Sunday, April 7, 2013

A rocket stove for the greenhouse - do feed back to me if you build one yourself

Finished stove from the firebox end I have used the top
of the acetylene bottle for more mass above the
gas bottle
This is a brief series of pictures of the construction of a rocket stove with masonry mass heat storage.   I will be putting a fuller description of the construction process on our website ( when I have time.

The Stove components are ;
A 2 ft cylinder cut from an acetylene bottle and a bottle gas bottle (do take great care if you do use either of these cylinders - danger of lethal explosion!)
Ordinary house bricks (out of a skip)
about 4 foot of 7 inch flexible stainless flue liner (out of a skip)
Fire clay  (from eBay)
bits and pieces and a frying pan for the lid of the firebox.
The internal flue pipe is single skin steel (scrounged) and the outside chimney is twin wall stainless flue (from eBay - not cheap but take your time and you can find bargains.
The heat storage is made by building a brick wall next to the indoor part of the flue (runs along the whole length of the greenhouse floor) and filling the gap with gravel and concrete slabs.

Base of the stove - bricks on concrete slab on top of rockwool insulation

After the bricks laid with fire clay - I later enlarged the firebox  which
I found too small

The gas bottle with the top cut off with a jigsaw (this will end up the other way up) and the acetylene cylinder cut with a disk cutter after it has been  filled with water to ensure there is no acetylene left inside!

Looking down inside the gas bottle barrel showing the inner barrel of stainless flexible flue pipe which is insulated with ceramic fiber insulation (i had in the workshop but available from eBay) then the acetylene cylinder then a gap and lastly the gas bottle

the hole cut at the base of the gas bottle to allow the flames to travel out to the flue pipe

Carefully shaped piece of flexible flue pipe to bridge then gap  from bottle to flue.   The whole  assembly covered with a mix of sand , cement, and fire clay

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