Slot-type solar sea water desalination device based on membrane distillation

Abstract

The invention discloses a slot-type solar sea water desalination device based on membrane distillation, and belongs to the field of seawater desalination. Regarding the current mainstream solar seawater desalination technology (such as solar multi-effect evaporation, solar multi-stage flash evaporation, solar reverse osmosis and the like) has limitations of high investment, low solar heat utilization, low system device efficiency and the like, and heat energy required by seawater distillation in the invention comes from solar energy emitted by a slot-type condenser mirror, wherein solar energyis reflected and condensed onto an arc heat collection tube in a membrane assembly, and is used for heating seawater flowing in the tube; after the seawater in the heat collection tube is heated, vapor pressure deficit is formed on two sides of a hydrophobic distillation membrane in the membrane assembly due to temperature difference; due to the pressure deficit of two sides of the membrane, moisture in seawater penetrates through pores of the hydrophobic membrane in a vapor mode, and a vapor stream is formed in the channel on the other side of the hydrophobic membrane; and finally the vaporis condensed to obtain liquid fresh water, and is collected in a fresh water tank.

Description

technical field [0001] The invention belongs to the field of seawater desalination, in particular to a trough solar seawater desalination device based on membrane distillation. Background technique [0002] Seawater desalination technology is essentially a technology to separate the salt and water in seawater through certain physical, chemical or physicochemical processes with the help of specific devices and equipment. The specific operation is to take fresh water from seawater, or to remove the salt in seawater to obtain fresh water. Nowadays, thermal method and membrane method have become two important mainstream technical methods of seawater desalination technology, and multi-stage flash evaporation, low-temperature multi-effect distillation and compressed air distillation are the three main methods of thermal seawater desalination. Although the multi-stage flash evaporation technology is mature and reliable and does not require seawater pretreatment, it has high requir...

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Problems solved by technology

[0004] At the same time, the current mainstream solar desalination technology (such as solar multi-effect evaporation, solar multi-stage flash evaporation, solar reverse osmosis, etc.) has limitations such as high investment, low solar thermal utilization rate, serious pollutant discharge, and low system device efficiency. Facing the problems of high energy consumption and low quality of produced water by osmotic membrane method

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