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Title: Method for using fast fluidized bed dry bottom coal gasification

Carbonaceous solid material such as coal is gasified in a fast fluidized bed gasification system utilizing dual fluidized beds of hot char. The coal in particulate form is introduced along with oxygen-containing gas and steam into the fast fluidized bed gasification zone of a gasifier assembly wherein the upward superficial gas velocity exceeds about 5.0 ft/sec and temperature is 1500.degree.-1850.degree. F. The resulting effluent gas and substantial char are passed through a primary cyclone separator, from which char solids are returned to the fluidized bed. Gas from the primary cyclone separator is passed to a secondary cyclone separator, from which remaining fine char solids are returned through an injection nozzle together with additional steam and oxygen-containing gas to an oxidation zone located at the bottom of the gasifier, wherein the upward gas velocity ranges from about 3-15 ft/sec and is maintained at 1600.degree.-200.degree. F. temperature. This gasification arrangement provides for increased utilization of the secondary char material to produce higher overall carbon conversion and product yields in the process.
Authors:
 [1] ;  [2]
  1. (Fords, NJ)
  2. (Lawrenceville, NJ)
Publication Date:
OSTI Identifier:
864676
Report Number(s):
US 4400181
DOE Contract Number:
AC21-80MC14880
Resource Type:
Patent
Research Org:
HYDROCARBON RESEARCH INC
Country of Publication:
United States
Language:
English
Subject:
method; fast; fluidized; bed; dry; bottom; coal; gasification; carbonaceous; solid; material; coal; gasified; fast; fluidized; bed; gasification; utilizing; dual; fluidized; beds; hot; char; coal; particulate; form; introduced; oxygen-containing; gas; steam; fast; fluidized; bed; gasification; zone; gasifier; assembly; upward; superficial; gas; velocity; exceeds; temperature; 1500; degree; -1850; degree; resulting; effluent; gas; substantial; char; passed; primary; cyclone; separator; char; solids; returned; fluidized; bed; gas; primary; cyclone; separator; passed; secondary; cyclone; separator; remaining; fine; char; solids; returned; injection; nozzle; additional; steam; oxygen-containing; gas; oxidation; zone; located; bottom; gasifier; upward; gas; velocity; ranges; 3-15; maintained; 1600; degree; -200; degree; temperature; gasification; arrangement; provides; increased; utilization; secondary; char; material; produce; overall; carbon; conversion; product; yields; process; product yields; carbonaceous solid; cyclone separator; cyclone separator; cyclone separator; gasification zone; bed gasification; bed gasification; fluidized beds; arrangement provides; oxygen-containing gas; oxygen-containing gas; fluidized bed; fluidized bed; fluidized bed; fluidized bed; fluidized bed; solid material; coal gasification; particulate form; containing gas; containing gas; coal gas; effluent gas; gas velocity; gas velocity; zone located; injection nozzle; fast fluidized; fast fluidized; fast fluidized; hot char; gasification arrangement; secondary char /48/