Energy analysis of intermittent drying in the spouted bed

Brito, Ronaldo Correia de; Béttega, Rodrigo; Freire, José Teixeira

doi:10.1080/07373937.2018.1512503

Cited by 18 publications

(11 citation statements)

References 34 publications

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“…A single-phase model is proposed for a single particle, and the assumptions usually adopted in spouted bed systems to account for the whole bed are then evaluated in both continuous and intermittent processes. The present study involves the consolidation of our previous studies dealing with spouted bed intermittent drying from energy and quality perspectives. , …”

Section: Introductionmentioning

confidence: 99%

Intermittent Drying of Soybeans in Conical Spouted Beds: Modeling Approach

Brito

Tellabide

Atxutegi

et al. 2023

Ind. Eng. Chem. Res.

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Intermittent drying is a promising methodology to conventional drying which offers benefits related to energy and better-quality products. However, modeling of this technique remains a challenge. Thus, this study aims to propose a fully predictive model for intermittent drying in conical spouted bed dryers. A single-phase model is used to account for the heat and mass transfer on the soybean surface and their inside, and the predictions are compared with the experimental results. The proposed model provides physically consistent results and is coherent with the experimental data, mainly for drying under moderate air temperatures with moderate and long resting periods. As the average moisture content and the average particle temperature are estimated based on the spatial discretization used in the numerical solution, as well as on the boundary conditions adopted, the internal gradients of moisture and temperature are also estimated by the model, thus providing a physically consistent representation of the internal gradient behavior. Therefore, this study describes the successful application of an accurate model for continuous and intermittent drying. Accordingly, it contributes to obtain optimal drying parameters in order to minimize drying costs and improve product quality.

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Section: Introductionmentioning

confidence: 99%

Intermittent Drying of Soybeans in Conical Spouted Beds: Modeling Approach

Brito

Tellabide

Atxutegi

et al. 2023

Ind. Eng. Chem. Res.

Self Cite

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“…Drying aconts for a costly fraction in the indursty in terms of energy consumption, and it which may vary from 27 to 70% depending on the type of the product processed, making the efficient use of the fuel used essential (Kudra, 2004). This high energy demand is associated with the heat required for water removal, the inefficiency of the heat transfer process between the drying air and the product, as well as the losses related to most industrial dryers (Brito et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Corn grains drying using direct-fired furnace with wood chips: Performance, quality and polycyclic aromatic hydrocarbons

et al. 2022

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The objective of this work was to evaluate the drying performance, the quality of the corn grain and the contamination by polycyclic aromatic hydrocarbons (PAHs) using a direct-fired furnace fed automatically by wood chips. Samples were collected at five-minute intervals, 12 samples before drying and 12 samples after drying. The following experimental evaluations were carried out: dryer -performance and fuel consumption; grains -moisture content, germination, electrical conductivity, apparent specific mass, mass of a thousand grains, color and PAHs. The dryer showed an average efficiency of 83.61%. The average consumption of wood chips was 0.3932 kg of chips per kilogram of evaporated water. Differences were observed in the grains after drying for the characteristics of mass of a thousand grains, apparent specific mass, germination and electrical conductivity. The average concentrations of PAHs in corn grains were higher than the maximum values allowed by the European Union legislation.

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“…As detailed below, in this work, we define it as the ratio of the duration of the active drying period of a cycle (i.e., the effective drying time of the cycle) to the total duration of the cycle. These two parameters influence the drying efficiency, the total duration of the drying, as well as the quality of the products [4,7,10,12,14,23,27,[29][30][31]. A decrease of the intermittency ratio appears to contribute to decrease the percentage of cracks in rice [23] or soy beans [31], to decrease the effective drying time (i.e., the total duration of the drying minus the duration of the tempering periods) and thus the energy consumption [12,12,29,30,30,31].…”

Section: Introductionmentioning

confidence: 99%

“…These two parameters influence the drying efficiency, the total duration of the drying, as well as the quality of the products [4,7,10,12,14,23,27,[29][30][31]. A decrease of the intermittency ratio appears to contribute to decrease the percentage of cracks in rice [23] or soy beans [31], to decrease the effective drying time (i.e., the total duration of the drying minus the duration of the tempering periods) and thus the energy consumption [12,12,29,30,30,31]. The influence of the intermittency ratio on the drying rate has been investigated in several papers [10,27,[29][30][31], but only a few studies have considered the impact of the duration of the drying-tempering cycles [10,16] on the drying kinetics.…”

Section: Introductionmentioning

confidence: 99%