JP2011167682A - Air bubble generation device and gas-liquid contact device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bubble generation device capable of changing gas passed by to air bubbles with desired uniform diameters and a gas-liquid contact device provided therewith. <P>SOLUTION: An air bubble generation device 10 is used by being contacted with liquid (Liq) and includes a flexible resin sheet 20, a first perforated plate 30 and a second perforated plate 40. A plurality of swinging pieces 22 are dispersed and formed by being cut in the resin sheet 20. The first perforated plate 30 is provided with a plurality of large diameter parts 32 larger than the outer diameter of the swinging pieces 22. The second perforated plate 40 is provided with a plurality of small diameter parts 42 smaller than the outer diameter of the swinging pieces 22 and holds the resin sheet 20 together with the first perforated plate 30. The air bubble generation device 10 makes gas (Air), which flows in from the small diameter parts 42 and flows out from the large diameter parts 32 by energizing the swinging pieces 22, into bubbles. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bubble generator and a gas-liquid contact device including the same.

  With regard to this type of technology, Patent Document 1 describes an air cleaning system for treating pollutants contained in air. In this system, air containing pollutants, which are retained in the circulation path, is bubbled from the air diffusing pipe by the operation of the air pump and supplied to the water tank. The air diffuser is a porous body that is supplied with air rectified by a check valve and disperses the air into bubbles.

  Patent Document 2 describes an air environment purification system that removes air pollutants by passing outside air through wash water in an air supply path that guides outside air into the room. In this system, as a cleaning means, a bubble generating unit is used that converts the outside air into microbubbles having a diameter of 0.01 to 0.05 mm and passes them through washing water.

JP-A-2005-230280 JP 2006-205036 A

However, in the air diffuser of Patent Document 1, it is difficult to make the diameter of the bubble bubbled uniform.
Moreover, in the cleaning means of patent document 2, since outside air (gas) is changed into microbubbles of 0.1 mm or less, the pressure loss (pressure loss) in a bubble generation part is large, and it is difficult to obtain sufficient processing flow rate of gas. It is. Further, in order to compensate for such pressure loss, a dedicated air pump is required at the bubble generating portion, which causes a problem that running costs are required.

  Here, in the gas-liquid contact device, it is required to improve both the gas-liquid contact efficiency and the gas processing flow rate. In general, when the bubble diameter is reduced to improve the gas-liquid contact efficiency, the pressure loss of the gas increases, and the processing flow rate per unit time decreases.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a bubble generator that can change a passing gas into bubbles having a desired uniform diameter, and a gas-liquid contact device including the bubble generator. .

  The bubble generator of the present invention is a bubble generator that is used in contact with a liquid, and includes a flexible resin sheet in which a plurality of swing pieces are dispersed and cut and an outer diameter of the swing piece. A first perforated plate having a plurality of larger large-diameter ports and a second perforated plate having a plurality of small-diameter ports smaller than the outer diameter of the swing piece and sandwiching the resin sheet together with the first perforated plate And flows in from the small-diameter port, energizes the swing piece, and bubbles the gas flowing out from the large-diameter port.

  The gas-liquid contact device of the present invention is a gas-liquid contact device that includes the bubble generator described above, and that contacts a plurality of liquid layers provided in multiple stages and the gas that has been bubbled. The gas that has been bubbled and has flowed out of the large-diameter port is further in contact with the liquid layer disposed in contact with the downstream side of the third porous plate.

  Note that the various components of the present invention do not have to be individually independent, that a plurality of components are formed as one member, and one component is formed of a plurality of members. It may be that a certain component is a part of another component, a part of a certain component overlaps a part of another component, and the like.

  According to the bubble generator of the present invention, the swing piece of the resin sheet is individually provided in the gas flow path that passes from the small diameter port to the large diameter port. And the displacement of the rocking | fluctuation piece urged | biased by gas is not impaired by a perforated plate by making the large diameter opening | mouth side into the outflow side of gas. For this reason, the pressure of gas is adjusted for every flow path by the flexibility of a resin sheet, and the bubble of a uniform diameter generate | occur | produces. In addition, the gas-liquid contact device including the bubble generator of the present invention can optimize the gas-liquid contact efficiency and the gas processing flow rate in a balanced manner because the gas in contact with the liquid can be changed to bubbles having a desired uniform diameter. be able to.

(A) is a front view which shows typically the gas-liquid contact apparatus concerning embodiment of this invention, (b) is the right view. (A) is a fragmentary perspective view of a bubble generator, (b) is a fragmentary sectional view which shows the use condition of a bubble generator. It is a partial notch top view concerning the modification of a bubble generator. (A)-(c) is operation | movement explanatory drawing of the gas-liquid contact apparatus of this embodiment. It is explanatory drawing which shows the modification of an exhaust_gas | exhaustion process part typically.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.
In the present embodiment, description will be made by defining the front-rear, left-right, up-down directions as shown. However, this is provided for convenience in order to simply explain the relative relationship of the components, and does not limit the direction during the manufacture or use of the product implementing the present invention.
Hereinafter, the gas-liquid contact device of the present embodiment will exemplarily describe a blow-up type that allows gas to pass upward from the vertically downward direction to the bubble generator installed substantially horizontally, but the present invention is limited to this. Absent. For example, the gas passage direction may be a blow-down type from the upper side to the lower side, or the gas may be passed in the horizontal direction with respect to the standing bubble generator.

Fig.1 (a) is a front view which shows typically the gas-liquid contact apparatus 100 concerning embodiment of this invention, The same figure (b) is the right view. In each figure of FIG. 1, the inside of the gas-liquid contact apparatus 100 is illustrated for the sake of explanation, with a part of the housing 90 not shown.
FIG. 2A is a partial perspective view of the bubble generator 10, and FIG. 2B is a partial cross-sectional view showing a use state of the bubble generator 10.

  First, the outline | summary of the bubble generator 10 and the gas-liquid contact apparatus 100 of this embodiment is demonstrated.

The bubble generator 10 is used in contact with the liquid Liq (see FIG. 2). The bubble generator 10 of this embodiment includes a flexible resin sheet 20, a first perforated plate 30, and a second perforated plate 40.
In the resin sheet 20, a plurality of swing pieces 22 are dispersed and cut.
The first porous plate 30 includes a plurality of large-diameter ports 32 that are larger than the outer diameter of the swing piece 22.
The second porous plate 40 includes a plurality of small-diameter ports 42 smaller than the outer diameter of the swing piece 22, and sandwiches the resin sheet 20 together with the first porous plate 30.
The bubble generator 10 flows in from the small diameter port 42, energizes the swing piece 22, and bubbles the air Air flowing out from the large diameter port 32.

The gas-liquid contact device 100 includes the bubble generator 10 described above, and is a device that brings a plurality of liquid layers L1 and L2 provided in multiple stages into contact with the bubbled gas Air.
In the gas-liquid contact device 100 of the present embodiment, the gas Air that has been bubbled by the bubble generator 10 and has flowed out of the large-diameter port 32 is disposed in contact with the downstream side of the third porous plate 50. Further contact with layer L2.

  Next, the bubble generator 10 and the gas-liquid contact device 100 of this embodiment will be described in detail.

The first perforated plate 30 and the second perforated plate 40 constituting the bubble generator 10 form a large number of openings (large diameter port 32, small diameter port 42) in a metal plate material such as stainless steel (SUS) or aluminum. It is a thing. The type of the first perforated plate 30 and the second perforated plate 40 is not particularly limited, and may be, for example, a punching plate in which a large number of openings are formed by punching or laser processing, or a mesh member braided with a wire. Good.
The first perforated plate 30 and the second perforated plate 40 may be common to each other except for the diameter of the opening, or may have different types and thickness dimensions.

  The resin sheet 20 is made of a resin sheet or film material having a film thickness of 50 μm to 500 μm. Examples of the resin material include polyolefin, specifically, polypropylene. In the present embodiment, a sheet and a film are not distinguished.

  In the bubble generator 10 shown in FIG. 2A, the large-diameter ports 32 (and the small-diameter ports 42 not shown) are arranged in a square lattice pattern. However, as a modification of the bubble generator 10, as shown in FIG. 3, the large-diameter ports 32 and the small-diameter ports 42 may be arranged in a staggered manner.

FIG. 3 is a partially cutaway plan view of the bubble generator 10. The figure is a plan view of the bubble generator 10 formed by laminating the first porous plate 30, the resin sheet 20, and the second porous plate 40 as viewed from the first porous plate 30 side. For the sake of explanation, in FIG. 3, the first perforated plate 30 is hatched, and a part of the first porous plate 30 is cut away to expose the swing piece 22 of the resin sheet 20.
The bubble generator 10 of FIG. 3 is the same as that of FIG. 2 except that the swing piece 22, the large diameter port 32, and the small diameter port 42 are arranged in a staggered manner.

  The swing piece 22 has a substantially circular shape, and the large diameter port 32, the small diameter port 42, and the swing piece 22 are arranged concentrically.

  Each swing piece 22 includes an arc portion 24 and a skirt portion 26, and its outer shape is Ω-shaped. That is, the swing piece 22 is formed by cutting the resin sheet 20 into a Ω shape.

The arc portion 24 is a portion that is exposed from the large-diameter opening 32 and is oscillated by being biased by gas. The arc portion 24 of the present embodiment has a length that is at least one half of the circumference, preferably at least three quarters.
The skirt portion 26 is a portion that connects the arc portion 24 to the resin sheet 20 so as to be swingable. The skirt portion 26 has a divergent shape, and widens both ends of the arc portion 24.

  Here, the swing piece 22 being substantially circular includes a circular shape 24 and a circular shape close to a perfect circle, or a non-circular shape approximated to a perfect circle.

The large diameter port 32, the small diameter port 42, and the swing piece 22 being concentric means that at least some of them overlap each other in the plan view direction of the bubble generator 10.
In the bubble generator 10 of the present embodiment, in the plan view shown in FIG. 3, the large diameter port 32 includes the arc portion 24 of the swing piece 22, and the arc portion 24 includes the small diameter port 42.

  The diameter of the arc portion 24 is preferably 5 to 10 mm. The interval between the adjacent rocking pieces 22 is preferably 10 to 30 mm. The diameter of the large diameter port 32 is preferably 1 to 10 mm larger than the diameter of the arc portion 24, and the diameter of the small diameter port 42 is preferably 1 to 4 mm smaller than the diameter of the arc portion 24.

  The skirt portion 26 is a portion of the swing piece 22 that is sandwiched between the first porous plate 30 and the second porous plate 40. That is, the oscillating piece 22 has the skirt portion 26 sandwiched between the first perforated plate 30 and the second perforated plate 40, and the arc portion 24 can swing. In addition, since the skirt portion 26 is sandwiched between the first perforated plate 30 and the second perforated plate 40, no tearing force is generated at the terminal portion 28 of the skirt portion 26 when the arc portion 24 is swung. . However, the end portion 28 may be rounded into a circular hole to prevent the skirt portion 26 from being stretched.

  The swing piece 22 of the resin sheet 20 is a check valve configured to be freely displaced toward the large diameter port 32 while being restricted from being displaced toward the small diameter port 42.

  As shown in FIG. 2B, the arc portion 24 is restricted from being displaced downward by the second perforated plate 40.

  The bubble generator 10 is used by being immersed in the liquid Liq or by bringing the first porous plate 30 into contact with the interface of the liquid Liq. In the present embodiment, as shown in FIG. 2B, the bubble generator 10 is provided below the liquid Liq, and the first porous plate 30 is in contact with the lower interface of the liquid Liq.

  In this state, the gas Air is bubbled by blowing the gas Air from the small diameter port 42 of the second porous plate 40. Here, the arc portion 24 of the rocking piece 22 is pushed up toward the first porous plate 30 and protrudes from the large diameter port 32 when the gas Air passes. Then, the elastic reaction force of the resin sheet 20 and the weight of the liquid Liq are loaded on the passing air Air. Thereby, the passage amount of the gas Air is limited, and bubbles are finely formed. That is, when the gas Air passes, the circular arc portion 24 continuously swings to divide the gas Air and bubble it.

  In the bubble generator 10 of this embodiment, by adjusting the flow rate of the gas Air, the film thickness of the resin sheet 20, the diameter of the arc portion 24, and the amount of the liquid Liq, bubbles having a diameter of about 5 to 30 mm are formed. It is formed.

Returning to FIG. 1, the gas-liquid contact device 100 of this embodiment will be described.
The gas-liquid contact device 100 makes the gas Air bubbled by the bubble generator 10 contact the liquid layers L1 and L2 (liquid Liq) arranged in multiple stages, and the components contained in the gas Air are liquid layer L1. , An apparatus for removing by dissolving in L2.

  The casing 90 of the gas-liquid contact device 100 has a box shape, the front side (the left side in FIG. 1B) is a pipe accommodating portion 92, and the depth side (the right side in the same figure) is the bubble generator 10. It is a gas-liquid contact portion 94 that is installed to make the gas Air bubble and gas-liquid contact.

The gas-liquid contact portion 94 has a vertical two-chamber structure.
The lower chamber 95 is a chamber for bringing the gas Air flowing in from the lower cavity 74 into gas-liquid contact with the liquid layer L1. In the lower chamber 95, the bubble generator 10 is provided at the lowermost portion corresponding to the inflow portion of the gas Air, and the liquid layer L1 is stored in the upper portion thereof. A gas layer G2 exists above the liquid layer L1.
The liquid layer L1 stored in the lower chamber 95 is supported downward by the swing piece 22 (check valve: see FIG. 2) of the bubble generator 10 and does not fall into the lower cavity 74.

  The upper chamber 96 is a chamber in which the gas Air that has been in gas-liquid contact with the lower chamber 95 is further in gas-liquid contact with the liquid layer L2. In the upper chamber 96, a third porous plate 50 is provided at the lowermost portion corresponding to the inflow portion of the gas Air, and the liquid layer L2 is stored in the upper portion. A gas layer G3 exists above the liquid layer L2.

  The third porous plate 50 is a member that introduces the gas Air that has passed through the liquid layer L1 into the upper chamber 96 and supports the liquid layer L2 downward. The bubble generator 10 and the third perforated plate 50 are installed facing each other substantially in parallel.

The third porous plate 50 is a plate-like member having a large number of openings, and a punching plate or a mesh member can be used similarly to the first porous plate 30 and the second porous plate 40.
That is, a check valve is not provided in the opening of the third porous plate 50, and the gas Air and the liquid layer L2 can pass in both directions.

  Wheels 98 are attached to the lower part of the housing 90, and the bubble generator 10 can be transferred.

  The present embodiment is a blow-up type gas-liquid contact device 100 that causes the gas Air to flow upward from below in the gas-liquid contact portion 94.

The gas-liquid contact device 100 includes an air supply path 70 that continuously supplies the gas Air, and a blower (exhaust blower 75) that pumps the gas Air to the air supply path 70 at a predetermined exhaust pressure. Yes.
The intake port 71 of the air supply path 70 may optionally include a filter (not shown) for removing dust in the gas Air. As such a filter, a nonwoven fabric filter made of a resin material such as PET (Polyethylene Terephthalate) or polypropylene can be used.

The exhaust blower 75 centrifugally accelerates the gas Air through the annular flow path 72. In the air supply path 70, a descending path 73 and a lower cavity 74 are provided on the downstream side of the annular channel 72 in this order.
The lower cavity 74 is provided in contact with the second perforated plate 40 (see FIG. 2) on the lower surface side of the bubble generator 10.

  That is, the liquid layer L1 is provided in contact with the downstream side (upper part) of the bubble generator 10, and the gas layer G1 is provided on the upstream side (lower part).

  Then, as shown in FIG. 2 (b), the pushing force based on the exhaust pressure of the exhaust blower 75 is applied to the gas Air that has reached the lower cavity 74 of the second perforated plate 40 that hits the lower surface side of the bubble generator 10. Of these, the load is concentrated on the small diameter opening 42. For this reason, the exhaust pressure and running cost of the exhaust blower 75 required for the gas Air to pass through the gas-liquid contact portion 94 can be suppressed.

  Both the bubble generator 10 and the third perforated plate 50 are arranged substantially horizontally. The individual horizontalities of the bubble generator 10 and the third porous plate 50 are not particularly limited, and may be installed in the gas-liquid contact portion 94 with different horizontalities.

  A gas layer G <b> 2 exists on the lower side of the third porous plate 50. When the bubbles generated by the bubble generator 10 rise from the liquid layer L <b> 1, they become bubbles in which the gas Air is contained in the liquid film, or the bubbles are repelled to become the gas Air and reach the third porous plate 50. The gas Air is bubbled again by the third porous plate 50 and comes into contact with the liquid layer L2.

  Here, by continuously blowing up the gas Air by the exhaust blower 75, the foamed liquid layer L1 rises to the upper chamber 96 and becomes the liquid layer L2, and the liquid layer L2 falls to the lower chamber 95. The speed of returning to the liquid layer L1 is balanced. Thus, even if the third porous plate 50 does not have a check valve, a predetermined amount of the liquid layer L2 is always stored in the upper chamber 96. Then, by stopping the exhaust blower 75, the liquid layer L2 falls from the third porous plate 50 and becomes the liquid layer L1. The third porous plate 50 is closely attached to the inner wall of the upper chamber 96, and the liquid layer L2 does not leak from the periphery of the third porous plate 50 into the lower chamber 95.

  The bubble generator 10 according to the present embodiment forms a liquid layer L2 on the third porous plate 50 by separating a part of the liquid layer L1 stored in the lower chamber 95 by blowing up the gas Air by the exhaust blower 75. In this way, the gas Air absorption liquid is multistaged. Thereby, since each layer of the liquid layers L1 and L2 is thin, the pressure loss of the passing air Air is reduced while maintaining high gas-liquid contact efficiency.

Although the component of gas Air is not specifically limited, The gas Air of this embodiment shall contain a volatile organic compound (VOC).
The gas-liquid contact device 100 further includes a cooling device 76 that cools the liquid layer L1. For example, a liquid immersion type piezo element is used for the cooling device 76.

Thereby, the VOC contained in the gas Air is not only dissolved in the liquid layer L1, but also cooled and aggregated in the liquid layer L1, and further removed from the gas Air.
For this reason, the gas-liquid contact apparatus 100 of this embodiment can remove VOC in the gas Air with high efficiency.

  As shown in FIG. 1, the bubble generator 10 further includes a supply path 80 that supplies the liquid layer L <b> 1 to the top of the bubble generator 10.

The supply path 80 is provided with an on-off valve 81 and a pressure feed pump 82.
The supply path 80 communicates the lower cavity 74 of the air supply path 70 and the upper part of the bubble generator 10 in the gas-liquid contact portion 94. Then, the liquid Liq stored in the lower cavity 74 is discharged from the coating liquid port 83 through the supply path 80, and the liquid Liq is supplied to the upper part of the bubble generator 10 as the liquid layer L1. The height position of the coating liquid port 83 is not particularly limited, and may be above the third porous plate 50 or between the bubble generator 10 and the third porous plate 50.

  The gas-liquid contact device 100 further includes a fourth porous plate 60 between the bubble generator 10 and the third porous plate 50. That is, the fourth perforated plate 60 is installed at an intermediate height of the lower chamber 95.

  The fourth porous plate 60 has a variable distance D1 (see FIG. 4C) from the bubble generator 10. The amount by which the liquid layer L1 supplied to the upper part of the bubble generator 10 moves to the upper part of the third porous plate 50 together with the gas Air is adjusted to increase or decrease by changing the interval D1.

  The lower chamber 95 is provided with a pair of adjusting portions 62 for adjusting the fourth porous plate 60 to move up and down. The adjustment unit 62 includes a wire that suspends the fourth porous plate 60 and a wheel shaft that winds the wire. The fourth porous plate 60 is suspended at the four corners by wires, and by adjusting the winding amount of the pair of adjusting portions 62, the fourth porous plate 60 is supported horizontally or at an arbitrary angle. It can be tilted and adjusted up and down.

On the other hand, at the intermediate height of the upper chamber 96, a fifth porous plate 64 is installed above the third porous plate 50.
Similarly to the lower chamber 95, the upper chamber 96 is also provided with a pair of adjustment portions 66 for adjusting the fifth porous plate 64 up and down. The adjustment unit 66 includes a wire that suspends the fifth porous plate 64 and a wheel shaft that winds up the wire. By adjusting the winding amount, the fifth porous plate 64 is raised and lowered at an arbitrary installation angle. Can be adjusted.

  The fourth perforated plate 60 and the fifth perforated plate 64 are members that capture bubbles rising from the liquid layers L <b> 1 and L <b> 2, liquefy them and drop them, and punch the same as the third perforated plate 50. A plate or a mesh member can be used. The aperture ratio of the fourth porous plate 60 and the fifth porous plate 64 is 10 to 40%, preferably 20 to 30%.

  The fourth perforated plate 60 and the fifth perforated plate 64 are suspended in a non-contact manner with respect to the inner wall surface of the lower chamber 95 or the upper chamber 96, respectively. It flows down from the periphery of the five perforated plates 64. For this reason, the liquid layers L1 and L2 do not form other liquid layers on the fourth porous plate 60 and the fifth porous plate 64.

  Here, when the fourth porous plate 60 is lowered to reduce the distance from the liquid surface of the liquid layer L1, the undulation of the liquid surface of the liquid layer L1 collides with the fourth porous plate 60, and the liquid layer L1 Convection speed is improved and gas-liquid contact efficiency is improved. For this reason, it is particularly effective when the viscosity of the liquid layer L1 is relatively high (for example, about 100 cPs).

  On the other hand, when the fourth porous plate 60 is raised to increase the distance from the liquid surface of the liquid layer L1, the undulation of the liquid surface of the liquid layer L1 is reduced from colliding with the fourth porous plate 60, and the liquid layer The convection speed of L1 is suppressed. When the viscosity of the liquid layer L1 is relatively low (for example, in the case of 10 cPs or less), it is effective to raise the fourth porous plate 60 to suppress the liquid surface undulation of the liquid layer L1.

  At this time, the amount of the liquid layer L1 that moves to the third porous plate 50 using the fourth porous plate 60 as a foothold is also reduced. For this reason, by increasing the distance D1 between the fourth porous plate 60 and the bubble generator 10, the amount of the liquid layer L2 rising from the liquid layer L1 to the upper chamber 96 decreases, and conversely, the distance D1 is decreased. As a result, the amount of the liquid layer L2 increases.

  The lower chamber 95 and the upper chamber 96 are provided with observation windows 67 and 68, respectively. Thereby, the liquid amount of the liquid layers L1 and L2 can be visually observed. The observation windows 67 and 68 are formed at positions including both the liquid surfaces of the liquid layers L1 and L2 and the fourth and fifth porous plates 60 and 64.

  The gas-liquid contact device 100 further includes a collection unit 85 that collects the liquid layer L2 that has flowed out downstream of the third porous plate 50, and a collection channel 86 that collects the collected liquid layer L2. Prepare. Specifically, an exhaust processing unit 110 is provided on the downstream side of the upper chamber 96. The exhaust processing unit 110 has an introduction path 84 into which a gas Air containing bubbles of the liquid layer L2 that has passed without being collected by the fifth porous plate 64 is introduced, and a collection system installed downstream of the introduction path 84. Part 85 and an exhaust port 88 for releasing the air Air that has passed through the collection part 85 into the atmosphere. The exhaust processing unit 110 is installed on the top of the housing 90.

  Thereby, the foam of the liquid layer L2 which has passed through the fifth porous plate 64 can be collected by the collecting unit 85 and reused as the liquid layer L2 or the liquid layer L1. A filter made of a metal plate such as SUS or aluminum can be used for the collection unit 85. More specifically, a screen device that collides and separates bubbles by changing the airflow direction in multiple stages using a bent metal plate may be used as the collection unit 85.

By providing the collection part 85 and the collection | recovery flow path 86, even if it operates the gas-liquid contact apparatus 100 continuously, it can suppress that the liquid layers L1 and L2 reduce.
Here, the liquid layers L1 and L2 of the present embodiment are VOC adsorbents composed of an aqueous solution in which a solute having a specific gravity higher than that of water is dissolved. Examples of the solute include an epoxy-based polymer.
At this time, by providing the collection part 85 above the gas-liquid contact part 94, even if the foam of the liquid layer L2 passes through the collection part 85 and reaches the exhaust port 88, the component of the foam The water with the lower specific gravity is dominant. For this reason, even if the liquid amounts of the liquid layers L1 and L2 are gradually reduced by the continuous operation of the gas-liquid contact device 100, the liquid layers L1 and L2 can maintain the concentration and the liquid amount only by replenishing water.

FIGS. 4A to 4C are operation explanatory views of the gas-liquid contact device 100 of the present embodiment.
FIG. 4A shows the initial state. In the initial state, the liquid Liq introduced into the gas-liquid contact portion 94 from the inlet (not shown) is stored in the lower cavity 74 of the air supply path 70.
The liquid Liq is stored in the lower cavity 74 and the lower part of the lower chamber 95, and the bubble generator 10 is immersed in the liquid Liq.

  Here, the liquid Liq is pumped through the supply path 80 by opening the on-off valve 81 and driving the pressure feed pump 82. Then, the liquid Liq discharged from the coating liquid port 83 into the upper chamber 96 flows down the third porous plate 50 and falls into the lower chamber 95 and is accumulated on the upper part of the bubble generator 10. In the bubble generator 10, the swing piece 22 (see FIG. 2) functions as a check valve, and the liquid Liq discharged from the coating liquid port 83 is held in the lower chamber 95.

  FIG. 7B shows a state when the exhaust blower 75 starts operating. At this time, the liquid Liq is completely discharged from the lower cavity 74 and accumulated in the lower chamber 95. By operating the exhaust blower 75, the gas Air contained in the VOC is introduced into the air supply path 70 and further reaches the lower cavity 74.

FIG. 3C shows the state of the gas-liquid contact device 100 during stable operation. A part of the foamed liquid layer L1 passes through the third porous plate 50 together with the gas Air, and is liquefied to form the liquid layer L2. In the liquid layer L2, the speed at which the liquid layer L2 drops from the third porous plate 50 and the speed at which new foam is added to the liquid layer L2 are balanced.
The gas Air makes gas-liquid contact twice in the liquid layer L1 of the lower chamber 95 and the liquid layer L2 of the upper chamber 96, and the VOC component is dissolved and removed.

  Note that the pressure feed pump 82 may be driven during the stable operation of FIG. As a result, the slight liquid layer L1 that has fallen into the lower cavity 74 can be transported to the coating liquid port 83 and reused as the liquid layers L1 and L2.

  FIG. 5 is an explanatory diagram schematically showing a modified example of the exhaust processing unit 110.

  The collection part 85 introduces the introduction path 84 for introducing the gas (splash-containing gas IN: thick arrow) containing the droplet DR of the liquid layer L2 that has flowed out to the downstream side of the third porous plate 50; An air flow generation unit 850 that blows a reverse wind (splash prevention reverse wind HW: thin arrow) against the gas Air (splash-containing gas IN) to separate the droplet DR and the gas Air.

  The airflow generation unit 850 is a means for generating the splash-preventing reverse wind HW and decelerating the droplet-containing gas IN. The splash-preventing reverse wind HW may be supplied from the outside of the gas-liquid contact device 100, or the gas inside the gas-liquid contact device 100 (cavity portion 857) may be circulated as in this modification.

  The air flow generation unit 850 of the present modification includes a blower (circulation blower 851) that circulates gas inside the collection unit 85 to generate a reverse wind (splash prevention reverse wind HW), and an opening that is larger in diameter than the introduction path 84. And a spray port 854 for the splash-preventing reverse wind HW, which is disposed to face the mochi introduction path 84.

  More specifically, the airflow generation unit 850 includes a circulation path 852 in which a circulation blower 851 is installed, an expansion section 853 in which the circulation path 852 expands in a tapered shape, and a spray port provided at the tip of the expansion section 853. 854 and a filter 855 for removing the splash DR from the gas introduced into the circulation blower 851.

  The introduction path 84 of this modification has a smaller diameter than the upper chamber 96 and converges the droplet-containing gas IN and introduces it into the cavity 857. The introduction path 84 includes a tapered portion that continuously decreases in diameter from the upper chamber 96 and a straight portion that extends to the tip of the tapered portion.

  The droplet-containing gas IN is a two-phase mixed gas of the gas Air from which the VOC has been removed and the droplet DR of the liquid layer L2. By spraying the splash-preventing reverse wind HW from the front against the droplet-containing gas IN, the droplet DR having a larger inertial force than the gas Air is remarkably decelerated, and the gas Air and the droplet DR are separated from each other. A part of the separated droplet DR falls from the introduction path 84 into the upper chamber 96. The other droplets DR are separated from the gas Air outside the introduction channel 84, collected in the liquid collection unit 856, and further sent to the coating liquid port 83 (see FIG. 1) through the collection channel 86a.

  The liquid collection part 856 is an annular liquid storage groove provided around the outside of the introduction path 84. The liquid collection part 856 of this modification is an area sandwiched between the outer peripheral surface of the introduction path 84 and the inner surface of the cavity part 857, and a recovery flow path (spray drain) 86a communicates with one or more of its bottom face. Is provided.

  The droplet-containing gas IN from which the droplets DR are separated and removed becomes exhaust EX (white arrow) and is discharged from the exhaust port 88. The droplet-containing gas IN remaining without the droplets DR being separated is mixed with the splash-preventing headwind HW and introduced into the circulation path 852. The droplets DR are separated from the droplet-containing gas IN by the filter 855. The droplets DR separated here are sent to the coating liquid port 83 (see FIG. 1) through the recovery channel 86b. A filter 855 can be a mesh demister.

  As described above, in the exhaust processing unit 110 according to the present modification, the droplet DR is separated from the droplet-containing gas IN by the liquid collection unit 856 and the filter 855, and again becomes the liquid layers L1 and L2 from the coating liquid port 83. It is supplied to the contact portion 94. Here, the opening end surface of the introduction path 84 through which the droplet-containing gas IN is introduced into the cavity portion 857 and the opening end surface of the spraying port 854 are substantially concentric and on the same plane, and the opening end surface of the spraying port 854 is open. Encloses the opening end face of the introduction path 84. Thereby, the splash prevention reverse wind HW is sprayed from the front with respect to the droplet containing gas IN, and the droplet containing gas IN (splash DR) is decelerated.

  However, the opening end surface of the introduction path 84 may be located inside the spray port 854, and the introduction path 84 and the spray port 854 may be arranged in a bowl shape. Thereby, the droplet-containing gas IN and the splash-preventing head wind HW collide with each other with certainty.

  The opening diameter of the blowing port 854 is preferably a ratio (hereinafter referred to as an opening ratio) of not less than 2 times and not more than 3 times the opening diameter of the introduction path 84. By setting the opening ratio to be twice or more, since the splash-preventing headwind HW is blown to the introduced droplet-containing gas IN without omission, the droplet-containing gas IN may reach the exhaust port 88 while containing the droplet DR. Is prevented. In addition, by setting the opening ratio to 3 times or less, the splash-preventing headwind HW is not excessively diffused, and the splash-containing gas IN is pushed back along the outer periphery of the introduction path 84 and is substantially within the cavity portion 857. An N-shaped airflow is formed. Thereby, the droplets DR are suitably removed from the droplet-containing gas IN and collected in the liquid collection unit 856.

  The flow ratio of the circulation blower 851 to the exhaust blower 75 (see FIG. 1) is not particularly limited, but may exceed 100%. That is, the flow rate of the splash-preventing reverse wind HW generated by the circulation blower 851 may be larger than the flow rate of the gas Air supplied from the intake port 71 by the exhaust blower 75. Thereby, the droplet DR can be suitably separated from the droplet-containing gas IN.

(Example)
An example of the operation result of the gas-liquid contact device 100 described in the above embodiment shown in FIG. 1 is shown below.
Gas Air in which methyl ethyl ketone (MEK) heated to 50 ° C. was mixed with air at a temperature of 22 ° C. at a concentration shown in Table 1 below was introduced into the gas-liquid contactor 100 by the exhaust blower 75 at a flow rate of 50 m ³ / min. This gas Air was continuously passed through the aqueous liquid Liq to perform a MEK removal test.
The set temperature of the cooling device 76 installed in the lower chamber 95 was 3 ° C. The atmospheric temperature of the gas-liquid contact device 100 was 27 ° C., and the temperature of the liquid Liq at the start of the test was stabilized at 26 ° C. (normal temperature).

  Moreover, the bubble generator 10 shown in FIG. 3 was used, the interval between adjacent rocking pieces 22 was set to 20 mm, and the diameter of the arc portion 24 was set to 6 mm.

  Table 1 below shows the results of the VOC removal test.

  From the results shown in Table 1, the VOC concentration discharged from the exhaust port 88 is 1000 ppm or less, and the absorption rate is as high as 85% or more, with respect to the high-concentration gas Air in which the VOC concentration on the inlet side at the intake port 71 exceeds 7500 ppm. VOC was removed. In addition, the absorption rate exceeded 85% within 5 minutes from the start of operation, and the VOC absorption operation by the gas-liquid contact device 100 was stabilized. And even if it continued for 1.5 hours, the absorption rate of VOC maintained 85% or more. During this time, liquid Liq was not replenished.

  Moreover, when the continuous test over 1 week was done, the absorption rate of VOC maintained 85% or more. During this time, only the water was replenished with respect to the decrease in the liquid Liq.

  Furthermore, even when the VOC introduced into the intake port 71 was changed to toluene and ethyl acetate, respectively, an absorption rate of 85% or more was achieved as in Table 1.

  From the above, it was revealed that the gas-liquid contact efficiency by the gas-liquid contact device 100 and the high VOC absorption rate were high.

DESCRIPTION OF SYMBOLS 10 Bubble generator 20 Resin sheet 22 Oscillating piece 24 Arc part 26 Bottom part 28 Termination part 30 First porous plate 32 Large diameter opening 40 Second porous plate 42 Small diameter opening 50 Third porous plate 60 Fourth porous Plate 64 Fifth porous plate 62, 66 Adjusting section 67, 68 Observation window 70 Air supply path 71 Air inlet 72 Annular flow path 73 Lowering path 74 Lower cavity 75 Exhaust blower 76 Cooling device 80 Supply path 81 On-off valve 82 Pressure feed pump 83 Coating port 84 Introduction channel 85 Collection unit 850 Airflow generation unit 851 Circulation blower 852 Circulation channel 853 Expansion unit 854 Spray port 855 Filter 856 Liquid collection unit 857 Cavity 86, 86a, 86b Recovery channel 88 Exhaust port 90 Housing 92 Piping accommodating portion 94 Gas-liquid contact portion 95 Lower chamber 96 Upper chamber 98 Wheel 100 Gas-liquid contact device 110 Exhaust treatment portion Air Gas DR Splash EX Exhaust HW Fly Prevention headwind IN splash-containing gas Liq liquid G1, G2, G3 gas layer L1, L2 liquid layer

Claims (11)

A bubble generator used in contact with a liquid,
A flexible resin sheet in which a plurality of swing pieces are dispersed and cut, and
A first perforated plate having a plurality of large-diameter openings larger than the outer diameter of the swing piece;
A plurality of small-diameter openings smaller than the outer diameter of the swing piece, and having a second perforated plate sandwiching the resin sheet together with the first perforated plate,
A bubble generator for bubbling gas flowing in from the small diameter port and energizing the swing piece to flow out of the large diameter port.   2. The bubble generator according to claim 1, wherein the swing piece is a check valve configured to be freely displaced toward the large-diameter port while being restricted from being displaced toward the small-diameter port.   The bubble generator according to claim 1 or 2, wherein the swing piece has a substantially circular shape, and the large-diameter port, the small-diameter port, and the swing piece are arranged concentrically. A gas-liquid contact device comprising the bubble generator according to any one of claims 1 to 3, wherein a plurality of liquid layers provided in multiple stages and a bubbled gas are brought into contact with each other.
The gas-liquid contactor characterized in that the gas that has been bubbled by the bubble generator and flows out of the large-diameter port further contacts the liquid layer disposed in contact with the downstream side of the third porous plate.   The gas-liquid contact device according to claim 4, wherein the liquid layer is provided in contact with the downstream side of the bubble generator and a gas layer is provided on the upstream side. Both the bubble generator and the third perforated plate are arranged substantially horizontally, and is a blow-up type gas-liquid contact device that allows the gas to flow from below to above,
The gas-liquid contact device according to claim 4 or 5, further comprising a supply path for supplying the liquid layer to an upper portion of the bubble generator. Further comprising a fourth porous plate between the bubble generator and the third porous plate;
The distance between the fourth porous plate and the bubble generator is variable, and the amount of the liquid layer supplied to the upper part of the bubble generator moves to the upper part of the third porous plate together with the gas The gas-liquid contact device according to claim 6, wherein the increase / decrease adjustment is performed by changing the interval.   The collection part which collects the said liquid layer which flowed out to the downstream of said 3rd perforated plate, and the collection | recovery flow path which collect | recovers the collected said liquid layers are further provided in any one of Claim 4 to 7 The gas-liquid contact apparatus described in 1.   The collection part introduces a gas containing the droplets of the liquid layer that has flowed out to the downstream side of the third perforated plate, and the splashes are blown against the introduced splashes and the gas by blowing back air. The gas-liquid contact apparatus of Claim 8 containing the airflow generation part which isolate | separates and the said gas.   The air flow generation unit circulates the gas inside the collection unit to generate the back wind, and the back wind blowing port that has an opening larger in diameter than the introduction path and is opposed to the introduction path And the gas-liquid contact device according to claim 9. A cooling device for cooling the liquid layer;
The gas-liquid contact device according to any one of claims 4 to 10, wherein the gas contains a volatile organic compound.

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