Numerical study of the effect of the inlet gas distributor on the bubble distribution in a bubbling fluidized bed

Xing, Xuteng; Zhang, Chao; Jiang, Bin; Sun, Yong; Chen, Hou; Briens, Cédric

doi:10.1016/j.cherd.2021.10.021

Cited by 10 publications

(4 citation statements)

References 29 publications

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“…Adding a baffle just above the stripper increases the time agglomerates spend above the stripper, thus reducing stripper shed fouling . Preliminary CFD simulations suggest that a ring baffle would enhance solid dispersion above the baffle and reduce it below the baffle …”

Section: Reactormentioning

confidence: 99%

“…60 Fortunately, axial and radial profiles of the phase holdups and velocities do not appear to be very sensitive to changes in gas and particle properties: similar results were obtained with coke and FCC catalyst in experimental studies, 61 and, in CFD simulations, with coke and sand particles using either air at ambient conditions or steam at coker conditions. 62 Spray jets are usually simulated with gas jets, 18,20,63 but this assumes nearly instantaneous vaporization.…”

Section: Alternative Feedstocksmentioning

confidence: 99%

“…224 Preliminary CFD simulations suggest that a ring baffle would enhance solid dispersion above the baffle and reduce it below the baffle. 62 Rapid dispersion of injected solids is also essential to industrial fluidization processes ranging from polyethylene reactors 97,225 to biomass combustors, 226,227 gasification, 228 and pyrolysis 228 reactors. Because polymerization reactions are exothermic, highly reactive catalyst or prepolymer particles must be quickly dispersed to prevent the formation of hot spots that would lead to agglomerate formation.…”

Section: Alternative Feedstocksmentioning

confidence: 99%

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Review of Research Related to Fluid Cokers

Briens

McMillan

2021

Energy Fuels

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Fluid coking is a thermal conversion process that uses a conventional two-vessel circulating fluidized bed to convert heavy hydrocarbon feeds to lighter products. The technology was developed in the 1950s and since then has been used commercially around the world to upgrade heavy oils from various sources. Research work has been summarized related to all aspects of the fluid coking process, including reaction fundamentals, bed hydrodynamics, liquid distribution and jet–bed interaction, mixing of solid particles and agglomerates, mixing of vapors, control of the particle size, cleaning of the vapor stream in the scrubber, cleaning of the cold coke in the stripper, process monitoring, coke transfer lines, and the burner. The fluid coking process involves complex interactions between fluidized bed hydrodynamics, liquid feed injection, and reaction kinetics, and research tools that can take into account all of these interacting variables are requited to test methods to optimize the process. Fluid cokers can process many different types of feeds, and future applications may include blending and co-processing a variety of feedstocks ranging from waste plastics, pyrolytic bio-oil, and off-spec vegetable oils with heavy oil. The findings from this summary are also relevant for other applications that inject liquid into fluidized beds, such as the fluid catalytic cracking process, olefin polymerization cooled by liquid injection, granulators, and coaters.

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Section: Reactormentioning

confidence: 99%

Section: Alternative Feedstocksmentioning

confidence: 99%

Section: Alternative Feedstocksmentioning

confidence: 99%

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Review of Research Related to Fluid Cokers

Briens

McMillan

2021

Energy Fuels

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“…Gas distributor is one of the most important structures in towers and reactors to improve the initial distribution of the incoming gas, and its design and optimization have attracted extensive research [7][8][9][10]. Industrially, the gas distributors have tubular type, perforated plate type, tangential circulation type, fractal type and double-row vane type, etc [11].…”

Section: Introductionmentioning

confidence: 99%

Structural Improvement and Numerical Simulation of a Perforated Distributor in an Adsorption Tower

Hao,

Zhang,

et al. 2024

Chem Eng & Technol

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A “closed” perforated plate distributor was proposed to improve the gas distribution in an industrial adsorption tower. Compared with the industrial perforated plate distributor, the designed distributor restricts the space for the disordered movement of gas under the perforated plate. The new distributor effectively converts the gas from the initial axial flow on the inlet section to the axial flow on the tower section to improve the gas uniformity. In addition, the gas velocity at the edge of the inlet cross section of the adsorbent bed is increased by opening holes on the bottom plate. The uniformity of gas distribution is further improved. The simulation method in this study and the distribution performance of the “closed” perforated plate distributor have been verified by experiments.

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