Research And Development Of Waste Heat Semiconductor Thermoelectric Generator

With the high-speed development of industrialization, global environmental deterioration and energy crisis are threatening the long-term steady development of mankind, for this reason, government of all countries have given attention and support to the research and use of green environmental protection technology. Thermoelectric generation technology, as an entire solid-state energy conversion way, can directly transform the heat energy into the electrical energy using the thermoelectric transformation material and without chemical reaction or fluid medium. Thus it is more economical, environmentally friendly and convenient. It has played an irreplaceable role in some special fields such as aviation and military affairs. In addition, with the development and updater of semiconductor technology, thermoelectric generation technology with semiconductor as its major conversion material is developing progressively into industrialization and civil use. Especially under the current upsurge of the energy saving and emission reducing, thermoelectric generation technology has played a pivotal role in the recycling of low grade energy for its unique advantage.The thesis is based on basic principle of thermoelectric generation technology to do theoretical and experiment research into the waste heat thermoelectric generation technology. Some basic work have completed are as follows:1) Based on basic principles of the thermoelectric generation technology and basic effect, then by adapting the finite-time thermodynamics theory, the thesis establishes the general and two-stage semiconductor thermoelectric generator theoretical model and performance analysis mathematical model in the case of the internal and external irreversibility. Then the thesis takes the work efficiency,output power and energy efficiency as the objective functions to analyze the performance characteristics of the two-stage semiconductor thermoelectric generator and calculate the maximum efficiency,output power and energy efficiency of the generator in different conditions with emulation simulated calculation. Thereby, the internal structure of the generator is optimized and the optimal range of the electric current is determined.2) In the aspect of experimental research, the author designs and builds a platform which taking waste water as thermal source to test the performance of semiconductor thermoelectric generation system. On this foundation, the author optimizes and improves the entire waste heat thermoelectric generation system, does an experimental research on thermoelectric generation system which has been improved, completes the research to the generator's performance under mufti-operating modes and different temperature differences, obtains the reliable empirical datum and summarizes a series of movement rules establishes theoretical foundation for further research on thermoelectric generation technology.3) Based on the waste heat thermoelectric generation system and employed the simulation method, the change of systematic performance dates with temperature difference under different loads has been analyzed. And the reasonability of theoretical model has been verified through analysis and comparison of imitate and test.The thesis summarizes the laws that the electricity generation performance parameters such as work efficiency,output power and energy efficiency and so on change along with external circuit, temperature operating and other factors through the research on the performance of waste heat source semiconductor thermoelectric generator. Especially, the research on thermoelectric generation system which taking waste water as thermal source provides some practicable methods in the low-grade heat source directly using by semiconductor thermoelectric generator.