Research On Pressure Energy Recover System Of Ocean Thermal Energy Conversion Using Zeotropic Working Fluids

Today,with limited fossil resources,increased energy consumption and increasingly serious environmental pollution,it’s necessary to develop clean renewable energy.There are lots of marine energy resources in the ocean,among which the ocean thermal energy resources can be converted into electricity and other energy for human use,it will be able effectively alleviate various energy problems and environmental problems.Therefore,the study of Ocean Thermal Energy Conversion(OTEC)technology has become one of the ways to develop ocean thermal energy.Japan,the United States and other countries have conducted large-scale experimental equipment to verify the feasibility and stability of OTEC at present.Research on OTEC is still concentrated in the basic stage in China.This paper will study the thermodynamic cycle of OTECThe working fluids of OTEC thermodynamic cycle can be divided into pure working fluids and mixed working fluids.In contrast,the zeotropic mixture in mixed working fluids have obvious advantages and characteristics and are widely used.This paper will study the utilization of pressure energy in the thermodynamic cycle of OTEC.The specific research contents of this paper are as follows:In Chapter 1,introduce the principle of OTEC,the basic thermodynamic cycle systems and the comprehensive utilization of ocean thermal energy.Summarize the status of OTEC thermodynamic cycles in recent years,and introduce the working principles and performance analysis of different cycles.In Chapter 2,introduce the properties of zeotropic working fluids,the properties of ammonia-water solution and the calculation of its parametersIn Chapter 3,propose three different OTEC cycles for using pressure exchanger,hydraulic turbine and ejector.Analyze the working principle of each cycle and key equipment in cycles.Based on the first law of thermodynamics,the mathematical model and calculation process of the whole cycle system are established.In Chapter 4,the specific calculation of each cycle system is carried out.Analyze and discuss the impact of the net output power and thermal efficiency of each cycle when the conditions such as seawater temperature,working fluid concentration and cycle pressure change.Compare and analyze the difference of the three cycles under the same conditions.In Chapter 5,determine the design parameters of the ejector-cycle test system,design of select key equipment,complete the layout design of the system and so on.In Chapter 6,summarize this paper and provide suggestions for the research deficiencies and the follow-up work.