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Jet burner clearances

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kramerog:
I have two natural gas jet burners in my three tier brewery.  The bottom one which is close to the floor burns very yellow.  The top one burns quite blue.  What is the proper clearance from the floor?  The bottom of the burner ring is only 1.75 inches from the floor.  The top of the tips are 2.25 inches from the bottom a flat bottom kettle.  The burner originally had 23 burner tips, but now only has 12 tips.

The burner can be seen at http://www.facebook.com/photo.php?pid=30811465&l=98f3ffe745&id=1455129973

Thanks Kramer OG

toddster:
the reason for the yellow flame is incomplete combustion. you need more primary and/or secondary air. todd

kramerog:
Opening the door wider seems to have fixed the problem.  But I still think that being so close to the floor chokes the flow of air a little.

euge:
I found raising the ring about 3" off the floor and ensuring good air-flow helped a great deal with my NG burners fuel-air mix. However, I'm keeping the kettle about 18" from the ring otherwise the flames shoot out from beneath LOL!!

Orange flame means fuel-rich atmosphere for those that don't know.

Kramer it looks like you might have some bi-metallic corrosion going on there with those hex screws plugging up the jet-holes.

kramerog:

--- Quote from: euge on February 11, 2010, 11:15:46 AM ---
Kramer it looks like you might have some bi-metallic corrosion going on there with those hex screws plugging up the jet-holes.

--- End quote ---

Euge,

I looked into it.  What you are seeing is dried wort from a boilover.  I'm not sure what the screws are made from exactly - some kind of steel?  Anyway I'll monitor the situation.  Thanks

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