Study on the critical amount of liquid for bed material agglomeration in a bubbling fluidized bed

Montes, Alejandro; Hamidi, Majid; Briens, Cédric; Berruti, Franco; Tran, Honghi; Xu, Chunbao

doi:10.1016/j.powtec.2015.07.017

Cited by 16 publications

(10 citation statements)

References 14 publications

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“…As Λ increases, the volume of the liquid bridge obviously increases, thus resulting in an increase in the maximum bed expansion ratio (the bed expansion ratio at U cf ). At a trapped-liquid regime (Figure b), the liquid bridge force is strong enough to maintain stable agglomeration . At this time, the agglomerates have a compact structure that maintains the interparticle distance close to zero.…”

Section: Resultsmentioning

confidence: 99%

“…At a trapped-liquid regime (Figure 6b), the liquid bridge force is strong enough to maintain stable agglomeration. 22 At this time, the agglomerates have a compact structure that maintains the interparticle distance close to zero. The bed expansion is realized mainly by the voids between agglomerates and the expansion of other freely flowing particles.…”

Section: Resultsmentioning

confidence: 99%

“…21 Montes et al used similar methods to obtain the critical liquid amount for the appearance of agglomerations. 22 There are some critical problems to be solved. A reliable method for determining the boundary between the free-liquid regime and trapped-liquid regime is required.…”

Section: Introductionmentioning

confidence: 99%

“…Mohagheghi et al classified the liquids as free liquid and trapped liquid and used a capacitance sensor to detect the minimum liquid amount that causes a change in cohesiveness of the particles . Montes et al used similar methods to obtain the critical liquid amount for the appearance of agglomerations . There are some critical problems to be solved.…”

Section: Introductionmentioning

confidence: 99%

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Distinguishing Liquid Transport Patterns during the Fluidization of Wet Particles with Bed Expansion Behaviors

Pan

Liu

2020

Ind. Eng. Chem. Res.

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The liquid transport pattern in a fluidized bed of wet particles influences the global fluidization dynamics. This paper proposed a method for distinguishing liquid transport patterns according to the bed expansion behaviors at incipient fluidization. The results show that the average bed expansion ratio increases first and then decreases with increasing ratio of liquid to solid (L/S ratio), corresponding to the free-liquid regime and trapped-liquid regime, respectively. The L/S ratio at the largest expansion ratio, Λc, is the critical value distinguishing both regimes. The critical L/S ratio increases with particle diameter while decreases with the liquid surface tension. The liquid viscosity has negligible impacts on the bed expansion and the critical L/S ratio. Finally, a regime map was drawn combining the bond number Bo and L/S ratio, and a correlation between Λc and Bo was fitted: Λc = −Bo/10,000 + 0.0111. This may help choose operating parameters according to the desired liquid transport pattern.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distinguishing Liquid Transport Patterns during the Fluidization of Wet Particles with Bed Expansion Behaviors

Pan

Liu

2020

Ind. Eng. Chem. Res.

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“…In most studies, bogging was not directly observed, but typical bed solids were subjected to conditions known to lead to bogging and higher powder cohesivity, such as increased temperatures for combustors or polyethylene reactors or increased wetness for applications in which liquid is injected in a fluidized bed . Another approach is to take bed samples at conditions near bogging and characterize their cohesivity; this was applied to a pilot-plant fluid coker . Finally, bogging can be identified from a significant degradation in either product quality or process performance …”

Section: Reactormentioning

confidence: 99%

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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A novel force balance model for predicting defluidization of ilmenite in a fluidized bed reactor

Zhang

Li²,

Zou³

et al. 2023

Chemical Engineering Journal

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Study on the critical amount of liquid for bed material agglomeration in a bubbling fluidized bed

Cited by 16 publications

References 14 publications

Distinguishing Liquid Transport Patterns during the Fluidization of Wet Particles with Bed Expansion Behaviors

Distinguishing Liquid Transport Patterns during the Fluidization of Wet Particles with Bed Expansion Behaviors

Review of Research Related to Fluid Cokers

A novel force balance model for predicting defluidization of ilmenite in a fluidized bed reactor

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