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首页> 外文期刊>Journal of solar energy engineering >Thermodynamic Study of Advanced Supercritical Carbon Dioxide Power Cycles for Concentrating Solar Power Systems
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Thermodynamic Study of Advanced Supercritical Carbon Dioxide Power Cycles for Concentrating Solar Power Systems

机译：用于聚光太阳能系统的高级超临界二氧化碳功率循环的热力学研究

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摘要

Supercritical CO_2 (S-CO_2) operated in a closed-loop Brayton cycle offers the potential of higher cycle efficiency versus superheated or supercritical steam cycles at temperatures relevant for concentrating solar power (CSP) applications. Brayton-cycle systems using S-CO_2 have a smaller weight and volume, lower thermal mass, and less complex power blocks versus Rankine cycles due to the higher density of the fluid and simpler cycle design. The simpler machinery and compact size of the s-CO_2 process may also reduce the installation, maintenance, and operation cost of the system. In this work we explore s-CO_2 Brayton cycle configurations that have attributes that are desirable from the perspective of a CSP application, such as the ability to accommodate dry cooling and achieve greater than 50% efficiency, as specified for the U.S. Department of Energy Sun-Shot goal. Recompression cycles combined with intercooling and/or turbine reheat appear able to hit this efficiency target, even when combined with dry cooling. In addition, the intercooled cycles expand the temperature differential across the primary heat exchanger, which is favorable for CSP systems featuring sensible-heat thermal energy storage.
机译：在与聚光太阳能（CSP）应用相关的温度下，以闭环布雷顿循环运行的超临界CO_2（S-CO_2）具有比过热或超临界蒸汽循环更高的循环效率的潜力。与朗肯循环相比，使用S-CO_2的布雷顿循环系统具有更小的重量和体积，更低的热质量以及更简单的动力块，这是由于流体的密度更高且循环设计更简单。 s-CO_2工艺更简单的机械和紧凑的尺寸也可以减少系统的安装，维护和运营成本。在这项工作中，我们探索s-CO_2布雷顿循环配置，这些配置具有从CSP应用程序角度来看理想的属性，例如适应美国国家能源部规定的干式冷却并达到50％以上的效率的能力。 -射门。结合中冷和/或涡轮再热的再压缩循环似乎能够达到该效率目标，即使与干冷结合使用也是如此。此外，中间冷却循环扩大了整个主热交换器的温差，这对于具有显热热能存储功能的CSP系统是有利的。

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  • 来源
    《Journal of solar energy engineering》 |2013年第4期|041007.1-41007.7|共7页
  • 作者

    Craig S. Turchi; Zhiwen Ma; Ty W. Neises; Michael J. Wagner;

  • 作者单位

    National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401;

    National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401;

    National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401;

    National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401;

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