Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1983-09-30
1985-08-27
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 35, 34 86, F26B 300
Patent
active
045369690
ABSTRACT:
A method and apparatus are provided for the dehydration of low rank coal, such as lignite, utilizing hot water. Particles of low rank coal are preheated, entrained in liquid, fed to a high pressure feeder, and transferred into a high pressure loop leading to a heat exchange vessel, and at a pressure of about 500-1,000 psi. Particles discharged from the bottom of the heat exchange vessel pass to the top of a dehydration vessel. Water at a temperature (e.g. 250.degree.-260.degree. C. at 700 psi) sufficient to facilitate dehydration of the coal is fed to the bottom of the heat exchange vessel, and to the particles as they pass from the heat exchange vessel to the dehydration vessel. For particles withdrawn from the bottom of the dehydration vessel the pressure is gradually reduced so that they do not explode, and then the liquid and particles are separated while still at a temperature of about 180.degree.-200.degree. F. utilizing a vibrating dewatering screen, Vortex sieve, and vibratory centrifuge. Liquid is withdrawn from a screen at a central portion of the dehydration vessel and fed to the bottom of the heat exchange vessel, and liquid is withdrawn from a central screen of the heat exchange vessel, passed to flash tanks, a Lamella gravity settler, and a disk filter, sodium, sulfur, and other minerals in the withdrawn liquid being removed from the system.
REFERENCES:
patent: 3007254 (1961-11-01), Schuster
patent: 3552031 (1971-01-01), Evans et al.
patent: 3802956 (1974-04-01), Backlund
patent: 3982789 (1976-09-01), Funk
patent: 4124440 (1978-11-01), Sherman
patent: 4514910 (1985-05-01), Elmore et al.
Derammelaere et al. article, "Mechanical Dewatering, Thermal Drying, and Dust Collection: An Integrated Approach", pp. 19-24.
Miscellaneous brochures for Vortex Sieve, Lamella Gravity Separator, and Vibratory Centrifuge.
Kamyr Inc.
Schwartz Larry I.
Westphal David W.
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