Gas injection into forced air burners ?

Mark Williams

Mark Williams

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Does the distance from the mouth of the burner make a lot of differance as to the gas injection. Lets say for example I wanted to put a diffuser inline with the burner to get better gas/oxy mix prior to the burner tube. Would it be a problem?
 
I'm just fancy that way :). I just have a diffuser laying around and thought it would be nice to use it.
 
Hmmm , I thought it made sense to have the air/gas mixed better to get a better burn. i was just wondering if it would cause any pressure or backburn problems. i guess as lond as the fan is working you are okay.


Where's the hawk pics larry?
 
Mark Williams said:
Does the distance from the mouth of the burner make a lot of difference as to the gas injection. Lets say for example I wanted to put a diffuser in-line with the burner to get better gas/oxy mix prior to the burner tube. Would it be a problem?
Click to expand...


Hi Mark, yes it does, the longer the distance the better you are, more fuel/air mixing going on. ...just be sure your blower is big enough to accommodate any long pipe runs. There are other tricks you can use to get good fuel/air mixing in shorter burner tubes, but a longer tube with a couple of turns is the easiest way to do this. When I finish up with the Forge Gallery pages this week, be sure to take a look at Matt Walkers damascus forge for some ideas he used...and it produces a suitable mix even given the very short burner tube he has used. Also, decreasing the size of the actual burner tube itself relative to the rest of the burner tube size will increase the gas velocity...

:)

-Darren
 
Where's the hawk pics larry?[/QUOTE]


I haven't finished it yet. This one (the first solo) probably won't be for sale. It will go up on the wall to remind me that the slot has to be centered or the drift tends to drift from center causing the walls to be thicker on one side than the other. It is also hard to hold it, the drift and hit it at the same time. Practice.. Practice... Practice. Got a little further to go on the handle whole and then draw the spike and the face. Pics not far. Just woke up and I think I'll go hit on it some more now.
Larry
 
Thanks Darren

Did you get my e-mail about the forge interior metal parts coating? I was curious if antone had tried it and their results.
 
Have fun Larry, I'm in the process of letting one cool down right now to see how my welds held up. It's just a laminate that will probably split onto layers when I try to drift it. Oh well, it's all fun.

Mark
 
Mark Williams said:
Thanks Darren

Did you get my e-mail about the forge interior metal parts coating? I was curious if antone had tried it and their results.
Click to expand...

oops! I did, but got sidetracked and completely forgot to reply. The stuff is still sitting in the bag out in my shop, I kind of had a bunch of unexpected distractions pop up this year so far and that got pushed to the back burner. I think once I get back from vacation second week of August, I'll make that my priority to get that stuff mailed out to the people on the list...you're on it.

I heard Steve Dunn was extolling the virtues of this bubble alumina refractory up at the ABANA conference...someone told me....anyway, it's supposed to be really flux resistant, but the stuff is expensive unfortunately.

:)

-Darren
 
Here is the first solo hawk
It's not heat treated yet so I didn't set the handle yet.
http://www.nowickicustomknives.com/forumpicks/firstHawk4resized.jpg
I started from this
http://www.nowickicustomknives.com/forumpicks/FirstHawk1resized.jpg
Heated and cut the slot. Started the drift.
http://www.nowickicustomknives.com/forumpicks/FirstHawk2resized.jpg
http://www.nowickicustomknives.com/forumpicks/firstHawk3resized.jpg
This part turned out OK
http://www.nowickicustomknives.com/forumpicks/firstHawk5resized.jpg
It went a little off as I set the drift but what the heck, its the first one and I'll know better for the next one.
http://www.nowickicustomknives.com/forumpicks/firstHawk6resized.jpg

Any sugestions?
Larry
 
For you first solo attempt Larry, you did well. It's very hard to do by yourself as you've seen. One thing you can do is to drill two 1/8" holes 1 and 1/8" apart and slit between. Or just cheat and mill a 1 and 1/8" slit and drift that. It'll get easier the more you do. Get someone to strike for you. Hey, one w/e why dont you come down or I'll come up and we can spend the day just getting material slit and partial drifted.
 
Hi Mark,
Don't know if you've ever seen a "BAM" burner. We found it online and have been using this fine homemade burner for welding for a while. Inside the mixing tube, there are two multi bladed prop. shaped fins brazed onto the propane pipe. The fins on one are twosted the one way and on the other the opposite way. The result is a relatively short burner tube with good mixing potential. I could give better detals if you want.
 
Hey, one w/e why dont you come down or I'll come up and we can spend the day just getting material slit and partial drifted.[/QUOTE]


Sounds good but it will have to wait till fall. You know I'm a farmer and we are going full tilt with local produce right now. My time is limited till we get through this. I'll plan on it. We can figure which direction, me down or you up(boy I know where that could go) when the time comes. Till then I'll spend a couple hours now and then practicing when I can. Keep hammering.
Larry
 
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