[Stoves] Thickness of flame front - Vesto running on Switchgrass pellets

[Crispin Pemberton-Pigott]

Dear Grass Burners

Roger Samson was here today with Stephanie and he brought along a Mayon
Turbo stove with rice husks and a big bag of switchgrass pellets.

We tried this 'fuel of the future' in the Vesto which first required putting
a small sheet of newspaper at the bottom to keep the little pellets in, and
second perforating the sheet to let in a least a small amount of primary
air.

It was packed pretty tightly.  The pellets are about 15 MJ per litre.  

We lit it on top with a small wood fire and it got going nicely.  It burned
very much like a Vesto with the 'gasifier mode' engaged meaning that it ran
with very little primary air getting through and a floating bed of flame
perhaps 7 cm above the fuel. Very pretty.

The CO/CO2 ratio was stable at 2% and had no odour or visible smoke.  I will
get some picture posted and a movie with a description by Roger.

The flamefront was shallow, as Alex describes with wood pellets.  Nothing
really to add - it burned completely and gave off lots of heat.

Regards
Crispin

-----Original Message-----
Subject: Re: [Stoves] Thickness of flame front

[snip]
The reaction zone was  flat 
across the 45cm chamber diameter and the distance between raw wood pellets
and 
completely charred wood pellets (the reaction zone) was about 2cm. I don't
know how 
the depth changes with "speed".

Regards  Alex

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