Rotating throat for coal pulverizer

In a vertical pulverizing mill of the type having a housing, a rotating bowl within the housing and having a substantially horizontal surface for receiving coarse material to be pulverized, crusher means coacting with the bowl surface for pulverizing the material, and a forced air source for directing air upwardly around the periphery of the bowl;

• a vane wheel adapted to be attached to the outer periphery of the bowl to rotate therewith and including an inner ring and a plurality of circumferentially spaced vane plates attached to the inner ring and pitched at an angle to the horizontal, the inner ring having a horizontal and radially inwardly projection flush top flange;
• and
• a plurality of fastener means extending vertically through said flush top flange and into said bowl for securing said vane wheel to said bowl, each of said fastener means terminating flush with the top of said flange;
• wherein the vane wheel is fabricated in part of soft steel, the combination further comprising a plurality of wear-resistant vane plate liners overlying the upper surface of the vane plates, and a plurality of cap plates overlying and secured to the flush vane wheel flange and extending radially outwardly to overlie a portion of each of the vane liners thereby to at least assist in holding the vane liners to the vane plates.

In a vertical pulverizing mill of the type having a housing, a rotating bowl within the housing having a substantially horizontal surface for receiving coarse material to be pulverized, crusher means coacting with the bowl surface for pulverizing the material, inlet means for placing coarse material on the bowl surface, a forced air source for directing air upwardly within the housing around the outer periphery of the bowl surface, and a vane wheel attached to the outer periphery of the bowl to rotate therewith and including a plurality of the bowl to rotate therewith and including a plurality of circumferentially spaced vane plates which are pitched at an angle to the horizontal;

• a deflector assembly attached to the housing peripherally outboard of and spaced from the vane wheel and comprising a lower assembly, a base plate attached to the top of the lower assembly, a plurality of vertical ribs attached to and extending vertically upwardly from the base plate at circumferentially spaced intervals, a plurality of rearwardly opening box-like assemblies of wear-resistant, inwardly-angled plates;
• means for seating said box assemblies on said ribs;
• and
• access means in each of said box assemblies for permitting the box assemblies to be welded to the ribs.

In a vertical pulverizing mill of the type having a housing, a rotating bowl within the housing, and having a receiving surface upon which coarse material to be pulverized may be placed, crusher means coacting with the bowl surface for pulverizing the material, inlet means for placing coarse material on the bowl surface;

• a vane wheel attached to the outer periphery of the bowl to rotate therewith and including the unified combination of an inner ring, an outer ring spaced radially outwardly from and parallel to the inner ring, and a plurality of flat vane plates having parallel upper and lower plane surfaces attached to and between the inner and outer rings in circumferentially spaced relationship to form air flow openings therebetween, said vane plates having upper edges and being pitched at an angle to the horizontal;
• said inner ring terminating at its upper extremity in a flat horizontal flange adapted to be flush mounted to the pulverizer bowl surface, said bowl having a flange receiving recess formed in the outer portion of the upper surface thereof for receiving said inner ring flange;
• a plurality of vane liners having flat primary members adapted to slide into overlying contacting relationship with the upper flat surfaces of the vane plate and a secondary member joined to the primary member and overlying the top edge surface of the vane plate and extending into and affecting the area of the air flow opening;
• each vane liner having a retainer element which extends into contacting relationship with the lower parallel surface of the vane plate;
• and
• a plurality of arcuate cap plates of wear-resistant material attached in a circular pattern to and overlying the flush flange of the vane wheel inner ring and extending into and overlying the air flow openings thereby to partially overlie the secondary plates of the vane liners and to secure the vane liners in position.

In a vertical pulverizing mill of the type having a housing, a rotating bowl within the housing having a substantially horizontal surface for receiving coarse material to be pulverized, crusher means coacting with the bowl surface for pulverizing the material, inlet means for placing coarse material on the bowl surface and a forced air source for directing air upwardly within the housing around the outer periphery of the bowl surface;

• a vane wheel attached to the outer periphery of the bowl to rotate therewith and including a plurality of circumferentially spaced vane plates having essentially parallel upper and lower surfaces which are pitched at an angle to the horizontal, which plates define air flow openings therebetween;
• and
• a plurality of vane liners including the integral combination of an essentially planar primary plate overlying the upper pitched surfaces of the associated vane plate, and a secondary plate which is horizontally disposed within the vane wheel and which overlies the top edge of the vane plate and extends into the air flow opening to affect the effective area thereof;
• each of the vane liners being formed of a wear-resistant material;
• wherein each of the vane liners includes a retainer member extending from the secondary plate parallel to the primary plate and underlying the vane plate when the liner is installed whereby the vane liner slides over and onto the vane plate for installation;
• wherein said apparatus further includes a plurality of arcuate cap plates overlying radially inboard portions of the secondary plates, the cap plates overlying and being secured to the vane wheel to hole the vane liners in place.