Tuesday, February 11, 2014

Controlling flame impingement…

Why is 'flame impingement' bad for the catalyst?

Direct flame contact is death to the catalyst. A catalyst burns the byproducts in the smoke. The gases such as CO, HC, and O2 ignite with each other in a chemical reaction in the presence of the catalyst (while passing through the honeycomb configuration).

Direct flame inhibits this reaction by changing the chemical make-up of the catalyst breaking down the substrate or ceramic.

Today's modern wood burning stoves are designed so that flame impingement is unlikely. However, it is not impossible. A strong fast draft can pull the flames into the catalyst. A hot fire with all the primary air controls wide open or perhaps the firebox door or ash pan door ajar are other ways the catalyst might receive flame impingement.


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