Experimental study on solid circulation in a multiple jet fluidized bed

Agarwal, G. S.; Lattimer, Brian Y.; Ekkad, Srinath V.; Vandsburger, Uri

doi:10.1002/aic.13703

Cited by 19 publications

(2 citation statements)

References 56 publications

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“…In these processes, high-speed jets are usually used to mix and react with the two-phase fluid in the equipment, so as to improve mass transfer, heat transfer, and reaction efficiency. [1][2][3][4][5] As a high efficiency mixing and reaction equipment, riser reactors have been widely used for multiphase reactions, [6] and high-speed jets is very commonly used in riser reactors in many industrial processes. To have a deep understanding of the interaction mechanism between the multiphase flow and the feed injection in the riser reactor is thus very important.…”

Section: Introductionmentioning

confidence: 99%

Development and application of counter‐current feed injection technology in riser reactors

Yan

Fan

et al. 2022

Can J Chem Eng

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A counter‐current feed injection scheme is proposed to improve the jet‐solid mixing and reaction in the injection zone of riser reactors. By analyzing the characteristics of the coupled flow field, combined with experiments and numerical simulation, the advantages of the new injection technology are investigated. Experimental results show that the particles distribute more uniformly when the feed is injected downward, which is good for the mixing and reaction of the jet with particles. By simulating the reaction in an industrial fluid catalytic cracking (FCC) riser, it is found that the yields of gasoline and liquefied petroleum gas (LPG) are increased significantly by using the counter‐current feed injection structure. Simultaneously, the formation of coke is reduced considerably. On this basis, a riser‐fluidized bed coupled reactor was designed by adopting the proposed counter‐current feed injection technology to solve the coking problem in an industrial pyridine synthesis system. Results from the side‐stream sampling show that the carbon content of the catalyst reduces significantly, indicating a decrease in coke formation. By now, the improved industrial reactor has been in stable operation for 2 years, showing good reliability.

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Section: Introductionmentioning

confidence: 99%

Development and application of counter‐current feed injection technology in riser reactors

Yan

Fan

et al. 2022

Can J Chem Eng

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“…The standard noninvasive measurement techniques used for the determination of particle trajectories and velocities are as follows: pitot tube, 18 Laser-Doppler anemometry, 19 video technique, 20 radioactive particle tracking, 21 and particle image velocimetry. 22 Nevertheless, techniques based on an optical-fiber probe are also promising for this purpose. [23][24][25][26][27][28][29] In recent years, with the development of high performance computers, researchers have used numerical methods to study the flow behavior of fluidized beds.…”

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confidence: 99%

Effect of slip boundary conditions on the simulation of microparticle velocity fields in a conical fluidized bed

2013

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The hydrodynamic performance of micrometric TiO 2 particles has been experimentally studied in a conical fluidized bed and the results compared with numerical simulations. Local solid velocities in the bed have been measured by means of an optical fiber technique under different operating conditions of particle loading and air velocity. The radial profiles of axial solid velocities have been simulated to assess the sensitivity of grid size, and different drag models, namely, those by Syamlal and O'Brien, Ahmadi and Ma, Arastoopour et al., and Gidaspow, for no-slip, partial-slip, and free-slip boundary conditions (BCs). The different drag models record almost similar results, but those provided by the Gidaspow and Ahmadi-Ma models, together with free-slip BCs, are in somewhat better agreement with the experimental data for conical fluidized beds with smooth walls. V C 2013 American Institute of Chemical Engineers AIChE J, 59: [4502][4503][4504][4505][4506][4507][4508][4509][4510][4511][4512][4513][4514][4515][4516][4517][4518] 2013 Keywords: conical fluidized bed, solid velocity, slip boundary conditions, numerical simulation, drag models IntroductionFluidized and spouted beds are extensively used for various industrial applications in pharmaceuticals, 1,2 drying, 3,4 food processing, 5 combustion, 6,7 pyrolysis, and catalytic polymerization. 8,9 A conical fluidized bed has the characteristics of both fluidized and spouted beds, being, therefore, suitable for handling agglomerating or sticky powders. This is particularly the case for the fluidization of fine particles with a wide size distribution corresponding to different groups of Geldart's classification. 10,11 Although many studies have been reported in the literature involving fluidized beds, [12][13][14][15] certain details of the hydrodynamic performance of conical fluidized beds are not fully understood, which is partially due to the few experimental data on the hydrodynamics of these beds. 16,17 Accordingly, the design and scaling-up of conical fluidized beds is not straightforward, given that bed geometry, the ratio of inlet diameter to bed height and operating conditions highly influence gas-solid flow regime. Furthermore, hydrodynamic parameters such as pressure drop, solid volume fraction, and velocity significantly affect the performance of the conical bed. Optimizing the performance of conical fluidized beds requires a thorough understanding of the mixing characteristics and interactions between the gas and solid phases. The standard noninvasive measurement techniques used for the determination of particle trajectories and velocities are as follows: pitot tube, 18 Laser-Doppler anemometry, 19 video technique, 20 radioactive particle tracking, 21 and particle image velocimetry. 22 Nevertheless, techniques based on an optical-fiber probe are also promising for this purpose. [23][24][25][26][27][28][29] In recent years, with the development of high performance computers, researchers have used numerical methods to study the flow behavior of fluidized...

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Jets in Fluidized Beds

Briens

McMillan

2020

Essentials of Fluidization Technology

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Experimental study on solid circulation in a multiple jet fluidized bed

Cited by 19 publications

References 56 publications

Development and application of counter‐current feed injection technology in riser reactors

Development and application of counter‐current feed injection technology in riser reactors

Effect of slip boundary conditions on the simulation of microparticle velocity fields in a conical fluidized bed

Jets in Fluidized Beds

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