Steve:
I've done work with GAC and carbon pellets on and off for years. On rare occasion I've slurried it. It's been a lot more reliable to transfer as a dry solid most of the time, if and when possible. If fluidized with air, it moves pretty well and doesn't hang up too bad, assuming one uses the right fittings and connectors. Is it possible to transport dry?
When I've had to transport carbon in a slurry, the more dilute I could make it, the better (to a point) - recycle the water to minimze the cost and general "hassle". There ought to be data on friction effect, since years ago there was a lot of R&D into coal/water slurries for boiler fuel, but I've never looked into it.
... Bruce D. Bullough ...
Sebesta Blomberg & Associates, Inc.
2381 Rosegate
Roseville, MN 55113 USA
+ 651-634-7344
www.sebesta.com
-----Original Message-----
From: Steve McKenzie [mailto:mechproj@xtra.co.nz]
Sent: Wednesday, August 18, 2004 3:33 AM
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Carbon Transfer Piping - Friction Loss
[bcc][faked-from][bayes]
Gents+1
this is the second go I have had at this message; the original disappeared.
I am designing a small transfer system for granular activated carbon.
It will be transferred from a ground level hopper to an open tank about
5m higher up.
Intend using water as the conveying medium, and an eductor. The pipe
will be PE, 63PN8.
I would expect that the carbon will scrape on the pipe walls, so the
friction loss calculation is probably an empirical thing.
Has anyone seem any info on friction loss in wet carbon transfer (or other granular material) system? A reference would be appreciated.
I need this info so I can size/design the eductor, as backpressure is one of the major design inputs. If I stuff it up, the hopper will overflow and I will have to turn it into a pressure tank system which would be a pain. Hence my question.
Thanks
Cheers
Steve
Yahoo! Groups Links Received on Wed Aug 18 09:54:00 2004
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