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Banned on 02/27/2008 Registered Member #1326
Joined: Sun Feb 17 2008, 11:19PM
Location:
Posts: 49
Easy Target wrote ...
In chemsity class last year me and a friend got the idea that with enough HCl and Mg ribbon in a closed container (we were thinking something like a jolt can) with a pin size hole, we could create enough pressure to ignite the hydrogen gas as it exited the container. i.e. 2H+ + Mg --> H2 + Mg+2 Unfortuantly, we never got around to buying the HCl, though we did get a lot of the Mg ribbon. My question is if we do try this, would it be possilbe to create the constant pressure needed to keep the exiting hydrogen constantly ignited? If this is possible, about how long would this last?
if you can get the can to develop 1000psi and make a 50 micron hole with an internal hilsch vortex, it might ignite, but you must also decelerate it.
btw the method they use in ram jets to maintain combustion is to inject metal alkyls into the air / fuel mix to cause it to spontaneouly ignite.
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
He didn't actually mean that he wanted the gas to be ignited by pressure alone, he wanted a high enough exit velocity for it to sustain a flame after being ignited by an outside source (like a lighter or torch would).
Registered Member #1148
Joined: Wed Nov 28 2007, 06:24PM
Location: Clifton, Virginia
Posts: 4
thanks for all the safety tips so far. I understand that some of this could be dangerous.
Just to clarify, i am not trying to light the hydrogen via pressure. Like Shaun said, i would hope to light the initial hydrogen being released from the can with a outside source (i.e. lighter/torch). I was orginally concerned with the possiblity of there not being enought pressure to maintain a self sustaining flame from the hydrogen, sort of like a home made bunsen burner, but with hydrogen
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
With just magnesium ribbon and HCl, the reaction would only last a few tens of seconds and would probably produce too much H2 too quickly. A better idea wold be to use a zinc bar or block, since it would last much longer and is far easier to get than magnesium ribbon.
An electrolyser could make H2 and the pure O2 to go with it, and it can produce the two indefinitely at a highly controllable rate. But that is a much more involved project. I don't know how much effort you are willing to put into this area, but a high-power electrolyser is a great project that has many uses besides making a hydrogen torch (cool as that is).
Again, only bad thing I see about you original idea is the reaction may go too quickly.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
its not that involved, just some scrap pvc put together, some arrestors and bubblers and there you have it. The power supply is the hardest part, im yet to find a good one.
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is this enough hydrogen?
