PURPOSE: To prepare deashed granulated coal having a large particle diameter, with a smaller amount of an oil-based binder and reduced power consumption, by separating a slurry after 1st-step granulation into oil-containing granular coal and ash-containing slurry and performing 2nd-step stanulation of the oil-containing granular coal in a liquid.
CONSTITUTION: A dust coal slurry is prepared by adding water 3 to dust coal 2 and an oil-based binder 6 is added to it, followed by mixing in a line mixer 5. The resultant mixed slurry is granulated in a liquid in a 1st granulating machine 7. The granulated slurry is classified with a screen 4 while it is washed with sprayed water, and is dehydrated for separation into 1st-stage granulated coal, ash and slurry. The resultant oil-containing granulated coal is led into a concentration adjustment tank 12 and water is added to it to a predetermined concentration. The 1st-stage granulated coal slurry is sent into a 2nd granulating machine 15. Without addition of any binder, the slurry is grannulated at a revolution rate which is about one-fifth of that in the 1st granulating machine for formation of pellets having predetermined particle diameters and deashing. The treated slurry is classified with a screen 17, washed, dehydrated and separated into 2nd-stage granulated coal, ash and slurry to produce an oil-containing granulated coal with a low ash content.
MURATA MICHIAKI
MIWA TSUNAHISA
NAKANISHI TAKESHI
ASAKURA YOSHIYUKI
KAWADA SHIN
TANAKA MINORU
HITACHI SHIPBUILDING ENG CO
MITSUI MIIKE MACHINERY CO LTD
BABCOCK HITACHI KK
NAGATA SEISAKUSHO CO LTD
| JPS57190092A | 1982-11-22 | |||
| JPS58134190A | 1983-08-10 |