Dear Tom Reed,
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.
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.
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.
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from wood gasification had been replaced by benzene when the coals were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.
Cheers,
Peter
Managing Director
ID Gasifiers Pty Ltd
Australia
On 24/05/2015 4:17 AM, Tom Reed wrote:
Dear Thomas Koch and ALL:
Thomas asks a very interesting question. Best answer would be for
someone (me?) to get a batch of coal and try it.
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.
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.
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...
TOM REED
Thomas B Reed
280 Hardwick Rd
Barre, MA 01005
508 353 7841
On May 22, 2015, at 11:51 AM, Thomas Koch <[email protected]
<mailto:[email protected]>> wrote:
Hi Saiteja
That depends very much on which principle of gasifier you are using.
If you use an entrained flow gasifier the only real difference is the
pretreatment equipment.
Best regards
Thomas Koch
*Fra:*Gasification
[mailto:[email protected]] *På vegne af
*Saiteja Chinta
*Sendt:* 22. maj 2015 20:28
*Til:* [email protected]
<mailto:[email protected]>
*Emne:* [Gasification] Difference between Coal and biomass gasification
Hi,
I want to know what would be major design variations while designing
for gasifiers which are coal fed from that of biomass.
Thanks
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--
Peter Davies
Director
ID Gasifiers Pty Ltd
Delegate River, Victoria
Australia
Ph: 0402 845 295
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