Georgexxx

Just wondering what sort of outputs people have achieved with their oil burners output wise? I know max heat/ flame isn't a big deal in a furnace but wondering what the BIGGEST burners are capeable of? Might be fun to have something that would heat a shed up in a few min or use as a yard heater for parties in winter.

Well, That sure was fun! Made some time this afternoon to give the burner a fire up. Didn't worry about melting anything, just to try and see if the burner would Burn. No worries there! Started it off on gas and with a few powerful bangs that rattled the shed walls, she lit and sustained beautifully. Paint burned off the gas bottle and I could just see it starting to glow red in the daylight. Gas flow was pretty high. hate to run one on gas as I think it would go through a bottle pretty quick. I Started the pump, opened the valve, waited then whoosh, off she went. Flame went from blue which was hard to see to a bright yellow with a distinct increase in roar and noticeable radiated heat. Ran it like that for a bit increasing the oil flow till it looked like one of the burners I have watched on YT so many times. Backed off the gas and the thing just sat there breathing this 3-4ft jet of flame. xxxxxxxx awesome. I sat there watching it for a while and it as like watching a stove. just sat there burning happily away. I do have a couple of pinhole leaks in my weld I noticed which is annoying because it makes little puffs of smoke now and then. Easy fixed though. Was very stable and I could control the flame then after a bit it didn't seem to matter what I did with teh oil valve. I noticed the thing start to spit like sparks and realised they were oil droplets. The bottom of the burner looked pretty cold but the top was really red by now and I could feel the heat radiating off the thing with amazing force. I Looked at the drum I was pumping from and it was down a lot. I was calculating i must have used 7-8 litres and although I didn't know the time I had been running exactly, I figured maybe 15 Min, I'd burnt a lot of oil. I read you can over fuel the things and the way to test was to turn off the oil and if the thing didn't back off in 30 sec it was flooded. It sure was. With no oil flow the thing was stable although doing a lesser flame than before. I backed the air down and that didn't make a lot of difference although after a minute or 2, the thing seemed to pick up all on it's own. I opened the air again and it started to take off really building and starting to run away. I thought something is going to happen here and it Did. I got these huge backfires like shotgun blasts only like a machine gun. Almost exactly like compressor stall on a flooded jet engine where they back fire. Cool! It's a bit like a deflagration. The excess oil in the burner all tries to vaporise and boils at once and there isn't enough air so so it sort of flash backs. Bet it frightened the Bejesus out the neighbors though but was awesome. Puffs of smoke and all. After it cleared itself it settle and the flame began to subside. I played with the oil again there and had pretty impressive throttle control just with the oil and not touching the air. I ran the thing a fair while and threw some old bits of ally in front of the output and it melted them real quick. I can see why they say these things will melt anything. I fired it into a stack of bricks I turned to it could blow through the holes like a big cat converter and in about 5 min they were all glowing real well. I spose I had it going about 45 min and burned maybe 21L of oil. What I notced when I packed it up was the thing was perfectly clean inside. I expected heaps of soot and black crap but it was just the surface rusted steel with what I think was a little ash, light grey powder but not much. I was really happy for a first fire up as lots of people say they have trouble with getting them going but the guy I have been messaging on YT said don't be shy, if it flares up don't back off, give it the beans and it will be fine. and he was right. they need to be started and run pretty hard till they heat up and can turn the fuel from liquid to gas to burn. This burner has only 2" inlet and outlet which I think restricts max power. I'd like to do another one with at least 2.5" in and 3 out because the hot gasses going out should be more than the air going in. I'll also go from the 8mm oil feed to 12 MM which is the diameter of the pump outlet. The guy on YT reckons a castle blower can do 1000Kw worth of airflow so would be interesting to try. So next I'll do a couple more fire ups and play with the fire size and then make my furnace out of a stack of bricks and mud and put the burner in that and see how it goes. Glad I got plenty of oil although it don't see like so much any more! I'll be able to get rid of this stuff quick! :0)

Yes, 3-600Kw an hour should be a lot of overkill for a furnace but it would be fun for other things. Should be great to stand around at a backyard party in winter! I got a bounce castle blower off Fleabay that puts out a good gale and I'm going to either restrict the intake or use a PWM controller to slow it down. Made a burner from a design on the net but haven't fired it up yet. I added a 2nd inlet so I can use one for gas for starting and the other for oil . I think I'll try using a little pulse pump for oil feed and have a valve for controlling absolute flow and another for bypass so the oil loops. The pump I have is rated to 4L / min which would be way too much but if I can work up to that one day, should be something. I thought of another use for the thing today with a bit of modification, a stump burner. Just need to angle the flame down and I thought using some bypass air from the blower into where the fire is so as to make the stump itself burn not use all the oxygen burning the oil. Might try for a test light up this afternoon.

No, I read that and all the other replys thank you. I will be safe. I have not worked out how much metal I'll need yet but I'll make sure if I miscalculate there is amply sufficient melted to make up any shortfall. As for the CO, I would not allow the combustion products from any fire ( or engine) to escape into an enclosed area. That is just basic common sense. Beaver, thank you very much for your comments and Diagram. I was in a couple of minds how to set this up but your suggestion looks excellent and the one I'll follow. I was thinking of a different approach with round bar but I have a good amount of flat stainless I picked up a while back as offcuts from a factory dumpster and they will work with this very well. I have mucked around with casting before and I always make sure to pre heat the molds very well. With the output of an oil burner that should be very quick and easy. Once again, appreciate the very helpful input! So does anyone have any suggestions for something to use as a blower instead of a Jumpy castle type that is not too expensive but puts out good pressure as well as flow? I don't know how to work out air consumption but Ideally I'd like something powerful enough to support combustion of at least 500Ml/ min of oil and up to 1L min. Won't be running at that rate all the time but would like it when I want. the rest of the time I can either use a controller to slow the blower down or just restrict the intake. I'm going to use a burner design that runs on excess air so fuel control is more critical than air control

Thank you Thomas. The burner is something I have wanted to do for a while and this is a use to justify the construction thereof and motivation to get it done. If the anode is not right, no big deal, I got the zinc, a heap of it for nothing and figured this could be a learning experience many ways around. I like the look of the simple brick furnaces I have seen on the net and the guy on YT I have been following makes it looks easy and inexpensive to do. If I decide I want to take it further I'll go to more trouble. From what I have seen and asked, an oil burner is capeable of producing enough heat to melt anything, even refractory and certainly seems to be the most powerful. I don't know what sort of heat proper furnaces produce but the ones I have watched do 2-300Kw easily. They sure look spectacular when they are getting a litre of oil a minute pumped into them. I'd like to melt some scrap aluminum which I have seen done just in a drum for separating the aluminum from steel parts which is the self same job I have. I'll get the burner going and take it from there. No doubt I'll have a lot more questions I hope people can help me with as I go.

Thanks for the replies. Looks like it will be easier than I thought and I had things backwards. Still want to build a flame throwing Oil burner. The things look so awesome and I'd like to give stump burning and shed heating a go with it as well. You are correct Hans, Have to put a piece of steel in the middle. Figured I'd pour half the casting then let it cool, put the bar in after heating it up to drive off any moisture then put it on top of the bit I poured and do the rest. Does anyone know how big a blower I will need? I want to be able to do something powerful but having a bit of trouble finding a jumpy castle blower round here. What are the best ways to preheat the Burner? I have seen gas used and even sticks but is there some other trick to this I'm not aware of. From comments I have read on vids getting the things hot seems the hardest part. Thanks again.

I'm looking to melt some Zinc to make some sacrificial anodes for my boat. The zinc I have got is in bars and seems like it will need a fair bit of heat to melt it down given the weight and thermal mass of the metal. The shapes are very simple and I intend to just press a sample into a tray of sand and clay and pour directly in. I can clean them up later and will mill a flat side and drill the screw holes afterwards. I have been looking at many YT vids and doing some reading here and it seems like a simple oil burner will be the easiest and most appropriate thing for me to use as I get over 40L of oil from my boat every oil change and have over 200L stored up already. From what I have seen on the net I can make a forge just from some ordinary house bricks and compensate any lack of insulation by just powering up the burner. I have spoken ( emailed) a guy on yt who was very helpful and he suggested a pump on a PWM controller for metering the oil output. I have got that and a pump and indeed the amount pumped through is infinitely variable. Just need to get a blower now and finish welding up the gas bottle I'm converting to a burner and I'll be ready to go. What I'm wondering about is what are the best and cheapest things I could line the forge with to stop melting the bricks? This will pretty much be a one off build/ use so it does not have to be long lasting. The YT guy suggested a mix of builders clay, sand and some other thing I can't seem to get. If this glazes I'm not worried but is there any other cheap sort of refractory I can pretty much seal the bricks with? The YT guy did his loose at first but then sealed them with dirt and sand and said it worked much better to contain the heat. I will do the same but wantto0 make a much larger forge to get a bigger crucible I have made into. I was advised not to use cement as that can explode and does not stand the heat well anyway and will crack up but can it be mixed with anything? Also, what is the melting point of Zinc? I believe it's somewhere between aluminum and copper. I have seen oil burners melt copper ( and steel) so shouldn't be a problem but just wondering how hard I'm going to have to run this thing to get it up to temp? I intend to make it tall and put the cruicible a bit raised up so the flame goes under the bottom and heats the whole cylinder. I have had an interest in this for a while and those burners look awesome in the heat and flame they can put out so if this goes OK, I think I'll look at maybe doing some other castings. I can get loads of scrap aluminum for nothing * just have to melt it off the steel screwed into it) and there are lots of simple things on the boat I could copy as well as maybe doing something arty! :0)