Screen feed arrangement

Abstract

A screen feed arrangement for a pulp production process, comprising a discharge tank having an outlet, which is connected to an inlet of a discharge tank pump having an outlet, a dilution tank having an outlet, a screen feed pump having an inlet and an outlet, and a screening arrangement, wherein the outlet of the discharge tank and the outlet of the dilution tank are connected to the inlet of the screen feed pump, the outlet of which is connected to the screening arrangement, and that pulp which passes the outlet of the discharge tank has a mass concentration from about 8% to about 15%. A corresponding method for feeding pulp to a screen feed arrangement is also presented.

1 .- 7 . (canceled) 
     
     
         8 . A screen feed arrangement for a pulp production process, comprising a discharge tank having an outlet, which is connected to an inlet of a discharge tank pump having an outlet, a screen feed pump having an inlet and an outlet, and a screening arrangement, which outlet of the screen feed pump is connected to the screening arrangement, the outlet of the discharge tank being configured for discharge of pulp having a mass concentration from about 8% to about 15%,
 characterized by a dilution tank having an outlet, and in that the outlet of the discharge pump and the outlet of the dilution tank are via a three-way pipe connected to the inlet of the screen feed pump.   
     
     
         9 . The screen feed arrangement according to  claim 8 , characterized in that there is no dilution of the pulp in the discharge tank. 
     
     
         10 . The screen feed arrangement according to  claim 8 , characterized in that there are no agitators arranged in the discharge tank. 
     
     
         11 . The screen feed arrangement according to  claim 8 , characterized in that the discharge tank pump is a pump which is capable of pumping pulp having a mass concentration of about 8-15%. 
     
     
         12 . The screen feed arrangement according to  claim 8 , characterized in that the discharge tank has an inlet, which is connected to a digester. 
     
     
         13 . The screen feed arrangement according to  claim 8 , characterized in that the discharge tank has an inlet, which receives pulp coming from a process step provided between a digester and the screen feed arrangement. 
     
     
         14 . A method for feeding pulp to a screen feed arrangement, comprising the steps of:
 feeding pulp into a discharge tank via an inlet arranged in a top portion of the discharge tank, and   pumping pulp from the discharge tank via an outlet arranged in a bottom portion of the discharge tank by a discharge tank pump, the pulp at the inlet of 10 the discharge tank pump having a mass concentration of about 8% to 15%, the method being characterized by   diluting the pulp from the discharge tank pump with fluid from an outlet of a dilution tank in a three-way pipe connected to the inlet of a screen feed pump, and   feeding the screen feed arrangement with diluted pulp from an outlet of the screen feed pump.