Emissivity of NH4OH in flame

[Nazli7]

Hi,

I'm trying to figure out the radiotion pattern of a a flare which burns NH3 and as the radiation is a function of emissivity factor I need to know the emissivity of NH4OH in the flame.

Can anyone help me?

Thanks

 

[Flareman]

Nazli7
I'm a little confused by the question. Ammonium hydroxide is just ammonia in water. If you are burning ammonia, where does the extra water come from. Even if you have some extra hydrocarbon to help the flammability, surely the amount of intermediate NH4OH is not going to be significant.
In the diffusion flame, radiant heat comes primarily from the transient solids and unsymmetrical molecules are secondary. There are no solids in a pure ammonia flame (if you can get it to burn). Allowing for radiated heat from the water produced (as well as transient ammonium hydroxide), the overall emissivity is likely to be less than 10%. Download my paper "Making the Flare Safe" from

http://www.geocities.com/flareman_xs

(main menu|Downloads). It has a formula to "Guesstimate" potential flare emissivity. You definitely need to include any support components containing carbon or sulfur.

David

 

[Nazli7]

David,

Thanks alot for the reply. It helped alot.

Nazli