reducing flame temperature of gases

[Tim1648]

Hi,

is there a way to obtain a flame temperature of gases with lets say 300-600°C ? I found out alkanes for ex. butane, propane have a much lower combustile temperature than oxygene related. Can a gas be mixed with some sort of chemical to keep it that low on heat?

thanx for help
Timmy

 

[JStephen]

Do you mean the temperature generated when it burns, or the temperature it takes to ignite it?

If the former, you should be able to increase the air amount (to a point) and lower the temperature. Or mix air with the products immediately after combustion to lower the temperature.

What are you trying to accomplish?

 

[Tim1648]

Hi JStephen,

thanks for your answer and help. I thought of reducing generated combustion temperature...nice to be understood even when things not clear .

I just had in mind of treating heat sensitive materials like plastics and stuff. So at least the max temperature should be in this range somehow i suggested. What will happen when
mixing propane/butane and nitrogen? Because alkanes i have learned have less cohesive energy or is that wrong? What if not propane but propene is used..an unsatturated gas? Will that change much?

greetings
Timmy

 

[IRstuff]

Air is already 78% nitrogen and you have to have oxygen to get butane to burn. Anything less than stoichiometric will result in soot and residue on the work piece.

The breaking of bonds is only one aspect of the energy balance. The other is the energy released in the formation of carbon dioxide and water.

The simplese solution was already mentioned in your other thread, which is to simply mix the output with cooler air

TTFN