[Stoves] Bagasse Gasification

[Tom Miles]

The alkali is highly soluble and will substantially be removed with the
water. In Hawaii the water is returned to the fields.   UCD or HNEI may have
done some chemical fractionation analysis for bagasse which would show the
percentages of alkali removed by water, dilute acid, strong acid and
residue.  Chemical fractionation is described in or 1995 report, "Alkali
Deposits in Biomass Power Plants"
http://www.trmiles.com/alkali/Alkali_Report.pdf   (4mb) and is now routinely
used to characterize volatile alkali in biomass fuels for evaluating
potential fouling.   We did not study bagasse or trash (tops and leaves) in
that study. Find work by Bryan Jenkins at UC Davis (California) or Scott
Turn and HNEI (Hawaii).

 

Tom

 

From: A.Saravanakumar [mailto:sara_mnes at rediffmail.com] 
Sent: Tuesday, July 24, 2007 10:39 PM
To: Tom Miles
Cc: stoves at listserv.repp.org
Subject: Re: RE: [Stoves] Bagasse Gasification

 

  
Dear Dr. Tom and all...

I render my thankfulness to your comments. Your weblink gave a clear picture
to my doubts. But, still I need some more clarification in this regard.

During the washing or leaching of sugar from cane (in milling process)...
"What happens to the alkalis? (will it wash away with the water or retain in
the bagasse itself. What will be the percentage of composition and of what
form will it be? Solid/Liquid/gas).

A. Saravanakumar



On Tue, 24 Jul 2007 Tom Miles wrote :
>A. Saravanakumar,
>
>This is more appropriate to the gasification list but it also relates to
>stoves.
>
>It is always best to do your own sampling and send the samples for
analysis.
>
>
>ARTI is carbonizing the tops and leave, or trash, which has high
percentages
>of alkali. If you gasify the same tops and leaves in a tight reactor the
>alkali will likely volatilize or melt.
>
>Reg Preston is probably gasifying hand crushed cane which may not be
>leached. Even so the ash content of the crushed cane is lower than in the
>tops and leaves and the alkali impact may be low. He hasn't reported any
>problems.
>
>Milled and washed cane in a sugar mill contains very low ash and very
little
>alkali. Ash in bagasse we have gasified is clay from soil either processed
>or picked up in storing the bagasse on the ground and loading it to the
>gasifier.
>
>You can see one analysis on my website at:
>http://www.trmiles.com/alkali/fuelsc5.html
>
>I didn't find any ash elemental analyses in entries on the Phyllis
database:
>http://www.ecn.nl/phyllis/
>
>There are ash elemental analyses in work by scott Turn and Charles
Kinoshita
>in Hawaii (HNEI), UC Davis (Bryan Jenkins) or James Joyce in Australia.
>Scott did leaching tests some years ago for sugar cane tops and leaves and
>banagrass.
>
>Tom
>
>
>
>
> > -----Original Message-----
> > From: stoves-bounces at listserv.repp.org [mailto:stoves-
> > bounces at listserv.repp.org] On Behalf Of A.Saravanakumar
> > Sent: Tuesday, July 24, 2007 6:07 AM
> > To: stoves at listserv.repp.org
> > Subject: [Stoves] Bagasse Gasification
> >
> > Dear ALL,
> >
> > I am working on bagasse gasification technology. I recently visited a
> > sugar industry and observed the process, I got confused in some initial
> > process of sugar cane processing.
> >
> > My question is:
> >
> > "During milling process of sugar cane does Na, K, and Ca gets leached
> > or does it goes along with bagasse even after repeated hot water
> > washing.
> >
> > What are the percentages of Na, K and Ca for sugar cane leaching
> > process?
> >
> > A. Saravanakumar
> >
> >
> >
> >
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>