具有喷射制冷的SOFC/TRCC电冷联供系统4E分析  

4E analysis on power and cooling system based on SOFC/TRCC with ejector refrigeration cycle

作　　者：韩吉田[1] 刘财浩 葛艺 Han Jitian;Liu Caihao;Ge Yi(School of Energy and Power Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学能源与动力工程学院,济南250061

出　　处：《东南大学学报（自然科学版）》2023年第4期682-691,共10页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金国际(地区)合作交流资助项目(41761144067).

摘　　要：提出了一种通过跨临界CO_(2)循环(TRCC)和喷射制冷循环(ERC)回收固体氧化物燃料电池/燃气轮机(SOFC/GT)余热的新型电冷联供系统.在工程求解器(EES)软件环境下建立了系统的数学模型,从能量、㶲、环境和经济(4E)的角度对系统进行研究,分析了关键参数变化对系统性能的影响.结果表明:联供系统在设计工况下净输出功率为272.874 kW,可向用户提供15.785 kW冷负荷,系统总成本为0.288 8元/(kW·h);系统总发电效率、总㶲效率和能源综合利用效率分别为68.12%、66.60%和72.06%;增加燃料利用率或提高SOFC入口温度和增大TRCC透平入口压力都可提高联供系统的㶲效率,当空燃比达到10.88时,系统㶲效率达到最大值66.94%;增大燃料利用率和SOFC入口温度或降低TRCC透平入口压力可降低系统总成本,在空燃比为10.57时达到最小值0.280 8元/(kW·h).A new power and cooling cogenerating system was proposed for recovering solid oxide fuel cell/gas turbine(SOFC/GT)waste heat through transcritical carbon dioxide cycle(TRCC)and ejector refrigeration cycles(ERC).The system mathematical model was established by using the engineering equation solver(EES)software to study the influences of the key parameters on the system performances from the perspectives of energy,exergy,environment and economy(4E).The results show that the net output power and the cooling load of the cogenerating system are 272.874 and 15.785 kW with the total cost of the system being 0.2888 yuan/(kW·h)under the design condition.The system overall electrical,exergy and energy utilization efficiencies are 68.12%,66.60%and 72.06%,respectively.The exergy efficiency can be improved by increasing fuel utilization factor,SOFC inlet temperature and TRCC turbine inlet pressure.When the air-fuel ratio reaches 10.88,the maximum exergy efficiency of the system is 66.94%.The total cost of the system can be reduced by increasing fuel utilization factor and SOFC inlet temperature or decreasing TRCC turbine inlet pressure.When the air-fuel ratio is 10.57,the minimum total cost of 0.2808 yuan/(kW·h)is obtained.

关 键 词：固体氧化物燃料电池 跨临界二氧化碳循环 喷射制冷循环 4E分析 

分 类 号：TK019[动力工程及工程热物理]