Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1983-02-22
1985-05-07
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 20, F26B 300
Patent
active
045149100
ABSTRACT:
A method and apparatus are provided for the dehydration of low rank coal, such as lignite. The coal is formed into particles having a size of less than about 4 inches, is subjected to atmospheric steaming, and then preheating with steam at a pressure of about 20-100 psig. The particles are then entrained in liquid and fed to a high pressure feeder at which they are transferred to a high pressure circulation loop, at a pressure of between about 300-1500 psig. The particles and liquid are fed to a liquid/particles separator at the top of a vertical dehydrating vessel, and the particles at the top of the vessel are contacted by saturated steam. Condensed steam and particles flow downwardly in the dehydration vessel, and are subjected to a counter-current wash at the bottom of the vessel. A slurry of liquid and particles discharged from the bottom of the dehydration vessel has the pressure thereof gradually reduced in a second high pressure feeder, and is transferred to a low pressure loop at a pressure of between about 20-100 psig. The liquid and particles are separated, and then the particles are subjected to evaporative cooling.
REFERENCES:
patent: 1632829 (1927-06-01), Fleissner
patent: 1679078 (1928-07-01), Fleissner
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: 4125384 (1978-11-01), Funk
patent: 4322184 (1982-03-01), Funk et al.
patent: 4401436 (1983-08-01), Bonnecaze
Stanmore et al., "Steam Drying of Lignite: A Review of Processes and Performance"; Technical Information Center, U.S. Dept. of Energy; Document DOE/GFETC/RI-82/1, 1982.
Oppelt et al., "Drying North Dakota Lignite to 1,500 Pounds Pressure by the Fleissner Process"; Bureau of Mines Report 5527, 1959.
Elmore Carl L.
Funk Erwin D.
Kamyr Inc.
Schwartz Larry I.
Westphal David W.
LandOfFree
Dehydration of lignite or the like does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dehydration of lignite or the like, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dehydration of lignite or the like will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1791838