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 Products:  Process Engineering » Mechanical Process Engineering » Separation Methods: Classifying and Sorting » CE 275
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CE 275: Gas Flow Classification

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Gas Flow Classification

Gas Flow Classification Gas Flow Classification Gas Flow Classification

Product Details

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. CE 275 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 (CE 264) are recommended.
 The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments
- Learning the fundamental principle of wind sifting (gas flow classification)
- Classification of various solid compounds
- Determination of particle size distribution in the feed material and the fine and coarse material (fraction balance)
- Creation of a separation function
- Influence of airflow rate and mass flow of feed material on
  + separation size
  + separation effect
  + pressure losses

* Gas flow classification with a zigzag sifter1
* Transparent duct to observe the separation process1
* Practical experiments on a laboratory scale
[1] Zigzag sifter to separate solid compounds
[2] Feed hopper with vibrating trough for feed of solid compound into sifter
[3] Dosage of feed material by way of distance of hopper outlet from vibrating trough, throw and frequency of vibrating trough
[4] Separation of solid compound into coarse and fine material with airflow in 20-stage zigzag duct
[5] Airflow generation by fan; adjustment by valve
[6] Separation of fine material from airflow by gas cyclone with tangential inlet
[7] 3 tanks for feed material and coarse and fine materials
[8] Recording of airflow rate and differential pressure through sifter and cyclone

Technical Data
Vibrating trough
- throw: 0.2...1.5mm
- vibration frequency: 50Hz or 100Hz
Zigzag sifter
- height: approx. 1500mm
- cross-sectional area: 40x40mm
- height: approx. 400mm
- diameter: approx. 100mm
- power consumption: approx. 2kW
- feed hopper: 20L
- coarse material: 10L
- fine material: 10L
Measuring ranges
- cyclone and sifter differential pressures: 0...100mbar
- airflow rate: approx. 60m3/h

Dimensions and Weight
l x w x h : 1000 x 600 x 2200 mm (without fan)
Weight : approx. 150 kg

230V, 50Hz, 1 phase

Scope of Delivery
1 trainer, 1 set of instructional material

Order Details
083.27500  CE 275  Gas Flow Classification

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Grindelallee 188, 20144 Hamburg / Germany
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