• 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 cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Anne Miller
  • Nicole Alderman
  • r ranson
  • Pearl Sutton
  • Mike Haasl
  • paul wheaton
stewards:
  • Joylynn Hardesty
  • Dave Burton
  • Joseph Lofthouse
master gardeners:
  • jordan barton
  • Greg Martin
gardeners:
  • Carla Burke
  • Ash Jackson
  • Kate Downham

How come . . . ?

 
Posts: 68
Location: Essex, UK
3
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
How come . . . there's no (visible?) smoke comes out of the top of a rocket stove?
Long years ago I was taught that red/yellow/orange flames are that colour from unburnt carbon particles glowing in the heat i.e. soot.
Wood gas stoves mostly seem to burn with a blue flame, so are obviously efficient, but most rocket stoves seem to only have red/orange flames.
So, bottom line is, do rocket stoves make your pans sooty?

TIA
 
gardener
Posts: 717
Location: +52° 1' 47.40", +4° 22' 57.80"
115
woodworking rocket stoves wood heat
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Marion, welcome to permies.
In my opinion, the story about yellow/orange flames is only partly true. That color is caused by glowing particles in the flame, in effect, those being burned. When the stove is still producing soot and depose black goo in the flue or on the pans there's unburned material left in the exhaust gases. In a rocket heater all the processes like burning volatiles (blue flames) and burning carbon are happening all at the same time. The secret is the sideways flame which is causing a lot of turbulence, fiercely mixing the combustibles with incoming air. Even more important: the flame itself is always downstream from the fuel so everything need to pass through the flame zone.

All the above is about a rocket heater, the Evans' style J-tube. A rocket stove for cooking is a distant relative, works good most of the time but the pans and pots on the flame will get sooty. Not as much as an open fire, far from that, but nonetheless. The pot is cooling down the flame rigourously and it will get black. The j-tube rocket heater doesn't do such a thing, all is focused on completely burning of the fuel. Extracting of the heat is happening after the combustion is complete, not at the same time.
Different purpose, different construction and different results.
 
Marion Kaye
Posts: 68
Location: Essex, UK
3
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Belated thanks for posting!
Erica's thread on efficiency reminded me I had posted this Q
gift
 
Solar Station Construction Plans by Ben Peterson -- ebook
will be released to subscribers in: soon!
reply
    Bookmark Topic Watch Topic
  • New Topic