Pneumatic Conveying
Pneumatic Conveying
(OP)
Am currently designing a dilute phase pneumatic transfer system to convey a dense powder. Have a 6 foot lift and a 2 foot lift with about 30 feet horizontal between 2 lifts. Question - should "horizontal" pipe (between 2 lifts) be horizontal, sloped up or down from 1st to 2nd lift. Can find plenty info on velocities and such but no web info on which way if any to slope. Since I can't slope back at 30 deg. my feeling is back slop won't do any good - pipe won't drain clear if I loose air. And no good to slope down to 2nd lift, because that just causes me to lift sloped height differential twice. So am tending to run "horizontal" run horizontal. Suggestions?





RE: Pneumatic Conveying
I've seen plenty of pneumatic conveying lines which are horizontal. However when you loose air the powder will settle out in the pipe. On restarting the flow could become "slug" flow and the powder "slug" will be accelerated down the system. May not be a problem for you with such short lengths but for long lines it is a definite problem as the "slugs" hit any changes in direction.
RE: Pneumatic Conveying
RE: Pneumatic Conveying
RE: Pneumatic Conveying
Better experts, on the web, are at
http://www
Good luck,
RE: Pneumatic Conveying
Apologies for getting knotted up in my own thread but...
I followed up with similar post on forum you recommended. Already got back a reply -
"Stick to truly vertical and horizontal lines of you can...inclines between 20 and 80 degrees to horizontal will require more air to avoid deposition and recirculation. Also, keep number of bends as low as possible. Inclining downwards should be OK for relatively short runs."
RE: Pneumatic Conveying
As I already said, they are better experts. However my idea was totally not baseless and I see nobody suggesting to strictly avoid the slope against the direction of air flow.
Basically when you have to work against a weight on a slant plane, you have to take care about the axial component of its weight only(which is always lesser than total weight). This may or may not hold good for fluidized particles as lot of other parameters come into picture, but I still feel sure that it is more difficult to lift a mass straight upwards.
Regards,
RE: Pneumatic Conveying
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