three mainstream technologies for seawater desalination today. However, these three methods require large equipment investment, high cost, high energy consumption, and high requirements for seawater pretreatment. They are only suitable for large-scale production of fresh water, and are not suitable for solving a small amount of fresh water demand, such as island areas and remote interiors. The fresh water needs of land areas, tourist attractions, etc. Moreover, these three methods consume insufficient electric energy or petrochemical energy, and the discharge of a large amount of greenhouse gases and concentrated seawater after desalination has ver...

AI Technical Summary

Problems solved by technology

In the current humidification and dehumidification seawater desalination technology, the humidification tower and the dehumidification tower are generally installed separately, which occupies a large space, and the carrier gas after dehumidification generally carries more water vapor, resulting in a low water production rate and dehumidification. Higher carrier gas pressure after wet, resulting in lower water carrying capacity of the carrier gas during recirculation

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