Method for using fast fluidized bed dry bottom coal gasification

Details Method for using fast fluidized bed dry bottom coal gasification Method for using fast fluidized bed dry bottom coal gasification

1982-01-28

1983-08-23

Lindsay, Jr., Robert L.

Gas: heating and illuminating

Processes

Fuel mixtures

48 62R, 48 63, 48203, 48206, C10J 300

Patent

active

044001819

ABSTRACT:
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.

REFERENCES:
patent: 3840353 (1974-10-01), Squires
patent: 3847563 (1974-11-01), Archer et al.
patent: 3876392 (1975-04-01), Kalina et al.
patent: 4032305 (1977-06-01), Squires
patent: 4077778 (1978-03-01), Nahas et al.
patent: 4312638 (1982-01-01), Koump

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