[Stoves] Secondary combustion.

[John Davies]

Greetings Ron and all,

 

A very small percentage use preheated air, One I know heats to 300C. All about recycling heat, leading to lower fuel use.

 

Perhaps Crispin can give us an estimate on the excess air that gives 2% O2 in the flue gas.

 

I do not believe that the fuel plays such an important role. All about the 3 T’s. and allowing the flame to burn to completion. Obviously the size plays a very big role, The little furnaces in our stoves have a very large surface area in the combustion chamber relative to the heat generation. They also tend to have a short flame area, with little or no insulation. 

 

In reality we cannot emulate the industrial furnace, but we can learn from it.

 

I do accept that biomass has a moisture content in the unburned gas, but we should look at industrial biomass furnaces for pointers, I believe that there a many in 1st world countries.

 

Keep up the good work,

 

John.

 

From: stoves-bounces at lists.bioenergylists.org [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of rongretlarson at comcast.net
Sent: 02 August 2011 12:02 AM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Secondary combustion.

 

John  (cc list):

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

And

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

Ron

  _____  

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.




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