Solid Oxide Fuel Cell Trigeneration System and Performance Analysis

被引：0
|
作者：
Wang S. [1 ,2 ]
Lu X. [1 ,2 ]
Mei S. [1 ,2 ]
Zhu Y. [1 ,2 ]
机构：
[1] School of Mechanical Engineering, Tianjin University, Tianjin
[2] Key Laboratory of Efficient Utilization of Low and Medium Grade Energy of Ministry of Education, Tianjin University, Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2021年 / 54卷 / 10期
关键词：
Solid oxide fuel cell; Thermoelectric generator; Trigeneration; Waste heat utilization;
D O I：
10.11784/tdxbz202010022
中图分类号：
学科分类号：
摘要：
Trigeneration systems can improve the efficiency of primary energies. Solid oxide fuel cells(SOFC)can be incorporated in the top cycle of trigeneration systems due to their high working temperature and cleanliness. Considering the large amount of waste heat in SOFC exhaust gas, a trigeneration system with a thermoelectric generator in the intermediate cycle to recover the waste heat of SOFC exhaust was proposed. The trigeneration system in this study included an internal reforming SOFC, an afterburner, a thermoelectric generator, and a lithium bromide absorption chiller and hot water unit, which realized the reuse of waste heat and greatly improved the energy efficiency of the system. Based on the established mathematical models of all units, the influence of the circulating water utilization forms on the system performance was further studied, providing a new perspective on energy saving and water saving. The influence of the area of the thermoelectric generator, the fuel flow, and the air flow on the system output power was analyzed, providing a reference for determining the optimal operating conditions of the system. Results indicated that the highest total efficiency of the SOFC trigeneration system was achieved by adopting the water recycling form C with the total efficiency reaching 94% and 65% at heating and cooling conditions, respectively. With the increasing area of the thermoelectric generators, the increase of the thermoelectric generator output power reduced the overall efficiency of the system. Meanwhile, with increasing fuel flow rate, the thermoelectric generator output power gradually increased and the SOFC power generation exhibited a trend of initially increasing and then decreasing. The overall efficiency of the system gradually increased. With increasing airflow rate, the thermoelectric generator output power gradually decreased. The SOFC power generation first increased and then decreased, while the overall efficiency of the system first decreased and then gradually increased. © 2021, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
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页码：1061 / 1069
页数：8
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