I'm making a new burner, and I'm using black steel pipe and .45 mig tips. I already have a high pressure regulator. I'm contemplating my air intake design on my burner. I was going to cut some slots out of the pipe and put another pipe which I can adjust on the outside for a choke. My question is, how should I position my propane mig nozzle in relation to my air intake? Does that matter? I see in some burner designs the air intake is behind the fuel nozzle, and in others the fuel nozzle is in front of the air intake. Which is better? Should I make it so that I can adjust my fuel nozzle to behind or in front of the air intakes?
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Propane Burner Question
- Thread starter otpowell
- Start date
those 2 scenarios sound like the same setup?
No they are not the same setup. I'll post pics when I get home.. The designs where the air intake is behind the fuel nozzle, they usually use a bell reducer at the back of the burner. The design where the air intake is in front of the fuel nozzle, they usually mill slots in the burner or drill holes to allow air in. Sometimes they put another pipe over the burner so that they can adjust the amount of air that is sucked in. I was wondering if this mattered or if it's all the same since the atmospheric pressure is lower inside the burner.
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Here's a thread about how I came to these conclusions:
http://www.bladeforums.com/forums/showthread.php/1107561-New-burner-development-and-discovery
Heres a pic of various burners. I build and sell the burner in the second pic. It's a simple design, just put the orifice about 1/4" away from the intake tube and it works. I use the term "orifice", as that's the important part of the "jet nozzle" as far as placement. You could buy a .045" drill bit cheaper than you can buy the mig tip.
Here's some info about your MIG tip size and expected BTU output:
Enter the Propane Gas orifice dia. in inches 0.045 inches
Enter the propane pressure in psi 20 psi
Orifice discharge coefficient 0.75 Coefficient Note: *
BTUs per Cu ft. 2498 BTUs / cu. ft.
Air to propane ratio for (1 cu ft of propane) 23.86 cu ft per min.(CFM)
BTUs per Lb of propane 21,591 BTUs / Lb.
Propane weight per gal. 4.24 Lbs / gal.
Burner Heat out put in BTUs 118,858 BTUs per hour
Air needed to support combustion 18.92 cu. ft. per min. (CFM)
Lbs. of propane per hour 5.50 Lbs./hr
Consumption rate in hours:
20 Pounds = 4.7 Gallons 3.63 Hours. (BBQ Size)
30 Pounds = 7.5 Gallons 5.45 Hours.
40 Pounds = 10.2 Gallons 7.27 Hours.
50 Pounds = 12 Gallons 9.08 Hours.
60 Pounds = 15 Gallons 10.90 Hours.
100 Pounds = 23.5 Gallons 18.17 Hours.
200 Pounds Other Cylinders 36.33 Hours.
http://www.bladeforums.com/forums/showthread.php/1107561-New-burner-development-and-discovery
Heres a pic of various burners. I build and sell the burner in the second pic. It's a simple design, just put the orifice about 1/4" away from the intake tube and it works. I use the term "orifice", as that's the important part of the "jet nozzle" as far as placement. You could buy a .045" drill bit cheaper than you can buy the mig tip.
Here's some info about your MIG tip size and expected BTU output:
Enter the Propane Gas orifice dia. in inches 0.045 inches
Enter the propane pressure in psi 20 psi
Orifice discharge coefficient 0.75 Coefficient Note: *
BTUs per Cu ft. 2498 BTUs / cu. ft.
Air to propane ratio for (1 cu ft of propane) 23.86 cu ft per min.(CFM)
BTUs per Lb of propane 21,591 BTUs / Lb.
Propane weight per gal. 4.24 Lbs / gal.
Burner Heat out put in BTUs 118,858 BTUs per hour
Air needed to support combustion 18.92 cu. ft. per min. (CFM)
Lbs. of propane per hour 5.50 Lbs./hr
Consumption rate in hours:
20 Pounds = 4.7 Gallons 3.63 Hours. (BBQ Size)
30 Pounds = 7.5 Gallons 5.45 Hours.
40 Pounds = 10.2 Gallons 7.27 Hours.
50 Pounds = 12 Gallons 9.08 Hours.
60 Pounds = 15 Gallons 10.90 Hours.
100 Pounds = 23.5 Gallons 18.17 Hours.
200 Pounds Other Cylinders 36.33 Hours.
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- Feb 16, 2010
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double post
Yeah your right sorry! Worded wrong. I meant fuel orifice behind the air intake or fuel orifice in front of the air intake.
Thanks for your post Zaph1.. Do you know if it matters if my orifice is behind or in front of the air intake? I am modifying a existing burner design and don't want to make the fuel pipe perpendicular to the burner.. It's easier for me to make it parallel, so that's why the question.. I want to cut slots in the pipe and have Another pipe on the outside to adjust the air intake. Just wondering if I should engineer it so that my orifice is up further in the burner so that my air intake is behind my fuel orifice.
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- Feb 16, 2010
- Messages
- 3,668
In that case, it depends on the size of the air intake and burner tube. I had trouble getting an inline design to work, which is why I came up with the design that I did.