The linear velocity issue in the secondary cyclone separator versus the primary cyclone separator
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Why is the linear velocity in the secondary cyclone separator inside the reactor higher than that in the primary cyclone separator? There shouldn’t be any energy loss; shouldn’t the line speed be lower? For example, the linear velocity in our primary cyclone separator is 22 m/s, while that in the secondary cyclone separator is 24 m/s.
This is related to the cross-sectional area; as the cross-sectional area for secondary centrifugation decreases, the linear velocity increases
In other words, the cross-sectional area at the inlet of the twin rotor is small, so the linear velocity increases!
Yes, I remember that the cross-sectional area of our secondary entrance is about 0.2 m2 smaller than that of the primary entrance
The particulate matter in the secondary flue gas has a smaller particle size; therefore, the secondary cyclone requires a higher inlet velocity to generate greater centrifugal force and thus improve efficiency.
The answer above is correct; it’s indeed that principle