The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 27, 1985
Filed:
Sep. 30, 1983
Michael I Sherman, Glens Falls, NY (US);
Kamyr, Inc., Glens Falls, NY (US);
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 For particles withdrawn from the bottom of the dehydration vessel the pressure is gradually reduced so that they do not explode, and then the liquid and particles are separated while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 Liquid is withdrawn from a screen at a central portion of the dehydration vessel and fed to the bottom of the heat exchange vessel, and liquid is withdrawn from a central screen of the heat exchange vessel, passed to flash tanks, a Lamella gravity settler, and a disk filter, sodium, sulfur, and other minerals in the withdrawn liquid being removed from the system.