Sounds like you are getting condensation in the duct. Correct? You may have low duct velocity as well. What is the ambient temp? Insulate the duct as a start and look at maintaining velocity above 20 to 22 m/s.

Michael Reid. ■

Originally Posted by nsavage1

using a 120 Kw dryer to dry filter cake, wet mill scale, etc (mostly fines)

having problems with reentrainment in the exhaust. small housing(not completely sealed) case at feed entry attached to 9'' diameter pipe with 90 deg elbow then about 12 feet to wet scrubber. All horizontal.

most blockage occurs at housing/pipe junction and in elbow. the long horizontal pipe will fill with time also.

internal drying temp usually around 250F.

exhaust temp at housing/pipe junction usually around 170F.

Would gladly give more info if willing to help

Nick

Hello Nick,

Most of your truoble starts at the elbow due to the 90 degree turn.

Your exhauast smacks the elbow and slows right down and thats

where the trouble begins. The material building up in the elbow

reduces the air flow and thus the air speed of the exhaust which

is also leaking.

Your simple quick fix would be a second fan wherein you remove the

elbow and install a T in its place fitting the second fan on the short side providing

more airflow to the air stream and eliminating the blockages.

As long as the bag house is not in the direct path of the boosted air flow you

should have no isues other than buying a fan and having a T fabricated for the exhaust. ■

Leon,

That is a complicated fix. There should be no blockages if there is no condensation (and the velocity is above transport velocity).

Michael Reid. ■