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1. Circulating turbulent fluidized bed regime on flow regime diagram

Author:
Boonprasop, Sutthichai; Chalermsinsuwan, Benjapon; Piumsomboon, Pornpote
Source:
Powder technology 2019 v.350 pp. 146-153
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; mixing; polymethylmethacrylate; powders;     Show all 4 Subjects
Abstract:
... Circulating turbulent fluidized bed (CTFB) regime was recently found under a low superficial gas velocity (Ug) system and contained the advantages of both a conventional turbulent fluidized bed, with an excellent mixing property between the gas and solid phases due to the high solid volume fraction (SVF), and a fast fluidized bed (FFB) or circulating fluidized bed (CFB) regime, which could be empl ...
DOI:
10.1016/j.powtec.2019.03.047

2. Influence of standing wave characteristics on hydrodynamic behaviours in sound-assisted fluidization of Geldart group A powder

Author:
Cherntongchai, Parimanan; Chaiwattana, Sattawat; Leruk, Rattanaporn; Panyaruean, Jutarat; Sriboonnak, Sornsiri
Source:
Powder technology 2019 v.350 pp. 123-133
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; equations; hydrodynamics; powders;     Show all 4 Subjects
Abstract:
... This study aimed to investigate the hydrodynamic behaviours of sound-assisted fluidization of Geldart group A powders under the effects of standing wave characteristics resulting from varying sound wave properties. The sound wave properties used in this were a sound frequency ranging from 0 to 500 Hz at a fixed sound pressure level of 80 dB, and the hydrodynamic behaviours observed included the to ...
DOI:
10.1016/j.powtec.2019.01.031

3. Mixing and segregation behaviors of a binary mixture in a pulsating fluidized bed

Author:
Lim, Leonard Jing Jie; Lim, Eldin Wee Chuan
Source:
Powder technology 2019 v.345 pp. 311-328
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; bubbles; mixing; powders;     Show all 4 Subjects
Abstract:
... The mixing and segregation behaviors of a binary mixture in a pulsating fluidized bed were investigated computationally in this study. A square-wave pulsating flow was applied with different mean inlet superficial velocities, pulsation amplitudes and pulsation frequencies. An increase in mean velocity increased the formation of bubbles and promoted mixing of the flotsam and jetsam in the fluidized ...
DOI:
10.1016/j.powtec.2019.01.026

4. Impacts of solid stress model on MP-PIC simulation of a CFB riser with EMMS drag

Author:
Kadyrov, Tagir; Li, Fei; Wang, Wei
Source:
Powder technology 2019 v.354 pp. 517-528
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; energy; interphase; models; powders;     Show all 5 Subjects
Abstract:
... The cluster-based EMMS (energy minimization multi-scale) drag model in combination with MP-PIC (multi-phase particle in cell) method can successfully simulate the fluidization behavior in CFBs (circulating fluidized beds). The solid normal stress model is very important to MP-PIC simulations, but still lacks thoroughly investigation, especially in CFB riser simulation. In this work, the effects of ...
DOI:
10.1016/j.powtec.2019.06.018

5. Electrostatic Distribution in the Riser of the Multizone Circulating Fluidized Bed for Polypropylene

Author:
Lou, Zhedong; Ge, Shiyi; Yang, Yao; Huang, Zhengliang; Sun, Jingyuan; Wang, Jingdai; Yang, Yongrong; Xie, Lei; Su, Hongye; Gao, Yunzhong
Source:
Industrial & engineering chemistry process design and development 2019 v.58 no.27 pp. 12301-12311
ISSN:
1520-5045
Subject:
fluidized beds,   etc   ; chemistry; polypropylenes; process design;     Show all 4 Subjects
Abstract:
... This work investigates the electrostatic distribution in the riser of a multizone circulation fluidized bed for polypropylene by various electrostatic measurements. Results show all measured electrostatic parameters have a strong dependence on flow patterns with increasing bed height. They remain constant in dense-phase pneumatic transportation, while they decrease in fast fluidization. However, t ...
DOI:
10.1021/acs.iecr.9b00592

6. 3D CFD simulation of gas-solids hydrodynamics and bubbles behaviors in empty and packed bubbling fluidized beds

Author:
Zhao, Guojing; Shi, Xiaogang; Wu, Yingya; Wang, Min; Zhang, Mengxuan; Gao, Jinsen; Lan, Xingying
Source:
Powder technology 2019 v.351 pp. 1-15
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; bubbles; hydrodynamics; models; powders;     Show all 5 Subjects
Abstract:
... Bubbling fluidized bed is extensively used in petrochemical and other process industries. The performance of the bubbling fluidized bed can be improved through the placement of various internals, among which structured packing is proposed to be a promising type of internal. To address the advantage of such packing over the bubbling fluidized bed without any internals, three-dimensional Computation ...
DOI:
10.1016/j.powtec.2019.04.003

7. Two- and three-dimensional hydrodynamic modeling of a pseudo-2D turbulent fluidized bed with Geldart B particle

Author:
Chang, Jian; Wu, Zejun; Wang, Xin; Liu, Wenyi
Source:
Powder technology 2019 v.351 pp. 159-168
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; hydrodynamics; hydrologic models; powders; prediction;     Show all 5 Subjects
Abstract:
... This study presents a comprehensive comparision between 2D and 3D hydrodynamic modeling of a pseudo-2D turbulent fluidized bed with Geldart B particle. Based on the Euler-Euler approach and the EMMS-based drag model, 2D/3D CFD models are established, their sensitivities to the restitution coefficient and the specularity coefficient are analyzed, and the 2D/3D hydrodynamic simulations are performed ...
DOI:
10.1016/j.powtec.2019.04.028

8. Identification of Mesoscale Flow in a Bubbling and Turbulent Gas–Solid Fluidized Bed

Author:
Niu, Li; Huang, Yahang; Chu, Zhimin; Cai, Min; Liu, Mengxi
Source:
Industrial & engineering chemistry process design and development 2019 v.58 no.19 pp. 8456-8471
ISSN:
1520-5045
Subject:
fluidized beds,   etc   ; bubbles; cold; hydrodynamics; turbulent flow;     Show all 5 Subjects
Abstract:
... Based on the moment consistency principle, the bubble threshold was determined by using the traversing method. A novel approach was proposed to identify bubbles and agglomerates from transient signals registered in a cold mode fluidized bed dealing with different particles. Bubble and agglomerate hydrodynamics including volume fraction, solid holdup, immigration velocity, and frequency were invest ...
DOI:
10.1021/acs.iecr.9b01077

9. 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 2019
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

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

Author:
Sang, Long; Nan, Tian; Jaberi, Amin; Zhu, Jesse
Source:
Powder technology 2019
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

11. CFD simulation of particle residence time distribution in industrial scale horizontal fluidized bed

Author:
Chen, K.; Bachmann, P.; Bück, A.; Jacob, M.; Tsotsas, E.
Source:
Powder technology 2019 v.345 pp. 129-139
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; diffusivity; dispersibility; models; powders;     Show all 5 Subjects
Abstract:
... This work investigates the applicability of two conceptually different methods for simulation of particle residence time distributions (RTDs): the species method and the multi-solid method. Both are Eulerian methods; their key difference is found in the specification of the macroscopic particle dispersion coefficient and its relation to microscale particle diffusivity. The intricate interrelation ...
DOI:
10.1016/j.powtec.2018.12.086

12. Comprehensive assessment of the accuracy of CFD-DEM simulations of bubbling fluidized beds

Author:
Liu, Daoyin; van Wachem, Berend
Source:
Powder technology 2019 v.343 pp. 145-158
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; models; powders; prediction; temperature;     Show all 5 Subjects
Abstract:
... The present study aims to validate CFD–DEM (Discrete Element Method) simulations of bubbling fluidized beds comprehensively, based on the small scale “challenge” problem recently released by NETL (https://mfix.netl.doe.gov/). Both the averaged and fluctuated values of an extensive list of properties are evaluated, including the pressure drop, the bubble size and rise velocity, and the particle vel ...
DOI:
10.1016/j.powtec.2018.11.025

13. Energy budget analysis of a dense gas-particle flow inside a fluidized bed

Author:
Haghgoo, Mohammad Reza; Bergstrom, Donald J.; Spiteri, Raymond J.
Source:
Powder technology 2018 v.340 pp. 154-162
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; energy; powders;     Show all 3 Subjects
Abstract:
... Deeper insight into the complex dynamics of dense gas-particle flows can be gained from the investigation of the energy cascade of the particulate phase. To this end, an in-depth systematic study is performed that uses a particle energy budget analysis to examine the dynamics of a three-dimensional bubbling bed. The budget analysis helps not only to quantify the relative importance of various term ...
DOI:
10.1016/j.powtec.2018.09.013

14. The exit impact on segregation of binary particles in the CFB system

Author:
Zhang, Yi; Zhang, Man; Yao, Xuan; Lyu, Junfu; Yang, Hairui
Source:
Powder technology 2018 v.339 pp. 930-938
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; mixing; powders;     Show all 3 Subjects
Abstract:
... Segregation exists extensively in the circulating fluidized bed (CFB) system, with solid particles of different sizes and densities. This paper studied the segregation of binary particles in a CFB system. Experimental results showed that segregation in the riser became weaker with increasing fluidizing gas velocity, ug, and solid circulating rate, Gs. In the case of high ug (6.0 m/s) and high Gs, ...
DOI:
10.1016/j.powtec.2018.08.070

15. Assessment of a bubble-based bi-disperse drag model for the simulation of a bubbling fluidized bed with a binary mixture

Author:
Wang, Shuai; Zhang, Kai; Xu, Shaodong; Yang, Xuesong
Source:
Powder technology 2018 v.338 pp. 280-288
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; mixing; models; powders;     Show all 4 Subjects
Abstract:
... In the simulation of a bubbling fluidized bed, it is necessary to consider the bubble effect on interphase drag force. In this work, the bubble-based drag model is extended to a binary mixture system. A bi-disperse gas-solid drag model considering the bubble effect is developed and implemented into the multi-fluid model. Three simulations of a bubbling fluidized bed with a binary mixture are carri ...
DOI:
10.1016/j.powtec.2018.06.031

16. Novel production method of tracer particles for residence time measurements in gas-solid processes

Author:
Pietsch, Swantje; Kieckhefen, Paul; Müller, Michael; Schönherr, Michael; Kleine Jäger, Frank; Heinrich, Stefan
Source:
Powder technology 2018 v.338 pp. 1-6
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; coatings; magnetism; powders;     Show all 4 Subjects
Abstract:
... In order to measure the residence time distribution (RTD) in continuous gas-solid processes tracer particles are used. In this contribution, a novel production concept for magnetizable particles has been developed and optimized. The process includes coating of a fraction of the investigated bed material with a magnetizable paint in a laboratory spouted bed. The coated particles fulfill the require ...
DOI:
10.1016/j.powtec.2018.06.040

17. Analysis of Solids Flow Rate through Nonmechanical L-Valve in an Industrial-Scale Circulating Fluidized Bed Using Group B Particles

Author:
Monazam, Esmail R.; Breault, Ronald W.; Shadle, Lawrence J.; Weber, Justin M.
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.33 pp. 11439-11451
ISSN:
1520-5045
Subject:
fluidized beds,   etc   ; aeration; models; powders;     Show all 4 Subjects
Abstract:
... A series of statistically designed experiments were conducted using two different Geldart Group B particles in a 0.3 m diameter circulating fluidized bed (CFB) cold model to evaluate the nonmechanical L-valve for controlling the solids flow rate. The objective of this study was to investigate the effects of standpipe aeration, L-valve aeration, solids inventory, and superficial gas velocity throug ...
DOI:
10.1021/acs.iecr.8b01051

18. Flow regimes in gas-liquid-solid mini-fluidized beds with single gas orifice

Author:
Li, Yanjun; Liu, Mingyan; Li, Xiangnan
Source:
Powder technology 2018 v.333 pp. 293-303
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; bubbles; liquids; powders;     Show all 4 Subjects
Abstract:
... Flow regimes and their transitions in the gas-liquid-solid mini-fluidized beds (MFBs) with single gas orifice were studied experimentally in this paper. The diameter of the fluidized beds varied from 3 mm to 5 mm and the vertical column height was 50 mm. The ranges of superficial gas velocity and liquid velocity were 1.96 × 10−4–4.73 × 10−3 m/s and 5 × 10−6–4.2 × 10−2 m/s, respectively. The solid ...
DOI:
10.1016/j.powtec.2018.04.029

19. Effect of primary air maldistribution due to nozzle wear on CFBC performance

Author:
Omer, Adlan; Weng, Martin
Source:
Fuel processing technology 2018 v.173 pp. 191-196
ISSN:
0378-3820
Subject:
fluidized beds,   etc   ; air; combustion; nozzles;     Show all 4 Subjects
Abstract:
... As in any fluidized bed application, the nozzle grid of a CFBC riser has the task of supplying fluidization/primary combustion air to the combustion chamber with a uniform distribution and at the same time retaining the coarse ash to form a dense bed at the riser bottom. A typical issue in large scale CFBs is a maldistribution of primary air caused by either excessive nozzle wear in certain grid r ...
DOI:
10.1016/j.fuproc.2017.12.008

20. Parametric study for MP-PIC simulation of bubbling fluidized beds with Geldart A particles

Author:
Feng, Meiyan; Li, Fei; Wang, Wei; Li, Jinghai
Source:
Powder technology 2018 v.328 pp. 215-226
ISSN:
0032-5910
Subject:
fluidized beds,   etc   ; energy; models; powders;     Show all 4 Subjects
Abstract:
... This is a parametric study for multi-phase particle in cell (MP-PIC) simulation of bubbling fluidized beds with Geldart A particles using the open source MFIX program. The main parameters have been studied including drag models, grid resolution and number of particles per parcel (PPP). And the calculated axial/radial solid distribution and bed height are compared with the experimental data for val ...
DOI:
10.1016/j.powtec.2018.01.024