Comparative Study of Solar Thermal Brayton Cycles Operated With Helium or Argon
Comparative Study of Solar Thermal Brayton Cycles Operated With Helium or Argon
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氦气或氩气太阳能热布雷顿循环的比较研究
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
D. Bohn
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文献类型：
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作者：
K. Kusterer;René Braun;N. Moritz;T. Sugimoto;K. Tanimura;D. Bohn
聚光太阳能发电（CSP）厂通常使用以水/蒸汽操作的朗肯循环作为能量转换循环。由于太阳能中央接收器技术可以提供高于900 ° C的接收器流体出口温度，开放式和封闭式燃气涡轮机技术成为有前途的替代方案。闭式太阳能布雷顿循环采用合适的工质可以达到与水/蒸汽朗肯循环相似或更高的热效率，但具有淡水消耗少的优点。本文介绍了闭式太阳能布雷顿循环采用氦气或氩气作为工质的热力学和过程研究的比较结果。循环的主要部件是两个带中间冷却器的轴流压缩机、一个回热器和一个轴向涡轮机。太阳能热量由中央接收器技术提供。假设传递到循环的热量是恒定的，并且涡轮机入口温度为900 ° C。基于热力学考虑的结果，执行两个循环的第一个一维设计方法。对闭式布雷顿循环的热力学和工艺研究结果表明，两种工质的热效率均在46%以上。设计考虑表明，两种循环都是可行的，但就设计尺寸而言，如果与氦循环相比，氩基循环可以用更少的级和更紧凑的方式构建。
Concentrating Solar Power (CSP) plants often use Rankine cycles operated with water/steam as energy conversion cycles. Since the solar central receiver technology could provide receiver fluid outlet temperatures higher than 900°C, open and closed gas turbine technologies become a promising alternative. Closed solar Brayton cycles operating with appropriate fluids can reach similar or higher thermal efficiencies than water/steam Rankine cycles but have the advantage of less consumption of fresh water.This paper presents the results of a comparative thermodynamic and process study of closed solar thermal Brayton cycles operated with Helium or Argon as working fluids. The main components of the cycles are two axial compressors with an intercooler, a recuperator and one axial turbine. The solar heat is fed in by a central receiver technology. It is assumed that the transferred heat to the cycles is constant and the turbine inlet temperature is 900°C.A first one-dimensional design approach for both cycles is performed based on the results of the thermodynamic considerations. The major parameters like stage types, number of stages, rotational speed, etc. are determined and discussed.The thermodynamic and process investigation results for the described closed Brayton cycles show that thermal efficiencies over 46% can be established for both fluids. The design considerations show that both cycles are feasible, but with respect to design dimensions the Argon based cycle can be built up with fewer stages and more compact, if compared to the Helium cycle.Copyright © 2013 by ASME