Research On Seawater Desalination Technology Driven Directly By Ocean Current Energy

Energy is one of the most powerful motivators of human development.The depletion of fossil fuels in the world has given human beings a wake-up call to the energy crisis.Today the development of new energy sources has drawn the attention of all countries in the world.In the face of the energy crisis,our country is also facing the crisis of freshwater resources.Taking the island city Zhoushan as an example,the power resources and freshwater resources are very valuable,while abundant ocean current energy is its unique resource advantage.Considering its own specific situations,this thesis proposed solutions that use ocean current to drive high-pressure seawater pump to desalinate seawater with the method of reverse osmosis.Finally,the rationality of the system was demonstrated through the simulation analysis.The contents of each chapter are as follows:The first chapter introduced the research background and significance of the subject,and fully investigated the current research status of seawater desalination in the field of new energy in the world.The second chapter analyzed the principle of energy harvesting of rotor from energy and force perspective through Betz's theory and elemental momentum theory respectively,which provided a theoretical support for the modeling of the rotor.Then the principle of realizing the maximum power point tracking of the rotor was analyzed through the rotor's dynamic research.The third chapter put forward the specific plans of the ocean current drive seawater desalination system,introduced each component of the system and its working principle in detail,analyzed the advantages and disadvantages of each scheme,and determined the concrete research scheme of the paper was seawater desalination system driven directly by ocean current energy.Then the specific parameters of those components were calculated and determined according to the demand of permeate production.Then through market research the selection of the components was conducted.In addition,the hydrocyclone in the pretreatment system was designed,simulated and experimented.In the fourth chapter,the principle of realizing the maximum power point tracking of the rotor was studied through the energy harvesting and torque analysis of the rotor.Combined with the load control,the method to realize the maximum water production of the system was introduced.In the fifth chapter,the mathematical model of each component of the system was established.Through AMESim-Simulink co-simulation,the maximum energy capture and the maximum water production were achieved.The energy consumption of the system was compared and analyzed.The simulation results showed that the low-power system can desalinate seawater at low energy consumption with variable ocean current velocity and the water production can meet the design requirement.The sixth chapter summarized the work of the thesis,and prospected the future research work.