Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
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.
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"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.
Draper Robert
Wolfe Robert W.
Abeles Daniel C.
Schwartz Larry I.
Westinghouse Electric Corp.
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