System, method and apparatus for upgrading a pulverizer

Patent metadata

Field	Value
Publication number	US-2017361328-A1
Application number	US-201615188342-A
Country	US
Kind code	A1
Filing date	Jun 21, 2016
Priority date	Jun 21, 2016
Publication date	Dec 21, 2017
Grant date	—

Abstract

A method of upgrading a vertical spindle pulverizer includes the steps of removing a cover from a journal opening in a housing of the pulverizer to access a grinding zone of the pulverizer, removing a first journal assembly having a toroidal grinding roll from the pulverizer through the journal opening, removing a plurality of toroidal table segments from a grinding table of the pulverizer, installing a plurality of inclined bull ring segments on the grinding table, installing a second journal assembly having a conical grinding roll in the pulverizer, and replacing the cover over the journal opening. The inclined bull ring segments are configured to register with a grinding surface of the conical grinding roll.

First claim

What is claimed is:

1 . A method of upgrading a vertical spindle pulverizer, comprising the steps of:
removing a cover from a journal opening in a housing of the pulverizer to access a grinding zone of the pulverizer; removing a first journal assembly having a toroidal grinding roll from the pulverizer through the journal opening; removing a plurality of toroidal table segments from a grinding table of the pulverizer; installing a plurality of inclined bull ring segments on the grinding table; installing a second journal assembly having a conical grinding roll in the pulverizer; and replacing the cover over the journal opening; wherein the inclined bull ring segments are configured to register with a grinding surface of the conical grinding roll.

2 . The method according to claim 1 , further comprising the step of:
installing a stop bolt on the cover prior to replacing the cover; wherein the stop bolt is configured to determine a spacing between the conical grinding roll and the inclined bull ring segments of the grinding table.

3 . The method according to claim 2 , further comprising the step of:
removing a journal spring assembly of the pulverizer prior to removing the first journal assembly.

4 . The method according to claim 3 , further comprising the step of:
installing the journal spring assembly on the cover after installing the stop bolt and prior to replacing the cover.

5 . The method according to claim 1 , wherein:
the second journal assembly includes a bolted connection between a journal shaft and pivot bracket of the journal assembly.

6 . The method according to claim 1 , wherein:
the step of installing the second journal assembly in the pulverizer includes mounting the second journal assembly to a pivot bracket on which the journal assembly is configured to pivot via two opposed pivot shaft segments.

7 . The method according to claim 6 , wherein:
the opposed pivot shaft segments are spaced from one another and do not extend a length of the pivot bracket.

8 . The method according to claim 1 , further comprising the step of:
adjusting the rotational speed of the grinding table in dependence upon the geometry of the conical grinding roll.

9 . A method for increasing the capacity of a vertical spindle pulverizer, comprising the steps of:
removing a cover from a journal opening in the pulverizer to access a grinding zone of the pulverizer; removing a first journal assembly having a generally toroidal grinding roll from the pulverizer through the journal opening; removing a plurality of generally toroidal table segments from a grinding table of the pulverizer; installing a plurality of generally inclined bull ring segments on the grinding table; installing a second journal assembly having a conical grinding roll in the pulverizer; and replacing the cover over the journal opening.

10 . The method according to claim 9 , wherein:
the step of installing the second journal assembly having the conical grinding roll includes:
inserting the second journal assembly having the conical grinding roll through the journal opening;
arranging the second journal assembly having the conical grinding roll in the grinding zone of the pulverizer; and
mounting the second journal assembly to a pivot bracket on which the journal assembly is configured to pivot via two opposed pivot shaft segments.

11 . The method according to claim 10 , wherein:
the opposed pivot shaft segments are spaced from one another and do not extend a length of the pivot bracket.

12 . The method according to claim 10 , wherein:
the flat bull ring segments are configured to register with a grinding surface of the conical grinding roll.

13 . The method according to claim 11 , further comprising the step of:
installing a stop bolt on the cover prior to replacing the cover; wherein the stop bolt is configured to determine a spacing between the conical grinding roll and the flat bull ring segments of the grinding table.

14 . The method according to claim 13 , further comprising the steps of:
removing a journal spring assembly of the pulverizer prior to removing the first journal assembly; and installing the journal spring assembly on the cover after installing the stop bolt and prior to replacing the cover.

15 . The method according to claim 14 , wherein:
the second journal assembly includes a bolted connection between a journal shaft and the pivot bracket.

16 . A vertical spindle pulverizer, comprising:
a housing having a shaft coupled for rotation therein; a grinding table rotatably mounted on the shaft, the grinding table having a plurality of generally flat bull ring segments that have been retrofit onto the grinding table in place of generally toroidal table segments; a journal assembly pivotally mounted on the pulverizer housing; and a generally conical grinding roll coupled to the journal assembly; wherein the journal assembly and grinding roll are retrofit into the pulverizer in place of an existing journal assembly having a generally toroidal grinding roll.

17 . The vertical spindle pulverizer of claim 16 , wherein:
the journal assembly is pivotally mounted on the pulverizer housing via two opposed pivot shaft segments that do not extend a length of a pivot bracket and are accessible from outside of the housing.

Assignees

• General Electric Technology Gmbh

Inventors

• Colson Paul M
• Crafts Douglas W

Classifications

• B02C15/003 Primary

  Shape or construction of discs or rings · CPC title

• B02C15/04

  Mills with pressed pendularly-mounted rollers, e.g. spring pressed · CPC title

• B02C15/004 Primary

  Shape or construction of rollers or balls · CPC title

• B02C15/06 Primary

  Mills with rollers forced against the interior of a rotary ring, e.g. under spring action (B02C15/04 takes precedence) · CPC title