Exergy Analysis of Combined Cycles: Part 1—Air-Cooled Brayton-Cycle Gas Turbines
Exergy Analysis of Combined Cycles: Part 1—Air-Cooled Brayton-Cycle Gas Turbines
复制标题
联合循环的火用分析：第 1 部分 - 风冷布雷顿循环燃气轮机
DOI：
10.1115/1.3240029
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发表时间：
1987
影响因子：
1.5
通讯作者：
M. El
中科院分区：
文献类型：
--
作者：
M. El
基于热力学第二定律的定量分析工具提供了对联合循环设计中遇到的复杂优化权衡的深入了解。无论是循环配置还是燃气涡轮机冷却技术，当考虑现有经验之外的方法时，这些工具都特别有价值。作者[1-3]使用简化的恒定属性模型提供了这种分析的框架。在本文中，这一主题的发展，包括实际的化学和热力学性质，以及相关的实际设计细节，反映当前的工程实践。第二定律模型被应用于计算和提供一个联合循环的低效率的来源的详细细分。使用GASCAN程序进行了逐级涡轮机冷却流和损失分析计算，并给出了损失故障的示例。结果表明，控制循环效率随涡轮机进口温度变化的主要相互作用是燃烧不可逆性和涡轮机冷却损失之间的相互作用。压缩机和压降损失相对较小。本文第二部分对蒸汽底循环进行了详细的分析和损失分析。
Quantitative analytical tools based on the second law of thermodynamics provide insight into the complex optimization tradeoffs encountered in the design of a combined cycle. These tools are especially valuable when considering approaches beyond the existing body of experience, whether in cycle configuration or in gas turbine cooling technology. A framework for such analysis was provided by the author [1-3] using simplified, constant-property models. In this paper, this theme is developed to include actual chemical and thermodynamic properties as well as relevant practical design details reflecting current engineering practice. The second-law model is applied to calculate and provide a detailed breakdown of the sources of inefficiency of a combined cycle. Stage-by-stage turbine cooling flow and loss analysis calculations are performed using the GASCAN program and examples of the resulting loss breakdowns presented. It is shown that the dominant interaction governing the variation of cycle efficiency with turbine inlet temperature is that between combustion irreversibility and turbine cooling losses. Compressor and pressure-drop losses are shown to be relatively small. A detailed analysis and loss breakdown of the steam bottoming cycle is presented in Part 2 of this paper.