Andrew
I was once uncomfortably close to an explosion of hydrogen peroxide
rocket fuel so I am puzzled about you saying it is not exothermic.
XXXXing dangerous I would agree.
Stephen
Emeritus Professor of Engineering Design. School of Engineering.
University of Edinburgh. Mayfield Road. Edinburgh EH9 3JL. Scotland
[email protected] Tel +44 (0)131 650 5704 Cell 07795 203 195
WWW.see.ed.ac.uk/~shs YouTube Jamie Taylor Power for Change
On 28/01/2015 15:32, Andrew Lockley wrote:
Any sulphur SRM scheme involves distribution of sulphur compounds into
cold, low pressure air.
Naturally, you don't want to lift sulphur that's at low pressure, or
you'll need some huge container to lift it with. You want to lift
something nice and dense.
BUT you want the sulphur to come out of the delivery vehicle at
roughly ambient temperature and pressure. If there's a large pressure
drop, it cools enormously, and basically ends up as snow. This falls
rapidly through the air, wasting the money you've spent to lift it.
If you heat the gas before lifting it, the vessel pressure ends up
being absolutely bonkers. You can't practically build anything that
holds it at the necessary pressure, and gets it to the stratosphere in
one piece.
You can use aircraft, which can have complex heaters and pressure
vessels on board - thus sorting out this issue in mid air. However,
for simpler technologies such as shells, hoses, etc. this is
potentially a big problem.
A way round this is to use a chemical reaction to put heat in any the
right time (during ejection).
But what to use?
Sulphur burns well in air, so you can use oxygen. But liquid sulphur
is hot, and liquid oxygen is very cold. Handling them together is
therefore very difficult. Hydrogen peroxide might work, but the
reaction isn't as exothermic. If you don't want to use molten sulphur,
the fuel would have to be a sulphur powder with a fuel suspension
fluid (maybe mineral oil), or maybe some kind of solid fuel rocket
motor, which burns sulphur on the inside of a tube.
Any help on this would be very useful. I've got a nearly-finished
paper on this issue, now basically stalled for lack of a solution.
A
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