[Stoves] why can't we use wood gas directly in an i.c. engine?

[Anand Karve]

Dear Crispin,
thanks for the input. Perhaps we can mix that catalytic soil with biomass
while making biomass briquettes, and then gasify them. Priya, my
daughter, made briquettes in her undergraduate physics project in the late
eighties, by mixing our local soil with biomass.  The water boiling test
revealed that her briquettes had greater efficiency than briquettes without
the soil.
Yours
A.D.Karve
On Sat, Oct 5, 2013 at 10:28 AM, Crispin Pemberton-Pigott <
crispinpigott at gmail.com> wrote:

>  Dear AD****
>
> ** **
>
> I toured a few days ago a 250 kW gasifier built by YDD head Anton. It is a
> semi-fluidised bed palm oil waste processing unit with a very interesting
> split reactor, one side heated by steam. It has a ceramic catalyst that
> looks like clay sand. It produces virtually zero tar. The stuff normally
> ‘scrubbed’ or condensed or washed out is simply not there because it is
> fully reacted to gas.****
>
> ** **
>
> As to why it has to be removed from engine fuel? The longer the chain of
> the molecule (tars are long) the longer it takes to burn. In the
> time-temperature-turbulence equation, engines provide very little ‘time’.
> If the residence time is very short (which it is, inside an engine
> combustion chamber) it combusts incompletely, gumming up the piston.
> Anton’s system solves this by doing a better job of reacting it. The raw
> fuel is available in vast quantities.****
>
> ** **
>
> If you recall I sent some pictures last year of a 135 kW unit outside
> Battambang in Cambodia. Tom Miles says there are 220 or so of them in the
> country. It is an Indian design and produces waste products (black gunk)
> that are causing pollution problems. The answer of course is simply not to
> create the stuff. An interim treatment method is to dry it and feed the
> black stuff back into the process. But obviously the answer is to deal with
> it initial problem, not install subsystems to mitigate it.****
>
> ** **
>
> If you put the tarry gas into a 6/1 Lister engine at 500 RPM I think it
> would do well – better than in an 1800 RPM truck engine.****
>
> ** **
>
> Regards****
>
> Crispin****
>
> ** **
>
> ** **
>
> Dear Stovers,****
>
>  fuel in the form of a combustible gas seems to be a pre-requisite for an
> internal combustion engine. Even liquid fuels are atomised before
> introducing them into the cylinder of an i.c.engine. Wood gasifies when
> heated, but this gas is used in internal combustion engines only after
> filtering out the tar. Why is it necessary to filter out the tar? Tar is
> combustible and it is gaseous if the temperature is high. Stoves which
> provide secondary air with the help of a fan have shown that the wood gas
> can be completely burned, along with the tar, if enough air is provided to
> it. So why filter out the tar before using wood gas in an i.c.engine?****
>
> Yours****
>
> A.D.Karve****
>
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-- 
***
Dr. A.D. Karve
Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
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