基于LNG与汽车尾气大温差下的温差发电研究

Study on thermoelectric power generator with large temperature difference between LNG and exhaust gas

为了有效利用液化天然气(LNG)汽车中LNG的冷能以及排气的热能,提出利用半导体温差发电器,分析计算了LNG与发动机排气的可回收能,设计了回收利用冷能和热能的流程,计算了各个状态点的参数,建立了大温差下的多级温差发电器模型,并对其输出功率和热电转换效率进行了计算。结果表明,利用半导体温差发电器来回收LNG的冷能和排气热能的方案具有可行性;在大温差的条件下,多级温差发电器能有效地提高热电转换效率。

Thermoelectric generator was suggested in order to make use of the cold energy of liquefied natural gas （LNG） and the waste heat of exhaust gas in LNG vehicles. The recovery energy of LNG and exhaust gas were compared. A recovery system for the LNG vehicles was proposed and the correlative parameters of the system were calculated. Multi-stage thermoelectric generator was built as well as the power and efficiency were calculated. The results show that the system is feasible for the energy recovery. The design of the multi-stage thermoelectric generator was suitable for large temperature difference.