Design and Analysis of Embedded Thermoelectric Conversion System for Marine Diesel Exhaust Duct
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摘要: 提出了一种应用于船舶柴油机排气管道上的嵌入式鳍片热电转换系统，并对其结构进行了新型设计；建立排气管道热电转换系统三维模型，分析废气管道中嵌入式热电模组在不同条件下的流场、温度场以及电场分布特性；搭建排气管道热电转换系统模拟试验装置，验证数值计算结果准确性。结果表明：数值计算结果与实验结果相吻合，最大发电功率误差均在5%以内，嵌入式鳍片模组的发电功率比无嵌入式鳍片模组的发电功率提升了约3.2倍；系统设计过程中，需同时考虑鳍片高度、鳍片数量与流场特性、泵功率、净发电功率之间的关系，使其达到最大发电量，该装置通过鳍片增加传热面积，降低热阻，进而提升热电模组发电性能。Abstract: An embedded fin thermoelectric conversion system for marine diesel exhaust duct is proposed, and its structure is designed in a new way. Then the three-dimensional model of the thermoelectric conversion system is established to analyze the flow field, temperature field and electric field distribution characteristics of embedded thermoelectric module in exhaust duct under different conditions. Finally, the test device of the exhaust duct thermoelectric conversion system is built to verify the accuracy of the numerical analysis. The results show that:the analysis results are in good agreement with the experimental results. The maximum generation power error is less than 5%. The generation power of embedded fin module is about 3.2 times higher than that of non-embedded fin module. In the process of system design, the relationship between fin height, fin number and flow field characteristics, pump power and net power all should be taken into account to achieve maximum power generation. The device increases the heat transfer area through the fin, reduces the thermal resistance, and further improves the power generation performance of the thermoelectric module.
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Key words:
- marine diesel engine /
- exhaust duct /
- embedded fin /
- thermoelectric conversion /
- numerical analysis /
- experiments /
- design /
- flow field
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表 1 热电晶片结构性能参数
参数名称 数值 P-N
半导体晶粒长度LP-N/mm 2.4 晶粒高度HP-N/mm 1.5 传热导系数kP-N/(W·(m·K)-1) 1.6 塞贝克系数αP-N/(V·K-1) 温度系数 电阻率ρP-N/(Ω·m) 9.0×10-6 铜导体 厚度Hcu/mm 0.25 传热导系数kcu/(W·(m·K)-1) 403 塞贝克系数αcu/(V·K-1) 1.4×10-5 电阻率ρcu/(Ω·m) 1.44×10-8 陶瓷基板 厚度Ht/mm 0.65 传热导系数kt/(W·(m·K)-1) 20 
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