Availability Analysis of Combined Gas Turbine and SOFC with External Reformer

• Main Authors: Yu-Hsiang Lin, 林裕翔
• Other Authors: Chen-I Hung
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/59171872507302072659

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 93 === 　Because the exhausting of petrolic energy which supporting modern life and using petrolic energy has done the environment great damages such as air pollutions and greenhouse effect, it is of great urgency to find an alternative energy solution. The solid oxide fuel cell (SOFC)has a working temperature about 800°C to 1000°C. Comparing to other types of fuel cells, SOFC does have many advantages like high mechanism strength, wide range of fuel selections, and the likelihood of combining a gas turbine to increase system efficiency. 　In this lecture we suggest a SOFC/GT combine system, which uses methane as fuel and includes an external reformer and an afterburner. After the complete combustion of residues of methane, hydrogen, and carbon monoxide, the afterburner would provide the heat that needed by the reforming of the methane and the preheating of the fuel and the air. We use knowledge of thermodynamics and electric chemical processes to build a mathematical model of the system, and calculate the work done, the heat needed, and inlet/outlet states of each component when system is working. By changing reformer`s pressure and temperature and SOFC stack’s pressure, temperature, and utilization rate of hydrogen, we analyze the differences of system performances and all system components` inlet/outlet states. Finally we bring out availability analysis to clarify availability looses in all system components as changing system parameters.