[Gasification] Gasification of briquettes

[linvent at aol.com]

The solution is to build a gasifier which will accept other than hard, 
large materials. We have done this and the feeder actually breaks up 
any pelleted materials that are fed into it. The gas cleaning train 
will remove all of the tars, oils, particulate down to the dewpoint and 
along with a low enough dewpoint, the moisture and organics which carry 
over into the engine if not done right. Otherwise, the gasifier will 
have very limited range feedstock acceptability and issues with long 
term engine operation.
Sincerely,
Leland T. "Tom" Taylor
President
Thermogenics Inc.

-----Original Message-----
From: doug.williams <Doug.Williams at orcon.net.nz>
To: Discussion of biomass pyrolysis and gasification 
<gasification at lists.bioenergylists.org>
Sent: Sat, Feb 12, 2011 9:24 pm
Subject: Re: [Gasification] Gasification of briquettes

John,Jim, and Colleagues,

john, this is a hard problem, but there are some partial fixes that
might get things to tolerable.  it can likely be solved without a 50k
extruder or giving up.
 
Jim offers some interesting possibilities, and quite tempting if no 
explanation was forthcoming. I have explained the cause, and the 
briquette still has to turn to carbon, no matter how you get the 
briquette to the carbonizing temperatures which expands the individual 
compressed fines. Binders would help if you have buckets of tar to get 
rid off, but this is not the case in John situation, explained to me in 
a separate earlier communication, that I missed in my early scan of my 
in-box.
 
For those wanting to explore thermal bonded briquetting of the type 
that improves their chances for gasification, refer to this forum 
archive:    http://www.bioenergylists.org/en/retasiabriquette  They are 
very DIY, and would be cheap to any healthy scavenger of recycled 
materials.
 
Jims final question:
 
what happened to the high resin block fuels?
 
His user changed over to compresses combustion fuel 
briquettes.manufacture.
 
High resin block fuels as you refer to them, can cover most species of 
conifers (pines), although some seem to have more resin when cut green. 
If the gasifier is designed for these soft woods,  which require 
smaller dimensions, everything passing through the bed carbonizes. The 
larger dimensioned hardwood block gasifiers cannot handle conifer 
blocks, and is why many in Europe get into tar problems, using WW2 
design parameters, but not sticking to the regulated fuel 
specifications of that era.
 
isn't gasification fun?

I can only concur that when you stop learning, you also stop 
breathing.(:-)
 
Hope this provides more understanding.
Doug Williams,
Fluidyne._______________________________________________
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