| This thesis is supported by the Key Research and Development(R&D)Projects of Shanxi Province in high technologies fields "The research and application of key technology of thermoelectric power generation based on boiler waste heat recovery"(Grant No.201903D121015).The drastic change of environment and climate and the sustainable development of energy promote the research of new energy technology.The current rapid climate change is mainly due to the use of fossil fuels in the process of energy consumption.Due to the challenge of climate change,all countries in the world have actively participated in the global climate summit and reached an agreement that China plans to achieve the goal of carbon neutrality by 2060.The current feasible measures include improving the efficiency of primary energy and increasing the use of renewable energy.As one of the methods to improve the efficiency of primary energy,thermoelectric technology has a huge development prospect.Therefore,this paper uses the thermoelectric technology to recover the waste heat resources of boiler flue gas.Through the combination of theory,simulation and experiment,the thermoelectric system with waste heat recovery is built.Firstly,based on ANSYS platform,the model of waste heat recovery thermoelectric power generation system is built,and the fin distribution in the heat collection area is designed twice,focusing on the four parameters of the transverse fin distribution model: bottom fin width,fin height,fin thickness and outlet diameter,as well as three optimization objectives: temperature difference at the cold and hot end of thermoelectric generator,temperature difference at the hot end of thermoelectric generator,temperature difference at the cold end of thermoelectric generator,temperature difference at the hot end of thermoelectric generator,temperature difference at the cold end of thermoelectric generator,temperature difference The sensitivity curve and mathematical model expression between optimization parameters and optimization objectives are obtained,and the optimal structure of transverse fin distribution is obtained.Secondly,in the output power control of waste heat recovery thermoelectric power generation device,the digital power supply with more flexible control mode is selected.According to the output voltage and power of the system,the hardware and software scheme is determined,the PCB design of the circuit is completed,and its performance is tested.Finally,in the experimental study,the appropriate heat source,cold source and corresponding test equipment are selected,the structure of the simulation device is machined,and the platform of waste heat recovery thermoelectric power generation system is built in the experimental environment.The temperature uniformity of the cold and hot end of the thermoelectric fin under two kinds of fin structure and the performance comparison between simulation and experiment before and after the optimization model are studied,The performance of the controller is verified in the system. |
