Investigation into flow and heat transfer characteristics of sparse particles in beam fluidized bed receiver

• Published in: Chemical engineering research & design Vol. 174; pp. 225 - 233
• Main Authors: Chen, Juhui, Gao, Haoming, Li, Dan, Shi, Xiao, Zhao, Chenxi, Han, Changliang, Yu, Guangbin
• Format: Journal Article
• Language: English
• Published: Rugby Elsevier Ltd 01.10.2021; Elsevier Science Ltd
• Subjects: Beam fluidized bed receiver; DO radiation model; DPM method; Fluidized bed reactors; Fluidized beds; Heat transfer; Heat transfer performance; High temperature; Independent variables; Mathematical models; Mixed medium; Simulation; Temperature distribution; Beam fluidized bed receiver; Heat transfer performance; DPM method; DO radiation model; Mixed medium
• ISSN: 0263-8762; 1744-3563
• DOI: 10.1016/j.cherd.2021.07.002

Simulation shows the relationship between particle absorption coefficient and particle volume fraction. It can be seen from the figure that the absorption coefficient of particles increases with the increase of the volume fraction of particles. When the particle concentration is high, the micro-sized particles will have the effect of local agglomeration. Therefore, we can know the influence of the aggregation of particles on the absorption effect of particles. [Display omitted] •The temperature distribution, flow and heat transfer process of sparse concentration particles are analyzed.•The distribution of high temperature particles and the endothermic effect of mixed medium are analyzed.•At lower concentrations, 70% of particles can effectively participate in cyclic heat transfer, which increased heat transfer.•The functional relation between particle absorption coefficient and volume fraction is obtained by polynomial fitting.•The fitting relation between the volume fraction of metal particles and the heat transfer coefficient of the mixed medium is obtained. In this paper, numerical simulation is carried out for the beam-type fluidized bed receiver. The mixture of air and inert particles is used as heat transfer medium in the simulation. Eulerian–Lagrange method and DO radiation model are used to describe the flow and heat transfer characteristics of gas and inert particles in fluidized bed receiver. At the same time, DPM method is used to consider the effect of particles on radiation field and the interaction between particles and flow field. Tracking particle wrapping and the temperature distribution, flow and heat transfer process of particles are analyzed. The particle temperature distribution is mainly concentrated in 550–800K, and 70% of the particles participate in effective heat transfer in terms of radial particle temperature and volume distribution. When the number of high temperature particles reaches 50%, the heat absorption capacity of mixed medium is optimal. At the same time, the fitting function with particle volume fraction as independent variable is obtained.