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When there is a fire in a space with high pressure air the fire is almost explosive.
When solid fuel like wood is put in a tube and is filled with compressed
air up to about 15 kg/cm2 = 14.710 Bar = 213,3 Psi
and you burn the wood it burn very fast and create a very high pressure.
Why cant I buy a system with tubes that i can load with solid fuel and get high exhaust gas pressure to run a electric generator?
Magi
I think the main problem is solid fuel has only burning rate - at least confined. One can vary the burn rate of wood by altering the oxygen content of the atmosphere in the burn chamber.
Most 'solid fuel' contains its own oxygen content (oxydizer) such as those solid fuels used in rockets or gunpowder. However, this type of fuel cannot be altered for burn rate except by changing the pressure level of the burn chamber, and typically cannot be turned off.
The other problem is that of duration. Either the system has a rather short burning time - meaning you have to load it often - or the system must 'charge up' and maintain a rather high internal pressure for sustained periods of time (all day or night? all week?) and vent it a bit at a time to spin the turbine.
As an example, a modern centerfire rifle (a solid fuel heat engine) operates at pressures in the 55,000 to 70,000 psi range. However, the nature of the beast is such it only lasts micro seconds. SCUBA tanks only run about 2,000 to 3,000 psi fully charged. It's merely a technological issue, but at the moment, I think there are other sources that are simpler to build and use.
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Lets say you build a cheap armored concrete tube on 1-2 cubic meter.
Lets say we load it with sawdust for fast burn and with compressed air at
about 15 kg/cm2 = 14.710 Bar = 213,3 Psi.
After the fast burn I get 3555.84 psi = 250 kg/cm2 .
Now I have pressure for a whole day to run a generator for my house.
Now what if I build a cheap armored concrete tube on 10- 20 cubic meter?
It would last a week.
And the sawdust/wood that is needed is for it is about 10 kg = 22.05 lb .
I want to buy that system.
It can be built quite safe with lots of valve that go off if the pressure gets to high.
MSc Magi
Magi, it sounds like you need to find some venture capital, perhaps a mechanical engineer and start making them hummers.
If it works the way you describe, it would be perfect for hunting cabins and vacation homes. One wouldn't have to run wire from the mainline to the location (a great expenditure) and be free of the concern of 'grid failure'.
It could be the "Magi Home Power System" and you could be stinking rich.