Question on burner placement in gas forge

[JONWEEZIE]

I've recently build a new gas horizontal forge using a 5 gal propane tank with 2in of kaowool also satanite coating with ITC-100 final layer. But I'm not sure if my burner in positioned in the proper angle. Do I want it in the front with the nozzle pointing at the firebrick floor? Or along the curve? The bunker in the middle or back of the forge. Help would be greatly appreciated. Thanks

 

[NC Biker]

 

[Atlas Knife Company]

My testing(yes, I've built the same forge with both locations) has shown that placing the port in the front angling back gives a more efficient combustion. It effectively doubles the amount of time the gas has to combust while in the chamber and results in a smaller dragon's breath. However, a rear exhaust port is necessary to make a front port work. The rear exhaust needs to be enough to reduce turbulence in the chamber. If the port is in the back, as shown in the awesome diagram, you will have a lot more flame coming out the front.

The 30% rule only applies to forward facing rear burners. In a rear-facing front burner I have it at about 2" from the front, no matter the length of the forge. It's going to blow to the back and then back out the front, giving a more evenly heated chamber.

Furthermore, recently we began testing a lower placement for burner tubes. Given the front placement of the burner, intake of hot gas could be an issue. Since heat rises, this is alleviated by placing the end of the burner below the chamber as shown in the modified diagram. It's kinda funny, Stacy and I both had this same idea on the same day!

NC Biker is spot on with the 20° angle. I use 21°, but my protractor could be off.

View attachment 593357

Look, almost no dragon's breath:

[youtube]_MS6Ah1Ljq8[/youtube]

 

[JONWEEZIE]

Thanks for the help guys I really appreciate it.