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Apparatus and method for washing pulps

A pulp and equipment technology, applied in the field of pulp processing equipment, to achieve the effects of reducing costs, saving space, and reducing the number of equipment

Inactive Publication Date: 2011-02-02
ANDRITZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this equipment is that the wire is in contact with various pulps, which needs to be considered for the durability of the wire material

Method used

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  • Apparatus and method for washing pulps
  • Apparatus and method for washing pulps
  • Apparatus and method for washing pulps

Examples

Experimental program
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Embodiment Construction

[0034] Figure 1a A typical prior art equipment arrangement is shown where brown stock from a digester (CK) and blow pot (BT) is directed into, for example, a Drum Displacement Washer (DRUM DISPLACER -washer) (Andritz Oy)'s coarse stock washer (PreO 2 ). The washed brown stock is included in the reactor (O 2 l, O 2 Classification and oxygen delignification in the two-step oxygen stage (oxygen stage) of ll). Oxygen delignified pulp in a dedicated pulp washer (PostO 2 ) for washing. Figure 1a It is shown that a separate washer results in significant space requirements.

[0035] Such as Figure 1b It is shown that according to the invention two differently treated pulps from different treatment stages, in this case brownstock and oxygen delignified pulp, are both treated simultaneously in one washing plant. The structure of a washing plant designed for washing one type of pulp is changed such that by means of the internal structure of eg the intermediate wall 2, two separ...

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PUM

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Abstract

The present invention relates to an apparatus and a method for treating pulp. The apparatus comprises at least one water-permeable surface rotating around a shaft, onto which surface a layer is formed of pulp, means for feeding the pulp being treated into the apparatus, means for discharging the treated pulp from the apparatus and means for removing filtrates from the apparatus. A characterizing feature is that the apparatus is provided with at least one inside structure for forming at least two treatment sections in the apparatus in such a way that each section is connected to at least meansfor feeding one pulp so that the pulps being treated in the sections originate from essentially different treatment stages, to means for discharging the pulp so that the treated pulps are discharged from the apparatus separately from each other, and to means for removing filtrates so that the filtrates are removed from the apparatus separately from each other.

Description

technical field [0001] The invention relates to an apparatus for treating pulp comprising at least one rotating surface arranged around an axis, means for supplying pulp onto the rotating surface, means for discharging pulp from the apparatus and means for extracting pulp from the apparatus The apparatus is means for removing filtrate, wherein a pulp drum is formed on said rotating surface. The device is especially suitable for the washing of pulp. The invention also relates to a method. Background technique [0002] In the cellulose pulp industry, especially in the kraft pulp industry, liquid is removed from the pulp and / or the pulp is washed in different plants after cooking and between and after bleaching stages. After cooking and oxygen delignification the pulp is washed in a brown stock wash to recover black liquor and clean the pulp free of dissolved impurities. In conjunction with bleaching, the purpose of washing is to separate dissolved matter from the pulp after...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/06D21C9/02D21C9/10D21C
CPCD21C9/06D21C9/1057
Inventor 奥拉维·皮卡佩卡·特沃拉汉努·伦肯哈尤
Owner ANDRITZ AG