829. ------. [GOROWSKI, E. J., AND NELSON, K. J.] (Standard Oil Development Co.). Gasification of Carbonaceous Solids. United States Patent 2,633,417. Mar. 31. 1953: appl. filed Feb. 28. 1952. Serial No. 273,986: 14 claims (Cl. 48-206). Chem. Abs.,

Patent Abstracts

829. ------. [GOROWSKI, E. J., AND NELSON, K. J.] (Standard Oil Development Co.). Gasification of Carbonaceous Solids. United States Patent 2,633,417. Mar. 31. 1953: appl. filed Feb. 28. 1952. Serial No. 273,986: 14 claims (Cl. 48-206). Chem. Abs., vol. 47, 1953. p. 6122.

Carbonaceous solids to be gasified are dried and preheated in direct heat exchange with hot gases produced in the gasification stage. The gases flow upward through 2 or more fluidized beds of solids to which the solids feed is supplied countercurrently to the gases that serve simultaneously as heating and fluidizing medium. The process allows utilization of the available waste heat of the product gases at different temperature levels in an order affording the greatest heat transfer efficiency and maximum heat recovery. The savings of O₂ and process coal may amount to 10-20%. Carbonaceous solids are gasified at a relatively high C concentration of 30-70% by weight of the solids held in the gasification zone. C losses are avoided by feeding the high C gasification residue directly to the combustion zone where their sensible and potential heat content is converted into steam. In this way the generator size is kept at a minimum. About 15,000-30,000 B. t. u. of sensible heat per 100 lb. coal fed to the generator.

GOTTSCHALL, W. See abs. 2141, 2142, 2143.