2760. REICHL, E. H., AND SAFFORD, R. V. (Pittsburgh Consolidation Coal Co.). Gasification of Carbonaceous Solids. British Patent 658,542, Oct. 10, 1951. Chem. Abs., vol. 46, 1952, p. 4203.

Carbonaceous solids are completely gasified to yield a H₂-CO mixture suitable for use as synthesis gas in the Fischer-Tropsch process. In the 1^st stage, pressurized steam from the product-gas heat exchanger is used to fluidize a bed of low-temperature coke, which is kept at 1,400°-1,800° F. by partially burning in a combustion zone a portion of the coke with air, also preheated by heat exchange. The unburned coke is removed from the flue gas by an internal cyclone and returned to the fluidized bed. In the 2d stage, the temperature of the heated coke is further raised by partly burning with O₂ in a powdered-fuel burner. The coke is finally gasified with the heated steam from the fluidizer. The temperature of the burner is maintained at 1,900°-2,500° F. for the nonslagging operation and 2,500°-3,000° F. for slagging.