[Gasification] [Digestion] composition of pyrolysis gas

[Anand Karve]

Dear Jeff,
thanks for the information. I am still not happy with the 18% nitrogen.
Where does it come from?
A.D.Karve

On Sat, Jan 29, 2011 at 10:10 AM, Jeff Davis <jeff0124 at velocity.net> wrote:

> Dear Dr. Karve,
>
>
> I did not see a percent composition in my book.
>
> But:
>
> Industrial charcoal making
> FAO FORESTRY PAPER 63
>
> "Thus it is difficult to give exact figures for gas composition and
> heating value. A typical retort gas could have the following composition
> by volume:- methane 17%, hydrogen 2%, carbon monoxide 23%, carbon
> dioxide 38%, oxygen 2% and nitrogen 18%. Offgas from rinsing gas retorts
> could be diluted more than its own volume with inert rinsing gas.
>
> The calorific value varies widely. Undiluted retort gas has a calorific
> value of about 11 MJ/m³ but would be less than half this when diluted
> with inert rinsing gas being approximately equal to producer gas. The
> gas will burn easily but the heat output is limited. For every tonne of
> charcoal produced about 0.25 tonnes of non-condensable gas is produced
> having a heat content about 10% of that of the charcoal produced."
>
> <http://www.fao.org/docrep/x5555e/x5555e07.htm#TopOfPage>
>
> Also:
>
> "Approximately from one thousand kilograms of dry wood the following
> heat quantities are available in megajoules (MJ) in the final products.
>
> Charcoal 9500 MJ
>
> wood Gas 1500 MJ
>
> Condensibles including Tar 8000 MJ"
>
> <http://www.fao.org/docrep/X5555E/x5555e04.htm>
>
>
> And of course root:
>
> <http://www.fao.org/docrep/X5555E/x5555e00.htm#Contents>
>
>
> Best regards,
>
>
> Jeff
>
>
> On Tue, 2011-01-25 at 08:33 +0800, Anand Karve wrote:
> > Does your book contain the percentage composition of the fraction that
> > remains gaseous at room temperature (carbon dioxide, carbon monoxide,
> > hydrogen, methane and water vapour)? It is the gaseous fraction that
> > would serve as fuel analogous to biogas. The rest of the chemicals are
> > most probably components of the tar, which condenses at room
> > temperature. Yours A.D.Karve
>
>
>
>
>
>
> --
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-- 
***
Dr. A.D. Karve
President, Appropriate Rural Technology Institute (ARTI)

*Please change my email address in your records to: adkarve at gmail.com *
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