[Stoves] burning saw dust

[Crispin Pemberton-Pigott]

Dear Roger

What do you think of the MTS as a sawdust burner?

Rajan: if I get a chance I will test it....wait, I don't have one here! Oh.
Well, next time I get one I will be able to test it with crushed 5mm pellets
which won't burn in just about any stove. What a terrible fuel.

As Christa mentioned, the stove has a circular rim full of fuel that needs
to be tapped to feed more fuel in. At the same time the vibration causes the
ash to fall out of the bottom. Depending on the way the bottom air enters
(i.e. Roger's original from Gambia or my version of it) the amount of char
is quite different, mixed in the ash that falls out. So it can be made to be
a pyrolyser or a gasifier depending on the handling of primary air entry.

It requires much more attention than an open fire with large fuel because if
you don't pay some attention to the fuel level it will eventually burn
through the ring of fuel at some point which lets in way too much air. That
shows the fuel needs to be relatively dense to choke the airflow through it,
and that the fire is operating in a negative pressure zone . Both are
advantageous.

Paul in Vietnam recently added a secondary air preheating tube passing
through the pyrolysing zone. The MTS has the same arrangement except Roger
uses two tubes. I tried it with one and it was also successful.

There is every reason to expect that the MTS layout will burn sawdust
properly if the lack of air flowing through the fuel can be compensated for
by increasing (for example) the primary air supply at the bottom. What would
be difficult would the ability to burn (well) a wide range of sawdust from
shavings to powder. The air supply would be continuously changing so
gasification would be hard to make constant.

Regards
Crispin


+++++

Dear Crispin,

-------------- Original Message ------------------------
>
> Message: 2
> Date: Wed, 12 Oct 2011 11:19:02 -0400
> From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
> To: <rajan_jiby at dataone.in>, "'Discussion of biomass cooking stoves'"
> <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] burning rice husk
> Message-ID: <037f01cc88f2$53782e30$fa688a90$@gmail.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Dear Rajan
>
> One stove that burns whole rice hull efficiently is the Mayon Turbo Stove.

Can this stove burn saw dust also ?

Regards,

Rajan 


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