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High-temperature, point-focus, pressurised gas-phase solar receivers: A comprehensive review

机译：高温，点对焦，加压气相太阳能接收器：全面审查

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摘要

Gas-phase solar receivers use atmospheric or pressurised gas as their heat transfer fluid (HTF). The ideal gas phase receiver would provide high thermal efficiency and high HTF outlet temperature with low pressure drop and low capital cost. In practice, these four objectives are hard to achieve simultaneously since it is difficult to (cost-effectively) overcome the intrinsically poor heat transfer performance between the solid absorber and the gaseous HTF. Thus, this review provides an in-depth look at the recent progress towards solving this challenge of pressurised gas-phase receivers to identify the remaining knowledge/research gaps. In general, gas-phase receivers can be classified as direct or indirect solar absorbers and by the type of heat transfer enhancement (HTE) employed to address the poor absorber-to-HTF heat transfer rate. The present review suggests the receiver designs that show the most promise for further improvement from each of the active, passive and compound HTE methods. This study also finds that there is a need for more proof-of-concept tests for these receiver designs, since the number of studies which include real prototypes operating under real weather conditions is limited. Based on a review of successful prototyping research, this review suggests proper prototyping procedures for high-temperature receivers. Overall, the authors believe the present study presents an up-to-date, comprehensive review of the progress on gas-phase receivers, along with some meaningful, specific guidance on the necessary next steps in their development. This is significant because gas-phase receivers represent the best near-term solution for pushing solar systems to higher temperatures, enabling integration with advanced/combined cycles and solar thermochemical reactors with endothermic chemical reactions at high temperature (e.g. mineral processes and solar fuels).
机译：气相太阳能接收器使用大气或加压气体作为传热液（HTF）。理想的气相接收器将提供高耐热效率和高HTF出口温度，低压下降和低资本成本。在实践中，这四个目标难以同时实现，因为难以（成本有效）克服固体吸收器和气态HTF之间的内在差的传热性能。因此，本综述提供了深入的了解最近的旨在解决加压气相接收器的这一挑战，以确定剩余的知识/研究差距。通常，气相接收器可以被分类为直接或间接的太阳能吸收剂，并通过用于解决差的吸收剂 - 至HTF传热速率的传热增强（HTE）的类型。本综述表明，接收器设计表明，从每个活性，无源和复合HTE方法中进一步改进，表现出最新的承诺。本研究还发现，由于包括在真实天气条件下运行的实际原型的研究数量有限，因此需要对这些接收器设计进行更多概念证明测试。基于对成功原型研究的综述，本综述表明了高温接收器的适当原型手术程序。总体而言，作者认为，本研究提出了对气相接收者的进展情况的最新综述，以及一些有意义的具体指导，就其发展所必需的下一个步骤。这是显着的，因为气相接收器代表了将太阳能系统推向较高温度的最佳近期解决方案，使得与高温下的吸热化学反应和太阳能热化学反应器能够与高温（例如矿物过程和太阳能燃料）的过热化学反应集成。

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