Design and Analysis of Embedded Thermoelectric Conversion System for Marine Diesel Exhaust Duct
-
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.
-
Key words:
- marine diesel engine /
- exhaust duct /
- embedded fin /
- thermoelectric conversion /
- numerical analysis /
- experiments /
- design /
- flow field
-
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 -
[1] Gude V G, Nirmalakhandan N, Deng S G. Renewable and sustainable approaches for desalination[J]. Renewable and Sustainable Energy Reviews, 2010, 14(9):2641-2654 doi: 10.1016/j.rser.2010.06.008 [2] 柳长昕, 郑子升, 吕延枫, 等.基于两级温差发电的船舶废热回收试验研究[J].船舶工程, 2017, 39(1):30-34, 67 http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=cbgc201701007Liu C X, Zheng Z S, Lyu Y F, et al. Experimental study for vessel exhaust heat recovery based on two-stage thermoelectric generation[J]. Ship Engineering, 2017, 39(1):30-34, 67(in Chinese) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=cbgc201701007 [3] Georgopoulou C A, Dimopoulos G G, Kakalis N M P. A modular dynamic mathematical model of thermoelectric elements for marine applications[J]. Energy, 2016, 94:13-28 doi: 10.1016/j.energy.2015.10.130 [4] 马宗正, 马涛, 王新莉, 等.冷却系统能量回收温差发电器设计方法研究[J].机械科学与技术, 2017, 36(5):787-792 http://jxkx.cbpt.cnki.net/WKA2/WebPublication/paperDigest.aspx?paperID=c924d785-8c03-41e3-be4c-6635b142f4dcMa Z Z, Ma T, Wang X L, et al. design method for thermoelectric generator based on cooling system's energy recovery[J]. Mechanical Science and Technology for Aerospace Engineering, 2017, 36(5):787-792(in Chinese) http://jxkx.cbpt.cnki.net/WKA2/WebPublication/paperDigest.aspx?paperID=c924d785-8c03-41e3-be4c-6635b142f4dc [5] 熊兵, 陈林根, 孟凡凯, 等.船舶柴油机废气余热驱动热电发电性能研究[J].节能, 2016, 35(2):4-10 http://d.old.wanfangdata.com.cn/Periodical/jien201602001Xiong B, Chen L G, Meng F K, et al. Study of thermalelectric power generation technology driven by marine diesel engine waste heat[J]. Energy Conservation, 2016, 35(2):4-10(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/jien201602001 [6] 谢辉, 聂尔冰.电控冷却柴油机热电余热回收系统总能效率优化研究[J].内燃机工程, 2017, 38(2):1-7 http://d.old.wanfangdata.com.cn/Periodical/nrjgc201702001Xie H, Nie E B. Overall efficiency optimization of diesel engines with electronic cooling system and waste heat recovery thermoelectric generator[J]. Chinese Internal Combustion Engine Engineering, 2017, 38(2):1-7(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/nrjgc201702001 [7] 李彦哲, 赵玉龙, 何为, 等.核心流强化传热对温差发电器性能的影响[J].工程热物理学报, 2017, 38(4):862-868 http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gcrwlxb201704029Li Y Z, Zhao Y L, He W, et al. The influence of the core flow heat transfer enhancement on the performance of thermoelectric generator[J]. Journal of Engineering Thermophysics, 2017, 38(4):862-868(in Chinese) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gcrwlxb201704029 [8] Gou X L, Xiao H, Yang S W. Modeling, experimental study and optimization on low-temperature waste heat thermoelectric generator system[J]. Applied Energy, 2010, 87(10):3131-3136 doi: 10.1016/j.apenergy.2010.02.013 [9] Astrain D, Vián J G, Martinez A, et al. Study of the influence of heat exchangers' thermal resistances on a thermoelectric generation system[J]. Energy, 2010, 35(2):602-610 http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=7bf785df56f3e216f78a507d9b154b0d [10] 吴艳艳, 孙奉仲, 李飞, 等.H型翅片管束空气流动及换热特性[J].山东大学学报, 2014, 44(6):90-94 http://d.old.wanfangdata.com.cn/Periodical/sdgydxxb201406014Wu Y Y, Sun F Z, Li F, et al. Numerical study on the air motion of H-type finned tubes and heat transfer characteristics[J]. Journal of Shandong University, 2014, 44(6):90-94(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/sdgydxxb201406014 [11] Kim T Y, Negash A A, Cho G. Waste heat recovery of a diesel engine using a thermoelectric generator equipped with customized thermoelectric modules[J]. Energy Conversion and Management, 2016, 124:280-286 doi: 10.1016/j.enconman.2016.07.013