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首页> 外文会议>ASME international mechanical engineering congress and exposition >ANALYSIS OF ADVANCED SUPERCRITICAL CARBON DIOXIDE POWER CYCLES WITH A BOTTOMING CYCLE FOR CONCENTRATING SOLAR POWER APPLICATIONS
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ANALYSIS OF ADVANCED SUPERCRITICAL CARBON DIOXIDE POWER CYCLES WITH A BOTTOMING CYCLE FOR CONCENTRATING SOLAR POWER APPLICATIONS

机译：具有底部循环的先进超临界二氧化碳功率循环在太阳能集中应用中的分析

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摘要

A number of studies have been performed to assess the potential of using supercritical carbon dioxide (S-CO_2) in closed-loop Brayton cycles for power generation. Different configurations have been examined among which recompression and partial cooling configurations have been found very promising, especially for concentrating solar power (CSP) applications. It has been demonstrated that the S-CO_2 Brayton cycle using these configurations is capable of achieving more than 50% efficiency at operating conditions that could be achieved in central receiver tower type CSP systems. Although this efficiency is high, it might be further improved by considering an appropriate bottoming cycle utilizing waste heat from the top S-CO_2 Brayton cycle. The organic Rankine cycle (ORC) is one alternative proposed for this purpose, however, its performance is substantially affected by the selection of the working fluid. In this paper, a simple S-CO_2 Brayton cycle, a recompression S-CO_2 Brayton cycle, and a partial cooling S-CO_2 Brayton cycle are first simulated and compared with the available data in the literature. Then, an ORC is added to each configuration for utilizing the waste heat. Different working fluids are examined for the bottoming cycles and the operating conditions are optimized. The combined cycle efficiencies and turbine expansion ratios are compared to find the appropriate working fluids for each configuration. It is also shown that combined recompression-ORC cycle achieves higher efficiency compared with other configurations.
机译：已经进行了许多研究，以评估在闭环布雷顿循环中使用超临界二氧化碳（S-CO_2）进行发电的潜力。已经研究了不同的配置，其中发现再压缩和部分冷却配置非常有前途，特别是在聚光太阳能（CSP）应用中。已经证明，使用这些配置的S-CO_2布雷顿循环能够在中央接收塔式CSP系统所能达到的工作条件下实现超过50％的效率。尽管此效率很高，但可以通过考虑使用来自顶部S-CO_2布雷顿循环的余热的适当底部循环来进一步提高效率。有机朗肯循环（ORC）是为此目的提出的一种替代方法，但是，其性能会受到工作流体的选择的很大影响。在本文中，首先模拟了简单的S-CO_2布雷顿循环，再压缩S-CO_2布雷顿循环和部分冷却的S-CO_2布雷顿循环，并将其与文献中的可用数据进行了比较。然后，将ORC添加到每个配置中以利用废热。检查不同的工作液的触底循环，并优化操作条件。比较组合的循环效率和涡轮膨胀比，以找到每种配置合适的工作流体。还显示了与其他配置相比，组合的再压缩-ORC循环实现了更高的效率。

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