[Gasification] Gasification Digest, Vol 8, Issue 6

[thomas reed]

Dear Ron and all

A few comments on Ron's questions.

Woody biomass is typically 15-25% lignin and the balance is cellulose
and hemicellulose.  In cellulose all the carbons are attached to -OH
or =O and so come off during pyrolysis as CO or CO2.

Lignin has a benzene ring and is a  hydrocarbon polymer based on
coniferyl or other alcohols monomers.  As such iti is not easily
digested by microorganisms, and fallen trees in the forest rot leaving
"lignin logs".   They fall apart when you kick them because the
longitudinal cellulose fibers are gone.  Lignin's the precursor for
charcoal and dictates the ~20% yield of charcoal from most trees.
(Mesquite has 64% lignin and yields 30-40% charcoal.)

Lignin was the precursor of all the coal in the world.  It evolved
about 360 million years ago and made possible the enormous vascular
trees that became fossilized as coal.

Some charring processes yield more than 20%, but typically contain
recondensed tars reabsorbed during manufacture.

It is unfortunate that we don't have more analyses on the chemical
composition of tars from each process.

Tom Reed, Pyrologist

On Monday, April 11, 2011, Ron Larson <rongretlarson at comcast.net> wrote:
> List:
>
>    To Tom's list, I'd like to add
>
> 8.  What is the range (especially the upper limit) of weight percent char that is possible with each device?  (It seems pretty high with the GEK)
>
> Ron
>
> Sent from my iPad
>
> On Apr 11, 2011, at 1:00 PM, gasification-request at lists.bioenergylists.org wrote:
>
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>> Today's Topics:
>>
>>   1. Re: under 1MWe biomass CHP (Tom Miles)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Mon, 11 Apr 2011 08:31:27 -0700
>> From: "Tom Miles" <tmiles at trmiles.com>
>> To: "'Discussion of biomass pyrolysis and gasification'"
>>    <gasification at lists.bioenergylists.org>, <tombreed2009 at gmail.com>
>> Subject: Re: [Gasification] under 1MWe biomass CHP
>> Message-ID: <004d01cbf85d$87f57ad0$97e07070$@com>
>> Content-Type: text/plain; charset="iso-8859-2"
>>
>> Gero,
>>
>>
>>
>> Questions for you and other gasifier suppliers:
>>
>>
>>
>> 1. What is the current population of your operating gasifiers?
>>
>> 2. Specifically, where are they?
>>
>> 3. What fuels do they use?
>>
>> 4. What is their peak operating capacity? (kWe/kWhth)
>>
>> 5. At what capacity are they typically operated? (KWe/KWhth)
>>
>> 6. What is their typical capacity factor (operating hours per year at full
>> load equivalent(kWe)/8760 hours)
>>
>> 7. What new projects are in the pipeline? Or, where is the industry headed?
>> More small scale? Mini-grid? Higher capacity?
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Tom
>>
>>
>>
>> T R Miles Technical Consultants, Inc.
>>
>> Portland, OR USA
>>
>> tmiles at trmiles.com
>>
>> www.trmiles.com
>>
>> www.gasifiers.bioenergylists.org
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> From: gasification-bounces at lists.bioenergylists.org
>> [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Gero
>> Eckermann
>> Sent: Sunday, April 10, 2011 10:36 PM
>> To: 'Discussion of biomass pyrolysis and gasification';
>> tombreed2009 at gmail.com
>> Subject: Re: [Gasification] under 1MWe biomass CHP
>>
>>
>>
>> Hi Tom,
>>
>>
>>
>> I have also been corresponding with Pawel regarding our System Johansson
>> Gasproducers.
>>
>> Herewith an update for you: Attached is the self-explanatory accolade for
>> 2010 from Frost & Sullivan, UK.
>>
>>
>>
>> Kind regards,
>>
>> Gero
>>
>> CARBO CONSULT & ENGINEERING (Pty) LTD
>>
>>
>>
>>
>>
>>  _____
>>
>> From: Thomas Reed [mailto:tombreed2009 at gmail.com]
>> Sent: 09 April 2011 10:25 PM
>> To: Discussion of biomass pyrolysis and gasification
>> Subject: Re: [Gasification] under 1MWe biomass CHP
>>
>>
>>
>> Pawel
>>
>> Community Power makes a CHP 100 kW unit, see www.gocpc.com.
>>
>> All Power Labs, Jim Mason, (Berkeley) makes a 10 kW power supply.  The heat
>> would be easy to add.
>>
>> TOM REED
>>
>> 2011/4/4 Pawe? Paszkiewicz <p.paszkiewicz at openenergy.com.pl>
>>
>> Hello,
>> To all members that could help.
>> What's the most proven under 1MWe biomass CHP plant provider in your
>> opinion?
>> Please share your experience on efficiency/costs/sustainability.
>>
>> All best from a newbie.
>> Pawel
>>
>> Pawe? Paszkiewicz
>> Doradca Klienta Korporacyjnego
>>
>> tel.: +48 728 214 186 <tel:%2B48%20728%20214%20186>
>> www.openenergy.com.pl <http://www.openenergy.com.pl/>
>>
>>
>> ul. Niemierzy?ska 17a, 71-441 Szczecin
>> tel.: +48 (91) 852 20 01 <tel:%2B48%20%2891%29%20852%2020%2001> , fax: +48
>> (91) 852 20 03 <tel:%2B48%20%2891%29%20852%2020%2003>
>> NIP: 851-313-52-35, Regon: 320926340, KRS: 0000370255
>>
>>
>>
>>
>>
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>> End of Gasification Digest, Vol 8, Issue 6
>> ******************************************
>
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-- 
NOTE:  PLEASE CHANGE MY ADDRESS TO TOMBREED2010 at GMAIL.COM

Dr. Thomas B. Reed
The Biomass Energy Foundation
BEF, BEC, BER