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Thermal hydraulic RELAP5 model for a solar direct steam generation system based on parabolic trough collectors operating in once-through mode

机译：基于抛物槽收集器的直流直接运行的太阳能直接蒸汽发生系统的热力水力RELAP5模型

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摘要

Direct steam generation in parabolic-trough solar collector requires reliable and efficient two-phase flow modelling tools. One-dimensional models based on 6 equations are a suitable approach. The present article aims to show that RELAP5 is able to simulate a single-loop system including transients caused by sudden events like solar collector defocusing or fast changes in direct solar irradiance. The numerical results have been validated with experimental data from the DISS facility located at Plataforma Solar de Almeria. Six operation days have been compared using a new heat loss correlation, which has been measured on the same facility. The implemented model considers connection pipes, elbows, change of height, thermal insulation in the passive sections, collectors slope and absorbers. The numerical results are in good agreement with the experiments and it proves that RELAP5 can reproduce the underlying thermo-hydraulic phenomena. An additional numerical study of severe slugging in the connection pipes has been done, where two adjacent collectors linked by a connection pipe have been simulated at a pressure of 5 bar. Based on 374 tests, slugging phenomenon has been reported for low values of inlet mass flow rate and low quality in the entering two-phase mixture. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在抛物槽式太阳能收集器中直接产生蒸汽需要可靠且有效的两相流建模工具。基于6个方程的一维模型是一种合适的方法。本文旨在表明RELAP5能够模拟单回路系统，包括由突发事件（例如太阳能集热器散焦或直接太阳辐照度的快速变化）引起的瞬变。数值结果已由位于阿尔梅里亚广场（Plataforma Solar de Almeria）的DISS设施的实验数据验证。使用新的热损失相关性比较了六个工作日，该热损失相关性已在同一设施上进行了测量。所执行的模型考虑了连接管，弯头，高度变化，无源部分中的隔热，集热器坡度和吸收器。数值结果与实验结果吻合良好，证明RELAP5可以重现潜在的热工现象。还对连接管中的严重塞进行了另一项数值研究，其中在5 bar的压力下模拟了由连接管连接的两个相邻收集器。根据374个试验，据报导，由于进入的两相混合物中入口质量流率的值较低且质量较低，因此产生了团块现象。 （C）2017 Elsevier Ltd.保留所有权利。

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