Correlation for predicting minimum fluidization velocity with different size distributions and bed inventories at elevated temperature in gas-solid fluidized bed

Korkerd, Krittin; Soanuch, Chaiwat; Zhou, Zongyan; Piumsomboon, Pornpote; Chalermsinsuwan, Benjapon

doi:10.1016/j.apt.2022.103483

Cited by 12 publications

(5 citation statements)

References 63 publications

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“…It is noteworthy that bed height has an effect on fluidization characteristics, including minimum fluidization velocity and gas holdup values. , In our study, we used the same mass of silica particles at different temperatures, resulting in a variation in packed bed height due to the temperature effect on the packed bed voidage. According to our measurements, the packed bed heights at 20 °C, 200 °C, 400 °C, and 600 °C were 23.7, 24.4, 25.3, and 26.6 cm, respectively, with variations of 3.0%, 6.7%, and 12.2% compared to the packed bed height at 20 °C.…”

Section: Resultsmentioning

confidence: 99%

“…According to our measurements, the packed bed heights at 20 °C, 200 °C, 400 °C, and 600 °C were 23.7, 24.4, 25.3, and 26.6 cm, respectively, with variations of 3.0%, 6.7%, and 12.2% compared to the packed bed height at 20 °C. Korkerd et al studied the impact of bed height on minimum fluidization velocity using a 10.2 cm inner diameter bed and three different diameters of silica particles . They obtained that the change in minimum fluidization velocity is proportional to the variation of ( H 0 / D 0 ) 0.076 , where H 0 is packed bed height and D 0 is bed diameter.…”

Section: Resultsmentioning

confidence: 99%

“…Korkerd et al studied the impact of bed height on minimum fluidization velocity using a 10.2 cm inner diameter bed and three different diameters of silica particles. 43 They obtained that the change in minimum fluidization velocity is proportional to the variation of (H 0 /D 0 ) 0.076 , where H 0 is packed bed height and D 0 is bed diameter. Thus, when we assumed the bed heights at elevated temperatures were the same as that at room temperature, the deviations of minimum fluidization velocity (U mf ) were estimated to be 0.2%, 0.5%, and 0.9%, representing that the change in bed height has no effect on minimum fluidization velocities.…”

Section: Minimum Fluidization Velocity (U Mf )mentioning

confidence: 99%

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Study of Fluidization Behavior Transition from Geldart B to A Induced by High Temperature Using Electrical Capacitance Tomography

Huang

Meng

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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The transition of the fluidization behavior of Geldart B particles to that of A particles induced by temperature change was investigated by a developed high-temperature electrical capacitance tomography (ECT) sensor. Silica particles with a Sauter mean diameter of 237 μm and density of 2650 kg/m3, typically Geldart B particles under ambient conditions, were fluidized in a column of 5.5 cm from 20 to 600 °C. With the increase in temperature, ECT measurements showed a decrease in minimum bubbling velocity (U mb), no bed expansion characteristic in the homogeneous fluidization regime, an absence of multiple-bubbles regime, and a larger bubble size. The pressure drop against superficial gas velocity curves at elevated temperatures confirmed homogeneous fluidization between the minimum fluidization velocity (U mf) and U mb. Our analysis demonstrates that cohesive interparticle forces, which increase linearly with temperature, are responsible for the fluidization behavior transition of the silica particles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Minimum Fluidization Velocity (U Mf )mentioning

confidence: 99%

See 1 more Smart Citation

Study of Fluidization Behavior Transition from Geldart B to A Induced by High Temperature Using Electrical Capacitance Tomography

Huang

Meng

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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“…As a result, part of the raw material is wasted, and energy consumption and production costs increase. The minimum fluidization velocity is considered to be an essential parameter in the successful fluidized bed characterization [6]. This velocity depends on the particle diameter and bed porosity, among other factors [7].…”

Section: Introductionmentioning

confidence: 99%

Minimum Velocity of Impingement Fluidization for Parachute-Shaped Vegetables

2022

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Accurate calculation of the minimum fluidization velocity makes it possible to reduce raw material losses due to the use of excessively high or excessively low air velocities. This is particularly true for impingement fluidization, which is little studied, especially when treating parachute-shaped raw material. This paper focused on determining the drag coefficient for cauliflower florets, mushrooms, and broccoli. Analysis of the critical particle lift velocity showed that the lowest value of the drag coefficient was found for mushrooms (0.9). The parachute-shaped vegetables analyzed had a large scatter of drag coefficient values associated with their specific shape (standard deviation: mushrooms 0.10 broccoli 0.14, and for cauliflower 0.15). The measured mean values of the minimum fluidization velocity of the tested vegetables in the impingement fluidization method ranged from 6.9 m∙s−1 to 10.97 m∙s−1. Application of the procedure recommended by Shilton and Narajan for calculating the minimum fluidization velocity on the basis of the shape coefficient ε resulted in large discrepancies between the calculated and experimental values (from 2.4 m∙s−1 to 3.8 m∙s−1).

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“…As the temperature rises, the gas molecules undergo thermal expansion, resulting in a decrease in gas density. Since Umf is inversely proportional to gas density, the decrease in density leads to a decrease in Umf [94].…”

Section: Geometry Initial and Boundary Conditionsmentioning

confidence: 99%

Improvement of hydrodynamics and heat transfer in biomass fluidized bed combustor with immersed tubes using CFD-DEM

Korkerd

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Computational Fluid Dynamics coupled with Discrete Element Method (CFD-DEM) has been extensively utilized for studying hydrodynamics and heat transfer in fluidization processes. This study specifically focuses on improving hydrodynamics and heat transfer in a biomass fluidized bed combustor with immersed tubes. The investigation involves the use of mixed biomass, exploring the effects of biomass types, biomass loading, and blending ratios to propose criteria for selecting suitable biomass fuel for the system. Design parameters related to the immersed tubes, such as the angle between tubes, tube diameters, and distance between tubes, were also considered. A data-driven model was developed based on the CFD-DEM results to predict system parameters. This model offers potential applications in real-time practical engineering without the need for CFD-DEM simulation. The CFD-DEM model was developed for cylindrical biomass and spherical silica sand particles, incorporating an appropriate drag force model. The results showed that the use of mixed biomass with a blending ratio of 1:3 of wood chips to coarse bagasse, with a 5% biomass loading using a ratio of the average equivalent diameter of the biomasses to the equivalent diameter of silica sand of 4.44, was identified as suitable conditions in a general case to obtain the most efficient hydrodynamic results in this study. The criteria for selecting biomass are cylindrical biomass with a greater equivalent diameter than silica sand. Additionally, the proportion of wood chips should be less than that of bagasse. Furthermore, through a 2k factorial design analysis, it was determined that the angle between tubes and tube diameter had the most significant influence on the system behaviors. Moreover, the development of Artificial Neural Network (ANN) models was successful using the simulation dataset, enabling accurate predictions of the mixing index, solid volume fraction, and solid temperature within the system. This study enhances the understanding of hydrodynamics and heat transfer within systems and provides valuable insights for optimizing the design and operation of applications involving mixed biomass and silica sand.

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Correlation for predicting minimum fluidization velocity with different size distributions and bed inventories at elevated temperature in gas-solid fluidized bed

Cited by 12 publications

References 63 publications

Study of Fluidization Behavior Transition from Geldart B to A Induced by High Temperature Using Electrical Capacitance Tomography

Study of Fluidization Behavior Transition from Geldart B to A Induced by High Temperature Using Electrical Capacitance Tomography

Minimum Velocity of Impingement Fluidization for Parachute-Shaped Vegetables

Improvement of hydrodynamics and heat transfer in biomass fluidized bed combustor with immersed tubes using CFD-DEM

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