JP5816605B2 - Gas dissolving device - Google Patents

Description

  The present invention relates to a gas dissolving apparatus provided with a gas-liquid mixing ejector.

  As a gas dissolving device that injects liquid and gas into a closed tank and dissolves the gas in the liquid, the liquid pressurized from the outside and the liquid mixed with gas or bubbles are placed on the top of the closed tank (pressure vessel) A nozzle having one or a plurality of holes for spraying toward the surface, supporting a bowl-shaped gas-liquid separator in the space in the lower part of the sealed tank, and the clearance between the inner surface of the sealed tank and the outer surface of the gas-liquid separator And a gas dissolution apparatus that selectively performs gas-liquid separation based on the relationship between the flow-down speed depending on the flow rate and the rising speed of bubbles in the liquid (see, for example, Patent Document 1).

JP 2010-269299 A

  This gas dissolution device is capable of gas dissolution by a circulating flow or vortex generated in a closed tank above the gas-liquid separator, but from a nozzle provided at the top of such a closed tank. It is difficult to dissolve a high-concentration gas in the liquid only by injecting the pressurized liquid and the liquid in which the gas or bubbles are mixed into the sealed tank.

  This invention is made | formed in view of such a point, and it aims at providing the gas dissolving apparatus which can perform high concentration gas dissolution in the liquid.

The invention described in claim 1 is formed by sucking the liquid in the closed tank into the closed tank and a gas-liquid mixed flow of gas and liquid that is installed upward in the closed tank and supplied to the lower part from the outside. A gas-liquid mixing ejector that injects the gas-liquid mixing jet flow upward, gas-liquid supply means for supplying gas and liquid to the gas-liquid mixing ejector, and a liquid outlet located below the gas-liquid mixing ejector. A liquid take-out means for taking out the liquid in which the gas in the tank is dissolved, and the sealed tank has a gas chamber in which the upper gas is stored with respect to the liquid chamber in which the lower liquid is stored. Supplies the gas-liquid mixing ejector jetted from the gas-liquid mixing ejector to the gas-liquid mixing ejector to the extent that it can be ejected from the liquid level in the sealed tank into the gas chamber and sprayed in the gas in the gas chamber Liquid The a pump for pressurizing, in a gas chamber, a gas dissolution apparatus configuration splashes of liquid is to promote the dissolution of gas into contact with a gas in a liquid.

According to a second aspect of the present invention, there is provided the gas dissolving apparatus according to the first aspect, wherein the gas dissolution rate in the liquid decreases as the gas dissolution concentration in the liquid in the sealed tank increases and the volume of the gas chamber is reduced. In order to stop the gas supply to the gas-liquid mixing ejector by detecting the lower limit position of the liquid level that descends by expanding the liquid level and detecting the lower limit position of the liquid level by the liquid level detecting means The control means and the configuration for outputting the above signal.

  The invention described in claim 3 is such that the gas-liquid supply means in the gas dissolving apparatus according to claim 1 or 2 pressurizes and supplies gas and liquid to the gas-liquid mixing ejector.

  According to a fourth aspect of the present invention, the gas-liquid mixing ejector in the gas dissolving device according to the first or second aspect causes the gas supplied from the outside to be sucked into the liquid flow generated by the liquid pressurized and supplied from the outside. A first ejector for generating a gas-liquid mixed flow and a second ejector for injecting a gas-liquid mixed flow obtained by sucking the liquid in the sealed tank into the gas-liquid mixed flow discharged from the first ejector. It is a thing.

  According to a fifth aspect of the present invention, there is provided a gas-liquid mixing ejector wherein the gas-liquid supply means in the gas dissolving apparatus according to the first or second aspect of the present invention sucks the gas together with the liquid and raises the pressure while mixing and transferring the gas-liquid. Is equipped with a vortex pump that pressurizes the gas-liquid mixed flow.

  According to the first aspect of the present invention, the gas formed by sucking the liquid in the sealed tank into the gas-liquid mixed flow of gas and liquid supplied to the lower part of the gas-liquid mixing ejector by the gas-liquid supply means and mixing them inside. The process of vigorously mixing and stirring gas and liquid inside and outside the gas-liquid mixing ejector by injecting the liquid-mixed jet flow from the upper part of the gas-liquid mixing ejector into the liquid in the sealed tank, and the gas and liquid jetted from the gas-liquid mixing ejector A process of accelerating dissolution of the gas in the liquid by ejecting the mixed jet flow from the liquid level in the sealed tank to the gas chamber, spraying it in the gas in the gas chamber, and bringing it into collision contact with the gas in a large contact area; In combination, gas can be efficiently dissolved in the liquid, and high-concentration gas can be dissolved in the liquid. Further, the liquid take-out means takes out the gas-dissolved liquid in the closed tank from the liquid take-out outlet located below the gas-liquid mixing ejector, so that the undissolved liquid not dissolved in the liquid in the closed tank. Even when the air bubbles descend from the liquid level in the tank, they are sucked into the gas-liquid mixing ejector together with the liquid around the ejector before reaching the liquid outlet, so that the gas is dissolved. Only the liquid can be taken out.

  According to the second aspect of the present invention, the gas dissolution rate in the liquid decreases as the gas dissolution concentration in the liquid in the sealed tank increases, and the volume of the gas chamber increases, that is, the sealed tank. Since the control means outputs a signal for stopping the supply of gas to the gas-liquid mixing ejector by detecting the lower limit position of the liquid level by the liquid level detecting means by utilizing the phenomenon that the liquid level in the inside is lowered. The gas dissolution concentration can be managed by a simple system.

  According to the third aspect of the invention, not only the liquid but also the gas is pressurized and supplied to the gas-liquid mixing ejector, so the pump for supplying the liquid may be an inexpensive one that can be used in a low pressure region. The gas suction function of the gas-liquid mixing ejector can efficiently dissolve a large amount of gas in the liquid and can dissolve the gas at a high concentration in the liquid.

  According to the invention of claim 4, since the gas supplied from the outside is sucked into the liquid flow generated by the liquid pressurized and supplied from the outside by the first ejector, a gas pressure source is unnecessary and a large amount Gas can be sucked, and the gas-liquid mixed flow is made by mixing the gas and liquid by the first ejector, and the liquid in the sealed tank is sucked and mixed into the gas-liquid mixed flow by the second ejector, and the gas-liquid mixed injection The process of creating a flow and the process of jetting this gas-liquid mixed jet from the liquid level in the sealed tank to the gas chamber to mix the gas and liquid in the gas chamber can efficiently dissolve the gas in the liquid. High concentration gas can be dissolved in the liquid.

  According to the fifth aspect of the present invention, since the vortex pump sucks the gas together with the liquid, there is no need for a gas pressure source. Since the gas-liquid mixed flow is pressurized and supplied to the ejector, the gas-liquid mixed flow is created by mixing the gas-liquid in the vortex pump, and the gas-liquid mixed flow is sucked into the gas-liquid mixed flow by the gas-liquid mixed flow. The gas-liquid mixed jet flow and the gas-liquid mixed jet flow jetting the gas-liquid mixed jet flow into the gas chamber and mixing the gas-liquid can efficiently dissolve the gas in the liquid. High concentration gas dissolution can be achieved.

1 is a circuit diagram showing a first embodiment of a gas dissolving apparatus according to the present invention. It is sectional drawing which shows the gas-liquid mixing ejector of an apparatus same as the above. It is a circuit diagram which shows 2nd Embodiment of the gas dissolving apparatus which concerns on this invention. It is sectional drawing which shows the gas-liquid mixing ejector of an apparatus same as the above. It is a circuit diagram which shows 3rd Embodiment of the gas dissolving apparatus which concerns on this invention. It is sectional drawing which shows the gas-liquid mixing ejector of an apparatus same as the above. It is sectional drawing which shows the eddy current pump of an apparatus same as the above.

  Hereinafter, the present invention will be described with reference to the first embodiment shown in FIGS. 1 and 2, the second embodiment shown in FIGS. 3 and 4, and the third embodiment shown in FIGS. This will be described in detail based on the above.

  First, the first embodiment shown in FIGS. 1 and 2 will be described.

  FIG. 1 shows the entirety of a gas dissolving apparatus 11, which is configured around a cylindrical sealed tank 12 having a spherical tank lower bottom 12a and a tank canopy 12b. The closed tank 12 has a gas chamber 14 in which an upper gas is stored with respect to a liquid chamber 13 in which a lower liquid is stored. In the liquid chamber 13 in the sealed tank 12, a gas-liquid mixing ejector 15A is installed upward.

  As shown in FIG. 2, the gas-liquid mixing ejector 15 </ b> A integrates the nozzle portion 16 and the diffuser 17 by a plurality of connecting portions 18 with the inlet 17 a of the diffuser 17 facing the tip of the nozzle portion 16. This is an ejector structure in which a liquid suction port 19 for sucking liquid between the tip of the nozzle portion 16 and the inlet 17a of the diffuser 17 is provided between the plurality of connecting portions 18.

  The diffuser 17 is continuously formed with a throat portion 17b formed so as to restrict the passage with respect to the inlet 17a, and a trumpet-shaped passage cross-sectional enlarged portion 17c that gradually expands the passage cross-sectional area with respect to the throat portion 17b. The outlet 17d is opened upward.

  Connected to the inlet side of the nozzle portion 16 is a gas-liquid supply pipe portion 22 of gas-liquid supply means 21A for supplying the gas A and the liquid B to the gas-liquid mixing ejector 15A. The gas-liquid supply pipe section 22 is configured such that a gas injection pipe 23 for injecting gas A is inserted concentrically into a liquid supply pipe 24 for supplying liquid B via a circumferential liquid passage gap.

  Therefore, when the gas-liquid mixing ejector 15A supplies the gas-liquid mixed flow C of the gas A and the liquid B from the gas-liquid supply means 21A to the nozzle portion 16 below from the outside, the gas-liquid mixing ejected from the tip of the nozzle portion 16 A gas-liquid mixed jet stream E is formed in which the liquid D in the closed tank 12 is sucked into the stream C, mixed, and jetted, and the gas-liquid mixed jet stream E is jetted from the upper outlet 17d. .

  As shown in FIG. 1, the tank canopy 12b of the sealed tank 12 is provided with a gas-liquid separator 26 that separates the gas-liquid in the sealed tank 12 and discharges only the gas to the outside. A pressure gauge 27 for measuring the pressure in the closed tank 12 and an electromagnetic pressure release valve 28 for releasing the pressure in the closed tank 12 are connected to 26. In the case of a gas that cannot be released to the atmosphere, the pressure relief valve 28 is connected to a facility for collecting the gas.

  The gas-liquid supply means 21A supplies gas and liquid to the gas-liquid mixing ejector 15A under pressure, and includes a valve 32 from a gas supply source 31 such as an oxygen cylinder or a carbon dioxide gas cylinder, a valve 33 that is opened and closed electromagnetically, and Pumps and pressurizes liquid from a gas supply piping system 35 that supplies a gas such as oxygen or carbon dioxide in a pressurized state to the gas-liquid mixing ejector 15A via a check valve 34 and a liquid tank 36 such as a sewage treatment plant or a bathtub. A liquid supply piping system 40 that pressurizes and supplies liquid from the pump 37A to the gas-liquid mixing ejector 15A through the check valve 38 and the pressure gauge 39 is provided.

  The pump 37A of the liquid supply piping system 40 jets the gas-liquid mixed jet stream E injected from the gas-liquid mixing ejector 15A from the liquid surface F in the sealed tank 12 to the gas chamber 14, and in the gas in the gas chamber 14 Is provided with a function of pressurizing the liquid B supplied to the gas-liquid mixing ejector 15A to such an extent that it can be sprayed and brought into collision contact with the gas with a large contact area.

  A liquid take-out means 41 for taking out the liquid in which the gas in the closed tank 12 is dissolved is provided on the bottom bottom 12a of the closed tank 12. This liquid take-out means 41 is provided with a liquid take-out outlet 42 located below the gas-liquid mixing ejector 15A in the tank lower bottom portion 12a of the sealed tank 12, and the gas-dissolved liquid taken out from the liquid take-out outlet 42 is supplied with a valve 43. A return piping system 44 that returns to the liquid tank 36 is provided.

  Inside the sealed tank 12, a gas-liquid separation layer portion 45 is formed between the liquid inlet 19 and the liquid outlet 42 of the gas-liquid mixing ejector 15A. The gas-liquid separation layer 45 separates the large bubble gas that was not dissolved in the liquid, and the separated bubble gas is sucked into the liquid suction port 19 of the gas-liquid mixing ejector 15A together with the liquid around the ejector. Then, it is configured to be dissolved again in the liquid.

  A liquid level gauge 46 for detecting the level of the liquid level F in the closed tank 12 is installed along the closed tank 12 outside the closed tank 12. This liquid level gauge 46 communicates the tank bottom 12a and the tank canopy 12b of the sealed tank 12 with a transparent communication pipe 47 piped in parallel with the closed tank 12, and the liquid level of the communication pipe 47 is sealed. Since it is interlocked with the liquid level in the tank 12, the level of the liquid level F in the sealed tank 12 can be visually confirmed from the outside through the communication pipe 47.

  At a relatively lower portion of the communication pipe 47, for example, a capacitive liquid level sensor, an electrode for detecting the lower limit position of the liquid level F that falls in accordance with the increase of the gas dissolution concentration in the liquid in the sealed tank 12 Liquid level detecting means 48 such as a liquid level sensor is provided.

  Control means 49 such as a control panel for outputting a signal for stopping the supply of the gas A to the gas-liquid mixing ejector 15A by detecting the lower limit position of the liquid level F by the liquid level detection means 48 is provided. From this control means 49, a signal for opening and closing the electromagnetic pressure relief valve 28, a signal for opening and closing the electromagnetic valve 33 provided in the gas supply piping system 35, a signal for starting and stopping the pump 37A, or a buzzer and a lamp A signal for operating the abnormality alarm 50 is output.

  Next, the function and effect of the embodiment shown in FIGS. 1 and 2 will be described.

  The gas supplied from the gas supply source 31 through the gas supply piping system 35 is mixed with the liquid supplied from the liquid tank 36 to the lower part of the gas-liquid mixing ejector 15A by the pump 37A, and the liquid is supplied to the nozzle portion 16 of the gas-liquid mixing ejector 15A. A gas-liquid mixed stream C is pressurized and supplied, and a high-speed gas-liquid mixed stream C is ejected from the tip of the nozzle part 16 through the inlet 17a of the diffuser 17 toward the throat part 17b.

  Since a negative pressure space is formed around the high-speed gas-liquid mixed flow, the liquid D in the sealed tank 12 is sucked from the surrounding liquid suction port 19 so as to be sucked into the negative pressure space. The gas-liquid mixed flow in which the mixed flow C and the liquid D are mixed is pressurized while being mixed and stirred from the throat portion 17b of the diffuser 17 by the trumpet-shaped passage cross-sectional enlarged portion 17c and injected from the upper outlet 17d. The gas-liquid mixed jet E ejected from the gas-liquid mixed ejector 15A is jetted from the liquid level F in the sealed tank 12 to the gas chamber 14 through the liquid in the sealed tank 12, and is splattered. The liquid splashed in the gas in the gas chamber 14 falls to the liquid level in the tank while colliding with the gas in a state where the contact area with the gas is enlarged.

  At this time, a vigorous gas-liquid mixing action occurs inside the gas-liquid mixing ejector 15A, and a vigorous gas-liquid mixing and stirring action occurs between the gas-liquid mixing jet E ejected from the gas-liquid mixing ejector 15A and the liquid in the tank. Furthermore, the gas-liquid mixed jet stream E in the gas chamber 14 is ejected, splashed, and collided with the gas to cause a vigorous gas-liquid mixing action, which promotes the dissolution of the gas in the liquid in the sealed tank 12 Is done.

  By using the gas-liquid mixing ejector 15A, the periphery of the gas-liquid mixed flow C ejected from the nozzle portion 16 to the throat portion 17b of the diffuser 17 at a high speed becomes a vacuum state, and the gas-liquid mixed flow C generates a large amount of the surrounding liquid D. The gas-liquid mixed injection flow E flows into the passage cross-sectional enlarged portion 17c while being sucked and is pressurized and injected while being mixed and stirred inside the passage cross-sectional enlarged portion 17c. The ambient suction amount of the liquid D in the closed tank 12 is 3 to 4 times the original supply amount of the mixed flow C, and the total injection amount of the gas-liquid mixed injection flow E injected from the diffuser 17 is This is the sum of the original supply amount of the mixed flow C and the ambient suction amount that is 3 to 4 times the original supply amount. Therefore, since the injection amount of the gas-liquid mixed injection flow E injected from the gas-liquid mixing ejector 15A is remarkably increased, the gas-liquid mixing and stirring ability at each stage in the closed tank 12 is enhanced, and the gas is dissolved in the liquid. Increases efficiency.

  In particular, when the gas-liquid mixed jet E ejected from the gas-liquid mixing ejector 15A is ejected into the gas chamber 14 functioning as the gas-liquid contact space, the gas-liquid mixed jet flow E is splashed in the gas chamber 14 and is larger than the gas in the gas chamber 14. Since the collision contact is made in the contact area, the dissolution of the gas in the liquid can be efficiently promoted.

  Further, since the gas-liquid mixing ejector 15A sucks undissolved gas together with the liquid from the surroundings, that is, undissolved that descends by convection from the gas chamber 14 without being dissolved in the liquid while remaining in the form of relatively large bubbles. Since the gas is sucked together with the liquid by the gas-liquid mixing ejector 15A located above the gas-liquid separation layer part 45, the undissolved gas can be prevented from being discharged from the liquid outlet 42 of the sealed tank 12.

  That is, the liquid take-out means 41 takes out the gas-dissolved liquid in the sealed tank 12 from the liquid take-out outlet 42 located below from the gas-liquid mixing ejector 15A through the gas-liquid separation layer 45, Even when undissolved bubbles that are not dissolved in the liquid in the tank 12 descend on the liquid circulation flow from the liquid surface F, the liquid around the ejector is supplied to the gas-liquid mixing ejector 15A before reaching the liquid outlet 42. Since it is sucked together and gas-liquid mixed again, only the liquid in which the gas is dissolved can be taken out.

  In these multiple or repeated gas-liquid mixing processes, the gas is efficiently dissolved in the liquid, and the high-concentration gas is dissolved in the liquid in the sealed tank 12. For example, carbon dioxide gas is supplied from the gas supply source 31. When doing so, the liquid tank 36 becomes a carbonated spring bathtub.

  Further, by managing the liquid level F in the closed tank 12, the dissolved concentration of the gas in the liquid is indirectly detected, and the operation and stop of the gas dissolving device 11 are appropriately managed.

  That is, as the gas dissolution concentration in the liquid in the closed tank 12 increases, the gas dissolution rate in the liquid decreases and the volume of the gas chamber 14 increases, that is, the liquid level F in the closed tank 12. The control means 49 closes at least the electromagnetic valve 33 provided in the gas supply piping system 35 by detecting the lower limit position of the liquid level F by the liquid level detection means 48 using the phenomenon that the liquid level is lowered. A function of automatically stopping the supply of the gas A to the gas-liquid mixing ejector 15A is provided.

  At that time, the control means 49 automatically stops the supply of the gas A immediately by the first liquid level detection by the liquid level detection means 48, monitors the natural rise of the liquid level F, and restarts the supply of the gas A. However, the present invention is not limited to this. For example, the electromagnetic pressure relief valve 28 is opened at the first liquid level detection, the pressure relief control is performed, and the liquid level F is once raised to a predetermined position. Supplying gas A to the gas-liquid mixing ejector 15A by closing the electromagnetic valve 33 at the time of detecting multiple times by setting the lowering limit position by repeating the phenomenon of lowering the liquid level F by closing 28 May be automatically stopped. In this way, the gas dissolution concentration in the liquid in the sealed tank 12 can be further increased.

  If the supply of gas A is stopped, the liquid level lowering stop effect does not appear, and if the liquid level F continues to decrease, the pump 37A is stopped and the circulation of the liquid B is automatically stopped.

  Alternatively, an abnormality alarm device 50 such as a buzzer or a lamp may be activated by a signal output from the control means 49 to instruct the operator to close the valve 33 or stop the pump 37A. Good.

  As described above, the embodiment shown in FIGS. 1 and 2 pressurizes and supplies the gas from the gas supply source 31, and is therefore suitable for supplying a gas having a gas pressure and a large gas flow rate. According to the embodiment, the liquid D in the closed tank 12 is sucked into the gas-liquid mixed flow C of gas and liquid supplied to the lower part of the gas-liquid mixing ejector 15A by the gas-liquid supply means 21A and mixed and stirred in the diffuser 17. The process of vigorously mixing and stirring the gas and liquid in and out of the gas-liquid mixing ejector 15A by injecting the pressurized gas-liquid mixing jet E from the upper part of the gas-liquid mixing ejector 15A into the liquid in the sealed tank 12 The gas-liquid mixed jet E ejected from the gas-liquid mixing ejector 15A is ejected from the liquid surface F in the sealed tank 12 to the gas chamber 14, and the liquid spattered in the gas in the gas chamber 14 and the gas chamber 14 Collide with a large amount of contact area By bringing them into contact with each other, a high-concentration gas can be dissolved in the liquid by combining the process of efficiently dissolving the gas in the liquid.

  In particular, the total injection amount of the gas-liquid mixed injection flow E injected from the gas-liquid mixing ejector 15A is the supply liquid flow rate from the gas-liquid supply means 21A, the supply gas flow rate, and the original supply of these gas-liquid mixed flows C This is the total amount of suction liquid flow from around the ejector that is 3 to 4 times the amount. Since it is significantly higher than the original supply amount, the gas-liquid mixing and stirring ability at each stage in the sealed tank 12 is increased, and a high concentration into the liquid. Gas can be dissolved.

  Further, the liquid take-out means 41 takes out the gas-dissolved liquid in the sealed tank 12 from the liquid take-out outlet 42 located below from the gas-liquid mixing ejector 15A via the gas-liquid separation layer 45, The undissolved bubbles that are not dissolved in the liquid in the tank 12 are brought together with the liquid around the ejector into the gas-liquid mixing ejector 15A before reaching the liquid outlet 42 even when descending on the liquid circulation flow from the liquid level F. Since the liquid is sucked and mixed again, only the liquid in which the gas is dissolved can be taken out.

  Also, by managing the liquid level F in the closed tank 12 in the circulation system in the closed tank 12, the dissolved concentration of the gas in the liquid can be indirectly detected, and the operation and stoppage of the apparatus can be appropriately managed. .

  That is, when the gas dissolution rate in the liquid decreases as the gas dissolution concentration in the liquid in the sealed tank 12 increases, the volume of the gas chamber 14 increases and the liquid level F in the sealed tank 12 decreases. Since the control means 49 outputs a signal for stopping the supply of gas to the gas-liquid mixing ejector 15A by detecting the lowering limit position of the liquid level F by the liquid level detection means 48 using the phenomenon to be performed, it is simple. Gas dissolution concentration can be appropriately managed by a simple system.

  Further, since not only the liquid B but also the gas A is pressurized and supplied to the gas-liquid mixing ejector 15A, the pump 37A for supplying the liquid B may be an inexpensive one that can be used in a low pressure region. A large amount of gas A can be efficiently dissolved in the liquid by the gas suction function of the mixing ejector 15A, and high-concentration gas can be dissolved in the liquid.

  In addition, the gas-liquid mixing ejector 15A in the sealed tank 12 does not require a rotating shaft like a rotary vane pump, so it does not require a liquid-tight seal of the rotating shaft, and is composed of simple and inexpensive parts. As well as being easy to maintain.

  Next, a second embodiment shown in FIGS. 3 and 4 will be described. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIG. 3, the closed tank 12 and the liquid D in the closed tank 12 are connected to the gas-liquid mixed flow C of the gas A and the liquid B which are installed upward in the closed tank 12 and supplied from the outside to the lower part. From the gas-liquid mixing ejector 15B that injects the gas-liquid mixing jet flow E formed by sucking the gas upward, the gas-liquid supply means 21B for supplying gas and liquid to the gas-liquid mixing ejector 15B, and the gas-liquid mixing ejector 15B Liquid take-out means 41 for taking out the liquid in which the gas in the closed tank 12 is dissolved from the liquid take-out outlet 42 located below via the gas-liquid separation layer 45, and gas dissolution in the liquid in the closed tank 12 The liquid level detection means 48 for detecting the lower limit position of the liquid level F that falls in accordance with the increase in concentration, and the gas to the gas-liquid mixing ejector 15B by the detection of the lower limit position of the liquid level F by the liquid level detection means 48 To stop the supply of A or gas A and liquid B The closed tank 12 has a gas chamber 14 in which the upper gas is stored with respect to the liquid chamber 13 in which the lower liquid is stored, and the gas-liquid supply unit 21B Gas-liquid mixing to such an extent that the gas-liquid mixed jet E injected from the mixing ejector 15B can be ejected from the liquid level F in the sealed tank 12 to the gas chamber 14 and sprayed in the gas in the gas chamber 14. A pump 37B for pressurizing the liquid B supplied to the ejector 15B is provided.

  As shown in FIG. 4, the gas-liquid mixing ejector 15 </ b> B generates a gas-liquid mixing flow C by sucking the gas A supplied from the outside into the liquid flow generated by the liquid B pressurized and supplied from the outside. 1 ejector 15B1 and 2nd ejector 15B2 which injects the gas-liquid mixed injection flow E added by sucking the liquid D in the closed tank 12 to the gas-liquid mixed flow C discharged from the first ejector 15B1 It is equipped.

  The second ejector 15B2 has the same structure as the gas-liquid mixing ejector 15A shown in FIG. 2, and the first ejector 15B1 is similar to the second ejector 15B2 and has an inlet for the diffuser 25b on the tip of the nozzle portion 25a. In this state, the nozzle portion 25a and the diffuser 25b are integrally formed, and the gas A is sucked from the gas supply piping system 35 between the tip of the nozzle portion 25a and the inlet of the diffuser 25b.

  In the first ejector 15B1, a liquid jet flow is generated on the tip of the nozzle portion 25a by the liquid B supplied under pressure from the outside, and a negative pressure is generated around the liquid jet flow. When the gas A sucked in the liquid jet flow is mixed and stirred with the liquid B, and further, the gas-liquid mixed flow C formed by the first ejector 15B1 is supplied to the nozzle portion 16 of the second ejector 15B2. The liquid D in the sealed tank 12 is sucked into the gas-liquid mixed flow C ejected from 16, and a gas-liquid mixed jet E that is pressurized while being mixed and stirred in the diffuser 17 is formed.

  This gas-liquid mixed jet E is ejected from the liquid level F in the closed tank 12 through the liquid in the closed tank 12 to the gas chamber 14 and is sprayed into the gas in the gas chamber 14 with a large contact area. By colliding with the gas in the gas chamber 14, the gas is efficiently dissolved in the liquid.

  The gas-liquid mixing action inside the gas-liquid mixing ejector 15B, the mixing and stirring action of the gas-liquid mixing jet E injected from the gas-liquid mixing ejector 15B and the liquid in the tank, and the gas-liquid mixing jet E Dissolution of the gas in the liquid in the sealed tank 12 is promoted by the jetting, spraying, and gas-liquid collision contact action in the gas chamber 14.

  In particular, by using a gas-liquid mixing ejector 15B with a two-stage ejector structure, even when the gas supply pressure is low or when a gas such as air is sucked at atmospheric pressure, a large amount of gas A is sucked by the first ejector 15B1. In addition, since the gas A and the liquid D sucked from the sealed tank 12 can be vigorously mixed and stirred by the second ejector 15B2, the gas is efficiently dissolved in the liquid.

  Further, when the gas-liquid mixing ejector 15B sucks in liquid and gas from the surroundings, the undissolved gas can be injected again and dissolved, and the undissolved gas is discharged from the liquid outlet 42 of the sealed tank 12. Can be prevented.

  Furthermore, by managing the liquid level F in the closed tank 12, it is possible to indirectly detect the dissolved concentration of the gas in the liquid and appropriately manage the operation and stoppage of the apparatus.

  As described above, in the embodiment shown in FIGS. 3 and 4, since the first ejector 15B1 sucks the gas A, the gas pressure at the gas supply source is low (that is, the atmospheric pressure or the low pressure close to the atmospheric pressure). In addition, according to this embodiment, the liquid flow generated by the liquid B pressurized and supplied from the outside by the first ejector 15B1 is supplied from the outside. Since the gas A is sucked, a pressure source of the gas A is unnecessary and a large amount of the gas A can be sucked. Furthermore, the first ejector 15B1 mixes the gas and liquid to form the gas-liquid mixed flow C, The process in which the gas / liquid is vigorously mixed and stirred inside / outside the gas / liquid mixing ejector 15B by sucking the liquid D in the closed tank 12 into the gas / liquid mixing flow C by the ejector 15B2 and mixing and stirring to create the gas / liquid mixing jet E. And gas-liquid mixed injection E is ejected from the liquid level F in the sealed tank 12 to the gas chamber 14 and the gas-liquid is mixed in the gas chamber 14, so that the gas can be efficiently dissolved in the liquid, and the high in the liquid. A concentration of gas can be dissolved.

  Next, the third embodiment shown in FIGS. 5 to 7 will be described. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIG. 5, the closed tank 12 and the liquid D in the closed tank 12 are connected to the gas-liquid mixed flow C of the gas A and the liquid B which are installed upward in the closed tank 12 and supplied from the outside to the lower part. A gas-liquid mixing ejector 15C that injects the gas-liquid mixing jet flow E formed by sucking the gas upward, a gas-liquid supply means 21C for supplying gas A and liquid B to the gas-liquid mixing ejector 15C, and a gas-liquid mixing ejector Liquid take-out means 41 for taking out the liquid in which the gas in the closed tank 12 is dissolved from the liquid take-out outlet 42 located below 15C, and according to the increase in the concentration of dissolved gas in the liquid in the closed tank 12 In order to stop the supply of the gas A to the gas-liquid mixing ejector 15C by detecting the lower limit position of the lowering liquid level and detecting the lower limit position of the liquid level F by the liquid level detecting means 48. Control means 49 for outputting the following signal: The closed tank 12 has a gas chamber 14 in which the upper gas is stored with respect to the liquid chamber 13 in which the lower liquid is stored, and the gas-liquid supply means 21C receives the gas-liquid mixing jet E injected from the gas-liquid mixing ejector 15C. Eddy current as a pump that pressurizes the liquid supplied to the gas-liquid mixing ejector 15C to such an extent that it can be ejected from the liquid level F in the sealed tank 12 into the gas chamber 14 and sprayed in the gas of the gas chamber 14 It is equipped with a pump (trade name: vortex turbo mixer) 37C.

  The gas-liquid supply means 21C supplies the gas-liquid mixed flow C mixed and stirred by the vortex pump 37C to the gas-liquid mixing ejector 15C under pressure, and the vortex flows through the valve 33 and the check valve 34 that are opened and closed electromagnetically. A gas-liquid mixed flow C is supplied to a gas-liquid mixing ejector 15C through a check valve 38 and a pressure gauge 39 from a gas supply piping system 35 that sucks gas into the pump 37C, and a vortex pump 37C that pumps and pressurizes liquid from the liquid tank 36 And a gas-liquid supply piping system 40C for supplying pressure.

  As shown in FIG. 6, the gas-liquid mixing ejector 15C receives the supply of the gas-liquid mixed flow C mixed and stirred by the vortex pump 37C at the nozzle portion 16, and the gas-liquid mixing ejected from the tip of the nozzle portion 16 In the flow, the liquid D in the closed tank 12 is sucked, mixed and stirred, and a gas-liquid mixed jet stream E that is jetted upward is formed.

  As shown in FIG. 7, in the vortex pump 37 </ b> C, the impeller 54 in which the small blades 52 and the blade grooves 53 are alternately formed in the pump body 51 along the outer peripheral edge is rotated by the rotation shaft 55. A booster passage 56 is formed in the pump main body 51 in a ring shape along the impeller 54, and an inlet portion 57 located at one end of the booster passage 56 and an outlet located at the other end of the booster passage 56 The part 58 is disposed via the isolation part 59.

  A liquid suction port 60 for sucking the liquid B from the liquid tank 36 by the rotation of the impeller 54 is communicated with the inlet portion 57 of the pressure increase passage 56, and a pump by the rotation of the impeller 54 is connected to the outlet portion 58 of the pressure increase passage 56. A gas-liquid discharge port 61 for discharging the gas-liquid mixture pressurized while being stirred in the main body 51 to the outside is communicated. The tip of the gas supply piping system 35 is inserted between the liquid suction port 60 and the inlet portion 57 of the pressure increase passage 56, and this gas supply is caused by the negative pressure generated on the wall of the suction passage when the vortex pump 37C sucks the liquid B. Gas A is sucked from the piping system 35. When the gas A sucked into the vortex pump 37C is stopped, the electromagnetic valve 33 is controlled to be closed.

  When the impeller 54C rotates the impeller 54 via the rotating shaft 55 by a motor (not shown) provided outside, the small blade 52 and the blade groove 53 of the impeller 54 are concentric with the impeller 54. The liquid in the pressure increase passage 56 is rotated along with the liquid in the liquid tank 36, and the liquid in the liquid tank 36 is sucked into the pressure increase passage 56 from the liquid suction port 60 through the inlet 57 of the pressure increase passage 56. The liquid in the pressure increase passage 56 becomes a vortex between each pressure groove 56 of the impeller 54 and the pressure increase passage 56 while moving along the pressure increase passage 56 together with the impeller 54, and from the gas supply piping system 35 to the pressure increase passage 56. It is vigorously mixed and stirred with the gas sucked in. While such a phenomenon occurs simultaneously in each of the blade grooves 53, the gas-liquid mixture that is gradually pressurized as it travels through the pressure increase passage 56 is discharged from the gas-liquid discharge port 61.

  Thus, the vortex pump 37C is a self-priming pump that can also suck in the gas A by the negative pressure generated when the liquid B is sucked in. Therefore, it is not necessary to pressurize and supply the gas A. When the pressure is low, suction from atmospheric pressure can be made possible. Further, in the pump main body 51, the gas and liquid are vigorously mixed and stirred by the vortex generated in each blade groove 53 of the impeller 54, and the gas A can be efficiently dissolved in the liquid B, and the pressure is gradually increased by the vortex. The gas-liquid mixture can be discharged at a high pressure.

  Thus, the embodiment shown in FIGS. 5 to 7 is a self-priming pump in which the vortex pump 37C can suck the gas A together with the liquid B, so that the gas pressure at the gas supply source is Suitable for supplying a gas that may be a small gas flow rate. Further, according to this embodiment, the vortex pump 37C increases the pressure while mixing and transferring the gas and liquid to the gas and liquid mixing ejector 15C to mix the gas and liquid. Since the flow C is pressurized, the process of mixing the gas and liquid in the vortex pump 37C to dissolve the gas in the liquid, and the liquid D in the closed tank 12 to the gas-liquid mixed flow C by the gas-liquid mixing ejector 15C. The process of agitating and agitating the mixture to create a gas-liquid mixed jet flow E to mix and stir the gas and liquid vigorously inside and outside the gas-liquid mixing ejector 15C, and jetting the gas-liquid mixed jet E into the gas chamber 14 Gas is dissolved in the liquid by mixing the gas and liquid in 14 By the extent, the gas can be a dissolved efficiently in the liquid.

  As described above, the first embodiment shown in FIGS. 1 and 2, the second embodiment shown in FIGS. 3 and 4, and the third embodiment shown in FIGS. What is necessary is just to select the gas injection system according to the property and environment of gas from the form.

  The present invention may be used by a business operator who manufactures, sells or constructs a gas dissolving device.

A Gas B Liquid C Gas-liquid mixed flow D Liquid in sealed tank E Gas-liquid mixed jet flow F Liquid level in sealed tank
12 Airtight tank
13 Liquid chamber
14 Gas chamber
15A, 15B, 15C Gas-liquid mixing ejector
15B1 First ejector
15B2 Second ejector
21A, 21B, 21C Gas-liquid supply means
37A, 37B pump
Eddy current pump as 37C pump
41 Liquid removal means
42 Liquid outlet
48 Liquid level detection means
49 Control means

Claims (5)

A sealed tank;
Gas-liquid mixing that is installed upward in this sealed tank and injects upward the gas-liquid mixed jet formed by sucking the liquid in the sealed tank into the gas-liquid mixed flow of gas and liquid supplied to the lower part from the outside An ejector,
Gas-liquid supply means for supplying gas and liquid to the gas-liquid mixing ejector;
A liquid take-out means for taking out the liquid in which the gas in the sealed tank is dissolved from the liquid take-out port located below the gas-liquid mixing ejector, and
The closed tank has a gas chamber in which the upper gas is stored relative to the liquid chamber in which the lower liquid is stored.
The gas-liquid supply means allows the gas-liquid mixed jet flow ejected from the gas-liquid mixing ejector to be ejected from the liquid surface in the sealed tank to the gas chamber to be sprayed into the gas in the gas chamber. A pump for pressurizing the liquid supplied to the mixing ejector ;
A gas dissolution apparatus characterized in that in a gas chamber, the sprayed liquid comes into contact with the gas to promote the dissolution of the gas into the liquid . Liquid level detecting means for detecting a descent limit position of a liquid level that falls as the gas dissolution rate in the liquid decreases and the volume of the gas chamber increases as the gas dissolution concentration in the liquid in the sealed tank increases. When,
2. The gas according to claim 1, further comprising a control means for outputting a signal for stopping the supply of gas to the gas-liquid mixing ejector by detecting the lower limit position of the liquid level by the liquid level detecting means. Melting device. The gas dissolution apparatus according to claim 1 or 2, wherein the gas-liquid supply means pressurizes and supplies gas and liquid to the gas-liquid mixing ejector. Gas-liquid mixing ejector
A first ejector for sucking a gas supplied from the outside into a liquid flow generated by a liquid supplied under pressure and generating a gas-liquid mixed flow;
3. A second ejector for injecting a gas-liquid mixed flow obtained by sucking the liquid in the closed tank and adding the gas-liquid mixed flow discharged from the first ejector to the gas-liquid mixed flow. Gas dissolving device. The gas-liquid supply means includes a vortex pump that pressurizes and supplies the gas-liquid mixed flow to the gas-liquid mixing ejector by suctioning the gas together with the liquid and increasing the pressure while mixing and transferring the gas-liquid. Item 3. The gas dissolving device according to Item 1 or 2.

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