Eulerian study of flights discharge in a rotating drum

Nascimento, Suellen Mendonça; Lima, R. M. C.; Brandão, Rodolfo J.; Duarte, Cláudio Roberto; Barrozo, Marcos A.S.

doi:10.1002/cjce.23291

Cited by 17 publications

(2 citation statements)

References 28 publications

(50 reference statements)

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“…In the conventional drum, the flight is parallel to the axis of the drum wall [10]. Therefore, these drums are installed in an inclined state, in which the fillers can move from the inlet towards the outlet by gravity [11,12]. However, there are several problems with these inclined drums, such as complex construction, disadvantageous installation, serious…”

Section: Introductionmentioning

confidence: 99%

DEM Simulation of a Rotary Drum with Inclined Flights Using the Response Surface Methodology

Zhu

Xie

et al. 2023

Processes

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Conventional flighted rotary drums usually have flights parallel to the rotating axis, which cannot facilitate the axial motion of the materials in the drum. Here, a new type of horizontal rotary drum with inclined flights and beads was designed. Inclined flights are used to facilitate the axial movement of beads and material, while beads are used as fillers to increase the gas-liquid contact area and to crush the solid materials. We simulated the drum and studied the axial motion of fillers using the discrete element method (DEM). To improve the mass and heat transfer performance, we optimized the distribution of beads in the active phase. The effects of the rotational speed, joint angle, and inlet flow rate in the drum were investigated systematically. The individual effects were evaluated in terms of the mass of particles in the active phase (MAP) and passive phase (MPP), the percentage of the active phase occupied by the particles (OAR), and the axial speed (AS). The response surface methodology (RSM) was used to investigate the significant effects of the interaction between the parameters. The maximum MAP value can be obtained by the following parameters: a rotational speed of 37 rpm, joint angle of 139°, and inlet flow rate of 7.83 kg/s. The interaction between rotational speed and inlet flow rate is the most significant for MAP. The joint angle and inlet flow rate have a significant interactive effect on AS. Besides, the rotational speed, joint angle and inlet flow rate show an interactive effect on OAR and AS. Based on the optimization results, the effect of the inclined angle on the axial motion of beads was also evaluated. The axial motion of the beads occurs mainly in the active phase. Compared to the drum without inclined flights, the drum with inclined flights has an enhanced axial speed increased by 26%. This study will be helpful for the design and optimization of drums with inclined flights.

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Section: Introductionmentioning

confidence: 99%

DEM Simulation of a Rotary Drum with Inclined Flights Using the Response Surface Methodology

Zhu

Xie

et al. 2023

Processes

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“…The dust produced by ACBs grinding would be blown away by the drying air and leave the drum from the other side of the periphery. The dynamic behavior of the particles in a rotary drum largely depends on operational conditions [12][13][14], flow properties, and the physical properties of the material [15][16][17][18][19], as well as the geometric configuration of the drum [19,20]. Many efforts have been made to analyze the particulate material's dynamic behavior from various perspectives [17,[21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

A Novel Rotary Dryer Filled with Alumina Ceramic Beads for the Treatment of Industrial Wastewaters: Numerical Simulation and Experimental Study

Xie

Yang

et al. 2021

Processes

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In this study, a new type of rotary dryer filled with inert alumina ceramic bead (ACB) fillers was introduced to treat the industrial wastewater, e.g., the high-salt wastewater and landfill leachate. Numerical simulations based on the Discrete Element Method (DEM) on the motion trajectory of ACB fillers in the rotary dryer were conducted, and the parameters of flight structure, rotational speed, and filling degree on the dynamic behavior of ACB fillers were optimized. Under various rotational speeds and filling degrees, the experimental results fit the numerical-simulated results very well. The optimized flight configuration was the straight flights with a length of 65 mm, and the optimized rotational speed and filling degree were 35 rpm and 15%, respectively. Under the optimized condition, both the response variables, the mass of particles in the airborne phase (MAP) and the percentage of occupied area in the airborne region (OAR), have the optimal values, in which the dryer will have a better drying performance. Besides, the lower-right area of the drum is empty which is convenient for the installation of the inlet pipe. The drying experiments of industrial wastewaters were also studied using this ACB filled rotary drum dryer under the optimized conditions. Under the optimal operational conditions, the evaporation capacities of the high-salt wastewater and landfill leachate could reach as high as 49.7 kg/h and 90 kg/h, respectively. This study highlights the integration of evaporation and drying processes of this novel ACB filled rotary dryer and provides an efficient and zero-liquid-emission strategy for the thermal treatment of industrial wastewater.

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CFD in Chemical Engineering: Process Design Symposium at the 10^th World Congress of Chemical Engineering (WCCE10)

Nunhez¹,

Derksen²,

Ranade³

2019

Can J Chem Eng

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Eulerian study of flights discharge in a rotating drum

Cited by 17 publications

References 28 publications

DEM Simulation of a Rotary Drum with Inclined Flights Using the Response Surface Methodology

DEM Simulation of a Rotary Drum with Inclined Flights Using the Response Surface Methodology

A Novel Rotary Dryer Filled with Alumina Ceramic Beads for the Treatment of Industrial Wastewaters: Numerical Simulation and Experimental Study

CFD in Chemical Engineering: Process Design Symposium at the 10^th World Congress of Chemical Engineering (WCCE10)

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Eulerian study of flights discharge in a rotating drum

Cited by 17 publications

References 28 publications

DEM Simulation of a Rotary Drum with Inclined Flights Using the Response Surface Methodology

DEM Simulation of a Rotary Drum with Inclined Flights Using the Response Surface Methodology

A Novel Rotary Dryer Filled with Alumina Ceramic Beads for the Treatment of Industrial Wastewaters: Numerical Simulation and Experimental Study

CFD in Chemical Engineering: Process Design Symposium at the 10th World Congress of Chemical Engineering (WCCE10)

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CFD in Chemical Engineering: Process Design Symposium at the 10^th World Congress of Chemical Engineering (WCCE10)