REVAMP DO DRUM MIXER DAS PLANTAS DE SINTERIZAÇÃO 1 E 2 DA USIMINAS

2019 ◽  
Author(s):  
Marcos Cordeiro Fonseca ◽  
Manoel Gomes de Souza Neto ◽  
Roberto Gomes da Silveira Junior ◽  
Geraldo da Conceição Morais
Keyword(s):  
Drum Mixer

Stochastic Modelling of Particle Segregation in a Horizontal Drum Mixer

1992 ◽  
Vol 57 (10) ◽  
pp. 2100-2112 ◽  
Author(s):  
Vladimír Kudrna ◽  
Pavel Hasal ◽  
Andrzej Rochowiecki
Keyword(s):  
Differential Equation ◽  
Diffusion Coefficient ◽  
Stochastic Model ◽  
Diffusion Process ◽  
Stochastic Modelling ◽  
Solid Particles ◽  
Kolmogorov Equation ◽  
Particle Segregation ◽  
Drum Mixer ◽  
Horizontal Drum

A process of segregation of two distinct fractions of solid particles in a rotating horizontal drum mixer was described by stochastic model assuming the segregation to be a diffusion process with varying diffusion coefficient. The model is based on description of motion of particles inside the mixer by means of a stochastic differential equation. Results of stochastic modelling were compared to the solution of the corresponding Kolmogorov equation and to results of earlier carried out experiments.

DEM investigation of heat transfer in a drum mixer with lifters

2017 ◽  
Vol 314 ◽  
pp. 175-181 ◽  
Author(s):  
Qiang Xie ◽  
Zuobing Chen ◽  
Qinfu Hou ◽  
A.B. Yu ◽  
Runyu Yang
Keyword(s):  
Heat Transfer ◽  
Drum Mixer

scholarly journals Regression model of the influence of the height of drum mixer blades on the quality of mixture

2020 ◽  
Vol 175 ◽  
pp. 05047
Author(s):  
Konstantin Fudin ◽  
Vladimir Konovalov ◽  
Vladimir Zaitsev ◽  
Vyacheslav Teryushkov
Keyword(s):  
Coefficient Of Variation ◽  
Experimental Error ◽  
Functional Dependence ◽  
Mixing Time ◽  
Computer Processing ◽  
Fourth Level ◽  
Drum Mixer ◽  
Design Factors

The aim of the research was to establish the influence of the number and height of blades of a drum mixer on the quality of the prepared mixture of concentrated feed. The research method of the drum mixer provided for the experimental determination of the coefficient of variation (unevenness) of the mixture with a three-level combination of the blades height and their number. The absence of an extremum according to the obtained data required the use of a fourth level of the number of blades. Computer processing of the results made it possible to establish a functional dependence of the influence of design factors on the quality of the mixture. The implementation of the used research methodology for the operation of the drum mixer made it possible to establish an adequate functional dependence of the influence of the number of blades and their height on the quality of the mixture. The number of blades used practically does not affect the coefficient of variation of the content of the control component. The values change less than experimental error. However, existing trends indicate a slight (about 1%) decrease in the coefficient of variation of the mixture with an increase in the number of blades from 2 to 8 pcs. For 50 kg of feed in a drum capacity of 0.26 m3, the height of the blades is about 0.15 m. The increase or decrease in the height to 0.125 m or 0.175 m affects the quality of the mixture, increasing the coefficient of variation from 20.6% to 34-50% at the proportion of the control component of 1% and the mixing time of 200 seconds.

The Mixing Characteristics and Residence Time Distribution of Cut Tobacco Particles in Drum Mixer

2011 ◽  
Vol 396-398 ◽  
pp. 297-301
Author(s):  
Wen Kui Zhu ◽  
Dong Liu ◽  
Jin Song Du
Keyword(s):  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Plug Flow ◽  
Processing System ◽  
Rotating Speed ◽  
Drum Mixer ◽  
Method Effects ◽  
Residence Time Distributions ◽  
Cut Tobacco

Residence time distributions were determined for the continuous processing of cut tobacco in the rotary drum by introducing expanded cut tobacco tracers to the inlet of the processing system using the negative step change method. Effects of rotating speed of the rotary cylinder and solids flow rate on the mixing homogenization and residence time distribution (RTD) of experiment materials was investigated. PER-CSTR series model and multistage CSTR model were used to fit the experimental results. The result shows mixing homogenization increased significantly with the increasing feeding rate of cut tobacco and decreasing drum rotating speed. PER-CSTR series model is more suitable to describe the RTD characteristics of flow materials in drum. The axis movement of cut tobacco along the drum is approximate to the plug-flow.

Description of segregation in a horizontal drum mixer by use of the diffusion equation

1988 ◽  
Vol 53 (4) ◽  
pp. 771-787 ◽  
Author(s):  
Vladimír Kudrna ◽  
Andrzej Rochowiecki
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Equation ◽  
Two Dimensions ◽  
Solid Particles ◽  
Axial Segregation ◽  
Variable Diffusion Coefficient ◽  
Drum Mixer ◽  
Forward Diffusion ◽  
Variable Diffusion ◽  
Horizontal Drum

An attempt has been made to describe the axial segregation of solid particles of two dimensions in a horizontal drum mixer. For this purpose the Kolmogorov's forward diffusion equation with variable diffusion coefficient and zero drift velocity was used. For the case of "pure" segregation this approach has given good results.

THE ROTARY DRUM MIXER OPERATION PROCESS MODEL AND THEORETICAL JUSTIFICATION OF ITS PARAMETERS

2017 ◽  
Vol 2 (1) ◽  
pp. 42-49
Author(s):  
Nikolay Dimitriev ◽  
Vladimir Konovalov ◽  
Vyacheslav Teryushkov ◽  
Aleksey Chupshev
Keyword(s):  
Process Model ◽  
Theoretical Justification ◽  
Operation Process ◽  
Drum Mixer ◽  
Rotary Drum
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