Condenser comprising a delivery tube and method for operating a condenser

Abstract

A liquefier with a cylindrical delivery tube comprises a rotatable spiral disposed in the delivery tube, wherein water intakes are disposed on the delivery tube. A centrifugal pump is preferably disposed downstream of the delivery tube, said centrifugal pump delivering the liquefied medium onward.

1 . A liquefier ( 1 ) with a delivery tube ( 2 ), which comprises an inlet ( 4 ) and an outlet ( 5 ) and in which a thick-stock conveyor ( 3 ) is disposed, wherein a centrifugal pump ( 12 ) is disposed at the outlet ( 5 ) of the delivery tube ( 2 ). 
     
     
         2 . The liquefier according to  claim 1 , wherein a main liquid intake ( 9 ) is disposed at the outlet of the delivery tube and before the centrifugal pump. 
     
     
         3 . The liquefier according to  claim 1 , wherein the main liquid intake has a directional component in the direction of the axis of the delivery tube ( 2 ). 
     
     
         4 . The liquefier according to  claim 1 , wherein the main liquid intake has a directional component in the direction of a circumferential line of the delivery tube ( 2 ). 
     
     
         5 . The liquefier according to  claim 1 , wherein a funnel ( 8 ) is disposed at the outlet ( 5 ) of the delivery tube ( 2 ). 
     
     
         6 . The liquefier according to  claim 5 , wherein an end of the thick-stock conveyor ( 3 ), the external diameter whereof tapers corresponding to the funnel ( 8 ), is disposed in the region of the funnel ( 8 ). 
     
     
         7 . The liquefier according to  claim 5 , wherein the centrifugal pump ( 12 ) is disposed directly at the tapered end ( 11 ) of the funnel ( 8 ). 
     
     
         8 . The liquefier according to  claim 5 , wherein the thick-stock conveyor ( 3 ), the funnel ( 8 ) and the centrifugal pump ( 12 ) are disposed on a straight line. 
     
     
         9 . The liquefier according to  claim 1 , wherein the thick-stock conveyor ( 3 ) is a screw. 
     
     
         10 . The liquefier according to  claim 1 , wherein the passage width of the thick-stock conveyor ( 3 ) in the delivery tube ( 2 ) increases from the inlet ( 4 ) to the outlet ( 5 ). 
     
     
         11 . The liquefier according to  claim 1 , wherein at the inlet ( 4 ) of the delivery tube ( 2 ), an intake ( 14 ) is disposed at right angles to the delivery direction of the thick-stock conveyor ( 3 ). 
     
     
         12 . The liquefier according to  claim 11 , wherein the delivery tube ( 2 ) comprises a widened portion ( 16 ) at the transition from the intake ( 14 ) to the delivery tube ( 2 ). 
     
     
         13 . The liquefier according to  claim 11 , wherein the intake ( 14 ) comprises a constriction ( 17 ) at the transition to the delivery tube ( 2 ). 
     
     
         14 . The liquefier according to  claim 11 , wherein a dumping height measuring device ( 21 ) is disposed in the intake ( 14 ). 
     
     
         15 . The liquefier according to  claim 11 , wherein a measuring device ( 18 ) for determining the hydrostatic pressure is disposed in the intake ( 14 ) or in the delivery tube ( 2 ). 
     
     
         16 . The liquefier according to  claim 1 , wherein auxiliary liquid intakes ( 6 ,  7 ) are disposed on the delivery tube ( 2 ). 
     
     
         17 . The liquefier according to  claim 1 , wherein a hydrocyclone is disposed at the outlet ( 5 ) of the centrifugal pump ( 12 ) and following the latter in the flow direction. 
     
     
         18 . The liquefier according to  claim 17 , wherein a line leads from the liquid outlet of the hydrocyclone directly before the inlet of the centrifugal pump ( 12 ). 
     
     
         19 . A method for operating a liquefier according to  claim 1 , wherein the material to be treated is pre-treated in a solid-stock storage unit with a total stock density of more than 15% GG total stock density, the total stock density is then reduced in the liquefier ( 56 ) to less than 10% GG, preferably less than 5% GG, and the liquefied material is delivered onward with a centrifugal pump ( 12 ). 
     
     
         20 . The method according to  claim 19 , wherein the liquefied material is delivered from the centrifugal pump ( 12 ) into a cyclone ( 66 ), preferably into a hydrocyclone, and is fractionated there. 
     
     
         21 . The method according to  claim 20 , wherein a fraction is delivered from the cyclone ( 66 ) back into the solid-stock storage unit. 
     
     
         22 . The method according to  claim 1 , wherein the solid-stock storage unit is a conditioner ( 30 ) with an agitator and a sieve ( 51 ), in which a fraction, such as in particular fibrous material, is separated from the material by the sieve ( 51 ). 
     
     
         23 . The method according to  claim 22 , wherein the liquid fraction is drawn off from the cyclone ( 66 ) through a preferably polished cone. 
     
     
         24 . The method according to  claim 1 , wherein at least 50% of the liquid is added in the region of the outlet of the delivery tube ( 2 ). 
     
     
         25 . The method according to claim  1 , wherein the pressure of the delivered material is measured in the liquefier ( 56 ). 
     
     
         26 . The method according to  claim 25 , wherein during the operation of the liquefier ( 56 ), the distance between the dumping height and the height of the liquid in the liquefier ( 56 ) is measured and kept in a predetermined range. 
     
     
         27 . The method according to  claim 25 , wherein pressurised water is added at the delivery tube ( 2 ) and/or at the outlet ( 5 ) of the delivery tube ( 2 ) and the value measured in the liquefier ( 56 ) is used to control a water intake ( 12 ) to the delivered material. 
     
     
         28 . The method according to  claim 25 , wherein the value measured in the liquefier ( 56 ) is used to control a drive ( 19 ) of the thick-stock conveyor ( 3 ). 
     
     
         29 . The method according to  claim 25 , wherein the value measured in the liquefier ( 56 ) is used to control a drive ( 20 ) of a pump ( 35 ) downstream of the delivery section.