Question

The collection efficiency of cyclone separators increases with:

1) Decreasing particle size

2) Increasing particle density

3) Decreasing gas velocity

4) Increasing number of gas revolutions

5) Increasing cyclone diameter

Which of the above statements are correct?

1. 1, 3 and 4 only
2. 2 and 4 only
3. 2, 4 and 5 only
4. 1, 2, 3, 4 and 5

Answer 1

Correct Answer - Option 2 : 2 and 4 only

Explanation:

Cyclone seperator:

• A cyclone separator is a device that separates particles from a gas stream using centrifugal force.
• The solid particles which are denser than the gas, have a high centrifugal force, which directs them to the walls, where they collide and lose momentum and get separated easily.
• Hence, cyclone separator efficiency increases with increase in density of particles and size of particle.
• Also, with increase in speed of revolution, the gas flow rate increases and it creates a swirling movement inside the separator, because of which the particles get easily separated after striking the walls.