• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • Anne Miller
  • Pearl Sutton
  • r ranson
  • Mike Haasl
  • James Freyr
stewards:
  • paul wheaton
  • Joylynn Hardesty
  • Burra Maluca
garden masters:
  • Steve Thorn
  • Greg Martin
gardeners:
  • Kate Downham
  • Jay Angler
  • thomas rubino

Rocket stove dryer oven

 
Posts: 5
Location: SOUTH AFRICA
trees wood heat homestead
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi all. We needed to dry faecal sludge prior to pyrolysis and have come up with a dryer prototype to dry out feedstock inside our ring kilns that make biochar. The objective is to decrease fuel consumption whilst driving out moisture. Believe it or not but our design is based on rocketmassheater design principles with the flue pipe creating the draft. Any thoughts are welcome.

Kobus
IMG_9558.PNG
[Thumbnail for IMG_9558.PNG]
Rocket inside ring kiln
IMG_9622.JPG
[Thumbnail for IMG_9622.JPG]
Dryer rocket construction
 
Posts: 136
11
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Is that an all-metal burn tunnel? The prevailing advice is: don't use metal in the burn tube and riser. It will function for a while, but eventually corrode.

Please read this thread - https://permies.com/t/40/52544/metal-burn-tunnel-heat-riser
 
gardener
Posts: 2649
Location: Cincinnati, Ohio,Price Hill 45205
215
forest garden trees urban
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
He has no insulation and  a short riser, plus he seems to putting preheated air into the riser.
I doubt it will get hot enough to wreck the metal anytime soon.

Kobus. are you taking it from sludge to bio-char in one burn?
 
Kobus Venter
Posts: 5
Location: SOUTH AFRICA
trees wood heat homestead
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Matt and William, new to this forum and still getting to grips with the layout. Matt thanks for the link it was useful, I am aware of metal corrosion inside a RMH but and as William also noted a lot of moisture will be present especially initially, and I really hope the central draft will cause enough "pull" on the exit gases to ensure a hot rocket burn, but not so hot as to warp the metal or cause it to burn through and deteriorate. It's all 5mm except the bottom which is 10mm through which the ash falls. No William this will be a dryer only. I am thinking of converting our current biochar kiln to using a rocket somewhere as it will save so much fuel. We use almost a ton of fuel to create the heat into the internal 55 gal drum retorts. The ring kilns are only 3mm and they don't last beyond 3 years, producing around 1 ton of biochar per month. Dr Hugh McLaughlin helped with the design. My main concern is if it will work - I guess time will tell. The sludge has over 60% moisture and we'll be putting it into 55 gal drums with perforated pipe spacing it out and hopefully allowing moisture to exit through it. The pilot project is externally funded and will start on the 7th of May. Will keep all here at permies in the loop with photos.
diamond.jpg
[Thumbnail for diamond.jpg]
Biochar kiln and chimney
IMG_9630-1-.JPG
[Thumbnail for IMG_9630-1-.JPG]
Bottom view of ash plate
 
Willie Smits increased rainfall 25% in three years by planting trees. Tiny ad:
A rocket mass heater is the most sustainable way to heat a conventional home
http://woodheat.net
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!