Abstract: 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.

Abstract: A material cutting shaft assembly in which a rotary shaft of hexagonal shape in cross section carries an array of material cutting discs between its opposite ends, seat means adjacent the shaft ends, and disc retainer means adjustable and removably mounted in the seat means to hold the array of cutting discs in operative positions to avoid axially directed load stress conditions.

Abstract: Material shredding apparatus having a motor driven shaft carrying a material shredding rotor operatively mounted in a housing assembly adjacent a pivotally yieldable material shredding cutter and a shredded material sizing screen pivotally movable between a position in abutment with the pivotally yieldable shredding cutter and a shredder material receiving position adjacent the shredding rotor. The assembly being provided with electrical safety cutoff circuit means operative upon loss of shear pin support means for the material sizing screen and shredding cutter for stopping current supply to the motor driven shaft to avoid damage to the housing assembly by encountering tramp material to hard to shred by the shredding cutter.

Abstract: Material shredding apparatus for reducing scrap vehicle tires to produce two sub-products of rubber and of rubber free steel wire in which the apparatus has a shaft driven set of blocks in which each block has cutting teeth in circumferentially spaced relation, the respective blocks are keyed to the shaft so the cutting teeth on the blocks are circumferentially distributed along the shaft at 15.degree. spacing to assure that the cutting teeth perform a cutting function one at a time to avoid excessive power consumption and the material being shredded is distributed along the set of blocks on the shaft to reduce local areas of wear.

Abstract: Material reducing apparatus having a drive arrangement for a pair of shafts carrying double edge cutter discs, motor driven transmissions for each shaft having different speed characteristics for reducing motor speeds to double digit speeds, bearings mounted in pillow blocks so that the pillow blocks can be opened to allow removal of the bearings so the shafts carrying the double edge cutters can be repositioned to present the cutters selectively to reduce material with either edge of the double edge cutters. The drive arrangement is also duplicated at the opposite ends of the pair of shafts for selective connection to drive the shafts either by one of the drive arrangements or by the duplicate drive arrangement.

Abstract: Apparatus for reducing material in which a rotor is formed with a plurality of material impact hammers and fan elements mounted on the rotor for simultaneously reduced material upon impact and moving the reduced material through the rotor, and a housing encloses the rotor between a material inlet and a reduced material outlet with the fan elements preventing reduced material bypassing the outlet to return to the inlet.

Abstract: A system for disposing of sludge by using the sludge as a primary source of fuel for its disposition by combustion thereof in which a mass of liquified sludge is processed to reduce the solids to a predetermined size for use as the fuel and concurrently separating a substantial portion of the contained liquid, delivering the processed solids and liquids to a combustor for converting the solids to ash and converting the liquids to vapor, introducing ambient air to the combustor to support combustion of the solids while employing a portion of the ambient air to the combustor for removing the vapor at a temperature below the temperature at which the solids are reduced to ash, utilizing a portion of the vapor removed from the combustor to initiate vaporization of the liquid in the mass of liquified sludge being processed initially, using a part of the removed vapor to enter into a heat exchange relationship with the ambient air prior to its being admitted to the combustor, and releasing excess vapor to the ambien

Abstract: The apparatus operates to supply the air requirements for grinding a fuel material to the mill to guarantee the correct particle size and to decouple from the air emitted from the grinding apparatus a certain proportion so the combustion of the ground fuel material will be conducted at a ratio of less than the usual 3 to 1 ratio of air-to-fuel so the combustion can be controlled to reduce the nitrous oxide emission, the air that is decoupled is returned to the grinding apparatus with a supply of make up air that is heated for purposes of drying the material in the grinding apparatus.

Abstract: A rotary disc screen apparatus consisting of a material screening frame having a series of corotating parallel shafts in spaced relation, screen discs mounted on supports on the shafts so the screen discs interleave between adjacent shafts, the screen discs being detachable from the supports for interchangeability with other screen discs of a selected different dimension, and drive assemblies connected to alternate one of the shafts for being able to apply the drive assemblies on adjacent jammed shafts when needed.

Abstract: Waste material classifying apparatus for applying forced air streams to the waste material discharged off the end of a rotary disc screen conveyor, directing the forced air streams into an enclosure at the discharge end of the conveyor, and forming separate passages in the enclosure so that the waste material fractions are classified by the response of the fractions to the forced air or lack of response to forced air streams, whereby the forced air streams tumble and flip the waste material for augmenting the separation of the fractions.

Abstract: A downdraft reversible hammer mill having a casing structure for rotatably supporting a hammer assembly between a top inlet and a bottom outlet, breaker plates pivoted near the top inlet and extending down on opposite sides of the circular path of the hammer assembly, grate bars circumscribing the hammer assembly and having opposite end grate bars extending into cooperative relation with the bottom ends of the breaker plates, such that by controlling the positions of the breaker plates relative to both the circular path of the hammer assembly and the end grate bars, with one breaker plate moved in adjacent the circular path and the opposite breaker plate moved back from the circular path to open the cooperating end grate bar, the mill is caused to operate with a negative pressure at the inlet and a positive pressure at the outlet to establish a downdraft effect in the mill casing structure in either direction of hammer assembly of rotation upon properly positioning one breaker plate moved in and the opposite

Abstract: Apparatus for processing waste material made up of a mass of comingled abrasive shards and the like, uncrushable and shreddable classes of waste so that the subsequent individual handling of that waste material is made more efficient. The apparatus combines in a common structure rotary disc screen for initially separating the waste material so that the shards and abrasive classes of material are able to drop through the rotary disc screen while the remainder of the material is delivered to the apparatus for gravitational classification as between the uncrushables and shreddables in response to air flow in a controlled atmosphere to promote gravity fall-out separation of the heavier components from the lighter components.

Abstract: A fluff producing mill for converting a pulp material into an absorbent fluff product by the operation of a hammer rotor having multiple overlapping hammer clusters which describe a hammer tip circle, and a pulp material feeder positioned to present the pulp material radially into the hammer rotor between a breaker bar and a cooperating guide plate, the feeder supporting the breaker bar so it can be adjusted toward and away from the hammer tip circle to accommodate hammer clearance at the breaker bar.

Abstract: A rotary shredding apparatus having in combination counterrotating cutter supporting shafts operated by a reversible fluid pressure driven motor, and a fluid flow circuit connected to the reversible motor and including a pump supplied source of fluid at a predetermined nominal operating flow rate, a fluid pressure responsive relief valve operative for fluid flow exceeding said predetermined nominal operating flow rate to return fluid to the source, and a fluid flow directing valve connected in fluid flow relation between said relief valve and said fluid driven motor, and control connected to said fluid flow directing valve means; a fluid flow rate detecting sensor disposed in said hydraulic fluid flow circuit between said fluid flow directing valve and said pressure responsive relief valve, whereby upon the fluid flow rate detecting sensing fluid flow reduction at from about 5% to 10% of said predetermined nominal operating flow rate in said fluid flow circuit said fluid flow detecting sensor energizes said c

Abstract: A rotary disc screen composed of a bed of rotary discs in spaced relation and formed in the periphery with undulating surfaces for constantly agitating the waste material to be screened, and having a controllable drive system for the rotary discs subject to control sensor which is sensitive to the distribution of the waste material along the length of the rotary screen for adjusting the speed of the discs making up the rotary screen to control the residence time of waste material and maximizing the screening efficiency so that certain classes of components in the waste material are given an opportunity to fall through the spaces between the discs for collection and transport to a separate area from the remainder of the waste material that is moved through the full length of the rotary disc screen.

Abstract: Apparatus for simultaneously grinding coal and dolomite to a size suitable for fluid bed combustors in which the grinding mill is modified to allow for the formation in the mill of a bed of the mixed coal and dolomite which reduces the tendency of dolomite to fracture and produce excess of fine particles thereby optimizing the grinding conditions for both coal and dolomite, and a method of reducing coal and dolomite simultaneously in a common mill and in predetermined proportions for optimum reduction of each material.

Abstract: A fluidized bed combustion apparatus in which the combustion chamber has a dense fuel bed created in the chamber, and a grinding mill connected to the dense fuel bed portion of the chamber and so operated as to classify the material into fine and coarse particulates with the fines being directed into the bottom of the dense fuel bed and the coarse particulates being directed to the top of the dense fuel bed. The apparatus is placed under the control of a controller which regulates the mill to feed fines and coarse particulates in proportions for maintaining optimum average particle size and hence optimize boiler efficiency.

Abstract: Apparatus for and method of reducing spherically shaped fluid coke waste by-product pellets into a pulverized condition for use as a fuel in which there is a first grinding and pulverizing mill initially receiving the waste material which, because of its spherical shape is difficult to pulverize, and accordingly the waste material is transported to a second grinding mill where its spherical shape is altered to render it more easily pulverizable upon return to the first grinding mill where the final pulverizing of the waste material takes place prior to discharge to a point of use which may be to directly fire a furnace, a boiler or a kiln. The waste material is usually rather wet and requires drying so as not to choke the grinding apparatus, and for this purpose heat generated during the burning of the pulverized waste material is returned to the apparatus for the purpose of drying the waste material during its processing in the respective mills.

Abstract: Roller mill control system for a centrifugally swung roller grinding mill to grind fuel in quantity to exactly match a burner fuel demand, driving the roller mill at a speed which varies as the fourth power of the percentage of burner demand for fuel so as to substantially match the mill grinding capability with variations in the percentage of the burner fuel demand, supplying air through the grinding mill for transporting the ground fuel to the burner at a substantially constant ratio of air to fuel from a minimum air velocity which maintains the ground fuel moving in the air stream, and monitoring the pressure differential across the roller mill between its air supply and outlet for detecting abnormal changes in the differential pressure as a safety net.

Abstract: A process for disposal of wet sewage sludge by introducing a particulate material having BTU values, feeding the mixture to a grinding or milling apparatus in which the particulate material acts to prevent the sewage sludge caking in the apparatus during the reduction in the grinding or milling thereof, supplying hot gaseous medium to dry the mixture, with a portion of the hot mixture being recirculated to assist in the drying of the mixture as it is fed into the grinding or milling apparatus, and disposing of the resulting ground or milled mixture by burning with the aid of the BTU content of the particulate material.