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Old 03-28-2011, 04:40 AM   #1
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Default NG Burner Question

I am testing out my new brewery. I have been having issues with the burners not burning cleanly. After having to wait for pressure to build or my BK, it finely lit and was burning cleanly for about an hour with nice blue flames and the heat shield was glowing red. I turned it down to do some work underneath the stand, and when I turned it back up it was burning yellow. I could not get it to go back to the nice blue flames again. My HLT was burning yellow as well earlier. I am thinking about plugging some of the burner tips (http://www.homebrewtalk.com/f11/tami...ner-mod-52154/) but I am perplexed as to why it was working great until I turned it down.

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Old 03-29-2011, 02:37 AM   #2
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Crickets

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Old 03-29-2011, 03:04 AM   #3
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The multi jet burners are at best wide open/off control, when the gas flow is reduced the burner tips can not pull enough air to burn clean and you end up with yellow flames,lots of soot, and carbon monoxide from incomplete combustion. A second problem you probably have is the hot gasses trapped under the keg or pot get pulled down into the burner at lower flow levels. If you are looking for clean burning at all settings then the multi jet is not the one for that, the 10" SQ-14 is the best suited for adjustability. A fix to improve the trapped hot gas problem is to cut vents in the keg skirt, this will help but not cure the yellow flame problem.

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Old 03-29-2011, 04:12 AM   #4
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How do you think I got it to burn clean for 40 minutes before I futzed with it? What was odd was that a minute earlier I couldn't even light it. I am guessing my forced air furnace and radiant heat boiler were both running at the same time.

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Old 03-29-2011, 04:13 AM   #5
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BTW: Do you think plugging some of the holes would help so I can run it closer to full open? Right now full open would burn down the house.

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Old 03-29-2011, 04:27 AM   #6
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Plugging the jets to reduce the number to around 10 - 12 would be a big help, but the fewer the jets you have the greater the importance of which way they face. When the tip count is reduced they need to point at each other to be able to transfer the flame for ignition, there are a couple examples in older threads of how this was done. The better long term idea would be to sell those burners to some one building a 1bbl system with 55 gallon drums for kettles, and change to the 10" cast burners.
When the burners were originally fired they created enough draft to keep the fire clean, when you throttled them down that was lost and combustion gas feed back did not help when you throttled up again.

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Old 03-29-2011, 04:56 AM   #7
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Quote:
Originally Posted by joety View Post
How do you think I got it to burn clean for 40 minutes before I futzed with it? What was odd was that a minute earlier I couldn't even light it. I am guessing my forced air furnace and radiant heat boiler were both running at the same time.
I think you nailed it here depending on how your gas lines are piped. If I was to run my brew stand while the heater, water heater, fireplace & gas range were running I'd be in trouble. If you were tee'd off the main line from the meter you would be better off. btw - I just upgraded my flex line to 1/2" from 3/8" and it makes a world of difference to the final output.
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Old 03-29-2011, 04:30 PM   #8
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Same problem here. I ended up plugging a bunch of holes with some good results but still have the yellow flame issue. I also read somewhere that a low pressure regulator can help. I am looking into that now.

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Old 03-30-2011, 06:02 PM   #9
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Quote:
Originally Posted by HoppyGus View Post
Same problem here. I ended up plugging a bunch of holes with some good results but still have the yellow flame issue. I also read somewhere that a low pressure regulator can help. I am looking into that now.
Interesting, please let me know what you find.

Anyway I can create that updraft again?
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Carboys - Bavarian Dunkel

Secondaries - None
Lagering in Kegs - None

Kegged: Belgian Dirty Blonde Trappist Ale, Bourbon County Stout, BLC
Bottled: Oaked Bourbon Porter
Planned: Chocolate Cherry Stout
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Old 03-31-2011, 06:07 PM   #10
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I've given up trying to make the multi-jet burner work. I just ordered the Hurricane burner with the Natural gas conversion valve so hopefully I can hook this up and be done with it.
I will use the jet burner in the fire pit outside in some way.

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