DE311128C

DE311128C -

Info

Publication number: DE311128C
Application number: DE1918311128D
Authority: DE
Priority date: 1918-01-27
Filing date: 1918-01-27
Publication date: 1919-02-25

Description

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Die sogenannte Starkstromspülung für Filter mit loser Filtermasse besteht bekanntlich darin, daß das gesamte Waschwasser während der Filterperiode unter der Filtermasse angesammelt und dann in ganz kurzer Zeit durch die Filtermasse geschickt wird. Es kommt hierbei sehr darauf an, daß die gesamte Fläche _v der Filtermasse schnell und gleichmäßig durch das Waschwasser erfaßt wird, so daß sie zunächst in ihrer Gesamtheit zur Schwebe gelangt und dann auseinanderbricht, um hierdurch die Lockerung des Schlammes zu begünstigen. Die Beförderung des Waschwassers . unter das Filterbett erfolgte hierbei bisher beiThe so-called high-voltage flushing for filters with loose filter material is known to consist of the fact that all of the washing water is collected under the filter material during the filter period and is then sent through the filter material in a very short time. It is very important here that the entire surface _{v of} the filter mass is quickly and evenly covered by the washing water, so that it first floats in its entirety and then breaks apart, thereby promoting the loosening of the sludge. Carrying out the washing water. under the filter bed took place here so far at

kleineren Filtern von einem mittleren Punkte aus in der Form einer Wassersäule,: die sich an ihrem Kopf radial unter dem Filterbett ausbreitet. Nur'wenn das Filter recht klein und im Grundriß kreisrund ist, entsteht hierbei eine, Verteilung des Waschwassers unter dem Filterbett derart, daß dieses annähernd gleichzeitig und gleichmäßig auf seiner ganzen Fläche erfaßt wird. Ist der Querschnitt quadratisch, so ist selbst bei kleineren Filtern die Gleichmäßigkeit nicht gesichert, da das aus einem mittleren Punkt ankommende Wasser sich in einer Kreisfläche ausbreitet und die Ecken des Filterbettes nicht gleichzeitig und gleichmäßig beeinflußt. Noch ungleichmäßiger - wird die Wirkung, wenn das Filter, wie es bei großen Filtern oder Filtergruppen meistens der Fall ist, einen rechteckigen, also langgestreckten, Grundriß aufweist. In diesem Falle hilft man sich damit, daß man unter dem Filterbett auf seiner Längsachse mehrere Punkte vorsieht, von denen aus das Waschwasser (durch Röhren) in die Höhe steigt. Das Waschwasser steigt also hierbei in der Form zahlreicher Säulen in die Höhe, die sich oben einzeln in einer Kreisfläche ausbreiten. Somit ergibt sich am Kopf jeder Wassersäule der vorhin bei einem quadratischen Einzelfilter erwähnte Übelständ, daß das Wasser nicht gleichzeitig und gleichmäßig zu den Ecken der Quadrate gelangt, als deren Mittelpunkt die einzelnen Wassersäulen anzusehen sind.smaller filters from a central point in the shape of a water column: which are at her head spreads radially under the filter bed. Only if the filter is quite small and is circular in plan, this creates a distribution of the washing water under the filter bed in such a way that it is almost simultaneously and evenly over its entire length Area is detected. If the cross-section is square, even with smaller filters the Uniformity not ensured because the water coming from a central point spreads in a circular area and the corners of the filter bed not at the same time and equally affected. Even more uneven - the effect will be if the filter like it in the case of large filters or filter groups, a rectangular, i.e. elongated, Has floor plan. In this case one helps oneself by being under the Filter bed provides several points on its longitudinal axis, from which the washing water (through pipes) rises in the air. The wash water rises in the form numerous columns in the height, which spread out individually in a circular area at the top. Consequently at the top of each water column the same applies to a square single filter mentioned inconvenience that the water does not reach the corners at the same time and evenly of the squares, as the center of which the individual columns of water are to be seen.

Um nun die so wichtige gleichzeitige und gleichmäßige Erfassung des gesamten Filterbettes durch das Wasch wasser auch bei größeren, langgestreckten Filtern zu erreichen, wird der Erfindung gemäß das Waschwasser nicht mehr an einzelnen Punkten, sondern auf einer ganzen Linie in der Richtung der Filterlängsachse angehoben. Diese Linie kann sowohl in der Längsachse selbst oder auch' an den Längsseiten des Filters liegen, worauf dann an jeder Längsseite eine solche Linie anzunehmen ist. Im ersten Fall steigt also das Wasser durch einen mittleren Längsschacht, im zweiten Fall aber durch zwei seitliche Längsschächte in die Höhe, um sich dann unter dem Filterbett zu verteilen.Now about the so important simultaneous and uniform coverage of the entire filter bed can be achieved through the washing water even with larger, elongated filters Invention according to the washing water no longer at individual points, but on one Raised all along the line in the direction of the filter's longitudinal axis. This line can do both in the longitudinal axis itself or also 'on the longitudinal sides of the filter, whereupon then such a line is to be assumed on each long side. So in the first case it increases Water through a central longitudinal shaft, but in the second case through two lateral shafts Longitudinal shafts upwards to then be distributed under the filter bed.

Die Folge dieses,. Verfahrens ist, daß das Wasser sich nun nicht mehr in Kreislinien, sondern in parallelen Linien nach rechts und links verteilt, deren Summe durch die gesamte rechteckige Filterfläche gebildet ist. Die Gleichmäßigkeit und Gleichzeitigkeit der Wirkung wird hierdurch wesentlich verbessert. Noch mehr ist dies der Fall, wenn man die Verteilung des Wassers unter dem Filterbett dadurch vorbereitet, daß die Wasserschicht schonThe consequence of this. The procedure is that the water is no longer in circular lines, but distributed in parallel lines to the right and left, their sum through the whole rectangular filter surface is formed. The evenness and simultaneity of the effect is significantly improved as a result. This is even more the case when you consider the distribution of the water under the filter bed prepared by the fact that the water layer is already

(2. Auflage, ausgegeben am 7. April igssrj (2nd edition, issued on April 7 , igssrj

/J/ J

Claims

is gradually widened as they rise vertically by gradually widening the cross-section of the vertical shafts upwards. If you want to go further-S, you can give the permeable filter floor a total free cross-section that is smaller than the corresponding shaft cross-section for the rising washing water. In this way, a moderate overpressure is created under the filter base, which continues to have a beneficial effect on the even transition of the washing water into the filter bed. In the drawing, diagrams of two embodiments are shown in cross-section in a purely schematic manner. a is the space for the accumulated washing water, b is the filter mass, and c is its permeable bottom, d is a vertical shaft placed in the longitudinal axis of the elongated filter ao in space α, the cross-section of which widens upwards. This shaft merges into the ceiling f of the room a, which appropriately rises slightly to the side. The water enters the shaft d in the direction of the arrow, begins to distribute itself in this and then spreads evenly under the filter base c to the left and right, so that the filter mass δ is detected almost simultaneously and evenly at all points. The water lifts the filter mass b, which breaks apart, whereupon the water takes the loosened sludge with it and somehow drains off with it. The embodiment according to FIG. 2 differs from the previous one only in that a vertical shaft d is provided on each longitudinal side of the space α. The effect is otherwise the same. In the case of very wide filters, several longitudinal shafts could also be distributed accordingly over the cross-section of the filter. Feeding the washing water line by line through longitudinal shafts instead of point by point through pipes also has advantages for the construction and maintenance of the filter. The individual tubes, mostly made of iron, have to be connected individually to the ceiling f, which is cumbersome and expensive, but above all results in leaks in the company. The tubes must be relatively wide, since they must feed the water to a square area of the filter bed corresponding to the distance between the tubes. This narrows the space; which is annoying when looking at the filter for the purpose of making repairs. The longitudinal shafts, on the other hand, can easily be made of concrete in such a way that they easily merge into the ceiling of the washing water room, which is also made of concrete. This makes it very easy to attach and completely eliminates the risk of leaks. The cross-section of these longitudinal shafts can be relatively small, since their longitudinal extent is relatively large. As a result, especially when the shafts are provided on the side walls, the washing water space is better exposed for cleaning, repairs and the like. 70 godparents τ-an proverbs:

1. Process for washing out filters with loose filter material by so-called Power flushing, characterized in that the washing water on an uninterrupted Line is raised in the direction of the longitudinal axis.

2. The method according to claim 1, characterized in that the washing water a moderate overpressure is applied under the filter base.

3. Filter with a device for carrying out the method according to claim 1 and 2, characterized in that below the filter bed one in the longitudinal axis of the filter extending, upwardly widened shaft is provided, which the Washing water leads from the washing water space under the filter bed. .

4. Filter according to claim 3, characterized in that instead of the middle Longitudinal shaft lateral or several according to the cross-section of the filter distributed longitudinal shafts are arranged.

5. Filter according to claim 3 and 4, characterized in that the ceiling of the Wash water space to the longitudinal shaft or the longitudinal shafts with a certain slope.

1 sheet of drawings,