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A new method for identifying flow pattern of spouted fluidized bed by coupling Hilbert-Huang transform characteristics of differential pressure signals in different zones

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Particuology 2024年第6期89卷 67-78页

作者： Yongzhi Mei Yang Wang Lihui Zhang Feng Duan School of Energy and Environment Anhui University of TechnologyMaanshan243002China Wuhu Technology and Innovation Research Institute Wuhu241000China Wuhu Cigarette Factory of China Tobacco Anhui Industrial Co. Ldt.Wuhu241002China

On a cold spouted fluidized bed,this study compares the characteristic differences in intrinsic mode function(IMF)energy and Hilbert–Huang spectrum between the spout zone and annulus zone under different combinations of spouted gas and fluidized gas flow rates for five typical flow *** energy distribution characteristics under different flow patterns are also *** Hilbert–Huang spectrum and IMF energy of pressure difference signals exhibit distinct variations in different zones as the flow pattern ***,there exists a correlation between the energy in the middle-frequency range and the flow *** the K-means algorithm,the middle-frequency range energy of IMFs in the spout zone and annulus zone is subjected to clustering analysis,leading to the identification of partition boundaries for each flow *** on this,a flow pattern identification method of spouted fluidized bed coupled with middle-frequency range energy in spout zone and annulus zone is proposed,which has very high identification accuracy.

关键词： spouted fluidized bed Flow pattern Zoning signal Flow pattern transition Hilbert-Huang transform

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CFD-DEM-VDGM method for simulation of particle fluidization behavior in multi-ring inclined-hole spouted fluidized bed

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Particuology 2021年第4期19卷 112-126页

作者： Meng Chen Zhao Chen Ming Gong Yaping Tang Malin Liu Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China School of Chemical Engineering Northwest UniversityXi’an 710069China

The simulation of particle fluidization behavior in a complex geometry with a large number of particles is challenging owing to the complexity of unstructured computational grids and high computational *** this study,a virtual dual-grid model(VDGM)is proposed to calculate the solid volume fraction in unstructured grids and speed up the *** VDGM is coupled with a computational fluid dynamics-discrete element method model to simulate particle fluidization behavior in a multi-ring inclined-hole spouted fluidized bed with 4.2 million particles under a high temperature of 1423 K.A computational fluid dynamics-discrete element method-virtual dual-grid model(CFD-DEM-VDGM)coupling model is implemented based on commercial software Fluent and *** time step settings in Fluent and EDEM and the pattern of particle data transfer in Fluent are improved to speed up the *** is discovered that the VDGM can calculate the solid volume fraction in unstructured grids of complex geometry and speed up the calculation *** calculation speed increased by more than 10 times compared with that of the segmentation sampling *** new pattern of particle data transfer in Fluent can reduce data transfer time by more than 90%.The fluidization behavior of 4.2 million high-density particles in the multi-ring inclined-hole spouted fluidized bed is obtained and analyzed in *** CFD-DEM-VDGM coupling method is validated for the bed expansion height and spouting cycle time in a spouted fluidized bed via experimental results.

关键词： Virtual dual-grid model CFD-DEM-VDGM spouted fluidized bed Unstructured grids Particle fluidization

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Analysis of Gas-Solid Flow Characteristics in a spouted fluidized bed Dryer by Means of Computational Particle Fluid Dynamics

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Fluid Dynamics & Materials Processing 2020年第4期16卷 813-826页

作者： Hongming Zhou Haozheng Gao Zheng Fang Jiangxin Yang Mingge Wu College of Mechanical and Electrical Engineering Wenzhou UniversityWenzhou325035China Zhejiang Canaan Technology Co. Ltd.Wenzhou325000China School of Mechanical Engineering Zhejiang UniversityHangzhou310027China

In order to grasp the particle flow characteristics and energy consumption of industrial fluidized spouted beds,we conduct numerical simulations on the basis of a Computational Particle Fluid Dynamics(CPFD)*** particular,the traction model of Wen-Yu-Ergun is used and different inlet conditions are *** a low-speed fluidizing gas,the flow state of the particles is better and the amount of particles accumulated at the bottom of the bed wall becomes *** the same air intake,the energy loss of a circular nozzle is larger than that of a square nozzle.

关键词： spouted fluidized bed CPFD flow characteristics numerical simulation

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