Thanks for the comments, guys.
I don't think a static mixer with tabs around the circumference will be enough in this case because of the large diameter of the duct. If they don't protrude too much they probably don't have much mixing effect?
We thought about cooling the gas with water but...
Does anyone have any suggestions as to how to effectively mix low pressure gases in a large duct (3 to 4 metre diamter) without a large pressure drop? Hot products of combustion from a vertical up-fired burner i.e. CO2, water vapour, nitrogen and some excess air are surrounded by ambient air...
The air purge time should be enough to ensure the gas composition in the combustion spaces or any part that gets hot (i.e. ducting and stack) is below the LEL.
The problem with a natural draught incinerator is that there may be no positive air flow through the system when it is cold and...
Have you thought about a proprietary hand-held HE igniter? Chentronics in Norwich, NY make a neat hand-held battery operated unit called the Motivator - see their web-site: http://www.chentronics.com/Motivator.html
