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CAT NO: DIDACTICNLE-Export-210033
Gas Flow Classification- Engineering Lab Training Systems.
Technical Description
Zigzag sifters permit
classification of solid compounds. The solid compound being separated is
charged into the feed hopper. The compound is fed into the zigzag duct
of the sifter at mid-height by way of a vibrating trough. An air stream
flows upwards through the vertical duct. Depending on the geometry and
density of the particles, they are carried along by the air or drop down
due to gravity. At every bend in the duct the solid compound passes
through the air stream and falls onto the opposite wall of the sifter.
This corresponds to one sifting stage. Owing to the flow conditions, a
vortex wake is formed between two bends of the zigzag duct. It ensures
that the solid matter moves roughly perpendicular to the airflow. In
this way, a transverse sift takes place at every bend. Sequencing of
large numbers of such stages results in very fine separation. features a
20-stage zigzag duct. Transparent material provides optimum observation
of the processes in the duct.
A fan generates the airflow. The
airflow rate and the solid mass flow are adjustable. The fine material
transported upwards with the air stream is separated by a cyclone.
Pressure measurement points at the relevant positions in the trainer
enable to determine the pressure loss.
Sand in different particle
sizes is recommended for use as the feed material. For particle size
analyses of the feed and of the coarse and fine material, a balance and a
screening machine are recommended.
The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.
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