在太阳能热发电站中,抛物面槽式集热系统多回路的流量分配特性对集热工质出口温度和电站运行性能具有重要影响。传统U型集热回路采用调节阀可实现各回路流量的平衡分配,但对系统的控制水平要求较高,且建设成本较大。该文以熔盐槽式集热系统为研究对象,提出采用Z型布置结合母管变径的新型集热回路,以实现多回路流量自平衡;通过开展流量分配的理论设计计算,以及基于Apros软件搭建的集热系统动态仿真模型,研究太阳直接法向辐射DNI、入口质量流量变化以及云遮扰动工况下,Z型集热回路的流量分配、出口温度和回路压降的稳态和动态变化规律。研究结果表明,槽式集热回路Z型布置结合母管变径的方式在稳态和瞬态工况下都具有较好的流量自平衡特性。
Abstract
In the parabolic trough concentrating solar power plants, the multi-circuit flow distribution characteristics in the solar field have an important influence on the outlet temperature of the HTF (heat transfer fluid) and the operating performance of the plants. The traditional U-type solar field achieves its balanced flow distribution by regulating valves, which has higher requirements for the control level and higher construction cost. In this paper, parabolic trough solar field with molten salt as HTF is chosen as the research object, and a new Z-type layout of solar field is proposed, which realizes multi-loop self-balanced flow distribution by changing the diameter of the main-pipes. Through theoretical design and dynamic simulation based on Apros software, the steady state and dynamic performances of flow distribution, outlet temperature and pressure drop of the Z-type heat collecting loop under the change of DNI, inlet mass flow and cloud disturbance are studied. The results show that the Z-type solar field layout combined with the change of the main pipe diameter has good flow self-balance performance under both steady-state and dynamic conditions.
关键词
太阳能热发电 /
集热器 /
流体流动 /
熔融盐 /
Apros
Key words
solar thermal power /
collectors /
flow of fluids /
molten salt /
Apros
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