Particle mixing and separation performance of gas-solid separation fluidized beds containing binary mixtures

Lv, Bo; Z, Luo; Zhang, Bo; Qin, Xingzong

doi:10.1016/j.fuel.2018.04.037

Cited by 22 publications

(4 citation statements)

References 15 publications

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“…Fluidized beds have been very popular in many chemical industries because of the advantage of excellent heat and mass transfer efficiency [1][2][3]. In many industrial processes, for example, clean utilization of coal [4] and gasification of biomass [5], the treatment of two or more types of particles differing in density and/or diameter is needed. The lateral mixing of dissimilar particles is crucial to the distribution of volatiles over the cross section and its importance has been clarified by many researchers [6,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Quantification of the Lateral Mixing of Binary Solids in Bubbling Fluidized Beds

Huang

Liu

et al. 2021

Energies

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A novel experimental method for the lateral mixing of binary solids in bubbling fluidized beds was developed based on the capacitance probe technique. The evolutions of local mixing ratios in a fluidized bed which can be assumed as one mixing cell were analyzed in detail. The solids mixing within one mixing cell was resolved and the effect of convection and diffusion mechanism on lateral mixing was evaluated individually. The results show that at lower part of the fluidized bed, convection plays a more important role in the mixing process near the wall; meanwhile, diffusion is very important for the mixing around the center line. This is opposite with that at the higher part. A lateral micro dispersion coefficient was proposed to characterize the lateral mixing within the mixing cell and the value is generally between 0.005 and 0.025 m/s. A new mixing index was proposed to evaluate the lateral mixing quality of binary solids. It was found that at the lower part of the fluidized bed, the best mixing is acquired at the half radius, whereas mixing at the center line is the worst. At the higher part, solid mixing is better when increasing the distance from the wall. The influences of gas velocity and static bed on the lateral mixing were also discussed from a microscopic perspective.

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Section: Introductionmentioning

confidence: 99%

Experimental Quantification of the Lateral Mixing of Binary Solids in Bubbling Fluidized Beds

Huang

Liu

et al. 2021

Energies

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“…The amount of inert material used in all the experiments was set at 4 kg, i.e., the same value used by Lv et al [24]. A standard test was carried out on a perforated plate distributor using sand with an average particle size of 325 µm and a 5 wt% ratio of rice husk mass.…”

Section: Experimental Procedures For Cold Fluidization Experimentsmentioning

confidence: 99%

“…Tests were carried out to develop a bed pressure drop profile as a function of the bed fluidizing gas velocity. Thus, the minimum fluidization speed was obtained using a graphical method, as in other works such as Pécora et al [26] and Lv et al [24]. However, it is worth mentioning that although these works have defined U mf only through a fluidization process, there are works such as those performed by Rao and Bheemarasetti [27] and Qiaoqun et al [13] who define this speed by performing a defluidization of particulate material.…”

Section: Influence Of the Type Of Distributor On Cold Fluidizationmentioning

confidence: 99%

Investigating the Influence of Distributor Type, Particle Size and Rice Husk Percentage on Fluidized Beds through Cold Fluidization Experiments

Balestieri,

Luna,

Ávila

2023

Energies

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This work studies a fluidization system through cold experiments by using a mixture of rice husk and sand to investigate three parameters: type of bed distributor (perforated plate and plate with Tuyere-type injectors), sand granulometry (mean diameters of 324 µm and 647 µm) and rice husk mass ratio (from 1% to 10% of rice husk). The results reveal that the perforated distributor plate achieved a lower minimum fluidization velocity. However, the plate with Tuyere injectors generated better mixing, thus reducing possible stagnation points. An increase in the mean diameter of the sand raises the minimum fluidization velocity but also facilitates the formation of preferential channels. As for the rice husk mass ratio, values of over 5% cause stagnation points and preferential channels. It was also found that the relation between minimum fluidization velocity and rice husk ratio follows an exponential behavior, and an equation was developed to better describe their relation.

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“…Fluidized beds are the main reactor in a large number of chemical engineering industries including power plants, biomass gasification, catalytic cracking due to many advantages such as excellent heat and mass transfer, and fuel flexibility (Shao et al,; Loha et al, and Pei et al). In many fluidization processes, particles with different densities and/or sizes are used for various purposes (Lv et al). The lateral mixing between dissimilar particles in fluidized beds is very important for the design and operation of the reactor.…”

Section: Introductionmentioning

confidence: 99%

Experimental Quantification of the Radial Mixing of Binary Mixtures in Annular Fluidized Beds Using the Capacitance Probe Method

Huang

et al. 2022

Ind. Eng. Chem. Res.

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A novel measurement system for radial particle mixing in annular fluidized beds is designed on the basis of the capacitance probe method. Mixing parameters at different radial positions are acquired. The effects of the convection/diffusion mechanism on radial mixing are analyzed individually. It is found that the governing mechanism of mixing at the axial line is convection; meanwhile, diffusion is the governing mechanism of mixing near the wall. The effect of convection on radial mixing at the upper part is more important than that at the lower part. The radial dispersion coefficient ranges from 0.006 to 0.072 m 2 /s. At the upper part, the radial dispersion coefficient at half-radius is between 0.016 and 0.072 m 2 /s and that near the wall is 0.006 and 0.028 m 2 /s, which is four times and twice that at the same radial position and at the lower part, respectively. The radial dispersion coefficient is about 1.5 times that in twodimensional fluidized beds.

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Particle mixing and separation performance of gas-solid separation fluidized beds containing binary mixtures

Cited by 22 publications

References 15 publications

Experimental Quantification of the Lateral Mixing of Binary Solids in Bubbling Fluidized Beds

Experimental Quantification of the Lateral Mixing of Binary Solids in Bubbling Fluidized Beds

Investigating the Influence of Distributor Type, Particle Size and Rice Husk Percentage on Fluidized Beds through Cold Fluidization Experiments

Experimental Quantification of the Radial Mixing of Binary Mixtures in Annular Fluidized Beds Using the Capacitance Probe Method

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