JPS54146801A - Removal of water from brown coal - Google Patents

Abstract

PURPOSE: To remove water from brown coal without heating, by granulating brown coal with relatively high water content into a suitable particle size, follwed by pressing it mechanically at a pressure of not less than specific temperature.

CONSTITUTION: Brown coal with water content of not less than 15 wt. % (remarkable effect can be obtained in the case of water content of 60W70 wt. %) is granulated into an average particle diameter of 2W10 mm and pressed mechanically to separate water, which is removed from the system. One of devices available is a type wherein the coal is pressed between a pestle and a mortor, for example, a batch type device wherein a top and a bottom pestles are set on the top and the bottom parts of the mortar and a rotary type device wherein the coal is pressed between two rollers rotating in the opposite directions. In the batch type device, the clearance between the mortar and the postle is preferably 0.03W0.1 mm and the pressure of pressing is preferably 200W10,000 Kg/cm²G. In the rotary type device, the pressure of pressing is preferably 200W10,000 Kg/cm.roll width. This invention removes water from the brown coal from water content of 60W70 wt. % to that of 30 wt. % with ease.

COPYRIGHT: (C)1979,JPO&Japio