David R Gady

US Patent:

20110220846, Sep 15, 2011

Filed:

Jan 14, 2010

Appl. No.:

12/687639

Inventors:

Gary M. Banowetz - Corvallis OR, US
Hossien El-Nashaar - Corvallis OR, US
Jeffrey J. Steiner - Annapolis MD, US
David Gady - Rockford WA, US

International Classification:

C01B 3/02
B01J 7/00

US Classification:

252373, 422129, 422232, 422234, 422167

Abstract:

A non-densified feedstock is fed into a modified countercurrent gasifier, and syngas and char are produced from an upper portion of the gasifier. In the preferred embodiment, propane gas is injected into a lower portion of the gasifier as unconsolidated straw feedstock is metered into a gasifier feedstock inlet. The feedstock is converted into syngas and char in a combustion section of the gasifier. A portion of the syngas and char is recycled within the gasifier. After the syngas and char flow out of a gasifier production outlet, the char is separated from the syngas in a cyclone separator. The syngas is used to produce power at the facility where the syngas is produced.