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1. Fine generation ratio of iron ore in the cyclone of a gas–solid circulating fluidized bed

Author:
Sung, Woo Chang; Kim, Jun Young; Ko, Chang Kuk; Lee, Dong Hyun
Source:
Powder technology 2020 v.363 pp. 256-264
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; catalysts; iron;     Show all 3 Subjects
Abstract:
... The generation of fines by attrition in fluidized bed reactors can cause problems. Thus, the objective of this study was to examine the amount of fines generated in the cyclone not only by attrition, but also by detachment of fine attached to surface according to time. Using a circulating fluidized bed (0.076 m ID × 3.7 m height), variables including cyclone inlet velocity (20.6–30.9 m/s), solid l ...
DOI:
10.1016/j.powtec.2019.12.042

2. CFD-DEM study of effects of particle density on spout deflection behavior in a spout fluidized bed

Author:
Yue, Yuanhe; Wang, Tianyu; Shen, Yansong
Source:
Powder technology 2020 v.366 pp. 736-746
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; hydrodynamics; product quality;     Show all 3 Subjects
Abstract:
... Spout deflection is a typical instability phenomenon in spout fluidized beds and can greatly affect the homogeneity of the gas-solid system as well as product quality. However, few studies have been conducted to quantify the relation between the spout deflection and particle density. In this paper, the effects of particle density on the spout deflection under three scenarios are investigated, incl ...
DOI:
10.1016/j.powtec.2020.03.016

3. Investigating the bubble dynamics in fluidized bed by CFD-DEM

Author:
Mostafaei, Fatemeh; Golshan, Shahab; Zarghami, Reza; Gharebagh, Rahmat Sotudeh; Mostoufi, Navid
Source:
Powder technology 2020 v.366 pp. 938-948
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; bubbles; cameras; industry;     Show all 4 Subjects
Abstract:
... Fluidized beds are of great importance in various industries and presence of bubbles significantly influence their efficiency. In order to gain a more accurate vision on the dynamics of a single bubble in fluidized beds, formation, rising, and eruption of a single bubble in a rectangular fluidized bed were studied by CFD-DEM and validated by experimental data. Single bubble in a 2-D rectangular fl ...
DOI:
10.1016/j.powtec.2020.03.011

4. Spatial characteristics of fluidization and separation in a gas-solid dense-phase fluidized bed

Author:
Fu, Yanhong; Chen, Wei; Su, Ding; Lv, Bo; Luo, Zhenfu
Source:
Powder technology 2020 v.362 pp. 246-256
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; coal; standard deviation;     Show all 3 Subjects
Abstract:
... To study the fluidization characteristics and separation performance of a gas-solid dense-phase fluidized bed, bed space structure and force analyses of particles in the radial and axial zones are explored. The results indicate that the standard deviation and average bed density increases with increases in the static bed height. As the fluidization number is increased, the average bed density decr ...
DOI:
10.1016/j.powtec.2019.11.065

5. Evaluation of the effect of hydraulic shear intensity on coal-slime water flocculation in a gradient fluidized bed

Author:
Lin, Zhe; Sun, Xiaolu; Wang, Quanwu; Cao, Jinwen; Wang, Chuanzhen; Kuang, Yali
Source:
Powder technology 2020 v.360 pp. 392-397
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; flocculation; powders; turbidity;     Show all 4 Subjects
Abstract:
... Fluid shear plays a paramount role in flocculation. In present work, a fluidized bed flocculator with a decreasing fluid shear intensity in steps, called gradient fluidized bed (GFB) flocculator, was developed according to the self-preserving nature of floc size distribution and the flocculation kinetics. Then flocculation experiments were conducted to evaluate the performance of the GFB flocculat ...
DOI:
10.1016/j.powtec.2019.10.031

6. Heat transfer in a pulsed fluidized bed by using coupled CFD-DEM method

Author:
Zhang, Kai; Wang, Shuai; Li, Bowen; He, Yurong; Zhao, Yunhua
Source:
Powder technology 2020 v.367 pp. 497-505
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; convection; cooling; fluid mechanics;     Show all 4 Subjects
Abstract:
... Heat transfer behaviors in a pulsed fluidized bed are numerically investigated by means of a combined approach of computational fluid dynamics (CFD) and discrete element method (DEM). The effect of pulsation flow on bed heat transfer characteristics is evaluated. It is found that the pulsed gas flow leads to an intense oscillating flow behavior in the bed, enhancing the the cooling rate of hot par ...
DOI:
10.1016/j.powtec.2020.04.013

7. Impact of local fluidized bed hydrodynamics on the distribution of liquid sprayed into the bed

Author:
Li, Yuan; Careaga, Francisco Sanchez; Briens, Cedric; Berruti, Franco; McMillan, Jennifer
Source:
Powder technology 2020 v.367 pp. 326-335
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; fouling; gases; hydrodynamics; particles; velocity;     Show all 6 Subjects
Abstract:
... In industrial Fluid Coking™ processes, wet agglomerates formed with coke particles flowing down from the spray regions to the stripper section cause fouling of the stripper sheds, which is a major operating problem. The objective of this work was to determine how to reduce agglomeration by increasing the superficial gas velocity, modifying the gas distributor configuration, or adding internals suc ...
DOI:
10.1016/j.powtec.2020.03.012

8. Bench scale analysis of the physical attrition properties for copper-ferri-aluminate oxygen carriers during chemical looping combustion

Author:
Riley, Jarrett; Siriwardane, Ranjani; Poston, James
Source:
Powder technology 2020 v.366 pp. 891-905
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; combustion; microstructure; oxygen; power generation;     Show all 5 Subjects
Abstract:
... Abrasion and fragmentation related attrition has been deemed as one of the major design challenges for the development of oxygen carriers for chemical looping process concepts and their implementation. Since the technology seeks to replace conventional power generation, oxygen carrier lifetime is a critical parameter as it can impact the potential competitive nature for the implementation of the p ...
DOI:
10.1016/j.powtec.2020.02.067

9. Effect of elevated pressure on gas-solid flow characteristics in a circulating fluidized bed

Author:
Liu, Daoyin; Hu, Jinding; Song, Jialong; Liang, Cai; Xu, Chuanlong; Chen, Xiaoping
Source:
Powder technology 2020 v.366 pp. 470-476
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; chemical reactions; heat; mass transfer;     Show all 4 Subjects
Abstract:
... Pressurized circulating fluidized beds are applied in a range of applications because of intensified heat and mass transfer and chemical reaction. The gas density increases linearly with the pressure, which influences the gas-solid flow characteristics. In this work, the effects of operating pressure (0.1 MPa–0.6 MPa) on the distribution of particle volume fraction and gas-solid slip velocity in t ...
DOI:
10.1016/j.powtec.2020.02.046

10. Effects of flow behavior index and consistency coefficient on hydrodynamics of power-law fluids and particles in fluidized beds

Author:
Pang, Boxue; Wang, Shuyan; Chen, Weiqi; Hassan, Muhammad; Lu, Huilin
Source:
Powder technology 2020 v.366 pp. 249-260
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; deformation; hydrodynamics; liquids; models; viscosity;     Show all 6 Subjects
Abstract:
... Flow behaviors of particles and power-law fluids were numerically simulated by means of Euler-Euler model with kinetic theory of granular flow in liquid-solid fluidized beds, and effects of flow behavior index (n) and consistency coefficient (K) were studied. The simulation results were compared with the experimental measurements, and good agreements were achieved. The effective viscosity of the s ...
DOI:
10.1016/j.powtec.2020.01.061

11. Effects of particle type on the particle distribution in a two-pass circulating fluidized bed evaporator with baffle

Author:
Li, Na; Zhang, Yuqing; Jiang, Feng; Wang, Hongyu; Li, Xiulun
Source:
Powder technology 2020 v.366 pp. 1-11
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; fouling; heat transfer; physical phases;     Show all 4 Subjects
Abstract:
... To enhance heat transfer, as well as prevent and remove fouling, a two-pass circulating fluidized bed evaporator with baffle has been designed and built. The uniformity of particle distribution significantly influences the performance of evaporator. This paper mainly researches the influences of particle types on the particle distribution with a Charge Couple Device image measurement and acquisiti ...
DOI:
10.1016/j.powtec.2020.02.038

12. Self-tuning control of continuous fluidized bed drying of baker’s yeast pellets

Author:
Dürr, Robert; Seidel, Carsten; Neugebauer, Christoph; Bück, Andreas
Source:
Drying technology 2020 v.38 no.5-6 pp. 646-654
ISSN:
1532-2300
Subject:
fluidized beds,   etc   ; bakers yeast; drying; pellets; uncertainty;     Show all 5 Subjects
Abstract:
... Uncertainty in the kinetics of the second drying period represents the major challenge in continuous drying of particulate solids which can be overcome by adaptive feedback control. In this contribution, self-tuning control comprising online-state estimation and adaptive PI-control is considered to guarantee desired product moisture. Advantages of the approach over conventional PI-control are disc ...
DOI:
10.1080/07373937.2019.1662800

13. Flow past a single stationary sphere, 2. Regime mapping and effect of external disturbances

Author:
Tiwari, Shashank S.; Pal, Eshita; Bale, Shivkumar; Minocha, Nitin; Patwardhan, Ashwin W.; Nandakumar, Krishnaswamy; Joshi, Jyeshtharaj B.
Source:
Powder technology 2020 v.365 pp. 215-243
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; mixing; powders; turbulent flow;     Show all 4 Subjects
Abstract:
... This review presents a systematic analysis of the published literature on flow regime mapping and effects of external disturbances for flow past a single stationary sphere. Various experimental and numerical investigations have been performed over the past years on such flows over a wide range of Re. The first part of this review (Tiwari et al. [1]) explained the methodologies to carry out these i ...
DOI:
10.1016/j.powtec.2019.04.032

14. On the basic hydrodynamics of inverse liquid-solid circulating fluidized bed downer

Author:
Sang, Long; Nan, Tian; Jaberi, Amin; Zhu, Jesse
Source:
Powder technology 2020 v.365 pp. 74-82
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; hydrodynamics; liquids; pipes; powders;     Show all 5 Subjects
Abstract:
... A new type of fluidized bed called Inverse Liquid-Solid Circulating Fluidized Bed (ILSCFB) has been developed. The circulating fluidized bed consists of the downer with an inner diameter of 7.6 cm and the height of 5.4 m, upcomer with an inner diameter of 20 cm, separator, and connecting pipes between the downer to the storage column. The operation window has been demonstrated at different solids ...
DOI:
10.1016/j.powtec.2019.04.021

15. Stability Analysis of Gas–Solid Distribution through Nonidentical Parallel Paths

Author:
Zhang, Chenxi; Xu, Qi; Bourane, Abdennour; Ghrami, Musaed; Abba, Ibrahim; Wei, Fei
Source:
Industrial & engineering chemistry process design and development 2020 v.59 no.14 pp. 6707-6715
ISSN:
1520-5045
Subject:
fluidized beds,   etc   ; catalytic activity; catalytic cracking;     Show all 3 Subjects
Abstract:
... Gas–solid fluidized beds in parallel can share some common units yet couple different reactions without extra pressure drop. The bottleneck, however, in such a parallel system, especially with nonidentical paths, is to ensure the stability of desirable gas–solid distribution. After the nonidentity index is defined, a framework to detect the instability of gas–solid distribution through a nonidenti ...
DOI:
10.1021/acs.iecr.9b06581

16. Joint effects of liquid level and baffle height on the particle distribution and pressure drop in a vertical two-pass circulating fluidized bed evaporator with a baffle

Author:
Li, Na; Zhang, Yuqing; Jiang, Feng; Qi, Guopeng; Wang, Hongyu; Su, Rui; Zhang, Weiwei; Shi, Ning
Source:
Powder technology 2020 v.364 pp. 27-35
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; evaporation; fouling; heat transfer; liquids;     Show all 5 Subjects
Abstract:
... To enhance heat transfer, as well as prevent and remove fouling, a vertical two-pass circulating fluidized bed evaporator with a baffle has been designed and built. The uniformity of particle distribution in the evaporator significantly influences the performance of fouling preventing and removing. The joint effects of baffle height and liquid level in the evaporation chamber on the particle distr ...
DOI:
10.1016/j.powtec.2020.01.063

17. Numerical investigation of pulsed fluidized bed using CFD-DEM: Insights on the dynamics

Author:
Wuc, C.L.; de Oliveira, D.G.; Wu, C.L.; Nandakumar, K.
Source:
Powder technology 2020 v.363 pp. 745-756
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; fluid mechanics; temperature profiles;     Show all 3 Subjects
Abstract:
... Computational Fluid Dynamics and Discrete Element Method are used to study the dynamics of a pseudo-2D pulsed fluidized bed, consisting of Geldart B particles. The focus is on the response of the system to variations in the mean gas velocity, VM, and the amplitude of oscillations, VA, at an imposed frequency of 3.5 Hz. Distinctive flow patterns are mapped out based on observation of simulations, p ...
DOI:
10.1016/j.powtec.2020.01.016

18. Statistical analysis of monodispersed coarse particle motion in a gas-fluidized bed

Author:
Hou, Qinfu; Zhou, Zongyan; Curtis, Jennifer S.; Yu, Aibing
Source:
Powder technology 2020 v.363 pp. 107-111
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; equations; frequency distribution; normal distribution;     Show all 4 Subjects
Abstract:
... Continuum description of particle-fluid flows is of fundamental importance. In the past, various averaging methods were developed to derive local quantities directly from particle scale information. However, it is not clear if the long-sought resolution-independence of the local quantities exists. Here, using a discrete element method, a statistical analysis is conducted for a gas-solid fluidized ...
DOI:
10.1016/j.powtec.2020.01.027

19. Experimental and numerical investigations on the particle behaviours in a bubbling fluidized bed with binary solids

Author:
Wang, Tianyu; Tang, Tianqi; Gao, Qinghua; Yuan, Zigui; He, Yurong
Source:
Powder technology 2020 v.362 pp. 436-449
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; hydrodynamics; industry; models; periodicity; powders;     Show all 6 Subjects
Abstract:
... The hydrodynamics of binary particles in bubbling fluidized beds are of significance to a wide range of industries, and acceptable agreement has been found between experimental measurement and numerical calculation of the vertical velocity distribution of binary particles. Calculations using different drag models and restitution coefficients have been used to model a variety of superficial gas vel ...
DOI:
10.1016/j.powtec.2019.11.105

20. Investigation of a circulating turbulent fluidized bed with a fractal gas distributor by electrostatic-immune electrical capacitance tomography

Author:
Wang, Shengnan; Sun, Xianliang; Xu, Chuanlong; Bao, Jiatong; Peng, Ci; Tang, Zhiyong
Source:
Powder technology 2020 v.361 pp. 562-570
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; capacitance; cold; models; tomography;     Show all 5 Subjects
Abstract:
... In this paper, an electrostatic-immune AC-based electrical capacitance tomography (ECT) is developed to visualize the gas-solid flow inside the circulating turbulent fluidized bed (C-TFB) reactor. A fractal gas distributor based on fractal self-similarity theory is used to improve the particle distribution by re-distributing the intake gas. Experiments are carried out on a cold model of lab-scale ...
DOI:
10.1016/j.powtec.2019.11.077