The present invention discloses a gasifier and/or a gasification process that provides a long, uniform temperature zone in the gasifier, regardless of the particle size, chemical composition, and moisture content of the fuel by sandwiching a reduction zones between two oxidation zones. The gasifier and/or gasification process has a char that is more energy-dense and almost devoid of moisture that affords for an additional (or char) oxidation zone with a temperature that is higher than a first oxidation zone which is closer to a evaporation and devolatilization zone. As such, the additional (or char) oxidation zone contributes to augmenting the reduction zone temperature, thereby providing a favorable dual impact in improving syngas composition and near-complete conversion of the tar.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with government support from the U.S. Department of Energy under Cooperative Agreement No. DE-FC26-05NT42465 entitled "National Center for Hydrogen Technology" and the U.S. Army Construction Engineering Research Laboratory under Cooperative Agreement No. W9132T-08-2-0014 entitled "Production of JP-8-Based Hydrogen and Advanced Tactical Fuels for the U.S. Military." The government has certain rights in the invention.