JP2021146282A - Device for and method of removing dissolved oxygen - Google Patents

Abstract

To provide a device for removing dissolved oxygen more easily, and inexpensively while exerting superior deaeration efficiency without increasing in size and cost of the device and provide a method of removing dissolved oxygen.SOLUTION: A device for removing dissolved oxygen is characterized by including: a liquid supply line 3 supplying a liquid to a fine bubble generator 2; a gas supply line 4 supplying an optional gas having the oxygen content rate of 10 vol% or less to the fine bubble generator; the fine bubble generator generating a fine bubble-containing liquid by making the liquid contain the above gas as a fine bubble; a separation vessel 5 separating a dissolved oxygen in the fine bubble-containing liquid; and a separation liquid supply line 6 connected to the separation vessel and supplying to outside, a separation liquid in which the above oxygen is separated.SELECTED DRAWING: Figure 1

Description

The present invention relates to an oxygen removing device and an oxygen removing method for removing oxygen dissolved in a liquid such as a beverage by using microbubbles.

Conventionally, as a method for removing dissolved oxygen in a liquid, "in a deoxidizing method for removing dissolved oxygen in a process liquid used in an industrial process, a vaporized gas of liquefied nitrogen is ejected into a liquid feeding path of the process liquid. After forming fine bubbles of nitrogen gas in the process liquid, this process liquid is made into a gas-liquid mixed fluid in a supersonic state, and the oxygen dissolved in the process liquid is absorbed into the nitrogen bubbles. "Method of deoxidizing from" is known (Patent Document 1).

In addition, as those using fine bubbles, "the first degassing step of degassing the beverage to reduce the concentration of dissolved gas, and the nitrogen bubble generation step of generating ultrafine bubbles with nitrogen gas in the degassed beverage. , A beverage manufacturing method including a heat sterilization step of heat sterilizing a beverage containing ultrafine bubbles by nitrogen gas ”is known (Patent Document 2).

These methods can perform degassing treatment more efficiently than existing degassing methods, but these methods require the process water to be a gas-liquid mixed fluid in a supersonic state, and with other dissolved oxygen removing devices. Since it is necessary to use the device together with the fine bubble generator, there are problems that the device is large and costly.

Japanese Unexamined Patent Publication No. 5-18481 JP-A-2018-102293

In view of the above-mentioned conventional drawbacks, the present invention provides a dissolved oxygen removing device and a dissolved oxygen removing method which are simpler, lower cost, and have excellent degassing efficiency without making the device large and costly. I am aiming.

In order to achieve the above object, the dissolved oxygen removing device according to claim 1 of the present invention has a liquid supply line for supplying a liquid to the fine bubble generator and an oxygen content of 10 vol% in the fine bubble generator. The gas supply line that supplies the following arbitrary gas, the fine bubble generator that generates the fine bubble-containing liquid by containing the gas as fine bubbles in the liquid, and the dissolved oxygen in the fine bubble-containing liquid. It is characterized by including a separation container for separating the gas and a separation liquid supply line which is connected to the separation container and supplies the separation liquid from which the dissolved oxygen is separated to the outside.

The fine bubbles of the dissolved oxygen removing device according to claim 2 are characterized in that the most frequent particle size in the particle size distribution based on the number is 1000 nm or less.
The dissolved oxygen removing device according to claim 3 is characterized in that the concentration of the fine bubbles contained in the fine bubble-containing liquid is 150 million cells / mL or more.

The dissolved oxygen removing device according to claim 4 further includes a circulation line in which the fine bubble-containing liquid in the separation container circulates, and the circulation line is provided in the middle of the circulation pipe and the circulation pipe. It is characterized in that it is composed of a circulation pump and a throttle portion provided in the circulation pipeline.

The fine bubble generator of the dissolved oxygen removing device according to claim 5 is a mixing fluid that supplies a mixer that mixes the gas and the liquid and a mixed fluid mixed by the mixer to a plurality of nozzles. A supply line and a booster pump that boosts at least either the liquid supplied from the liquid supply line or the mixed fluid mixed in the mixer are connected to the mixed fluid supply line and of the separation container. It is characterized in that it is provided in the liquid in a side-by-side state, and is composed of a plurality of nozzle portions that generate fine bubbles by injecting and shearing the pressurized mixed fluid.

The liquid of the dissolved oxygen removing device according to claim 6 is a beverage.
The liquid of the dissolved oxygen removing device according to claim 7 is boiler water.
The dissolved oxygen removing method according to claim 8 is a liquid supply step of supplying a liquid to the fine bubble generator and a gas supply step of supplying an arbitrary gas having an oxygen content of 10 vol% or less to the fine bubble generator. And the fine bubble-containing liquid generation step in which the gas supplied in the gas supply step is contained as fine bubbles in the liquid supplied in the liquid supply step, and the fine bubbles generated in the fine bubble-containing liquid generation step. The feature is that it is composed of a dissolved oxygen removing step of removing the oxygen dissolved inside the contained liquid.

The fine bubbles of the dissolved oxygen removing method according to claim 9 are characterized in that the most frequent particle size in the particle size distribution based on the number is 1000 nm or less.
The method for removing dissolved oxygen according to claim 10 is characterized in that the concentration of the fine bubbles contained in the fine bubble-containing liquid is 150 million cells / mL or more.
In the dissolved oxygen removing step of the dissolved oxygen removing method according to claim 11, a circulation step of circulating the fine bubble-containing liquid so that the dissolved oxygen concentration in the fine bubble-containing liquid becomes a predetermined concentration or less is performed. It is characterized by.
The liquid of the dissolved oxygen removing method according to claim 12 is a beverage.
The liquid of the dissolved oxygen removing method according to claim 13 is boiler water.

As is clear from the above description, the following effects can be obtained in the present invention.
(1) In each of the inventions according to claims 1 and 8, a more efficient deoxidizing treatment is performed by containing an arbitrary gas having an oxygen content of 10 vol% or less in the liquid in the state of fine bubbles. Can be done.
(2) Each of the inventions according to claims 2 and 9 also has the same effect as that of (1) above, and has a fine bubble having the most frequent particle size of 1000 nm or less in the particle size distribution based on the number of particles. As a result, the speed at which bubbles rise to the surface of the water can be extremely slowed down, and the amount of gas used can be reduced.
(3) Each of the inventions according to claims 3 and 10 can obtain the same effects as those in (1) and (2) above, and by increasing the concentration of fine bubbles, the efficiency of the deoxidizing treatment can be further improved. Can be high.
(4) The inventions according to claims 4 and 11 also have the same effects as those in (1) to (3) above, and circulate a liquid having a reduced dissolved oxygen concentration to further contain fine bubbles. Deoxidization treatment can be performed.
Therefore, the oxygen concentration in the liquid can be further reduced.
(5) Each of the inventions according to claim 5 can obtain the same effects as those in (1) to (4) above, and can more efficiently contain fine bubbles in the liquid.
(6) Each of the inventions according to claims 6 and 12 can obtain the same effects as those of (1) to (5) above, and can perform deoxidation treatment having a low risk in terms of food hygiene.
(7) Each of the inventions according to claims 7 and 13 can obtain the same effects as those in (1) to (5) above, and can prevent the boiler from corroding by removing the dissolved oxygen. ..

1 to 6 are explanatory views showing a first embodiment of the present invention.
7 and 8 are explanatory views showing a second embodiment of the present invention.
9 and 10 are explanatory views showing a third embodiment of the present invention.
The schematic explanatory view of the dissolved oxygen removal apparatus of 1st Embodiment. Explanatory drawing of the fine bubble generator. A reference explanatory view showing the inclination of the nozzle portion. (A) Explanatory drawing when the inclination of each of the opposing nozzle portions is 0 °. (B) Explanatory drawing when the inclination of one of the nozzle portions facing each other is 40 °. (C) Explanatory drawing when the facing nozzle portions are tilted by 20 ° in different directions and the fluids injected from the facing nozzle portions collide with each other at a tilt of 40 °. The reference explanatory view which shows the arrangement state of a nozzle part. (A) Explanatory drawing of the case where the central axes of the opposing nozzles are arranged so as to be coaxial (0 mm apart). (B) Explanatory drawing of the case (100 mm separation) when the central axes of the opposing nozzle portions are arranged so as to be separated by 100 mm. A table showing the relationship between the fine bubble concentration and the dissolved oxygen concentration. The process chart of the dissolved oxygen removal method of 1st Embodiment. The schematic explanatory view of the dissolved oxygen removal apparatus of 2nd Embodiment. The process chart of the dissolved oxygen removal method of 2nd Embodiment. The schematic explanatory view of the dissolved oxygen removal apparatus of 3rd Embodiment. The process chart of the dissolved oxygen removal method of 3rd Embodiment.

Hereinafter, the present invention will be described in detail in accordance with the embodiments shown in the drawings for carrying out the present invention.
In the first embodiment for carrying out the present invention shown in FIGS. 1 to 6, 1 uses the fine bubbles of the present invention, so-called microbubbles or ultrafine bubbles (UFB, bubbles having a diameter of 1 μm or less). It is a dissolved oxygen removing device that mainly removes dissolved oxygen in liquids such as beverages.

As shown in FIG. 1, the dissolved oxygen removing device 1 includes a liquid supply line 3 for supplying a liquid to the fine bubble generator 2 and an arbitrary gas having an oxygen content of 10 vol% or less for the fine bubble generator 2. And the liquid supplied from the liquid supply line 3, any gas having an oxygen content of 10 vol% or less supplied from the gas supply line 4 is contained as fine bubbles in the gas supply line 4 and the liquid supply line 3. The fine bubble generator 2 for generating the fine bubble-containing liquid, the separation container 5 for separating the dissolved oxygen in the fine bubble-containing liquid generated by the fine bubble generator 2, and the separation container 5 are connected to each other. The separated liquid supply line 6 for supplying the separated liquid from which the dissolved oxygen has been separated to the outside is included.

The liquid supply line 3 is a line that sends the liquid supplied from the liquid supply source 7 to the fine bubble generator 2.

The liquid supply source 7 supplies a liquid containing gas in the form of fine bubbles, and the liquid is preferably a beverage such as drinkable water or soft drink.

Further, when dissolved oxygen is present in the boiler water, the formation of a protective film is hindered, or the formation of an oxygen concentration cell or the like causes pitting corrosion. As described above, since the dissolved oxygen in the boiler water affects the corrosion of the boiler, it is also effective to supply the boiler water as a liquid from the liquid supply source 7 and remove the dissolved oxygen in the boiler water.

The liquid supply source 7 may be a tank or the like in which a liquid is stored, or in the case of water, a water pipe, a water storage tank, or other water purification device obtained from, for example, lake water, well water, river water, or seawater via a water purification device. The storage tank may be the liquid supply source 7.

The gas supply line 4 is a line that sends an arbitrary gas having an oxygen content of 10 vol% or less supplied from the gas supply source 8 to the fine bubble generator 2.
The gas supply source 8 is preferably a tank, a cylinder or the like, or a compressor or the like in the case of air.

Nitrogen gas is used as the gas that is the source of fine bubbles in this embodiment, but a gas such as air whose gas composition ratio is changed to 10 vol% or less with a rare gas, PSA, or the like. Can also be used.

The fine bubble generator 2 is connected to a liquid supply line 3 and a gas supply line 4, and mixes the supplied gas so as to be contained in the liquid as fine bubbles to generate a fine bubble-containing solvent to generate a separation container. It is a device that sends to 5 (secondary side).

As shown in FIG. 2, the fine bubble generator 2 includes, in the present embodiment, a mixer 9 that mixes the liquid supplied from the liquid supply line 3 with the gas supplied from the gas supply line 4, and the above. Either the mixed fluid supply line 11 that supplies the mixed fluid mixed by the mixer 9 to the plurality of nozzles 10 and at least the liquid supplied from the liquid supply line 3 or the mixed fluid mixed by the mixer 9. The booster pump 12 is connected to the mixed fluid supply line 11 and is provided in the liquid of the separation container 5 in a side-by-side state. It is composed of the plurality of nozzle portions 10 for generating air bubbles.

In the present embodiment, the separation container 5 is one of the elements constituting the fine bubble generator 2, but the separation container 5 may be provided separately from the fine bubble generator 2.

The mixer 9 is connected to the liquid supply line 3 and the gas supply line 4, and the supplied gas and liquid are mixed by the mixer 9 and sent to the secondary side (separation container 5 side).
The mixed fluid mixed by the mixer 9 is in a state of containing air bubbles of gas taken into the liquid supplied from the liquid supply line 3.

The mixed fluid supply line 11 is a line that connects the secondary side of the mixer 9 and the plurality of nozzles 10, and in the present embodiment, the mixed fluid supply line 11 is provided with a booster pump 12.

In the present embodiment, the booster pump 12 is provided on the secondary side of the mixer 9, that is, between the mixer 9 of the mixing fluid supply line 11 and the separation container 5, and the mixed fluid is at least 0.3 MPa. It boosts the pressure above.

The booster pump 12 used may be any one as long as it can boost the pressure of the liquid and pump it, and a known booster pump for liquid can be used.

The pressure of the liquid or mixed fluid after boosting using the booster pump 12 is preferably 0.3 MPa or more as described above, but even if it is less than 0.3 MPa, ultrafine bubbles are generated. Can be done.

The separation container 5 is a container-shaped member in the present embodiment, and can hold a liquid such as a liquid inside.
For example, a tubular discharge portion 13 is connected to the separation container 5 on the upper side thereof, and after a fine bubble-containing liquid is generated inside the separation container 5, oxygen degassed from the fine bubble-containing liquid is released. It is discharged to the outside from the discharge unit 13.

As shown in FIGS. 3 and 4, the nozzle portion 10 is provided in a side-by-side state in which the mixed fluid injected from the nozzle portion 10 is sheared, and is preferably arranged in a substantially opposed state.
Here, the side-by-side state includes a substantially opposed state, and the substantially opposed state means a state in which the central axes of the nozzle portions 10 are located on the same line and face each other, or a state in which the central axes are separated from each other. It includes the state of being placed.

In the present embodiment, the mixed fluid is provided in a substantially opposed state, and by injecting the mixed fluid boosted to a predetermined pressure supplied from the mixed fluid supply line 11 from the nozzle portion 10, the mixed fluid is in a sheared state. Ultrafine bubbles are generated in the liquid in the separation container 5.

Specifically, the nozzle portions 10 are arranged so as to substantially face each other including a straight line, and the injection direction can be inclined at an angle of 0 ° to 40 ° as shown in FIG. Here, 0 ° is an angle at which the central axis of one nozzle portion 10 and the central axis of the other nozzle portion 10 facing the nozzle are coaxial or parallel, and are in the plus / minus directions with respect to this 0 °. It is provided so that it can be tilted up to 40 ° (in the vertical direction on the drawing).

It is desirable to adjust this angle so that the angle formed by the opposing nozzle portions 10 is 40 ° at the maximum. For example, when the inclination of one nozzle portion 10 is 0 °, the angle of the other nozzle portion 10 is adjusted. The angle is adjusted to be 40 ° at the maximum (40 ° in the vertical direction), and when the inclination of one nozzle portion 10 is 20 °, the angle of the other nozzle portion 10 is opposite to that of the one nozzle portion 10. It is desirable to adjust so that the maximum inclination in the direction is 20 °.
That is, the angle of the opposing nozzle portions 10 is set so that the mixed fluids injected from the opposing nozzle portions 10 collide with each other at an inclination of 40 ° at the maximum.

Further, as shown in FIG. 4, the plurality of nozzle portions 10 facing each other can be installed so as to be separated from each other by 0 mm to 100 mm with respect to the central axis thereof. That is, the nozzle portions 10 are arranged facing each other with a range deviation of 0 mm or more and 100 mm or less from the straight line of the central axis.

By arranging in this way, the mixed fluids ejected from the nozzle portion 10 collide with each other or come close to each other and are efficiently sheared, so that ultrafine bubbles can be efficiently generated.

By the way, the maximum flow velocity when the mixed fluid at this time passes through the nozzle portion 10 is preferably 10 m / sec to 200 m / sec, and more preferably 50 m / sec to 150 m / sec.

When the particle size of the fine bubbles contained in the fine bubble-containing liquid is sufficiently small, the total surface area of the bubbles increases, and the dissolved oxygen in the liquid can be efficiently degassed.

Further, in the gas replacement by bubbling with bubbles having a large bubble diameter, the contact time between the gas supplied from the gas supply source 8 (nitrogen gas in this embodiment) and the liquid is short, so that the gas is supplied from the gas supply source 8. Since the bubbles burst at the liquid surface before the oxygen is sufficiently absorbed by the gas, the amount of gas supplied from the gas supply source 8 increases. By reducing the bubble diameter to the region of the ultrafine bubble, the speed at which the bubbles rise to the water surface becomes very slow, so that the amount of gas supplied from the gas supply source 8 used can be reduced.

In order to obtain such an action effect, the most frequent particle size in the particle size distribution based on the number of fine bubbles is preferably smaller than 1000 nm, and more preferably smaller than 500 nm.

Further, as shown in FIG. 5, the higher the volume ratio (higher concentration) of the gas per constant volume of the fine bubbles in the fine bubble-containing liquid, the higher the degassing efficiency of the dissolved oxygen in the liquid.

When the liquid is a beverage, the dissolved oxygen is preferably 1 ppm or less, and the content of the fine bubbles contained in the fine bubble-containing liquid generated by the fine bubble generator 2 is 1 mL of the liquid. It is preferable that there are 150 million or more per unit. Since nitrogen gas is used in this embodiment, safety can be enhanced.

In the separation container 5 of the fine bubble generator 2, the work of allowing the fine bubble-containing liquid to stand still to remove the dissolved oxygen in the fine bubble-containing liquid is performed. Oxygen dissolved in the fine bubble-containing liquid is adsorbed by the nitrogen gas in the form of fine bubbles, floats above the liquid, and is discharged to the outside from the discharge unit 13 provided in the separation container 5.

By the way, in the present embodiment, a circulation line 14 for circulating the fine bubble-containing liquid housed in the separation container 5 is provided, and the circulation line 14 is supplied with the separation container 5 or the separation liquid supply line 6 and the liquid supply. It is composed of a circulation pipe 15 connecting the line 3, a circulation pump 16 provided in the middle of the circulation pipe 15, and a throttle portion 17 for adjusting the flow rate in the circulation pipe 15.

By providing the circulation line 14, the liquid (fine bubble-containing liquid) in the separation container 5 can be returned to the liquid supply line 3 (upstream of the mixer 9) and circulated, and the dissolved oxygen concentration is reduced. Since the liquid can be circulated and a gas can be further mixed with the fine bubble-containing liquid to contain high-concentration fine bubbles, the dissolved oxygen concentration in the liquid can be further reduced. It is also possible to efficiently improve the concentration of fine bubbles.

Since the circulation line is provided with the throttle portion 17, the flow rate of the fine bubble-containing liquid can be adjusted by the opening degree of the throttle portion 17, and the dissolved oxygen concentration in the fine bubble-containing liquid can be adjusted.

The separation solution from which the dissolved oxygen has been removed is provided to the outside by the separation liquid supply line 6 connected to the separation container 5. It is desirable that the separation liquid supply line 6 is provided with a sluice valve 18.

As shown in FIG. 6, the dissolved oxygen removing method 19 of the present invention includes a liquid supply step 20 for supplying a liquid to the fine bubble generator 2 and generating the fine bubbles of any gas having an oxygen content of 10 vol% or less. The gas supply step 21 supplied to the apparatus 2 and any gas having an oxygen content of 10 vol% or less supplied in the gas supply step 21 are contained as fine bubbles in the liquid supplied in the liquid supply step 20. It is composed of a fine bubble-containing liquid generation step 22 for causing the fine bubble-containing liquid to be generated, and a dissolved oxygen removing step 23 for removing the oxygen dissolved inside the fine bubble-containing liquid generated in the fine bubble-containing liquid generation step 22.

The liquid supply step 20 is a step of supplying the liquid supplied from the liquid supply source 7 to the fine bubble generator 2 via the liquid supply line 3. Various liquids can be considered as the liquid, but in the present embodiment, a beverage such as water or soft drink is used as the liquid.

The gas supply step 21 is a step of supplying the gas supplied from the gas supply source 8 to the fine bubble generator 2 via the gas supply line 4. As the gas to be supplied, any gas having an oxygen content of 10 vol% or less is used, and in this embodiment, nitrogen gas is used. It should be noted that a gas such as air whose gas composition ratio is changed to 10 vol% or less with a noble gas or PSA can also be used.

The liquid supply step 20 and the gas supply step 21 are performed substantially at the same time, but one of the steps may be performed first.

In the fine bubble-containing liquid generation step 22, the fine bubble generator 2 is used to add gas to the liquid in the state of fine bubbles to generate the fine bubble-containing liquid.

The dissolved oxygen removing step 23 is a step of storing the fine bubble-containing liquid in the separation container 5 and adsorbing the dissolved oxygen by the fine bubbles to reduce the dissolved oxygen concentration of the fine bubble-containing liquid to a predetermined concentration or less. In the present embodiment, since the separation container 5 and the container for producing the fine bubble-containing liquid are the same, the dissolved oxygen removing step 23 is started substantially at the same time as the fine bubble-containing liquid generation step 22.

The dissolved oxygen concentration of the fine bubble-containing liquid differs depending on the liquid, but in the case of a beverage, for example, it is desirable that the dissolved oxygen concentration is 1 ppm or less, and the dissolved oxygen concentration is fine so as to be equal to or less than this dissolved oxygen concentration. It contains air bubbles and separates dissolved oxygen in a separation container.

In the present embodiment, in the dissolved oxygen removing step 23, the circulation step 24 is performed in which the liquid in the separation container 5 is circulated by the circulation line 14 to reduce the dissolved oxygen concentration.

In this circulation step 24, the dissolved oxygen is separated in the separation container 5, the fine bubble-containing liquid having a reduced dissolved oxygen concentration is circulated to the liquid supply line 3, the gas is remixed in the mixer 9, and the gas is mixed again from the nozzle portion 10. By injecting the liquid, the dissolved oxygen concentration can be further reduced by further containing the high-concentration fine bubbles in the fine bubble-containing liquid having a reduced dissolved oxygen concentration.

The separated liquid having the dissolved oxygen concentration set to a predetermined value or less in the dissolved oxygen removing step 23 is provided to the outside via the separated liquid supply line 6 or the like.

[Different forms for carrying out the invention]
Next, different modes for carrying out the present invention shown in FIGS. 7 to 10 will be described. In the description of these different embodiments for carrying out the present invention, the same components as those of the first embodiment for carrying out the present invention are designated by the same reference numerals, and duplicate description will be omitted.

The second mode for carrying out the present invention shown in FIGS. 7 and 8 is mainly different from the first mode for carrying out the present invention by using a known fine bubble generator 2A. The dissolved oxygen removing device 1A that supplies the fine bubble-containing liquid to the separation container 5 via the fine bubble-containing liquid supply line 25 connected to the fine bubble generator 2A is used, and fine bubbles are generated after the fine bubble-containing liquid generation step 22. In terms of the dissolved oxygen removing method 19A in which the dissolved oxygen removing step 23A for removing the dissolved oxygen is performed in the separation container 5 independent of the device 2A, such a dissolved oxygen removing device 1A and the dissolved oxygen removing method 19A are used. The same action and effect as in the first embodiment for carrying out the present invention can be obtained.

In addition, the separation container 5 of the present embodiment can store the fine bubble-containing liquid containing fine bubbles in the fine bubble generator 2A, and adsorbs dissolved oxygen to the fine bubbles to perform deoxidation treatment. No nozzle portion 10 or the like is provided inside the separation container 5.

In the second embodiment for carrying out the present invention shown in FIGS. 9 and 10, the main difference from the first embodiment for carrying out the present invention is that a known fine bubble generator 2A is used and the known fine bubble generator 2A is used. Such a dissolved oxygen removing device 1B and a dissolved oxygen are used in that the dissolved oxygen removing device 1B having no circulation line 14 and the dissolved oxygen removing method 19B including the dissolved oxygen removing step 23B not performing the circulation step 24 are used. Even with the removal method 19B, the same action and effect as in the first embodiment for carrying out the present invention can be obtained.

The present invention is used in the industry of removing dissolved oxygen in a liquid using fine bubbles.

1, 1A, 1B: Dissolved oxygen device, 2, 2A: Fine bubble generator,
3: Liquid supply line, 4: Gas supply line,
5: Separation container 5: Separation liquid supply line,
7: Liquid source, 8: Gas source,
9: Mixer, 10: Nozzle part,
11: Mixed fluid supply line, 12: Booster pump,
13: Discharge section, 14: Circulation line,
15: Circulation pipeline, 16: Circulation pump,
17: Squeeze part, 18: Gate valve,
19, 19A, 19B: Dissolved oxygen removal method,
20: Liquid supply process, 21: Gas supply process,
22: Fine bubble-containing liquid generation step,
23, 23A, 23B: Dissolved oxygen removal step,
24: Circulation process, 25: Liquid supply line containing fine bubbles.

Claims (13)

A liquid supply line that supplies a liquid to the fine bubble generator, a gas supply line that supplies an arbitrary gas having an oxygen content of 10 vol% or less to the fine bubble generator, and the liquid containing the gas as fine bubbles. By doing so, the fine bubble generator that generates the fine bubble-containing liquid, the separation container that separates the dissolved oxygen in the fine bubble-containing liquid, and the separation liquid that is connected to the separation container and separates the dissolved oxygen. Dissolved oxygen scavenger including a separate liquid supply line to supply to the outside. The dissolved oxygen removing device according to claim 1, wherein the fine bubbles have a most frequent particle size of 1000 nm or less in a particle size distribution based on the number of fine cells. The dissolved oxygen removing device according to claim 1 or 2, wherein the concentration of the fine bubbles contained in the fine bubble-containing liquid is 150 million cells / mL or more. A circulation line for circulating the fine bubble-containing liquid in the separation container is further provided, and the circulation line is provided in the circulation pipe, a circulation pump provided in the middle of the circulation pipe, and the circulation pipe. The dissolved oxygen removing device according to any one of claims 1 to 3, further comprising a squeezing portion. The fine bubble generator is supplied from a mixer that mixes the gas and the liquid, a mixed fluid supply line that supplies the mixed fluid mixed by the mixer to a plurality of nozzles, and at least the liquid supply line. A booster pump for boosting either the liquid or the mixed fluid mixed in the mixer is connected to the mixed fluid supply line, and is provided in the liquid of the separation container in an annexed state to boost the pressure. The dissolved oxygen removal according to any one of claims 1 to 4, wherein the mixed fluid is composed of the plurality of nozzles for generating fine bubbles by injecting and shearing the mixed fluid. Device. The dissolved oxygen removing device according to any one of claims 1 to 5, wherein the liquid is a beverage. The dissolved oxygen removing device according to any one of claims 1 to 5, wherein the liquid is boiler water. A liquid supply step of supplying a liquid to the fine bubble generator, a gas supply step of supplying an arbitrary gas having an oxygen content of 10 vol% or less to the fine bubble generator, and the liquid supplied in the liquid supply step. The oxygen dissolved inside the fine bubble-containing liquid generated in the fine bubble-containing liquid generation step and the fine bubble-containing liquid generation step in which the gas supplied in the gas supply step is contained as fine bubbles is removed. A method for removing dissolved oxygen, which comprises a step of removing dissolved oxygen. The dissolved oxygen removing method according to claim 8, wherein the fine bubbles have a most frequent particle size of 1000 nm or less in a particle size distribution based on the number of fine cells. The dissolved oxygen removing method according to claim 8, wherein the concentration of the fine bubbles contained in the fine bubble-containing liquid is 150 million cells / mL or more. Claims 8 to 10 are characterized in that the dissolved oxygen removing step is a circulation step of circulating the fine bubble-containing liquid so that the dissolved oxygen concentration in the fine bubble-containing liquid is equal to or less than a predetermined concentration. Dissolved oxygen removal method according to any one of. The method for removing dissolved oxygen according to any one of claims 8 to 11, wherein the liquid is a beverage. The method for removing dissolved oxygen according to any one of claims 8 to 11, wherein the liquid is boiler water.

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