Coal pulverizer and method of improving flow therein

  • US 5,873,156 A
  • Filed: 11/01/1996
  • Issued: 02/23/1999
  • Est. Priority Date: 10/13/1993
  • Status: Expired due to Term
First Claim
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1. In a coal pulverizer having a classifier system, the system including a coal feedpipe to deliver raw coal to pulverizing structure from an outlet spaced above the pulverizing structure, a classifier cone positioned around the feedpipe to deliver oversize coal to the pulverizing structure from a classifier cone outlet spaced above the pulverizing structure, the pulverizer delivering ground coal to an upper end of the classifier cone by an upwardly-directed flow of air traveling around and above the pulverizing structure, the improvement comprising:

  • a classifier cone extension extending from the classifier cone outlet into the pulverizing structure to a point where coal flow from the classifier cone extension is not affected by the flow of air up and around the pulverizing structure from the pulverizing throat, the cone extension having a throat, and the feedpipe outlet being positioned within the cone extension above the throat, wherein the feedpipe is mounted vertically within the classifier cone concentric with the cone extension and throat to define an annular reject fine flow path between the feedpipe outlet and the classifier cone extension above and adjacent the throat.

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