SOFC/Micro-GT混合循环系统性能分析

Performance analysis of SOFC/micro-GT hybrid system

基于总能系统概念讨论固体氧化物燃料电池/微型燃气轮机(SOFC/Micro-GT)间接混合发电系统及其特点,建立SOFC电池堆及系统的物理、数学模型,对700kW级混合系统的稳态全负荷运行工况进行分析,结果表明混合系统净发电效率可达68.3%,加上回收的余热,系统整体热效率可达82.9%。该文还探讨了燃料利用率、平均电流密度、电池温度、压力及蒸汽/碳比等主要参数对系统性能的影响规律,为SOFC/Mciro-GT混合发电系统的设计、优化提供参考依据。

Hybrid solid oxide fuel cell and micro gas turbine systems （SOFC/Micro-GT） are expected to be used as distributed power systems due to their high efficiency and low pollutant emissions. The whole SOFC/micro-GT system and its key components were modeled using the total energy system （TES）. Detailed calculations for the full load performance of a 700 kW indirect hybrid system show that the SOFC/Micro-GT hybrid system can achieve a net electrical efficiency of 68.3% and a system efficiency （including waste heat recovery） of 82. 9%. The analysis also studied the effects of the main parameters such as the fuel utilization rate, the average current density, the cell temperature and pressure and the steam-carbon ratio on the system characteristics for the design and optimization of SOFC/Micro-GT hybrid systems.