Process for gas production from solid fuels

Claim 1

A single, overall process for producing gas from a solid fuel containing portions thereof in the form of lumps, granules, and dust, in a reaction compartment provided with a fixed bed gasification zone, a fluidized bed gasification zone positioned above the fixed bed gasification zone, and a dust gasification zone positioned above the said fluidized bed gasification zone, all of said zones communicating with each other, said reaction compartment being also provided with means for injecting a gaseous medium for gasifying said fuel portions in each of said zones, said process comprising feeding said solid fuel into the fluidized bed gasification zone while simultaneously injecting a gasification medium into each of said zones, whereupon (a) the lumpy portion of the fuel falls into the fixed bed gasification zone and is partly gasified when the lumpy portion moves counter-current to the medium injected into the fixed bed gasification zone, and the formed gases along with the carbonization products, are carried into the fluidized bed gasification zone; (b) the granular portion of the fuel is partly gasified in the fluidized bed gasification zone by the gasification medium injected therein, while the carbonization products carried along from the fixed bed gasification zone are cracked in said fluidized bed gasification zone; and (c) the dust portion rises into the dust gasification zone and is partly gasified by the gasification medium injected into this zone which gasification medium includes oxygen.