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

1986-07-29

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

046024387

ABSTRACT:
A method and apparatus for drying 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 countercurrent to the coal flow. A composite steam is exhausted from the sealed vessel and passed to a vessel where water is sprayed therein to cool the same and remove occluded solids. A first portion of the steam is then reheated and returned to the sealed vessel as fluidizing steam, while a second portion of the steam is heated and passed through heat exchange tubes in the sealed vessel to heat the fluidizing coal, with the second portion, after passage through the heat exchange tubes discharged from the system.

REFERENCES:
patent: 1907569 (1933-05-01), Parr et al.
patent: 2666269 (1954-01-01), Parry
patent: 4052168 (1977-10-01), Koppelmann
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patent: 4400176 (1983-08-01), Kutta
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, US 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., US Govt. Printing Off; 1942.

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