Method and apparatus for fluidized steam drying of low-rank coal

Details Method and apparatus for fluidized steam drying of low-rank coal Method and apparatus for fluidized steam drying of low-rank coal

1985-04-26

1986-07-22

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 32, 34 77, 34 57A, 34172, 34177, F26B 304

Patent

active

046011137

ABSTRACT:
A method and apparatus for drying of low-rank coals, such as lignite, where the coal is passed through a sealed vessel in a plurality of heated fluidized beds with fluidization effected by superheated steam flowing counter-current to the flow of coal. A composite steam is exhausted from the sealed vessel, partially condensed, to remove an amount of water about equal to that removed from the coal, and the steam reheated and recycled to the sealed vessel. The heating of the fluidized beds is by means of heat exchange tubes passing through the beds, with a fluid, such as methanol, heated for flow through the tubes, collected and in a cooled state used in the partial condenser, and then compressed to reheat the same for reuse in the heat exchange tubes.

REFERENCES:
patent: 1907569 (1933-05-01), Parr et al.
patent: 2666269 (1954-01-01), Parry
patent: 4052168 (1977-10-01), Koppelmann
patent: 4339306 (1982-07-01), Janusch
patent: 4379692 (1983-04-01), Weber et al.
patent: 4400176 (1983-08-01), Kuhta
patent: 4523388 (1985-06-01), Cuel
"A Study on Upgrading of Low Grade Coals by Heat Treatment" K. Toada et al.; Technical Review, Oct. 1982, pp. 259-266.
Steam Drying of Lignite; Stanmore et al., NTIS U.S. Dept. of Commerce, Springfield, VA 22161 (1982).
"Enriching Western Coals by Thermal Drying and Oil Treatment", Wegert et al., Coal Age, May, 1976, pp. 96-100.
Technical and Economic Study of Drying Lignite & Subbituminous Coal by the Fleissner Process; Harrington et al., U.S. Govt. Printing Off., 1942.

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