Gas dissolution and diffusion devices

Abstract

We provide a gas dissolution and diffusion device. [Solution] The gas dissolution and diffusion device includes an outer housing and an inner housing, with at least one outlet port axially positioned on the side wall of the outer housing. The inner housing is partially housed in a mixing chamber. Furthermore, a portion of the inner housing has a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture. After the gas-liquid mixture is introduced from the gas-liquid inlet and flows out from the inner housing outlet, a gas-liquid flow is generated that circulates within the mixing chamber. The inner housing outlet and the outer housing outlet port are located on opposite sides. The gas dissolution and diffusion device can uniformly fill aquaculture farms with high-density bubbles and increase the amount of dissolved oxygen in the water. The gas dissolution and diffusion device does not require the use of additional pumps or circulation devices and reduces energy consumption.

Description

Technical Field

[0001] This application relates to the field of aquaculture, and more particularly, includes gas dissolution and diffusion devices. More specifically, this application includes a device for supplying oxygen to water using an oxygen-rich gas.

Background Art

[0002] In various applications, it is necessary or desirable to dissolve a gas or gaseous fluid in a liquid. A typical example is dissolving oxygen in water. Oxygen supply devices in the aquaculture industry play an important role in ensuring sufficient oxygen supply in water. To obtain a high-yield aquaculture result, the dissolved oxygen content is one of the important indicators for the survival of aquatic organisms.

[0003] Known techniques, such as dissolvers like aeration cones, are typically installed separately in a bypass of the main flow path. Both the gas and the liquid are pressurized and then introduced from the high-pressure pipeline downstream of the oxygen cone into the main pipeline.

[0004] One of the main problems to be solved is to ensure uniform distribution of oxygen throughout the aquaculture farm. This requires careful placement of the oxygen diffuser devices and continuous monitoring of the oxygen levels at different locations. If a particular area does not receive sufficient oxygen, it can lead to death of organisms and poor growth and development. Different aquatic organisms have different oxygen requirements. Conventional aquatic organisms require a dissolved oxygen content of 5 - 8 mg / L. Some special species of fish require a dissolved oxygen content of 10 - 12 mg / L or even more.

[0005] Another issue that needs to be addressed is to minimize energy consumption. In the prior art, it is described that this can be achieved through optimal placement of energy-efficient pumps.

[0006] Existing solutions for oxygen supply equipment in the aquaculture industry include various types of dissolvers, pumps, and aeration systems. Some widely used diffusers can generate microbubbles, increasing the surface area available for oxygen transport. Coarser bubbles can also be generated, which further promotes the mixing and circulation of the liquid. In addition, some systems use membrane diffusers. While the above solutions can deliver oxygen to aquatic organisms, these solutions can be inadequate and very expensive. A common drawback is the need for high energy input, especially in the operation of large-scale water systems. Furthermore, the effectiveness of the system is limited if environmental factors, such as irregular water flow or temperature changes, limit the system's ability to maintain consistent oxygen levels. Another common drawback is the large footprint, as they often exist independently outside the aquaculture farm. In some offshore aquaculture vessels or pond farming methods, the structures are not small enough to save space. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] U.S. Patent Application Publication No. 3804255A [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] To address these challenges, it is necessary to improve the efficiency of oxygen dissolution. This may involve developing gas dissolution and diffusion devices with higher dissolved oxygen efficiency and energy efficiency. [Means for solving the problem]

[0009] This patent addresses the challenge of uniform oxygen distribution throughout an aquaculture farm. The gas dissolution and diffusion device can utilize the energy of an existing system without requiring additional devices. In an aquaculture farm, a local pressure difference exists between an oxygen-rich gas-water mixture and dissolved oxygen, forming a driving gradient, thereby causing the gas-water mixture to rapidly diffuse throughout the farm and subsequently enter the bodies of aquatic organisms.

[0010] A first aspect of this application provides a gas dissolution and diffusion device. A more preferred environment is for supplying oxygen to water in aquaculture. Those skilled in the art will understand that the gas dissolution and diffusion device may also be used for the dissolution and diffusion of nitrogen, carbon dioxide, hydrogen, and other gases in water.

[0011] The entire gas dissolution and diffusion device is partially immersed in the water of the aquaculture farm.

[0012] A first aspect of this application is a gas dissolution and diffusion device, An outer housing comprising a first end, a side wall, and a second end defining a mixing chamber, wherein at least one outflow port is axially positioned on the side wall of the outer housing, An inner housing, partially housed in a mixing chamber, having one end of the inner housing as a gas-liquid inlet for introducing a gas-liquid mixture, and the other end forming an inner housing outlet, the gas-liquid inlet located upstream of the first end of the outer housing, and a portion of the inner housing having a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture, Includes, A gas-liquid mixture is introduced from the gas-liquid inlet and flows out from the inner housing outlet, after which a gas-liquid flow is generated that circulates within the mixing chamber. The inner housing outlet and outer housing outflow port, located on opposite sides, provide a gas dissolution and diffusion device.

[0013] Furthermore, a portion of the inner housing forms an open variable diameter section.

[0014] Furthermore, the other end of the inner housing has a conical portion, and the conical portion communicates with the mixing chamber.

[0015] Furthermore, the conical portion has a sufficiently large opening that extends from a wide radial cross-section to a narrow radial cross-section.

[0016] Furthermore, the conical portion of the inner housing and the remaining non-conical portion cooperate to form an inlet passage for the gas-liquid mixture.

[0017] Furthermore, the outer housing outflow ports are arranged at a specified interval.

[0018] Furthermore, the conical portion of the inner housing forms an inclined surface that is inclined with respect to the axial direction, and the angle between the inclined surface and the axis is 20° to 25°.

[0019] Furthermore, the inclined surface terminates at the surface of the outflow port that is closer in the downstream direction.

[0020] Furthermore, at least a part of the inner housing has a semi-conical shape (half cone).

[0021] Furthermore, the inner housing is oriented vertically.

[0022] Furthermore, the outflow ports of the outer housing are a pore structure or a nozzle.

[0023] Furthermore, the diameter of the outer housing outflow port that is closer in the upstream direction is smaller than the diameter of the outer housing outflow port that is closer in the downstream direction.

[0024] Furthermore, the ratio of the cross-sectional area of the first end of the outer housing to the cross-sectional area of the gas-liquid inlet of the inner housing is 2 to 3:1.

[0025] Compared with the prior art, the technical solution provided by this application has the following advantages. 1. The gas dissolution and diffusion device of this application can uniformly fill aquaculture farms with high-density bubbles and increase the amount of dissolved oxygen in the water. 2. The gas dissolution and diffusion device of this application does not require the use of additional pumps or circulation devices, thereby reducing energy consumption. 3. The gas dissolution and diffusion device of this application has a suitable volume and can be directly placed in the water area of ​​an aquaculture farm. It does not require additional external space and has a compact structure.

[0026] The advantages and purpose of this application can be further understood through the detailed description and figures below. [Brief explanation of the drawing]

[0027] [Figure 1] Figure 1 is a schematic diagram of the gas dissolution and diffusion device used in Example 1 of this application. [Figure 2] Figure 2 is a schematic diagram of the gas dissolution and diffusion device used in Example 2 of this application. [Modes for carrying out the invention]

[0028] In the diagram, 101 indicates the gas-liquid inlet, 102 indicates the first end, 103 indicates the second end, 104 indicates the outer housing sidewall, 105 indicates the outer housing outlet port, 106 indicates the mixing chamber, 107 indicates the inner housing outlet, 1081 indicates the non-conical portion of the inner housing, and 1082 indicates the conical portion of the inner housing.

[0029] Specific embodiments of this application will be described in detail below, with reference to the accompanying drawings. However, this application should be understood as not being limited to the embodiments described below, and the technical concepts of this application may be implemented in combination with other well-known technologies or other technologies having the same function as these well-known technologies.

[0030] Explanation of terms In the description of the specific embodiments below, many descriptive terms are used to clearly illustrate the structure and mode of operation. However, terms such as “forward,” “backward,” “left,” “right,” “outward,” “inward,” “outward,” “inward,” “axial,” and “radial” should be understood as terms of convenience and not as limiting terms.

[0031] In the description of the specific embodiments below, terms indicating orientation or positional relationships, such as “length,” “width,” “top,” “bottom,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “upper,” “bottom,” “inside,” and “outside,” should be understood to be merely for the convenience of a brief description and not to indicate or suggest that the devices or elements referred to have a particular orientation or need to be configured and operated in a particular orientation, based on the orientation or positional relationships shown in the accompanying figures, and therefore should not be understood as limitations to this application. In addition, when it is stated that the first structure is positioned “above” or “below” the second structure, this should be understood to mean that the first structure is positioned far from or near the horizontal plane.

[0032] Furthermore, the terms “first” and “second” are used solely for descriptive purposes and do not imply any limitation to time, quantity, or importance, nor should they be understood to indicate or suggest relative importance or imply the quantity of the technical features shown, but simply to distinguish one technical feature from another in the present technical solution. Accordingly, a feature defined as “first” or “second” may explicitly or implicitly include one or more of these features. In the description of this application, “multiple” means two or more unless otherwise specified strictly and in detail. Similarly, modifiers such as “about” and “approximately” appearing before numbers in this specification usually include the number itself, and their specific meaning should be understood in conjunction with the context.

[0033] In this application, “at least one (item)” should be understood as meaning one or more, and “multiple” as meaning two or more. “And / or” is used to describe the relationship between related objects, indicating that three relationships exist. For example, “A and / or B” may indicate the existence of A only, the existence of B only, and the simultaneous existence of both A and B, where A and B can be singular or plural. The letter “ / ” generally indicates that the preceding and following related objects are in a “logical OR” relationship. “At least one of the following” or similar expressions means any combination of these items, including a single item or any combination of multiple items. For example, “at least one of a, b or c” may represent a, b, c, “a and b,” “a and c,” “b and c,” or “a, and b, and c,” where a, b, and c can be singular or plural.

[0034] However, the methods disclosed in this disclosure or other illustrated and / or illustrative methods may be illustrated and / or illustrated in this disclosure as a series of actions or events. It should be understood that the order in which these actions or events are shown should not be construed as limiting. For example, some actions may be performed in a different order and / or simultaneously than the actions or events illustrated and / or illustrated in this disclosure. In addition, not all illustrative actions may be necessary to carry out one or more aspects or embodiments of this disclosure, and one or more actions of this disclosure may be performed in one or more separate actions and / or stages.

[0035] In this application, unless otherwise expressly designated and specified, terms such as “installed,” “connected,” “linked,” and “fixed” should be understood in a broad sense. For example, this could be a fixed connection, a removable connection or integrally formed connection, a mechanical connection or an electrical connection, a direct connection or an indirect connection via an intermediate medium, or an internal communication or interaction relationship between two elements. Those skilled in the art will understand the specific meaning of the above terms in this application according to the specific context. “Fixed and connected,” or “fixed connection,” or “immovably connected” means that the connection between two or more structural members is not configured to allow relative movement. Examples of fixed connections are welded joints or bolted connections, and in some cases welded seams and bolted connections. “Movably connected,” or “movable,” or “movable connection” means a connection between two or more structural members that allows horizontal and / or vertical relative movement between them under extreme dynamic loads. Such connections typically do not allow movement under static loads or general dynamic loads (such as those applied by a light breeze).

[0036] The terms “unit,” “piece,” “item,” and “module” as used herein refer to a unit that performs at least one function and operation, and may be implemented by hardware components, software components, or combinations thereof.

[0037] As used herein, “upstream” and “downstream” are defined with respect to the intended flow of a fluid (e.g., water flow). The upstream end corresponds to the end closest to the point where the fluid is introduced into the inlet, and the downstream end corresponds to the outlet or nozzle end from which the fluid exits.

[0038] The term “axial” means a direction substantially parallel to the axis of rotation, axis of symmetry, or centerline of one or more components. For example, in a cylinder having a centerline and opposite circular ends, the “axial” direction may mean the direction extending parallel to the centerline between the opposite ends. In certain cases, the term “axial” may be used with respect to components that are not cylindrical (or otherwise radially symmetric). Furthermore, as used herein, the term “radial” may mean the direction or relationship of a component to a line extending perpendicularly outward from a shared centerline, axis, or similar reference. In this specification, the centerline (axis) direction of the inner housing or the outer housing may be taken as axial. In this specification, it is not required that the inner housing and the outer housing remain coaxial.

[0039] The terms "high pressure" and "medium pressure" mean that high pressure is higher than medium pressure; therefore, the difference between high pressure and medium pressure can be relatively small.

[0040] The terms "high temperature" and "low temperature" mean that high temperature is higher than low temperature; therefore, the difference between high and low temperatures may be relatively small.

[0041] As used herein, the term “aquaculture” means the cultivation or farming of aquatic animals and / or plants in natural or controlled marine or freshwater environments, primarily for human consumption or use, and may mean aquatic animals such as fish, shellfish, crustaceans and other aquatic (marine or freshwater) organisms.

[0042] As used herein, the terms “pipe” and “shell” include references to rigid or flexible materials or combinations thereof for providing a passage for fluid flow. A hose or rigid pipe may mean an elongated tubular body formed of any material that may include rigid plastic or metal.

[0043] As used herein, the terms “water body” and “water” mean seawater (e.g., the ocean) and inland freshwater or saltwater (e.g., lakes, reservoirs, rivers).

[0044] Water is a preferred liquid used or described in accordance with this application, but other types of liquids may be used in the apparatus of this application. Furthermore, oxygen is a preferred gas to be introduced into a liquid or preferably water. However, other gases may be introduced or dissolved into a liquid using the apparatus of this application. In relation to this application, it should be noted that the term “gas” is not limited to pure gases and may also include gaseous mixtures of different gases.

[0045] As used herein, dissolved oxygen (DO) refers to the amount of oxygen dissolved in water, expressed in milligrams (mg / L) of oxygen per liter of water. Oxygen dissolved in water is called dissolved oxygen, and it exists in water in a molecular state. The amount of dissolved oxygen in water increases with increasing water temperature or pressure. Under conditions of 1 atmosphere and 25°C, water can dissolve approximately 8.26 mg / L of oxygen. This is called the saturated dissolved oxygen amount. In the aquaculture industry, this value is often referred to as the 100% saturated oxygen concentration (100% saturated oxygen concentration). The oxygen pressure of the oxygen supply originates from the oxygen source and is typically between 2 and 5 bar. Accordingly, increasing the water pressure can result in dissolved oxygen concentrations reaching 100% saturated oxygen, 200% saturated oxygen, 300% saturated oxygen, 500% saturated oxygen, 700%, or even 800% saturated oxygen concentrations. An oxygen-rich gas is understood as an oxygen-containing gas that contains at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 95%, or at least 99% oxygen. Pure oxygen means an oxygen-rich gas that contains at least 90% oxygen.

[0046] A "vertical housing" refers to a tubular housing that extends vertically and is parallel to the direction of gravity during use.

[0047] "Circulating flow (fluid)," "circulating flow," and "circulating flow" refer to a flow that moves along or around an axis. Circulating flow means that a gas-liquid mixture is released from near an inclined surface and then agitated in a circulating manner in the flow direction. In addition, the velocity of the resulting circulating flow can be controlled to some extent, from low to high, depending on the supply rate and pressure of the liquid and gas.

[0048] Conversely, unless explicitly indicated otherwise, each aspect or embodiment defined herein may be combined with any other aspect or embodiment. In particular, any feature that is preferably or advantageously shown may be combined with any other feature that is preferably or advantageously shown.

[0049] Specific embodiments of this application will be described in detail with reference to the accompanying drawings. Embodiments may span multiple drawings. In embodiments, the same reference numerals generally indicate the same or corresponding elements. Therefore, descriptions of embodiments are interwoven, and descriptions of subjects common to embodiments are generally not repeated here.

[0050] The gas dissolution and diffusion device provided by this application is An outer housing comprising a first end 102, a side wall 104, and a second end 103, which constitute a mixing chamber 106, wherein at least one outflow port 105 is axially positioned on the side wall 104 of the outer housing, An inner housing, partially housed in a mixing chamber 106, with one end of the inner housing being a gas-liquid inlet 101 for introducing a gas-liquid mixture, and the other end forming an inner housing outlet 107, the gas-liquid inlet 101 being located upstream of the first end 102 of the outer housing, and a portion of the inner housing having a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture, Includes, A gas-liquid mixture is introduced from the gas-liquid inlet 101 and flows out from the inner housing outlet 107, after which a gas-liquid flow is generated that circulates within the mixing chamber 106. The inner housing outlet 107 and the outer housing outflow port 105 are located on opposite sides.

[0051] Here, "opposite side" means that the outer housing outlet port 105 is located in the direction in which the inner housing outlet 107 extends radially. The direction in which the inner housing outlet 107 opens is opposite to the direction of the outer housing outlet port 105.

[0052] A portion of the inner housing forms an open, variable-diameter section.

[0053] The first end 102 of the outer housing is set on a predetermined horizontal plane. This predetermined horizontal plane may be the water surface of an aquaculture farm.

[0054] The outlet port 105 of the outer housing may be designed to a fixed size according to a specific design and may pass through a structure formed by a hole or nozzle. The outlet port 105 may have a nozzle incorporated into it for high-speed and highly soluble gas-liquid mixtures.

[0055] Furthermore, a portion of the inner housing has a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture. This portion of the gradually decreasing cross-section is a smooth passage through which the gas-liquid mixture can flow, and the shape of this radially projecting portion may be, for example, trapezoidal or triangular.

[0056] Furthermore, one end of the inner housing outlet 107 has a conical portion 1082, which communicates with the mixing chamber 106. The conical portion 1082 may have a sufficiently large opening that extends from a wide radial cross-section to a narrow cross-section.

[0057] Furthermore, the conical portion 1082 and the non-conical portion 1081 of the inner housing cooperate to form an inlet passage for the gas-liquid mixture.

[0058] Furthermore, the radial cross-sectional area of ​​the cone portion 1082 gradually decreases toward the downstream direction, and has a continuously shrinking diameter.

[0059] Furthermore, the surface of the conical portion 1082 closer to the upstream side is coplanar with the surface of the non-conical portion 1081 closer to the downstream side.

[0060] Furthermore, the cone portion 1082 may extend from a first diameter equal to or similar to the diameter of the gas-liquid inlet 101 to a second diameter smaller than the first diameter.

[0061] Furthermore, the outer housing outlet ports 105 are arranged at specified intervals.

[0062] Furthermore, the conical portion 1082 of the inner housing forms an inclined surface that is tilted with respect to the axial direction, and the angle between the inclined surface and the axis is 20° to 25°. Overall, the gas-liquid mixture generates a circulating flow in the axial or radial direction within the mixing chamber 106. This circulating flow does not consume more energy. The inclined surface guides the gas-liquid flow, forming a typical vortex or counter-rotating flow, ensuring sufficient gas-water circulation. This type of mixing allows the operator to adjust the water flow to the optimal level for the organism. The gas-water mixture flows near the inner housing outlet 107, guiding the water and either rising or flowing axially upstream. As the gas-liquid mixture flow approaches the closed first end 102 of the outer housing, the gas-liquid mixture flow rotates. Interactions between multiple flows cause rotations of 90° to 180°, flowing toward the outer housing sidewall 104 and the second end 103.

[0063] The inclined surface of the inner housing prevents the gas-liquid mixture from blowing directly out of the outlet port 105, and increases the residence time of the gas in the water. The inclined surface terminates at a specific outlet port 105. A better solution is for the inclined surface to terminate at an intermediate outlet port 105 that is closer downstream. This ensures that the highly soluble oxygen in the inner housing mixes as uniformly as possible with the less soluble oxygen in the outer housing before blowing out through the outlet port 105. The flow pattern of these circulating flows can be elliptical. The size of the elliptical flow pattern and the fluid velocity are controlled by the amount of fluid introduced.

[0064] Furthermore, at least a portion of the inner housing has a semi-conical shape (a cone-shaped half).

[0065] Furthermore, the inner housing is oriented vertically.

[0066] Furthermore, the ratio of the cross-sectional area of ​​the first end 102 of the outer housing to the cross-sectional area of ​​the gas-liquid inlet 101 of the inner housing is 2 to 3:1.

[0067] The gas-liquid mixture flows out from the inner housing outlet 107 and enters the mixing chamber 106 at a specific angle to the radial direction, initially generating a circulating water flow that flows upstream. As the dissolved oxygen concentration increases, some scattering, inversion, and diffusion are formed in the mixing chamber 106 due to the stirring effect of the gas-liquid mixture blown out from the inner housing outlet 107. The injection force of the gas-liquid mixture itself forms vortices or turbulence, and the gas and water come into contact with each other and stir, promoting the dissolution of oxygen in the water, causing the highly soluble gas-liquid mixture to be blown out from the outlet port 105, resulting in aquaculture water with high dissolved oxygen.

[0068] A gas dissolution and diffusion device is used to increase the dissolved oxygen concentration, and finally, water containing dissolved oxygen is injected into the aquaculture farm. The device creates beneficial agitation.

[0069] The circulating gas-liquid mixture is discharged from the outlet port 105 of the outer housing. The outlet port 105 may be of a fixed size according to a specific design, or it may pass through a structure or porous surface having holes, where these holes are located at points where the gas and liquid concentrate. Introducing gas into liquid through small openings or porous surfaces is also called diffusion.

[0070] The gas-liquid inlet 101 introduces pressurized liquid and gas from the outside. The liquid only needs to be subjected to a small amount of pressure. Taking oxygen as an example, this application does not limit the oxygen injection method, which may be, for example, a nozzle, a Venturi tube, or a static mixer.

[0071] Materials for the inner and outer housings may include metals such as SUS304 and SUS316, plastics (high-density polyethylene, PVC, fiber-reinforced plastics), resins, wood, glass, and ceramics. Appropriate materials can be selected for each component. The inner housing may be formed integrally or formed by welding or bonding various parts. Preferably, the above-described apparatus using the apparatus described in the embodiments mentioned is expandable or contractible to accommodate commercially available standard or custom housings.

[0072] According to this application, gas can be introduced into a liquid in the form of tiny bubbles. These tiny bubbles can reach the micro-nano level, for example, less than 100 microns. One advantage of such small bubbles is their relatively long contact time with water, resulting in a uniform distribution of small bubbles in the water. Due to the pressure difference between the oxygen-rich bubbles and the oxygen in the water, the oxygen within the bubbles diffuses more rapidly into the water and subsequently enters living organisms. The larger the pressure difference, the faster and more effective the diffusion of oxygen becomes.

[0073] A portion of the inner housing is immersed in water. The ideal positions of the inner and outer housings are such that the gas-water mixture diffuses when it reaches the inclined surface. The area of ​​agitation formed by the gas-water mixture changes depending on the depth to which the inner housing is placed within the outer housing.

[0074] As the gas-liquid mixture flows from the inner housing outlet 107 into the mixing chamber 106, in addition to the circulating flow, vortices flowing along the periphery of the gas-liquid circulating flow can also be generated. As a result, the average wrap distance of the circulating flow can be increased, and the turbulent changes generated by the circulating flow increase, which promotes the dissolution of oxygen in the water and makes the oxygen ejected from the outlet port 105 finer. [Examples]

[0075] Example 1 As shown in Figure 1, let's take a vertically arranged oxygen dissolution and diffusion device as an example.

[0076] The volume of the aquaculture area is 300 m³. 3 The depth is 5m. A pump unit is used to draw the necessary water source; for example, a water supply pump ensures the water velocity introduced into the inner housing. A gas dissolution and diffusion device is connected to a gas supply device that generates or supplies oxygen and delivers oxygen.

[0077] The outer housing has a diameter of 150 mm, and the inner housing has a diameter of 100 mm. The distance from the first end 102 to the second end 103 of the outer housing is 1200 mm. The spacing between each outer housing outlet port 105 is 100 mm. To generate higher back pressure downstream of the outer housing, the hole diameter of each outlet port may vary. Exemplarily, in this embodiment, a total of 10 outlet ports are provided in the outer housing side wall 104. Of these, the equivalent diameters of the 1st to 5th outlet ports from the upstream are 10 mm, and the equivalent diameters of the 6th to 10th outlet ports are 14 mm. The angle formed between the inclined surface formed by the cone portion 1082 of the inner housing and the axis is 20°.

[0078] The water flow range is 50m 3 / h~80m 3 The flow rate is 1.5 kg / h. The water pressure range of the oxygen and water mixture introduced through the gas-liquid inlet 101 is 0.6 bar to 1.6 bar. The injection rate of pure oxygen forming the gas-liquid mixture is 1.5 kg / h. The water flow velocity at the outer housing outlet port 105 is 12 m / s to 15 m / s. Dissolved oxygen measuring instruments uniformly distributed throughout the aquaculture farm measured that the oxygen solubility in the water could reach a saturated oxygen concentration of 500%, and the oxygen dissolution efficiency was close to 100%.

[0079] Example 2 As shown in Figure 2, let's take a horizontally arranged oxygen dissolution and diffusion device as an example.

[0080] The volume of the aquaculture area is 300 m³. 3The depth is 5m. A pump unit is used to draw the necessary water source; for example, a water supply pump ensures the water velocity introduced into the inner housing. The water flow rate range is 50m 3 / h~80m 3 The flow rate is 1.5 kg / h. The water pressure range of the oxygen and water mixture introduced through the gas-liquid inlet 101 is 0.6 bar to 1.6 bar. The injection rate of pure oxygen forming the gas-liquid mixture is 1.5 kg / h. The water flow velocity at the outer housing outlet port 105 is 12 m / s to 15 m / s. Dissolved oxygen measuring instruments uniformly distributed throughout the aquaculture farm measured that the oxygen solubility in the water could reach a saturated oxygen concentration of 500%, and the oxygen dissolution efficiency was close to 100%.

[0081] Due to the horizontally positioned oxygen dissolution and diffusion devices, oxygen tends to accumulate at the top. The outflow ports 105 provided on the outer housing sidewall 104 can be distributed at specific intervals of 10 cm with the same equivalent diameter.

[0082] Comparative Example C1 An oxygen cone is a common auxiliary oxygen supply device. For example, in the conical oxygen supply device disclosed in (Patent Document 1), a water flow is injected from top to bottom into an inverted cone contact chamber by a water pump. An oxygen inlet pipe is located at the top of the inverted cone contact chamber, where the oxygen mixes with the high-speed water flow, forming numerous bubbles that flow downward with the water. In the downward flow of the oxygen and water mixture, the cross-sectional area gradually expands and the water flow velocity continuously decreases.

[0083] The inventors conducted tests using the conventional oxygen cone described above, according to the conditions shown in Table 1 below.

[0084] [Table 1]

[0085] An oxygen cone requires that the water flow rate and oxygen flow rate be kept in equilibrium; otherwise, oxygen bubbles will accumulate at the top of the contact chamber, or the effluent will not reach a saturated oxygen concentration. However, in actual operation, the water flow and oxygen fluctuate over time, making it difficult for them to reach equilibrium. If the oxygen flow rate exceeds the saturated dissolved oxygen level, the rising bubbles gradually accumulate at the top of the conical contact chamber, forming pores, reducing the contact strength and duration between the water and the bubbles, further compressing the water level in the contact chamber, and squeezing the bubbles out of the reactor. Furthermore, the residence time of the water flow in the oxygen cone is limited, resulting in insufficient disturbance between the gas and liquid, and failing to promote mass transfer between the gas and liquid.

[0086] From the results in Table 1 above, it can be seen that the oxygen cone requires more energy supplied by the water pump, and the oxygen transfer efficiency does not reach the expected level. However, the device of this application does not require additional energy consumption, and the circulating water device significantly reduces energy consumption.

[0087] The contents described herein are merely preferred specific embodiments of this application, and the embodiments described above are not intended to limit this application but are used solely to illustrate the technical solutions of this application. Any technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experimentation based on the concepts of this application are included within the scope of this application. [Explanation of Symbols]

[0088] 101 Gas-Liquid Inlet 102 First end 103 Second end 104 Side wall 105 Outflow Port 106 Mixing room 107 Inner housing exit 1081 Non-conical section 1082 Cone section

Claims

1. A gas dissolution and diffusion device, An outer housing comprising a first end (102), a side wall (104), and a second end (103) defining a mixing chamber (106), wherein at least one outflow port (105) is axially positioned on the side wall (104) of the outer housing, An inner housing, which is partially housed in the mixing chamber (106), wherein one end of the inner housing is a gas-liquid inlet (101) for introducing a gas-liquid mixture, and the other end forms an inner housing outlet (107), the gas-liquid inlet (101) is located upstream of the first end (102) of the outer housing, and a portion of the inner housing has a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture. Includes, The gas-liquid mixture is introduced from the gas-liquid inlet (101) and flows out from the inner housing outlet (107), after which a gas-liquid flow is generated that circulates within the mixing chamber (106). The inner housing outlet (107) and the outer housing outlet port (105) are located on opposite sides of a gas dissolution and diffusion device.

2. The gas dissolution and diffusion device according to claim 1, wherein a portion of the inner housing constitutes an open variable diameter portion.

3. The gas dissolution and diffusion device according to claim 1 or 2, wherein the other end of the inner housing has a conical portion (1082), and the conical portion (1082) communicates with the mixing chamber (106).

4. The gas dissolution and diffusion device according to claim 3, wherein the conical portion (1082) extends from a wide radial cross-section to a narrow radial cross-section.

5. The gas dissolution and diffusion device according to claim 3, wherein the conical portion (1082) and the remaining non-conical portion (1081) of the inner housing cooperate to form an inlet passage for the gas-liquid mixture.

6. The gas dissolution and diffusion device according to claim 3, wherein the conical portion (1082) of the inner housing forms an inclined surface that is inclined with respect to the axial direction, and the angle between the inclined surface and the axis is 20° to 25°.

7. The gas dissolution and diffusion device according to claim 6, wherein the inclined surface terminates on the surface of the outflow port that is located closer in the downstream direction.

8. The gas dissolution and diffusion device according to claim 1, wherein the inner housing is oriented vertically.

9. The gas dissolution and diffusion device according to claim 1, wherein the outflow port of the outer housing is a hole structure or a nozzle.

10. The gas dissolution and diffusion device according to claim 1, wherein the diameter of the outer housing outlet port located closer in the upstream direction is smaller than the diameter of the outer housing outlet port located closer in the downstream direction.

11. The gas dissolution and diffusion device according to claim 1, wherein the ratio of the cross-sectional area of ​​the first end of the outer housing to the cross-sectional area of ​​the gas-liquid inlet of the inner housing is 2 to 3:1.

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