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DEVELOPMENT OF A HIGH-TEMPERATURE SOLAR GAS CYCLE SYSTEM WITH THERMAL ENERGY STORAGE

机译：高温太阳能循环系统的热能储存

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The use of gas cycles in solar thermal power plants has recently gained considerable attention, especially when used in conjunction with central receiver systems where peak temperatures can be very high, leading to high cycle efficiencies. One of the main advantages of using gas cycles for solar power plants is that they eliminate the need for continuous supply of water for cooling towers, making them particularly suitable for arid regions. Various gas cycle concepts have been proposed and tested, most of which involve using concentrated sunlight to directly heat compressed air or other gases. However, one of the main shortcomings of direct heating of air is that thermal energy storage becomes less viable. A number of solutions to this limitation have been proposed, but none has yet been fully demonstrated. A promising solution to the thermal energy storage problem is being developed. It involves the use of sand or other fine granular materials as the primary solar energy absorber and thermal energy storage medium. In this concept, sunlight is concentrated on a receiver in which sand is heated to temperatures that can approach 1000 C. A portion of this sand exchanges heat with air, which is then fed to a suitable gas cycle. The remainder of the sand is diverted to a well-insulated tank where it is stored for later use. One variation of this system is shown in the accompanying figures, which include a general view of the tower and heliostat field and a detail view of the central receiver concept. This work builds on the experience of other developers with sand as the proposed storage medium in, trough plants, as well as the work of other investigators such as the work on the solid particle receiver concept that was introduced and tested at the National Solar Thermal Test Facility in Sandia National Laboratories [1] and [2]. The proposed system is expected to overcome the issue of low solar energy absorption efficiency through the use of a novel cavity receiver design. Furthermore,-the system described in this work has a number of other novel features, including a patent-pending mechanism for transferring heat from the sand to air, and a compact and integrated storage system that minimizes land construction costs. This paper describes the conceptual features of the proposed system in some detail. It also summarizes the progress made so far in this project and outlines upcoming activities particularly in designing a 300 kW (thermal) test system whose construction is expected to commence in 2011.
机译：在太阳能热电厂中使用气体循环最近在与中央接收器系统结合使用的情况下使用了相当大的关注，其中峰值温度可以非常高，导致高周期效率。对太阳能发电厂使用气体循环的主要优点之一是它们消除了对冷却塔连续供水的需求，使其特别适用于干旱区。已经提出和测试了各种气体循环概念，其中大多数是使用浓缩的阳光来直接热压缩空气或其他气体。然而，直接加热空气的主要缺点之一是热能储存变得不太可行。已经提出了许多对此限制的解决方案，但没有已经完全证明了这一限制。正在开发出热能储存问题的有希望的解决方案。它涉及使用砂或其他细粒度作为主要太阳能吸收器和热能储存介质。在这种概念中，阳光集中在接收器上，其中砂被加热到可以接近1000℃的温度。该砂的一部分与空气交换热量，然后将其加热到合适的气体循环。剩余的砂子被转移到绝缘罐，其中储存以供以后使用。该系统的一个变型示于附图中，包括塔和Heliostat领域的一般视图和中央接收器概念的细节视图。这项工作构建了其他开发商的经验，作为拟议的储存介质，槽厂，以及其他调查人员的工作，如在国家太阳能热试验中引入和测试的固体粒子接收器概念的工作桑迪亚国家实验室的设施[1]和[2]。建议的系统预计通过使用新型腔接收器设计来克服太阳能吸收效率的低噪声问题。此外，在该工作中描述的系统具有许多其他新颖特征，包括用于将热量从沙子传递到空气的专利待处理机构，以及紧凑且集成的存储系统，最小化陆地建设成本。本文详细介绍了所提出的系统的概念特征。它还总结了该项目到目前为止所取得的进展，并概述即将到来的活动，特别是在设计300千瓦（热）测试系统时，其建设预计2011年的开工。

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