Abstract
The main objective of this paper is to investigate the mixing process of free flowing polymers binary mixtures at different densities and colors in two different mixers, namely the bubbling fluidized bed and V-mixer. The mixing of solids was studied by analyzing the variation of the proportions of the marked particles with time and position in the bed or in the mixer. The variation of mixture composition based on the samples was incorporated into Lacey mixing index which describes the degree of mixing of the particles at particular time. The performance and the mixing behavior in these two mixers were also presented. Results showed that gas velocity and bed depth were important parameters influencing solids mixing in a bubbling fluidized bed. While the rotation speeds and filled up levels were proved as important parameters in influencing the solids mixing in V-mixer. From the results, complete mixings were attained at a bed depth of 17 cm and gas velocity of 1.38Umf in the fluidized bed and 40 % filled up level and 40 rpm in the V-mixer. From the energy consumption point of view, it was found that the fluidized bed mixer offers the most efficient and economical process compared to V-mixer.
Highlights
A successful mixer must do at least two things; firstly, it must create differential velocities in the moving solid, which will produce mixing, Secondly, it must leave no dead, non-moving regions, as these regions cannot mix
For mixing in V-mixer and Nauta-mixer, the ideal calculation indicated that the mixing index depends on the rotation speeds, as well as filled up levels, which indicate the amount of energy used
The results proved that fluidized bed consume very low energy that is in the range of 0.015 to 0.02 J/kg
Summary
A successful mixer must do at least two things; firstly, it must create differential velocities in the moving solid, which will produce mixing, Secondly, it must leave no dead, non-moving regions, as these regions cannot mix. Solids mixing are an important process in manufacturing many industrial products like pharmaceutical, chemical, petrochemical, foodstuffs, plastics, metallurgical, fertilizers, grain etc. The objectives of the study is to determine the optimum operating condition in order to obtain a final mixture of specified compositions of polymer A and B, namely, 3:1, respectively followed by investigating the mixing performance in V-mixer and fluidized bed. This study will determine the best type of mixer to be used in order to obtain the most efficient and economical mixing system
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