Metso Paper Inc.

Valmet Technologies, Inc.

Johan Bylander

Jörgen T Lundberg

Rickard Andersson

Magnus Henriksson

Fredrik Pontén

Fredrik Ponten

Joergen Lundberg

Magnus Danielsson

Stefan Mattsson

Magnus U Henriksson

Mårten Dahl

Joergen T Lundberg

Apparatus for washing and dewatering pulp and a system for controlling this apparatus are provided. The apparatus includes a pair of rotatable press rolls installed in vats and including a press nip therebetween, an inlet for feeding the pulp to the press nip, with one of the press rolls being movable in relation to the other and in which the processing of the pulp is determined by the number of variable operating parameters. The system includes apparatus for utilizing the distance between the press rolls as a variable operating parameter, for setting a desired value for a specific control parameter, for measuring the specific control parameter, and for adjusting at least two of the variable operating parameters during operation to maintain the difference between the desired value and the measured value of the specific control parameter below a predetermined difference.

System for washing and dewatering pulp

Methods for processing pulp in an apparatus for washing and dewatering pulp and a system for controlling this apparatus are provided. The apparatus includes a pair of rotatable press rolls installed in vats and including a press nip therebetween, an inlet for feeding the pulp to the press nip, with one of the press rolls being movable in relation to the other and in which the processing of the pulp is determined by the number of variable operating parameters. The method includes utilizing the distance between the press rolls as a variable operating parameter, setting a desired value for a specific control parameter, measuring the specific control parameter, and adjusting at least two of the variable operating parameters during operation to maintain the difference between the desired value and the measured value of the specific control parameter below a predetermined difference. Systems for controlling this apparatus are also disclosed.

Apparatus for washing and dewatering pulp, a system for controlling such an apparatus, and a method for processing pulp in such an apparatus

The present invention relates to a washing apparatus for washing of cellulose pulp comprising: a rotatable drum (), a stationary support (), a stationary cylindrical casing (), that encloses the drum, whereby an annular space () is defined between the casing and the drum, a number of seals () that are arranged on the casing and that seals between the casing and the drum, such that the annular space is divided in a formation zone (F), at least one washing zone (T, T), and a discharge zone (U), and at least a reinforcing frame rib (), that is attached to the casing. The reinforcing frame rib () extends around the entire casing () for fixing the casing in a predetermined form, whereby detrimental deformation of the casing (), when washing the paper pulp at overpressure, is prevented.

Arrangement for the treatment of cellulose pulp in a washing apparatus arranged with a reinforcing frame

Apparatus for washing and dewatering pump comprising a pair of rotatable press rolls with permeable outer surfaces, a casing comprising a vat in which the rolls are installed, and a feed for feeding the pulp to the gap formed between the vat and the press roll is disclosed. The vat includes a first side vat segment partially enclosing the first press roll and a second side vat segment partially enclosing the second press roll and casing members for each of the vat segments, the first casing member being pivotable about an axis of rotation and between closed and open positions, pulp distribution devices for distributing pulp onto the press rolls, at least one of the pulp distribution devices being mounted on the casing member whereby it is moved away from the press roll together with the casing member when it is opened.

Apparatus for washing and dewatering pulp

Apparatus for washing and dewatering pulp comprising rotatable press rolls including permeable outer surfaces and a casing comprising a vat in which the rolls are installed are disclosed. A feed for feeding the pulp through the gap between the vat and the outer surfaces of the press rolls is provided and the vat includes a vat segment providing at least one compartment between the vat segment and the casing, the at least one compartment extending along the longitudinal extension of one of the first and second rotatable press rolls and a pressure device to maintain the pressure in the at least one compartment corresponding to the pressure in the gap.

Apparatus for washing and dewatering pulp including a pair of rotatable press rolls with a permeable outer surface in a casing including a vat in which the press rolls are installed is provided. A gap is provided between the vat and the press rolls as well as means for feeding the pulp into the gap between the rolls and the vat includes a first segment partially enclosing the first roll and a second segment partially enclosing the second roll, and casing members for each segment are pivotable about axes of rotation to open and close the casing, and the distance between the axes of rotation is less than the sum of the outer diameter of the two press rolls.

A washer for washing and dewatering cellulose pulp is disclosed, comprising a rotary drum with a plurality of external compartments on the drum defined by axial compartment walls distributed along the circumference of the drum, a stationary cylindrical casing enclosing the drum, defining a ring-shaped space between the casing and the drum, and longitudinal seals in the axial direction of the drum diving the ring-shaped space into a forming zone for forming the pulp, at least one washing zone for washing the pulp at an overpressure, and a discharge zone, and where the longitudinal axial seals are attached to positioning cylinders for adjusting the radial position of the seals, and the longitudinal seal has an articulated connection with the positioning cylinders to make possible oblique positioning of the seal.

Arrangement for the treatment of cellulose pulp involving seal positioning means

A washer for washing and dewatering of cellulose pulp is disclosed, comprising a rotatable drum with a plurality of outer compartments for the pulp to be washed defined by axial compartment walls distributed along the circumference of the drum, a stationary cylindrical casing that encloses the drum, whereby an annular space is defined between the casing and the drum, the annular space divided by means of longitudinal seals in the axial direction of the drum into zones for forming, washing and discharge of the pulp. At least two of the longitudinal seals are arranged such that, when the drum rotates, they meet compartment walls at shifted points in time with respect to each other. Preferably, all of these longitudinal seals are arranged along the circumference of the drum at different positions with respect to respective opposite axial compartment walls.

Arrangement for treatment of cellulose pulp

A washer for washing and dewatering cellulosic pulp is disclosed, comprising a rotary drum with a plurality of external compartments defined by axial compartment walls distributed along the drum's circumference, a stationary cylindrical casing enclosing the drum, whereby a ring-shaped space is defined between the casing and the drum and where longitudinal seals divide the ring-shaped space into a forming zone for forming the pulp, at least one washing zone for washing the pulp at overpressure, and a discharge zone for feeding out the washed pulp, and the filtrates from different washing stages are collected in a peripheral valve located at the drum's end wall, the filtrate stages are separated by seals in the valve, and at least some of the valve seals are displaced in relation to the corresponding longitudinal seal, as seen in the direction of rotation of the drum.

Arrangement for the treatment of cellulose pulp in a washing apparatus arranged with displaced peripheral valve seals

A washing arrangement for washing and dewatering cellulose pulp is disclosed, comprising at least one rotary cylindrical element, against which the pulp is dewatered, and where a seal is located in an end seal holder, so that the seal has a contact surface against the rotary cylindrical element and an application surface placed against an applicator located in a groove in the end seal holder, where the seal has a longitudinal extension, which corresponds to either the entire or at least a greater part of the circumference of the cylindrical element, and is intended to seal against the end of the cylindrical element, and where the seal is a polymer ledge provided with an arming element.

Arrangement for the treatment of cellulose pulp

The present invention relates to a washing apparatus () for washing of cellulose pulp, comprising a rotatable drum (), a stationary support (), a discharge device () that has an outlet orifice (), a casing that surround the drum and that forms a longitudinal discharge opening () and a conveyer worm () arranged below the outlet orifice for reception and removal of washed pulp. The conveyer worm () is movably arranged relatively the support () between a first position (P), in which the conveyer worm receives washed pulp during operation, and a second position (P), in which the outlet orifice () is exposed and access to the drum () via the outlet orifice is possible for carrying out service, maintenance and inspection of the washing apparatus ().

Arrangement for the treatment of cellulose pulp in a washing apparatus adapted to facilitate service and inspection of the apparatus

A washing arrangement for washing and dewatering of cellulose pulp is disclosed, comprising a rotatable drum having a plurality of outer compartments defined by axial compartment walls distributed along the circumference of the drum, a stationary cylindrical casing that encloses the drum, whereby an annular space is defined between the casing and the drum and longitudinal seals extending in the axial direction of the drum divide the annular space into zones for forming, washing and discharge of the pulp. The function of the longitudinal seals is optimized by units for seal adjustment having force sensors for measuring a force acting on one of the longitudinal seals in the direction from the drum, and positioners for automatically moving the longitudinal seal substantially in the radial direction of the drum according to a predetermined pattern based on the measured force.

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Sundsvall, Sweden

Johan Bylander