Solar photo-thermal seawater desalination integrated system and method

Abstract

The invention discloses a solar photo-thermal seawater desalination integrated system and method, and relates to the field of seawater desalination. The system comprises a solar heat collection system, a seawater flash heat recovery system and a seawater desalination control system. The solar heat collecting system comprises a solar water inlet, a pressurizing circulating pump, a solar heat collector and a solar water outlet. The seawater flash evaporation heat recovery system is an integrated system and comprises a steam connecting pipe, a distillation layer, a fresh water layer, a seawater layer, a seawater inlet pipe, a middle heat conduction plate, a seawater replenishing port, a distilled water outlet, a sewage draining exit, a vacuum pump and other key devices. The seawater flash evaporation heat recovery system is of a three-layer structure, wherein a middle heat conduction plate is vertically penetrated, and the heat in the fluid of the two lower layers is recovered for heatingfresh seawater on the uppermost layer. The flow channel is separated into a snake shape, cold and hot fluid flows back to strengthen the heat recovery effect, and the heating pressure of the solar heat collector is reduced. The system is high in integration degree and intelligent degree, fully recovers waste heat of water vapor, distilled water and high-salt sewage, and has high fresh water production efficiency.

Description

Technical field: [0001] This patent relates to the technical field of solar thermal application and seawater desalination, and relates to an integrated solar thermal seawater desalination system and a method for desalination of seawater using it. Background technique: [0002] The shortage of water resources is a global problem at present, and desalination of the abundant seawater on the earth is an important way to solve the problem of water shortage. However, traditional seawater desalination often requires high energy consumption, which is difficult to achieve in some energy-shortage areas. Therefore, a green, efficient and sustainable seawater desalination method is urgently needed to alleviate the above-mentioned crisis. [0003] As a renewable energy source, solar energy is clean and safe, and does not pollute the environment. Using solar energy to desalinate seawater is a project that benefits the country, the people, and the environment, and meets the requirements of...

AI Technical Summary

Problems solved by technology

Technologies such as solar multi-stage flash evaporation and solar multi-effect boiling are easy to combine with solar energy, but there are still many shortcomings. Conventional solar desalination systems mainly have the following problems: (1) The latent heat of steam condensation generated during the distillation process has not been effectively obtained. Utilization, resulting in energy loss to the atmospheric environment, such as the traditional passive solar distiller, the water production per unit lighting area is too low, only 5-10kg / m 2 d; (2) The amount of circulating seawater in the conventional distillation device is large, and the total heat capacity is large, which weakens the driving force of evaporation; (3) The distillation system mainly uses natural convection as the main heat transfer mode, and the heat transfer efficiency is low, which limits the system performance. (4) The solar heat collection area is high, the initial investment of the system is too large, and the cost of water production is too high; (5) The low density and instability of solar energy affect the stable and safe operation of the system, especially the impact on the water production of the system

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