[Stoves] Secondary combustion.

rongretlarson at comcast.net rongretlarson at comcast.net
Mon Aug 1 15:02:24 PDT 2011

John (cc list): 

What percentage of these industrial gas furnaces that you deal with use preheating of the combustion air? 


Is this a totally different question than when working with biomass and pyrolysis? (or coal/coke in SA?) 


----- Original Message -----
From: "John Davies" <jmdavies at telkomsa.net> 
To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org> 
Sent: Sunday, July 31, 2011 11:22:03 PM 
Subject: [Stoves] Secondary combustion. 

Dear Tom and all. 

I work with industrial gas furnaces, 

Some use a mixture of gasses with H2, CO, CO2, CH4 with traces of C2's to 
C4'4's. - with a HV as low as 16 MJ/m3. Others burn Natural gas with a HV 
of 40 MJ/m3. Some have preheated air and some do not. 

All run with a minimum of excess air, with about 1.5 to 2% O2 in the flue 
gas and very low CO. 

The common factor in all these flames is the 3 T's . Turbulence, 
temperature and time. All having turbulent mixing, A well insulated 
combustion chamber, and a large area for the flame to burn to completion. 

This is the scenario that we need to try and emulate as far as possible in 
the secondary flame of our stoves. How close we can get to this is the big 

John Davies 

-----Original Message----- 

From: stoves-bounces at lists.bioenergylists.org 
[mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Thomas Reed 
Sent: 31 July 2011 01:38 PM 
To: stoves at lists.bioenergylists.org; Paul Anderson; Hugh McLaughlin 
Cc: stoves at lists.bioenergylists.org 
Subject: Re: [Stoves] Stoves Digest, Vol 11, Issue 38 

Crispin and All 

Let's explore the plus and minus of preheating secondary air. 

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