COAL DEASHING

• Main Authors: NISHI AKIO, USAMI MASAHIRO, OGURA TSUGITOSHI
• Format: Patent
• Language: English
• Published: 11.06.1983
• Subjects: ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; CHEMISTRY; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; NATURAL GAS; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE

PURPOSE:To deash coal in a shortened granulation time in a small apparatus, by classifying roughly crushed coal into coarse coal, fine coal and pulverized coal, and using a granule obtd. by pulverzation, oil addition, granulation and dehydration of the high-ash coarse and pulverized coals as a nucleus for oil addition/granulation of the low-ash fine coal. CONSTITUTION:Coal roughly crushed by a raw mill 1 is classified into coarse coal, fine coal and pulverized coal by a classifier 10. The coarse and pulverized coals of high ash content are introduced via line L1 into a pulverizer 2 and, after pulverized, introduced from a slurrying vessel 3 into an agitating granulator 4, in which they are granulated with supply of an emulsion from an emulsifying vessel 8, and then dehydrated by a dehydrator 9. The fine coal is intoduced via line L2 into a pulverizer 2A, while the dehydrated coal granule is introduced via the line L1 into the line L2. Although the primarily granulated coal is crushed again, it has a high granulating property and services as a nucleus, so that it is possible to shorten a granulation time, to decrease an amt. of added oil and to increase deashing rate.