Dynamics Modeling of a Solid Oxide Fuel Cell Combined Heat and Power System

• Main Author: 吳健彰
• Other Authors: Chen, Tsung-Lin
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/72790882415114220535

碩士 === 國立交通大學 === 機械工程學系 === 100 === The aim of this study is the build a mathematic model for a solid oxide fuel cell combined heat and power ( SOFC-CHP ) system. This system consists of SOFC stacks, a Reformer, an after-burner, and two heat exchangers. The model of each subsystem was developed on the basis of “ control volume ” using molar and energy conservation. The mathematic models were developed for the planar type SOFC, counter-flow type heat exchangers, and a Reformer for natural gas (CH_4). The Matlab/Simulink software was used to construct the dynamics for each subsystem. And then, the dynamics models of these subsystems were linked together to complete the overall system simulations. The whole system consists of 20 states and nonlinear ordinary differential equations. Finally, we used a 10KW SOFC-CHP system as a design example. The simulation results indicate that the system operating temperature is about 900k, the SOFC stacks have 10kw power output, the energy conversion efficiency of SOFC is about 40%, and the energy efficiency of the overall SOFC-CHP system is 79%.