JP5985270B2 - Gas dissolver for liquid - Google Patents

Description

  The present invention relates to an apparatus for dissolving a gas in a liquid, and more particularly to an apparatus for dissolving a gas in a liquid for dissolving the gas in the liquid by bringing the gas such as air into contact with the liquid such as water. .

For some time, gas dissolving apparatuses for liquids have been used in various fields (see, for example, Patent Document 1).
Patent Document 1 states, “A first object is to provide a gas-liquid dissolution apparatus capable of sufficiently dissolving a gas such as ozone in water to be treated. By using this gas-liquid dissolution apparatus, water treatment is performed. The second object is to provide a water treatment system and a water treatment method capable of greatly improving performance "(paragraph number 0005 of Patent Document 1). , “Injecting means for injecting gas into the water to be treated, pressurizing means for pulverizing the injected gas to form fine bubbles in the water to be treated, and pressure-feeding the water to be treated,” A first reaction tank that stirs the pumped water to be treated and a second reaction tank that retains the water to be treated discharged from the first reaction tank for a predetermined time ”(Patent Document 1). Paragraph number 0006) by "injected After the body is pressurized while being made into fine bubbles, the water to be treated is stirred in the first reaction tank, so that most of the fine bubbles can be dissolved in the water to be treated in the first reaction tank. Then, if the water to be treated in which such a gas is dissolved stays in the second reaction tank for a predetermined time, the gas is surely dissolved, and the injected gas is almost completely dissolved at this point in time ”(patent It is called paragraph number 0007) of document 1.

Japanese Patent Application Laid-Open No. 2004-313847 (for example, paragraph numbers 0004 to 0007 in the summary and detailed description of the invention, FIGS. 1 and 2, etc.)

The gas-liquid dissolution apparatus of Patent Document 1 (the gas dissolution apparatus in the liquid according to the present invention) has an injection means, a pressurization means, a first reaction tank, and a second reaction tank, and has a complicated structure. This may cause problems such as high costs for manufacturing and operation and maintenance, and a large space for installation.
Therefore, an object of the present invention is to provide an apparatus for dissolving a gas into a liquid that has a simple structure and can effectively dissolve the gas into the liquid.

  An apparatus for dissolving a gas in a liquid according to the present invention (hereinafter referred to as “the present apparatus”) is a first channel having a lower end along the vertical direction and a first position that is different with respect to the vertical direction of the first channel. A communication channel for communicating the upper position with the first lower position, a liquid supply means for supplying a liquid to a supply position existing in the communication channel, a liquid extraction means for extracting liquid from an extraction position existing in the communication channel, When the gas is blown into the blowing position, which is the position of the first flow path below the upper position, the rising force of bubbles formed in the liquid in the first flow path causes the first flow path and the communication flow path. And a blowing means for forming a circulating flow through which the liquid circulates in the circulation flow path, and after the circulating flow passes through the extraction position from the blowing position, it further passes through the supply position and returns to the blowing position again. Is a device for dissolving gas in liquid A.

The apparatus includes a first flow path, a communication flow path, a liquid supply means, a liquid extraction means, and a blowing means.
The first channel is a channel along the vertical direction, and the lower end is closed (the liquid cannot pass through the lower end).
The communication channel connects the first upper position and the first lower position existing in the first channel. The first upper position and the first lower position are different positions with respect to the vertical direction of the first flow path, and are along the first flow path when the fluid (liquid, gas) flows along the first flow path. Two different positions.
The liquid supply means supplies a liquid (a liquid serving as a raw material in which a gas is to be dissolved) to a supply position existing in the communication channel.
The liquid extraction means extracts liquid from the extraction position existing in the communication channel.
The blowing means blows gas into a blowing position that is a position existing in the first flow path. The blowing position is a position existing in the first flow path and a position below the first upper position. The gas blown into the blowing position of the first flow path by the blowing means forms bubbles in the liquid existing in the first flow path, and the bubbles rise in the liquid from the blowing position toward the first upper position. Due to the rising force of the bubbles from the blowing position toward the first upper position, the liquid existing around the bubbles also flows from the blowing position toward the first upper position and further flows into the communication channel from the first upper position (after that) The liquid flowing along the communication channel flows into the first lower position of the first channel), and a circulation flow is formed in which the liquid circulates through the circulation channel including the first channel and the communication channel.

In this apparatus, the circulating flow in which the liquid circulates in the circulation flow path including the first flow path and the communication flow path passes through the extraction position from the blowing position, and further passes through the supply position to return to the blowing position again. To be done. As a result, the liquid supplied to the supply position of the communication channel by the liquid supply means (liquid having a low dissolved concentration of gas) comes into contact with the gas blown at the blowing position of the first flow path by the blowing means. After the gas is dissolved in the liquid, the liquid in which the gas is dissolved is extracted from the extraction position of the communication flow path by the liquid extraction means (the extracted liquid is a part of the liquid forming the circulation flow, and the remainder is supplied. The liquid supplied at the position merges and returns to the blowing position). That is, by arranging the blowing position, the extracting position, and the supply position in the circulating flow as described above, the liquid supplied by the liquid supply means with a small amount of dissolved gas does not contact the gas blown by the blowing means. Extraction from the liquid extraction means can be prevented or reduced, whereby a liquid in which gas is sufficiently dissolved can be stably obtained. As described above, the apparatus includes a circulation channel including the first channel and the communication channel, a liquid supply unit that supplies the liquid to the communication channel, a liquid extraction unit that extracts the liquid from the communication channel, and the first flow. A gas dissolving apparatus for a liquid, which has a simple structure and can effectively dissolve the gas into the liquid.
The liquid and gas in this apparatus are not particularly limited as long as the gas is dissolved in the liquid by contacting the liquid, but examples of (liquid, gas) include (water, air), ( Water, oxygen), (water, nitrogen), (water, carbon dioxide), (water, chlorine), etc. can be exemplified (water here refers to a liquid containing water, such as pure water or purified water) Not only things but also seawater, sewage, drinking water, etc.)

In this apparatus, the blowing means includes a partition plate that partitions the lower space existing below the first lower position of the first flow path and the first flow path so that gas can pass therethrough, and a pressure feed that pumps the gas to the lower space. And means.
By doing so, the partition plate partitions the first flow path and the lower space existing below the first lower position of the first flow path so that gas can pass therethrough. And since a pumping means pumps gas to lower space, the gas with which lower space was inserted passes a partition plate, and flows in into a 1st flow path. In this way, a partition plate (for example, a partition plate formed by dispersing a large number of small holes) in which the gas is well dispersed by allowing the gas to flow through the partition plate and flow into the first flow path. By using it, the gas flows into the first flow path in a well-distributed state, so that the liquid effectively contacts the gas blown by the blowing means to form a liquid in which the gas is sufficiently dissolved. it can.

In the present apparatus, the discharge direction of the liquid supplied by the liquid supply means at the supply position may be substantially coincident with the flow direction at the supply position of the circulating flow.
In this way, when the liquid supplied by the liquid supply unit joins the circulation flow at the supply position, the liquid discharge direction by the liquid supply unit substantially coincides with the flow direction of the circulation flow. Supply can be performed smoothly and easily.
Note that the liquid discharge direction substantially coincides with the flow direction of the circulating flow is that the angle formed by the vector indicating the liquid discharge direction and the vector indicating the flow direction of the circulating flow is preferably 20 degrees or less. , More preferably 10 degrees or less, and most preferably 5 degrees or less.

In the present apparatus, the first upper position may be the closed upper end of the first flow path.
In this way, after the bubbles formed by the gas blown into the blowing position of the first flow path by the blowing means and the liquid accompanying the bubbles reach the first upper position, the liquid is accompanied by the bubbles and the first Since the liquid smoothly flows from the upper position into the communication channel, a smooth circulation flow in which the liquid circulates through the circulation channel including the first channel and the communication channel is easily formed. With this smooth circulation flow, the apparatus can be operated easily and stably, and the gas can be stably dissolved in the liquid.

This apparatus may be provided with an opening means for opening the upper surface of the liquid forming the circulation flow (hereinafter referred to as “opening apparatus equipped with this apparatus”).
The gas blown into the blowing position by the blowing means forms bubbles in the liquid, and the bubbles rise with the liquid from the blowing position toward the first upper position, whereby the first flow path and the communication flow A circulation flow in which the liquid circulates through the circulation flow path including the path is formed. For this reason, in order to obtain a sufficient circulation flow rate, it is necessary to sufficiently blow in the gas by the blowing means, but the gas that has not been dissolved in the liquid other than the gas dissolved in the liquid remains. If this residual gas is held in the circulation channel as it is, the pressure of the circulation channel becomes high, which may cause problems such as the operation of the apparatus becoming difficult, so the upper surface of the liquid forming the circulation flow is opened. By providing an opening means, residual gas that did not dissolve in the liquid may be released from the opening means, and then the amount of gas necessary to obtain a sufficient circulation flow rate is freely blown be able to.

In the case of this apparatus having an opening means, the communication flow path is formed along the vertical direction, includes a second flow path whose upper end is open and whose lower end is closed, and is in a different position with respect to the vertical direction of the second flow path. The second upper position communicates with the first upper position among the second upper position and the second lower position existing below the upper end, and the second lower position communicates with the first lower position. The opened upper end may form an opening means (hereinafter referred to as “the second flow path equipped apparatus”).
In this way, the second flow path included in the communication flow path is formed along the vertical direction, and the upper end is opened and the lower end is closed (the liquid cannot pass through the lower end). The second flow path has a second upper position (the second upper position is below the upper end of the second flow path) and a second lower position, and the second upper position and the second lower position. The positions are different positions with respect to the vertical direction of the second flow path, and are two different positions along the second flow path when the fluid (liquid, gas) flows along the second flow path. Since the second upper position communicates with the first upper position and the second lower position communicates with the first lower position, bubbles formed by the gas blown by the blowing means are moved from the blowing position to the first upper position. The liquid rises with the liquid toward the position and reaches the first upper position, and then the liquid flows from the first upper position to the second upper position of the second flow path along with the bubbles. The mixed flow of the liquid and the bubbles flowing into the second channel partly causes gas-liquid separation, the gas forming the bubbles is released from the upper surface of the liquid, and the upper end of the second channel opened Exhausted from. If such a second flow path having an open upper end is formed (the open upper end of the second flow path forms an opening means), the opening means need not be specially configured, and the configuration of the apparatus can be simplified. Can be.

In the present apparatus with the second flow path, the extraction position may be between the second upper position and the second lower position (hereinafter referred to as “second flow path extraction main apparatus”).
In this way, a part of the bubbles constituting the mixed flow of the liquid and the bubbles flowing into the second flow path is separated into gas and liquid and disappears (the gas forming the part is the upper surface of the liquid). And the remaining part of the bubbles constituting the mixed flow is in a direction from the second upper position to the second lower position along with the circulation flow. Flow together. The gas is further dissolved in the liquid by the gas-liquid contact in the flow process of the liquid and the bubbles from the second upper position toward the second lower position. For this reason, it is possible to extract the liquid in which the gas is further dissolved in the flow process from the second upper position to the second lower position by providing the liquid extraction position by the liquid extraction means from the second upper position to the second lower position. And a liquid having a high gas dissolution concentration can be obtained.
Note that when the flow path length of the second flow path from the second upper position to the second lower position is L1, and the flow path length from the second upper position to the extraction position is L2, (L2 / L1) is preferably 0.4 or more, more preferably 0.5 or more, and most preferably 0.6 or more (of course, the upper limit is 1).

In the case of the second flow path extraction apparatus, the communication flow path includes a lower communication flow path that connects the second lower position and the first lower position, and the supply position is the second lower position and the first lower position. It may exist between.
By doing so, the lower communication flow path included in the communication flow path connects the second lower position and the first lower position, and the supply position exists between the second lower position and the first lower position. 2 It is possible to sufficiently separate both the extraction position existing between the upper position and the second lower position and the supply position existing between the second lower position and the first lower position, and the amount of dissolved gas is small. The liquid supplied to the supply position by the liquid supply means can be effectively prevented or reduced from being extracted from the extraction position by the liquid extraction means without contacting the gas blown by the blowing means, thereby A liquid in which the gas is sufficiently dissolved can be obtained more stably.
Note that if the flow path length of the lower communication flow path from the second lower position to the first lower position is L3 and the flow path length from the second lower position to the supply position is L4, (L4 / L3) is preferably It is 0.1 or more, more preferably 0.2 or more, and most preferably 0.3 or more (of course, the upper limit is 1).

In this apparatus, the liquid extraction means includes an extraction flow path whose lower end communicates with the extraction position and whose upper end is opened, and the liquid in the extraction flow path overflows from the upper end of the extraction flow path. May be extracted.
In this way, if the liquid exceeds the upper end of the extraction flow path, the liquid overflows and is extracted from the upper end of the extraction flow path, so that it is possible to control the circulation flow without taking special measures such as controlling the liquid extraction amount. Liquid can be withdrawn to maintain the pressure in the channel within a certain range. In addition, if the upper end of the extraction flow path is too lower than the upper surface of the liquid in the circulation flow path, the circulation flow in the circulation flow path cannot be formed well, and if it is too high, the pressure in the circulation flow path becomes too high. What is necessary is just to make it the height which is compatible with these both.

In this apparatus, the liquid supply means includes a supply channel whose lower end communicates with the supply position and whose upper end is opened, and the supply of the communication channel by gravity to the liquid by supplying the liquid to the supply channel. The liquid may be supplied to the position.
By supplying the liquid to the supply flow path in this way, the liquid is supplied to the supply position of the communication flow path due to gravity (liquid height) on the liquid, so that a special means for pumping the liquid to the supply position (For example, a pump) is not required. If the upper end of the supply flow path is lower than the upper surface of the liquid in the circulation flow path, the liquid height for supplying the liquid cannot be secured, and if it is too high, the pressure in the circulation flow path becomes too high. It is only necessary that the height be compatible.

It is a conceptual diagram which shows the gas dissolving apparatus (this apparatus) which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited by these.

FIG. 1 is a conceptual diagram showing a gas dissolving apparatus (present apparatus) 1 according to an embodiment of the present invention. The apparatus 1 will be described with reference to FIG.
The apparatus 1 roughly includes a first pipe 11, a second pipe 21, a third pipe 31, a fourth pipe 41, a raw water injection part 51, a gas dissolved water extraction part 71, and a dispersion plate. 61. Here, this apparatus 1 receives the seawater pumped from the sea by the pump 57 and pressurizes the seawater with the air pressurized by the compressor 64 (compressor), thereby increasing the dissolved oxygen concentration in the water. For generating treated water. In addition, the treated water which raised the dissolved oxygen concentration here is used for aquaculture of fish (specifically, Japanese flounder).

  The first pipe 11, the second pipe 21, the third pipe 31, and the fourth pipe 41 are all formed by cylindrical plastic pipes having the same inner diameter (specifically, an inner diameter of 107 mm). Both (the length of about 1600 mm) and the second pipe 21 (the length of about 1900 mm) are erected in the vertical direction, the third pipe 31 (the length of about 230 mm) and the fourth pipe 41 (the length of about 230 mm) are arranged in the horizontal direction (in the figure, the vertical direction is indicated by an arrow A and the horizontal direction is indicated by an arrow B). The central axes of the first pipe 11, the second pipe 21, the third pipe 31, and the fourth pipe 41 (the cylindrical central axes formed by the internal spaces 11c, 21c, 31c, and 41c of the pipes) belong to one plane ( FIG. 1 shows a cross section taken along one plane), the central axes of the first pipe 11 and the second pipe 21 are substantially parallel to each other, and the central axes of the third pipe 31 and the fourth pipe 41 are substantially parallel to each other. Each pipe 11, so that the central axis (here vertical) of the first pipe 11 and the second pipe 21 and the central axis (here horizontal) of the third pipe 31 and the fourth pipe 41 intersect substantially perpendicularly. 21, 31, 41 are arranged.

The first pipe 11 and the third pipe 31 are connected so that the upper end of the internal space 11c of the first pipe 11 and one end of the internal space 31c of the third pipe 31 communicate (the upper end of the first pipe 11). And the bottom are closed). The first pipe 11 and the fourth pipe 41 are connected so that the vicinity of the lower end of the internal space 11c of the first pipe 11 communicates with one end of the internal space 41c of the fourth pipe 41.
A dispersion plate 61 is disposed below the position where one end of the internal space 41 c of the fourth pipe 41 communicates in the internal space 11 c of the first pipe 11. The dispersion plate 61 is formed by a disk-shaped plastic plate member (thickness of about 3 mm) whose main surfaces (upper surface and lower surface) are circular, and the outer peripheral edge of the dispersion plate 61 is the inner periphery of the first pipe 11. It is liquid-tight and air-tightly attached to the peripheral surface. The dispersion plate 61 has a large number of through holes that allow the upper surface and the lower surface to communicate with each other. Specifically, a vertical parallel line formed at an interval of 7 mm on the upper surface of the dispersion plate 61 and a horizontal parallel line formed at an interval of 7 mm perpendicular to the vertical parallel line on the upper surface of the dispersion plate 61 are considered. Circular through-holes with a diameter of 3.5 mm centering on the intersections of the vertical and horizontal parallel lines are formed from the upper surface to the lower surface.
A gas chamber 65 is formed in the internal space 11c of the first pipe 11 below the dispersion plate 61 (between the closed lower end of the first pipe 11 and the lower surface of the dispersion plate 61). The air pressurized by the compressor 64 is flow-controlled by the flow control valve 66 and introduced into the gas chamber 65, so that the pressurized air introduced into the gas chamber 65 passes through the numerous through holes of the dispersion plate 61. After that, small bubbles 81 are formed in the water 91.

The second pipe 21 is open to the outside 101 at a position where the upper end is higher than the upper end of the first pipe 11 (here, the upper end of the second pipe 21 is about 300 mm higher than the upper end of the first pipe 11). The lower end is closed at substantially the same height as the lower end of the first pipe 11. The second pipe 21 and the fourth pipe 41 are connected so that the vicinity of the lower end of the internal space 21c of the second pipe 21 and the other end of the internal space 41c of the fourth pipe 41 communicate with each other. The second pipe so that the upper end of the internal space 21c of the second pipe 21 (at least above the position communicating with the internal space 41c of the fourth pipe 41) communicates with the other end of the internal space 31c of the third pipe 31. 21 and the third pipe 31 are connected.
Of the internal space 21c of the second pipe 21, between the position communicating with the internal space 41c of the fourth pipe 41 and the position communicating with the internal space 31c of the third pipe 31, gas dissolved water to be described later is extracted. An outlet 24 for water 91 to the portion 71 is formed.
In addition, here, the water injection pipe 53 passes through the second pipe 21 so that the tip 53a of the water injection pipe 53 of the raw material water injection part 51 described later is positioned in the internal space 41c of the fourth pipe 41 (of course, The portion C where the water injection pipe 53 penetrates the wall of the second pipe 21 is attached in a liquid-tight manner).

  As described above, the raw water injection part 51 is for injecting seawater pumped from the sea by the pump 57 and controlled in flow rate by the flow rate control valve 58 into the internal space 41 c of the fourth pipe 41. The raw water injection part 51 roughly includes a raw water holding pipe 55 whose upper end is opened, and a water injection pipe 53 attached so that the base end communicates with the lower end of the raw water holding pipe 55. . The raw material water holding pipe 55 is formed of a straight cylindrical pipe standing upright in a substantially vertical direction, and receives the seawater whose flow rate is controlled by the flow rate control valve 58 at the open upper end. Seawater received in the raw water holding pipe 55 is sent to the water injection pipe 53 by the pressure due to the liquid height, and is injected into the internal space 41 c of the fourth pipe 41 from the tip 53 a of the water injection pipe 53. The direction of water injection from the tip 53a of the water injection pipe 53 is the direction from the second pipe 21 side to the first pipe 11 side (in the direction of arrow D in FIG. 1; here, it is substantially the same as the central axis of the fourth pipe 41). Furthermore, the tip 53a is substantially on the central axis of the fourth pipe 41.) and substantially coincides with the direction in which the water 91 flows in the internal space 41c of the fourth pipe 41. Therefore, smooth injection can be performed (the flow of the water 91 in the internal space 41 c of the fourth pipe 41 acts to suck out water from the tip 53 a of the water injection pipe 53).

The gas-dissolved water extraction portion 71 is for extracting water 91 in which air is dissolved by coming into contact with small bubbles 81 generated from a large number of through holes of the dispersion plate 61, and is roughly formed in the second pipe 21. An extraction pipe 73 attached to one end of the extraction outlet 24 and a vertical pipe 75 attached to the other end of the extraction pipe 73 so as to communicate with the lower end thereof (in this case, standing up in a substantially vertical direction) A straight cylindrical pipe) and a horizontal pipe 77 attached in the vicinity of the open upper end of the vertical pipe 75.
The water 91 flowing out from the outlet 24 of the second pipe 21 into the extraction pipe 73 rises upward from the lower end of the vertical pipe 75 and overflows from the horizontal pipe 77 (arrow E in FIG. 1). The overflowed water comes into contact with a large number of small air bubbles 81 so that the air is sufficiently dissolved, and can be suitably used for fish farming and the like.

The operation method of the apparatus 1 will be briefly described.
The seawater is previously pumped from the sea by the pump 57, injected into the fourth pipe 41 internal space 41c through the raw material water injection part 51, and the upper side existing above the upper surface of the dispersion plate 61 in the internal space 11c of the first pipe 11 The internal space 11cd, the internal space 21c of the second pipe 21, the internal space 31c of the third pipe 31, and the internal space 41c of the fourth pipe 41 are filled with water 91 (here, seawater) to the extent shown in FIG. To do.
Then, the compressor 64 is started and the pressurized air is introduced into the gas chamber 65 while the flow rate is controlled by the flow rate control valve 66. As a result, the pressurized air introduced into the gas chamber 65 forms a large number of small bubbles 81 in the water 91 through the numerous through holes of the dispersion plate 61. Many small bubbles 81 in the water 91 rise in the water 91. As the bubbles 81 rise in the water 91, the water 91 existing in the upper internal space 11 cd of the first pipe 11 is moved upward (the third pipe 31 side), and the bubbles 81 are formed by the contact between the bubbles 81 and the water 91. Air dissolves in water 91 (resulting in an increase in dissolved oxygen in water 91).

The mixture of the water 91 and the bubbles 81 that has reached the upper end of the upper internal space 11cd of the first pipe 11 flows in the internal space 31c of the third pipe 31 from one end to the other end, and into the second pipe 21 internal space 21c. Inflow. The mixture that has flowed into the internal space 21 c of the second pipe 21 is partly gas-liquid separated, and the air forming the separated bubbles 81 is exhausted from the open upper end of the second pipe 21. Among the mixture, the bubbles 81 and the water 91 that have not been subjected to gas-liquid separation flow downward (in the fourth pipe 41 side) through the internal space 21c of the second pipe 21 with the bubbles 81 (the second pipe 21). The bubbles 81 entrained by the water 91 flowing downward in the internal space 21c have many fine bubbles (easily soluble in water), and the air is further dissolved in the water 91 by this downward flow process (further dissolved). Resulting in increased oxygen concentration).
A part of the water 91 that has reached the position of the outlet 24 of the second pipe 21 (the air is sufficiently dissolved) flows out to the extraction pipe 73, and the water 91 that has flowed out to the extraction pipe 73 is the vertical pipe 75. It rises upward from the lower end of the pipe, overflows from the horizontal pipe 77, and is used for fish farming and the like. The remaining water 91 that has not flowed into the extraction pipe 73 further flows downward in the second pipe 21 internal space 21c, and flows in the internal space 41c of the fourth pipe 41 from the other end to one end. When the water 91 flows from the other end to the one end in the internal space 41 c of the fourth pipe 41, the water 91 joins and is mixed with the raw water (low dissolved oxygen) ejected from the tip 53 a of the water injection pipe 53.
Then, the water 91 that has flowed into the upper internal space 11cd of the first pipe 11 from one end of the internal space 41c of the fourth pipe 41 comes into contact with a large number of small bubbles 81 generated from the numerous through holes of the dispersion plate 61 as described above. As a result, air is dissolved in the water 91, and the upper internal space 11cd of the first pipe 11 is moved upward by the rising of the bubbles 81. Thereafter, this operation is repeated.

As described above, in the present apparatus 1, the raw water injected from the tip 53 a of the water injection pipe 53 by the raw water injection unit 51 is mixed with the water 91 that moves from the other end of the internal space 41 c of the fourth pipe 41 to one end. The mixed water flows into the upper internal space 11cd of the first pipe 11 and comes into contact with a large number of small bubbles 81 from the dispersion plate 61 in the first internal space 11cd of the first pipe 11. As 81 rises, the upper internal space 11cd of the first pipe 11 is moved upward. Due to the rising of the water 91 in the upper internal space 11 cd of the first pipe 11 by the bubbles 81, the water 91 becomes the upper internal space 11 cd (upward flow) of the first pipe 11, the internal space 31 c (horizontal flow) of the third pipe 31, The internal space 21c (downflow) of the two pipes 21, the internal space 41c (horizontal flow) of the fourth pipe 41, the upper internal space 11cd (upflow) of the first pipe 11, and the internal space 31c (horizontal flow) of the third pipe 31 )... Can be formed without using a special flow device. In the circulating flow, the concentration of dissolved oxygen in the water 91 is almost the highest, and the extraction water provided at a position where the raw water from the raw water injection section 51 (the dissolved oxygen concentration is low) is not mixed. By extracting the water 91 from the outlet 24, water having a high dissolved oxygen concentration can be produced stably.
In addition, in the present apparatus 1, by controlling the flow rate of the raw water supply by the flow rate control valve 58 of the raw water injection unit 51, an amount of water 91 equal to the supply amount is supplied to the horizontal pipe of the gas dissolved water extraction unit 71. Since it overflows and is extracted from 77, it can operate stably, without requiring a separate means for controlling the amount of extraction.
That is, the present apparatus 1 is a device having a simple structure as described above, and manages the flow control valve 58 to the raw water injection unit 51 and the flow control valve 66 of the pressurized air, so that high dissolved oxygen can be obtained. In addition to being able to produce water with a concentration stably and inexpensively, by controlling the flow control valve 58 to the raw water injection unit 51 and the flow control valve 66 for pressurized air, water having an arbitrary dissolved oxygen concentration Can be created.

  As described above, the present apparatus 1 has a first flow path whose lower end along the vertical direction is closed (here, the upper internal space existing above the upper surface of the dispersion plate 61 in the internal space 11c of the first pipe 11). 11 cd) and a communication channel (here, a third channel) that communicates the first upper position P1a and the first lower position P1b, which are different positions in the vertical direction of the first channel (the upper internal space 11cd of the first pipe 11). An internal space 31c of the pipe 31, an internal space 21c of the second pipe 21, and an internal space 41c of the fourth pipe 41.) and a communication channel (the internal space 31c of the third pipe 31 and the second pipe 21). Liquid supply means (here, the raw water injection part 5) for supplying a liquid (here water) to a supply position (position where the tip 53a of the water injection pipe 53 exists) existing in the internal space 21c and the internal space 41c of the fourth pipe 41. ) And the communication channel (the internal space 31c of the third pipe 31, the internal space 21c of the second pipe 21, and the internal space 41c of the fourth pipe 41) from the extraction position (position of the extraction outlet 24) to liquid (water) And a blowing position (here, the position of the first flow path (the upper internal space 11cd of the first pipe 11) below the first upper position P1a). Gas (air) is formed in the liquid (water 91) in the first flow path (upper internal space 11cd of the first pipe 11) by blowing gas (here, air) into the upper surface of the dispersion plate 61). Due to the rising force of the bubbles 81, the first flow path (the upper internal space 11 cd of the first pipe 11) and the communication flow path (the internal space 31 c of the third pipe 31, the internal space 21 c of the second pipe 21, and the fourth pipe 41 Inside A circulation channel including the space 41c) (the upper internal space 11cd of the first pipe 11, the internal space 31c of the third pipe 31, the internal space 21c of the second pipe 21, and the internal space 41c of the fourth pipe 41) is liquid (water ) In which a circulating flow is formed (including a compressor 64, a flow rate control valve 66, a gas chamber 65, and a dispersion plate 61). After passing through the extraction position (position of the outlet 24) from (the position of the upper surface of the dispersion plate 61), it further passes through the supply position (position of the tip 53a of the water injection pipe 53) and the blowing position (on the upper surface of the dispersion plate 61). It is a device for dissolving gas (air) in liquid (water), which is to be returned to (position). In addition, the 1st flow path along an up-down direction is not only a flow path extended straight in the vertical up-down direction as shown in FIG. 1, but the fluid (liquid, gas) when flowing along a flow path. What is necessary is that the height of the fluid becomes a monotonic function (for example, monotonically increases) according to the displacement.

In the present apparatus 1, the blowing means (including the compressor 64, the flow control valve 66, the gas chamber 65, and the dispersion plate 61) is a first lower position of the first flow path (the upper internal space 11 cd of the first pipe 11). A partition plate (distribution plate 61) that partitions a lower space (gas chamber 65) and a first flow path (upper internal space 11cd of the first pipe 11) below P1b so that gas (air) can pass therethrough; And a pumping means (compressor 64, flow control valve 66) for pumping gas (air) into the space (gas chamber 65).
In the present apparatus 1, the discharge direction of the liquid (water) supplied by the liquid supply means (raw material water injection unit 51) at the supply position (position of the tip 53 a of the water injection pipe 53) is the supply position of the circulating flow (water injection pipe 53. The flow direction substantially coincides with the flow direction at the tip 53a.
In the present apparatus 1, the first upper position P1a is the closed upper end of the first flow path (the upper internal space 11cd of the first pipe 11).

The apparatus 1 includes an opening means (here, the opened upper end of the internal space 21c of the second pipe 21) for opening the upper surface of the liquid (water) that forms the circulation flow.
In the present apparatus 1, a communication channel (an internal space 31 c of the third pipe 31, an internal space 21 c of the second pipe 21, an internal space 41 c of the fourth pipe 41) is formed along the vertical direction, and the upper end is open. The lower end of the second flow path (inner space 21c of the second pipe 21) is closed, and is different in the vertical direction of the second flow path (inner space 21c of the second pipe 21) than the upper end. Of the second upper position P2a and the second lower position P2b existing below, the second upper position P2a communicates with the first upper position P1a and the second lower position P2b communicates with the first lower position P1b. The opened upper end of the path (inner space 21c of the second pipe 21) forms an opening means. In addition, the 2nd flow path along the up-down direction is not only a flow path extending straight in the vertical up-down direction as shown in FIG. 1, but also when fluid (liquid, gas) flows along the flow path. Any fluid may be used as long as the height of the fluid becomes a monotone function (for example, monotonous decrease) according to the displacement.

In the present apparatus 1, the extraction position (position of the extraction outlet 24) exists between the second upper position P2a and the second lower position P2b.
In the present apparatus 1, the communication flow path (the internal space 31c of the third pipe 31, the internal space 21c of the second pipe 21, and the internal space 41c of the fourth pipe 41) includes the second lower position P2b and the first lower position P1b. And a lower communication flow path (inner space 41c of the fourth pipe 41), and the supply position (position of the water injection pipe 53 tip 53a) is between the second lower position P2b and the first lower position P1b. It exists.
In this apparatus 1, the liquid extraction means (gas dissolved water extraction portion 71) is connected to the extraction position (the position of the extraction outlet 24) at the lower end, and the extraction flow path (of the internal space of the vertical pipe 75 is open). The liquid in the extraction flow path (the part of the internal space of the vertical pipe 75 located below the position where the horizontal pipe 77 is attached). (Water 91) overflows from the upper end of the extraction flow path (the portion existing below the position where the horizontal pipe 77 is attached in the internal space of the vertical pipe 75) (flows out toward the horizontal pipe 77). Liquid (water) is extracted.
In the present apparatus 1, the liquid supply means (raw material water injection section 51) is connected to the supply position (position of the water injection pipe 53 tip 53 a) at the lower end and the supply flow path (inside the raw water holding pipe 55 is open). Space), and by supplying liquid (water) to the supply flow path (internal space of the raw water holding pipe 55), the communication flow path (internal space 31c of the third pipe 31) due to gravity to the liquid (water). The liquid (water) is supplied to the supply position (position of the water injection pipe 53 tip 53a) of the internal space 21c of the second pipe 21 and the internal space 41c of the fourth pipe 41).

DESCRIPTION OF SYMBOLS 1 This apparatus 11 1st pipe 11c Internal space 11cd Upper internal space 21 2nd pipe 21c Internal space 24 Outlet 31 3rd pipe 31c Internal space 41 4th pipe 41c Internal space 51 Raw material water injection part 53 Injecting pipe 53a Tip 55 Raw material Water holding pipe 57 Pump 58 Flow control valve 61 Dispersion plate 64 Compressor 65 Gas chamber 66 Flow control valve 71 Gas dissolved water extraction part 73 Extraction pipe 75 Vertical pipe 77 Horizontal pipe 81 Air bubbles 91 Water 101 External

Claims (5)

A first flow path whose lower end along the vertical direction is closed;
A communication channel that communicates the first upper position and the first lower position, which are different positions in the vertical direction of the first channel;
Liquid supply means for supplying liquid to a supply position existing in the communication channel;
Liquid extraction means for extracting liquid from an extraction position existing in the communication channel;
When the gas is blown into the blowing position which is the position of the first flow path below the first upper position, the rising flow of bubbles formed in the liquid in the first flow path causes the first flow path and the communication flow. Blowing means for forming a circulating flow in which a liquid circulates in a circulation flow path including a path;
An opening means for opening the upper surface of the liquid forming the circulation flow;
With
After the circulating flow passes through the extraction position from the blowing position, it further passes through the supply position and returns to the blowing position again.
The communication channel is a second channel that is formed along the vertical direction, the upper end is open and the lower end is closed, and is a second position that is located below the upper end and is at a different position in the vertical direction of the second channel. Of the upper position and the second lower position, the second upper position communicates with the first upper position, the second lower position communicates with the first lower position, and the opened upper end of the second flow path forms an opening means. And a second communication channel that communicates the second lower position and the first lower position,
The supply position exists between the second lower position and the first lower position, and the discharge direction of the liquid supplied by the liquid supply means at the supply position substantially coincides with the flow direction at the supply position of the circulating flow,
An apparatus for dissolving a gas in a liquid, wherein an extraction position exists between a second upper position and a second lower position.     The blowing means includes a lower space existing below the first lower position of the first flow path and a partition plate that partitions the first flow path so that gas can pass therethrough, and a pressure feeding means that pumps the gas into the lower space. The gas dissolving apparatus for liquid according to claim 1, which is formed as described above.     The gas dissolving apparatus for liquid according to claim 1 or 2, wherein the first upper position is a closed upper end of the first flow path. The liquid extraction means comprises an extraction flow path whose lower end communicates with the extraction position and whose upper end is open,
The gas dissolving apparatus for liquid according to any one of claims 1 to 3, wherein the liquid in the extraction flow channel overflows from the upper end of the extraction flow channel to extract the liquid. The liquid supply means comprises a supply flow path whose lower end communicates with the supply position and whose upper end is opened;
The gas dissolving apparatus for liquid according to claim 1, wherein the liquid is supplied to the supply position of the communication flow path by gravity to the liquid by supplying the liquid to the supply flow path.

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