JP2020025913A - Gas-liquid separation device - Google Patents

Abstract

To provide a gas-liquid separation device which can separate a liquid and air bubbles from each other with a simple structure.SOLUTION: A partition plate 102 included in a gas-liquid separation device 100 according to the invention is attached to a swirl flow tank 101, which has an internal space partitioned into an upstream side space 101a provided with a liquid inlet 103 and a downstream side space 101b provided with a liquid outlet 104 and includes a mechanism which generates swirl flow in a liquid at the upstream side space 101a, and partitions the internal space into the upstream side space 101a and the downstream side space 101b. The partition plate 102 includes: a first portion 111 which is an outer periphery side portion of the partition plate 102; a second portion 112 which is an inner periphery side portion; and a third portion 113 which is a portion located therebetween. The third portion 113 includes: a first surface 112a facing the upstream side space 101a; and a second surface 112b facing the downstream side space 101b. The third portion 113 is provided with multiple through holes 114 which communicate with the first surface 112a and the second surface 112b.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gas-liquid separation device for separating bubbles from a liquid containing bubbles.

  Gas-liquid separators capable of removing air bubbles from liquids are used in many fields such as chemical plants and food processing. 2. Description of the Related Art As a structure of a gas-liquid separation device, there is a device that generates a swirling flow in a liquid and uses a centrifugal force to separate the liquid and bubbles.

  For example, Patent Literature 1 discloses a cleaning device including a cleaning tank and a partition. The cleaning liquid supplied into the cleaning tank generates a swirling flow by passing through a flow path formed by the partition, and the object to be cleaned is cleaned by fine bubbles contained in the cleaning liquid. Bubbles rise in the center of the swirling flow by the swirling flow and are discharged from the cleaning tank.

JP 2011-36815 A

  An object of the present invention is to provide a gas-liquid separator capable of separating liquid and air bubbles with a simple structure.

In order to achieve the above object, the gas-liquid separation device according to the present technology includes a partition plate. The partition plate has an internal space partitioned into an upstream space provided with a liquid inlet and a downstream space provided with a liquid outlet, and includes a swirl mechanism that generates a swirling flow in the liquid in the upstream space. A partition plate attached to the flow tank and dividing the internal space into the upstream space and the downstream space, a first portion being an outer peripheral portion of the partition plate, and an inner periphery of the partition plate; A second portion that is a side portion; and a third portion that is a portion between the first portion and the second portion.
The third portion includes a first surface facing the upstream space and a second surface facing the downstream space.
The third portion has a plurality of through-holes communicating with the first surface and the second surface.

  According to this configuration, when the swirling flow is formed in the space on the upstream side of the swirling flow tank, bubbles contained in the liquid move along the outer peripheral area of the swirling flow tank. When the swirling flow further continues, the bubbles contained in the liquid move to the inner peripheral region of the swirling flow due to a centrifugal force difference. For this reason, by providing a through-hole in the third portion located between the first portion on the outer peripheral side of the partition plate and the second portion on the inner peripheral side, the air bubbles can pass through the through-hole. And only the liquid passes through the through-hole. Thereby, only the liquid moves from the upstream space to the downstream space, and is discharged from the liquid outlet. That is, it is possible to remove bubbles from the liquid.

  The partition plate has a circular shape as viewed from the upstream space and the downstream space, and when the distance from the center of the partition plate to the outer periphery of the partition plate is 1, the plurality of through holes are: The center of the through hole may be provided in a range of 0.3 or more and 0.5 or less.

The first portion includes a third surface facing the upstream space, and a fourth surface facing the downstream space,
The first surface may be a surface protruding into the upstream space with respect to the third surface.

The second portion includes a fifth surface facing the upstream space and a sixth surface facing the downstream space,
The first surface may be a surface protruding from the fifth surface to the upstream space.

  A distance between the first surface and the second surface with respect to a diameter of the through hole in the first surface and the second surface may be 0.7 or more.

In order to achieve the above object, a gas-liquid separation device according to the present technology includes a swirling flow tank and a partition plate.
The swirling flow tank has an internal space partitioned into an upstream space provided with a liquid inlet and a downstream space provided with a liquid outlet, and includes a mechanism for generating a swirling flow in the liquid in the upstream space. .
The partition plate is a partition plate mounted on the swirling flow tank and partitions the internal space into the upstream space and the downstream space, and a first portion that is an outer peripheral portion of the partition plate. A second portion that is an inner peripheral portion of the partition plate, and a third portion that is a portion between the first portion and the second portion,
The third portion includes a first surface facing the upstream space and a second surface facing the downstream space, and the third portion includes the first surface and the second surface. A plurality of through holes communicating with the second surface are provided.

  As described above, according to the present technology, it is possible to provide a gas-liquid separation device that can separate liquid and air bubbles with a simple structure.

It is a perspective view of a gas-liquid separation device concerning an embodiment of the present invention. It is sectional drawing of the same gas-liquid separation apparatus. It is a perspective view of the partition provided in the same gas-liquid separation device. It is sectional drawing of the partition plate with which the gas-liquid separation apparatus is provided. FIG. 3 is a plan view of a partition provided in the gas-liquid separation device. It is sectional drawing of a part of partition plate with which the gas-liquid separation apparatus is provided. It is a schematic diagram which shows operation | movement of the same gas-liquid separation apparatus. It is a schematic diagram which shows operation | movement of the same gas-liquid separation apparatus. It is a graph which shows the relationship between the position of the through-hole of the partition plate with which the gas-liquid separation apparatus is equipped, and a gas outflow rate. It is a table | surface which shows the example of each part size of the gas-liquid separation apparatus. It is a graph which shows the time transition of the gas outflow rate of the same gas-liquid separation apparatus and a comparative example. It is a graph which shows the average value of the gas outflow rate of the same gas-liquid separation apparatus and a comparative example. It is sectional drawing which shows the other structure of the partition provided with the same gas-liquid separation apparatus. It is sectional drawing which shows the other structure of the partition provided with the same gas-liquid separation apparatus. It is sectional drawing which shows the other structure of the partition provided with the same gas-liquid separation apparatus.

  A gas-liquid separation device according to an embodiment of the present invention will be described. In the following description, a vertical direction is defined as a Z direction, and two directions orthogonal to each other along a horizontal direction are defined as an X direction and a Z direction.

[Configuration of gas-liquid separator]
FIG. 1 is a perspective view of a gas-liquid separation device 100 according to the present embodiment, and FIG. 2 is a cross-sectional view of the gas-liquid separation device 100. As shown in these drawings, the gas-liquid separation device 100 includes a swirling flow tank 101 and a partition plate 102.

  The swirling flow tank 101 is a tank that can store liquid. The swirling flow tank 101 is provided with a liquid inlet 103 and a liquid outlet 104. The swirling flow tank 101 can be formed in a cylindrical shape having a circular cross section on the XY plane and centered on the Z direction.

  The depth (Z direction) of the swirling flow tank 101 is preferably 1000 mm or less. The capacity of the swirling flow tank 101 is not particularly limited, but is preferably about 1 to 100 L. Further, the replacement time of the swirling flow tank 101, that is, the time required for replacing the liquid stored in the swirling flow tank 101 is preferably 30 seconds or more.

  The liquid inlet 103 is an opening communicating with the internal space of the swirl flow tank 101, is provided vertically above the swirl flow tank 101, and allows the liquid to flow into the swirl flow tank 101. A liquid inlet pipe 105 is connected to the liquid inlet 103.

  The liquid inlet pipe 105 extends in a tangential direction on the outer periphery of the swirling flow tank 101, and is configured so that the liquid flowing into the swirling flow tank 101 from the liquid inlet 103 forms a swirling flow (see FIG. 7). . The pipe size of the liquid inlet pipe 105 is preferably such that the flow velocity in the pipe is 1.0 to 1.5 m / s, and for example, 8A to 25A (JIS G 3459) can be used.

  The liquid outlet 104 is an opening communicating with the swirl flow tank 101 and is provided vertically below the swirl flow tank 101 to discharge liquid from the swirl flow tank 101. A liquid outlet pipe 106 is connected to the liquid outlet. The pipe size of the liquid outlet pipe 106 is preferably the same as that of the liquid inlet pipe 105.

  The partition plate 102 is mounted inside the swirl flow tank 101 so that its outer periphery matches the inner periphery of the swirl flow tank 101, and divides the internal space of the swirl flow tank 101 into two spaces. As shown in FIG. 2, in the internal space of the swirling flow tank 101, the space on the liquid inlet 103 side, which is vertically above the partition plate 102, is the upstream space 101 a, and is vertically below the partition plate 102. The space on the liquid outlet 104 side is referred to as a downstream space 101b.

  FIG. 3 is a perspective view of the partition plate 102, and FIG. 4 is a sectional view of the partition plate 102. FIG. 5 is a plan view of the partition plate 102. As shown in these drawings, the partition plate 102 has a disc shape with irregularities, and includes a first portion 111, a second portion 112, and a third portion 113.

  The first portion 111 is an annular portion on the outer peripheral side of the partition plate 102, and the second portion 112 is a disk-shaped portion on the inner peripheral side of the partition plate 102. The third portion 113 is an annular portion between the first portion 111 and the second portion 112.

  As shown in FIG. 5, the diameter of the outer periphery of the first portion 111 is defined as a diameter D. The diameter D corresponds to the inner diameter of the swirling flow tank 101. Assuming that the diameter of the outer periphery of the third portion 113 is the diameter D1, the diameter D1 is preferably 0.65D or more and 0.7D or less. When the diameter of the outer periphery of the second portion 112 is a diameter D2, the diameter D2 is preferably 0.2D or more and 0.4D or less.

  As shown in FIG. 4, the third portion 113 has a first surface 113a facing the upstream space 101a and a second surface 113b facing the downstream space 101b.

  The first portion 111 has a third surface 111a facing the upstream space 101a and a fourth surface 111b facing the downstream space 101b.

  The second portion 112 has a fifth surface 112a facing the upstream space 101a and a sixth surface 112b facing the downstream space 101b.

  Hereinafter, a surface along the second surface 113b as shown in FIG. FIG. 6 is a sectional view showing the height of each surface.

  As shown in the drawing, the first surface 113a is a surface protruding toward the upstream space 101a with respect to the third surface 111a and the fifth surface 112a, that is, the third surface 111a and the fifth surface 111a. The surface 112a is a surface whose height from the reference surface L is lower than the first surface 113a. The third surface 111a and the fifth surface 112a may be surfaces on the same plane, or may be surfaces having different heights from the reference plane L.

  As shown in FIG. 6, assuming that the height of the first surface 113a with respect to the third surface 111a is height T1, the height T1 is preferably 5 mm or more. Further, assuming that the height of the first surface 113a with respect to the fifth surface 112a is height T2, the height T2 is preferably 7 mm or more.

  The second surface 113b, the fourth surface 111b, and the sixth surface 112b may be surfaces on the same plane, or may be surfaces having different heights from the reference plane L.

  The third portion 113 is provided with a plurality of through holes 114 communicating with the first surface 113a and the second surface 113b.

  As shown in FIG. 5, the diameter of the through hole 114 is defined as a diameter H. 6, the depth of the through hole 114, that is, the distance between the first surface 113a and the second surface 113b is defined as a depth S.

  The diameter H of the through-hole 114 and the number of the through-holes 114 are set so that the flow velocity of the liquid passing through the through-hole 114 (hereinafter, the through-flow velocity) is 0.15 m / s or less as described later. However, the diameter H of the through hole 114 is preferably 10 mm or more. The number of the through holes 114 may be two or more. The aspect ratio (depth S / diameter H) of the through hole 114 is preferably 0.7 or more.

  The formation position of the through hole 114 is determined by C. D (Pitch Circle Diameter: diameter of a circle passing through the center of the through hole 114). In FIG. C. D is shown as diameter D3. P. of the through hole 114. C. D will be described later.

[Operation of gas-liquid separator]
The operation of the gas-liquid separation device 100 will be described. 7 and 8 are schematic diagrams showing the operation of the gas-liquid separation device 100.

  When a liquid containing bubbles is supplied from the liquid inlet 103 to the internal space of the swirling flow tank 101, a swirling flow is generated in the upstream space 101a as indicated by an arrow in FIG. The liquid flows through the through hole 114 into the downstream space 101b while forming a swirling flow, and is discharged from the liquid outlet 104. 7 and 8, the liquid surface E of the liquid forming the swirling flow is shown.

  The bubbles move to the outer peripheral region (A in the figure) of the upstream space 101a along the swirling flow flowing on the outer periphery of the upstream space 101a. The first portion 111 on the outer peripheral side of the partition plate 102 is not provided with a through hole, and the first surface 113a projects from the third surface 111a. Movement to the hole 114 is hindered, and air bubbles do not pass through the through hole 114.

  When the supply of the liquid from the liquid inlet 103 is continued and the flow velocity of the swirling flow is increased, as shown in FIG. 8, the bubbles move to the inner peripheral area (B in the figure) of the upstream space 101a due to a difference in centrifugal force. The second portion 112 on the inner peripheral side of the partition plate 102 is not provided with a through hole, and the first surface 113a protrudes from the fifth surface 112a. Movement to the through hole 114 is hindered, and air bubbles do not pass through the through hole 114.

  As described above, when the liquid containing bubbles is supplied from the liquid inlet 103 to the internal space of the swirling flow tank 101, the liquid flows from the upstream space 101a into the downstream space 101b through the through hole 114, It is discharged from the outlet 104. By providing the plurality of through holes 114 in the third portion 113, the swirling flow in the upstream space 101a is prevented from propagating to the downstream space 101b.

  Bubbles stay in the upstream space 101 a by the first portion 111 or the second portion 112 and are hardly discharged from the liquid outlet 104. Thereby, gas bubbles are removed from the liquid by the gas-liquid separation device 100, and gas-liquid separation is performed.

  As described above, the aspect ratio (depth S / diameter H) of the through hole 114 is preferably 0.7 or more. This is because, when the aspect ratio of the through hole 114 is less than 0.7, that is, when the depth S is smaller than the diameter H, the swirling vortex in the upstream space 101a propagates to the downstream space 101b, and the bubbles penetrate. This is because it is easy to pass through the hole 114.

  The liquid that can be gas-liquid separated by the gas-liquid separator 100 is typically water, but the gas-liquid separator 100 may be used for gas-liquid separation of a liquid having properties equivalent to water. It is possible.

[Position of through hole]
The position of the through hole 114 in the third portion 113 will be described. FIG. 9 is a graph of a simulation result showing the relationship between the position of the through hole 114 and the outflow rate of bubbles. The position of the through hole on the horizontal axis is the position of the center of the through hole 114 in the radial direction of the partition plate 102 when the distance from the center to the outer periphery of the partition plate 102 is 1, and the diameter of the partition plate 102 (see FIG. 5). Medium, diameter D) of P. C. D (diameter D3 in FIG. 5).

  The vertical axis represents the outflow rate of bubbles, and the outflow rate when the entire amount of bubbles flowing in from the liquid inlet 103 is discharged from the liquid outlet 104 is set to 1.

  As shown in the figure, when the center of the through-hole 114 is located in the range of 0.2 or more and 0.5 or less, the outflow rate of bubbles is small. On the other hand, when the position of the center of the through hole 114 exceeds 0.5, the outflow rate of the bubbles increases. This is because, when the through-hole 114 is located on the outer peripheral side of the partition plate 102, the bubbles collected in the outer peripheral area A of the upstream space 101a (see FIG. 7) easily pass through the through-hole 114.

  If the position of the center of the through hole 114 is less than 0.2, the outflow rate of the bubbles increases. This is because, when the through-hole 114 is located on the outer peripheral side of the partition plate 102, bubbles collected in the inner peripheral area B of the upstream space 101a (see FIG. 8) easily pass through the through-hole 114.

  Therefore, assuming that the distance from the center of the partition plate 102 to the outer periphery is 1, the position of the center of the through hole 114 in the radial direction of the partition plate 102 is preferably in the range of 0.3 to 0.5.

[Example of size of gas-liquid separator]
FIG. 10 is a table showing an example of the size of each part of the gas-liquid separation device 100. As shown in the drawing, when the capacity of the swirling flow tank 101 is 5 L and the flow rate (supply flow rate) of the liquid supplied to the swirling flow tank 101 is 10 L / min, the liquid in the swirling flow tank 101 is replaced. The time is 30 seconds.

  When the size of the liquid inlet pipe 105 and the liquid outlet pipe 106 is 10 A, the flow velocity in the pipe is 1.08 m / s, and the angular velocity of the swirling flow is 16.7 rad / s.

  Assuming that the diameter H of the through holes 114 of the partition plate 102 is 12 mm, the number of the through holes 114 is 10, and the depth S of the through holes 114 is 10 mm, the flow rate of the liquid passing through the through holes 114 (through flow rate) is 0.15 m. / S.

[Comparison results between Examples and Comparative Examples]
A comparison result between the embodiment of the present invention and a comparative example will be described. The example is a gas-liquid separator 100, and the comparative example has a configuration in which a partition plate 102 is removed from the gas-liquid separator 100.

  FIG. 11 is a graph showing the time transition of the gas outflow rate. The gas outflow rate indicates the rate of bubbles contained in the liquid discharged from the liquid outlet when the liquid mixed with bubbles at a rate of 0.02% by volume is continuously supplied from the liquid inlet to the swirling flow tank. .

  FIG. 12 is a graph showing the average value of the gas outflow rate shown in FIG. 11 until the liquid in the swirl flow tank is replaced. As shown in the drawing, the gas outflow rate in the example is smaller than that in the comparative example, and air bubbles can be removed from the liquid.

[Modification]
The configuration of the partition plate 102 is not limited to the above. 13 to 15 are cross-sectional views illustrating another configuration of the partition plate 102. FIG.

  As shown in FIG. 13, the fifth surface 112a is located on the same plane as the first surface 113a, that is, the second portion 112 and the third portion 113 have a height from the reference plane L. They may be the same.

  Further, as shown in FIG. 14, the third surface 111a is located on the same plane as the first surface 113a, that is, the first portion 111 and the third portion 113 are higher than the reference surface L. May be the same.

  Further, as shown in FIG. 15, the fifth surface 112a and the third surface 111a are located on the same plane as the first surface 113a, that is, the first portion 111, the second portion 112, and the third May have the same height from the reference plane L.

  13 to 15, it is possible to suppress bubbles passing through the through-hole 114. However, in a configuration in which the first surface 113a protrudes from the third surface 111a and the fifth surface 112a (see FIG. 4), bubbles are effectively prevented from flowing into the through holes 114 from the inner peripheral side and the outer peripheral side. The highest effect can be obtained.

  Further, in the gas-liquid separation device 100, the liquid inlet pipe 105 is provided so as to extend in a tangential direction on the outer periphery of the swirl flow tank 101 as described above, thereby generating a swirl flow in the liquid in the upstream space 101a. However, the present invention is not limited to this configuration. For example, a stirring blade may be provided inside the upstream space 101a, and the swirling flow may be generated by rotating the stirring blade.

101 ... swirling flow tank 101a ... upstream space 101b ... downstream space 102 ... partition plate 103 ... liquid inlet 104 ... liquid outlet 105 ... liquid inlet piping 106 ... liquid outlet piping 111 ... first part 111a ... third surface 111b ... 4th surface 112 ... 2nd portion 112a ... 5th surface 112b ... 6th surface 112a ... surface 113 ... 3rd portion 113a ... 1st surface 113b ... 2nd surface 114 ... through hole

Claims (6)

It has an internal space partitioned into an upstream space provided with a liquid inlet and a downstream space provided with a liquid outlet, and is mounted on a swirling flow tank provided with a mechanism for generating a swirling flow in the liquid in the upstream space. A partition plate for partitioning the internal space into the upstream space and the downstream space,
A first portion that is an outer peripheral portion of the partition plate; a second portion that is an inner peripheral portion of the partition plate; and a portion between the first portion and the second portion. A third part,
The third portion includes a first surface facing the upstream space, and a second surface facing the downstream space,
A gas-liquid separator including a partition plate, wherein the third portion is provided with a plurality of through holes communicating with the first surface and the second surface. The gas-liquid separation device according to claim 1,
The partition plate has a circular shape when viewed from the upstream space and the downstream space, and when the distance from the center of the partition plate to the outer periphery of the partition plate is 1, the plurality of through holes are: A gas-liquid separator in which the center of the through hole is provided within a range of 0.3 or more and 0.5 or less. The gas-liquid separation device according to claim 2, wherein
The first portion includes a third surface facing the upstream space and a fourth surface facing the downstream space,
The first surface is a surface protruding into the upstream space with respect to the third surface. The gas-liquid separation device according to claim 2 or 3,
The second portion includes a fifth surface facing the upstream space and a sixth surface facing the downstream space,
The first surface is a surface protruding into the upstream space with respect to the fifth surface. The gas-liquid separation device according to any one of claims 1 to 4,
The distance between the first surface and the second surface with respect to the diameter of the through hole in the first surface and the second surface is 0.7 or more. A swirling flow tank having an internal space partitioned into an upstream space provided with a liquid inlet and a downstream space provided with a liquid outlet, and having a mechanism for generating a swirling flow in the liquid in the upstream space;
A partition plate attached to the swirling flow tank and dividing the internal space into the upstream space and the downstream space, a first portion being an outer peripheral portion of the partition plate, A second portion that is an inner peripheral portion, and a third portion that is a portion between the first portion and the second portion,
The third portion includes a first surface facing the upstream space and a second surface facing the downstream space, and the third portion includes the first surface and the second surface. And a partition plate provided with a plurality of through holes communicating with the second surface.

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