Need more air to my burner - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > DIY Projects > Brew Stands > Need more air to my burner

Reply
 
Thread Tools
Old 12-07-2012, 02:00 AM   #1
mrrshotshot
Senior Member
HBT_LIFETIMESUPPORTER.png
 
mrrshotshot's Avatar
Recipes 
 
Feb 2012
Petaluma, CA
Posts: 649
Liked 45 Times on 41 Posts



So I just finished building my all grain stand a couple days ago. We decided to fire it up for the first time today and simulate a brew with water just to make sure everything works out fine.

When we fired up our boil burner (10" Banjo Burner) we adjusted the vents to get a nice blue flame. However, upon placing the kettle on top of the burner our flame was choked and instantly turned a bright bright yellow.

Here is how the Boil burner is setup:



We tried simulating this with one of our other burners for the Mash Tun to see if we got the same effect. Even with the kettle on the flame maintained a nice blue with very little yellow.

Here is how the Mash Burner is setup:



As you can see, there is significantly more space in between the stand and the heat shield on the burner for the Mash than there is on the burner for the Boil. This was done because we are using two different pots that dont have the same diameter on the base.

My best guess is that the burner for the Mash gets more air flow to the flame than the burner for the boil due to this extra space. When we place the kettle on the boil our guess is the flame is getting choked too much.

I'm looking for ways to try and improve air flow to the boil burner. So far the idea that seems to sound best is to drill holes or cut gaps into the heat shields here:



I feel like this will allow more air to get to the flame and prevent all the wasted energy. But before I start cutting I wanted to get the opinions of all you esteemed members of the HBT forum.

Thought, ideas?

 
Reply With Quote
Old 12-07-2012, 02:21 AM   #2
BadNewsBrewery
 
BadNewsBrewery's Avatar
Recipes 
 
Oct 2012
Severn, MD
Posts: 1,244
Liked 129 Times on 103 Posts


I'm thinking there's a different issue here. The blue flame is indicative of a pr-mixed flame with a good fuel / air mixture prior to combustion - the entire mixture burns at once. The yellow flame is indicative of a boundary layer flame, where you have mostly fuel coming from the jet and the fuel mixes with the oxygen in the air where the two meet after the nozzle. Where the ratio is at the right percent of fuel to oxygen (upper flammability limit), you get burning.

My point - the flame color has less to do with the entrained air that is part of the convection process and more to do with the mix prior to the nozzle. Have you tried messing with the air valve in the propane line while the kettle is on?
__________________
Building a Bad News Brewery - eHERMS

2014 - 70gal
2015 - 72gal

 
Reply With Quote
Old 12-07-2012, 02:26 AM   #3
mrrshotshot
Senior Member
HBT_LIFETIMESUPPORTER.png
 
mrrshotshot's Avatar
Recipes 
 
Feb 2012
Petaluma, CA
Posts: 649
Liked 45 Times on 41 Posts


Quote:
Originally Posted by BadNewsBrewery View Post
My point - the flame color has less to do with the entrained air that is part of the convection process and more to do with the mix prior to the nozzle. Have you tried messing with the air valve in the propane line while the kettle is on?
If by air valve you mean the vent on the burner then yes. Right now it is wide open. If we close it at all the flame just gets yellower and yellower.

Every burner has the vent wide open and produces a nice blue flame. The only one that produces a yellow flame is the boil and it only does it when the kettle is placed on the burner.

The reason I brought up the holes idea is because I noticed on my turkey fryer that the heat shield around that burner has about 3 holes the size of a thumb on it....?

 
Reply With Quote
Old 12-07-2012, 02:46 AM   #4
BadNewsBrewery
 
BadNewsBrewery's Avatar
Recipes 
 
Oct 2012
Severn, MD
Posts: 1,244
Liked 129 Times on 103 Posts


Do you have an air compressor? Try blowing air into the vent, see if that blues up the flame. Could be a fun experiment anyways...
__________________
Building a Bad News Brewery - eHERMS

2014 - 70gal
2015 - 72gal

 
Reply With Quote
Old 12-07-2012, 03:56 AM   #5
mikescooling
 
mikescooling's Avatar
Recipes 
 
Jan 2012
Chicago, IL
Posts: 2,006
Liked 269 Times on 203 Posts


why don't you tr putting some wedges underneath the brew kettle to give the flame someplace . Sorry this is from my phone

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
BAYOU BURNER Kick A Banjo Burner Plus KAB6 BMWMK2 For Sale 1 09-06-2012 05:00 AM
WTB: Good LP Burner - currently using a turkey fryer burner and need to upgrade flyfisherwes For Sale 0 02-20-2012 07:45 PM
Conversion from Turkey Fryer burner to Banjo Burner brewfeller Equipment/Sanitation 1 07-31-2011 11:25 AM
Does a Natural gas burner pose the same problems a Propane burner poses? Endovelico Equipment/Sanitation 15 01-28-2011 05:48 PM
Help Me Understand the Process (2 burner setup BK & HLT, MLT insulated no burner) mplutodh1 Equipment/Sanitation 14 11-09-2009 01:00 PM


Forum Jump