5-gallon rocket stove burner

Erin Rasmussen

David Yarrow and Jim Welch, June 2010

Last summer, Jim Welch built a rocket stove on a concrete pad in my backyard to make biochar in a 55/30-gallon nested kiln & retort. this first test of a hybrid biochar burner was a great success, despite a few troublesome difficulties with the process, beginning with having large, still-moist logs of red pine timber for feedstock.

This spring, Jim scaled his experiment down to a 5-gallon retort nested in an 18-gallon kiln, with a shoebox-size rocket stove to fire up the retort. last saturday jim brought his modest unit to my biochar workshop at Saratoga apple, and gave us an inspiring demonstration of how simple, effective and easy pyrolysis can be:

Read more at http://www.carbon-negative.us/JWelch/

Jim's new rocket stove is quite smallinline inline-center