System, method and apparatus for upgrading a pulverizer
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.
1. 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 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.
2. The method according to claim 1 , 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.
3. The method according to claim 2 , wherein: the opposed pivot shaft segments are spaced from one another and do not extend a length of the pivot bracket.
4. The method according to claim 3 , 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 flat bull ring segments of the grinding table.
5. The method according to claim 4 , 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.
6. The method according to claim 5 , wherein: the second journal assembly includes a bolted connection between a journal shaft and the pivot bracket.
7. The method according to claim 2 , wherein: flat bull ring segments are configured to register with a grinding surface of the conical grinding roll.
8. 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.
9. The method according to claim 8 , 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.
10. The method according to claim 9 , further comprising the step of:
removing a journal spring assembly of the pulverizer prior to removing the first journal assembly.
11. The method according to claim 10 , further comprising the step of:
installing the journal spring assembly on the cover after installing the stop bolt and prior to replacing the cover.
12. The method according to claim 8 , 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.
13. The method according to claim 12 , wherein: the opposed pivot shaft segments are spaced from one another and do not extend a length of the pivot bracket.
14. The method according to claim 8 , wherein: the second journal assembly includes a bolted connection between a journal shaft and pivot bracket of the journal assembly.
15. The method according to claim 8 , further comprising the step of: adjusting a rotational speed of the grinding table in dependence upon the geometry of the conical grinding roll.