JPH11290617A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter in which gas is introduced into a raw liquid chamber filled with raw liquid without releasing a cake layer accumulated on the surface of a filter element. SOLUTION: The filter is equipped with a housing 12, a partition plate 20 for dividing the inside of the housing 12 into a raw liquid chamber 14 and a filtrate chamber 16, a liquid inlet 72 communicated with the raw liquid chamber 14, a liquid outlet 82 communicated with the filtrate chamber 16 and at least one piece of filter element 30 which is arranged in the raw liquid chamber and has a cylindrical shape. In this case, the inside of the cylinder of the filter element 30 is communicated with the filtrate chamber 16 and also a plenty of gas-introducing holes 22, 24 for pressurizing the raw liquid chamber 14 are provided in the partition plate 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter, and more particularly, to a filter in which a plurality of gas introduction holes for pressurizing a stock solution chamber are provided in a partition plate.

[0002]

2. Description of the Related Art A filter is used to separate a stock solution in which a solid substance is suspended or suspended. Such a filter typically has a housing, a partition plate that divides the interior of the housing into a stock solution chamber and a filtrate chamber, and a filter element arranged in the stock solution chamber. The stock solution is introduced into the stock solution chamber and then passes through the filter element. At this time, the solid substance in the stock solution is deposited as a cake layer on the outer surface of the filter element. On the other hand, the filtrate from which the solid substance has been removed is introduced into the filtrate chamber.

[0003] When the value of the stock solution is high, it is desirable to recover the stock solution as much as possible. In some cases, it is desirable to recover as much of the solid substance in the stock solution as possible. In any case, an operation of further filtering the undiluted solution remaining in the undiluted solution chamber after completion of the filtration to remove a solid substance is performed. As a typical operation, a pressurized gas is introduced into the stock solution chamber, and the stock solution remaining in the stock solution chamber is filtered. In the latter case, for example, in the case where the solid substance is an expensive catalyst, in the case of a compound obtained through a multi-step reaction, or in the case of waste such as a radioactive substance which cannot be released to the outside, etc. is there.

[0004]

However, in this operation, gas is introduced into the stock solution chamber filled with the stock solution, so that bubbles are generated in the stock solution or at the interface between the gas and the stock solution, and bubbles are generated. There is a risk that the cake layer will be peeled off by the vibration caused by the vibration. When the solid particles are to be recovered as much as possible, only a part of the surface of the cake layer may fall off, and the effort up to that point may be wasted.

In Japanese Patent Publication No. 4-35202, a gas introduction hole for pressurizing a stock solution chamber is provided on a side surface of a housing. However, since the gas introduced from the gas introduction hole is easily arranged to directly hit the cake layer deposited on the surface of the filter element, the cake layer may be peeled off by the impact of the introduced gas.

Accordingly, an object of the present invention is to provide a filter capable of introducing gas into a stock solution chamber filled with a stock solution without removing a cake layer deposited on the surface of a filter element. And

[0007]

In the present invention, a plurality of gas introduction holes for pressurizing the stock solution chamber are provided in the partition plate. Thus, the gas can be introduced into the stock solution chamber filled with the stock solution without peeling off the cake layer deposited on the surface of the filter element. Further, it is possible to more uniformly pressurize the liquid surface of the stock solution.

That is, according to a first aspect of the present invention, a housing; a partition plate for dividing the interior of the housing into a stock solution chamber and a filtrate chamber; a liquid inlet communicating with the stock solution chamber; and a communication with the filtrate chamber. A filter, comprising: a liquid outlet; and at least one filter element disposed in the undiluted liquid chamber and having a cylindrical shape, wherein the inside of the cylinder of the filter element communicates with the filtrate chamber, and A filter is provided, wherein a plurality of gas introduction holes for pressurizing the stock solution chamber are provided in the partition plate.

In the present invention, it is preferable to have a branching means connected to each of the gas introduction holes. The branch point of the branch means may be arranged inside the filtrate chamber, inside the partition plate, or outside the housing.

[0010] Preferably, the branching means includes a manifold arranged in the filtrate chamber. Alternatively, a branch point of the branching means may be arranged outside the housing.

Further, it is preferable that the gas introduction hole is formed in the partition plate so that the gas introduced into the stock solution chamber is introduced in a direction parallel to the filter element or in a direction away from the filter element. .

Still further, it is preferable that the filter element is fixed to the partition plate; and each of the gas introduction holes has an introduction portion extending in a direction substantially parallel to an axial direction of the filter element.

[0013] It is preferable that a collection pipe for collecting the liquid inside the cylinder of the filter element is provided.

[0014] In a second aspect of the present invention, the above-mentioned filter;
A filtration system comprising: a supply line communicating with the liquid inlet; a filtrate line communicating with the liquid outlet; and a gas line communicating with the gas introduction hole.

In the present invention, it is preferable that a pressure line is connected to the gas line.

Further, it is preferable to have a circulation line connected to the supply line and the filtrate line.

According to a third aspect of the present invention, there is provided a method for producing a filtrate or a cake layer, characterized by using the above-mentioned filter.

According to a fourth aspect of the present invention, there is provided a method for producing a filtrate or a cake layer, characterized by using the above-mentioned filtration system.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.
A housing 12 and a stock solution chamber 14
And a partition plate 20 for partitioning into a filtrate chamber 16.

The housing 12 typically has a cylindrical shape, and its end 18 is preferably conical. This is because the cake layer or the collected solid is easily collected at the end portion 18.

It is preferable that the undiluted solution chamber 14 is located below the partition plate 20 and the filtrate chamber 16 is located above the partition plate 20 by the partition plate 20.

In the stock solution chamber 14, at least one filter element 30 is arranged. Filter element 30
Has a cylindrical shape, and the interior 34 of the cylinder communicates with the filtrate chamber 16. That is, one end 36 of the filter element 30 is preferably closed by a sealing cap and the other end 38 is preferably open by an opening cap.

The filter element 30 is not limited to a particular type. The filter element 30 consists of a porous medium, typically formed in a cylindrical shape. The porous medium may be a porous thin film or a porous metal medium. In addition, pleats may be formed in the porous medium, or pleats may not be formed.

The filter element 30 is fixed to the partition plate 20, and is preferably fixed to the partition plate 20 via an adapter 40.

In FIG. 1, the inside 3 of the cylinder of the filter element 30 is shown.
4 has a collection pipe 50 for collecting the liquid, particularly the filtrate remaining in the cylinder interior 34. The collection pipe 50 is provided from the inside 34 of the filter element 30 via the adapter 40.
It extends into the filtrate chamber 16. In FIG. 1, the collection tube 50 is bent in the filtrate chamber 16, but may be connected to the collection line above the housing 12 without bending.

The end 52 of the collection tube 50 is preferably close to the end 36 of the filter element 30 without touching it. Alternatively, the end 36 of the filter element 30 may be provided with a depression, and may extend so that the end 52 of the collection tube 50 does not contact the depression.

In the present invention, a plurality of gas introduction holes 22 and 24 for pressurizing the stock solution chamber 14 are provided in the partition plate 20. In FIG. 1, both of the gas introduction holes 22 and 24 penetrate the partition plate 20 in the thickness direction.

In FIG. 1, the directions of the gas introduction holes 22 and 24 extend in a direction substantially parallel to the axial direction of the filter element 30. The introduction portions of the gas introduction holes 22 and 24 are arranged radially outward from the outer surface 32 of the filter element 30. Therefore, the gas introduced from the gas introduction holes 22 and 24 does not directly hit the cake layer deposited on the outer surface of the filter element 30. Alternatively, the axial direction of the gas introduction hole may be in a direction away from the outer surface of the filter element 30.

In FIG. 1, a manifold 60 is provided inside the filtrate chamber 16. The manifold 60 has branches 62 and 64, each of which has a gas introduction hole 2.
2, 24.

The filter 10 is preferably provided with a differential pressure gauge 56 for detecting a pressure difference between the undiluted solution chamber 14 and the filtrate chamber 16. For example, the differential pressure gauge 56 may detect a pressure difference via the line 57 and the line 58. Alternatively, a piezoelectric element may be provided in each of the undiluted solution chamber 14 and the filtrate chamber 16 to convert the pressure into a voltage and detect a voltage difference.

A supply line 70 for supplying the undiluted solution from the undiluted solution tank 76 to the undiluted solution chamber 14 communicates with the undiluted solution chamber 14 of the filter 10 via a liquid inlet 72 provided in the housing 12. A supply valve 74 controls the supply of the stock solution.
The supply line 70 is connected to the stock solution chamber
It is preferable that a cleaning liquid line 77 for supplying a cleaning liquid to the cleaning liquid is connected. A valve 78 controls the supply of the cleaning liquid.

A filtrate line 80 for discharging the filtrate is provided
It communicates with the filtrate chamber 16 of the filter 10 via a filtrate outlet 82 provided in the housing 12. A drain valve 84 controls the drain of the filtrate. It is preferable that a circulation line 86 that guides the filtrate to the supply line 70 is connected to the filtrate line 80. A valve 88 controls the circulation of the filtrate.

A collection line 90 for discharging the filtrate inside the cylinder of the filter element 30 is connected to the collection pipe 50. A drain valve 94 controls the drain of the filtrate.

A line 100 connects to the manifold 60 via a fluid port 102 provided in the housing 12. A pressurizing line 107 is connected to the line 100, and pressurized gas can be introduced into the gas introduction holes 22 and 24 via the gas line 100 and the manifold 60. A valve 108 controls the introduction of the pressurized gas.
If necessary, the manifold 60 and the line 1
Through 00, gas or liquid in the stock solution chamber 14 can be removed.

The upper part of the housing 12 has an exhaust line 110 for discharging gas. Valve 11
4 controls the emission of gas. In the exhaust line 110,
Pressurizing line 11 for introducing pressurized gas into filtrate chamber 16
6 are preferably connected. A pressure valve 118 controls the introduction of pressurized gas. Alternatively, the pressure line
Without connecting to the exhaust line 110, the housing 12
May be connected directly to the top of the device.

On the other hand, a line 120 for discharging a stock solution to a tank 125 is provided below the housing 12.
A valve 124 controls the discharge of the stock solution. Further, it is preferable that a circulation line 126 for guiding the undiluted solution to the undiluted solution tank 76 is connected to the line 120. Valve 12
8 controls the circulation line 126.

Hereinafter, a method of using the filter of the present invention will be described.

The circulation valve 88, the cleaning liquid valve 78, and the valve 128 are kept closed unless otherwise specified.

The exhaust valve 114, the valve 124, and the valve 84 are opened, and the liquid in the undiluted liquid chamber 14 and the liquid in the filtrate chamber 16 are removed. On the other hand, the supply valve 74 and the valve 104 are closed. If desired, pressurizing valve 108 or pressurizing valve 11
8 may be opened and pressurized air introduced to ensure removal of the liquid.

Next, as shown in FIG. 2, the stock solution chamber 14 is filled with the stock solution. The valves 114, 94, 124 and the valve 84 are closed. Further, the pressure valve 108 and the pressure valve 118 are closed. The supply valve 74 and the valve 104 are opened. Then, the stock solution is filled into the stock solution chamber 14 from the stock solution tank 76. The undiluted solution is returned from the line 100 to the undiluted solution tank 76 through the gas introduction holes 22 and 24 and the manifold 60. Since the exhaust valve 114, the recovery valve 94, and the filtrate valve 84 on the filtrate side are closed, the filtrate chamber 1
6, a constant pressure is maintained, and the undiluted solution in the undiluted solution chamber 14 is
It does not pass through the filter element 30 and the interior 34 of the filter element 34 remains gaseous.

Next, as shown in FIG. 3, filtration is started. The valve 104 is closed, and the exhaust valve 114 and the filtrate valve 84 are opened. The undiluted solution in the undiluted solution chamber 14 permeates the filter element 30 and moves from the inside of the cylinder 34 to the filtrate chamber 16,
It is discharged from the discharge valve 84. Here, when the filtrate reaches the upper part of the filtrate chamber 16 and the gas in the filtrate chamber 16 is removed, the exhaust valve 114 is closed. In this state, the filtration is continued.

Next, preferably, the filtrate is passed through a circulation line 8.
Circulate through 6. Thereby, the solid substance in the stock solution can be removed as much as possible. In this case, the circulation valve 88 of the circulation line 86 is opened, and the discharge valve 84 is opened.
Close. Supply valve 74 is left open. Then, the filtrate discharged from the filtration chamber 16 is passed through the circulation line 86.
Through the supply line 70. As the filtrate circulates, the stock solution in the stock solution chamber 14 is diluted with the filtrate, and the solid particles contained in the liquid in the stock solution chamber 14 decrease.

As the filtration proceeds, a cake layer 33 is deposited on the outer surface 32 of the filter element 30, and the pressure loss between the undiluted solution chamber 14 and the filtrate chamber 16 increases. When the pressure loss reaches a certain value by the differential pressure gauge 56, the recovery of the filtrate is started.

In order to collect the filtrate, a pressurizing valve 10
8 and release valve 84 are opened. Also, the collection valve 94 may be opened to increase the collection speed. Supply valve 7
4 and the circulation bubble 88 are closed. Also, the exhaust valve 11
4 remains closed. As shown in FIG. 4, the pressurized gas is introduced into the stock solution chamber 14 filled with the liquid via the manifold 60 and the plurality of gas introduction holes 22 and 24.
At this time, the pressurized gas is introduced into the stock solution chamber 14 from the plurality of gas introduction holes 22 and 24, so that it is easy to uniformly apply pressure to the liquid surface. In addition, bubbles are less likely to be generated at or below the liquid surface. Accordingly, the outer surface 32 of the filter element 30
Is difficult to peel off the cake layer 33 deposited on the substrate. Further, the gas introduction holes 22 and 24 are provided on the outer surface 32 of the filter element 30.
It is preferable to dispose it outside in the radial direction.
This makes it difficult for the pressurized gas to further peel off the cake layer 33.

In this step, as shown in FIG. 5, the liquid remaining in the undiluted liquid chamber 14 further passes through the filter element 30, and the liquid level of the liquid gradually decreases from the position of the partition plate 20. I will do it. The filtrate in the filtrate chamber 16 is
It is mainly discharged from the discharge line 84. On the other hand, the filtrate in the filter element 30 is mainly collected by the collection pipe 50 and the collection line 9.
Emitted from 0.

After the filtrate in the filtrate chamber 16 and the filter element 30 has been recovered, it is preferable to recover the filtrate contained in the cake layer deposited on the filter element 30.
Specifically, the pressure valve 108 and the collection valve 94 are kept open, and the discharge valve 84 is closed. Pressurizing valve 1
From 08, a pressurized gas is introduced into the stock solution chamber 14, and the liquid component in the cake layer is further recovered from the recovery pipe 50.

Next, as shown in FIG.
Is opened, and the liquid remaining at the bottom 18 in the stock solution chamber 14 is
It is preferable to collect in the stock solution tank 76. Through the filtrate circulation step, the residual liquid has a reduced content of suspended solids. Then, the stock solution in the stock solution tank 76 can be diluted with such a remaining liquid.

Next, as shown in FIG. 7, the cake layer deposited on the filter element 30 may be washed. The cleaning liquid valve 78 is opened, and the cleaning liquid in the cleaning liquid tank 79 is introduced into the undiluted liquid chamber 14. At this time, the valve 104 is opened, then the exhaust valve 114 is opened, and the washing liquid is introduced into the filtrate chamber 16. When the cleaning liquid reaches each nozzle, the valves 104 and 114 are sequentially closed. The used cleaning liquid is supplied through the valve 84 or, if necessary, the valve 9.
It may be discharged from the filter 10 via 4.

When the filter element 30 is backwashed,
A part of the filtrate chamber 16 is filled with the washing liquid. Next, the pressure valve 118 is opened to apply pressure to the inside of the housing 12. Then, while the pressurizing valve 118 is open, the valve 1
Open 24. The washing liquid in the filtrate chamber 16 and the stock solution chamber 14 is discharged to the tank 125 at a stretch. At this time, the cleaning liquid permeates from the inside 34 of the filter element 30 to the outside, and the cake layer 33 is also discharged to the tank 125.

Finally, the pressure valve 118 is closed and the exhaust valve 114 is opened to stop the operation.

In FIG. 1, a manifold 60 serving as a branching means connected to the gas inlet is disposed inside the filtrate chamber 16. However, the branching means connected to the gas introduction hole may be mainly arranged outside the housing. This is because when the filter is small, there may not be enough space for disposing the branching means inside the housing.

FIG. 8 shows another embodiment of the filter of the present invention. Hereinafter, the same members as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 8, the gas line 100 is connected to the branch point 10.
At 5, the process branches to a branch 106a and a branch 106b. The branches 106a and 106b are connected to pipes 65 and 6 respectively.
6 and the pipes 65 and 66 are respectively connected to the gas introduction holes 2.
2 and 24. The branches 106a and 106b are shown in FIG.
As shown in FIG. 5, a pipe formed in the circumferential direction outside the housing 12 may be used.

FIG. 10 shows another embodiment of the filter of the present invention. In FIG. 10, the gas line 100 has a branch point 105.
Branches to a branch 106a and a branch 106b. And
The branches 106a, 106b are respectively connected to the housing 20
Are connected to the gas introduction holes 25 and 26 via the. The partition plate 20 is provided with gas introduction holes 25 and 26 that communicate from the side surface 28 of the partition plate 20 to a surface 29 facing the stock solution chamber 14. Each of the gas introduction holes 25, 26 has an introduction portion 25x, 26x extending in a direction substantially parallel to the axial direction of the filter element 30.

FIG. 11 shows another embodiment of the filter of the present invention. The filter 10a has a housing 12a and a partition plate 20a for dividing the inside of the housing 12a into a stock solution chamber 14a and a filtrate chamber 16a.

In FIG. 11, two filter elements 30a and 30b are arranged in the stock solution chamber 14a. Each of the filter elements 30a and 30b has a cylindrical shape,
The insides 34a and 34b of the cylinder communicate with the filtrate chamber 16a.
In the filter elements 30a, 30b, the side surfaces 32a, 32
The filtration is not limited to b, but can be performed on the end faces 36a and 36b.

The filter elements 30a and 30b are connected to the partition plate 20a via adapters 40a and 40b, respectively.
It is fixed to.

In FIG. 1, the filter elements 30a, 30b
Has a collection pipe 50a for collecting the liquid inside the cylinders 34a and 34b, especially the filtrate remaining in the cylinders. The recovery pipe 50a has branches 51a and 51b.
1a and 51b are filter elements 30a and 30b, respectively.
Of the cylinder 34a, 34b.

A plurality of gas introduction holes 22a, 24a, 26a for pressurizing the stock solution chamber 14a are provided in the partition plate 20a. These gas introduction holes 22a, 24a, 26
The direction a extends in a direction substantially parallel to the axial direction of the filter element 30a. Further, the gas introduction holes 22a, 24
a, 26a are the side surfaces 3 of the filter elements 30a, 30b
It is arranged radially outward from 2a and 32b. Therefore, the gas introduced from the gas introduction holes 22a, 24a, 26a does not directly hit the cake layer deposited on the outer surfaces of the filter elements 30a, 30b.

The inside of the filtrate chamber 16a contains the manifold 6
0a is provided. Manifold 60a branches 6
2a, 64a, and 66a, which are connected to the gas introduction holes 22a, 24a, and 26a, respectively.

[0061]

According to the present invention, by providing a plurality of gas introduction holes for pressurizing a stock solution chamber in a partition plate, a cake layer deposited on the surface of a filter element can be removed without peeling.
A gas can be introduced into a stock solution chamber filled with the stock solution. Further, it is possible to more uniformly pressurize the liquid surface of the stock solution.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the filter of the present invention.

FIG. 2 is a cross-sectional view of one embodiment of the filter of the present invention.

FIG. 3 is a cross-sectional view of one embodiment of the filter of the present invention.

FIG. 4 is an enlarged view of A in FIG. 3;

FIG. 5 is a sectional view of an embodiment of the filter of the present invention.

FIG. 6 is a sectional view of an embodiment of the filter of the present invention.

FIG. 7 is a sectional view of an embodiment of the filter of the present invention.

FIG. 8 is a sectional view of another embodiment of the filter of the present invention.

FIG. 9 is a top view of the filter of FIG. 8;

FIG. 10 is a sectional view of another embodiment of the filter of the present invention.

FIG. 11 is a sectional view of another embodiment of the filter of the present invention.

[Explanation of symbols]

10 filter, 12 housing, 14 stock solution chamber, 16
... filtration chamber, 18 ... end, 20 ... partition plate, 22 ... gas introduction hole, 24 ... gas introduction hole, 25 ... gas introduction hole, 25x ...
Introducing part, 26 ... Gas introducing hole, 26x ... Introducing part, 30 ... Filter element, 34 ... Inside of cylinder, 38 ... End, 40 ... Adapter, 42 ... Protrusion, 50 ... Recovery line, 52 ... End
56 ... differential pressure gauge, 57 ... line, 58 ... line, 60 ... manifold, 62 ... branch, 64 ... branch, 70 ... supply line, 74 ... supply valve, 76 ... stock solution tank, 77 ... washing liquid line, 78 ... valve, 79 ... washing liquid tank, 80
... filtrate line, 84 ... discharge valve, 86 ... circulation line,
Reference numeral 88: circulation valve, 90: recovery line, 94: discharge valve, 100: gas line, 102: gas port, 104: valve, 105: branch point, 106a: branch, 106b: branch, 107: pressurization line, 108: Pressurizing valve, 110
... Exhaust line, 114 ... Exhaust valve, 116 ... Pressure line, 118 ... Pressure valve, 120 ... Line, 124 ... Valve, 125 ... Tank, 126 ... Circulation line, 128 ...
valve

Claims (12)

[Claims] 1. A housing; a partition plate for dividing the interior of the housing into a stock solution chamber and a filtrate chamber; a liquid inlet communicating with the stock solution chamber; a liquid outlet communicating with the filtrate chamber; And a filter having at least one filter element having a cylindrical shape, wherein the inside of the cylinder of the filter element communicates with the filtrate chamber and pressurizes the stock solution chamber. Wherein the gas introduction hole is provided in the partition plate. 2. The filter according to claim 2, further comprising a branching means connected to each of the gas introduction holes. 3. The filter according to claim 2, wherein said branching means includes a manifold located in said filtrate chamber. 4. The filter according to claim 3, wherein a branch point of the branching means is disposed outside the housing. 5. The gas introduction hole is formed in the partition plate such that gas introduced into the undiluted liquid chamber is introduced parallel to the filter element or in a direction away from the filter element. The filter according to any one of claims 1 to 4. 6. The filter element according to claim 1, wherein the filter element is fixed to the partition plate; and each of the gas introduction holes has an introduction portion extending in a direction substantially parallel to an axial direction of the filter element. The filter as described. 7. The filter according to claim 1, further comprising a collecting pipe for collecting a liquid inside the cylinder of the filter element. 8. The filter according to claim 1, a supply line communicating with the liquid inlet, a filtrate line communicating with the liquid outlet, and a gas line communicating with the gas introduction hole. A filtration system having: 9. The filtration system according to claim 8, wherein a pressure line is connected to the gas line. 10. The filtration system according to claim 8, further comprising a circulation line connected to the supply line and the filtrate line. 11. A method for producing a filtrate or a cake layer, comprising using the filter according to claim 1. 12. A method for producing a filtrate or a cake layer, comprising using the filtration system according to claim 8.