[Stoves] 40% yield of charcoal

[adkarve]

Dear Crispin,
I am not a chemical technologist, so I may not be able to answer your
questions correctly. Our oven-and-retort kiln yields about 33% char. That
means that the volatile content of the biomass is about 67%.  40% yield of
char means that about 10% of the original volatiles are prevented from
escaping from the char due to the pressure exerted on the biomass. I don't
think that it is blackened biomass. It would be char, containing about 10%
of the original volatiles in the biomass. Even mineral coal contains
volatiles, making it necessary to heat it in a coking oven in order to
remove them.
Yours
A.D.Karve

----- Original Message -----
From: Crispin Pemberton-Pigott <crispinpigott at gmail.com>
To: Discussion of biomass cooking stoves <stoves at listserv.repp.org>
Sent: Saturday, June 09, 2007 7:21 PM
Subject: Re: [Stoves] 40% yield of charcoal


> Dear AD
>
> Do you think the 40% charcoal has a high volatility level, or are the
> volatiles converted to other forms with the 'volatile' carbon not becoming
> attached to the 'char' carbon?  If you get my meaning...
>
> It seems odd that so much of the volatiles would be retained in something
> still called 'charcoal' which is sort of defined as biomass with the
> volatiles driven off.  It seems it would be 'a fuel that is blackened'
> because if it is still replete with most of the original volatile content
it
> is something else.
>
> I would be really interested in find some of the fuel to try in a couple
of
> stoves.
>
> I understand that the pressure in the container is 6 bars.  One
contributor
> to this list mentioned charcoaling a 12" diameter log 5 feet long in
> something like 90 minutes. It must churn out a heck of a lot of heat and
gas
> to accomplish that!  Is not the inventor a subscriber to this list?
>
> Regards
> Crispin
>
> ----- Original Message -----
> From: "Tom Miles" <tmiles at trmiles.com>
> To: "'Discussion of biomass cooking stoves'" <stoves at listserv.repp.org>
> Cc: "'Priyadarshini Karve'" <priyadarshini.karve at gmail.com>
> Sent: Saturday, June 09, 2007 1:05 PM
> Subject: Re: [Stoves] 40% yield of charcoal
>
>
> AD
>
> A stove that can burn a high volatile fuel should be able to burn this 40%
> yield char.
>
> Tom Miles
>
>
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