Discussion
Arrange the air path through an aspiration and dust recovery system:
1. Air is drawn through the falling grain curtain
2. Light material is entrained and carried upward
3. The cyclone separates the entrained material from the air
4. Cleaned air passes to the fan and discharge
Select the correct sequence.
Answer: C
Correct answer: 1, 2, 3, 4
The air follows this path. It is drawn through the falling grain curtain (1), where the separation actually happens, and the light material - chaff, dust, shrivelled grain - is entrained and carried upward (2).
The laden air passes to a cyclone, which separates the entrained material from it by centrifugal action (3), dropping the solids to a collection point. The cleaned air then passes to the fan and to discharge (4). Placing the fan last keeps the abrasive dust out of it, which matters greatly for wear.
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