But if you do this those light molecules will eventually get jostled to
the top and then hop into the air space in the container above the
surface of the liquid eventually building up pressure in the closed
container until it reaches the vapour pressure of the more volatile
liquid (at that temperature) where it will stabilize with an equal
number of molecules evaporating and dissolving back into the liquid.
When you open the container you will hear a little hiss and you will
release a puff of explosive vapor into the local area. Or if the
container is open eventually the gas will all evaporate out of your
BD. If you cut it with kerosene which still has a vapor pressure that
is low at room temperature you will have to use more but it will tend
to stay as mixed and will not be as hazardous. If you spill some, you
will not have to worry about a static discharge in your sweater blowing
you to kingdom come as you scrub it off the floor.
Joe
bob allen wrote:
Howdy Mike,
Mike Weaver wrote:
I've done some initial research but haven't delved into one. Sooner or
later I'll find an oil furnace someone is throwing away and see what I
can do.
If I had to cut the BD with another agent to make it easier to use I
would do that. Does anyone have any suggestions? Gasoline?
I have 55 gallons of 99% Isopropyl alcohol - is that suitable?
The vapor pressure of a mixture of liquids is the weighted average, by
mole fraction, of the vapor pressures of the contributing liquids. (the
vapor pressure is the tendency of a liquid to turn in to a gas- the
boiling point of a liquid is defined as the point when the vapor
pressure of a liquid equals atmospheric pressure) Hence one would want
to mix the most volatile, flammable liquid you can that is miscible with
the biodiesel.
If I were doing it I would start my mixing small amounts of white gas or
gasoline with the biodiesel until I got the minimum proportion which
supported combustion under the desired conditions.
Isopropyl alcohol would work, but I think it has a higher vapor
pressure and lower heat of combustion than gasoline so it would take a
higher proportion to achieve the same effect.
-Mike
Zeke Yewdall wrote:
What about the type of burners that are designed to use a liquid fuel
directly rather than volatilize a liquid fuel? Like fuel oil
furnaces, and waste engine oil burners. All of these I have seen are
in the 100,000 Btu/hr range though -- if you could find one more like
10 or 20 kBtu, it might work well for heating the reactor.
http://www.espar.com/ something like this may be able to be modified.
Not cheap though.
On 12/6/06, Joe Street <[EMAIL PROTECTED]> wrote:
Uh.......outdoors?? I dunno but it was warm in my basement..... :-[
J
Mike Weaver wrote:
What was the temperature outside? I tried that with a torch and got a
few sputters but no flame.
Is kerosene the most logical agent to cut the BD with?
Joe Street wrote:
Hi Mike
For what it's worth I tried running my multifuel backpacking stove on
BD. I had to warm the preheater / vaporizer tube with a propane torch
to get it hot enough to vaporize the BD. Once lit though it had a
beautiful and stable blue flame and judging by boil time comparisons
roughly the same heat as kerosene. Esters have a high flash point and
need a lot of heat to use in a stove that is designed to supply vapor
to the jet.
Joe
Mike Weaver wrote:
So far all attempts to light it have failed. It's 30 degrees here and
that may have something to do with it. I cut the BD w/ a good shot of
Dino diesel and still no go. I got the preheater going but no flame on
the ring. I brought it inside overnight to warm up and will try it
again. If it doesn't go I'll mix in some kerosene. The booklet says
you have to preheat for 3 1/2 mins sometimes to get BD lit. It came
smelling of kerosene to I expect the factory lit it and tested it. FWIW
the pressure gauge is bad but it does hold pressure.
I had hoped to use it to heat oil so the the bd process was all fueled
by BD.
I also looked at some of the camping stoves but they are very expensive
and designed to be as light weight as possible. The guy at the camping
store said the thinner distillates works best.
We'll see,
Mike
Ken Dunn wrote:
Please, let us know how it does, Mike.
Take care,
On 12/5/05, Mike Weaver <[EMAIL PROTECTED]> wrote:
Just got a Britelyt today. Haven't been able to get it to light on BD
but I think it may be due to the fuel being too cold. Will report back
if I get it going.
Ken Dunn wrote:
What is everyone using as a heat source for preheating? I'm thinking
about buying the BriteLyt mentioned on JtF. I could use it for other
purposes as well which would be nice. Anyone test it? Care to
comment?
Take care,
Ken
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