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首页> 外文会议>ASME(American Society of Mechanical Engineers) Energy Sustainability Conference; 20070627-30; Long Beach,CA(US) >EXERGETIC PERFORMANCE ANALYSIS OF A GAS TURBINE CYCLE INTEGRATED WITH SOLID OXIDE FUEL CELLS
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EXERGETIC PERFORMANCE ANALYSIS OF A GAS TURBINE CYCLE INTEGRATED WITH SOLID OXIDE FUEL CELLS

机译：集成了固体氧化物燃料电池的燃气轮机的运动性能分析

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This paper deals with an exergetic performance analysis of a gas turbine cycle integrated with SOFCs with internal reforming. As the efficiency of a gas turbine cycle is mainly defined by the maximum temperature at the turbine inlet, this temperature is fixed at 1573 K. for the analysis. In the cycle considered, the high-temperature gaseous flow from the turbine heats the input flows of natural gas and air, and is used to generate pressurized steam which is mixed with natural gas at the SOFC stack inlet to facilitate its conversion. The application of SOFCs provides the opportunity to reduce the exergy losses of the most irreversible process in the system: fuel combustion. Depending on the SOFC stack efficiency, the energy efficiency of the combined cycle reaches 70-80% which compares well to the efficiencies of 54-55% typical of conventional combined power generation cycles. Parametric studies are also undertaken to investigate how energy and exergy efficiencies of the integrated system change with variations in operating conditions. An increase in the efficiency of SOFCs is attained by increasing the fuel cell active area. Achieving the highest efficiency of the SOFC stack leads to a significant and non-proportional increase in the stack size and cost, and simultaneously to a decrease in steam generation, reducing the steam/methane ratio at the anode inlet and increasing the possibility of catalyst coking. Accounting for these factors, likely operating conditions of the SOFC stack in combination with a gas turbine cycle are presented.
机译：本文对集成了SOFC并经过内部重整的燃气轮机循环进行了性能分析。由于燃气轮机循环的效率主要由涡轮机入口处的最高温度确定，因此该温度固定为1573K。在所考虑的循环中，来自涡轮机的高温气体流加热了天然气和空气的输入流，并用于生成加压蒸汽，该加压蒸汽在SOFC烟囱入口处与天然气混合以促进其转化。 SOFC的应用提供了减少系统中最不可逆过程（燃料燃烧）的火用损失的机会。取决于SOFC堆的效率，联合循环的能源效率达到70-80％，这与常规联合发电循环的54-5％的典型效率相当。还进行了参数研究，以研究集成系统的能量和火用效率如何随操作条件的变化而变化。通过增加燃料电池的有效面积，可以提高SOFC的效率。实现SOFC烟囱的最高效率会导致烟囱尺寸和​​成本的显着和非比例的增加，同时会导致蒸汽产生的减少，阳极入口处的蒸汽/甲烷比降低以及催化剂结焦的可能性增加。考虑到这些因素，提出了SOFC烟囱与燃气轮机循环结合使用的可能工况。

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