Abstract: A rotary drum filter includes a drum shell configured to rotate through a slurry, the drum shell having areas defining a plurality of drainage holes, at least one divider plate a first end and a second end, the at least one divider plate disposed on an outer surface of the drum shell and extending longitudinally and laterally along the drum shell, the first end being disposed near a drainage hole, and a filter medium disposed on one or more grids that are disposed on the outer surface of the drum shell above the at least one divider plate. The at least one divider plate is configured to direct filtrate on the outer surface of the drum shell filtered through the filter medium into the drainage hole.

Abstract: A rotary drum filter comprising one or more divider plates disposed between the drum's outer surface and grids disposed radially outward from the drum's outer surface. The divider plates are desirably diagonally disposed along the drum's outer surface and have at least one end disposed near a drainage hole. The divider plates and open sections under the grids between circumferentially adjacent grids permits filtrate to flow under the grids. The divider plates and open sections under the grids permit the filtrate to flow into the nearest drainage hole while increasing the run underneath the grids, thereby permitting more filtrate to exit through a limited number of drainage holes.

Abstract: A flash tank including: a closed interior chamber; a gas exhaust port coupled to an upper portion of the chamber; a liquid discharge port coupled to a lower portion of the chamber; an inlet nozzle attached to an inlet port of the chamber, wherein the inlet nozzle includes a flow passage, and a movable valve plate in the flow passage, wherein the valve plate has a first position which defines a first throat in the flow passage and a second position which defines a second throat having a smaller cross-sectional area than the first throat.

Abstract: A flash tank including: a closed interior chamber; a gas exhaust port coupled to an upper portion of the chamber; a liquid discharge port coupled to a lower portion of the chamber; an inlet nozzle attached to an inlet port of the chamber, wherein the inlet nozzle includes a flow passage, and a movable valve plate in the flow passage, wherein the valve plate has a first position which defines a first throat in the flow passage and a second position which defines a second throat having a smaller cross-sectional area than the first throat.

Abstract: A flash tank including: a closed interior chamber; a gas exhaust port coupled to an upper portion of the chamber; a liquid discharge port coupled to a lower portion of the chamber; an inlet nozzle attached to an inlet port of the chamber, wherein the inlet nozzle includes a flow passage, and a movable valve plate in the flow passage, wherein the valve plate has a first position which defines a first throat in the flow passage and a second position which defines a second throat having a smaller cross-sectional area than the first throat.

Abstract: A shower pipe assembly to provide a wash liquid for washing a pulp mat, comprising: a shower pipe with areas defining oblong orifice openings extending through the wall; and a combination plate paddle configured to be removed and configured to be adjusted along the wall, wherein the combination plate paddle comprises a plate and a paddle, wherein the plate has areas defining a plate opening as adjacent to and configured to communicate with at least one oblong orifice opening of the shower pipe in an open position, wherein the opening formed by the oblong orifice opening in the pipe and the plate can be adjusted by moving the combination plate paddle along the wall of the pipe, and the combination plate paddle is slideably engaged to the shower pipe by fasteners.

Abstract: A method for using a washer press for washing and dewatering a wide range of solids concentrations of pulp in liquid suspensions includes multiple distinct displacement wash zones about a drum with multiple nips.

Abstract: A method for using a washer press for washing and dewatering a wide range of solids concentrations of pulp in liquid suspensions includes multiple distinct displacement wash zones about a drum with multiple nips.

Abstract: A washer press apparatus for washing and dewatering a wide range of solids concentrations of pulp in liquid suspensions includes multiple distinct displacement wash zones about a drum with multiple nips.

Abstract: A scrubber removes matter (e.g., particulate, gaseous, or liquid) from a gas stream in order to recover the matter and/or to clean the gas. In particular aspects, the scrubber contains multiple venturis that may provide additional flexibility and increased efficiency. The invention also pertains to related methods.

Abstract: A scrubber removes matter (e.g., particulate, gaseous, or liquid) from a gas stream in order to recover the matter and/or to clean the gas. In particular aspects, the scrubber contains multiple venturis that may provide additional flexibility and increased efficiency. The invention also pertains to related methods.

Abstract: A vacuum drum washer including: a cylindrical drum including a screen and deck defining an exterior cylindrical surface; a plurality of outer filtrate channels disposed inward of the screen, the outer filtrate channels extending along a longitudinal axis of the drum and substantially an entire length of the drum; an radial array of filtrate end conduits extending radially inward from the outer filtrate channels towards a rotational axis of the drum, the radial filtrate conduits have an inlet positioned at a first end of the drum and draining filtrate from the outer filtrate channels; a filtrate chamber at the first end of the drum and receiving filtrate discharged from the end conduits, and an array of radial filtrate drainage conduits coupled to receive filtrate from the filtrate channels, the drainage conduits each having an inlet proximate to the filtrate channels, the inlets are arranged between a center of the drum and a second end of the drum, and the radial drainage conduits directing filtrate to the f

Abstract: A method to assemble a nozzle-fastener assembly including: inserting a hollow stem through a wash liquid direction device; inserting the hollow stem through a mounting block; positioning an inside surface of the mounting block against a curved surface of a wash liquid distribution pipe and an outside surface of the block against the wash liquid direction device; attaching the nozzle-fastener to an aperture in the pipe such that an inlet to the hollow stem is in fluid communication with a wash liquid passage in the pipe, wherein the stem extends through the mounting block and the wash liquid direction device, and the stem includes a outlet for the wash liquid passing through the hollow stem and to the wash liquid direction device, and wherein the wash liquid direction device and mounting block are held together by the attachment of the nozzle-fastener to the aperture in the wash liquid pipe.

Abstract: A method of treating pulp on a porous surface of a rotating drum cylinder having a lower drum portion in a vat of pulp slurry and a radial array of filtrate conduits including: as the porous surface of the drum rotates through the vat, drawing filtrate from the slurry through the porous surface by the application of a suction to the filtrate conduits vacuum; draining the filtrate from the filtrate conduits into the filtrate chamber and to a filtrate suction conduit extending to an elevation below the vat; forming a pulp mat on the porous surface which passes filtrate and substantially blocks fibers in the pulp slurry; removing the pulp mat on the porous surface from the vat as the drum rotates; draining filtrate from the filtrate suction conduit, and before excessive gases passing through the porous surface enter the filtrate conduits, switching a fluid flow downstream of the filtrate conduits to a gas vent passage offset and below from a drum rotational axis.

Abstract: A method of treating pulp on a porous surface of a rotating drum cylinder having a lower drum portion in a vat of pulp slurry and a radial array of filtrate conduits including: as the porous surface of the drum rotates through the vat, drawing filtrate from the slurry through the porous surface by the application of a suction to the filtrate conduits vacuum; draining the filtrate from the filtrate conduits into the filtrate chamber and to a filtrate suction conduit extending to an elevation below the vat; forming a pulp mat on the porous surface which passes filtrate and substantially blocks fibers in the pulp slurry; removing the pulp mat on the porous surface from the vat as the drum rotates; draining filtrate from the filtrate suction conduit, and before excessive gases passing through the porous surface enter the filtrate conduits, switching a fluid flow downstream of the filtrate conduits to a gas vent passage offset and below from a drum rotational axis.

Abstract: In a rotary drum for condensing pulp from a pulp slurry vat, the drum including radial conduits delivering filtrate from a pulp mat on an outer surface of the drum to at least one filtrate conduit coaxial with a drum rotational axis, a valve segment in the filtrate conduit including: an outer surface juxtaposed against drainage outlets of the radial conduits as the conduits pass through an angular range extending from an upper drum position to an immersed in a vat position, wherein the valve segment does not block the drainage outlets during a majority of the rotation of the drum; at least one inlet aperture on the outer surface aligned with the drainage outlets, said inlet aperture extending at least a majority of a width of the valve segment, and a closed passage extending from the inlet aperture to a gas vent external to the filtrate conduit, wherein the closed passage is offset from and below a centerline of the filtrate conduit.

Abstract: A method to assemble a nozzle-fastener assembly including: inserting a hollow stem through a wash liquid direction device; inserting the hollow stem through a mounting block; positioning an inside surface of the mounting block against a curved surface of a wash liquid distribution pipe and an outside surface of the block against the wash liquid direction device; attaching the nozzle-fastener to an aperture in the pipe such that an inlet to the hollow stem is in fluid communication with a wash liquid passage in the pipe, wherein the stem extends through the mounting block and the wash liquid direction device, and the stem includes a outlet for the wash liquid passing through the hollow stem and to the wash liquid direction device, and wherein the wash liquid direction device and mounting block are held together by the attachment of the nozzle-fastener to the aperture in the wash liquid pipe.

Abstract: A nozzle assembly for spraying a wash liquid towards a pulp mat, the assembly including an integral fastener-nozzle having a conduit for the wash liquid, an outlet to the conduit for discharging the wash liquid and an attachment to secure the fastener-nozzle to an aperture in a wash liquid pipe, and a wash liquid direction device extending outwardly from the pipe and adapted to direct the wash liquid from the outlet towards the pulp mat.

Abstract: A rotary drum filter has a plurality of longitudinally extending division grids mounted about the outer circumference of a drum. A plurality of corrugated sheets are provided, with the leading and trailing edges of each sheet mounted to circumferentially adjacent pairs of division grids to define filtrate compartments. An equivalent number of perforated filter plates are also provided. Each filter plate is attached to the top of a corrugated sheet and has a leading edge and a trailing edge that are set back from the leading edge and trailing edge of the corrugated sheet. A seal clip is positioned near the leading edge of each corrugated sheet. A seal member or seal members is/are held in place by the seal clip and is/are positioned at the face of the leading edge of each corrugated sheet or beneath and near the face or each corrugated sheet.

Abstract: A vacuum drum washer is designed to enable the use of an end-draining drum for drum lengths exceeding 20 feet. The drum washer includes a cylindrical drum having a mesh screen defining an exterior wall. A plurality of outer filtrate channels are disposed radially inward from the mesh screen. A plurality of inner filtrate channels are disposed radially inward from the outer filtrate channels and extend along generally less than an entire length of the drum. A transfer channel connects the outer filtrate channels and the inner filtrate channels. A plurality of radial drainage chutes are disposed adjacent a head end of the outer and inner filtrate channels, which direct the filtrate to a drain valve.