[Gasification] Biofiber drying quantification

[Mark Ludlow]

Norma,

Have you considered pelletizing (what size pellet do you desire?) and then
post-drying? Significant sensible heat is generated during pelletizing which
gets drying going.

Ideal radiant surfaces for water drying are often about 800F. IR is ideally
in the1-to-8 micron wavelength range which is particularly efficient for
water evaporation.

Mark

-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org] On Behalf Of Norma McDonald
Sent: Thursday, January 31, 2008 3:58 AM
To: gasification at listserv.repp.org
Subject: [Gasification] Biofiber drying quantification

We are trying to reduce the moisture level in the biofibers that are
mechanically (screw press) separated after anaerobic digestion of manure.?
The moisture content is 65-70%, all tightly bound to the lignocellulosic
fibers (no free moisture).? We want to lower this using waste heat (250F -
500F air) from the generator down to ~20% moisture so that we can pelletize
for fuel pellets.? We are also thinking of directly gasifying these
materials.? 

Dynamic air flow produces too much dust and fibers all over the process
area, so we are thinking about radiant heating in an auger.? For our first
installation, the flow rate requires removal/evaporation of 4 gallons per
minute.? How do I calculate the time and surface area required in order to
design the heat exchanger?


Norma McDonald


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