Degassing device

Abstract

To provide a deaerator where labor required for maintenance can be reduced.SOLUTION: A deaerator (1) is disposed above the liquid level (L3) of a liquid (L2) stored in a liquid tank (L1) and has a discharge port (10) to discharge a liquid containing a dissolved gas from the upper side of the liquid level and a collision plate (20) where the liquid discharged from the discharge port collides, is scattered and is fallen on the liquid level.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a degassing device. [Background technology]

[0002] Various techniques have been known for removing dissolved gases from a liquid. For example, Patent Documents 1 and 2 disclose a technique for removing carbon dioxide from water to be treated by spraying the water, in which carbon dioxide has been dissolved, from a nozzle. Furthermore, Patent Documents 3 and 4 disclose a technique for removing exhaust gases from fish and shellfish contained in water for rearing the fish and shellfish by blowing air or the like into the water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-120993 [Patent Document 2] Japanese Patent Application Publication No. 7-178387 [Patent Document 3] Japanese Patent Application Publication No. 5-3735 [Patent Document 4] Patent No. 6858996 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technique of spraying a liquid containing dissolved gas from a nozzle has the problem that the nozzle is easily clogged and requires a lot of maintenance work. Also, the technique of blowing air or the like into a liquid containing dissolved gas has the problem that dirt is easily accumulated in an air blowing section such as an aeration pipe and requires a lot of maintenance work. One aspect of the present invention aims to provide a degassing device that can reduce the maintenance work. [Means for solving the problem]

[0005] In order to solve the above problems, a degassing device according to one embodiment of the present invention comprises an outlet that is arranged above the liquid surface of a liquid stored in a liquid tank and that ejects the liquid containing dissolved gas from above the liquid surface, and an impact plate that is arranged between the outlet and the liquid surface and that collides the liquid ejected from the outlet to cause the liquid to splash and then fall onto the liquid surface. [Effects of the Invention]

[0006] According to one aspect of the present invention, a degassing device that can reduce the labor required for maintenance can be realized. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic front view showing a degassing device according to an embodiment of the present invention. [Figure 2] 2 is an exploded view showing an example of an installation mode of an impingement plate of the degassing device shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described in detail below. Fig. 1 is a schematic front view showing a degassing device 1 according to an embodiment of the present invention. In Fig. 1, the direction from top to bottom represents the vertical direction VD.

[0009] [Configuration of degassing device] 1, the degassing device 1 can be used to degas a liquid L2 stored in a liquid tank L1. The degassing device 1 includes a discharge port 10 and an impingement plate 20. The degassing device 1 may further include a pump 30, to which a pipe 40 may be connected. In the illustrated example, the discharge port 10 is formed as an outlet of the pipe 40 on the opposite side from the pump 30.

[0010] The liquid tank L1 may be an aquarium for raising living organisms, such as fish. In this case, the liquid L2 may be, for example, seawater or freshwater. When living organisms are raised in the liquid tank L1, the carbon dioxide concentration may increase in the liquid L2 stored in the liquid tank L1 due to the metabolism of the living organisms.

[0011] The degassing apparatus 1 according to this embodiment is used to degas, for example, carbon dioxide contained in the liquid L2. However, the present invention is not limited to this, and the degassing apparatus 1 may also be used to degas, for example, dissolved gases other than carbon dioxide from the liquid L2.

[0012] The outlet 10 is disposed above the liquid level L3 of the liquid L2 and discharges the liquid L2 containing dissolved gas from above the liquid level. In the illustrated example, the degassing apparatus 1 includes a plurality of outlets 10. The degassing apparatus 1 includes, for example, 28 outlets 10, but the number of outlets included in the degassing apparatus 1 may be 27 or less, or 29 or more. The greater the number of outlets 10, the higher the degassing efficiency of the degassing apparatus 1. However, the present invention is not limited to this, and the degassing apparatus 1 may include only one outlet 10.

[0013] The collision plate 20 is disposed between the discharge port 10 and the liquid level L3, and causes the liquid L2 discharged from the discharge port 10 to collide with the collision plate 20, causing the liquid L2 to splash and then fall to the liquid level L3. In the example of Fig. 1, the degassing device 1 includes two collision plates 20. However, the present invention is not limited to this, and the degassing device 1 may include one collision plate 20 or three or more collision plates 20.

[0014] According to the above configuration, the liquid L2 discharged from the discharge port 10 is caused to collide with the collision plate 20 and splash, thereby increasing the contact area between the liquid L2 and the air and enabling the dissolved gas to be degassed from the liquid L2. In this way, the degassing device 1 degasses the dissolved gas using the collision plate 20, and therefore does not suffer from nozzle clogging as occurs in conventional devices. Therefore, according to the above configuration, it is possible to realize a degassing device 1 that can reduce the labor required for maintenance.

[0015] 1, the distance d1 in the vertical direction VD between the discharge port 10 and the upper surface of the collision plate 20 may be equal to or greater than the distance d2 in the vertical direction VD between the lower surface of the collision plate 20 and the liquid level L3. In the above configuration, by relatively increasing the distance d1 between the discharge port 10 and the collision plate 20, the collision speed of the liquid L2 discharged from the discharge port 10 when it collides with the collision plate 20 increases, making it easier for the liquid L2 to scatter. Therefore, the above configuration can improve the efficiency of degassing dissolved gases.

[0016] The ratio (C1 / C2) of the carbon dioxide concentration (C1) in the liquid L2 when it reaches the liquid surface L3 after colliding with the collision plate 20 and scattering, to the carbon dioxide concentration (C2) in the liquid L2 when it is discharged from the discharge port 10 may be within a predetermined range. For example, the ratio C1 / C2 may be 80% or less, preferably 70% or less, and more preferably 60% or less. According to the above configuration, the efficiency of degassing dissolved gas from the liquid L2 can be increased.

[0017] The collision plate 20 may be installed in a substantially horizontal direction, that is, parallel to the liquid surface L3. In such a configuration, the liquid L2 is more likely to scatter after colliding with the collision plate 20, which increases the contact area between the liquid L2 and the air and improves the efficiency of degassing dissolved gases.

[0018] Alternatively, the collision plate 20 may be installed so as to be inclined with respect to the liquid level L3. In such a configuration, solid impurities that accumulate on the collision plate 20 tend to fall to the liquid level L3, thereby reducing the amount of solid impurities that accumulate on the collision plate 20.

[0019] FIG. 2 is an exploded view showing an example of an installation mode of the collision plate 20. As shown in FIG. 2, the collision plate 20 may be a perforated plate having a plurality of through-holes 21 formed therein. With the above configuration, even if the liquid L2 contains solid impurities, at least some of the solid impurities can pass through the through-holes 21, thereby reducing the amount of solid impurities that accumulate on the collision plate 20. This reduces the frequency of cleaning the collision plate 20. Examples of solid impurities include animal droppings and leftover food.

[0020] The ratio of the total opening area of ​​the plurality of through holes 21 to the area of ​​the collision plate 20 (hereinafter abbreviated as "opening area ratio") may be, for example, 0.20% or more, preferably 0.40% or more, and more preferably 0.60% or more. The higher the opening area ratio, the more the amount of solid impurities that accumulate on the collision plate 20 can be reduced.

[0021] The opening area ratio may be, for example, 5.0% or less, preferably 3.0% or less, and more preferably 1.0% or less. The lower the opening area ratio, the higher the degassing efficiency of dissolved gases can be.

[0022] The diameter of the through-holes 21 may be, for example, 2.0 mm or more, preferably 4.0 mm or more, and more preferably 6.0 mm or more. The larger the diameter of the through-holes 21, the more the amount of solid impurities that accumulate on the collision plate can be reduced.

[0023] The diameter of the through-holes 21 may be, for example, 12 mm or less, preferably 10 mm or less, and more preferably 8.0 mm or less. The smaller the diameter of the through-holes 21, the more efficient the degassing of dissolved gases can be.

[0024] The collision plate 20 may be transparent or translucent, which allows visual confirmation of the state of contamination on the upper and lower surfaces of the collision plate 20. The material of the collision plate 20 may be, for example, transparent vinyl chloride or polycarbonate.

[0025] The collision plate 20 may be attached to a stand 26 via a mesh 24. The collision plate 20 may be fixed to the mesh 24 by, for example, a cable tie (not shown). When the collision plate 20 is a perforated plate, the mesh size of the mesh 24 is preferably larger than the through-holes 21 formed in the collision plate 20. According to the above configuration, the flow of the liquid L2 that has passed through the through-holes 21 is less likely to stagnate, so that a decrease in the circulation efficiency of the liquid L2 due to the installation of the mesh 24 can be suppressed. Note that the installation mode of the collision plate 20 according to the present invention is not limited to the example shown in FIG. 2, and the collision plate 20 may be installed in other installation modes.

[0026] The collision plate 20 is not limited to a flat plate or a perforated plate having through holes 21. Since the purpose of the collision plate 20 is to repel and scatter the liquid L2 dropped from above, it may be any plate that can repel the liquid L2. The collision plate 20 may be, for example, an uneven plate, a corrugated plate, or a curved plate. Alternatively, the collision plate 20 may be, for example, a plurality of round or square bars arranged and connected in a plate shape.

[0027] As shown in Fig. 1, the pump 30 is a device that sends the liquid L2 stored in the liquid tank L1 to the discharge port 10. A known pump can be used as the pump 30. In the example of Fig. 1, the degassing device 1 includes one pump 30, but the present invention is not limited to this, and the degassing device 1 may include two or more pumps 30.

[0028] The discharge rate of the pump 30 can be changed as appropriate depending on the capacity of the liquid tank L1, etc. Furthermore, when living organisms are raised in the liquid tank L1, the discharge rate of the pump 30 may be changed depending on the number and weight of the living organisms raised in the liquid tank L1.

[0029] For example, if the capacity of the liquid tank L1 is 100m 3 More than 500m 3 If the total discharge amount of the liquid L2 discharged from the plurality of discharge ports 10 per unit time is 100 m 3 / hour or more 500m 3 / hour or less. According to the above configuration, the liquid L2 in the liquid tank L1 is circulated while the dissolved gas is efficiently degassed by the collision plate 20. The discharge amount per pump 30 may be changed appropriately depending on the number of pumps 30 so as to satisfy the above total discharge amount.

[0030] Furthermore, when carbon dioxide is degassed from the liquid L2, the amount of carbon dioxide degassed per unit time may be 50 kg / hour or more and 250 kg / hour or less. With the above configuration, the degassing apparatus 1 can be suitably applied to, for example, fish farming. However, the present invention is not limited to this, and the degassing apparatus 1 may be applied to applications other than fish farming.

[0031] The pipe 40 is connected to the pump 30. A known pipe can be used as the pipe 40. The outlet 10 may be formed, for example, as the outlet of an elbow pipe located at the end of the pipe 40 opposite the pump 30, so as to face downward in the vertical direction VD. In this case, a valve (not shown) may be provided on the pump 30 side of the elbow pipe. With the above configuration, the number of outlets 10 that discharge the liquid L2 can be easily changed. Therefore, even if the total discharge amount of the liquid discharged from the multiple outlets 10 is small, the liquid pressure of the liquid L2 discharged from each outlet 10 can be increased, and the degassing efficiency of dissolved gas can be improved.

[0032] [Operation of the degassing device] The following describes the operation when degassing dissolved gas contained in a liquid using the degassing device 1. First, when the pump 30 starts operating, the pump 30 sucks in the liquid L2 stored in the liquid tank L1 and sends it into the pipe 40. The liquid L2 sent into the pipe 40 by the pump 30 moves through the pipe 40 and is discharged from the discharge port 10.

[0033] The liquid L2 discharged from the discharge port 10 collides with the collision plate 20, scatters, and then falls to the liquid level L3. At this time, the scattered liquid L2 comes into contact with air, causing at least a portion of the dissolved gas contained in the liquid L2 to be degassed. The liquid L2 that has fallen to the liquid level L3 is collected in the liquid tank L1 and is again sucked into the pump 30. In this way, the liquid L2 in the liquid tank L1 repeats the cycle of passing through the pump 30, the piping 40, and the discharge port 10, colliding with the collision plate 20, and falling to the liquid level L3. This allows the concentration of dissolved gas to be reduced while circulating the liquid L2 in the liquid tank L1.

[0034] As described above, in the degassing device 1, the dissolved gas is degassed using the collision plate 20, and therefore, nozzle clogging and the like that occurs in the conventional art do not occur. Therefore, according to this embodiment, it is possible to realize a degassing device 1 that can reduce the labor required for maintenance.

[0035] The degassing device 1 can also be suitably applied to, for example, fish farming, where excrement and leftover food from living organisms may be generated in the liquid L2. Such an effect contributes to the achievement of Goal 14 of the Sustainable Development Goals (SDGs) advocated by the United Nations, "Conserve and sustainably use the water below sea level," by preventing overfishing, for example.

[0036] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in the embodiments are also included in the technical scope of the present invention.

[0037] [Example] An embodiment of the present invention will be described below. Note that the degassing device 1 described in this embodiment is merely an example and does not limit the degassing device according to one aspect of the present invention.

[0038] Example 1 First, the liquid tank L1 has a diameter of 15 m, a height of 2 m, and a capacity of 300 m. 3 A tank was prepared and filled with seawater as liquid L2.

[0039] Next, four transparent vinyl chloride plates, each 600 mm wide, 1200 mm long, and 3 mm thick, were prepared as collision plates 20, and 144 through holes 21, each 7.0 mm in diameter, were formed in each plate so that they were evenly spaced. Specifically, eight rows of through holes 21 were formed in the width direction and 18 rows in the length direction in each transparent vinyl chloride plate, with the center-to-center distance between adjacent through holes 21 being 60 mm. The opening area ratio was calculated to be 0.77%.

[0040] As pump 30, 300m 3 A circulation pump capable of operating at a discharge rate of 1 / hour was prepared.

[0041] As piping 40, a vinyl chloride pipe with an inner diameter of 125 mm to 150 mm was connected to pump 30 as shown in Figure 1, and an elbow pipe with an inner diameter of 40 mm was connected to the opposite side of the vinyl chloride pipe from pump 30. Discharge port 10 was configured as the outlet of the elbow pipe, facing downward in the vertical direction VD.

[0042] The collision plate 20 was installed so that the distance d1 in the vertical direction VD between the discharge port 10 and the collision plate 20 was 1.1 m, and the distance d2 in the vertical direction VD between the collision plate 20 and the liquid surface L3 was 0.6 m. As shown in FIG. 2, the collision plate 20 was attached to a stand 26 via a mesh 24.

[0043] Then, mackerel were raised in the liquid tank L1 while operating the pump 30. The liquid tank L1 was provided with separate pipes connected to equipment for performing each of the following processes: (i) solid matter removal, (ii) nitrification (ammonia removal), and (iii) oxygen dissolution, and the above processes (i) to (iii) were carried out outside the liquid tank L1.

[0044] Immediately after starting operation of the pump 30, the carbon dioxide concentration (C1) in the liquid L2 when it reaches the liquid surface L3 after colliding with the collision plate 20 and scattering, and the carbon dioxide concentration (C2) in the liquid L2 when it is discharged from the discharge port 10 were measured. As a result of the measurement, the ratio of C1 / C2 was 53.1%, indicating good degassing efficiency.

[0045] Furthermore, when measured three days after starting circulation by pump 30, the C1 / C2 ratio was 42.2%, indicating that the degassing device 1 of Example 1 maintained good degassing efficiency for a long period of time.

[0046] <Comparative Example 1> Degassing was carried out in the same manner as in Example 1, except that instead of the collision plate 20 in Example 1, a gas-liquid contact filler (manufactured by Kansai Kako Co., Ltd., product name: Biofrontier Net) was placed in a net, which was then placed in a basket and placed under each of the multiple discharge ports 10.

[0047] Immediately after starting circulation by the pump 30, the carbon dioxide concentration (C1) in the liquid L2 when it reaches the liquid level L3 after colliding with the gas-liquid contact packing and scattering was measured, as well as the carbon dioxide concentration (C2) in the liquid L2 when it is discharged from the discharge port 10. As a result of the measurement, the ratio of C1 / C2 was 46.0%, indicating good degassing efficiency.

[0048] However, three days after starting circulation by the pump 30, part of the gas-liquid contact packing material became clogged with mackerel droppings and leftover food. Therefore, in Comparative Example 2, it was confirmed that frequent maintenance of the gas-liquid contact packing material was necessary to prevent a decrease in degassing efficiency.

[0049] 〔summary〕 [1] a discharge port disposed above the liquid surface of the liquid stored in the liquid tank, for discharging the liquid containing dissolved gas from above the liquid surface; a collision plate disposed between the discharge port and the liquid surface, which causes the liquid discharged from the discharge port to collide with the collision plate, causing the liquid to scatter and then drop onto the liquid surface; A degassing device comprising:

[0050] [2] The degassing device according to [1], wherein the collision plate is a perforated plate having a plurality of through holes formed therein.

[0051] [3] The degassing device according to [1] or [2], wherein the vertical distance between the discharge port and the collision plate is equal to or greater than the vertical distance between the collision plate and the liquid surface.

[0052] [4] It has a plurality of outlets, The capacity of the liquid tank is 100m 3 More than 500m 3 or less, the total discharge amount of the liquid discharged from the plurality of discharge ports per unit time is 100 m 3 / hour or more 500m 3 / hour or less according to any one of [1] to [3].

[0053] [5] the dissolved gas is carbon dioxide, The degassing apparatus according to any one of [1] to [4], wherein the amount of carbon dioxide degassed from the liquid per unit time is 50 kg / hour or more and 250 kg / hour or less. [Explanation of symbols]

[0054] 1 Degassing device 10 outlet 20 Collision plate 24 mesh 26 Mounting stand 30 Pump 40 Piping d1 Vertical distance between the outlet and the collision plate d2 Vertical distance between the collision plate and the liquid surface L1 liquid tank L2 liquid L3 liquid level

Claims

1. A liquid tank for raising fishes, the liquid containing dissolved gas and excrement or residual food of the fishes being discharged from above the liquid surface by a discharge port disposed above the liquid surface of the liquid stored in the tank; a collision plate disposed between the discharge port and the liquid surface, which causes the liquid discharged from the discharge port to collide with the collision plate, causing the liquid to scatter and then drop onto the liquid surface; Equipped with the collision plate is a perforated plate having a plurality of through holes formed therein; A degassing device, wherein the ratio of the total opening area of ​​the plurality of through holes to the area of ​​the collision plate is 0.20% or more and 5.0% or less, and the diameter of the plurality of through holes is 2.0 mm or more and 12.0 mm or less.

2. The collision plate is attached to a base via a mesh, The degassing device according to claim 1 , wherein the mesh openings are larger than the plurality of through holes.

3. 3. The degassing device according to claim 1, wherein the vertical distance between the discharge port and the collision plate is equal to or greater than the vertical distance between the collision plate and the liquid surface.

4. It has a plurality of outlets, The capacity of the liquid tank is 100 m ３ Over 500m ３ or less, the total discharge amount of the liquid discharged from the plurality of discharge ports per unit time is 100 m ３ / hour or more 500m ３ 3. The degassing apparatus according to claim 1, wherein the degassing time is 1 hour or less.

5. the dissolved gas is carbon dioxide, 5. The degassing apparatus according to claim 4, wherein the amount of carbon dioxide degassed from the liquid per unit time is 50 kg / hour or more and 250 kg / hour or less.

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