Homemade Gas Burner - The poorman's Bunsen Burner

Today I published a video where I narrate the construction of what I call "a homemade bunsen burner for outdoor use".

(https://youtu.be/TBGOinVqCBU)

My alcohol lamp served me for a long time. It was possible to do almost anything with it, including melting small portions of lead or concentrating small volumes of sulfuric acid.
However, I felt the need for an apparatus in which it was possible to adjust the heating in a more comfortable way. This project fills this gap.

I know that a decent gas burner is not terribly expensive, but sometimes a not-so-young financially fucked chemist needs to be glad with the few resources he can devote to his hobby. Also, building things and seeing them work is always fun.











I thought that the air regulator, being made of plastic, would be one of the critical parts of this project. However, I found that:

1) The flame does not appear to burn inside the tube or even at the open end of it, there appears to be a millimeter interface between the lower end of the flame and the gas flow at the outlet of the tube. That is, the flame front does not seem to hit the metal at any time, but rather to burn a millimeter or less just above it. It is possible that this is a characteristic of this specific system and the low gas injection pressures involved.

2) The gas leaves the cylinder at a really low temperature and cannot exchange heat with the ambient before reaching the burner. In fact, in some moments, even in full operation, it is possible to feel the bottom of the aluminum tube slightly cold

3) The use of a heatsink as a base was really efficient in removing any residual heat before it reached the regulator.





The gas regulator is a point that deserves continuous attention. It worked incredibly well and tests carried out under water proved that there were no leaks of any kind. However, it is still a homemade regulator being used to extract flammable gas from a pressurized cylinder. Since the device will be used exclusively outdoors, small leaks of gas at the regulator junctions - more dangerous for this poor chemist's wallet than for his safety, I would say - can be induced by the vibrations of daily use. I intend to replace it with a suitable regulator as soon as possible.




Having said all that, I am happy for my new equipment. Heating things up to moderate temperatures will become a little easier now


[Edited on 31-3-2021 by Johnny Cappone]

Quote: Originally posted by itsallgoodjames

Cool! Kind of unrelated, but those are some huge images.

I swear to God I don't know how it happened.
I always take care to resize the images to a suitable size before posting them on forums, for some bizarre reason these have gotten so big that they distorted the text box. Selecting the "print version" option helps a little.

Edit: I found that it is possible to use the command [img = 50x50] http://www.php.net/gifs/example_example.gif [/ img] to resize the posted images regardless of their resolution on the original site. My bad for the gigantic images.

Despite having been lurking for about 10 years, I am still learning how to use the forum tools

[Edited on 31-3-2021 by Johnny Cappone]

Quote: Originally posted by Johnny Cappone

Quote: Originally posted by itsallgoodjames   Cool! Kind of unrelated, but those are some huge images. I swear to God I don't know how it happened. I always take care to resize the images to a suitable size before posting them on forums, for some bizarre reason these have gotten so big that they distorted the text box. Selecting the "print version" option helps a little. Edit: I found that it is possible to use the command [img = 50x50] http://www.php.net/gifs/example_example.gif [/ img] to resize the posted images regardless of their resolution on the original site. My bad for the gigantic images. Despite having been lurking for about 10 years, I am still learning how to use the forum tools [Edited on 31-3-2021 by Johnny Cappone]

Quote: Originally posted by draculic acid69

Nicely done. Could you tell us more about where U got the parts or off what products U got them plz. A parts list would be great. For example what is the white thing the regulator is made of? And is that black Screw thing a metric fine threaded long thin bolt? Does it just thread through the white regulator part? [Edited on 1-4-2021 by draculic acid69]

Sure! Most of the stuff was scrap that I keep in an old chest.
When we are going to discard something (an empty shampoo bottle, a jar of mayonnaise, an old microwave) I look at that and ask myself, "Is there anything I can use to build something interesting?"

When building something improvised, I simply open my old chest and see which pieces can fit together to fulfill the desired purpose. That is why, instead of having a list of parts that could be purchased, there is a visual description of each component and its function.

Both regulators were made with "finishing hole plugs" (I think that is the correct term) obtained from a fruit bowl that would go to waste, but they could perfectly be made with plastic billets and a drill.

The gas regulator screw is, as you noted, just a long, thin screw that has been covered with plumber's tape (PTFE). There is nothing special about it, except that it must have a fine thread and fit firmly on the plastic part that covers the gas valve. When turned clockwise it moves down and presses the valve to release the gas. The fact that it has a fine thread allows it to move in small increments with each turn, which allows fine control of the gas flow.

Format Factory

Quote: Originally posted by MadHatter

https://format-factory.en.softonic.com Johnny, above is a link that might be able to help you trim files. Technically it's conversion software. I've used it to make program icons from jpeg images. It's ad supported so there is no cost. This free tool has been very useful.

I make torches too

Quote: Originally posted by earpain

Thank you for sharing! So that is butane or propane? Do you have a pressurization orifice , in the gas supply somewhere, as any plumber's torch etc. would have? If so, did you make it or gut it from something else? (the store bought ones have a bored hole that is too small to be visible to the naked eye) Also, I could be wrong here, but I think there may be a technical difference between a 'regulator' vs, a 'valve'. I built a big torch connecting to a BBQ size large propane tank. I used a proper regulator(designed for acetylene), a regulator+valve i cannabilized from a plumber's torch, and then I tried just a needle valve. My understanding is that a regulator vs. valve is like thermostat vs. voltage/flame size control. Taking the regulator apart revealed a different mechanism for controlling the gas flow then a needle valve, which I believe is the same as your fine threaded lug device. Where as a regulator would have a diaphragm like rubber piece, and a spring, and would increase flow when screwing in, vs. a valve increases the gas when unscrewing. If the flame is igniting above the opening of the burner, this usually indicates less-than-ideal fuel:O2 mixture. Even when the source of O2 is simply from the ambient atmosphere. Adding an elbow at that spot would allows the oxygen and fuel to mix up a bit more before burning. Otherwise steal wire screen, or something similar helps dramatically. At some point i will rebuild my performance CPU fan powered forced air burner and post pictures. I used 3/4in diameter steel pipes for most of the body, and part of a telescope for the torchhead. How hot does the heat sink get? Thanks again for sharing!

Quote: Originally posted by Johnny Cappone

Quote: Originally posted by earpain   Thank you for sharing! So that is butane or propane? Do you have a pressurization orifice , in the gas supply somewhere, as any plumber's torch etc. would have? If so, did you make it or gut it from something else? (the store bought ones have a bored hole that is too small to be visible to the naked eye) Also, I could be wrong here, but I think there may be a technical difference between a 'regulator' vs, a 'valve'. I built a big torch connecting to a BBQ size large propane tank. I used a proper regulator(designed for acetylene), a regulator+valve i cannabilized from a plumber's torch, and then I tried just a needle valve. My understanding is that a regulator vs. valve is like thermostat vs. voltage/flame size control. Taking the regulator apart revealed a different mechanism for controlling the gas flow then a needle valve, which I believe is the same as your fine threaded lug device. Where as a regulator would have a diaphragm like rubber piece, and a spring, and would increase flow when screwing in, vs. a valve increases the gas when unscrewing. If the flame is igniting above the opening of the burner, this usually indicates less-than-ideal fuel:O2 mixture. Even when the source of O2 is simply from the ambient atmosphere. Adding an elbow at that spot would allows the oxygen and fuel to mix up a bit more before burning. Otherwise steal wire screen, or something similar helps dramatically. At some point i will rebuild my performance CPU fan powered forced air burner and post pictures. I used 3/4in diameter steel pipes for most of the body, and part of a telescope for the torchhead. How hot does the heat sink get? Thanks again for sharing! Thanks for the comments! 1) according to the label, the gas contained in the cylinder is a mixture of butane and propane. No information is provided about the exact proportions. 2) I used a hypodermic needle at one end of the gas line to create a choke, you can see it between the materials at the beginning of the video and in more detail along it. 3) The heat sink is incredibly underheated compared to all the heat that is produced by the flame just above it. I did a long test (> 45 minutes) and at the end it was just warm to the touch. Let us know as soon as your burner is ready! I saw many amazing gas burner designs on YouTube, my portable bunsen burner is just an inexpensive design that met my needs. As I found some creative solutions throughout the project, I decided to share its construction. I want to work on more powerful burners in the future, this opens up the possibility of carrying out several interesting reactions that require high temperature (in addition to opening the doors to metallurgy, a hobby shared by many here, I believe).

1) I ask because you mentioned concern about leaks. The only one of these simple alkane gasses that I have ever encountered to NOT have a smell indicator added, is butane. And that is only for the smaller containers intended only for small lighters. Leaks are definitely a problem that should be fixed, but in my experience it's not a life/death problem. The only danger from a poisonous gas occurs when using oxy/acetylene or oxy/propane, as in glassblowers torches or metal cutting torches, and poor ventilation, has set off my CO detector before.

Maybe once or twice on a very small device a leak ignited. But since there is absolutely no oxygen yet at the spot where the leak ignites, it just creates a quick fuel rich flame, like from a cigarette lighter, and then the compressed gas blows it out. Not good. Someone with long hair for example, maybe would be in danger. But it doesn't explode.

So smell indicator has sufficed for me for this purpose. Other options are as you mention water, soapy water is often used, but more often for things like car tires etc.

And then of course the lovely UV leak indicator. I have yet to try this but I'm sure it's as wonderful as people say.

2) oops! sorry I'll watch the video. Hypodermic needle is a great solution

3) I'm not surprised. I would welcome an experts critique on this, but I don't think burners and torches with compressed gas send heat backwards towards the gas tank. Yes the metal torchhead of course gets hot. But any part of the the torch leading up to there, has a gas blowing through it. Also likely has atmospheric air being sucked in via the vacuum created by the venturi effect thanks to the orifice. And to really seal the deal, the gas is being decompressed, which is profoundly endothermic as you pointed out when you mentioned parts feeling cold. If this were coal or wood or something like that burning, none of this would apply.



Yes reactions, metallurgy, and I think some members may share my particular interest...glass blowing!

Quote: Originally posted by Johnny Cappone

@Earpain The gas I'm using has practically no smell, just a very light aroma that clearly resembles cooking gas. I know they add ethanethiol to LPG to alert you to leaks. My only concern with the possibility of leaks stems from the fact that I built my own valve/regulator, although, before use, I always check the connections with foam and haven't found any leaks until now. Yes, these cylinders are so small that there is simply no useful area for the gas to exchange heat with the walls of the container at an appreciable level. This exchange ends up happening in the hose that conducts the gas and, eventually, in the body of the burner. And as the fuel/oxidizer is mixed by the Venturi effect, certainly the air swallowed by the instrument also has an effect on cooling. Dude, learning to blow glass is something I would love to do! In fact, I think that in the Scimad library there is some interesting literature on this available. @Morgan: Interesting reading, thanks for the link!