Method and apparatus for steam drying of low-rank coals using a

Details Method and apparatus for steam drying of low-rank coals using a Method and apparatus for steam drying of low-rank coals using a

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 77, 34131, 34137, F26B 304

Patent

active

046011153

ABSTRACT:
Low-rank coals, such as lignite, are dried by evaporating interstitial water therefrom in a superheated steam flow countercurrently passed through a sealed rotary cylindrical vessel. A composite steam discharged from the vessel is partially condensed to remove an amount of water therefrom substantially equal to the amount of water removed from the coal, with a resultant flow of residual steam reheated and returned to the cylindrical vessel for further drying of low-rank coal.

REFERENCES:
patent: 1907569 (1933-05-01), Parr et al.
patent: 2666269 (1954-01-01), Parry
patent: 3744221 (1973-07-01), Ross
patent: 4052168 (1977-10-01), Koppelmann
patent: 4284476 (1981-08-01), Wagener et al.
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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