Newsletter 7.22.20
Aprovecho Research Center
Aprovecho Research CenterCottage Grove, Oregon, 97424 - USA
Using a bellows to blow air up into a bed of charcoal allowed the Romans to generate temperatures of around 1,100C in a forge. In medieval England, pre-heating the air and switching to coke, a cleaner burning version of coal, resulted in the higher temperatures needed to manufacture iron in a blast furnace. In 2007, Aprovecho tested the WoodFlame stove with only bottom air jets and found that it was as clean burning as the WoodGas forced draft TLUD stove designed by Dr. Tom Reed. As part of a Department of Energy project, (2013-2015) ARC made an under-air rocket stove with bottom air jets based on the blast furnace approach. This stove concept evolved into the SSM Jet-Flame, an accessory that slides under a fire in a stove or in the Three Stone Fire.
Under-air Rocket with chimney
The Jet-Flame www.Jet-Flame.com
When the Jet-Flame is used with a Three Stone Fire the jets of air blow up into the made charcoal improving the mixing of woodgas, air, and flame in a zone of intense heat. The combination of molecular mixing, higher temperatures in the combustion zone, and sufficient residence time results in dramatically reduced emissions and higher temperatures delivered to the cooking pot.
See the Jet-Flame Three Stone Fire: https://youtu.be/87Ltz3kCY9w
by Dean Still on July 22nd, 2020
Aprovecho Research Center