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.
- Research Organization:
- Hydrocarbon Research, Inc., Lawrenceville, NJ (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC21-80MC14880
- Assignee:
- Hydrocarbon Research, Inc. (Lawrenceville, NJ)
- Patent Number(s):
- 4,400,181
- Application Number:
- 06/343,626
- OSTI ID:
- 864676
- Country of Publication:
- United States
- Language:
- English
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