[Stoves] RE: Charcoal Rocket

[Crispin at newdawn.sz]

Dear Dean

I can't see what the CO ppm reading has to do with indicating a clean burn
unless it is rated against either the CO2 level or the excess air.

It could be showing that there is a large EA level followed by a low
level as the charcoal burns at a high rate and then a large one again as the
combustion nearly stops and the heat in the system continues to drive air
through the chimney.

It is clear that the insulating chimney is beneficial to the burn but not to
what extent.  Using preheated air may also promote flaming to burn the CO
without the use of any extra draft at all.  It is important to establish
whether the draft is diluting the CO with cold air, or causing it to burn in
a CO2-rich atmosphere.  Flames high in such a tall tube indicate to me it is 
short of air but that might be because of the large fuel load all burning at 
once.

A clean burn is indicated by a low co/CO2 ratio. What is the reading?

Regards
Crispin

----- Original Message ----- 
From: "Dean Still" <dstill at epud.net>
To: <STOVES at LISTSERV.REPP.ORG>
Sent: Thursday, June 22, 2006 7:02 AM
Subject: RE: [Stoves] Charcoal Rocket


Dear Kevin,

Didn't see the rest of your message.

The photos are of the same stove used in the video.

We have run the stove 4 times under the emissions hood. Each time the CO
eventually goes down to under 10ppm. I guess that this happens when the
temperature gets up high enough in the chimney above the burning charcoal?
The rate of burn changes depending, I think, on whether the top of the pile
lights or whether, as in the video, the entire pile lights at the same time.

Best,

Dean



___________________________________________________________
$0 Web Hosting with up to 200MB web space, 1000 MB Transfer
10 Personalized POP and Web E-mail Accounts, and much more.
Signup at www.doteasy.com