A planetary roller mill for processing a feed material includes a vessel with a grinding ring having an opening therethrough and a first area. The grinding ring is in sealing engagement with the inside surface of the vessel assembly. At least two non-circular support plates are secured to a rotatable shaft. Each plate has an axially facing surface. A plurality of rollers rotatably are mounted to and positioned between the two support plates. Each of the plurality of rollers are in grinding communication with the grinding surface. The planetary roller mill includes an air supply system having an outlet in communication with the opening in the grinding ring. Areas of the two support plates are of magnitudes which configure a flow area through the opening of at least 30 percent of the first area to provide a predetermined quantity of heated air to remove moisture from the feed material in the grinding assembly.

A system for servicing a pulverizer includes a pulverizer having a housing, a journal assembly pivotally connected to the housing, a grinding mechanism operatively connected to the journal assembly, and an opening within the housing adjacent to the journal assembly and providing an access point to an interior of the housing, and a hoist apparatus mounted to the housing. The hoist apparatus includes a frame assembly received about the opening in the housing, a sheave assembly including a plurality of sheaves supported by the frame assembly, a motor operatively connected to one of the plurality of sheaves, and a cable received by the sheave assembly. The motor is operable to at least one of retract the cable through the sheave assembly to rotate a component out of the pulverizer through the opening and controllably let out the cable to rotate the component into the pulverizer through the opening.

A system for servicing a pulverizer includes a pulverizer having a housing, a journal assembly pivotally connected to the housing, a grinding mechanism operatively connected to the journal assembly, and an opening within the housing adjacent to the journal assembly and providing an access point to an interior of the housing, and a hoist apparatus mounted to the housing. The hoist apparatus includes a frame assembly received about the opening in the housing, a sheave assembly including a plurality of sheaves supported by the frame assembly, a motor operatively connected to one of the plurality of sheaves, and a cable received by the sheave assembly. The motor is operable to at least one of retract the cable through the sheave assembly to rotate a component out of the pulverizer through the opening and controllably let out the cable to rotate the component into the pulverizer through the opening.

A system for servicing a pulverizer includes a pulverizer having a housing, a journal assembly pivotally connected to the housing, a grinding mechanism operatively connected to the journal assembly, and an opening within the housing adjacent to the journal assembly and providing an access point to an interior of the housing, and a hoist apparatus mounted to the housing. The hoist apparatus includes a frame assembly received about the opening in the housing, a sheave assembly including a plurality of sheaves supported by the frame assembly, a motor operatively connected to one of the plurality of sheaves, and a cable received by the sheave assembly. The motor is operable to at least one of retract the cable through the sheave assembly to rotate a component out of the pulverizer through the opening and controllably let out the cable to rotate the component into the pulverizer through the opening.

A vertical roller mill with segmented bull ring and clamping system includes a roller mill base having an internal taper configured for holding a bull ring in grinding position, a cowring dimensioned to be fitted into the internal taper of the base and a clamp ring secured atop the cowring. Each of these has a plurality of apertures spaced and configured so that when fastened together with fasteners, they form a radial landing platform for a plurality of segmented bull ring bricks. The system also includes a plurality of segmented bull ring bricks which, when clamped to the radial landing platform and taken as a whole, form a solid, but readily separable, segmented bull ring suitable for use in a roller mill. The system further includes wedge blocks and fasteners for individually removably clamping the segmented bull ring bricks to the radial landing platform.

A vertical roller mill with segmented bull ring and clamping system includes a roller mill base having an internal taper configured for holding a bull ring in grinding position, a cowring dimensioned to be fitted into the internal taper of the base and a clamp ring secured atop the cowring. Each of these has a plurality of apertures spaced and configured so that when fastened together with fasteners, they form a radial landing platform for a plurality of segmented bull ring bricks. The system also includes a plurality of segmented bull ring bricks which, when clamped to the radial landing platform and taken as a whole, form a solid, but readily separable, segmented bull ring suitable for use in a roller mill. The system further includes wedge blocks and fasteners for individually removably clamping the segmented bull ring bricks to the radial landing platform.

In a method and a corresponding device for controlling a rotational speed of a drive driving a shaft, the rotational speed is controlled by a control device which is supplied with a control deviation calculated based on a desired value and an actual value for the rotational speed. The actual value for the rotational speed of the shaft is measured on the shaft with a first sensor and at least one additional sensor and the actual value is calculated from a weighted average of the individual measured values for the rotational speed obtained from the first and the at least one additional sensor.

A roller mill system includes a vessel having an inlet, an outlet, a grinding zone and a classifier zone. The grinding zone includes a grinding assembly configured for grinding the material into fine particles. The grinding zone also includes a rejects capture and discharge system that includes one or more discharge conduits for conveying rejects away from the vessel. The rejects capture and discharge system includes: 1) a collection trough located under the grinding assembly and in communication with one of the discharge conduits, for discharging rejects from the grinding zone; and/or 2) a turbine classifier mounted in the classifier zone. The turbine classifier is rotatable about a central axis. Another outlet is formed in a side wall of the classifier zone. The turbine classifier is configured to expel the rejects radially outward therefrom, through the side wall outlet and into another one of the discharge conduits.

A mill, in particular a pendulum mill or roller mill, having a classifier, wherein the mill has a mill housing with an interior in which there is situated a milling space B1 in which a milling device having at least one milling tool is arranged. The classifier is arranged above the milling device in a classifying space B3. At least one drop device is provided which connects the classifying space B3 to the milling space B1. Arranged below the classifier is at least one distribution plate which has at least one drop opening on which the at least one drop device is arranged.

A mill, in particular a pendulum mill or roller mill, having a classifier, wherein the mill has a mill housing with an interior in which there is situated a milling space B1 in which a milling device having at least one milling tool is arranged. The classifier is arranged above the milling device in a classifying space B3. At least one drop device is provided which connects the classifying space B3 to the milling space B1. Arranged below the classifier is at least one distribution plate which has at least one drop opening on which the at least one drop device is arranged.