【作者】 薛利超；

【导师】 王巍；

【作者基本信息】 大连理工大学 ， 流体机械及工程， 2008， 硕士

【摘要】 燃料电池(Fuel Cell)是将化学反应的化学能直接转化为电能的能量转换装置，其发电效率可达40％—60％，它的整体热电联产效率可达80％以上，有很好的发展前景。目前世界上许多发达国家和地区如美国、欧洲、日本等都很重视对燃料电池的研究开发和商业化。固体氧化物燃料电池(SOFC)是燃料电池的一种，由于它的排气温度很高，大约在900℃左右，有很大的余热利用价值。微型燃气轮机是在高温高压条件下工作。若将SOFC和微型燃气轮机(MGT)组成联合循环装置，不仅可以大大提高热效率，使能源得到充分利用，还可降低排放，减少污染。因此由燃料电池和微型燃气轮机组成的联合循环装置具有广阔的应用前景，特别在小户供电、分布式发电和热能装置上具有很大的吸引力，对其进行性能分析具有重要的现实意义。本文研究内容是本专业承担研发的大连理工大学—中国科学院大连化学物理研究所共同资助的联合探索基金项目：管型中温固体氧化物燃料电池加压操作及其与燃气轮机复合的理论模拟研究的一部分。本文中建立了氢氧固体氧化物燃料电池的数学模型，利用c语言所编制的计算机程序，分析出SOFC电池电压、输出功率、电流密度、燃料利用率、温度等对电池性能的影响；利用大型化工流程模拟软件Aspen Plus建立了以天然气为燃料的固体氧化物燃料电池和微型燃气轮机的联合循环模型，提出了燃料电池在加压和常压情况下不同联合循环结构，并对比分析了它们的性能特点。经济问题的增长和能源的短缺使得能源的高效利用、新能源的开发等成为目前能源发展的焦点问题。本文以此为出发点，分别探讨了SOFC在加压和常压下，其联合循环的不同发电循环结构，并进行了系统的数值分析研究。为SOFC+MGT未来的联合循环提供了有益的尝试。更多还原

【Abstract】 Fuel cell is a device that converts chemical energy into electricity directly from the reaction of fuel and oxidant. It can achieve electrical efficiency during 40%-60%. The overall combined heat and power efficiency is above 80%. So it has a better development prospect. At present, the developed countries and areas such as America, Europe, Japan and so on, they have focused on the fuel cell research and commercial. Solid oxide fuel cell （SOFC） is one kind of fuel cells. The exhaust gas temperature of SOFC is about 900℃, therefore it has the advantage of high temperature waste heat to recovery. Micro gas turbine （MGT） works at high temperature and pressure conditions. If the hybrid system which is combined SOFC and MGT is achieved, the hybrid system not only can improve the overall heat but also improve electrical efficiency. It also can reduce the emission and pollutants, and then be full use of energy. Therefore, combined SOFC and MGT will have great application prospect in distributed energy market. It is helpful to solve the energy question in researching combined system.The content of this paper is based on the funds of DLUT-DICP’s project which is combined intermediate temperature pressurized SOFC and MGT. In this paper, the H₂-O₂ SOFC model is built by c programming language. Then the parameters such as voltage, output power, current density, fuel utilization, operation temperature and so on are presented. The effects of them on SOFC are also presented. Combined SOFC and MGT System is built by the software Aspen Plus. In this hybrid system, the fuel is natural gas. The different hybrid systems have been built and analyzed. Then the performance and advantages of them are given.Highly effective energy utilization and new energy production become the focus of energy development with increasing in economy and lacking for energy sources in the world. The practical examples with SOFC-MGT are investigated in the fields of the different hybrid power systems and simulate with numerical ways. The results show a promising direction for SOFC+MGT application in the future.更多还原