Effect of mechanical energy on the energy efficiency of spouted beds applied on drying of sorghum [ Sorghum bicolor (L) moench]

Brito, Ronaldo Correia de; Pádua, Thiago Faggion de; Freire, José Teixeira; Béttega, Rodrigo

doi:10.1016/j.cep.2017.03.021

Cited by 28 publications

(17 citation statements)

References 30 publications

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“…In addition, a greater amount of energy would be required to rupture the solids bed and form the spout channel. Barrozo et al [37], Brito et al [8], and Sari et al [11] reported similar behavior for spouted beds operating with glass beads, sorghum seeds, and zirconia, respectively.…”

Section: Numerical Solutionmentioning

confidence: 77%

“…The experimental unit included a Venturi air distributor. Details of the experimental setup and procedure can be found in Brito et al [8]. The fluid dynamics experiments employed 1 kg (H 0 = 0.110 m) and 2 kg (H 0 = = 0.150 m) of previously dried sorghum seeds.…”

Section: Methodsmentioning

confidence: 99%

“…Of these, the spouted bed can be highlighted as providing excellent rates of heat and mass transfer, together with good mixing of the solid phase. Consequently, the spouted bed has been employed in many industrial procedures, including coating [1], granulation [2], chemical reactions [3], pyrolysis [4], gasification [5,6] and drying [7,8].…”

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confidence: 99%

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Influence of inlet air distributor geometry on the fluid dynamics of conical spouted beds: A CFD study

Batista

Brito

Béttega

2018

CI&CEQ

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The spouted bed presents limitations in terms of scale-up. Furthermore, its stability depends on its geometry as well as the properties of the fluid and solid phases. CFD provides an important tool to improve understanding of these aspects, enabling a wide range of information to be obtained rapidly and at low cost. In this work, CFD simulation was used to evaluate the effects of different inlet air distributors (Venturi and straight tube) and the effects of static bed height on the fluid and solid dynamics of a conical spouted bed. Simulations were performed using the two-dimensional Euler-Euler approach. In order to evaluate the fluid dynamics model, static pressure data obtained by simulation were compared with experimental data obtained with the Venturi distributor. The fluid and solid dynamics of the conical spouted bed were obtained by CFD simulation. The results showed that the pressure drop was lower for the straight tube air distributor, while the Venturi air distributor provided higher stability and a more homogenous air distribution at the bed entrance.

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Section: Numerical Solutionmentioning

confidence: 77%

Section: Methodsmentioning

confidence: 99%

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Influence of inlet air distributor geometry on the fluid dynamics of conical spouted beds: A CFD study

Batista

Brito

Béttega

2018

CI&CEQ

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“…The GCI calculation procedure is described by Elsayed and Lacor. 35 For the GCI test, three simulations with different grid refinements were performed using the spouted bed with cone angle of 60°(Brito et al 2 ) and 4 s of real-time simulation. The fine, medium, and coarse grids had 14 585, 10 778, and 8475 cells, respectively.…”

Section: Cfd Modelingmentioning

confidence: 99%

Computational Fluid Dynamics Evaluation of the Influence of Cone Geometry on Solids Circulation in Spouted Beds

Souza

Freire

Béttega

2018

Ind. Eng. Chem. Res.

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The influence of cone angle on solids circulation was investigated using a computational fluid dynamics (CFD) Euler–Euler multiphase model. The solids mass flow rate in the spout and the average particle cycle time were used to evaluate the solids circulation rate for seven cone angles with different loads of solids. A factorial design was applied to evaluate the effects of cone angle, solids load, and inlet air velocity on particle circulation. The proposed CFD method for measurement of the particle cycle time showed good agreement with experimental data reported in the literature and could be applied to investigate solids circulation for other particles and spouted bed geometries The solids load had the greatest effect on the particle cycle time, followed by the cone angle. Simulation results showed that lower cone angles favored solids circulation in spouted beds and could be used to improve the drying of sorghum in the equipment.

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“…Song et al (2014) studied pelletising of cellulosic biomass; Tumuluru (2016) used a Box–Behnken experimental design to understand the effects of the moisture content of lodgepole pine grind, die speed and preheating temperature on the pellet quality and specific energy consumption. De Brito et al (2017) investigated the effects of temperature and feedstock load on the drying efficiency, energy efficiency and the specific energy consumption of the drying process of sorghum bicolour by using a face-centred central composite (FCC) design with two levels, three replicates at the central point and four axial points – 11 experiments in total. Morero et al (2017) compared different types of solvents in biogas upgrading process by using RSM to observe operational effects (temperature, pressure, concentration) on energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of biomass catalytic depolymerisation conditions by using response surface methodology

et al. 2019

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The aim of this study is to present the optimum operating conditions for reducing energy consumption in the process of obtaining bio-oil from the mixture of sawdust, waste lubricating oil, lime, and commercial catalyst. In the study where the catalytic pressureless depolymerisation (also called Katalytische Drucklose Verölung – KDV) was applied, the operating conditions were analysed with response surface methodology. According to the analysis of variance results, a mathematical model was obtained for specific product yield (bio-oil amount/energy consumption g kWe−1). Effects of temperature (260°C–290°C), catalyst rate (1–2 wt.%) and reaction time (0.5–1 h) were investigated. The optimum conditions for the three independent variables (temperature, catalyst rate, reaction time) were 279 ± 2°C, 2 wt.% and 0.5 h, respectively. Maximum specific product yield was obtained as 970.17 g kWe−1. While the reaction time was the most effective regarding the amount of bio-oil obtained at 1 kWe energy consumption, the temperature was found to be the least effective. In addition to these, bio-oil obtained under optimum conditions were characterised and compared with standard diesel specifications.

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Effect of mechanical energy on the energy efficiency of spouted beds applied on drying of sorghum [ Sorghum bicolor (L) moench]

Cited by 28 publications

References 30 publications

Influence of inlet air distributor geometry on the fluid dynamics of conical spouted beds: A CFD study

Influence of inlet air distributor geometry on the fluid dynamics of conical spouted beds: A CFD study

Computational Fluid Dynamics Evaluation of the Influence of Cone Geometry on Solids Circulation in Spouted Beds

Optimisation of biomass catalytic depolymerisation conditions by using response surface methodology

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