摘要
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。
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 correlative parameters of systems are calculated and analyzed.The generation efficiency of TEGs is calculated and the recovery power of each system is analyzed.It is concluded that the output power of the vaporizer system is larger than that of the self-warming system; TEG with optimized multi-layer material brings larger output power than that with single-layer material for both systems.
出处
《制冷学报》
CAS
CSCD
北大核心
2014年第6期21-27,34,共8页
Journal of Refrigeration
基金
国家科技支撑计划课题(2012BAA08B03)
高等学校博士学科点专项科研基金(20130201110069)资助项目
陕西省2012年自然科学基础研究计划(2012JQ7028)资助项目~~
关键词
温差发电
燃料系统
液化天然气
汽车
thermoelectric
fuel system
liquefied natural gas
vehicle
作者简介
厉彦忠,男(1958-),教授,博士生导师,(029)82668725,E-mail:yzli-epe@mail.xjtu.edu.cn。研究方向:LNG冷能回收,火箭低温燃料管理,ICF冷冻靶温度场控制。现在进行的研究项目有:国家科技支撑计划课题--基于LNG冷能全液体空分系统及其关键技术等。