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Thread: My burner does not work

  1. #31
    I thought I might share some pictures of my scraping furnace, the 3 burners in the back are firing at about 75kbtuh the hybrid fires at about 125kbtuh gas at full fire. in the picture the gas is turned down to about 25kbtuh just for flame retention when a cold cylinder head is put in the furnace. The waste oil will burn about 3 gph at full fire, in the picture it is firing about 1.5 gph.

    the burners are simply a 2" air tube with a 3/8 gas line ending about 2" from the end of the air tube the 3/8" pipe has a pipe plug that is drilled with a #21 orifice. It is firing NG at 7" WC pressure, when i fired this furnace with propane I had to drop the orifice size to a #30 firing at 11" WC using a regulator that is normally used on an RV. It would feed about 400kbtuh on propane.

    The combustion fan that i am using, is harbor frieght fan.

    fan.jpgburner medium tilting.jpg

  2. #32
    Senior Member OCD's Avatar
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    FYI, A BBQ regulator is like a 5psi and the turkey fryer's are 10 psi I believe.
    Not even close to what is needed with a furnace burner.

    Saadat, we're not picking on ya, we're trying to help you out here.

  3. #33
    my burners fire at 1/2 to 3/4 lb propane pressure, and less than 1/2lb Natural gas,all i have to do to change fuels is use the correct size orifices found on the sizing charts, it doesn't even take a guess. . I can melt everything except iron with the the simple burners that I use. low pressure burners just need fans for combustion air, they won't draft enough using riel style burners, most large commercial foundries fire with low pressure max 2 lb gas and combustion fans. they can fire in the multi million btuh range. I have used BBQ regulatorss to fire my small furnace at 85kbtuh. It will melt 14lb aluminum in about 15 minutes and 25 lbs brass in about 30 minutes.

    A Riel style burner requires the higher pressure gas to generate enough negative venutri pressure to draw sufficient combustion air.

    I could design a Riel style burner for use with low pressure gasses, forced air is easier and more adjustable

    Art B

  4. #34
    My orifice that I bought from shop was small I change it. New is 1 mm. I get a better and stronger flame now.

    -----------------
    I tested this orifice with all of my burners. These are the best flames that I got

    1-3/4 inch - air force burner :
    http://uupload.ir/files/2hef_img_20170902_215536.jpg

    Video :
    http://iranbm.com/saadat68.mp4
    Is this neutral ? If yes I can go build a new one with 1 inch pipe
    ----------------------------
    Venturi propane burner:
    http://uupload.ir/files/76z7_img_20170902_210351.jpg
    ------------------------
    Burner bought from shop (I change it's orifice too ):
    Can I melt with this burner?
    http://img31.114pifa.com/3315/7eAn5hrCV_1417975693.jpg

    Is this neutral ?
    http://uupload.ir/files/fomr_img_20170901_193025.jpg

  5. #35
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    I'll wait for someone else to say if you are neutral or not but your venturi demonstration will certainly melt metal.
    The shop bought nozzle is just like the one I posted in the video before. I just removed the flare and installed a quick change fitting to the burner pipe. It just dumps propane into the pipe. Not regulator. It melts fine.

    Pete

  6. #36
    Senior Member OCD's Avatar
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    Just go get a weed burner and grab the misses hair dryer.

  7. #37
    [QUOTE=saadat68;206032]My orifice that I bought from shop was small I change it. New is 1 mm. I get a better and stronger flame now.

    -----------------
    Compared to my low pressure burners my NG orifice is 4.1 mm My propane orifice is 3.25 MM these are passing 75kbtuh Bear in mind that a 4mm orifice will pass 16 times more fuel than a 1mm orifice at the same pressure. you would need 25 psi to get the same flow out of your 1mm orifice that i get out of the 3.25 mm orifice at 2 lbs.

    due to the small amount of yellow flame they appear to be slightly reducing flames (not enough air) an oxidizing flame will have a sharper blue pointed flame. these flames would all work in a furnace, depending on the furnace you may need a little more air, as long as the flames don't have much yellow in them they are acceptable in a furnace the shop bought burner is firing at about 85 to 90 kbtuh and will work correctly in a furnace.

    Art B

  8. #38
    Thanks all

    Quote Originally Posted by Petee716 View Post
    I'll wait for someone else to say if you are neutral or not but your venturi demonstration will certainly melt metal.
    The shop bought nozzle is just like the one I posted in the video before. I just removed the flare and installed a quick change fitting to the burner pipe. It just dumps propane into the pipe. Not regulator. It melts fine.

    Pete
    Yes I saw your video
    Do you get a completely blue flame ?
    [QUOTE=master53yoda;206038]
    Quote Originally Posted by saadat68 View Post
    My orifice that I bought from shop was small I change it. New is 1 mm. I get a better and stronger flame now.

    -----------------
    Compared to my low pressure burners my NG orifice is 4.1 mm My propane orifice is 3.25 MM these are passing 75kbtuh Bear in mind that a 4mm orifice will pass 16 times more fuel than a 1mm orifice at the same pressure. you would need 25 psi to get the same flow out of your 1mm orifice that i get out of the 3.25 mm orifice at 2 lbs.

    due to the small amount of yellow flame they appear to be slightly reducing flames (not enough air) an oxidizing flame will have a sharper blue pointed flame. these flames would all work in a furnace, depending on the furnace you may need a little more air, as long as the flames don't have much yellow in them they are acceptable in a furnace the shop bought burner is firing at about 85 to 90 kbtuh and will work correctly in a furnace.

    Art B

    Today I test air force burner with 3/4 inch pipe but with low pressure regulator
    http://uupload.ir/files/hwvs_img_20170903_182338.jpg

    I want to melt silver with 1000 C temp
    Can I use this ?
    Which one is better for me ?

    Is 4 mm orifice safe ? I think flame can backs to the tank
    Last edited by saadat68; 09-03-2017 at 07:24 PM.

  9. #39
    Quote Originally Posted by caster View Post


    Maybe these will help, naturally aspirtated at 20psi.

    Caster
    Can I use 1/4 inch pipe instead of /8 inch pipe ?
    I couldn't find 1/8 inch

  10. #40
    I made a reil burner. It is like conventional design, Just my pipe is a little smaller. It is 8 mm with 5 mm hole.
    I think 1/8 inch pipe is 10.3 mm
    http://uupload.ir/files/5xdf_img_20170913_193431.jpg

    And this is my flame. It doesn't work, Right ?
    What is problem ? 8 mm pipe ? I am really hopeless
    Can I melt silver with this flame ? Maybe in future I will make a good burner

    http://uupload.ir/files/uvbs_112.jpg
    http://uupload.ir/files/5t26_113.jpg
    http://uupload.ir/files/xiqx_114.jpg

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