[TheForge] Burners

[theforge@mailman.qth.net]

In a message dated 3/8/2004 9:22:02 AM Pacific Standard Time, quahog@tds.net 
writes:
This is a good point that many do not quite grasp, namely the purpose of 
the flame holder.  some, even one burner guru out there, have claimed that 
the flame holder was there to get hot and maintain ignition, even to the 
point of saying that the flare is not a flame holder.  I think you've made 
a pretty good description here.
 To Dave Brown 
 What's his name? He may be a little mixed up, but I can't wait to meet him. 
I would tell him that the various flared, straight, and complex shaped nozzles 
on gas burners, along with burner portals, are impedance devices, which work 
to keep the flame from blowing off the burner's end by lowering the pressure 
of the incoming gas air mixture. this lowered pressure also prevents the flame 
from simply burning its way back up the mixing tube. 

Some of them also carry out other valuable functions, depending on design, 
like continuously igniting the outer periphery of the flame's wave front, also a 
well established and quite traditional use for them.
Perhaps, if this "guru" were to actually read the burner nozzle section of 
chapter two in my book, all that would become clear to him or her.

I think my favorites though, are the latest nozzle mix oil burners that use 
the recirculating flame to preheat the combustion mixture, enabling them to 
burn with a blue flame. One kind uses a metallic nozzle and the other a burner 
port of cast refractory. If you like things quiet, there is a lot to be said for 
cast ceramic multiple hole burner heads, rather than nozzles. One can make 
quite a study of the subject, and some of us have.

I'm not a big fan of forced air burners. On the other hand, I don't recall 
saying anything against them either; they simply don't matter to me at all. That 
may change when I get around to them, and it may not.

But, I've strayed from my original question. Who is this poor confused 
"guru"? I want to help if I can.
Michael Porter


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