B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
241/26
B02C 23/10 (2006.01) B02C 23/14 (2006.01) B03B 9/00 (2006.01) B03C 7/00 (2006.01) B07B 9/00 (2006.01) F23K 1/00 (2006.01) B02C 15/00 (2006.01)
Patent
CA 1228340
PROCESS FOR REMOVAL OF TROUBLESOME MINERAL MATTER ABSTRACT OF THE DISCLOSURE A system for pulverizing coal to be burned in a furnace (20), where nearly all of the coarse ash particles are removed from the coal prior to its introduction to the furnace. The system includes a pulverizing mill (10) having a first classifier (12) in its outlet for separating some of the large, heavy particles and returning them to the pulverizer. A second classifier (16) is connected to the first classifier, and includes a curved duct (68) wherein the solid particles being carried in an airstream are thrown outwardly against an outer wall. A skimmer blade (78) extending through the outer wall skims off a percentage of the large, heavy particles, the percentage depending on how much coarse ash the coal stream contains. The rest of the coal particles are conveyed to a furnace and burned therein. The separated large, heavy particles are passed through an ionizer (30) and then through an electrostatic separator (34), where the inorganic particles are separated from the coal particles. The coal particles can then be conveyed to the furnace or sent back to the pulverizer for further grinding.
453089
Alstom Power Inc.
Smart & Biggar
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