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CE 275 Gas Flow Classification
Education / GUNT Hamburg / Process Engineering / Mechanical Process Engineering /

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.

  Activated carbon 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)

- sorting

  * coarse material fraction

  * fine material fraction

  dependent on solid mass flow rate and airflow rate 

- classifying (with CE 264)

  * fraction balance

  * separation function

  * separation size

  * sharpness of separation

  dependent on solid mass flow rate and airflow rate

- pressure losses of

  * sifter

  * cyclone

  dependent on solid mass flow rate and airflow rate


[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 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
- mass flow: max. 10kg/h
- vibration frequency: max. 3.000min-1
Zigzag sifter
- height: approx. 1.500mm
- cross-sectional area: 40x50mm
- height: approx. 550mm
- diameter: 150mm
- power consumption: approx. 3,6kW
- feed hopper: 3L
- coarse material: 2L
- fine material: 2L
Measuring ranges
- cyclone and sifter differential pressures:

- airflow rate: approx. 100m3/h


Dimensions and Weight

LxWxH: 1.660x790x1.930mm (trainer)

LxWxH: 660x508x880mm (fan)
Weight: approx. 160kg

Required for Operation 230V, 50Hz, 1 phase Scope of Delivery

1 trainer

1 fan

2 packing unit with feed material

2 buckets, 1 shovel, 1 stop watch
1 set of instructional material

Order Details 083.27500  CE 275  Gas Flow Classification