Performance Study Of Thermoelectric Generation Based On Micro Channel Heat Pipe Array

Due to the global multi-regional energy crisis and increasingly severe environmental problems,countries around the world increasingly attach importance to the development of sustainable clean energy and the improvement of energy efficiency.Thermal power generation technology is a convenient thermoelectric conversion technology,and its compact,no mechanical movement and maintenance-free structural advantages are favored by researchers in many heat recovery applications.Micro channel heat pipe arrays(MHPAs)are heat transfer elements with super high thermal conductivity,generally made of aluminum and copper,but with more thermal conductivity than any known metal.In this paper,MHPAs are applied to improve the output capability of thermal power generation,and relevant structures are put forward.Finally,a thermal power generation heat recovery device based on MHPAs for thermal recovery of flue gas is optimized by combining the scenario of residual heat recovery of flue gas.The main research work of this paper is as follows:(1)Considering the performance differences of different thermal power generation modules,experimental tests are carried out for different thermal power generation modules.Through experiments under various hot-end temperature conditions,it is found that the performance of thermoelectric power generation module is strongly correlated with temperature.Bismuth Telluride-based thermoelectric materials generally exhibit fluctuations in thermal conductivity and conductivity at high temperatures and of varying magnitudes.On the macro level,the open-circuit voltage and temperature difference of thermoelectric power generation module at the same temperature in high temperature zone are different.(2)A temperature-differential power generation structure based on cooling end heat dissipation of MHPAs is proposed.Under different heat source conditions,the influence of heat source temperature and the inclination and height of the MHPAs on the output performance of thermoelectric power generation was studied experimentally,and the coupling effect of heat source temperature and MHPAs on the output performance was analyzed based on the internal mechanism.The results show that the thermal power generation system based on MHPAs with cold-end heat dissipation has deep application potential and maintains good output performance at temperatures above 130 ℃.The effect of the inclination and height of the micro channel heat pipe array on the service performance varies with the temperature of the heat source.There is an optimum inclination in general and the higher the temperature of the heat source,the better the height.(3)To solve the existing problems of residual heat collection from flue gas,a heat recovery device for flue gas was designed based on MHPAs.The heat collection and heat dissipation parts of the device are optimized by simulation analysis.The results show that the three groups of thermal recovery units placed parallel in the flue gas duct can provide an average temperature difference of about 93 ℃ for the thermal power generation module without affecting the internal flue gas flow.The whole residual heat recovery unit can provide an output power of 52.92 W without relying on additional energy.