Re: Down draft stoves are grate!

[Peter Verhaart <pverhaart@optusnet.com.au>]

At 16:07 3/01/02 -0600, you wrote:
>Hi,
>
>the shown DD BBQ did NOT have much of a hopper to hold the fuel, and, as 
>pointed out by Ron, does NOT have much control over the primary air supply 
>(except some adjustable grate that did not sound like much control, but I 
>might be wrong.)

Yes, you are. This is not a gasifier, it burns wood. I never mentioned a 
hopper, I did mention the fact that wood had to be added (almost) 
continuously in small quantities.
Being (used as) a barbecue, it is no great inconvenience to feed it.

The generated gases burn downstream from the grate, having just negotiated 
the brightly burning char, the excess air as well as the volatiles are 
fresh and hot and eager to burn which they do on their way from the grate 
to the box carrying the hot plate.

I have at times wondered if it would be useful to upload some more detailed 
pictures of the stove, any comment?

Peter Verhaart


>ALL of my work with the IDD gasifier focuses attention to the need to 
>control the primary air supply.
>
>Also, is it not possible that the generated gases are too far from the 
>flame to be continually ignited?  A concern with the IDD is a "flare-out" 
>loss of flame to ignite the gases, thus resulting in smoke that should be 
>consumed in the flames.  Is there an ignition method for the BBQ with the 
>DD fuel supply?
>
>Paul
>Paul S. Anderson, Ph.D.,  Fulbright Prof. to Mozambique 8/99 - 7/00
>Dept of Geography - Geology (Box 4400), Illinois State University
>Normal, IL  61790-4400   Voice:  309-438-7360;  FAX:  309-438-5310
>E-mail: psanders@ilstu.edu - Internet items: www.ilstu.edu/~psanders


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