A turret includes a generally frusto-conical shaped body and a plurality of static straightening vanes arranged interior to the body, the vanes dividing the body into a plurality of substantially equal sections. The vanes are configured to straighten a swirling flow of solid particles as they enter the body, and to divide the swirling flow into a plurality of straightened flows that are communicated to a plurality of coal outlet pipes.

A turret includes a generally frusto-conical shaped body and a plurality of static straightening vanes arranged interior to the body, the vanes dividing the body into a plurality of substantially equal sections. The vanes are configured to straighten a swirling flow of solid particles as they enter the body, and to divide the swirling flow into a plurality of straightened flows that are communicated to a plurality of coal outlet pipes.

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.

A grinding roller for vertical axis crushers is disclosed herein that is produced by foundry casting of a metal matrix. The roller includes a plurality of reinforcing inserts on its periphery, wherein some portions of the peripheral surface of a same insert are located at a distance d1 or d2 from the work surface depending on wear stresses. Accordingly, the roller has at least one zone experiencing high wear stress Z1, with at least one portion of the insert positioned at a distance d1 near the work surface of said roller; and a zone with low wear stress Z2, with a portion of the insert positioned at a distance d2 that is set back relative to the work surface of the roller. In some examples, distance d1 is less than distance d2.

Provided is a roller mill that is provided with: a rotary table; a raw coal adding tube that supplies solid fuel to the rotary table; and a roller that rotates about a rotating shaft by being pressed against a grinding surface of the rotary table and grinds solid fuel along with rotation of the rotary table. In such a roller mill, a position where an outer peripheral surface of the roller and the grinding surface of the rotary table come into contact with each other and a circumferential velocity of the outer peripheral surface equals a circumferential velocity of the grinding surface is located further to an inner circumferential side of the rotary table than a position where the outer peripheral surface and the grinding surface come into contact with each other at a center position in a width direction of the roller.

The invention relates to a grinding roller device for a roller mill having a sleeve-like mount for securing the spindle of the grinding roller, wherein the grinding roller is rotatively mounted in axial direction in a stationary way at the end region of the spindle, and wherein the sleeve-like mount features at least one clamping means in order to secure the spindle in the mount against rotation and axial movement. The invention is characterized in that the sleeve-like mount features an inner eccentric sleeve to provide for adjustability of the spindle of the grinding roller, and in that the eccentric sleeve is arranged in the sleeve-like mount to provide at least rotary adjustment of the spindle, and/or in that the eccentric sleeve is displaceably accommodated in the sleeve-like mount to provide axial displacement in axial direction of the spindle of the grinding roller.

A method for drive control of a vertical mill having a grinding plate rotatable about the vertical axis by a drive train composed of an electric motor and a gearbox is disclosed. At least the electric motor and the grinding plate represent inertia elements in a system that can oscillate and are connected by the gearbox operating as a torsion spring element. A variation in the rotation speed of at least one of the inertia elements is measured, and the electric motor is governed by a controller that minimizes the measured variation in the rotation speed. The controller is parameterized for governing the electric motor so as to minimize maximum reaction torques resulting in the gearbox when applying a sinusoidal excitation.

A planet carrier arrangement includes a bearing assembly having first and second roller bearings and a traction element having a first end supported by the bearing assembly such as to enable the traction element to oscillate. A planet carrier is mounted in a suspended manner to the traction element, wherein one of the roller bearings of the bearing assembly is configured to absorb an axial force seeking to lift the planet carrier.

A method embodiment involves preparing single metal or mixed transition metal chalcogenide using exfoliation of two or more different bulk transition metal dichalcogenides in a manner to form an intermediate hetero-layered transition metal chalcogenide structure, which can be treated to provide a single-phase transition metal chalcogenide.

A turret includes a generally frusto-conical shaped body and a plurality of static straightening vanes arranged interior to the body, the vanes dividing the body into a plurality of substantially equal sections. The vanes are configured to straighten a swirling flow of solid particles as they enter the body, and to divide the swirling flow into a plurality of straightened flows that are communicated to a plurality of coal outlet pipes.