Custom made gas burner

admin

Hi, i am trying to make a burner to a gas oven. Now i have a oven that i am trying to copy. Why am i doing this, well the oven i have uses 1/4" pipes and i want to use 5/16 and make it up to standard here in Kenya, the original oven is from Brazil.I am using a 13 Kg gas tube with normal cooking gas, hight pressure valve and the old oven was working just fine (not any more because i took it apart and can not now put it togehter again).I have 1 shutoff valve, 1 monometer (0 to 1 Bar) then 1 regulator valve(needle valve) then a normal burner. Now i need to add a new top to this burner that has to be 450 mm in diameter.See picture, nowso far so good, gas goes up in to the burner top but i get no jet flames thru the small holes, the flames blowes out directly more or less. I can get a very small blue flame but when i touch the regulator on the tube it blowes it out. I have tried to regulate the air intake whit no luck so it is down to the small holes in the burner top.Mine has 91 holes with a diameter of 3.5 mm and original has 95 holes with a diameter of 3.5 mm not i made mine bigger to 4,3 mm but same results.Why isnt this working, should i make the holes even bigger or should i abandon the system and go with a round pipe with small holes. Now it is a cylinder that filles up with gas (Hight 20 mm Diameter 450 mm).I would like to get this to work before i get it approved for use, dont want it to fail when i use it.So does anyone have any good ideas what i could do? Attached Images
Reply:Your problem is where the brass tube connects to the tube entering the disc.Make something like this so you can fine adjust the amount of air entering and then lock it down with a screw when you get it right. The problem is air entering in relationship to gas being burned.
Reply:Yes. Personally I'd go with what everyone else in the world uses. round tubes with holes in various configurations. Either way you have to be able to fine tune the air feeding the gas.
Reply:Hi, i have been adjusting the air intake on the burner at the bottom but i cant get that to work. If i close it compleatly then i get a high yellow flame that just refuses to die out. If i open it just a little it gives a blue flame but stil blowes out. What would be the differens to add this part or similar part, (i live in kenya and finding the correct parts here is difficult  )
Reply:Heres some pictures to look at for other ideas too Google images  " turkey cooker burner" https://www.google.co.cr/search?q=tu...w=1360&bih=629
Reply:more ideas  https://custompipeburners.com/Manifolds/56
Reply:Paella style ?
Reply:Originally Posted by KenyaHi, i have been adjusting the air intake on the burner at the bottom but i cant get that to work. If i close it compleatly then i get a high yellow flame that just refuses to die out. If i open it just a little it gives a blue flame but stil blowes out. What would be the differens to add this part or similar part, (i live in kenya and finding the correct parts here is difficult  )
Reply:I'd be interested to hear more about  who "approves" something as simple as a stove or oven burner ? Kenya sounds about as "free" as the USA Inc. NLC-No Liability Corporation).
Reply:The one on the pic you sent looks nice, just cant have the mitten part,   so you say basicaly my issue now is the air intake. I just want to see if i can get this one to work before i rebuild it    It is still a fun project and as i said i want to improve on the one i am building, and yes brazil do let things pass thru  Kenya has the same rules as the UK so i have to make it much better but as i said i just want the one i have build to work so i can prove that to my self for now then i think i have to go for a round pipe around the cast iron plate.   When i comes to a pipe how big should it be andhow big should th holes be and space between them and so on?I have a lot of questions because this is something new for me, midlife crisis maybe
Reply:I just noticed something else.Where the larger pipe enters your burner after the "mixer" it that pipe tight or threaded ? It should be a very loose fit. Otherwise the burner gets pressured with the heavier gas blocking air from entering. It is a slip fit
Reply:This will help explain what I'm not doing a very good job of ;-)
Reply:The pipe from the air intake (mixer) that goes up to the top is using 1" threads 2 mm pitch so it is a big pipe and there was a small reducer inside but that one did not do anything and it was cone shaped so it just reduced at the bottom of the pipe. I have tried it with and without it and no difference. So should i make the gas intake from the pipe to the top of the burner smaler?   The original is smaller because it has a smaller burner, not by much but some.
Reply:Originally Posted by BonzooPaella style ?
Reply:Holes sound to big. Try sticking the air. Nozzle where the fuel and air mix and see what happens when u blast air in there.
Reply:so how do i know if i have to much air or to little air. The Air intake i fully open on the new burner but not fully open on the old burner and the old burner also has a much smaller air intake. The old burner works just fine. I can see that the old burner has more or less an open botten so that the gas comes from the pipe (6 mm) in and thru the burner while the new burner gas comes in to a small chamber then quezzes in to the burner thru very small gaps. It feels like that kinda kills the speed i need on the gas to fill up the top part. Now i could drill a hole to the small chamber (say 6 mm) and see if that would solve my issue. Any thoughts on that?
Reply:I spent a few min in sketchup...If i use a 20mm outer diameter steel pipe that i bend to a circle and and 1 pipe to feed it with gas like the picture.Then add my cast iron plate ontop like pic 2How big should then the inner diameter of the tube be?and how big should the holes for the gas be around the pipe (no holes on the middle pipe) and how much space should i leave between the holes?This is just something i think i have to do later on, i still want my original one to work but it seems like i have to abandon that one later, but i really want it to work.This is really learning by doing, love it The outer diameter of the circle would be 450mm Attached Images
Reply:Looked more in to tubes (aluminium)Tube size 1" OD and wallthickness 3/16" (ID 5/8")Circle length 1350 mmGas feeding tube 250 mm
Reply:Quote "I am using a 13 Kg gas tube with normal cooking gas,"...What is normal cooking gas in Kenya? That could be either natural gas or propane in my back yard BBQ.
Reply:Sorry it is propane  we do not use natural gas here
Reply:Originally Posted by KenyaSorry it is propane  we do not use natural gas here
Reply:Would it be ok with just the one gas feeding tube to supply gas all around the circle? and can the air intake still be down when the bas of the burner is?
Reply:heres my burner. The holes are .125. If u shoot the air gun in the intake and get nice blue flames u will know you were rich on propane or a lousy spray that not fine enough
Reply:playing with a big regulator here lol
Reply:If i where to build a burner looking like this (see the rough pic) flames only on the circle not the middle tube, air intake in the bottom tube and also the gas line connection at the end of the bottom tube.3/4 Steel tube, size of the holes for the flames 1,5 mm or 27 mm?and also how big should the hole feeding the gas to the burner be? Attached ImagesSolved my problem with the old set up, the jet holes at the bottom of the burner was to small. Drilled them to 1 mm per hole x 4 holes then it is working perfectly.Still going to move over to a steel pipe solution so i might still have questions  but for now i solved the problem. Attached Images