<br><br><div class="gmail_quote">On Sun, Nov 28, 2010 at 7:09 AM, Greg Manning <span dir="ltr"><<a href="mailto:a31ford@gmail.com">a31ford@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div>
<div><span><font face="Arial" size="2">OK, First off,
Greetings List(s)!</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">Second:</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2"> Since my
accidental discovery of smaller feedstock sizes about a week ago, I've been
doing some tests (ok, mad scientist stuff), to the acceptable "Minimum" size
level in my downdraft units.</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2"> For those that
do not know me, briefly, I build smaller downdraft gasifiers (under 250KwT) I do
NOT go bigger than that, I have my reasons.</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">I've been using a
"standard" sized woodchip, typical of most small industrial units (NOT your home
"shredder/mulchers") generally 15-30 hp units.</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">These chippers
produce, for the most part, chips about 3 x 3 x 0.25 cm chips (3/4 x 3/4 x
3/16") and down to the point of dirt, or mash.</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">6 - 7 years ago, I
had settled on a rotary screen design using a "fines" screen of 0.63
x 0.63 cm (1/4 x 1/4") square openings. this has been my "smaller"
size since then. (Until this week, we have always discarded
anything that was considered "fines", used these as mulch or horse
bedding).</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">Upon the somewhat
accidental use of a fines pile as feedstock, much to my surprise, the unit
accepted the fines for the most part, for about 8 hours of operation, (these
where raw fines, directly from under the rotary drum), Yes the gasifier did
eventually plug up and shut down BUT, not knowing what was going on at the time
(I did NOT know the unit was running on fines) I was perplexed as to what had
caused the problem, upon investigation, and finding that the worker had
inadvertently used this pile, instead of the correct one, and finding out the
length of the time the unit had ran on them, I undertook the new question of
"how small I can go" in feedstock sizes.</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">As it turns out, the
unit will run consistently on a much smaller chip size than originally thought.
We have since changed the fines screen in the rotary screener to 3/16" round
holes (punched panel) on an offset pattern (68% opening) the ratio change is as
follows:</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2"> Original 1/4 x
14" square openings, ratio of fines to acceptable feedstock 30% fines, 70%
feedstock</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2"> New
3/16" round openings, 10 - 13% fines, 87 - 90% acceptable.</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">Hoping that this
information is useful to someone.</font></span></div>
<div><span><font face="Arial" size="2">Kindest
regards: </font></span></div>
<p><font color="#0000ff" face="Arial" size="2">Greg Manning,</font> <br><font face="Arial"><font color="#0000ff" size="2">Canadian Gasifier Ltd.
(<a href="http://www.cangas.ca" target="_blank">www.cangas.ca</a>)</font></font><br><font color="#0000ff" face="Arial" size="2">Building
Hi-Pe</font><font color="#0000ff" face="Arial" size="2">r</font><font color="#0000ff" face="Arial" size="2">formance Gasifiers, Since</font> <font color="#0000ff" face="Arial" size="2">2001</font> <br><font face="Arial"> </font> <br>
<font color="#0000ff" face="Arial" size="2">Brandon, Manitoba, Canada</font> <br><font color="#0000ff" face="Arial" size="2">1 (204) 726-1851</font> <br><font face="Arial"> </font> </p>
<div> </div></div>
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