JP2008006432A - Method and apparatus for dissolving and mixing gas and liquid using linear slit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method which enables the more efficient dissolution and mixture of gas and liquid. <P>SOLUTION: The method for dissolving and mixing gas and liquid is characterized in that a vapor phase is dissolved in a liquid phase by simultaneously passing the vapor phase and the liquid phase through the linear slit provided on (1) a metal sheet, (2) a plastic sheet or (3) a molded product of the metal sheet or the plastic sheet. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus for mixing and dissolving a gas phase in a liquid phase.

Conventionally, as a general method for mixing and dissolving a gas phase in a liquid phase, a bubbling method using a porous filter, a gas phase is sucked into a vortex that swirls the liquid phase and becomes a negative pressure, and gas is introduced into the liquid phase. A method of crushing and mixing phases is employed. Moreover, as a method of performing gas-liquid mixing using a slit, for example, there is a fine bubble generator as in Patent Document 1. The slit structure described in Patent Document 1 is a structure in which a certain distance is formed by bringing protrusions into contact with the tube body of the liquid flow path, and gas is mixed when liquid flows in the tube body. However, it is gas-liquid mixed.
JP 2006-61829 A

  However, in the means for generating fine bubbles during gas-liquid mixing, the slit-type fine bubble generating device described in Patent Document 1 needs to adjust the width of the interval for forming the slits in units of μm. In addition, due to the structure of the device, it is very difficult to diffuse fine bubbles at the slit of the gas-liquid supply port that opens on the circumference of one place, and the efficiency of gas-liquid mixing is high in practical mass production. It is considered bad.

  Accordingly, a main object of the present invention is to provide a method capable of performing gas-liquid mixing and dissolution more efficiently.

  As a result of intensive studies in view of the problems of the prior art, the present inventor has found that the above object can be achieved by allowing gas-liquid to pass through a specific structure, and has completed the present invention.

That is, the present invention relates to the following gas-liquid mixing and dissolving method and gas-liquid mixing and dissolving apparatus.
1. 1) A metal sheet, 2) a plastic sheet, or 3) a gas phase and a liquid phase are simultaneously passed through linear slits provided in a molded product of the metal sheet or plastic sheet, thereby dissolving the gas phase in the liquid phase. A gas-liquid mixed dissolution method characterized by
2. Item 2. The gas-liquid mixed dissolution method according to Item 1, wherein the gap between the linear slits is 0 to 0.5 mm.
3. Item 3. The gas-liquid mixed dissolution method according to Item 1 or 2, wherein the linear slit is provided intermittently.
4). The molded product is a cylindrical body in which a metal sheet or a plastic sheet is formed into a cylindrical shape, and a gas phase and a liquid are put into a linear slit from the inside of the cylindrical body toward the outside or from the outside toward the inside. Item 4. The gas-liquid mixed dissolution method according to any one of Items 1 to 3, wherein the phase is passed.
5. An apparatus for dissolving a gas phase in a liquid phase,
(1) Liquid phase supply means for supplying a liquid phase,
(2) a gas phase supply means for supplying a gas phase;
(3) 1) metal sheet, 2) plastic sheet, or 3) metal sheet or plastic provided with linear slits for passing the gas phase and liquid phase supplied from the gas phase supply means and liquid phase supply means A gas-liquid mixing / dissolving apparatus including gas-liquid mixing / dissolving means having a molded sheet.
6). Gas-liquid mixing dissolution means
1) As the molded product, a pipe formed of a fluororesin sheet is used.
2) The sheet thickness is 0.1 to 2 mm,
3) The gap between the linear slits is 0 to 0.5 mm,
4) One opening of the pipe is closed,
5) The gas-liquid mixing and dissolving device according to 5 above, wherein a fixing bracket is provided on the inner periphery and / or outer periphery of the other opening of the pipe.
7). A gas-liquid mixing / dissolving means is further provided on the suction side of the pump, and the supplied gas phase and liquid phase are passed through the linear slit by the suction pressure in the liquid phase. Item 7. The gas-liquid mixing and dissolving device according to Item 5 or 6, which dissolves the gas phase.
8). As a classifying means for selecting and classifying a large particle size bubble contained in a liquid that has passed through a gas-liquid mixing and dissolving means, a) a grid-like linear slit screen having an aperture of 0.1 to 0.5 mm Or b) The gas-liquid mixing and dissolving device according to any one of Items 5 to 7, further comprising a horizontal stripe-shaped linear slit wedge wire screen having an aperture of 0.1 to 0.5 mm.
9. The gas-liquid mixing and dissolving apparatus according to claim 8, further comprising a recycling unit that selectively classifies the bubbles and does not pass through the screen and returns the bubbles having a large particle diameter to the gas-liquid mixing and dissolving unit on the pump suction side.
10. Item 10. The gas-liquid mixing and dissolving device according to any one of Items 5 to 9, further including means for applying ultrasonic vibration to the solution on the outlet side of the gas-liquid mixing and dissolving unit to refine the bubbles.
11. Items 5 to 10 above, further comprising means for pressurizing a mixture containing bubbles having a large particle size through a gas-liquid mixing and dissolving means within a range of 0.02 MPa to 0.4 MPa to refine the bubbles in the mixture. The gas-liquid mixing and dissolving apparatus according to any one of the above.
12 A gas-liquid mixing and dissolving means is disposed on the outer peripheral surface of the impeller of the pump, and the gas phase and the liquid phase sucked into the pump are passed through the linear slit by the centrifugal force of the impeller. Item 8. The gas-liquid mixing and dissolving device according to Item 5 to 7, wherein the gas phase is dissolved in the liquid phase.

  According to the gas-liquid mixed dissolution method according to the present invention, the gas phase and the liquid phase are passed through the linear slits (wire slits), whereby the gas phase can be efficiently dissolved in the liquid phase.

  In addition, if the metal sheet or plastic sheet having a linear slit is a tomographic film that is stacked in multiple layers with a spacer in between, the outermost or innermost linear slit is used to allow gas-liquid to permeate externally or internally. The mixture that has passed through the gas-liquid mixture passes through the linear slits of the next layer, and is further gas-liquid mixed. It becomes possible to mix and dissolve in the gas phase. Here, even if dust or the like that causes clogging is mixed in the conventional filter such as impurities or a linear slit having a gap width in the liquid phase, the linear slit according to the present invention may cause clogging problems. In addition, it is possible to obtain a gas-liquid mixed solution that is compact but sufficiently secures practical production.

-Gas-liquid mixing and dissolution method The gas-liquid mixing and dissolution method of the present invention comprises 1) a metal sheet, 2) a plastic sheet or 3) a gas phase and a liquid phase in a linear slit provided in a molded product of the metal sheet or plastic sheet. The gas phase is dissolved in the liquid phase by passing them simultaneously.

  The liquid phase (solvent) applicable to the present invention is not limited, and examples thereof include water and alcohols. Further, the gas phase may be any one that is soluble in the applied solvent, and can be appropriately selected from oxygen, ozone, carbon dioxide gas, and the like.

  In the method of the present invention, 1) a metal sheet, 2) a plastic sheet, or 3) a liquid slit and a gas phase are simultaneously passed through a linear slit provided in a molded product of the metal sheet or plastic sheet, and the liquid is cut and refined. The gas phase is dissolved in the phase.

  The material of the metal sheet or plastic sheet for forming the linear slit is not particularly limited. Various metals or alloys can be used as the metal, and more specifically, iron, steel, stainless steel, etc. can be mentioned. Examples of the plastic include a fluorine resin, a polyester resin, an acrylic resin, and the like. In the present invention, a fluororesin is particularly preferable in terms of corrosion resistance, strength, and the like. In particular, polytetrafluoroethylene can be suitably used.

  These molded products may be in any form as long as the gas phase and the liquid phase can be passed through the linear slit. Examples of the shape include a flat shape (as it is), a cylindrical shape (pipe shape), a spherical shape, and the like. In particular, a cylindrical shape is preferable in that it is easy to pressurize the gas phase and the liquid phase.

  The thickness of the sheet may be any thickness as long as the valve function-like action described later can be exhibited, and can be appropriately set within a range of about 0.1 to 3 mm depending on the physical properties (particularly flexibility) of the sheet to be used. it can. For example, when a fluororesin (particularly polytetrafluoroethylene) is used as the sheet, the sheet thickness may be determined within a range of about 0.1 to 2 mm, preferably 0.1 to 1.5 mm.

  The shape and number of the linear slits can be appropriately set according to, for example, the material of the linear slits, the types of the gas phase and the liquid phase, the target concentration, and the like. Various shapes as shown in FIG. 1 can be adopted as the shape of the linear slit. As a method for forming the linear slit, for example, a method of cutting a metal sheet or a plastic sheet with a cutter or the like can be employed. That is, as shown in FIG. 1, it is desirable to perform a process of making a cut through the sheet without cutting a sheet piece from a metal sheet or a plastic sheet. By adopting a linear slit (linear through slit) formed by cutting a metal sheet or a plastic sheet so as to penetrate, the gas phase can be efficiently dissolved in the liquid phase.

  The gap between the linear slits is not limited, but in general, the gap is preferably about 0 to 0.5 mm. When the gap is 0 mm, there is no gap when no pressure is applied (when the gas phase and the liquid phase are not pressurized), but the gap is temporarily generated due to the flexibility of the sheet when the pressure is applied. The gas phase and liquid phase can be passed. Therefore, the present invention includes a linear slit with a gap of 0 mm.

  In the present invention, the reason why the gas phase can be efficiently dissolved in the liquid phase by passing through the linear slit is considered as follows. In other words, the liquid phase and gas phase do not pass through the linear slit when not pressurized, but the action of repeating the passage and blocking of the gas phase and liquid phase due to the flexibility and elasticity of the sheet when pressurized (valve function-like action) ) Occurs in the linear slit, and in the course of the repeated action, the gas phase is considered to be finely cut (sheared) by the linear slit and dissolved in the liquid phase.

  In addition, the sheet may be a single layer, but two or more layers may be laminated and used. When two or more layers are used, the dissolved concentration of the gas phase can be increased more efficiently. When the structure has two or more layers, it is desirable to provide a space in each layer using a spacer 4 as shown in FIG. 5 or FIG.

  The gas phase and the liquid phase may be passed through a linear slit after both are mixed in advance. In the case where the sheet is formed in a cylindrical shape and the gas phase and the liquid phase are allowed to pass from the inside of the cylinder to the outside (in the case of the internal pressure type), both can be separately introduced into the inside of the cylinder.

  When supplying the gas phase and the liquid phase to the linear slit, it is desirable to apply sufficient pressure to pass through the linear slit. The pressure can be appropriately set within a range of 0.01 to 2 MPa according to the material (physical properties) of the sheet to be used. For example, when using a fluororesin (especially polytetrafluoroethylene) as a sheet | seat, it can set suitably within the range of a pressurization pressure about 0.01-1.0 MPa. Moreover, when utilizing the suction pressure of a pump, it can set suitably in the range of atmospheric pressure-about 0.02 MPa. For pressurization, for example, a known or commercially available pump, cylinder, compressor or the like may be used.

2. Gas-liquid mixing and dissolving apparatus The gas-liquid mixing and dissolving apparatus of the present invention is an apparatus for dissolving a gas phase in a liquid phase,
(1) Liquid phase supply means for supplying a liquid phase,
(2) a gas phase supply means for supplying a gas phase;
(3) 1) metal sheet, 2) plastic sheet, or 3) metal sheet or plastic provided with linear slits for passing the gas phase and liquid phase supplied from the gas phase supply means and liquid phase supply means A gas-liquid mixing / dissolving means including a molded product of the sheet is included.

  As the liquid phase supply means, a container (liquid phase chamber) for storing the liquid phase is used. The container is connected to gas-liquid mixing means through liquid phase piping. The liquid phase piping may be arranged so as to merge with the gas phase piping before the gas-liquid mixing and dissolving means.

  As the gas phase supply means, a container (gas phase chamber) for storing the gas phase is used. The container is connected to gas-liquid mixing means through gas-phase piping. The gas-phase piping may be arranged so as to merge with the liquid-phase piping before the gas-liquid mixing and dissolving means.

  In addition, as the liquid phase chamber and the gas phase chamber, known or commercially available cylinders, tanks, and the like can be used.

  The gas-liquid mixing and dissolving means is provided with 1) metal sheet, 2) plastic sheet, or 3) provided with linear slits for passing the gas phase and liquid phase supplied from the gas phase supply means and liquid phase supply means. A molded product of a metal sheet or a plastic sheet is provided. As long as it has such a configuration, its form is not particularly limited. For example, a cylindrical body formed by forming the sheet into a cylindrical shape is used as the molded product, and the cylindrical body is disposed in a container that can accommodate a part or the whole of the cylindrical body. A device partitioned by a cylindrical body inside and outside the cylindrical body can be employed as the gas-liquid mixing and dissolving means. In this case, a method of passing the linear slit from the inside of the cylindrical body toward the outside of the cylindrical body (internal pressure type), a method of passing the linear slit from the outside of the cylindrical body toward the inside of the cylindrical body (external pressure type) Either may be sufficient. In the present invention, the external pressure type is particularly desirable.

  Further, the gas-liquid mixing and dissolving means can be not only one stage but also a multi-stage type having two or more stages. For example, by passing the liquid obtained through the first gas-liquid mixing and dissolving means through the second gas-liquid mixing and dissolving means, the dissolved concentration of the gas phase in the liquid can be further increased.

  Furthermore, gas-liquid mixing and dissolving means is disposed on the outer peripheral surface of the impeller of the pump, and the particle size is reduced by passing the gas phase and liquid phase sucked into the pump through the linear slit by the impeller centrifugal force, By introducing it into the next gas-liquid mixing and dissolving means, the dissolved concentration of the gas phase in the liquid can be further increased.

  In the gas-liquid mixing and dissolving means, the material of the metal sheet or plastic sheet, the shape of the linear slit, etc. may be the same as in the gas-liquid mixing and dissolving method.

  The apparatus of the present invention preferably includes a pressurizing device for press-fitting the gas phase and liquid phase or a mixture thereof into the linear slit. Moreover, when utilizing the suction pressure of a pump, it can set suitably in the range of atmospheric pressure-about 0.02 MPa. As the pressurizing device, for example, a cylinder or the like can be adopted in addition to known devices such as a pump and a compressor.

  Further, it may include means for applying ultrasonic vibration to the solution on the outlet side of the gas-liquid mixing and dissolving means to refine the bubbles. Thereby, it is possible to move the dissolved solution that has passed through the gas-liquid mixing and dissolving means in combination with the gas-liquid mixing and dissolving means to the nanobubble region, thereby further increasing the dissolved concentration of the gas phase in the liquid. As a device for applying ultrasonic vibration, a known ultrasonic vibration device can be employed.

  Furthermore, in the present invention, there may be included means for further pressurizing the mixture containing bubbles having a large particle diameter that has passed through the gas-liquid mixing and dissolving means to refine bubbles (bubbles) in the liquid phase. Thereby, the large particle diameter bubble contained in the liquid which passed through the gas-liquid mixing and dissolving means can be dissolved in the liquid phase, and thereby the dissolved concentration of the gas phase in the liquid can be further increased. In this case as well, a known device such as a pump or a compressor can be employed as the pressurizing device.

  Next, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
FIG. 1 is a plan view showing examples of various linear slit patterns formed on a sheet according to the present invention, and FIG. 2 is a perspective view showing an embodiment of a sheet provided with linear slits according to the present invention. 3 is a perspective view showing a film (slit film) in which the sheet of FIG. 2 is formed in a disc shape and linear slits are provided intermittently, and FIG. 4 shows a state in which the slit films of FIG. 3 are closely spaced. FIG. 5 is a perspective view showing a roll-shaped slit film in which the sheet of FIG. 2 is wound, FIG. 6 is a cross-sectional view taken along the arrow A in FIG. 5, and FIG. FIG. 8 is a configuration diagram schematically showing a gas-liquid mixing apparatus according to the present invention.

  As shown in FIGS. 1 (a) to 1 (j), the shape of a very narrow linear slit 1 (valve structure slit) formed in a metal sheet or plastic sheet 2 with almost no gap includes a straight slit and a cross slit. Benz cut slits, semi-arc slits, etc. can be applied. The gas phase and the liquid phase are simultaneously passed through the linear slit 1 so that the gas phase and the liquid phase are refined, gas-liquid mixing is performed, and the gas phase can be dissolved in the liquid phase. That is, when a certain pressure is applied to the sheet 2, the linear slit 1 acts as a valve to repeatedly pass and block the gas phase and the liquid phase, and the gas phase and the liquid phase are refined and finally the liquid phase. The gas phase is dissolved. Further, for example, when dust or the like causing clogging is mixed in the liquid phase and passes through the linear slit 1, even if it accumulates at the inlet and causes clogging, passing pressure due to clogging is applied. As a result, the operation of repeatedly passing and blocking the gas phase and the liquid phase is exhibited as a valve, the clogging is eliminated, and the normal linear slit state is restored. Therefore, it is preferable that the physical properties of the selected metal or plastic 2 have strength, elasticity and the like that can exhibit the action of repeatedly passing and blocking the gas phase and the liquid phase as the valve.

  Further, the metal sheet or plastic sheet 2 having the linear slits 1 shown in FIG. 2 is installed with the disk-like slit films 2 arranged intermittently at constant or irregular intervals as shown in FIG. 3 or FIG. In particular, the gas phase and the liquid phase are refined by passing through the linear slit 1, and gas-liquid mixing and dissolution can be performed efficiently. Further, the metal sheet or plastic sheet 2 having the linear slit 1 shown in FIG. 2 is formed as a tomographic membrane 3 wound in a roll shape with a spacer 4 interposed therebetween as shown in FIGS. By passing the gas-liquid phase in the direction of the arrow 5) or the internal pressure type (passage direction arrow 6), the gas-liquid phase that has passed through the linear slit 1 in the outermost layer or the innermost layer and mixed is gas-liquid phase. It is possible to efficiently increase the gas phase concentration in the liquid phase by passing through the linear slit 1 and further gas-liquid mixing and gradually passing through the linear slit 1 provided in each sheet layer. By passing through all the sheet layers, the gas phase and the liquid phase are refined, and the high-concentration gas phase can be dissolved in the liquid phase. Further, as shown in FIG. 7, the metal sheet or plastic sheet 2 may be formed into a plurality of pipes having different inner diameters, and the tomographic film 3 may be polymerized at intervals.

  According to the present invention, it is considered that the gas phase and the liquid phase are allowed to pass through the slit film simultaneously, thereby exhibiting the action of repeatedly passing and blocking the gas phase and the liquid phase as a valve. Gas-liquid mixing can be performed efficiently in a short time with low energy without causing clogging of the linear slit. It should be noted that the passage of the gas phase and the liquid phase at the same time may mean that the mixture of both passes, and is not limited to the meaning that they pass simultaneously strictly in time.

<Embodiment 2>
In the gas-liquid mixing and dissolving apparatus of the present invention, the gas-liquid mixing means is 1) a pipe formed of a fluororesin sheet provided with linear slits, and 2) one opening of the pipe is closed. 3) It is preferable that fixing brackets are provided on the inner periphery and the outer periphery of one opening of the pipe. By adopting the above configuration, gas-liquid mixing and dissolution can be efficiently performed with low energy.

  As shown in FIG. 9, a valve structure slit film 91 of a fluororesin pipe is used as the slit film of the present invention, and stainless steel fittings are provided on the inner and outer peripheral surfaces of the inlet side end of the slit film 91. 92 and 93 are attached, and the end portion 91a which is the tip of the slit film 91 is sealed, so that the internal pressure type or the external pressure type can be used. Such a slit film can be used for either an internal pressure type or an external pressure type, and it is easy to mount metal fittings 92 and 93 suitable for various containers on the end surface of the slit film 91. Liquid mixing dissolution is possible. In addition, it can be used in applications where corrosion resistance is required by a combination of fluororesin and stainless steel.

<Embodiment 3>
The apparatus of the present invention further comprises a pump, and a gas-liquid mixing and dissolving means is disposed on the suction side of the pump, and the gas phase and the liquid phase supplied to the linear slit are passed by the suction pressure. It can also be adopted. According to this configuration, since the suction effect of the ejector or the like is not used, the pressure loss can be minimized as much as possible, and the effect of not reducing the pump performance can be obtained. The supplied low-pressure gas and atmospheric pressure gas and liquid can be mixed and dissolved in the gas-liquid mixture by passing through the slit film using the suction pressure of the pump.

  As shown in FIG. 10, on the suction side of the pump 804, a slit film 101 made of a fluororesin pipe is installed in the storage container 103, and the outlet side and the inlet side of the slit film 101 arranged in the storage container 103 are sealed 102. Then, the liquid phase is introduced, the atmospheric pressure and the pressurized gas are sucked by the suction pressure of the pump 804, and the gas is mixed and dissolved in the liquid phase through the linear slit. The outer shape of the pipe can be 5 mm to 15 mm, and the thickness of the pipe can be 0.3 mm to 1 mm. The material of the metal fitting can be austenitic stainless steel.

<Embodiment 4>
In the apparatus of the present invention, as shown in FIG. 12, gas-liquid mixing and dissolving means is arranged on the impeller of the pump of Embodiment 3, and the gas phase and liquid phase sucked into the pump are separated by linear slits by the impeller centrifugal force. It is also possible to adopt a configuration that allows passage. According to such a configuration, since the centrifugal force of the impeller is used, there is an effect that a pressure source for passing the linear slit is unnecessary. The gas phase and the liquid phase sucked into the pump can be mixed and dissolved in the gas and liquid by passing through the slit film using the centrifugal force of the impeller.

<Embodiment 5>
The apparatus of the present invention preferably further includes a classifying means (screen) for selecting and classifying a large particle size bubble contained in the liquid that has passed through the gas-liquid mixing and dissolving means. After gas-liquid mixture dissolution, large-sized microbubbles (bubbles with micron order particle size) are selected and separated upwards with a wedge wire screen, and gas-liquid mixture dissolution is performed through piping through an automatic gas vent valve. It is returned to the means and the gas-liquid mixture is dissolved again. Small particle size microbubbles can be passed through the wedge wire screen along with the liquid.

  In this case, it is preferable to further include a recycling means for returning the large particle size bubbles that do not pass through the screen to the gas-liquid mixing and dissolving means. Thereby, solution production of nanobubbles (bubbles having a nano-order particle size) can be stably performed by selecting and separating microbubbles having a large particle size. Since the gas that has been diffused from the liquid with the microbubbles up to now can be recycled into nanobubbles, the amount of gas used can be reduced.

  When generating nanobubbles by gas-liquid mixed dissolution, it contains a lot of large-sized microbubbles and escapes in the liquid due to rapid rise, so it is a gas that does not contribute to nanobubbles and is a loss gas without dissolving . The object is to provide a method and apparatus for separating large-sized microbubbles that become lossy.

  As shown in FIG. 11, after the gas-liquid mixture is dissolved, gas separation in which a metal wedge wire screen 111 having openings for selecting and separating microbubbles having a large particle size in the separation container 112 is installed on the entire vertical surface. Install a recycling device, attach the wedge wire screen 111 with the horizontal opening, install an automatic degassing valve at the top of the vertical upper surface, return to the gas-liquid mixing and dissolving means, and dissolve again with gas-liquid mixing it can. The opening of the wedge wire screen 112 can be 0.1 mm to 0.5 mm. As the material, austenitic stainless steel can be preferably used.

<Embodiment 6>
The apparatus of the present invention preferably further includes an ultrasonic vibration device for transferring the solution to the nanobubble solution. An ultrasonic vibration device may be disposed on the outlet side of the gas-liquid mixing and dissolving means, and a means for applying ultrasonic vibration to the solution on the outlet side to refine the bubbles may be included. Thereby, the solution through the gas-liquid mixing and dissolving means can be transferred to the nanobubble region.

  In a situation where it is difficult to dissolve a gas in a liquid in the nanobubble region, a method and an apparatus for transferring the gas to the nanobubble region in combination with a gas-liquid mixed dissolution means are provided.

  As shown in FIG. 8, when the liquid generated by the gas-liquid mixing and dissolving means of the present invention contains large-sized microbubbles, an ultrasonic vibration device is disposed on the outlet side of the gas-liquid mixing and dissolving means, By applying ultrasonic vibration to the solution on the outlet side, the solution can be transferred to the nanobubble solution in the nanobubble region to increase the solubility of the gas. A known device can be used as the ultrasonic vibration device.

<Embodiment 7>
It is preferable that the apparatus of the present invention further includes a pressurizing device for transferring the solution to the nanobubble solution. By further pressurizing the solution through the gas-liquid mixing and dissolving means, bubbles contained in the solution can be further transferred to the nanobubble region.

  Method and apparatus for transferring a solution containing a large number of microbubbles and a solution containing a large number of nanobubbles to the nanobubble region in a situation where it is difficult to dissolve the gas in the solution in the nanobubble region Is to provide.

  As shown in FIG. 8, when the liquid produced by the apparatus of the present invention contains microbubbles having a large particle size, the liquid is pressurized in a sealed container 810 to be transferred to a nanobubble solution in a nanobubble region. Gas solubility can be increased. The pressurizing pressure is preferably in the range of 0.02 MPa to 0.4 MPa. The pressurized container 810 may be used in combination with a container that stores the gas-liquid mixing and dissolving means. As the material of the container, for example, austenitic stainless steel can be used.

  EXAMPLES Hereinafter, an Example is shown and this invention is demonstrated more concretely. However, the scope of the present invention is not limited to the examples.

Example 1
The slice film 3 shown in FIG. 7 was used as a slit film, which was housed in a stainless steel module and subjected to a gas-liquid mixed dissolution test.

  As shown in FIG. 8, gas-liquid mixing is performed from the liquid-phase chamber 7 and the gas-phase chamber 8 by means of a device that passes through the slit membrane module 10 and the slit membrane module 11 at the same time by the pump 9 while passing air and liquid simultaneously. Dissolution was performed. The slit membrane modules 11 and 12 used in this test example are made of Teflon (registered trademark) with a pipe outer diameter of 35 mm and a length of 250 mm, 14 rows in the longitudinal direction, and 30 Benz-cut linear shapes in a row. A pipe-like sheet membrane 2 provided with a total of 420 slits 1, and a Teflon (registered trademark) inner side made of Teflon (registered trademark) and a pipe outer diameter of 25 mm and a length of 250 mm, 10 rows in the longitudinal direction and 30 rows in a row. A tomographic membrane 3 comprising a pipe-like sheet membrane 2 provided with a total of 300 Benzcut linear slits 1 was used. And the distilled liquid was used for the liquid phase of gas-liquid mixing, and oxygen was used for the gaseous phase, and the gas-liquid mixed solution 12 was obtained. The dissolved oxygen concentration in this liquid was measured over time. The results are shown in Table 1. Table 2 shows the characteristics of Teflon (registered trademark) (fluororesin: tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA)) used for the slit film.

  As shown in Table 1, the dissolved oxygen saturation concentration in water at a water temperature of 11 ° C. before mixing is about 10 mg / L, whereas if the gas-liquid mixed dissolution method of the present invention is used, dissolved oxygen in water in a short time. It can be seen that the concentration can be increased above the saturation concentration. That is, according to the present invention, gas-liquid mixing can be efficiently performed in a short time with low energy, and there is no worry of clogging failure of the slit film 3, and the gas phase is contained in a large amount of liquid phase while being compact. This is effective as a means for mixing and dissolving, and by piping as a slit membrane module in the liquid phase flow path, the running cost is low even at the actual production level, and a practical gas-liquid mixed solution can be obtained.

Example 2 (Embodiment 2)
Example 2-1
As shown in FIG. 9, the slit film 91 made of a Teflon (registered trademark) pipe is used to fix and seal the inlet side, and the gas-liquid mixed solution is introduced to the open side to thereby form the slit film 91. It was possible to produce a gas solution in the nanobubble region by passing it through. The outer shape of the pipe made of Teflon (registered trademark) was 5 mm to 15 mm, and the wall thickness of the pipe was 0.3 mm to 1 mm. The material of the metal fitting was austenitic stainless steel.

Example 2-2
As shown in FIG. 8, after the gas-liquid mixing and dissolving device 803 on the suction side of the pump 804 is mixed, the microbubble and nanobubble solution is passed through the slit film 805 of claim 6 on the discharge side of the pump 804. Then, the microbubbles having a large particle size are selected and separated by the separation / recycling device 806, and returned to the gas-liquid mixing / dissolution device 803 on the suction side of the pump 804 via the automatic air vent valve 809 and mixed again. The solution that passed through the separation / recycling device 806 was allowed to pass through the slit film 807 to obtain a solution 811 in the nanobubble region.

Example 2-3
As shown in FIG. 12, the gas phase and liquid phase sucked into the pump are passed through the gas-liquid mixing and dissolving device 122 on the outer peripheral surface of the impeller 121 and discharged from the pump discharge side to obtain microbubble and nanobubble solution. did it.

Example 3 (Embodiment 3)
As shown in FIG. 8, gas-liquid mixing and dissolving means using a Teflon (registered trademark) pipe is installed as the slit film 803 on the suction side of the pump 804, and the outlet and inlet sides of the container containing the slit film 803 are installed. A slit membrane 803 made of Teflon (registered trademark) pipe is fixed and sealed 102 to introduce the liquid, and the atmospheric pressure or pressurized gas is sucked through the slit membrane 803 by the suction pressure of the pump and mixed and dissolved in the liquid phase. I let you. The outer shape of the pipe was 5 mm to 15 mm, and the wall thickness of the pipe was 0.3 mm to 1 mm. The material of the metal fitting was austenitic stainless steel.

Example 4 (Embodiment 4)
As shown in FIG. 11, a metal wedge wire screen 111 having openings is introduced in a horizontal direction by introducing a gas-liquid mixed solution and selecting and separating microbubbles having a large particle size in the separation container 112. Installed. The microbubbles having a large particle size were selectively separated upward and returned to the gas-liquid mixing and dissolving device 3 through a pipe through an automatic gas vent valve 809 and again mixed and dissolved. The small particle size microbubbles were passed through the wedge wire screen 111 together with the gas-liquid mixture. The material of the wedge wire screen 111 and the storage container 112 was austenitic stainless steel.

Example 5 (Embodiment 5)
As shown in FIG. 8, an ultrasonic vibration device 812 is disposed on the outlet side of the gas-liquid mixing and dissolving means 803, 805, and 807, and ultrasonic vibration is applied to the solution on the outlet side of the gas-liquid mixing and dissolving means 803, 805, and 807. By giving, it was made to transfer to a nanobubble solution and the solubility of gas could be raised. A known device can be used as the ultrasonic vibration device.

Example 6 (Embodiment 6)
By pressurizing the microbubble solution 811 containing the microbubbles having a large particle size produced in the apparatus of Example 2-2 in the pressurized container 810, the microbubble solution is transferred to the nanobubble solution in the nanobubble region, and the gas solubility is increased. I was able to raise it. Tap water was used as the liquid phase and oxygen was used as the gas phase. Microbubbles were generated by gas-liquid mixing and became cloudy. The dissolved oxygen concentration immediately after that (when the saturated dissolved oxygen was assumed to be 100%) was 339.1%, but after the inside of the container was pressurized to 0.2 MPa, the pressure was reduced to atmospheric pressure. The dissolved oxygen concentration at that time increased to 573.9%.

  In addition, when the material of the pressurization container 810 needs to be visually observed, a transparent acrylic resin and transparent PVC were used, and when visual inspection was not required, austenitic stainless steel was used.

Example 7
Regarding the oxygen dissolution capacity, the apparatus of Example 2-2 (nano bubble method) was compared with the conventional apparatus. As a conventional apparatus, an ejector type melting apparatus was used. Tap water was used as the liquid phase. The results are shown in Table 3 and FIG.

  In the method of the present invention, the time required to reach the same value as the concentration achieved by the ejector method was about 30 seconds. Therefore, it can be seen that the dissolving ability by the method of the present invention is 21 times at 630 seconds / 30 seconds = 21. This also shows that the amount of oxygen used and the dissolution time can be reduced.

Example 8
When ozone was dissolved in tap water using the apparatus of Example 2-2, the effect of using oxygen or air together was investigated. The results are shown in Table 4 and FIG.

  As is clear from these results, it was possible to obtain ozone-dissolved water having a concentration approximately twice that of the case where air was used together (normal case) by using oxygen together.

Example 9
The time-dependent change of the dissolved oxygen concentration of the oxygen solution manufactured using the apparatus of Example 2-2 was examined. An oxygen solution (dissolved oxygen concentration 56.82 mg / L) was produced in the same manner as in Example 1 except that tap water was used as the liquid phase and oxygen was used as the gas phase. The dissolved oxygen concentration (mg / L) immediately after production was measured. The results are shown in Table 5 and FIG.

  As is apparent from these results, the average rate of decrease in the oxygen concentration of tap water was 3.16 mg / L / day.

Example 10
The difference in the effect with and without the microbubble separation and recycling equipment was investigated. Specifically, the apparatus of Example 2-2 was used, and tap water was used as the liquid phase and oxygen was used as the gas phase. A similar experiment was conducted in Example 2-2 without a microbubble separation and recycling apparatus. These results are shown in FIG.

Example 11
An artificial carbonate bath was prepared according to the present invention. Carbon dioxide gas was dissolved in warm water set to 40 ° C. using the apparatus of Example 2-2 until the pH value reached equilibrium. Thereafter, warm water was collected in a 2 L capacity plastic bottle, and the change in pH was examined. For comparison, carbon dioxide gas was dissolved in the same manner using a commercially available hollow membrane. At this time, in the case of the apparatus of Example 2-2, almost no bubbles were confirmed, whereas in the case of the hollow membrane, continuous generation of bubbles was confirmed. These results are shown in Table 6 and FIG. Further, the concentration of carbon dioxide was measured immediately after the dissolution of carbon dioxide. The results are shown in Table 7.

  As is apparent from these results, it can be seen that the method of the present invention can be suitably employed also in the dissolution of carbon dioxide gas.

  The gas-liquid mixed dissolution method of the present invention is not limited to the type of liquid phase and gas phase, for example, the field of increasing dissolved oxygen in the liquid phase of the food industry, fishery industry, pharmaceutical industry, etc. It can be used for gas-liquid mixing and the like for the purpose of antioxidant by substituting oxygen with nitrogen.

  This apparatus can produce various gases as a solution in the nanobubble region in the liquid, and various supersaturated gas solutions can be produced by using the gas-liquid mixing and dissolving apparatus of the present invention.

  By manufacturing as a solution in the nanobubble region, it can be significantly reduced compared to the amount of gas that produces microbubble solution, and a high-concentration supersaturated gas can be manufactured. Cost reduction due to gas reduction.

  A high-concentration solution of ozone gas can be used for sterilization, deodorization, and decolorization of indoor air, food processing, etc., and spraying the high-concentration solution with fine particles enables ozone sterilization at an acceptable concentration of the Japan Society for Occupational Health.

  High-concentration ozone-dissolved solution can dissolve high-concentration supersaturated oxygen at the same time and has a high dispersion effect, so it is treated by decomposition, sterilization, and decolorization with ozone by a new method of injecting the solution to replace air bubbling for wastewater treatment In addition, the processing capacity can be improved with a large concentration of oxygen supply without significant equipment enhancement. Moreover, the same effect can be expected for purification of ponds and the like, and it can be applied to various purification apparatuses.

  The solution in the nano-bubble region has an activating effect, and can be expected to be applied to agricultural and fishery, stable production of disease-resistant products, etc. by introducing it into agriculture and fishery.

It is a top view which shows the example of the various linear slit pattern formed in the sheet | seat which concerns on this invention. It is a perspective view which shows one Example of the sheet | seat provided with the linear slit which concerns on this invention. It is a perspective view which shows the slit film | membrane which formed the sheet | seat of FIG. 2 in disk shape, and was provided intermittently. FIG. 4 is a perspective view showing a state in which the distance between the slit films in FIG. 3 is close. It is a perspective view which shows the roll-shaped slit film which wound the sheet | seat of FIG. It is sectional drawing which shows A arrow of FIG. It is a perspective view which shows the slit film | membrane which overlap | superposed the sheet | seat of FIG. It is a block diagram which shows typically the gas-liquid mixing dissolution apparatus in this invention. It is sectional drawing of the slit film | membrane of this invention. It is sectional drawing of the slit film | membrane gas-liquid mixing dissolution apparatus by the side of the pump suction of this invention. It is sectional drawing of the microbubble separation-recycling apparatus of this invention. It is sectional drawing of the slit film | membrane gas-liquid mixing dissolution apparatus of the pump impeller of this invention. It is the graph which compared this invention and the oxygen dissolution capability of the existing technology. It is the graph which compared the ozone dissolving ability of oxygen and air of the present invention. It is a graph which shows the dissolved oxygen concentration decreasing tendency of the nano bubble solution manufactured by this invention. It is a graph which compares the particle size (particle size distribution) of the large particle size microbubble separation recycling apparatus of this invention. It is a graph which shows the change of pH by this invention and the artificial membrane bath dissolution of a hollow membrane system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve structure linear slit 2 Metal sheet or plastic sheet 3 Roll-shaped or pipe-shaped tomographic membrane 4 Spacer 5 Permeation direction of gas-liquid mixing (external pressure type)
6 Permeation direction of gas-liquid mixing (internal pressure type)
7 Liquid Phase Chamber 8 Gas Phase Chamber 9 Liquid Feed Pump 10 First Stage Slit Membrane Module 11 Second Stage Slit Membrane Module 12 Gas-Liquid Mixed Solution 801 Liquid Phase Chamber 802 Gas Phase Chamber 803 Gas Liquid Mixture Dissolver 804 Liquid Feed Pump 805 Gas-liquid mixing and dissolving device 806 Large particle size micro bubble separation and recycling device 807 Gas-liquid mixing and dissolving device 808 Check valve 809 Automatic degassing valve 810 Pressurized vessel 811 Nano bubble gas dissolving solution 812 Ultrasonic vibration device 91 PFA pipe slit membrane 91a Pipe end face blind 92 Outer surface stainless steel metal fitting 93 Inner surface stainless steel metal fitting 101 PFA pipe slit membrane 102 Packing 103 Storage container 103a Cover 103b Mounting metal fitting 111 Wedge wire screen 112 Storage container 121 Suction port 122 Outlet port 123 Impeller 124 PFA pipe slit membrane 25 fixed cover

Claims (12)

1) A metal sheet, 2) a plastic sheet, or 3) a gas phase and a liquid phase are simultaneously passed through linear slits provided in a molded product of the metal sheet or plastic sheet, thereby dissolving the gas phase in the liquid phase. A gas-liquid mixed dissolution method characterized by the above. The gas-liquid mixed dissolution method according to claim 1, wherein a gap between the linear slits is 0 to 0.5 mm. The gas-liquid mixed dissolution method according to claim 1 or 2, wherein the linear slits are provided intermittently. The molded product is a cylindrical body in which a metal sheet or a plastic sheet is formed into a cylindrical shape, and a gas phase and a liquid are put into a linear slit from the inside of the cylindrical body toward the outside or from the outside toward the inside. The gas-liquid mixed dissolution method according to any one of claims 1 to 3, wherein a phase is passed. An apparatus for dissolving a gas phase in a liquid phase,
(1) Liquid phase supply means for supplying a liquid phase,
(2) a gas phase supply means for supplying a gas phase;
(3) 1) metal sheet, 2) plastic sheet, or 3) metal sheet or plastic provided with linear slits for passing the gas phase and liquid phase supplied from the gas phase supply means and liquid phase supply means A gas-liquid mixing / dissolving apparatus including gas-liquid mixing / dissolving means having a molded sheet. Gas-liquid mixing dissolution means
1) As the molded product, a pipe formed of a fluororesin sheet is used.
2) The sheet thickness is 0.1 to 2 mm,
3) The gap between the linear slits is 0 to 0.5 mm,
4) One opening of the pipe is closed,
5) The gas-liquid mixing and dissolving apparatus according to claim 5, wherein a fixing metal fitting is provided on an inner periphery and / or an outer periphery of the other opening of the pipe. A gas-liquid mixing / dissolving means is further provided on the suction side of the pump, and the supplied gas phase and liquid phase are passed through the linear slit by the suction pressure in the liquid phase. The gas-liquid mixing dissolution apparatus of Claim 5 or 6 which melt | dissolves a gaseous phase. As a classifying means for selecting and classifying a large particle size bubble contained in a liquid that has passed through a gas-liquid mixing and dissolving means, a) a grid-like linear slit screen having an aperture of 0.1 to 0.5 mm Or b) The gas-liquid mixing and dissolving device according to any one of claims 5 to 7, further comprising a horizontal striped linear slit wedge wire screen having an aperture of 0.1 to 0.5 mm. The gas-liquid mixing and dissolving apparatus according to claim 8, further comprising a recycling unit that selectively classifies the bubbles and does not pass through the screen and returns the bubbles having a large particle diameter to the gas-liquid mixing and dissolving unit on the pump suction side. The gas-liquid mixing and dissolving apparatus according to any one of claims 5 to 9, further comprising means for applying ultrasonic vibration to the solution on the outlet side of the gas-liquid mixing and dissolving means to refine the bubbles. The method further includes means for pressurizing a mixture containing bubbles having a large particle diameter that has passed through the gas-liquid mixing and dissolving means within a range of 0.02 MPa to 0.4 MPa to refine the bubbles in the mixture. The gas-liquid mixing and dissolving apparatus according to any one of the above. A gas-liquid mixing and dissolving means is disposed on the outer peripheral surface of the impeller of the pump, and the gas phase and the liquid phase sucked into the pump are passed through the linear slit by the centrifugal force of the impeller. The gas-liquid mixing and dissolving apparatus according to claim 5, wherein the gas phase is dissolved in the liquid phase.

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