固体氧化物燃料电池与燃气轮机联合发电系统模拟研究

Simulation Study of a Combined Power Generation System Incorporating a Solid-oxide Fuel Cell and a Gas Turbine

固体氧化物燃料电池 (SOFC)是一种高效低污染的新型能源。建立了以天然气为燃料的固体氧化物燃料电池和燃气轮机 (GT)联合发电系统的计算模型 ,并对具体系统进行计算。结果表明 :SOFC与GT组成的联合发电系统 ,发电效率可达 6 8% (LHV) ;加上利用的余热 ,整个系统的能量利用率可以超过 80 %。文中还分析了SOFC的工作压力、电流密度等参数对系统性能的影响 ,提高工作压力 ,可以增加电池发电量 ,提高系统的发电效率 ;

A solid-oxide fuel cell (SOFC) is a new type of energy featuring high efficiency and low pollution. A calculation model is set up for a combined power generation system, which comprises a solid-oxide fuel cell with natural gas serving as its fuel and also a gas turbine (GT). The calculation results of the above system indicate that the combined power generation system composed of SOFC and GT can attain a power generation efficiency of 68% (based on low heating value). With the waste heat being put to use the energy utilization rate of the whole system can surpass 80%. The impact of such parameters as SOFC operating pressure and its current density on the system performance was analyzed. An increase in its operating pressure can lead to an increase in cell electricity generation and power generation efficiency of the system. On the other hand, an increase in current density may result in a decrease of electricity generation for both the SOFC and the whole system.