Investigation On The Performance Characteristics Of Thermoradiative Cells And Their Coupling Systems

With the rapid development of modern society,various countries over the world have gradually realized that existing non-renewable energy cannot meet human needs and will cause extremely serious pollution to the environment.Hence,it is imperative to develop new energy instead of traditional energy.In this thesis,by taking two types of devices for developing new energy as the research objects,two models including a molten carbonate fuel cell-thermoradiative cell(MCFC-TRC)coupling system and intermediate thermoradiative cells(IBTRC)are constructed.The main research contents include the following two parts:The first part focuses on the performance characteristics of the MCFC-TRC coupling system.By considering that high-temperature fuel cells(HTFCs)will emit a large amount of waste heat during normal operation,a TRC is used to recycle the waste heat to produce additional power output.In this part,the working principles of the coupling system are described in detail,and the expressions of the power output density(POD)and efficiency are derived.According to the conservation of energy,an energy balance equation of the coupling system that bridges the two subsystems is established.By taking the POD and efficiency as the objective functions,the performance characteristics of the coupling system are evaluated and the optimal selection criteria of relevant parameters are provided.The percentage improvements of the maximum power output densities of the MCFC-TRC coupling system and other MCFC-based coupling systems in the existing literatures are compared,demonstrating the superiority of the MCFC-TRC coupling system.The research methods in this part are universal and are also suitable for the coupling systems composed of other HTFCs and TRCs.The second part focuses on the performance characteristics of IBTRCs.That is,introducing an intermediate band to the TRC to improve its performance.In this part,the work:ing principles of the IBTRC are briefly described,and the expressions of the POD and efficiency are derived.By taking the POD and efficiency of the IBTRC as the objective functions and by combining the numerical simulation results,the performance characteristics of the system are evaluated and the optimal selection criteria of the key parameters are provided.Some non-ideal factors affecting the performance of the IBTRC are discussed,and the methods for the quantitative analysis about them are given.The research contents in this thesis can not only contribute to the development of new energy sources,but also provide certain guidance for the design and manufacture of new energy conversion devices.