DE1536927C

DE1536927C - Process for filtering liquids by means of capillary filtration and filters for carrying out the process

Info

Publication number: DE1536927C
Authority: DE
Inventors: Jiro Osaka Sasaki (Japan)
Original assignee: Toshin Science Co., Ltd., Osaka (Japan)
Publication date: 1972-10-12

Description

rung bei der in Fig. 1 dargestellten Ausführungsform, tion in the embodiment shown in Fig. 1,

F i g. 4 einen vertikal geführten Teilschnitt durch den Vorderabschnitt des Filterbehälters in der Ausführungsform nach Fig. 1,F i g. 4 shows a vertically guided partial section through the front section of the filter container in the embodiment according to Fig. 1,

F i g. 5 eine Seitenansicht des in F i g. 4 gezeigten Filterbehälters,F i g. 5 is a side view of the FIG. 4 shown filter container,

F i g. 6 einen vertikal geführten Teilschnitt (einzelne Teile fortgelassen) durch den in dem Filterbehälter nach F i g. 4 befindlichen Filterkörper,F i g. 6 shows a vertically guided partial section (individual parts omitted) through the in the filter container according to FIG. 4 located filter body,

F i g. 7 eine Seitenansicht des Filterkörpers nach F i g. 6,F i g. 7 is a side view of the filter body according to FIG. 6,

F i g. 8 einen Schnitt längs der Linie 8-8 in Fig. 6.F i g. 8 shows a section along the line 8-8 in FIG. 6.

Gemäß den in den Fig. 1 bis 8 gezeigten Ausführungsformen steht eine Zuleitung 10 für die zu behandelnde Trübe in Verbindung mit einer Filtrationskammer 13, die zusammen mit einer Filtratsammelkammer 20 innerhalb eines Filterbehälters 11 liegt. In der Zuleitung 10 für die zu behandelnde Trübe liegt eine Förderpumpe 12, welche die Trübe aus einem nicht gezeichneten Vorratsbehälter in die Filtrationskammer 13 des Filterbehälters 11 durch die Zuleitung 10 hindurchdrückt. Die Zulaufmenge wird durch einen Einlaßschieber 16 am Filterbehälter geregelt. Durch eine Uberlaufleitung 14 wird der Überschuß der zu behandelnden Trübe in den nicht gezeichneten Vorratsbehälter zurückgeleitet. Zur Regelung des Überlaufs dient ein Absperrventil 15. Der Druck in der Filtrationskammer 13 wird durch einen Druckmesser 17 angegeben. Dieser Druck in der Kammer 13 läßt sich durch Öffnen oder Schließen der Ventile 15 und 16 regeln. Da der Überschuß der Trübe über die Leitung 14 ohne Einschränkung in den nicht gezeigten Vorratsbehälter abgeführt werden kann, gibt der an der Filtrationskammer 13 angeordnete Druckmesser 17 meistens eine Nullanzeige an.According to the embodiments shown in FIGS is a supply line 10 for the pulp to be treated in connection with a filtration chamber 13, which together with a filtrate collection chamber 20 within a filter container 11 located. In the feed line 10 for the pulp to be treated there is a feed pump 12 which feeds the pulp from a storage container (not shown) into the filtration chamber 13 of the filter container 11 the supply line 10 pushes through. The inflow is controlled by an inlet valve 16 on the filter container regulated. Through an overflow line 14, the excess of the pulp to be treated is not in the drawn reservoir returned. A shut-off valve 15 is used to regulate the overflow. The pressure in the filtration chamber 13 is indicated by a pressure gauge 17. This print in the chamber 13 can be regulated by opening or closing the valves 15 and 16. Because the excess the pulp can be discharged via line 14 into the storage container, not shown, without restriction can, the arranged on the filtration chamber 13 pressure gauge 17 usually gives a zero display on.

Im Filterbehälter 11 sind ein Paar dickwandige Filterkörper 18 und 19 angeordnet. An dem einen Ende des hohlen Teils der Filterkörper 18,19 befinden sich Öffnungen 21 und 22 für das Filtrat. Diese öffnungen führen in die Filtratsammelkammer 20. Diese Kammer 20 weist eine Auslaßleitung 23 für die gereinigte Flüssigkeit auf. In dieser Leitung ist eine Saugpumpe 24 angeordnet, die die gereinigte Flüssigkeit aus der Filtratsammelkammer 20 durch die Auslaßleitung 23 abführt. Der Druck in der Kammer 20 wird durch einen Druckmesser 25 angezeigt, wobei sich der Druck in der Kammer 20 durch Öffnen oder Schließen eines Regelventils 27 in der Regelleitung 26, eines Auslaßventils 28 für den Filterbehälter 11 und eines Auslaßventils 29 für das Filtrat regeln läßt. Der Boden des Filterbehälters ist mit 30 bezeichnet und weist einen Schlammablaß auf; ferner sind eine Luftleitung 31, ein Klärbehälter 32 und ein Durchflußmesser 33 vorgesehen.A pair of thick-walled filter bodies 18 and 19 are arranged in the filter container 11. On the one At the end of the hollow part of the filter body 18, 19 there are openings 21 and 22 for the filtrate. These openings lead into the filtrate collection chamber 20. This chamber 20 has an outlet line 23 for the purified liquid on. In this line, a suction pump 24 is arranged, which the cleaned Liquid discharges from the filtrate collection chamber 20 through the outlet line 23. The pressure in the chamber 20 is indicated by a pressure gauge 25, the pressure in the chamber 20 being increased by opening or closing a control valve 27 in the control line 26, an outlet valve 28 for the filter container 11 and an outlet valve 29 can be regulated for the filtrate. The bottom of the filter canister is with 30 denotes and has a sludge drain; furthermore there is an air line 31, a clarification tank 32 and a flow meter 33 is provided.

ίο Jeder Filterkörper 18,19 besteht aus einem mit vielen Öffnungen versehenen Hohlrohr 34 und einem das Hohlrohr 34 abdeckenden Filterelement 35, das unzählige kapillare Durchlässe aufweist.ίο Each filter body 18,19 consists of one with many openings provided hollow tube 34 and a hollow tube 34 covering filter element 35, the has innumerable capillary passages.

Die zu behandelnde Trübe, die die Filtrationskammer 13 vollständig anfüllt, tritt durch die von dem Filterelement 35 der Filterkörper 18,19 dargebotenen Kapillaren infolge der Durchlaufeigenschaften der kapillaren Durchlässe selbst durch die Öffnungen des Hohlrohres 34 und die Öffnungen 21,The slurry to be treated, which completely fills the filtration chamber 13, passes through the from the filter element 35 of the filter body 18, 19 presented capillaries due to the flow properties the capillary passages themselves through the openings of the hollow tube 34 and the openings 21,

ao 22 für gereinigte Flüssigkeit in die Filtratsammelkammer 20 ein. Sobald diese Kammer vollständig mit gereinigter Flüssigkeit gefüllt ist, werden die Durchlaß- und Zirkulationseigenschaften der kapillaren Durchlässe der Filterelemente 35 der beiden Filterkörper 18,19 aufgehoben.ao 22 for purified liquid into the filtrate collection chamber 20. Once this chamber is complete with Purified liquid is filled, the passage and circulation properties of the capillaries Passages of the filter elements 35 of the two filter bodies 18, 19 are canceled.

In diesem Fall ist das Abziehen des Filtrates aus der Filtratsammelkammer 20 erforderlich, um die Durchlaßeigenschaften der kapillaren Durchlässe der Filterelemente 35 wiederherzustellen. Die erforderliehe Menge kann durch die Auslaßleitung 23 von der Saugpumpe 24 durch Öffnen des Regelventils 27 abgeführt werden. Bei der beschriebenen Anlage zum Filtrieren von Flüssigkeiten bleiben feine Verunreinigungen oder suspendierte Körnchen an der die Trübe berührenden Fläche des Filterelementes hängen. Weil aber fast kein Druck auftritt, der die Bewegung verstärken würde, fallen die haftengebliebenen Teilchen sofort herunter und schlagen sich auf dem Boden 30 des Filterbehälters 11 nieder und können durch den Schlammablaß abgelassen werden. Da die freie Durchtrittsgeschwindigkeit in den kapillaren Durchlässen der Filterelemente sehr gering ist, können die feinen Körnchen oder suspendierten Körnchen nicht in die kapillaren Durchlässe eindringen. Der Reinigungseffekt ist daher außerordentlich hoch, und die Filterfläche bleibt ständig sauber, so daß keine Druckänderung auf Grund einer Änderung der nach der Filtration abgezogenen Menge auftritt.In this case, the withdrawal of the filtrate from the filtrate collection chamber 20 is necessary to the To restore the passage properties of the capillary passages of the filter elements 35. The required Amount can be fed through the outlet line 23 from the suction pump 24 by opening the control valve 27 be discharged. In the system described for filtering liquids, fine impurities remain or suspended granules cling to the sludge contacting surface of the filter element. because but there is almost no pressure that would increase the movement, the adhered particles fall immediately down and fall on the bottom 30 of the filter container 11 and can through the Sludge drain. Because the free passage speed in the capillary passages of the filter element is very small, the fine granules or suspended granules cannot penetrate into the capillary passages. The cleaning effect is therefore extremely high, and the The filter surface remains constantly clean, so that no change in pressure due to a change in the after Filtration withdrawn amount occurs.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 have 2 measurements, i.e. H. are dimensioned so that the claims: liquid component of the water-air mixture sucked in through the sieve casing under action

1. A method for filtering liquids of the capillary forces at least over part of the length of the channels marked by capillary filtration, which fills their entire cross-section,
draws that the pressure difference between the sludge supply and the filtrate discharge is disadvantageous in these known designs, so that, since the sludge is matched either by the weight, that the filtration force or by a pressure difference by the only takes place at that speed, which is unimportant - The filter is pushed through, deposits form on the top of the filter through the surface area of the capillary passages, which must be removed by special flow properties in atmospheric devices in order to determine the fiI-spherical pressure. keep it operational.

2. Filter for liquids for implementation In contrast, the invention is the task zudes Method according to claim 1 with, in one reason, the indicated disadvantages of the well-known filter container arranged capillary filter, whereby 15 th procedures or facilities to be avoided and the filter container has a sludge inlet, a filter not influenced by pressure or gravity, sontratauslaß and has a sludge outlet, where only the capillary forces for a continuous characterized in that the filter (11) can be used in a filtration.

Filtration chamber (13) and a filtrate collection This object is achieved according to the invention

chamber (20) is subdivided, the chamber 20 solving that the pressure difference between the pulp (13) with a feed pump (12) and a supply and the filtrate discharge in such a way overflow (14) for the pulp is provided and matched to the that the filtration takes place only with that ( g chamber (20) a pump (24) for conveying away speed, which is only provided by that of the filtrate and for monitoring capillary passages in the filter body with its own pressure difference between the turbid flow properties Atmospheric supply and the filtrate discharge to the chambers pressure is determined.

(13, 20) each have a pressure gauge (17 or 25) arranged by the method according to the invention for

net is. Difference to the known processes or

3. Filter according to claim 2, characterized in that the contaminating part is marked, that on the filter container (11) two 30 surfaces of the sludge through without any influence Filter body (18, 19) arranged one above the other, the pressure of the liquid loosely on the surface are, each of which adhere to the lower end of the hollow of the filter and only through their body (34) a weight drop into the filtration plenum, so that the surface of the filter (20) has leading outlet opening (21, 22). remains clean and therefore additional input

4. Filter according to claim 2, characterized marked 35 directions for keeping the filter clean, that the filter body (18) in per se rest.

known manner from one with many openings to carry out the provision according to the invention Hollow tube (34) and a hollow drive with a filter for liquids, an in tube-covering, innumerable capillary filters arranged in a filter container, wolasses having filter element (35). 4 ° at the filter container has a sludge inlet, a fiI-

has step outlet and a sludge drain, according to the invention, the filter container is in a filtration chamber and a filtrate collection chamber divided, / V

wherein the chamber with a feed pump and a

45 provided overflow for the pulp and on the chamber

The invention relates to a method for filtration - a pump is provided for conveying away the filtrate

ren of liquids by means of capillary filtration and is and for monitoring the pressure difference

a filter for liquids to carry out the between the sludge supply and the filtrate discharge

Procedure. . a pressure gauge is arranged on each of the chambers.

A filtering process is already known in which the slurry is placed on an endless belt of filter cloth in the filter containers, the bottom of which is arranged one above the other with an end body, each of which is running loose belt of felt connected is. In this case, at the lower end of the hollow body, a pressure is exerted on the liquid located in the fiI by the force of gravity of the outlet opening leading to the filter cloth tration collecting chamber, whereby 55 points. . ■■ '.;.
Finally, the invention provides that the fluid penetrates the cloth, which exceeds the throughput speed caused by the capillary filter body in a manner known per se from a throughput speed with many openings and a hollow tube borrowed. . the hollow tube covering countless capillaries

There is also a cylinder mold for paper machines with a filter element with 60 passages,

an evacuable support cylinder known, which in the drawings is a preferred embodiment

shown outside, leaving a gap, a guide form of the subject invention;

with openings provided screen jacket, through which the figures show the following in detail:

the space between the screen jacket and the F i g. 1 is a front view of an embodiment

Support cylinder with its interior in connection 65 of the subject matter of the invention,

stands. Here, the surface of the screen jacket is marked with F i g. FIG. 2 is a side view of the FIG. 1 illustrated

the openings in the support cylinder above the intermediate embodiment,

space-forming channels connected, the capillary Fig. 3 is a schematic sketch of the line routing