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<DIV><FONT face=Arial>Dear Darius</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Firstly, I am assuming that you are measuring moisture %
on the "Wet basis"., ie, 1000 kg of "wet" wood would have </FONT></DIV>
<DIV><FONT face=Arial>250/1000 = 25% moisture content Wet basis, WB, or 250 kG
of water content. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>If you dry to 20% moisture content WB, you will have a
"final moisture content" of .20 x 1000 = 200 kG water. You thus have to remove
250 - 200 = 50 kG water per tonne dried from 25% moisture WB to 20% moisture
WB.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Each kG of water that you remove will probably need
in the order of 1.2 kw-hr of thermal energy per kG of water "boiled off ". A
tonne of wood feed at 25% moisture would need about 50x1.2 = 60 kw-hr to remove
the required water from one tonne of wood feed. The wood will come out hot
also... 950 kg of wood raised from say 20 C to 80 C would need about
</FONT></DIV>
<DIV><FONT face=Arial>23 kw-hr of heat energy to raise the temperature of the
wood. Total would be about 85 kw-hr per tonne of wood feed. 10 tonnes would thus
require about 850 kw-hr of "input energy."</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>For simplicity, assume that ambient air is 100% saturated.
Say tropic conditions of 30 C and 100% RH. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>850 kw-hr of thermal energy could be attained from wood
that was burned at 80% efficiency; in this case "input energy would have to be
about 850/.8 = 1063 kw-hr of "input energy." If the input wood had a moisture
content of say 30%, then its heat content per pound of "as received" sawdust and
bark would be about 14 MJ/kG, or 3.9 kw-hr per kg, indicating that you would
have to burn about 850/3.9 = 218 kG of wood over the drying period. If you
operated for 8 hours per day, you would need to burn about 27.24 kg of wood fuel
per hour.... say about 30 kg/hr.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I would suggest that you take the flue gases and mix with
ambient air, to have a "delivery temperature" of about 100 C, and blow it into
your drier system. You have to be careful that you don't draw sparks from your
combustion system, that could set your drying wood on fire. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>At this point, you have "adequate" hot air" to dry your
wood chips. You could dry the "feed from the chipper" at say 10 Tonnes per hour,
or you could pre-screen the chips, so that you only dried the chips that were
sized to the desired final size range. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Best wishes,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Kevin Chisholm</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=darius_tamizi@hotmail.com
href="mailto:darius_tamizi@hotmail.com">darius_tamizi</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=Doug.Williams@orcon.net.nz
href="mailto:Doug.Williams@orcon.net.nz">Doug</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A
title=gasification@lists.bioenergylists.org
href="mailto:gasification@lists.bioenergylists.org">Discussion of biomass
pyrolysis and gasification</A> ; <A title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">Discussion of biomass cooking
stoves</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, January 24, 2014 8:00
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Gasification] Mk2 Chip
Guillotine</DIV>
<DIV><BR></DIV>
<DIV>Dear Doug, Kevin,</DIV>
<DIV><BR></DIV>
<DIV>We need to dry 10ton of wood chip daily (all kind of tropical
wood).</DIV>
<DIV><BR></DIV>
<DIV>We can burn Bark, sawdust and biochar as the heat source.</DIV>
<DIV><BR></DIV>
<DIV>Today we are using waste heat from the gasifier for drying the woodChip.
For drying 1ton of woodchip from 25% to 20% we need 4-8 hours with the system.
It is too slow.</DIV>
<DIV><BR></DIV>
<DIV>Regards,</DIV>
<DIV><BR></DIV>
<DIV>Darius</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>
<DIV style="COLOR: #575757; FONT-SIZE: 75%">Terkirim dari Samsung
Mobile</DIV></DIV><BR><BR><BR>-------- Original message --------<BR>From: Doug
<<A
href="mailto:Doug.Williams@orcon.net.nz">Doug.Williams@orcon.net.nz</A>>
<BR>Date: 24/01/2014 14:26 (GMT+07:00) <BR>To: darius_tamizi <<A
href="mailto:darius_tamizi@hotmail.com">darius_tamizi@hotmail.com</A>>
<BR>Cc: Discussion of biomass pyrolysis and gasification
<gasification@lists.bioenergylists.org>,Discussion of biomass cooking
stoves <stoves@lists.bioenergylists.org> <BR>Subject: Re: [Gasification]
Mk2 Chip Guillotine <BR><BR><BR><BR>Darius, <BR><BR>You are a man of few
words, or do they charge by the word for your phone(:-)<BR><BR>What quantity
are you talking about? <BR><BR>Biomass type wood/bamboo/brush
wood,etc.<BR><BR>Do you have any heat available?<BR><BR>How do you currently
dry chips?<BR><BR>Scale is every thing, so simple cheap answers may not be
available.<BR><BR>Doug.<BR><BR><BR><BR>On Fri, 24 Jan 2014 12:44:52
+0700<BR>darius_tamizi <darius_tamizi@hotmail.com> wrote:<BR><BR>>
Dear Doug,<BR>> <BR>> The humidity here is 80% and more.<BR>>
<BR>> Darius<BR>
<P>
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