[Gasification] Effect of Moisture Content on Gasification Efficiency in D...

[thomas reed]

Gasification:

Surprisingly, it is possibly for wood to be TOO DRY for some applications.

In a box (Franklin) stove, wood normally burns at a constant rate,
consuming the incoming air in the first wood encountered.

However, if it is bone dry, the whole log heats up and pyrolyses in the
first few minutes of operation.

10% moisture is sufficient to ensure that the log/logs burn in the
cigarette mode, starting at the end closest to air entry, and proceeding
along the log in an orderly fashion.

I can imagine that in the TLUD stove, particularly with pellets, too dry a
fuel could cause the reaction zone to advance along the easiest thermal
path, resulting in an unstable flame front.

It seems counterintuitive to think wood can be TOO DRY, but this is at
least one case....

COMMENTS?

TOM REED (on his new CHROME laptop)...


On Wed, Apr 2, 2014 at 11:34 AM, Jeff Coleman <jeff.coleman at iccgroup.ca>wrote:

> Hi all (first reply),
>
>
>
> GFWHELL - If you were referring to the Ultimate Analysis table, you'll
> need to shift all of the numbers in the right columns down one row.
>
> There must have been a mistake when converting the file to pdf.
>
> Also, the Proximate and Ultimate analysis are of the fuel, not the process
> gas. This is why Nitrogen levels are not high - they aren't affected by the
> gasification air at this stage.
>
>
>
> Hope this helps - interesting none the less!
>
>
>
> Thanks,
>
> *Jeff*
>
>
>
>
>
> *From:* Gasification [mailto:gasification-bounces at lists.bioenergylists.org]
> *On Behalf Of *GFWHELL at aol.com
> *Sent:* April-01-14 5:08 PM
> *To:* gasification at lists.bioenergylists.org
> *Subject:* Re: [Gasification] Effect of Moisture Content on Gasification
> Efficiency in D...
>
>
>
> This system seems to be using "atmospheric air' for Pyrolysis,  The gas
> produced seems to contain a remarkably low content of nitrogen and a very
> high sulphur content. is this a "typo"
>
>
>
> GFWHELL.
>
>
>
>
>
>
>
>
>
>
>
>
>
> In a message dated 4/1/2014 10:49:44 A.M. Eastern Daylight Time,
> tmiles at trmiles.com writes:
>
> Effect of Moisture Content on Gasification Efficiency in Down Draft
> Gasifier
>
>
>
> Hitesh Kumar, Dr Prashant Baredar, Dr Pankaj Agrawal, Dr S.C.Soni[
>
>
>
> *Abstract :- Biomass gasification is used to generate producer gas for the
> sustainable development. Now a days down draft*
>
> *gasifier is most widely used due to its characteristics like non
> production of tar production. Presently in India, few biomass*
>
> *based power plants are in use because of lack of knowledge and
> promotional policies of Government. Proper knowledge is*
>
> *essential for the smooth operation of biomass based power plant in full
> capacity. The main objective of the present study is*
>
> *to focus on the effect of moisture content on the gasification efficiency
> out of several influencing parameters of gasification*
>
> *technology.*
>
>
>
> International Journal of Scientific Engineering and Technology  (ISSN :
> 2277-1581) Volume No.3 Issue No.4, pp : 411-413 1 April 2104
>
>
>
> http://ijset.com/ijset/publication/v3s4/IJSET_2014_423.pdf
>
>
>
>
>
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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
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