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Rocket mass heater for drying firewood in a large kiln  RSS feed

 
Frank Blaker
Posts: 6
Location: Somerset, england
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I am aiming to build a firewood drier using a rocket mass heater floor, slab wood walls and a tarp roof. I have seen a shipping container and biomass boiler combo advertised that claims to get fresh cut ash down to 20% in a seven day period. I would see this high tech biomass stove and steel container as the commercial end of a spectrum. I would like to operate at the bottom end of the spectrum and develop, then share a design to dry timber in a week for the price of sustainably sourced, low cost and reclaimed material. Anyone out there got thoughts on the science here?
We operate a mobile sawmill and forestry team and would like to enable small landowners to use waste wood to dry firewood they can then sell. If promoting rocket mass heat technology can come into the scenario so much the better.
I currently have a feeling that a pair of rocket stoves using 55 gallon steel drums over firebrick risers will be worth attempting to heat and dry four cords at a time. I also think an air permeable mass using loose piled brick an d gravel in a timber box with air intakes at the bottom may be the best way to use the rockets to create a warm dry air flow over the firewood grain ends.
All thoughts are welcome on this one. I hope to solve the problems to the point of an experimental structure by mid December.
 
Jay C. White Cloud
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Thanks for sharing this...

Do please, share the outcomes of what you discover and photos of the project process.

Regards,

j
 
Joe Braxton
Posts: 320
Location: NC (northern piedmont)
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This might give you some ideas......


http://www.aprovecho.org/public/Publications/Still-The.Winiarski.Wood.Fired.Agricultural.Food.Dryer.pdf


The "double chimney" might be just the thing to get the moisture out.
 
Frank Blaker
Posts: 6
Location: Somerset, england
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Thanks joe, really useful.

Regards

Frank
 
Frank Blaker
Posts: 6
Location: Somerset, england
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Thank you for the link Joe,
I can see so much solved in the food drier, and so much careful research there. I think I need to go down the route of a loose laid brick mass for a rocket mass heater, this is to make the kiln transportable and for the experimental period adjustable. If I lay the bricks looser at the edge as to encourage air channels to pick up heat and take it into the kiln, micro adjust the air channels to allow for heat collecting sooner nearer the burner and use slab wood louvres to form the kiln walls, combine this with a double wall chimney to vacuum wet air out of the kiln. And a steeply sloped tarp roof to allow condensate to drip outwards I may have a design.
I live in a hilly region and woodlands tend to be on slopes as this intensively farmed country has most flatland cleared for agriculture. I'm thinking I could build the rocket on a slope so the insulated riser feeds straight into the mass, allow for a high temperature at this point in the mass by creating a double floor with scrap steel plate, and have an extra large firebox to allow for less frequent stoking. Maybe being on a slope so the heated air doesn't have travel down inside an old barrel will mean the rocket doesn't need the energy to push the gases through so much.
Thanks again for the link, any further thoughts are very much appreciated.

Frank
 
It would give a normal human mental abilities to rival mine. To think it is just a tiny ad:
Rocket mass heaters in greenhouses can be tricky - these plans make them easy: Wet Tolerant Rocket Mass Heater in a Greenhouse Plans
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