基于LNG冷■与燃料电池余热利用的TRCC串联系统

TRCC series system based on LNG cold energy and fuel cell waste heat utilization

提出一种基于固体氧化物燃料电池(solid oxide fuel cell, SOFC)和跨临界二氧化碳循环(transcritical carbon dioxide cycle,TRCC)的联合发电系统,采用跨临界二氧化碳循环来回收SOFC的排气余热,同时利用了LNG冷量[火用]。建立该系统的数学模型,分析参数变化对系统性能的影响。结果表明,在设计条件下,SOFC、TRCC和整个系统的热效率分别为64.2%、22.4%和74.1%,系统热效率随着燃料电池入口温度增加而增加,以及水蒸气碳比的增加而降低;系统热效率随着TRCC的透平入口压力的升高而升高。

A cogeneration system based on solid oxide fuel cell(SOFC for short)and transcritical carbon dioxide cycle(TRCC for short)was proposed.The transcritial carbon dioxide cycle was used to recover the exhaust heat of the SOFC while utilizing the LNG refrigeration capacity.The mathematical model of the system was established,and the influence of parameter changes on system performance was analyzed.The results showed that under the design conditions,the thermal efficiencies of SOFC,TRCC,and the whole system were 64.2%,22.4%,and 74.1%,respectively.The system thermal efficiency increased with the inlet temperature of the fuel cell and decreased with the increase of the steam-carbon ratio.The thermal efficiency increased as the turbine inlet pressure to the TRCC increased.