Sea water desalination system and desalination method

Abstract

The invention discloses a sea water desalination system and desalination method. The sea water desalination system comprises a sea water filter module, a heating module, a distillation module, a heatexchange module and a control module, sea water is preliminarily filtered by the sea water filter module, the filtered sea water is heated by the solar heating module and a wind power generation device or power supply of a grid electricity system, the sea water enters the distillation module to evaporate the seal water when being heated to reach set temperature, water vapor pumped from the distillation module is condensed by the heat exchange module to form fresh water, and strong salt water generated after evaporation in the distillation module flows into a strong salt water tank. According to the system, solar energy and wind energy serve as renewable energy and are sufficiently utilized, the solar energy and the wind energy have great significance for saving of conventional energy and environment protection, a conventional grid power supply system is increased and serves as standby energy, and normal operation of a system can be ensured when the solar energy and the wind energy arein short supply.

Description

technical field [0001] The invention relates to the field of seawater treatment, in particular to a seawater desalination system and a desalination method. Background technique [0002] my country's fresh water resources are both poor and uneven, the per capita water volume is low, and the time and geographical distribution are very uneven; in the past 10 years, the economic growth in various regions has been rapid, coupled with the lack of rainfall for several consecutive years, and the serious pollution of many water sources , the contradiction between water supply and demand is more prominent; the country continues to take various measures to make up for the huge gap between the shortage of fresh water resources and the rapid economic development; Like coastal cities, which are rich in seawater resources, they should make full use of seawater and take seawater desalination as one of the important ways to solve the shortage of freshwater; in the past 10 years, my country has...

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Problems solved by technology

[0003] At present, the main methods used in seawater desalination technology are reverse osmosis and distillation; reverse osmosis and other membrane materials used in reverse osmosis, membrane element production technology is mature, membrane and membrane components have high performance, low application cost, and low energy consumption. Conducive to energy saving, low cost of water production, and the desalination of seawater by reverse osmosis is a unit combination, the construction scale can be expanded step by step, which is convenient for popularization and application, but the life and anti-pollution ability of the reverse osmosis membrane are limited, and the reverse osmosis membrane needs to be replaced regularly. Important accessories such as reverse osmosis membranes and high-pressure pumps need to be imported, and the cost is high; distillation equipment is expensive and energy-consuming, which is not conducive to large-scale desalination projects; in addition, some solar desalination technologies (such as solar multi-stage flash evaporation , solar multi-effect distillation and solar reverse osmosis, etc.) still have the limitations of high energy consumption, large investment and suitable for large-scale seawater desalination projects. Therefore, it is necessary to develop seawater desalination systems with high efficiency, simple structure, easy maintenance and good adaptability It has always been a research hotspot at home and abroad

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