基于SOFC/MGT/ORC的微型冷热电联供系统性能分析

Thermodynamic analysis of micro tri-generation system based on SOFC/MGT/ORC

提出一种基于SOFC/MGT/ORC的微型冷热电联供系统,首先建立并验证了联供系统数学模型,然后给出设计工况下联供系统的输入参数,重点分析在夏季工况下,燃料流率、燃料利用率、蒸汽碳比、压缩机压比等关键操作参数对系统性能的影响。结果表明,在夏季设计工况下,该联供系统发电效率及?效率分别为69.12%、64.4%,同时系统一次能源利用效率可达92.65%,比冬季设计工况高13.1%。

Thermodynamic analysis of a micro tri-generation system comprising of a solid oxide fuel cell(SOFC),a micro gas turbine(MGT),an organic Rankine cycle(ORC),and heat recovery devices for use as combined generation of cooling,heating and power is investigated in this paper.The mathematical model of the tri-generation system is developed and validated,the input parameters of system under the design condition are exhibited.A parametric study is performed to observe the effects of some key parameters such as the fuel flow rate,fuel utilization factor,steam to carbon ratio and compressor pressure ratio on the evaluation criteria of the system and its components.Results show that under the design conditions the system electricity and exergy efficiency are 69.12%,64.4% respectively in summer mode while at the same time the overall efficiency of the system can reach 92.65% which is 13.1% higher than that in winter.