Effect of operating conditions on the drying of fine and ultrafine sand in a fountain confined conical spouted bed

Pablos, Aitor; Vicente, Jorge; Altzibar, Haritz; Bilbao, Javier; Olazar, Martı́n

doi:10.1080/07373937.2019.1645684

Cited by 11 publications

(3 citation statements)

References 47 publications

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“…These differences are mainly explained by the surface properties of the materials, i.e., the ultrafine sand is more porous than the fine one and therefore diffusion of the moisture into the surface in the former slows down the drying process. 33 This behavior has also been proven in a fluidized bed, 34 in which the drying of the ultrafine sand required slightly longer times. Nevertheless, the other configuration assayed with this ultrafine material is more efficient (90.8%) and close to the values obtained with the fine sand.…”

Section: ■ Introductionmentioning

confidence: 70%

“…The decrease in the drying efficiency is reflected in the moisture content of the outlet air, which is approximately 65%. These differences are mainly explained by the surface properties of the materials, i.e., the ultrafine sand is more porous than the fine one and therefore diffusion of the moisture into the surface in the former slows down the drying process . This behavior has also been proven in a fluidized bed, in which the drying of the ultrafine sand required slightly longer times.…”

Section: Resultsmentioning

confidence: 96%

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Effect of the Solid Inlet Design on the Continuous Drying of Fine and Ultrafine Sand in a Fountain Confined Conical Spouted Bed

Sukunza

Pablos

Vicente

et al. 2020

Ind. Eng. Chem. Res.

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The effect that the solid inlet design has on the continuous drying of sand in a conical spouted bed has been studied. Five designs have been tried, four of which are feeding the solid from the top and the fifth one into the spout. Three internal devices have been tested, a draft tube, fountain confiner, and new solid driver, to drive the solid to the fountain periphery. A hydrodynamic study has been conducted using beds of dry particles to delimit stable systems, which have been used for the drying of sands of two different size ranges. The more efficient operation is attained by distributing the bed onto the annulus or by feeding the solid into the downward section in the fountain periphery. These configurations allow attaining high efficiencies, with the product moisture content being well below specifications and the bed temperature being close to the adiabatic saturation temperature.

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Section: ■ Introductionmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 96%

Effect of the Solid Inlet Design on the Continuous Drying of Fine and Ultrafine Sand in a Fountain Confined Conical Spouted Bed

Sukunza

Pablos

Vicente

et al. 2020

Ind. Eng. Chem. Res.

Self Cite

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“…Despite the aforementioned advantages, the conventional spouted beds have operational limitations that hamper effective industrial applications. Such limitations include maximum spouting bed height and column diameter, which are limitations for scaling-up spouted beds, and operating is conditioned by the spouting regime rather than by heat and mass transfer requirements. , There are different design strategies for the spouted beds to overcome these limitations, such as the conical geometry (conical spouted bed) and the use of internal devices (draft tubes and fountain confines). The conical geometry provides a stable operation in a wide range of gas flow rates, , whereas the use of the draft tube and fountain confiners improves the performance of the spouted bed, decreasing the minimum spouting velocity and the operating pressure drop required for stable conditions. − However, several researchers have mentioned drawbacks related to collapse and product retention when pastes and suspensions are processed in the spouted bed. ,− …”

Section: Introductionmentioning

confidence: 99%

Fluid Dynamic Analysis of a Modified Mechanical Stirring Spouted Bed: Effect of Particle Properties and Stirring Rotation

AzevedoBarros

Brito

Freire

et al. 2020

Ind. Eng. Chem. Res.

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The purpose of this study is to perform the fluid dynamic analysis of a modified mechanical stirring spouted bed, which has been proposed as a promising alternative to the conventional spouted bed. Thus, a comparison is also performed between the dynamic behaviors of such equipment. The addition of the stirrer to the spouted bed enhanced the movement of particles in the bed. The mechanical stirring spouted bed presented better performance than the conventional configuration at stirrer rotations above 90 rpm. Small particles were less susceptible to the effect of stirrer rotation than large particles, demanding a higher rotation to provide a lower minimum air flow rate. The proposed model provided good predictions in terms of maximum pressure drop and minimum air velocity in the modified mechanical stirring spouted bed. The findings of this study contribute to the development of versatile and promising equipment for different processes and operations, providing the key parameters for an appropriate design.

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Search for Operating Conditions in the Thermal Pistachio Splitting in Fountain Confined Conical Spouted Beds

Sukunza,

Bolaños,

Tellabide

et al. 2024

Food Bioprocess Technol

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The worldwide consumption of pistachio nuts has been increasing over the last decades due to their high nutritional value. Given that only split nuts are commercialised, the closed-shell nuts, which account for most of the harvested ones, must be split by mechanical or thermal processes. However, there is hardly any information about the splitting mechanism based on thermal treatments. Accordingly, the thermal splitting of pistachio nuts in conical spouted beds has been approached, and the effect of the air inlet temperature, the draft tube aperture ratio and the air inlet diameter on the splitting mechanism has been analysed. Batch drying tests have been carried out in the proposed technology at an air inlet temperature range of 40–120 $${}^{\circ }\text {C}$$ ∘ C using configurations with and without draft tube. The operating temperature and dryer configuration that allows attaining up to 60% of split pistachios and preserving their quality are 80 $${}^{\circ }\text {C}$$ ∘ C , an inlet diameter of 0.05 m and an open-sided draft tube with an aperture ratio of 80%.

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Effect of operating conditions on the drying of fine and ultrafine sand in a fountain confined conical spouted bed

Cited by 11 publications

References 47 publications

Effect of the Solid Inlet Design on the Continuous Drying of Fine and Ultrafine Sand in a Fountain Confined Conical Spouted Bed

Effect of the Solid Inlet Design on the Continuous Drying of Fine and Ultrafine Sand in a Fountain Confined Conical Spouted Bed

Fluid Dynamic Analysis of a Modified Mechanical Stirring Spouted Bed: Effect of Particle Properties and Stirring Rotation

Search for Operating Conditions in the Thermal Pistachio Splitting in Fountain Confined Conical Spouted Beds

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