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Cold-state experimental study on discharge characteristics of solid particles in a gravity driven moving bed solar receiver

机译：重力驱动移动床太阳能接收器中固体颗粒排放特性的冷态实验研究

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摘要

A small-scale multi-tube experimental system was established to pretest the workability of a gravity driven moving bed solar receiver with its absorbing section containing an insert in each tube. Discharge characteristics of solid particles with various particle sizes range from 149 mu m to 1359 mu m in mean diameter are studied at ambient temperature. In multi-tube experiments, the discharge rate in each tube is almost uniform. In single-tube experiments, the packed height in the particle dispenser exhibits negligible influence on the mass flow rate. Three models have been set up to predict the mass flow rate in the without-insert case of particle flow experiments. Among them, Model-3 is shown to obtain the minimum mean error of 1.54% compared with the experimental results, and proved that the influence of particle size and orifice diameter on the gas-solid slip velocity should be considered. Effect of the insert on particle flow characteristics was also investigated. The added insert in the tubes is proved to increase the mass flow rate of the finest particles. However, for particles coarser than 642 mu m in mean diameter, this effect is insignificant and the mass flow rate in with-insert case is consistent with predicted results by Beveloo equation and Model-3. Besides, the experimental results of particles finer than 297 mu m in with-insert case are larger than predicted results by Model-3 and less than that by Beveloo equation. It is noteworthy that two types of flow instability are observed with specific experimental variables, indicates that particle layer thickness, particle size and orifice diameter are relevant parameters to affect the granular flow state. Hence, optimizing structural parameters and selecting suitable size of particles are necessary to avoid flow instability in this type of solid particle solar receiver.
机译：建立了一个小型多管实验系统，以预先测试重力驱动的移动床太阳能接收器的工作性能，该吸收器的吸收部分在每个管中均包含一个插入物。在环境温度下研究了平均粒径为149μm至1359μm的各种粒径的固体颗粒的放电特性。在多管实验中，每个管中的放电速率几乎是均匀的。在单管实验中，颗粒分配器中的填充高度对质量流率的影响可忽略不计。已经建立了三个模型来预测无插入粒子流实验情况下的质量流率。其中，模型3与实验结果相比，具有最小的1.54％的平均误差，证明了应考虑粒径和孔口直径对气固滑移速度的影响。还研究了插入物对颗粒流动特性的影响。事实证明，在管中添加插件可以提高最细颗粒的质量流速。但是，对于平均直径大于642μm的颗粒，这种影响不明显，并且在插入状态下的质量流速与Beveloo方程和Model-3的预测结果一致。此外，在插入状态下，粒径小于297μm的颗粒的实验结果大于Model-3的预测结果，小于Beveloo方程的预测结果。值得注意的是，通过特定的实验变量观察到两种类型的流动不稳定性，这表明颗粒层厚度，粒径和孔直径是影响颗粒状流动状态的相关参数。因此，在这种类型的固体颗粒太阳能接收器中，必须优化结构参数并选择合适的颗粒尺寸，以避免流动不稳定。

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  • 来源
    《Solar Energy》 |2020年第1期|14-26|共13页
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    Chinese Acad Sci Key Lab Solar Thermal Energy & Photovolta Syst 6 Beiertiao Beijing 100190 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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