管式SOFC数学模型及系统性能分析

固体氧化物燃料电池(SOFC)是一种高效低污染的新型能源。该文基于物质和能量守恒并耦合流体流动、热量产生和传递以及电化学知识建立了以天然气为燃料的管式固体氧化物燃料电池的数学模型,对模型进行求解,并分析系统参数(电流密度、工作压力、燃料的摩尔流量等)对系统性能(发电量、发电效率等)的影响。结果表明:SOFC系统的发电效率可以达到50.73%。通过增加单电池个数来减小电流密度可以增加系统发电量和发电效率,但是会增加系统投资;增大燃料电池的工作压力可以改善系统的性能;而增加燃料的摩尔流量(燃料利用率不变)会使系统的发电效率降低。

Mathematical Model of Tubular Solid Oxide Fuel Cell and System Performance Analysis

Solid Oxide Fuel Cell(SOFC) is a new type of energy featuring high efficiency and low pollution.In this paper a mathematical model for a natural gas-fed,tubular SOFC is presented based on mass and energy balance,fluid flow,heat generation and transfer and electrochemistry.The simulation of the model and analysis of the effects of the system parameters(current density,operating pressure,fuel flow-rate) on the system performance(electrical power,electrical efficiency) is performed.The results show that the electrical efficiency of the SOFC system can achieve 50.73%.It is also found that decreasing the current density through increasing the total number of the tubular SOFCs will improve the electrical power and the electrical efficiency,but it will increase the system investment.Increasing the operating pressure can improve the system performance,and increasing the fuel flow-rate(while keeping the fuel utilization rate unchanged) will cause the electrical efficiency to decrease.