Method and a Device for the Dewatering of a Fibre Suspension Supplied by a Nozzle Assembly

Abstract

A vertically elongate and oriented container ( 1 ) of wire cloth material contains a vertically oriented nozzle assembly ( 2 ), which sprays a fiber suspension against the inner wall of the container. The nozzle assembly is revolved around the axis of the container and is displaced backwards and forwards vertically so that the suspension sprays, which in the direction radially outward widen against the shell wall of the container ( 1 ) afford a cleaning effect in respect of deposited fibers on the inner wall of the container ( 1 ) at the same time as the liquid of the suspension efficiently is separated through the container wall in order to then be collected in a housing ( 9 ) surrounding the container ( 1 ).

1 - 10 . (canceled) 
     
     
         11 . A method for the dewatering of a fiber suspension, comprising the steps of:
 introducing from above a fiber suspension under pressure through a nozzle assembly into an elongate tubular vertically orientated container made of a fiber separation material;   wherein the elongate tubular vertically orientated container defines a vertically orientated axis;   wherein the nozzle assembly has a plurality of nozzles spaced-apart around the axis of the container and wherein the nozzle assembly is placed centrally in the elongate tubular vertically orientated container; and   displacing the nozzle assembly in an axial direction along the axis of elongate tubular vertically orientated container.   
     
     
         12 . The method of  claim 11  wherein the nozzle assembly is displaced backwards and forwards along the axial direction of the elongate tubular vertically orientated container. 
     
     
         13 . The method of  claim 11  wherein the container is kept stationary. 
     
     
         14 . The method of  claim 11  wherein the nozzle assembly is imparted a rotary motion in relation to the container about the axis of the container. 
     
     
         15 . The method of  claim 12  wherein the nozzle assembly is imparted a rotary motion in relation to the container about the axis of the container. 
     
     
         16 . The method of  claim 13  wherein the nozzle assembly is imparted a rotary motion in relation to the container about the axis of the container. 
     
     
         17 . The method of  claim 11 , wherein the fiber suspension is sprayed through a plurality of groups of nozzles which groups of nozzles are spaced-apart in the axial direction along the nozzle assembly. 
     
     
         18 . The method of  claim 11 , wherein the fiber separation material is a wire cloth. 
     
     
         19 . A device for the dewatering of a fiber suspension, comprising:
 an elongate and vertically orientated tubular container of a liquid-permeable fiber-separating material which defines a vertical axis and an inner circumference wall;   a nozzle assembly connected to a source of pressurized fiber suspension, and placed centrally in the elongate and vertically orientated tubular container; and   wherein the nozzle assembly has a plurality of nozzles, which are arranged to direct sprays of a fiber suspension against the inside of the circumference wall of the elongate and vertically orientated tubular container.   
     
     
         20 . The device of  claim 19 , wherein the liquid-permeable fiber-separating material is a wire cloth. 
     
     
         21 . The device of  claim 19 , wherein the nozzle assembly has a plurality of groups of nozzles spaced-apart along the nozzle assembly, the nozzles of the groups being spaced-apart being circumferentially spaced on the nozzle assembly. 
     
     
         22 . The device of  claim 19 , wherein the nozzle assembly is mounted for rotation to a driving assembly so as to be driven in rotation about the vertical axis of the container. 
     
     
         23 . The device of  claim 20 , wherein the nozzle assembly is mounted for rotation to a driving assembly so as to be driven in rotation about the axis of the container. 
     
     
         24 . The device of  claim 20 , wherein the nozzle assembly is mounted to the driving assembly for reciprocal motion along the axis of the elongate and vertically orientated tubular container, and wherein said vertically orientated tubular container is stationarily mounted;
 a housing spaced from and enclosing the vertically oriented tubular container and arranged to collect suspension liquid from the source of pressurized fiber suspension; and   wherein the housing has portions forming a bottom drainage arranged to lead away suspension liquid from the housing.   
     
     
         25 . The device of  claim 23 , wherein the nozzle assembly is mounted to the driving assembly for reciprocal motion along the axis of the elongate and vertically orientated tubular container, and wherein said vertically orientated tubular container is stationarily mounted, and further comprising:
 a housing spaced from and enclosing the vertically oriented tubular container and arranged to collect suspension liquid from the source of pressurized fiber suspension; and   wherein the housing has portions forming a bottom drainage arranged to lead away suspension liquid from the housing.   
     
     
         26 . The device of  claim 19 , further comprising a valve device connected to a lower end part of the elongate and vertically orientated tubular container and arranged to enable selectable leading out of a suspension fraction having elevated fiber content from the lower end part of the container. 
     
     
         27 . The device of  claim 25 , further comprising a valve device connected to a lower end part of the elongate and vertically orientated tubular container and arranged to enable selectable leading out of a suspension fraction having elevated fiber content from the lower end part of the container.