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Agitator System for Disc Filters

A disc filter and agitator technology, which is applied in the direction of mobile filter element filter, filtration separation, regeneration of pulping liquid, etc., can solve the problem of reducing the filterability of the suspension

Active Publication Date: 2020-02-07
VALMET OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In disc filters where the suspended solids in the suspension are lime mud particles, it is necessary to limit the mechanical action on the particles as excessive pumping and agitation in the pump can reduce the particle size, and since the filter may be Clogging can radially reduce the filterability of the suspension

Method used

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  • Agitator System for Disc Filters
  • Agitator System for Disc Filters
  • Agitator System for Disc Filters

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Experimental program
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Embodiment Construction

[0029] Traditional Disc Filter Features

[0030] exist figure 1 and figure 2 Basic well-known details of disc filters are disclosed in .

[0031] A disc filter 1 is used to filter fine particulate material in a raw suspension and comprises a rotating hollow shaft 11 having a plurality of filter discs 12 rotating in a bucket 10 having at least a semicircular bottom Wall 10a, the semicircular bottom wall is located at the bottom of the disc filter. The filter disc discharges the filtrate via outlet 13 to the hollow shaft.

[0032]The scraper blade 30 is arranged parallel to the filter surface of the filter pan 12 and the collection trough is located below the scraper blade and forms a generally vertical box, such as a collection trough, with an upper opening 26 below the scraper blade and in the semicircular shape of the bucket. There is a lower outlet 27 in the lower part of the bottom 10a. The box, such as a collection trough, has two walls 29 a / 29 b oriented paralle...

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Abstract

The present invention relates to an improved agitator system for use in drums in disc filters which are used to filter out fine particles from the raw suspension. The agitator system of the present invention comprises: a first nozzle (31), arranged between two collecting tanks and between the two walls of these tanks oriented parallel to the filter surface of the filter disc (12), and a second Nozzles (32) arranged at one wall of the collection tank oriented normal to the filter surface of the filter disc, and wherein both the first nozzle (31) and the second nozzle (32) are oriented such that the flow from the nozzle The outflow streams (41 and 42 respectively) are consistent and parallel to the semi-circular shape of the barrel bottom (10a).

Description

technical field [0001] The present invention relates to a disc filter in which an agitation system is used in the vat to prevent fine particulate material from settling at the bottom of the vat. This problem is especially evident in disc filters used in recovery islands of pulp mills, where lime slurry particles are suspended in weak or strong liquids. The lime slurry particles quickly settle in the stagnant areas of the suspension of the disc filter and form a dense and incompressible lime cake deposit. Background technique [0002] Several solutions have been proposed to avoid sedimentation of suspended lime mud particles in disc filters. Among these stirrer systems are so-called "oversized" pumps, injectors or mechanical stirring elements. [0003] Celleco Hedemora AB (now Valmet AB) patent WO 93 / 23140 shows an example of the use of an "oversize" pump, where a single "oversize" pump is placed in the lowest position of the bucket. The "oversize" pump is characterized by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D33/21B01D33/23B01D33/46
CPCB01D33/21B01D33/463B01D33/466B01D33/68B01D33/23B01D33/46D21C11/00
Inventor P·比约恩瓦尔J·索德曼H·兰舍
Owner VALMET OY