Process for guiding a suspension in a paper stock pulper and a paper stock pulper for conducting the process

Abstract

Paper stock pulper and process for guiding a suspension in paper stock pulper. The stock pulper includes a container having a side wall and front walls adjacent the side wall, and the process includes driving a plurality of rotors to produce a plurality of intake flows directed toward the side wall, deflecting the plurality of intake flows about 90° on the side wall so that the plurality of intake flows flow along at least a part of the side wall, and deflecting, with at least one flow directing device, at least a part of the suspension flowing along the side wall and flowing toward at least one of the front walls or an adjacent rotor from the at least one front wall or the adjacent rotor.

What is claimed:  
     
         1 . A process for guiding a suspension in a paper stock pulper, the stock pulper including a container having a side wall and front walls adjacent the side wall, comprising: 
 driving a rotor to produce an intake flow directed toward the side wall;    deflecting the intake flow about 90° on the side wall so that the intake flow flows along at least a part of the side wall;    deflecting, with at least one flow directing device, at least a part of the suspension flowing along the side wall and flowing toward at least one of the front walls from the at least one front wall.    
     
     
         2 . The process in accordance with  claim 1 , wherein the at least a part of the suspension is deflected downwards by the at least one flow directing device.  
     
     
         3 . The process in accordance with  claim 1 , wherein the at least a part of the suspension flow is deflected upwards by a flow directing device.  
     
     
         4 . The process in accordance with  claim 1 , wherein the at least a part of the suspension flowing upwards on the side wall is guided back into the container via a curved guide wall.  
     
     
         5 . The process in accordance with  claim 1 , wherein an intake eddy is produced in the container, and an axis of rotation of the intake eddy runs horizontally and crosswise to an axis of the rotor and the intake eddy rotates upwards on a wall opposite the side wall.  
     
     
         6 . The process in accordance with  claim 1 , wherein the rotor is located in the side wall, and an intake eddy is produced in the container, and the axis of rotation of the intake eddy runs horizontally and crosswise to an axis of the rotor and the intake eddy rotates upwards on the side wall.  
     
     
         7 . The process in accordance with  claim 1 , wherein the paper stock pulper is positioned under a paper machine as a broke slusher, and the process further comprises feeding broke from the paper machine into the paper stock pulper.  
     
     
         8 . A process for guiding a suspension in a paper stock pulper, the stock pulper including a container having a side wall and front walls adjacent the side wall, comprising: 
 driving a plurality of rotors to produce a plurality of intake flows directed toward the side wall;    deflecting the plurality of intake flows about 90° on the side wall so that the plurality of intake flows flow along at least a part of the side wall;    deflecting, with at least one flow directing device, at least a part of the suspension flowing along the side wall and flowing toward at least one of the front walls or an adjacent rotor from the at least one front wall or the adjacent rotor.    
     
     
         9 . The process in accordance with  claim 8 , wherein the at least a part of the suspension is deflected downwards by the at least one flow directing device.  
     
     
         10 . The process in accordance with  claim 8 , wherein the at least a part of the suspension flow is deflected upwards by a flow directing device.  
     
     
         11 . The process in accordance with  claim 8 , wherein the at least a part of the suspension flowing upwards on the side wall is guided back into the container via a curved guide wall.  
     
     
         12 . The process in accordance with  claim 8 , wherein an intake eddy is produced in the container, and an axis of rotation of the intake eddy runs horizontally and crosswise to an axis of the rotor and the intake eddy rotates upwards on a wall opposite the side wall.  
     
     
         13 . The process in accordance with  claim 8 , wherein the rotor is located in the side wall, and an intake eddy is produced in the container, and the axis of rotation of the intake eddy runs horizontally and crosswise to an axis of the rotor and the intake eddy rotates upwards on the side wall.  
     
     
         14 . The process in accordance with  claim 8 , wherein the paper stock pulper is positioned under a paper machine as a broke slusher, and the process further comprises feeding broke from the paper machine into the paper stock pulper.  
     
     
         15 . A paper stock pulper to guide a suspension in a paper stock pulper, comprising: 
 a container comprising a side wall, front walls adjacent said side wall, and an open top;    at least one rotor positioned in said side wall, said rotor being structured and arranged for slushing inserted paper and for producing an intake flow directed toward said side wall;    at least one flow directing device projecting from said side wall, said at least one flow directing device comprising a deflector having a leading edge which lies geodetically inside an outside diameter of said rotor and which is located a horizontal distance from a center of said rotor that is no further than two thirds of a horizontal distance between said center of said rotor and a nearer front wall, and having a trailing edge which lies geodetically outside the outside diameter of said rotor and which is located a horizontal distance from the nearer front wall no further than one-third of a horizontal distance between said center of said rotor and said nearer front wall.    
     
     
         16 . The paper stock pulper in accordance with  claim 15 , wherein an angle to the horizontal at said trailing edge is greater than about 70°.  
     
     
         17 . The paper stock pulper in accordance with  claim 15 , wherein said flow directing device is located on said side wall.  
     
     
         18 . The paper stock pulper in accordance with  claim 15 , wherein at least one flow directing device arranged to deflect the suspension upwards is located on each side of said rotor.  
     
     
         19 . The paper stock pulper in accordance with  claim 18 , wherein said at least one flow directing devices are located at a point in said side wall at which the intake flow is directed.  
     
     
         20 . The paper stock pulper in accordance with  claim 15 , wherein at least one flow directing device arranged to deflect the suspension downwards is located on each side of said rotor.  
     
     
         21 . The paper stock pulper in accordance with  claim 20 , wherein said at least one flow directing devices are located at a point in said side wall at which the intake flow is directed.  
     
     
         22 . The paper stock pulper in accordance with  claim 15 , wherein said rotor is arranged such that it has a lateral deviation from a horizontal center of said side wall of at least about 10% of a width of said side wall.  
     
     
         23 . The paper stock pulper in accordance with  claim 23 , wherein said deviation is directed towards said side wall on which the rotor rotates upwards during operation.  
     
     
         24 . The paper stock pulper in accordance with  claim 15 , wherein an angle of said deflectors with respect to horizontal increases at least on a part over an extent of their length from said leading edge to said trailing edge.  
     
     
         25 . The paper stock pulper in accordance with  claim 24 , wherein said angle of said deflectors increases from initially between about −15° to 5° to ultimately between about 70° to 90°.  
     
     
         26 . The paper stock pulper in accordance with  claim 15 , wherein said deflectors project at right angles from said side wall.  
     
     
         27 . The paper stock pulper in accordance with  claim 15 , wherein at least 80% of said deflectors project at least about 50 mm from said side wall.  
     
     
         28 . The paper stock pulper in accordance with  claim 15 , wherein an inside width of said container is at least twice a height of said container.  
     
     
         29 . The paper stock pulper in accordance with  claim 15 , wherein an inside width of said container is at least twice a depth of said container.  
     
     
         30 . The paper stock pulper in accordance with  claim 15 , wherein said at least one rotor comprises a plurality of rotors arranged next to one another to produce circulation of the suspension.