KR0140202B1 - Apparatus for filtering emulsion and method thereof - Google Patents

Abstract

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Description

Method and apparatus for suspension or emulsion filtration

The accompanying drawings are schematic diagrams showing a connection device for operation of the device of the present invention.

* Description of the symbols for the main parts of the drawings *

1: filter bed 2: supply pipe

3: splitter 4: cone

5: air lift pump 6: transport pipe

The present invention relates to a method of filtration of suspensions or emulsions, or to an apparatus for achieving the method.

It is already known that filtration of suspensions or emulsions can be carried out by feeding the suspensions or emulsions into a filter bed containing filter media of particulate form and size. The filter media is placed in the tank and the suspension or emulsion flows upward through the filter, while the filter media flows downward through the filter tank. This sequence of operations involves supplying the suspension to be filtered to the lower part of the filter, draining the filtered liquid from the top or the top of the filter medium, transporting and cleaning the dirty filter material from the bottom of the filter, and placing it at the top of the filter. It was possible by returning. The inlet suspension flows upward through the filter in a flow opposite that of the filter media and the filtered liquid phase is discharged from the top or the top of the filter.

Such a method and apparatus for achieving the method are, for example, filtration as disclosed in U.S. Pat.Nos. 4,971,201 and 4,126,546, respectively, wherein the suspension is passed through the bottom or near the bottom of the tank via a feeder such as a pipe. Distributed in the lower part of the room; Feed pipes must pass through the dirtiest part of the room and can be a source of interference with dirty particles, which carries the risk of failure.

For example, the filtration device disclosed in US Pat. No. 4,126,546 includes a housing; A particle filter media zone in the housing defining a space extending in the device in a vertical direction; A device for supplying a suspension or emulsion to be filtered, positioned in the filter zone so that the suspension flows upwards through the filter medium; A space in the free communication tube and a support located below the feeding device, through which the filter medium is continuously supplied downward through the filter zone by the flow of the filter medium; In addition, there is a transportation device for supplying the filter medium, which is supplied to the space and soiled by filtration, while the cleaning device is provided with a device for returning the washed filter medium to the top surface of the filter paper.

The present invention is an improvement over the filtration described above, in particular the filtration disclosed in the above-mentioned US patents, the improvement consisting of the exclusion of the risk of hindering the movement of the filter media, in particular of the disturbance mentioned above.

On the other hand, the following advantages are achieved by the present invention.

Manufacture simpler housings with no feed vox, no upward facing pipe,

No need of check valve required for supply equipment

· No need for supply box with risk of sediment deposition,

There is no soaring pipe, there is no obstruction of the filter medium at the bottom (bottom cone) of the housing,

Simpler feed emissions,

Easier installation of devices in concrete pools

Easier to apply rubber to the housing when needed,

Aisle space between filtration equipment, with larger filtration equipment

Improved accessibility;

Less required floor surface.

The nature of the invention which achieves the above-mentioned advantages is described in the appended claims, with reference to the schematic diagram of the connecting device required for the operation of the device, with reference to the embodiments of the filtration method and the device according to the invention. It will be described in more detail.

The suspension or emulsion to be filtered is fed from the head pipe to the distributor 3, the feeder arranged at the bottom of the filter 1, via a feed pipe 2, which is a conduit, as indicated by arrow A. Each distributor of this embodiment has a V-shaped roof and a pipe spout at the bottom. This arrangement reduces the risk of blockage of the filter media near the pipe spout. Furthermore, this arrangement has the advantage that the most dirty filter medium, ie the filter medium passing through the distributor 3, continues downward and is no longer useful for filtration.

However, this part of the room is a danger zone for contaminated filter media, and any fine filtration that would impede constant flow down the filter media would be a potential source of obstruction. Therefore, it is an advantage of the operation of the filter that this part of the room is free from the suspension supply pipe. Here arrangements that smooth the downward movement of the filter media are more advantageous. For example, the cone 4 ensures that the filter media moves at essentially flat speed across the prefiltration zone.

Without the supply pipe at the bottom of the filtration tank, the structure of the tank would be simpler, for example, a suspension feed arrangement with a conventional distribution box and the feed pipe would have the bottom of the tank, which would present a risk of sediment deposition. And to the level above the spout of the transport system is completely excluded.

Close to the tank bottom is a transport spout airlift pump 5 which contains a transport pipe 6 and acts as air as the transport medium. The air is supplied from above along a pipe 7 running next to the transport pipe and through the holes in the lower part of the pipe to the transport pipe 6. The dirty filter medium is lifted up by the air and transported to the scrubber 8 located above the filter. Here, the filter medium meets with the cleaning liquid in the opposite direction of the flow. The cleaning liquid is supplied, for example, from a filtered liquid zone located above the filter and discharged as shown by arrow B, which is dirty during cleaning. The washed filter media is returned to the top surface of the filter paper.

According to the illustrative embodiment, the suspension feed pipa 2 is placed centrally into the room. In the embodiment as shown in the figure, the transport device 6 is arranged at the center of the room. The suspension feed pipe 2 can then advantageously be arranged concentrically around the transport.

As shown by the arrow, the filter media flows downward in the margin zone and the suspension to be filtered flows upward in the margin zone. The filtered liquid state over the marginal zone is discharged to an outlet (arrow C) via a weir (not shown). Sand is well adapted for use as a filter medium. Other possible filter media are plastic particles or mixtures of particulate materials and the like.

As can be seen in the figure, both the inlet and outlet are located on top of the filtration tank. This arrangement makes it easy to install a series of filtration tanks next to each other and in rows. The tanks can all be connected to the same supply and discharge pipes. Installation area will be reduced and accessibility is improved. Arrays of multiple units of tanks may be arranged in concrete pools.

Claims (6)

Suspensions or emulsions are fed to the filter media zone which forms the margin It flows upwards through the filter during its filtration and is discharged from the filter as a filtered liquid phase, the filter medium flows in the opposite direction of the suspension or emulsion through the inflow of the suspension or emulsion through the filter during filtering and then from the filter In a suspension or emulsion filtration method wherein the filter medium is separated and transported from the filter to the washing passage to wash the filter medium soiled by the washing liquid while flowing through the washing passage, and the suspension or the emulsion is filtered. A filtration method, characterized in that it is supplied to the inflow stream through the filtration downwards through the top surface of the filtration by the flow separated from the filtration. 2. A process according to claim 1 wherein a suspension or emulsion is fed centrally to said inflow through it. 3. A method according to claim 2, wherein the suspension or emulsion flows concentrically with respect to the transport of the filter medium into the wash passage. housing ; A particle filter zone in the housing forming a vertical space extending in the device; A device for supplying a suspension or emulsion to be filtered, which is positioned at the support so that the suspension or emulsion flows upwards through the filter; A space located below the feeder and in free communication with the filter bed, through which the filter medium is continuously supplied downward through the filter support by the flow of filter material; And a conveying device for pulling up the filter medium supplied to the space and soiled by filtration, wherein the washing device is provided with a device for returning the washed filter medium to the top surface of the filter paper. And (2) a device (2) extending from above the support and downward through the support to the feeder (3) to replenish a suspension or oil solution to the feeder. 5. Filtration device according to claim 4, characterized in that the conduit device (2) is arranged at the center of the device. The device of claim 4, wherein the transport device is arranged centrally within the device, Filtration device, characterized in that the conduit device (2) is arranged concentrically around the transport device (6).

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