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I Forge Iron

Devil Forge burners not burning properly


jt0119

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Yeah, that fan in the back does oscillate, and I've tried having it point directly at the forge to see if that would clear anything away. I'll try laying modifying it to lay flat and see what that does. 

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I was thinking of some pretty complicated things like ducting air from below the forge but that one's already more complicated than functional. It works as designed but I designed it before knowing what I needed. 

Frosty The Lucky.

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Nope, test failed. It seems like it's a temperature thing to me. I got the forge screaming hot and it seemed to do fine at higher pressures, but I turned it off and let it cool down/air out for about 10 minutes to just slightly glowing, turned the burner on to about 5psi, and same thing.

The one thing the original video I posted doesn't show is how quickly it changes over from burning clean to not. It just snaps over after running for a few minutes. 

Edit: I also picked my dad's brain on some of this. He seems to think my regulator is failing or that somehow, my batch of propane is contaminated. Neither of them make much sense to me, but I figured I'd throw them out there as possibilities. 

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If it were the regulator then you'd see pressure swings, probably even if it was something blocking the gas flow. 

So, if it runs correctly at a higher pressure lower it a LITTLE bit at a time until you find where it starts to act up and use the next higher pressure. 

Uh. . . Glorious? :o

Frosty The Lucky.

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I can hear slight fluctuations, but the gauge doesn't move at all. I can't remember if I heard them when they were working well. What gets me is that the pressure it starts burning weird at was my basic forging pressure before. 

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Here's a thought, how close to the original forge internal dimensions did you stick to one of my earlier designs I made my forge a we bit to small for the size burners and they ran poorly at lower pressure after the forge was hot. I couldn't figure out why for the longest time and just assumed that my burners were poorly built. After some time of just running it how it was the furnace cement has sloughed off the back wall after an attempt at forge welding. I ordered some kast-0-lite 30 from Wayne co and replaced the kaowool linning with half inch instead of an inch. This made it run much better at lower temp but I still wasn't happy. After reading a bunch in the burner threads I changed my nozzle from .35 to .30 and it was way better. The first build was huffing at 9ish psi when it was hot the second change would run 6 and the last is about 4. Not perfect but good enough for this red neck.

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So I ended up building a T burner, and it's already working better. I'm still in the process of tuning it and figuring out a mounting solution, but I'm fairly pleased so far. I'll update once I get it mostly dialed in. 

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Alright, got a video of the best flame I can get out of it, and pictures of the burner if there's anything I need to change about that. I've tried .030 and .035 mig tips, and shortened one of each. Cutting 1/8" off either doesn't seem to do much, and 1/4" makes it worse. I've also played with the nozzles I made, the Zoeller nozzles I got, and a black iron coupler. The video is with the nozzles I made. 

 

Video of the burner running:

https://drive.google.com/file/d/1nmrQa-WcGLOYZi0JAaiX5mTIFi23fO4H/view?usp=drivesdk

IMG_20200719_163814.jpg

IMG_20200719_163814.jpg

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A pic straight through the T so I can see where the jet is will help. It's sputtering just like the other burners. Did you plug the unused burner port so it isn't blasting exhaust gasses straight up at the burner intakes?

I'm sure you told me but but I forget, how many cubic inches is your forge? 

Frosty The Lucky.

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Huh, I meant to include the straight through shot. Looks like I accidentally uploaded the wrong one. Either way, I was playing around with it and got it to burn MUCH better. It still sputters occasionally, but it's doing the opposite of what it was before. Burns perfectly well 99% of the time, sputters for a split second, then goes back to burning just fine.

 

Overall the interior is 384 cubic inches. 

IMG_20200719_181256.jpg

IMG_20200719_174254.jpg

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The flame looks good from here. That is a mighty small volume for two 3/4" burners they're really going to interfere with each other. The others may have worked but I bet they used pretty small jets, say,  0.023 so they run choked almost closed.  They'd make fast flames and overcome the fast but not strong back pressure generated by the second burner. 

I don't think you want to trim 30 cu" off the volume and mount the burner in the center do you? Be easier than making it 200 cu" larger.:ph34r: 

As is I'm wondering about making it work with one 3/4" and one 1/2" or changing it to three 1/2" burners. I just don't see two 3/4" T burners playing nice with each other in that small a chamber. Maybe just over clock one center mounted burner, 35 cu" worth?

Occasional sputter is just exhaust swirling around and the burner getting a puff. Not a thing. Leaning the burner away fro the opening rather than towards it might solve that little issue. Of course it might just be camera angle.

Frosty The Lucky.

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I think for now, I'm just gonna run it off one and throw a fire brick in there to reduce the amount of space it has to heat. I designed and built this before I really had any idea what I wanted to do, and I can't see myself needing a dual burner anytime soon. It's not an ideal solution, but it worked for me before, and if it becomes an issue, it's easy to undo. If that's a terrible idea though, let me know. God knows I'm not immune to those :lol:

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  • 2 weeks later...

Alright gentlemen, not sure if it's a new problem or a continuation of the old one somehow, but I think the flame is burning back up the pipe a little bit. I'm getting similar results without the fluttering sounds. 

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What makes you think it's burning in the tube? Have you pulled it immediately after shutting it off to look at if and where it's heating up? 

A typical reason for pre-ignition is the nozzle reaching approx 2,000f, prop air flash temp.  Is the flare turning orange?

Frosty The Lucky.

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