A process for gasifying carbonaceous products such as coal, oil, forest wastes, and municipal solid wastes, by reacting them with steam and oxygen (or air) at 950 to 1,100ºC, under 3 to 35 atm. The product gases are hydrogen, carbon monoxide, carbon dioxide, and some methane. The ash is agglomerated into rough spheres, hence the name of the equipment Ash Agglomerating Gasifier