Low-temperature low-pressure solar local-thermal-process seawater desalination system

Abstract

The invention discloses a low-temperature low-pressure solar local-thermal-process seawater desalination system which comprises a steam generation system and a steam condensation collection system, wherein the steam generation system comprises a box body and a steam generator; the steam generator divides the box body into a steam chamber and a seawater compensating chamber which are respectively the upper and lower part structures; the top of the steam chamber is provided with a solar receiving window; the bottom of the seawater compensating chamber is provided with a seawater water inlet pipe and a concentrated brine water outlet pipe; the steam generator comprises a capillary pore layer and a solar energy absorbing coating deposited on the upper surface of the capillary pore layer; the solar energy absorbing coating is used for absorbing the solar energy and converting the solar energy into the heat energy; the capillary pore layer is used for delivering the seawater to the solar energy absorbing coating; the steam condensation collection system comprises a condenser, a vacuum pump and a fresh water outlet which are connected through pipelines; and an inlet of the condenser is connected with the steam chamber through a pipeline. The system only heats the seawater surface to form partial high temperature, so that the seawater is quickly evaporated. The non-evaporated part of the seawater is still kept in the low-temperature state, so the solar conversion efficiency is high.

Description

technical field [0001] The invention relates to a low-temperature and low-pressure solar local thermal seawater desalination system, in particular to a low-temperature and low-pressure solar local thermal seawater desalination system, which belongs to the field of seawater desalination and energy saving and emission reduction. Background technique [0002] Desalination of seawater is a method of separating salt from water in seawater to obtain fresh water. There are two basic energy utilization methods for desalination of seawater (or brackish water) using solar energy. One is to use solar power to drive seawater through a semipermeable membrane to achieve desalination without phase change, which is called a membrane method, such as solar reverse osmosis seawater desalination; the other is to use solar energy to generate heat to cause phase change in seawater to generate water vapor. The process of water vapor condensing to generate fresh water is called thermal method. T...

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