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Dear Tom Reed,<br>
<br>
We have successfully gasified run-of-mine black coal (30% ash, 3%mc)
crushed to >30mm piece sizes, and both brown coal briquettes and
run of mine (but dried <10%mc) fine lignite material in our
design of down draft system.<br>
<br>
The brown coal behaves very similar to wood chips in the system,
with similar gas qualities, the fine lignite was very pleasing as
apart from a very vigorous clean flare it resulted in a high
recovery of carbonised material suitable for briquetting as a co
product, this was tested in Melbourne for this purpose with
excellent results and found to need less binder than other
carbonised product they normally worked with. <br>
<br>
The black coal needed more air and had lower H2 content of the gas
but still worked well, obviously introducing some steam would also
improve outcomes here. We did not find either coals raised
temperatures significantly in the gasifier, rather the higher
density types simply took longer on a volume basis. We found the
biggest problem was with the high ash black coal the inorganic
components are not evenly distributed, not every black piece was
coal and some of the rock like bits were just that, rocks! Hence the
need to crush (for our system) to sub 30mm piece size so that the
stuff that doesn't gasify will still go through our active grate and
not create blockages.<br>
<br>
The only other change of note discovered during earlier testing was
where some condensate (light tars) was recovered in the built for
purpose trap, testing showed that the pyridine component normally
found from wood gasification had been replaced by benzene when the
coals were gasified. I would be interested in your comments on this.<br>
<br>
Cheers,<br>
Peter<br>
Managing Director<br>
ID Gasifiers Pty Ltd<br>
Australia<br>
<br>
<div class="moz-cite-prefix">On 24/05/2015 4:17 AM, Tom Reed wrote:<br>
</div>
<blockquote
cite="mid:E7451156-5299-4A80-9640-30EAE9116D08@gmail.com"
type="cite">
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<div>Dear Thomas Koch and ALL:</div>
<div><br>
</div>
<div>Thomas asks a very interesting question. Best answer would
be for someone (me?) to get a batch of coal and try it. </div>
<div><br>
</div>
<div>First, I would expect that it m i g h t burn up the
gasifier. Coal burns so much hotter than wood. But I hope the
stainless steel can stand it.</div>
<div><br>
</div>
<div>Secondly it would burn twice as long due to the high density
of the coal and the high volatile content which could keep it
from burning up.</div>
<div><br>
</div>
<div>I hope someone will try it and give a report. I'm on the
road, but will try it when I get home if no one else does...</div>
<div><br>
</div>
<div>TOM REED<br>
<br>
Thomas B Reed<span class="Apple-style-span"
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</div>
<div><br>
On May 22, 2015, at 11:51 AM, Thomas Koch <<a
moz-do-not-send="true" href="mailto:tk@tke.dk">tk@tke.dk</a>>
wrote:<br>
<br>
</div>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Saiteja
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">That depends very much on which principle
of gasifier you are using.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">If you use an entrained flow gasifier the
only real difference is the pretreatment equipment.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Thomas Koch<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Fra:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Gasification [<a moz-do-not-send="true"
href="mailto:gasification-bounces@lists.bioenergylists.org">mailto:gasification-bounces@lists.bioenergylists.org</a>]
<b>På vegne af </b>Saiteja Chinta<br>
<b>Sendt:</b> 22. maj 2015 20:28<br>
<b>Til:</b> <a moz-do-not-send="true"
href="mailto:Gasification@bioenergylists.org">Gasification@bioenergylists.org</a><br>
<b>Emne:</b> [Gasification] Difference between Coal and
biomass gasification<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p>Hi,<o:p></o:p></p>
<p>I want to know what would be major design variations
while designing for gasifiers which are coal fed from
that of biomass.<o:p></o:p></p>
<p>Thanks<o:p></o:p></p>
</div>
</div>
</div>
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<pre wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
Peter Davies
Director
ID Gasifiers Pty Ltd
Delegate River, Victoria
Australia
Ph: 0402 845 295</pre>
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