TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Composition: The syngas contains a mixture containing carbon monoxide and hydrogen, and a mixture containing a gas reformer product. The oxygen-enriched gas contains at least 60 mol% of oxygen, preferably 90 mol% of oxygen. The homogeneous mixture of steam and oxygen-enriched gas contains artificial air having 15-60 mol%, preferably 15-40 mol%, of oxygen. The produced syngas contains carbon monoxide, carbon dioxide, hydrogen, methane and water, and is nitrogen-free.Preferred Compound: The carbonaceous fuel burned in the burner contains a portion of liquid petroleum product, gaseous hydrocarbon fuel and/or produced syngas.Preferred Property: The quantities of oxygen in artificial air and homogeneous mixture are substantially stoichiometric and super stoichiometric with respect to quantity of substantially ash-free carbonaceous fuel, respectively. The quantity of oxygen in homogeneous mixture is 10% greater than stoichiometric with respect to quantity of ash-free fuel.Preferred Condition: Water vapor and/or oxygen is pre-heated, before contact with fuel. The temperature of ultra-superheated steam composition is 2400-5000 degrees F, and the superheated steam is clear and colorless. The carbonaceous material is gasified at a reactor temperature of 1200-2800 degrees F.Preferred Material: The carbonaceous gasifier feedstock material comprises coal, coke, biomass, liquid petroleum fraction, liquid cracking product, gaseous hydrocarbon and refinery waste material.Preferred Method: The produced syngas is scrubbed, cooled and dried. The dried product gas is fractionated into a fraction containing carbon monoxide, and other fraction containing hydrogen. At least a portion of any one fraction is recycled to burner to comprise at least a portion of ash-free burner fuel. The burner fuel contains recycled syngas which is water saturated below 300 degrees F. Carbonaceous material containing granulated coal is injected into reactor by atomization for gasification.