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Characteristics of Axial and Radial Development of Solids Holdup in a Countercurrent Fluidized Bed particle solar receiver

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Journal of Thermal Science 2021年第6期30卷 2223-2240页

作者： JIANG Kaijun WANG Fengli KONG Yanqiang XU Chao DU Xiaoze MOE Key Laboratory of Power Station Energy Transfer Conversion and System North China Electric Power UniversityBeijing 102206China School of Energy and Power Engineering Lanzhou University of TechnologyLanzhou 730050China

A novel particle solar receiver(PSR)with gas-solids countercurrent fluidized bed(CCFB)was *** cold-mold prototype was set up to investigate the gas-solids flow structure by using optical fiber *** local solids holdup distribution,its evolution with various operating conditions and the fluctuations of the local flow structures were investigated *** results show that the novel CCFB can achieve much higher solids holdup(~9%)compared to the traditional downer ones(~l%).The solid particles are mainly distributed in the near-wall region and the particles are more difficult to get a fully developed state in the near-wall *** excellent gas-solids mixing and contacting demonstrated by the standard deviation and intermittency index means a better wall-to-bed heat transfer *** distribution of the solid particles in the CCFB transport tube is revealed,which can provide a significant reference for the structure design of the hot-mold ***,the research can fill in the research gap in the gas-solids counterflow field.

关键词： concentrated solar power particle solar receiver countercurrent fluidized bed optical fiber probe local solids holdup

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Experimental Investigation on the Hydrodynamic Characteristics of Fluidized Bed particle solar receiver with Gas-Solid Countercurrent Flow Pattern

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Journal of Thermal Science 2021年第6期30卷 2241-2253页

To design a particle solar receiver(PSR),a vital energy conversion system,is still a bottleneck for *** study presents a novel PSR based on countercurrent fluidized bed(CCFB)technology,named CCFB *** this design,downward-moving particles are subjected to the action of an up-flow gas to reduce the falling speed and enhance the radial disturbance,and hence increase the residence time of particles and improve the heat transfer.A cold-mold visual experimental setup is *** influence factors are investigated experimentally,including the superficial gas velocity,solid flux,aeration gas,particle size and transport tube *** results indicate that the maximum solid holdup can exceed 9%or so with fine particles of diameter d_(p)=113.5 μm and a tube diameter of 40 *** is proved that the CCFB can operate stably and adjust the solid flux *** results of this study provide a new structure for PSRs in the concentrated solar power field and could fill the research insufficiency in the gas-solid counterflow field.

关键词： particle solar receiver gas-solid two-phase flow countercurrent fluidized bed solid holdup

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