JP6214515B2 - Method for producing gas solution and apparatus for producing gas solution - Google Patents

Description

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

2. Description of the Related Art A gas dissolving device that dissolves gas such as carbon dioxide in a liquid such as water is used. For example, this is the carbon dioxide gas dissolving apparatus described in Patent Document 1. According to this, the diffuser gradually decreases in diameter from the nozzle and the inlet that receives the jet flow from the nozzle, and then gradually increases in diameter toward the outlet, and rotates clockwise around the axial center line in the pipe connected to the diffuser. And a static mixer constituted by alternately arranging 180 ° twisted elements counterclockwise, under a high pressure of about 3 to 5 kg / cm ² and a low temperature of 1 to several ° C., water and carbonic acid. The gas mixture is injected into the diffuser through the nozzle and then mixed in the static mixer, and then retained in the retention tank to equalize the dissolved concentration, thereby making the carbon dioxide gas efficient and constant. By absorbing and dissolving, a liquid in which carbon dioxide gas is dissolved at a constant high concentration can be continuously produced. Such a liquid is suitably used for the production of beer and soft drinks, for example.

Japanese Patent Laid-Open No. 02-212311

  However, in the conventional gas dissolving apparatus as described above, it is necessary to lower the liquid temperature, increase the pressure in the pipe, and lengthen the holding time. As a result, the installation space is required and the cost of introducing the equipment is high. Moreover, since it is necessary to lengthen the washing time, the production time is limited, and the production efficiency cannot be obtained sufficiently.

  The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a compact gas dissolving apparatus capable of dissolving a high concentration gas in a short time.

The present inventors have in view of the background art described above, as a result of various studies on devices capable of dissolving in a short time gas until a fine bubbles of gas has disappeared, the gas-liquid mixing of the liquid and gas body A small diameter hole is provided in the central portion of the cover plate that covers the end face of the cylindrical swirl flow generator that generates a swirl flow by the inflow of the body, and the mixture is placed in a cylindrical container having an inner diameter larger than the small diameter hole When the gas-liquid mixture is jetted from the swirling center of the swirling flow, the jetted mixture becomes a high-speed swirling flow swirling at a rotation speed higher than the rotation speed of the swirling flow, and further finely shears the fine bubbles. When a shearing phenomenon becomes prominent and a swirl flow suppressing plate that suppresses swirling of the high-speed swirling flow is provided in the cylindrical container, the sheared fine bubbles disappear and the gas is suitably converted into a liquid. Clarification of liquid indicating dissolution Can be obtained, the relatively short period of time and for example headings under low pressure of about 0.4 MPa. The present invention has been made based on such knowledge.

That is, the gist of the first invention is (a) a method for producing a gas solution in which a gas is dissolved in a liquid, and (b) a primary swirl by the inflow of the gas and liquid gas-liquid mixture. A primary swirl flow generating step for generating a flow in the swirl flow generator; and (c) a mixture having a smaller diameter than the inner diameter of the swirl flow generator from the swirling center of the swirl flow in the swirl flow generator. By passing through a restrictor having a hole formed therein, a secondary swirling flow swirling at a rotational speed higher than the rotational speed of the swirling flow is injected into a cylindrical container having an inner diameter larger than that of the through hole. A swirl flow generation step, and (d) a step of suppressing swirl flow based on the secondary swirl flow injected into the cylindrical container by a swirl flow suppression plate fixed in the cylindrical container . One end of the swirl flow generator includes the cylindrical container and the restrictor A cylindrical member that is concentrically connected to the other end of the swirling flow generator and is closed by a disc-shaped cover plate, and the cover plate projects toward a through hole formed in the restrictor. It is in providing .

In addition, the gist of the second invention for suitably carrying out the first invention is a gas solution manufacturing apparatus comprising a gas dissolving device for dissolving gas in a liquid, the gas dissolving device comprising: (A) a cylindrical swirling flow generator that generates a primary swirling flow by the inflow of the gas-liquid mixture of gas and liquid, and (b) a through hole smaller than the inner diameter of the swirling flow generator, A secondary (high-speed) swirling flow swirling at a higher rotational speed than the rotational speed of the swirling flow by passing the mixture through the through hole from the swirling center of the swirling flow swirling in the swirling flow generator. (C) a cylindrical container having an inner diameter larger than the through hole of the restrictor and receiving a secondary swirling flow that has passed through the through hole at one end and flowing out from the other end ( d) fixed in the cylindrical container, A swirling flow swirling flow suppressing plate to suppress the brute comprises, (e) the end portion of the swirling flow generator is connected concentrically through the wringer and said tubular container, the swirl flow generation The other end of the device is closed by a disc-shaped cover plate, and (f) the cover plate is provided with a columnar member protruding toward the through hole formed in the restrictor. Features.

According to the gas solution manufacturing method of the first invention and the gas solution manufacturing device of the second invention configured as described above, in the gas dissolving device, the cylindrical swirl is caused by the inflow of the liquid-gas mixture. A primary swirl flow is generated in the flow generator, and the gas-liquid mixture forms a through-hole having a smaller diameter than the inner diameter of the swirl flow generator from the swirling center of the swirl flow swirling in the swirl flow generator. When passed through the throttle , the secondary swirl flow having a smaller diameter and a higher rotation speed than the rotation speed of the primary swirl flow is injected into the cylindrical container and is injected into the cylindrical container. Then, the secondary swirling flow or the swirling flow based on the secondary swirling flow abuts against the swirling flow suppressing plate, and the swirling is suppressed. For this reason, it becomes a secondary swirl flow swirling at a rotation higher than the rotation speed of the primary swirl flow, and fine bubbles are further finely sheared in the gas-liquid mixture. Next, the swirl flow is further sheared by causing the swirl flow restraining plate fixed in the cylindrical container to collide with the second swirl flow or the swirl flow based thereon, and the sheared fine bubbles disappear. Thus, a clear liquid, that is, a gas solution, indicating that the gas is suitably dissolved in the liquid is obtained in a relatively short time and under low pressure. That is, a high-concentration gas can be dissolved in a short time, and a small gas dissolving apparatus can be obtained. One end of the swirling flow generator is concentrically connected via the cylindrical container and the restrictor, and the other end of the swirling flow generator is closed by a disc-shaped cover plate. Since the lid plate is provided with a cylindrical member protruding toward the through hole formed in the restrictor, the volume in the swirling flow generator is reduced by the volume of the cylindrical member. Thus, there is an advantage that the primary swirling flow in the swirling flow generator is rotated at a higher speed.

  Here, preferably, the swirl flow generator has an inflow pipe having an axial center line at a position parallel to a tangential direction of the swirl flow in the swirl flow generator and decentered from the axial center line of the swirl flow generator. And the mixture of liquid and gas is allowed to flow through the inflow pipe. If it does in this way, a swirl flow will be generated in a swirl flow generator by flowing in the mixture of liquid and gas.

  Preferably, the through hole formed in the restrictor is formed to have a smaller diameter from the swirl flow generator side toward the cylindrical container. In this way, it is suitably prevented that turbulent flow is generated in the gas-liquid mixture from the swirl flow generator toward the cylindrical container.

  Preferably, the swirl flow suppressing plate is parallel to a plane including a radial direction and an axial center line direction of the cylindrical container at least at an outer peripheral portion of the cylindrical container and intersects with each other at the axial center line. It has a some baffle plate. In this way, the swirling flow based on the high-speed swirling flow flowing into the cylindrical container abuts on the rectifying plate and the swirling is suppressed, so that the gas is suitably dissolved in the liquid and the axial center line direction The distribution resistance is suppressed as much as possible.

  Preferably, a merging pipe having a first pipe part to which the liquid is supplied, a second pipe part to which the gas is supplied, and a third pipe part to which the gas-liquid mixture is output; A nozzle for injecting the liquid provided in one pipe part, and a diffuser provided in the third pipe part, which gradually decreases in diameter from an inlet for receiving a jet flow from the nozzle and then gradually increases in diameter toward the outlet. And a static mixer configured by alternately arranging clockwise and counterclockwise elements around an axial center line in a pipe connected to the third pipe portion, and The liquid mixture is output from the static mixer. In this case, the gas-liquid mixture is suitably agitated before the supply to the swirl flow generator, the gas is finely divided, the contact area of the gas with the liquid is increased, and dissolution is easy. There is an advantage to become.

  Preferably, the dispersion pump is provided between the static mixer and the swirling flow generator, and pumps the gas-liquid mixture output from the static mixer to the swirling flow generator while applying a shearing force to the gas-liquid mixture. Is further included. In this way, in the stage before being supplied to the swirl flow generator, a shear force is applied to the gas-liquid mixture and it is suitably stirred to further reduce the gas, and the contact area of the gas with the liquid There is an advantage that dissolution is further facilitated. Further, gas can be dissolved even if the gas supply pressure is lowered as compared with the case where no dispersion pump is provided.

It is a figure which illustrates roughly the carbonated water manufacturing apparatus which is an example of the gas solution manufacturing apparatus with which this invention was applied suitably. It is a figure which illustrates roughly the structure of the gas-liquid mixing apparatus of FIG. It is a figure which illustrates roughly the structure of the gas dissolving apparatus of FIG. It is sectional drawing orthogonal to the axial centerline C1 explaining the structure of the swirl | vortex flow generator which comprises some gas dissolving apparatuses of FIG. It is a longitudinal cross-sectional view explaining the structure of the swirl | vortex flow generator shown in FIG. It is a longitudinal cross-sectional view explaining the structure of the other example of the rotational flow generator shown in FIG. It is a longitudinal cross-sectional view explaining the other example of the aperture_diaphragm | restrictor shown in FIG. It is a longitudinal cross-sectional view explaining the structure of the swirl | vortex flow suppression apparatus which comprises some gas dissolving apparatuses of FIG. It is a perspective view explaining the other structural example of the swirl | vortex flow suppression apparatus which comprises some gas dissolving apparatuses of FIG. It is a schematic diagram explaining the gas dissolving effect | action in the gas dissolving apparatus of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a schematic diagram illustrating a carbonated water production apparatus 10 which is an example of a gas solution production apparatus of the present invention. In FIG. 1, a carbonated water production apparatus 10 includes a gas-liquid mixing apparatus 12 that mixes carbon dioxide gas CO2 representing gas G and water W representing liquid L and outputs a gas-liquid mixture GL thereof, A second pump that is connected to the output side of the gas-liquid mixing device 12 and pumps the gas-liquid mixture GL output from the gas-liquid mixing device 12 while applying a shearing force, that is, a dispersion pump 14, and is pumped from the dispersion pump 14. In response to the gas-liquid mixture GL, the primary swirling flow is generated and the secondary swirling flow is generated at a higher speed than the primary swirling flow to generate fine bubbles, and then the high-speed secondary swirling is performed. A gas dissolving device 16 for causing the flow to collide to eliminate fine bubbles, quickly dissolving the carbon dioxide gas CO2 in the gas-liquid mixture GL in the water W, and outputting the carbonated water (gas dissolved solution) CO2W; Output from device 16 Acid water and a buffer tank 18 for temporarily storing the (gas solution) CO2W, has. In the carbonated water production apparatus 10, at least the carbon dioxide gas CO2, water W, gas-liquid mixture GL, and the member in contact with the carbonated water (gas solution) CO2W are made of sanitary stainless steel represented by SUS304 and SUS316L. It is constituted by sanitary piping or parts.

  The gas-liquid mixing device 12 has a carbon dioxide gas CO2 of about 0.8 MPa, for example, via a gas introduction pipe P1 provided with a flow control valve FV1, a flow meter FM1, a thermometer TM1, a pressure gauge PM1, and an electromagnetic on-off valve MV1. The pressure of water W is approximately equal to or less than that of carbon dioxide gas CO2 through the liquid introduction pipe P2 provided with the first pump 13, the pressure gauge PM2, and the thermometer TM2. Supplied in. Further, in a standard state of 1 atm and 0 ° C., the carbon dioxide gas CO 2 is supplied in a volume about 4 to 5 times that of the water W.

  As shown in detail in FIG. 2, the gas-liquid mixing apparatus 12 is connected to the liquid introduction pipe P <b> 2 and supplied with water W to the first pipe portion T <b> 1 and the gas introduction pipe P <b> 1 and supplied with carbon dioxide gas CO <b> 2. A merging pipe T having a second pipe part T2 and a third pipe part T3 from which the gas-liquid mixture GL is output, and a water W provided in the first pipe part T1 of the merging pipe T to the third pipe part T3. An injection nozzle NZ that injects toward the nozzle and a third pipe portion T3 of the junction pipe T. The diameter gradually decreases from the inlet that receives the jet of water W from the nozzle NZ, and then gradually increases toward the outlet. And a plurality of (four pairs in this embodiment) elements ER and EL twisted clockwise and counterclockwise around the axial center line in the diffuser DF and the pipe SMP connected to the third pipe portion T3. Alternatingly and axially about the elements ER and EL And a static mixer SM constructed by arranging linear end edges located at the ends of the two so as to be orthogonal to each other, and gas-liquid mixing of water W and carbon dioxide CO2 in which bubbles are made finer The body GL is output from the static mixer SM. Further, the static mixer SM homogenizes and rectifies the gas-liquid mixture GL, thereby suppressing variations in flow rate.

  The dispersion pump 14 includes, for example, a rotor and a stator having a plurality of serrated protrusions in a pump housing, and a gas-liquid mixture GL that flows by centrifugal force from blades at the center of the rotor has a plurality of serrated protrusions. Is a shear pump that generates mixing and dissolving action by applying a high shearing force and a high impact force due to the occurrence of cavitation to the gas-liquid mixture GL when passing through the gas-liquid mixture GL. For example, Euro Japan Machinery EMP205 manufactured by the company is preferably used. The dispersion pump 14 pumps the gas-liquid mixture GL to the gas dissolving device 16 at a pressure of about 0.4 MPa through the junction pipe P3 having the electromagnetic on-off valve MV2.

  As shown in FIG. 3, the gas dissolving device 16 has an upper end opening (the other end opening) closed in a gas-tight and liquid-tight manner by a disc-shaped lid plate 20a, and a gas-liquid mixture GL pumped from the dispersion pump 14. And a cylindrical swirling flow generator (swivel pipe) 20 that generates a primary swirling flow TF1 in the inside by a tangential direction at a portion away from the axial center line C1, and an inner diameter D1 of the swirling flow generator 20 An injection hole (or a through-hole that functions as a contracted flow nozzle) 22 having a smaller diameter d is formed through the central portion so that the lower end opening (one end opening) of the swirling flow generator 20 is airtight and liquid. The gas-liquid mixture GL is fixed so as to close tightly and passes through the through-hole 22 from the center in the swirling flow generator 20, thereby swirling at a rotational speed higher than the rotational speed of the primary swirling flow TF1. Next (high speed) swirl flow TF And a cylindrical swirl flow generator 20 and a disc-shaped restrictor 24 having an inner diameter D2 larger than the diameter d of the through hole 22 of the restrictor 24. And the constrictor 24 concentrically and airtightly and liquid-tightly with a common axis center line C1 and receiving the secondary (high-speed) swirl flow TF2 passing through the through hole 22 at one end and from the other end The cylindrical container 26 to be discharged and the cylindrical container 26 fixed to the cylindrical container 26 are collided with the secondary (high-speed) swirling flow TF2 or the swirling flow based thereon to eliminate fine bubbles, and the carbon dioxide gas CO2 in the gas-liquid mixture GL. A swirl flow suppressing device 28 that rapidly dissolves water in water W to generate carbonated water (gas dissolved solution) CO2W, and a reverse taper shape in which the flow cross-sectional area gradually changes from the inlet side toward the outlet side. The inlet side is fixed to the swirl flow suppression device 28, and swirl flow And different diameters fitting 34 to be output from the small-diameter outlet side than the inlet side without causing turbulence in carbonated water produced (gas solution) CO2W by the braking device 28, and.

  The swirling flow generator 20, the constrictor 24, the cylindrical container 26, the swirling flow suppressing device 28, and the diameter reducing joint 34 are sealed by a fastening band B shown in FIG. They are fastened to each other via members. In the present embodiment, the swirling flow generator 20 has a sanitary pipe nominal diameter of, for example, 2.5S (inner diameter 59.5 mmφ), and the cylindrical container 26 and the swirling flow suppressing device 28 have, for example, 3.0S. Since the inner diameter is 72.3 mmφ, D2> D1> d.

  FIG. 4 shows a sectional view taken along the line III-III of the cylindrical swirling flow generator 20, and FIG. 5 is a longitudinal sectional view of the swirling flow generator 20 in which the cover plate 20a and the restrictor 24 are fixed to the upper and lower openings. It is. The swirl flow generator 20 is parallel to the tangential direction of the cylindrical outer peripheral wall of the swirl flow generator 20, that is, parallel to the tangential direction of the swirl flow in the swirl flow generator 20 in a plane orthogonal to the axial center line C1. The flow generator 20 has an inflow pipe 20b having an axial center line C2 located eccentrically from the axial center line C1 of the flow generator 20, and the gas-liquid mixture GL pumped from the dispersion pump 14 is introduced through the inflow pipe 20b. Thus, a primary swirl flow TF1 around the axis center line C1 is generated inside. The lid plate 20a is provided with a longitudinal columnar member 20c that protrudes from the center portion of the lid plate 20a toward the through hole 22 formed in the diaphragm 24. The cylindrical member 20c is in a position that does not hinder the rotation of the primary swirling flow TF1 in the swirling flow generator 20, and reduces the volume in the swirling flow generator 20, so that the primary swirling flow TF1 This contributes to speeding up the rotation.

  In FIG. 5, the restrictor 24 has a diameter d (for example, 8A to 15A (10.5 to 17.5 mmφ)) smaller than the inner diameter D1 (for example, 2.5S (59.5 mmφ)) of the swirling flow generator 20. A through-hole 22 is formed through the central portion, and the lower end opening (one end opening) of the swirling flow generator 20 is fixed so as to be airtight and liquid-tightly closed, and the through-hole from the center portion in the swirling flow generator 20 By passing the gas-liquid mixture GL through 22, the secondary (high-speed) swirl flow TF2 swirling at a rotation speed higher than the rotation speed of the primary swirl flow TF1 is injected. Even if the kinetic energy is the same, the turning speed is reduced by reducing the turning diameter, so that a shearing force is further applied to the gas-liquid mixture GL. The through hole 22 is formed so as to have a smaller diameter from the swirl flow generator 22 side toward the cylindrical container 26 side, and a taper TA is provided at the tip of the cylindrical member 20c approached thereto. Is provided. Thereby, generation | occurrence | production of a turbulent flow is prevented as much as possible, reducing the volume in the rotational flow generator 22. FIG.

FIG. 6 shows another example, and the cylindrical member 20c may be thinner (small diameter) as shown in FIG. 5 than that shown in FIG. In order to generate the swirl flow TF1 stably at a high speed, the most effective shape is selected. Further, the diaphragm 24, through holes 22 are formed so as percentage whose diameter increases as the the swirling flow generator 2 0 side toward the cylindrical container 26 side. 7, Ri sectional view showing another example of a diaphragm 24, a smaller diameter inclined is not provided toward the swirling flow generator 2 0 side cylindrical container 26 side in transmural hole 22 .

The cylindrical container 26 has a length that is about two to three times longer than the cylindrical swirling flow generator 20, and a throttle 24 is fixed to the upper end thereof, and a swirling flow suppressing device 28 is disposed on the lower end thereof. It is fixed. For example, as shown in FIG. 8, the swirling flow suppressing device 28 includes a short cylindrical main body 30 and a swirling flow suppressing plate (vortex breaker) 32 fixed to the main body 30 so as to protrude toward the cylindrical container 26. It is configured. The swirl flow suppressing plate 32 is substantially fixed to the cylindrical container 26, and is parallel to a surface including the radial direction of the cylindrical container 26 and the axial center line C1 direction at least in the outer peripheral portion of the cylindrical container 26. And a plurality of rectifying plates 32a and 32b (two in the present embodiment orthogonal to each other) intersecting each other at the axial center line C1. The rectifying plates 32a and 32b have, for example, the same radial dimension w as the inner diameter D2 of the cylindrical container 26 and a height dimension h of about 0.4 to 0.45 times the radial dimension w, for example, 30 mm. In addition, on the main body 30 side of the inner peripheral portion, the height is about 0.2 to 0.225 times, for example, about 15 mm and about 0.55 to 0.6 times, for example, 40 mm with respect to the radial dimension w. A rectangular notch K1 having a radial dimension is formed.

FIG. 9 shows another example of the rectifying plates 32a and 32b. 9 are substantially fixed to the cylindrical container 26, and include at least the outer peripheral portion of the cylindrical container 26 including the radial direction of the cylindrical container 26 and the direction of the axial centerline C1. And a radial dimension w similar to the inner diameter D2 of the cylindrical container 26, and a plurality of rectifying plates (two in the present embodiment orthogonal to each other) intersecting each other at the axial center line C1. 8 is common to FIG. 8, but differs in size and shape. In FIG. 9, the rectifying plate 32a has a height dimension h of about 2.8 to 3.2 times, for example, 200 mm with respect to the radial dimension w, and is 2.2 to 2.2 with respect to the radial dimension w. It is formed in a square frame shape having a rectangular hole K2 having a height and width of about 2.4 times, for example, 160 mm and a radial dimension of about 0.55 to 0.6 times, for example, 40 mm. The rectifying plate 32b has the same height as the upper and lower sides of the rectangular frame-shaped rectifying plate 32a and intersects the upper and lower sides.

  The reduced diameter joint 34 is connected to a large diameter side having a nominal diameter 2.5S or 3.0S for connection to the short cylindrical body 30 of the swirl flow suppressing device 28 and a pipe P4 to the buffer tank 18. For this purpose, the flow cross-sectional area is continuously reduced from the small diameter side having 1.0S or 1.5S, and has a symmetric or asymmetric reverse taper shape around the axial center line C1. In addition, when the swirl | vortex flow suppression apparatus 28 shown in FIG. 8 is used, since the exit side is a small diameter, it is not necessary to use the diameter difference coupling 34. FIG.

  The pipe P4 is sequentially provided with a transparent pipe 36 for observing the gas solution CO2W flowing through the pipe P4, a pressure adjusting valve 38 for adjusting the pressure on the output side to, for example, 0.4 MPa, and a three-way switching valve 40. It has been. The gas solution CO2W output from the gas dissolving device 16 is sent into the buffer tank 18 via the pipe P4 and temporarily stored therein. The pressure adjustment valve 38 adjusts the pressure so that the temperature of the gas solution CO2W becomes higher as the temperature of the gas solution CO2W increases, and the dissolved state of the carbon dioxide gas CO2 in the gas solution CO2W is maintained. The gas solution CO2W in the buffer tank 18 is pumped to a gas solution filling device (not shown) through a pipe P5 having a third pump 42 and a pressure gauge PM5.

  In the carbonated water producing apparatus 10 configured as described above, the dissolving action of the carbon dioxide gas CO2 in the gas dissolving apparatus 16 with respect to the water w will be described below with reference to the schematic diagram of FIG. When the gas-liquid mixture GL in which the carbon dioxide gas CO2 mixed in the water W in the gas-liquid mixing device 12 and the dispersion pump 14 is dispersed and fragmented in advance is pumped to the inflow tube 20b of the gas dissolving device 16, the inflow tube From 20b, as shown in FIG. 4, the gas-liquid mixture GL is parallel to the tangential direction of the cylindrical outer peripheral wall of the swirling flow generator 20 and is eccentric from the axial center line C1 of the swirling flow generator 20 to the outer peripheral side. Therefore, the primary swirl flow TF1 around the axial center line C1 is generated in the cylindrical swirl flow generator 20. This corresponds to the primary swirl flow generation process.

  Next, the gas-liquid mixture GL forming the primary swirl flow TF1 swirling in the swirl flow generator 20 is located at the center of the swirl flow generator 20 and smaller than the inner diameter D1 of the swirl flow generator 20. When passing through the through-hole 22 having the diameter d, a secondary (high-speed) swirl flow TF2 swirling at a rotation speed smaller than that of the primary swirl flow TF1 is injected into the cylindrical container 26. The This corresponds to the secondary swirl flow generation process. Due to the formation of the high-speed secondary swirling flow TF2, the fine bubbles of the carbon dioxide gas CO2 in the gas-liquid mixture GL are further sheared finely.

  A swirl flow restraining plate 32 protruding from a swirl flow restraining device 28 fixed integrally with the tubular container 26 is fixed in the tubular container 26, and the swirl flow based on the secondary swirl flow TF2 or two. The next swirl flow TF2 and / or the swirl flow generated based on the swirl flow is made to collide with the swirl flow suppression plate 32, so that further shearing force is applied to the swirl flow, and the microbubbles disappear due to the shearing force and are transparent. Carbonated water (gas solution) CO2W is obtained. This corresponds to the swirl flow suppressing step. The clearing of the liquid preferably indicates that the carbon dioxide gas CO2 has been dissolved. In this example, the clearing of the liquid can be obtained in a relatively short time and under a low pressure. That is, a high-concentration gas can be dissolved in a short time, and a small gas dissolving apparatus can be obtained.

  Examples of experiments conducted by the present inventors will be described below with reference to Table 1, Table 2, and Table 3. Table 1 shows the production of carbonated water under the same conditions except that the swirl flow suppressing plate has three different shapes in order to evaluate the influence of the shape of the swirl flow suppressing plate (vortex breaker) 32 in the gas dissolving device 16. Dissolved carbon dioxide gas volume (V / V, dissolved carbon dioxide gas / water volume ratio (dissolved carbon dioxide gas quantity / water quantity)) However, the carbon dioxide gas is in a standard state of 0 ° C. and 1 atm. The value in () is evaluated. Test No. 1 in Table 1 1 is the test No. 1 when the swirl flow suppression plate (standard) shown in FIG. 2 shows test No. 2 when the swirl flow suppression plate (medium, h = 200 mm) shown in FIG. 3 is a case where the swirl flow suppression plate (long, h = 300 mm) shown in FIG. 9 is used. In Table 1, “◯” indicates use and “-” indicates non-use. According to the evaluation results in Table 1, with respect to the amount of dissolved carbon dioxide, the test No. 1-No. In Example 3, satisfactory results were obtained. However, as the swirl flow suppressing plate (vortex breaker) 32 becomes longer, the amount of dissolved carbon dioxide gas gradually decreases. It is desirable that the swirl flow suppressing plate has a height of medium (h = 200 mm) or less.

  Table 2 shows the results when carbonated water was produced under the same conditions except that the diameter d of the through hole 22 was four in order to evaluate the influence of the shape of the through hole (constricted flow nozzle) 22 in the gas dissolving device 16. Dissolved carbon dioxide amount (V / V, volume ratio of dissolved carbon dioxide gas and water (dissolved carbon dioxide gas amount / water amount)) However, the carbon dioxide gas amount is 0 ° C. and 1 atm in a standard state. Value) is shown. According to the evaluation results in Table 2, with respect to the dimension of the diameter d of the through hole, the test No. 11-No. In 14 all the results were satisfactory. However, test no. In No. 11, since the pressure loss was high and the feed water flow rate could not reach 6000 L / hr, the production capacity of the carbon dioxide solution was saturated. In addition, Test No. 13 and no. 14, the pressure balance was relatively unstable, and the supply flow rate of carbon dioxide pulsated. In these respects, the diameter d of the through-hole is larger than the nominal diameter 8A (= inner diameter 10.5 mmφ) and larger than the nominal diameter 15A (= inner diameter 17.5 mmφ) with the nominal diameter 10A (= inner diameter 14.0 mmφ) as the center. Is preferably in a small range, for example, 12 mmφ) to 16 mmφ).

  Table 3 shows the production of carbonated water under the same conditions except that the diameter D1 of the swirling flow generator 20 is three in order to evaluate the influence of the shape of the swirling flow generator (swirling pipe) 20 in the gas dissolving device 16. Dissolved carbon dioxide gas volume (V / V, dissolved carbon dioxide gas / water volume ratio (dissolved carbon dioxide gas amount / water amount)) However, the carbon dioxide gas is standard at 0 ° C. and 1 atm. The value in the state) is evaluated. According to the evaluation results in Table 3, with respect to the diameter D1 of the swirling flow generator 20, the test No. 21-No. In each case, satisfactory results were obtained. Test No. 21 and no. 22, a high dissolved carbon dioxide gas amount (V / V) of 4.28 (V / V) or more despite the circular shape (circular cross section) and the flat shape (elliptical cross section) of the inflow pipe 20b of the swirling flow generator 20. Since V) was obtained, the influence of the cross-sectional shape of the inflow pipe 20b was not observed. However, test no. 23, a relatively low dissolved carbon dioxide gas amount (V / V) of 3.10 is obtained. This is because the nominal diameter of the cross section of the inflow pipe 20b is 1.0S (= inner diameter 23 mmφ). Presumed to be due. Therefore, it is desirable that the inner diameter of the inflow pipe 20b is in a range of 1.0 S (= inner diameter 23 mmφ) or more and 1.5 S (= inner diameter 35, 7 mmφ) or less.

  As described above, according to the carbonated water producing device 10 of the present embodiment, the primary dissolution in the cylindrical swirling flow generator 20 is caused by the inflow of the water W and the carbon dioxide gas CO2 gas-liquid mixture GL in the gas dissolving device 16. The gas-liquid mixture GL passes through the through-hole 22 having a diameter d smaller than the inner diameter D1 of the swirling flow generator 20 from the swirling center portion of the primary swirling flow TF1 swirling in the swirling flow generator 20. When passed, the secondary (high-speed) swirl flow TF2 swirling at a rotation speed higher than the rotation speed of the primary swirl flow TF1 is injected into the cylindrical container 26. The secondary swirl flow TF2 and the swirl flow based thereon are suppressed by the swirl flow suppression plate 32. For this reason, it becomes a secondary swirl flow TF2 having a smaller diameter than the rotation speed of the primary swirl flow TF1 and swirling at a higher rotation, and fine bubbles in the gas-liquid mixture GL of carbon dioxide (gas) CO2 and water (liquid) W. Is sheared more finely. Next, the swirl flow is further sheared by causing the swirl flow restraining plate 32 fixed in the cylindrical container 26 to collide with the swirl flow TF2 or swirl flow based thereon, and the sheared fine bubbles. The clearing of the liquid, which indicates that the gas disappears and the gas is suitably dissolved in the liquid, is obtained in a relatively short time and under low pressure. That is, a small gas dissolving device 16 is obtained in which a gas solution CO2W in which a high concentration of carbon dioxide gas CO2 is dissolved in a relatively low pressure of about 0.4 MPa is obtained in a short time.

  Further, in the gas dissolving device 16 of the present embodiment, the swirl flow generator 20 has a position parallel to the tangential direction of the swirl flow in the swirl flow generator 20 and decentered from the axial center line C1 of the swirl flow generator 20. It has an inflow pipe 20b having an axial center line C2 through which the gas-liquid mixture GL flows through the inflow pipe 20b. For this reason, the primary swirling flow TF1 is suitably generated in the swirling flow generator 20 by flowing the gas-liquid mixture GL.

  Further, in the gas dissolving device 16 of the present embodiment, one end portion of the swirling flow generator 20 is concentrically connected to the cylindrical container 26 via the restrictor 24, and the other end portion of the swirling flow generating device 20 is The cylindrical plate 20a is closed by a disc-shaped cover plate 20a, and the cover plate 20a is provided with a columnar member 20c protruding toward the through hole 22 formed in the diaphragm 24. For this reason, since the volume in the swirling flow generator 20 is reduced by the volume of the cylindrical member 20c, there is an advantage that the primary swirling flow TF1 in the swirling flow generator 20 is further rotated at a higher speed.

  Further, in the gas dissolving device 16 of the present embodiment, the through hole 22 formed in the restrictor 24 is formed to have a smaller diameter from the swirl flow generator 20 side toward the cylindrical container 26. For this reason, it is suitably prevented that turbulent flow is generated in the gas-liquid mixture GL from the swirl flow generator 20 toward the cylindrical container 26.

  Further, in the gas dissolving device 16 of the present embodiment, the swirl flow suppressing plate 32 is parallel to a plane including the radial direction of the cylindrical container 26 and the axial center line C1 direction at least at the outer peripheral portion of the cylindrical container 26 and has an axial center. A plurality of rectifying plates 32a and 32b intersecting each other on the line C1 is provided. For this reason, since the high-speed secondary swirling flow TF2 flowing into the cylindrical container 26 or the swirling flow based on the high-speed swirling flow abuts against the rectifying plates 32a and 32b, the swirling is suppressed. While being melted, the flow resistance in the direction of the axial center line C1 is suppressed as much as possible.

  Moreover, in the carbonated water manufacturing apparatus 10 of the present embodiment, the gas-liquid mixing device 12 includes the first tube portion T1 to which water W is supplied, the second tube portion T2 to which carbon dioxide CO2 is supplied, and the gas-liquid mixture GL. Is output from the nozzle NZ, the nozzle NZ for injecting water W provided in the first pipe T1, and the third pipe T3. In the pipe SMP connected to the third pipe portion T3, the diffuser DF that gradually becomes smaller in diameter from the inlet for receiving the jet and then gradually becomes larger in diameter toward the outlet, and the clockwise and counterclockwise around the axial center line. And the static mixer SM configured by alternately arranging twisted elements EL and ER, and the gas-liquid mixture GL is output from the static mixer SM. For this reason, in the stage before being supplied to the swirl flow generator 20, the gas-liquid mixture GL is suitably agitated to make the carbon dioxide gas CO2 fine, and the contact area of the carbon dioxide gas CO2 with respect to the water W is increased and dissolved. There is an advantage that becomes easy.

  Further, in the carbonated water producing apparatus 10 of the present embodiment, the swirl flow is provided between the static mixer SM and the swirling flow generator 20, and the gas-liquid mixture GL output from the static mixer SM is given a shearing force thereto. A dispersion pump 14 for pumping to the generator 20 is further included. For this reason, in the stage before being supplied to the swirling flow generator 20, a shearing force is applied to the gas-liquid mixture GL and the mixture is suitably stirred to further reduce the carbon dioxide gas CO2, and the carbon dioxide gas CO2 with respect to the water W. There is an advantage that the contact area is increased and dissolution becomes easier. Further, the gas can be dissolved even if the supply pressure of the carbon dioxide gas CO2 is lowered as compared with the case where the dispersion pump 14 is not provided.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, in the swirling flow suppressing device 28 of the above-described embodiment, the swirling flow suppressing plate 32 is composed of the two rectifying plates 32a and 32b that intersect at the axial center line C1, but the intersecting 3 at the axial center line C1. You may be comprised from the sheet | seat or more baffle plates.

  In the above-described embodiment, the inner diameter D1 of the swirling flow generator 20 may be larger or smaller than the inner diameter D2 of the cylindrical container 26.

The above description is only an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

10: carbonated water production device 12: gas-liquid mixing device 14: dispersion pump 16: gas dissolving device 18: buffer tank 20: swirl flow generator 20a: lid plate 20b: inflow pipe 20c: cylindrical member 22: through hole 24: Restrictor 26: cylindrical container 28: swirl flow restraint device 30: main body 32: swirl flow restraint plate 34: diameter-reducing joint CO2: carbon dioxide gas (gas G)
CO2W: Carbonated water (gas solution)
DF: Diffuser EL, ER: Element GL: Gas-liquid mixture NZ: Nozzle SM: Static mixer T: Merge pipe T1: First pipe part T2: Second pipe part T3: Third pipe part W: Water (liquid L)

Claims (7)

A method for producing a gas solution in which a gas is dissolved in a liquid,
A primary swirl flow generating step for generating a primary swirl flow in a swirl flow generator by inflow of the gas-liquid mixture of gas and liquid;
The rotational speed higher than the rotational speed of the swirl flow by passing the mixture from the central part in the swirl flow generator through a restrictor having a through hole smaller in diameter than the inner diameter of the swirl flow generator. A secondary swirling flow generating step of injecting a swirling secondary swirling flow into a cylindrical container having an inner diameter larger than the through hole;
A swirl flow suppressing step of suppressing a swirl flow based on the secondary swirl flow injected into the cylindrical container by a swirl flow restraint plate fixed in the cylindrical container ,
One end of the swirl flow generator is concentrically connected via the cylindrical container and the restrictor, the other end of the swirl flow generator is closed by a disc-shaped cover plate, and the cover plate Includes a columnar member protruding toward a through-hole formed in the restrictor . A gas solution manufacturing apparatus comprising a gas dissolving apparatus for dissolving gas in a liquid,
The gas dissolving device is:
A cylindrical swirling flow generator for generating a primary swirling flow by inflow of the gas and liquid gas-liquid mixture;
A through-hole smaller than the inner diameter of the swirl flow generator is formed, and the mixture passes through the through-hole from the swirl center of the swirl flow in the swirl flow generator. A constrictor for injecting a secondary swirling flow swirling at a higher rotational speed,
A cylindrical container having an inner diameter larger than the through hole of the restrictor, and receiving the secondary swirling flow that has passed through the through hole at one end and flowing out from the other end;
A swirl flow suppressing plate fixed in the cylindrical container and suppressing swirl flow based on the secondary swirl flow ,
One end portion of the swirling flow generator is concentrically connected via the cylindrical container and the restrictor, and the other end portion of the swirling flow generator is closed by a disc-shaped cover plate,
The gas dissolution liquid manufacturing apparatus according to claim 1, wherein the lid plate is provided with a columnar member protruding toward a through hole formed in the restrictor .   The swirl flow generator has an inflow pipe having an axial center line at a position parallel to a tangential direction of the swirl flow in the swirl flow generator and decentered from the axial center line of the swirl flow generator. The apparatus for producing a gas solution according to claim 2, wherein the mixture of the liquid and the gas is caused to flow through. Through holes formed in the wringer, according to any one of claims 2 or 3, characterized in that it is formed such that the diameter decreases toward the cylindrical container from the swirling flow generator side Gas dissolved liquid production equipment. The swirl flow suppressing plate has a plurality of rectifying plates that are parallel to a plane including a radial direction and an axial centerline direction of the cylindrical container at least at an outer peripheral portion of the cylindrical container and intersect each other at the axial centerline. The gas solution production apparatus according to any one of claims 2 to 4 , wherein the gas solution production apparatus is one. A merging pipe having a first pipe part to which the liquid is supplied, a second pipe part to which the gas is supplied, and a third pipe part to which the gas-liquid mixture is output;
A nozzle for injecting the liquid provided in the first pipe portion;
A diffuser which is provided in the third pipe portion and gradually becomes a small diameter from an inlet for receiving a jet flow from the nozzle, and then gradually becomes a large diameter toward the outlet;
A gas-liquid mixing device comprising: a static mixer configured by alternately arranging clockwise and counterclockwise elements around an axial center line in a pipe connected to the third pipe part. Including
The gas-liquid mixture according to any one of claims 2 to 5 , wherein the gas-liquid mixture is output from the static mixer. A dispersion pump that is provided between the gas-liquid mixing device and the swirling flow generator and pumps the gas-liquid mixture output from the gas-liquid mixing device to the swirling flow generating device while applying a shearing force thereto. The gas solution production apparatus according to claim 6 , further comprising:

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