Research On Seawater Desalination Technical Approach Based On Wind Energy Utilization

As the global population increases and economy develops, human demand for water is growing faster and faster and shortage problem of water resource is gradually exposed. Just like the "energy crisis", lack of fresh water resources is increasingly becoming the focus of people’s attention. Therefore, it is imperative to search for an energy-saving and efficient way to make fresh water, desalination is energy-intensive industry. Vigorously developing renewable energy and making it used for desalination is an important way to address the energy-guzzling problem of seawater desalination. Study on the use of wind energy for seawater desalination has become a hotspot in the field of desalination research.This article has designed three sets of seawater desalination system which directly use of wind energy based on seawater desalination method of multi-stage flash, multi-effect distillation, reverse osmosis. Due to the nature features of fluctuation, intermission and instability of wind energy, system design respectively makes the three energy storage technology of vacuum energy storage, compressed air energy storage and water storage used in wind energy utilization under the principle of energy storage technology. Also coupling of three different seawater desalination methods, this formed three kinds of seawater desalination system utilizing wind energy respectively based on multi-stage flash, multi-effect distillation and reverse osmosis.As the energy consumption of multi-stage flash seawater desalination system is heat and vacuum, this article presents that vacuum energy storage technology should be used to wind energy utilization. Similarly, as the energy consumption of multi-effect distillation seawater desalination system is heat, this article presents that compressed air energy storage technology should be used to wind energy utilization. Both above types of energy storage technologies could meet the large-scale use of wind energy, at the same time, they provide energy for seawater desalination. Energy storage technology and seawater desalination optimize and couple with each other. As the energy consumption of reverse osmosis seawater desalination system is pressure, this article presents a kind of pressure balance device. It plays a role of energy storage and water storage. Also it delivers sea water that has a smooth, uninterrupted flow and appropriate pressure which meet the work requirements of reverse osmosis membrane.Based on the above work, through thermodynamic exergy analysis to the seawater desalination systems utilizing wind energy respectively based on multi-stage flash and multi-effect distillation, this article obtains the analytic expression of exergy loss for the two system. And this article makes further thermodynamic exergy analysis to the multi-effect distillation seawater desalination system and obtains the analytic expression of exergy loss for the multi-effect distillation seawater desalination system and compressed air energy storage systems; for the seawater desalination system utilizing wind energy based on reverse osmosis, the article makes simulation calculation of the operational characteristics of seawater desalination system utilizing wind energy combining with specific project example based on theoretical analysis. This work verifies the feasibility of the system. As a preliminary study on seawater desalination system which directly use of wind energy, this article discusses the basic models and analysis method for system reliability analysis according to reliability engineering foundation. This article obtains the system reliability analysis model for the three sets of seawater desalination system which directly use of wind energy by a series of simplification. Finaly, this article obtains the analytic expressions of system reliability.