基于两级温差发电的船舶废热回收试验研究

Experimental Study for Vessel Exhaust Heat Recovery Based on Two-stage Thermoelectric Generation

对于船舶柴油机而言,其所做功的30%都以废热的形式随尾气排放到了大气中,而利用温差发电技术回收船舶余热进行发电具有极其广阔的发展前景,因此提出了一种利用船舶柴油机尾气废热进行两级温差发电的新型装置。在对两级温差发电系统进行建模后,搭建了两级温差发电装置并进行了测试。理论分析和试验结果表明,该装置利用温差发电技术对船舶余热进行回收是可行的。当热端温度达到473 K时,该温差发电试验装置可输出功率250 W,系统热效率为5.35%,相比单级温差发电在相同条件下4.04%的热效率,该系统提高了32%。最后,文章对系统优化和装置的进一步改进进行了探讨。

For the marine engine, about 30% of the primary energy is discharged as waste heat in the exhaust gas. The recovering of energy from heat is a significant promising application of thermoelectric generation（TEG）. Therefore, a novel prototype for two-stage TEG from vessel exhaust is put forward. After the modeling of the system prototype, an experiment structure is constructed and tested. The results of both theoretic analysis and experiment data show feasibility of the prototype employed for marine engine exhaust heat recovery. The prototype can generate a maximum power output of about 250 W when operating at hot side temperature 473 K. The system thermal efficiency can achieve 5.35% which is increased by 32% compared with the single stage TEG of 4.04% in the same experimental conditions. The system optimization and future improvement of the prototype is also discussed.