CAJ | 학술논문

为实现液化天然气(LNG)汽车的节能,提出了利用温差发电器(TEG)回收发动机排气(EG)的废热和低温燃料的冷能。指出了基于冷源所在的低温区,以及 EG 与 LNG 之间的大温差这两个特点,TEG 的热电转换效率会高于常规。基于对小型 LNG汽车中典型燃料系统的分析,设计了进行能量回收的两种系统流程,计算了其中各状态点的参数﹑及各换热器中布置温差发电器后的热电转换效率,得到了系统总的回收功率。结果表明,汽化器系统的回收功率大于自复温系统；在两种系统中,合理选取多种材料相较于仅用单种材料,TEG 的回收功率更大。
위실현액화천연기(LNG)기차적절능,제출료이용온차발전기(TEG)회수발동궤배기(EG)적폐열화저온연료적랭능。지출료기우랭원소재적저온구,이급 EG 여 LNG 지간적대온차저량개특점,TEG 적열전전환효솔회고우상규。기우대소형 LNG기차중전형연료계통적분석,설계료진행능량회수적량충계통류정,계산료기중각상태점적삼수﹑급각환열기중포치온차발전기후적열전전환효솔,득도료계통총적회수공솔。결과표명,기화기계통적회수공솔대우자복온계통；재량충계통중,합리선취다충재료상교우부용단충재료,TEG 적회수공솔경대。
To enhance the energy efficiency in the liquefied natural gas (LNG) vehicles, thermoelectric generator (TEG) is suggested in recovering the waste heat of the exhaust gas (EG) and the cold energy of the LNG.The TEGs here get higher efficiency than conventional ones, for they work with heat sinks at cryogenic temperatures and there are large temperature differences between EG and LNG.Based on the analyzing of the typical fuel system in the small LNG vehicles, two recovery systems for the LNG vehicles are proposed and the correla_tive parameters of systems are calculated and analyzed.The generation efficiency of TEGs is calculated and the recovery power of each sys_tem is analyzed.It is concluded that the output power of the vaporizer system is larger than that of the self_warming system; TEG with opti_mized multi_layer material brings larger output power than that with single_layer material for both systems.