Kamyr Ab

Kvaerner Pulping Technologies Aktiebolag

Kvaerner Pulping Ab

Kamyr Aktiebolag

Ronny Hoglund

Ulf Jansson

Rolf Ekholm

Bengt H Nilsson

Johan E Gullichsen

Bo Clarstrom

Lennart Bergkvist

Lars Jacobsson

Jan Anderson

Sten Gustafsson

Kjell Lindblom

Screening device for screening a suspension

Drum supported by support rollers for washing fibre material

Pump impeller

The invention relates to a pump for pumping fibrous pulp suspension and separating gas from the suspension, comprising a pump casing with a pump casing chamber (4) with an axial inlet (17) and a radial outlet (6) for the suspension and also a gas outlet (19); in the pump chamber part a pump wheel (3) with a hub (27), on the hub front pump vanes (30) in a front pump chamber part (4A) facing the inlet, rear pump vanes (32) in a rear pump chamber part (4B) and an annular partition (28) between the front and rear pump chamber parts, which partition is joined to the hub; and a drive shaft (10) for the pump wheel which extends through one end wall (7) of the pump casing, and also bearing members (13, 14, 15) for the drive shaft. What is characteristic of the invention is that the hub has an outer portion (36) which extends mainly radially outwards in the rear pump chamber part, that the annular partition is arranged a little in front of the outer hub portion, that the inner diameter of the partition is smaller than the outer diameter of the outer hub portion so that the radial extents of the partition and the outer hub portion at least partly overlap one another in the radial direction, and that channels (50) extend with a portion mainly radially between the rear side (42) of the partition (28) and the front side (37) of the outer hub portion (36) from the inner part of the front pump chamber part (4A) towards the outer part of the rear pump chamber part (4B).

Pump for pumping fibrous pulp suspension

A screen dram for the dewatering and/or washing of cellulose pulp, comprises a first cylinder (2) made from non-stainless material, which is rotatable about its axis (5); a cylindrical screen plate (6) arranged coaxially on the outside of the first cylinder, but at a distance from it, and between the screen plate and the first cylinder an annular chamber (7) which can receive liquid which has passed through the screen plate, which chamber contains passages (26) which extend in the axial direction towards one or both ends of the drum for the withdrawal of the screen liquid. The chamber (7) is lined with stainless steel (8) in the form of one or more cylindrical plate sections (8a, 8b . . . 8n). These, by virtue of shrink joints, can be joined to and bear in seal-tight arrangement against the cylindrical casing of the first cylinder. Preferably, the stainless steel contains at least 5% molybdenum.

Rotating screen drum with a stainless lining

Suspension pump with built-in variably eccentric liquid ring pump

An apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material is described which comprises a housing, a fluidizing rotor and an impeller of radial type, said housing having a cylindrical portion for the rotor, a portion for the impeller which is radially enlarged in relation to the cylindrical portion, a wall closing one end of the housing and a shaft rigidly connected to the impeller, an axial inlet for suspension being disposed at the cylindrical portion, and a radial outlet for suspension at the radially enlarged portion. The apparatus has also a degassing system for removing gas which collects in front of the impeller and comprising an opening in the impeller and the wall, the impeller having a hub, a partition and forward and rear blades. Furthermore, the impeller is provided with a concentric, circular inlet for the continuous supply of suspension to the rear blade space, the rear blades being arranged to exert a pump action on the suspension supplied to the apparatus.

Apparatus for fluidizing, degassing and pumping a suspension of fibrous

An apparatus for separating undesired particles from a suspension flow of pulp and for dividing the suspension flow into fractions is described. The apparatus comprises a housing having a first chamber with an inlet for the suspension flow and a first outlet for the undesired particles, a second chamber with a second outlet and communicating with the first chamber through a first annular gap, and a third chamber with a third outlet and communicating with the second chamber through a second annular gap, the radial extension of the second gap being less than that of the first gap. First and second rotating discs are carried by a shaft for common rotation therewith. The first disc is disposed in the first chamber in front of the first gap to separate the undesired particles by means of teeth protruding from the first disc. The second disc is disposed in the second chamber in front of the second gap to remove, by means of teeth protruding from the second disc, particles in form of twigs, undissolved fiber bundles and any remaining undesired particles from the suspension flow in front of the second gap. The discs have cavities axially aligned with the first and second gaps, respectively, to form axial passages, said second disc and said second gap cooperating to divide the suspension flow into a coarse fraction which is removed through the second outlet and a finer fraction which passes through said second annular gap and is removed through the third outlet.

Apparatus for separating particles from a pulp flow and dividing the

An apparatus for screening a suspension of fibrous cellulose material containing undigested wood comprising a shaft rotating in a housing and an elongate screen disposed in a screening chamber. This screen comprises a stationary screening member and a rotating screening member connected to the shaft. Each of the screening members comprises a plurality of parallel rings disposed with predetermined axial distance from each other to form circumferential openings, the rings of the stationary screening member and the rotating screening member being arranged to partially close each other's openings between the rings to define circumferential screening gaps therebetween. According to the invention the stationary screening member is in the form of a unitary body rigidly connected to the housing so that at least circumferential movement is prevented. The rotating screening member is likewise in the form of a unitary body but it is connected to the shaft for common rotation therewith. The apparatus enables digested pulp to be screened without dilution.

Apparatus for screening a suspension of fibrous cellulose material

An apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material is described which comprises a housing, a fluidizing rotor and an impeller of radial type, said housing having a cylindrical portion for the rotor, a portion for the impeller which is radially enlarged in relation to the cylindrical portion, a wall means closing one end of the housing and a shaft rigidly connected to the impeller, an axial inlet for suspension being disposed at the cylindrical portion, and a radial outlet for suspension at the radially enlarged portion. The apparatus has also a degassing system for removing gas which collects in front of the impeller and comprising opening means in the impeller and said wall means, said impeller having a hub, a partition and forward and rear blades. Furthermore, the impeller is provided with a concentric, circular inlet for the continuous supply of suspension to the rear blade space, the rear blades being arranged to exert a pump action on the suspension supplied to the apparatus.

In an apparatus for dividing a suspension of fibrous cellulose pulp into a plurality of portions in a closed housing having multiple inlets and outlets, the present invention suggests that the closed housing is divided into two chambers, each provided with at least one inlet and at least one outlet, and that in the first chamber a separating device is arranged, rotating at high speed, to separate undesired parts from the suspension via an outlet, the inlet of the second chamber comprising an opening arranged between the first chamber and the second chamber to transfer the suspension which has been substantially freed from undesired parts. Furthermore in the second chamber a rotor provided with blades is arranged, the rotor being connected to the separating device in the first chamber, the separating device and rotor being driven by a common shaft, and a screening device cooperating with the rotor, to divide the suspension into different fractions which leave the second chamber by individual outlets.

Apparatus for dividing a suspension of fibrous cellulose pulp

Mechanical cellulosic fibrous material pulp (mechanical pulp to produce paper products) having lower freeness, and enhanced light scattering properties, tensile and tear strengths, for a given energy input, is produced by force feeding a refiner. Using a progressive compacting plugscrew, cellulosic material (e.g. wood chips) is fed to the refiner inlet at a rate greater than the transporting capacity of the refiner (e.g. about 10-40% greater). The refiner preferably is a low frequency conical refiner with steam removal at the grinding area between the conical refiner elements. The production rate is regulated by sensing the axial force on the refiner rotor and controlling the spacing between the refiner elements in response to the sensed axial force. The screw has a compaction ratio of at least 3/1 for wood chips and 6/1 for pulp, and is rotated at about 6-10% the speed of rotation of the refiner rotor.

Growing community of inventors

Skoghall, Sweden

Ronny Hoglund