Gas dissolving and diffusing device

Abstract

This application discloses a gas dissolution diffusion device, comprising an outer shell and an inner shell. At least one outlet is axially arranged on the side wall of the outer shell. The inner shell is partially housed within a mixing chamber. A portion of the inner shell has a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture. The gas-liquid mixture is introduced through a gas-liquid inlet and flows out through the outlet of the inner shell, generating a gas-liquid flow circulating within the mixing chamber. The outlet of the inner shell and the outlet of the outer shell are located on opposite sides. This gas dissolution diffusion device can uniformly and densely fill the aquaculture area with bubbles, increasing the dissolved oxygen content in the water. It eliminates the need for additional pumps or circulation devices, reducing energy consumption.

Description

Technical Field

[0001] This application relates to the field of aquaculture, specifically to a gas dissolution and diffusion device. More specifically, it relates to a device for oxygenating water using oxygen-enriched gas. Background Technology

[0002] In many applications, it is necessary or appropriate to dissolve gases or gaseous fluids into liquids. A typical example is dissolving oxygen in water. Aeration devices in aquaculture play a crucial role in ensuring a sufficient supply of oxygen in the water. Dissolved oxygen levels are one of the key indicators for the survival of aquatic organisms in order to achieve high-yield aquaculture results.

[0003] Known technologies, such as aeration cones, typically use a separate bypass on the main pipeline. Both the gas and liquid are pressurized and introduced into the main pipeline from a high-pressure pipe downstream of the aeration cone.

[0004] One of the main challenges is ensuring even oxygen distribution throughout the aquaculture area. This requires careful placement of oxygen diffusers and continuous monitoring of oxygen levels at different locations. Insufficient oxygen in certain areas can lead to organism mortality and poor growth. Different aquatic organisms have different oxygen requirements. Typical aquatic organisms require 5 to 8 mg / L of dissolved oxygen. Some specific fish species require 10 to 12 mg / L or even higher.

[0005] Another challenge that must be addressed is minimizing energy consumption. Existing technologies document this by using an energy-efficient pump with optimal placement.

[0006] Existing solutions for aeration equipment in aquaculture include various types of dissolvers, pumps, and aeration systems. Some widely used diffusers produce microbubbles, increasing the surface area available for oxygen transport. They can also produce coarse bubbles, which facilitate liquid mixing and circulation. Additionally, some systems use membrane diffusers. While these solutions may be able to deliver oxygen to aquatic organisms, they can be inefficient and very costly. A common drawback is the high energy input required, especially in large-scale aquaculture systems. Furthermore, the system's effectiveness is limited if environmental factors such as irregular water flow or temperature variations restrict its ability to maintain consistent oxygen levels. Another common disadvantage is the large footprint, often requiring the system to be located outside the aquaculture area. This makes them less compact and space-efficient for some offshore aquaculture ships or pond aquaculture methods.

[0007] To address these challenges, improvements in oxygen dissolution efficiency are needed. This may include developing gas dissolution diffusion devices with higher dissolved oxygen efficiency and energy efficiency. Summary of the Invention

[0008] This patent solves the problem of uniform oxygen distribution throughout the aquaculture area. The gas dissolution diffusion device can utilize the energy of existing systems without the need for additional equipment. A local pressure difference exists between the oxygen-rich gas-water mixture and the dissolved oxygen in the aquaculture area, creating a driving gradient that allows the gas-water mixture to rapidly diffuse into the aquaculture area and subsequently into the aquatic organisms.

[0009] The first aspect of this application provides a gas dissolution and diffusion device. A more preferred environment is for oxygenation of aquaculture water. Those skilled in the art will understand that this gas dissolution and diffusion device can also be used for the dissolution and diffusion of nitrogen, carbon dioxide, hydrogen, etc., in water.

[0010] The entire gas dissolution and diffusion device is partially submerged in the water of the aquaculture area.

[0011] The first aspect of this application provides a gas dissolution and diffusion apparatus, comprising:

[0012] The outer casing, including a first end, a side wall, and a second end, forms a mixing chamber. At least one outlet is arranged axially on the side wall of the outer casing.

[0013] An inner shell is partially housed within a mixing chamber. One end of the inner shell serves as a gas-liquid inlet for introducing a gas-liquid mixture, while the other end forms an inner shell outlet. The gas-liquid inlet is located upstream of the first end of the outer shell. Furthermore, a portion of the inner shell has a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture.

[0014] The gas-liquid mixture is introduced from the gas-liquid inlet and flows out from the inner shell outlet, generating a gas-liquid flow that circulates in the mixing chamber.

[0015] The inner shell outlet and the outer shell outlet are located on opposite sides.

[0016] Furthermore, a portion of the inner shell forms an open variable-diameter section.

[0017] Furthermore, the other end of the inner shell has a tapered portion that communicates with the mixing chamber.

[0018] Furthermore, the tapered portion has a sufficiently large opening, extending from a wide radial section to a narrow radial section.

[0019] Furthermore, the conical portion of the inner shell and the remaining non-conical portion cooperate to form an entry channel for the gas-liquid mixture.

[0020] Furthermore, the outlets of the outer casing are arranged at predetermined intervals.

[0021] Furthermore, the tapered portion of the inner shell forms an inclined surface that is tilted relative to the axial direction, the inclined surface forming an angle of 20° to 25° with respect to the axis.

[0022] Furthermore, the inclined surface terminates at the plane where the outlet is located, which is closer to the downstream direction.

[0023] Furthermore, at least a portion of the inner shell is semi-conical in shape (conical half).

[0024] Furthermore, the inner shell is vertically oriented.

[0025] Furthermore, the outlet of the outer casing is a perforated structure or a nozzle.

[0026] Furthermore, the diameter of the outer shell outlet closer to the upstream direction is smaller than the diameter of the outer shell outlet closer to the downstream direction.

[0027] Furthermore, the ratio of the cross-sectional area of ​​the first end of the outer shell to the cross-sectional area of ​​the gas-liquid inlet of the inner shell is 2 to 3:1.

[0028] Compared with the prior art, the technical solution provided in this application has the following advantages:

[0029] 1. The gas dissolution and diffusion device of this application can uniformly fill the aquaculture area with high density of bubbles, thereby increasing the dissolved oxygen content in the water.

[0030] 2. The gas dissolution diffusion device of this application does not require the use of additional pumps or circulation devices, thus reducing energy consumption.

[0031] 3. The gas dissolution and diffusion device of this application has a moderate size and can be placed directly in the water body of the aquaculture area. It does not require additional external space and has a compact structure. Attached Figure Description

[0032] The advantages and spirit of this application can be further understood through the following detailed description and accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the gas dissolution and diffusion device used in Embodiment 1 of this application.

[0034] Figure 2 This is a schematic diagram of the gas dissolution and diffusion device used in Embodiment 2 of this application.

[0035] In the diagram: 101 represents the gas-liquid inlet, 102 represents the first end, 103 represents the second end, 104 represents the outer shell sidewall, 105 represents the outer shell outlet, 106 represents the mixing chamber, 107 represents the inner shell outlet, 1081 represents the non-conical part of the inner shell, and 1082 represents the conical part of the inner shell. Detailed Implementation

[0036] The specific embodiments of this application are 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 concept of this application can be implemented in combination with other known technologies or other technologies with the same function as those known technologies.

[0037] Terminology Explanation

[0038] In the following description of specific embodiments, in order to clearly illustrate the structure and working method, a number of directional terms will be used for description. However, terms such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "axial", and "radial" should be understood as convenient terms and not as limiting terms.

[0039] In the following description of specific embodiments, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Furthermore, when the first structure is described as being positioned "above" or "below" the second structure, this should be understood to mean that the first structure is positioned further away from or closer to the horizontal plane.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not refer to a limitation on chronological order, quantity, or importance. They should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated, but are merely used to distinguish one technical feature from another in this technical solution. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. Similarly, modifiers such as "approximately" or "approximately" preceding numerals generally include the number itself, and their specific meaning should be understood in conjunction with the context.

[0041] It should be understood that in this application, "at least one (item)" means one or more, and "more than one" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can 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 single or multiple.

[0042] However, the methods disclosed herein, or other methods shown and / or described herein, may be shown and / or described 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 interpreted in a limiting sense. For example, some actions may be performed in a different order and / or simultaneously with the actions or events shown and / or described herein. Furthermore, not all shown actions are required to implement one or more aspects or embodiments of this disclosure, and one or more actions of this disclosure may be performed as one or more separate actions and / or stages.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium; or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. "Fixed connection," "fixed connection," or "non-moving connection" is understood to refer to a connection between two or more structural members that is not constructed to provide relative movement. An embodiment of a fixed connection is a welded connection or a bolted connection, and in some cases, a weld and bolted connection. "Moving connection," "active," or "sliding connection" is understood to refer to a connection between two or more structural members that allows horizontal and / or vertical relative movement between the members under extreme dynamic loads. Such connections typically do not allow movement under static loads or general dynamic loads (e.g., those imposed by light / moderate wind forces).

[0044] The terms “unit,” “item,” “object,” and “module” described in this specification refer to a unit for performing at least one function and operation, and can be implemented by hardware components or software components and combinations thereof.

[0045] In this specification, "upstream" and "downstream" are defined relative to the expected flow of fluid (e.g., water flow). The upstream end corresponds to the end closest to where fluid is introduced into the inlet, and the downstream end corresponds to the outlet or nozzle end from which fluid exits.

[0046] The term "axial" refers to a direction generally parallel to the axis of rotation, axis of symmetry, or centerline of a component or components. For example, in a cylinder with a centerline and opposite circular ends, the "axial" direction can refer to the direction extending parallel to the centerline between the opposite ends. In some cases, the term "axial" may be used relative to components that are not cylindrical (or otherwise radially symmetrical). Furthermore, the term "radial," as used herein, can refer to the direction or relationship of a component relative to a line extending perpendicularly outward from a shared centerline, axis, or similar reference. In this document, the direction of the centerline (axis) of the inner or outer housing may be defined as axial. Furthermore, it is not necessary for the inner and outer housings to remain coaxial in this document.

[0047] The terms "high pressure" and "medium pressure" mean that high pressure is higher than medium pressure, so the difference between the two may be relatively small.

[0048] The terms "high temperature" and "low temperature" mean that high temperature is higher than low temperature, so the difference between the two may be relatively small.

[0049] As used herein, the term “aquaculture” means the cultivation or raising of aquatic animals and / or plants in a natural or controlled marine or freshwater environment primarily for human consumption or use, and may also refer to aquatic animals such as fish, shellfish, crustaceans, and other aquatic (marine or freshwater) organisms.

[0050] As used herein, the terms “tube” and “shell” include references to rigid or flexible materials or combinations thereof to provide a passage for fluid flow. Hose and rigid tube can refer to an elongated tubular body made of any material, including rigid plastics or metals.

[0051] As used in this article, the term "body of water" refers to seawater (e.g., ocean) as well as inland freshwater or saltwater, such as lakes, reservoirs, and rivers.

[0052] Although water is the preferred liquid used or described in this application, other types of liquids may also be used with the apparatus of this application. Furthermore, oxygen is a preferred gas to be introduced into the liquid or preferably into water. However, other gases may be introduced into or dissolved in the liquid using the apparatus of this application. It should be noted that, in the context of this application, the term "gas" is not limited to pure gases, but may also include gaseous mixtures of different gases.

[0053] As used in this article, dissolved oxygen (DO) refers to the amount of oxygen dissolved in water (mg / L), expressed as milligrams of oxygen per liter of water. Oxygen dissolved in water exists in a molecular state. The dissolved oxygen content in water increases as water temperature decreases or pressure increases. At 1 atmosphere and 25°C, water can dissolve approximately 8.26 mg / L of oxygen. This is called saturated dissolved oxygen. In the aquaculture industry, this value is often referred to as 100% saturated oxygen concentration. The oxygen pressure for oxygenation comes from the oxygen source and is typically 2 to 5 bar. By correspondingly increasing the water pressure, the dissolved oxygen concentration can reach 100%, 200%, 300%, 500%, 700%, or even 800% saturated oxygen concentration. Oxygen-enriched gas is understood to contain at least 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, or 99% oxygen. Pure oxygen refers to oxygen-enriched gas containing at least 90% oxygen.

[0054] "Vertical shell" refers to a tubular shell that extends vertically and is parallel to the direction of gravity when in use.

[0055] "Circulating flow" or "circulating flow" refers to a flow that moves along or around an axis. Circulating flow means that after a gas-liquid mixture is ejected near an inclined surface, it circulates and agitates in the direction of flow. Furthermore, the speed of the resulting circulating flow can be controlled to some extent, from low to high, depending on the supply and pressure of the liquid and gas.

[0056] Unless otherwise clearly indicated, each aspect or embodiment defined herein may be combined with any other aspect or embodiment. In particular, any feature indicated as preferred or advantageous may be combined with any other feature indicated as preferred or advantageous.

[0057] Specific embodiments of this application are described in detail below with reference to the accompanying drawings. Embodiments are present throughout multiple views of the drawings. The same reference numerals in the embodiments generally denote the same or corresponding elements. Therefore, the description of the embodiments is incorporated herein by reference, and descriptions of common subject matter across embodiments are generally not repeated herein.

[0058] The gas dissolution and diffusion apparatus provided in this application includes:

[0059] The outer casing, including a first end 102, a side wall 104, and a second end 103, forms a mixing chamber 106. At least one outlet 105 is arranged axially on the side wall 104 of the outer casing.

[0060] An inner shell is partially housed within a mixing chamber 106. One end of the inner shell serves as a gas-liquid inlet 101 for introducing a gas-liquid mixture, while the other end forms an inner shell outlet 107. The gas-liquid inlet 101 is located upstream of the first end 102 of the outer shell. Furthermore, a portion of the inner shell has a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture.

[0061] The gas-liquid mixture is introduced from the gas-liquid inlet 101 and flows out from the inner shell outlet 107, generating a gas-liquid flow that circulates within the mixing chamber 106.

[0062] The inner shell outlet 107 and the outer shell outlet 105 are located on opposite sides.

[0063] The "opposite sides" here refers to the outer casing outlet 105 being located in the direction in which the inner casing outlet 107 extends radially. The inner casing outlet 107 opens in the opposite direction to the outer casing outlet 105.

[0064] A portion of the inner shell forms an open variable-diameter section.

[0065] The first end 102 of the outer shell is positioned above a predetermined horizontal plane. This predetermined horizontal plane can be the water surface of the aquaculture area.

[0066] The outlet 105 of the housing can be fixed in size by a specific design, or it can be a structure or nozzle with holes. The outlet 105 can be a nozzle integrated into the outlet 105 for high-velocity and high-solubility gas-liquid mixtures.

[0067] Furthermore, a portion of the inner shell has a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture. This gradually decreasing cross-section is a smooth channel for the flow of the gas-liquid mixture; for example, the radial projection shape of this portion can be trapezoidal or triangular.

[0068] Furthermore, one end of the inner housing outlet 107 has a tapered portion 1082, which communicates with the mixing chamber 106. This tapered portion 1082 may have a sufficiently large opening, extending from a wide radial cross-section to a narrow cross-section.

[0069] Furthermore, the conical portion 1082 and the non-conical portion 1081 of the inner shell cooperate to form an inlet channel for the gas-liquid mixture.

[0070] Furthermore, the radial cross-sectional area of ​​the tapered portion 1082 gradually decreases in the downstream direction, having a continuously shrinking diameter.

[0071] Furthermore, the upstream surface of the tapered portion 1082 is flush with the downstream surface of the non-tapered portion 1081.

[0072] Furthermore, the tapered 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.

[0073] Furthermore, the outer casing outlets 105 are arranged at predetermined intervals.

[0074] Furthermore, the conical portion 1082 of the inner shell forms an inclined surface tilted relative to the axial direction, the inclined surface forming an angle of 20° to 25° with respect to the axis. Overall, the gas-liquid mixture generates axial or radial circulating flow within the mixing chamber 106. This flow does not consume additional energy. The inclined surface guides the gas-liquid flow to form typical vortex or counter-rotating flow, ensuring sufficient gas-water circulation. This type of mixing allows the operator to adjust the water flow to be most suitable for the organism. The gas-water mixture flows near the outlet 107 of the inner shell and guides the water to rise or flow axially upstream. When the gas-liquid mixture flows approach the closed first end 102 of the outer shell, they change direction. The interaction between the multiple flows results in a 90° to 180° turn and flow towards the sidewall 104 and the second end 103 of the outer shell.

[0075] The inclined surface of the inner shell prevents the gas-liquid mixture from being directly ejected from the outlet 105, thus prolonging the residence time of the gas in the water. The inclined surface terminates at the plane where one of the outlets 105 is located. A better design is for the inclined surface to terminate at an outlet 105 further downstream. This ensures that the highly soluble oxygen in the inner shell mixes as evenly as possible with the less soluble oxygen in the outer shell before being ejected through the outlet 105. The flow pattern of these circulating flows can be elliptical. The size of the elliptical flow pattern and the velocity of the fluid are controlled by the amount of fluid introduced.

[0076] Furthermore, at least a portion of the inner shell is semi-conical in shape (conical half).

[0077] Furthermore, the inner shell is vertically oriented.

[0078] Furthermore, the ratio of the cross-sectional area of ​​the first end 102 of the outer shell to the cross-sectional area of ​​the gas-liquid inlet 101 of the inner shell is 2 to 3:1.

[0079] The gas-liquid mixture flows out of the inner shell outlet 107 and enters the mixing chamber 106 at a certain angle relative to the radial direction, initially generating a circulating water flow in the upstream direction. As the dissolved oxygen concentration increases, the agitation effect of the gas-liquid mixture ejected from the inner shell outlet 107 causes it to scatter, tumble, and disperse within the mixing chamber 106. The jetting force of the gas-liquid mixture itself creates vortices or turbulence, causing the gas and water to come into contact and agitate each other, promoting oxygen dissolution in the water and driving the highly soluble gas-liquid mixture to be ejected from the outlet 105, resulting in a culture water body with high dissolved oxygen.

[0080] This gas-liquid dissolution diffusion device is used to increase the dissolved oxygen concentration and ultimately inject oxygenated water into the aquaculture area. Favorable agitation is created within the device.

[0081] A circulating gas-liquid mixture is ejected from the outlet 105 of the outer casing. The outlet 105 can be of a fixed size by a specific design, or it can be a structure with holes or a porous surface at the point where the gas and liquid will meet. Introducing gas into the liquid through small openings or porous surfaces is also known as diffusion.

[0082] 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 method of oxygen injection, and it can be, for example, a nozzle, a venturi tube, or a static mixer.

[0083] The materials for the inner and outer shells can include metals such as SUS304 and SUS316, plastics (high-density polyethylene, PVC, fiber-reinforced plastics), resins, wood, glass, and ceramics. Appropriate materials can also be selected for each component. The inner shell can be integrally molded or assembled from welded or glued parts. Preferably, the equipment described in the aforementioned embodiments can be scaled up to accommodate standardized or customized shells in the market.

[0084] According to this application, this allows for the introduction of gas into a liquid in the form of microbubbles. These microbubbles can be micro- or nano-sized, for example, below 100 micrometers. One advantage of these small bubbles is their relatively long contact time with water, resulting in a uniform distribution of the bubbles within the water. Due to the pressure difference between the oxygen-rich bubbles and the oxygen in the water, the oxygen in the bubbles diffuses more rapidly from the bubbles into the water and subsequently into organisms. The greater the pressure difference, the faster and more efficient the oxygen diffusion.

[0085] A portion of the inner shell is submerged in water. The ideal position of the inner and outer shells is such that the air-water mixture diffuses upon reaching the inclined surface. The area of ​​agitation created by the air-water mixture varies depending on the depth to which the inner shell is submerged in the outer shell.

[0086] Because the gas-liquid mixture flows into the mixing chamber 106 from the inner shell outlet 107, in addition to the circulating flow, eddies are generated along the circumference of the gas-liquid circulating flow. As a result, because the average distance of one revolution of the circulating flow is increased, the opportunities for turbulence generated by the circulating flow are increased, accelerating the dissolution of oxygen in the water, and making the oxygen ejected from the outlet 105 more refined.

[0087] Example 1

[0088] like Figure 1 The example shown is a vertically placed oxygen dissolution and diffusion device.

[0089] The volume of the aquaculture water area is 300m³. 3 The depth is 5m. A pumping unit is used to extract the required water source; for example, a water pump ensures the water velocity introduced into the inner shell. A gas dissolution and diffusion device is connected to an oxygen supply unit to generate or supply oxygen, thus enabling oxygen delivery.

[0090] The outer shell has a diameter of 150 mm, and the inner shell has a diameter of 100 mm. The distance from the first end 102 to the second end 103 of the outer shell is 1200 mm. The spacing between the outlets 105 of each outer shell is 100 mm. To create a higher back pressure in the downstream portion of the outer shell, the orifice diameters of each outlet may be different. For example, in this embodiment, the outer shell sidewall 104 has a total of 10 outlets. The equivalent diameter of the first to fifth outlets from the upstream is 10 mm, and the equivalent diameter of the sixth to tenth outlets is 14 mm. The angle between the inclined surface formed by the tapered portion 1082 of the inner shell and the axis is 20°.

[0091] The water flow rate ranges from 50m. 3 / h to 80m 3 / 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 pure oxygen injection rate to form the gas-liquid mixture is 1.5 kg / h. The water flow velocity at the outer shell outlet 105 is 12 m / s to 15 m / s. Dissolved oxygen measuring instruments evenly distributed in the aquaculture area show that the oxygen solubility in the water can reach 500% saturated oxygen concentration, and the oxygen dissolution efficiency is close to 100%.

[0092] Example 2

[0093] like Figure 2 The example shown is a horizontally placed oxygen dissolution and diffusion device.

[0094] The volume of the aquaculture water area is 300m³. 3 The depth is 5m. A pumping unit is used to extract the required water source; for example, a water pump ensures the water velocity introduced into the inner shell. The water flow rate ranges from 50m³ / h. 3 / h to 80m 3 / 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 pure oxygen injection rate for forming the gas-liquid mixture is 1.5 kg / h. The water flow velocity at the outer shell outlet 105 is 12 m / s to 15 m / s. Dissolved oxygen measuring instruments evenly distributed throughout the aquaculture area show that the oxygen solubility in the water can reach 500% saturated oxygen concentration, and the oxygen dissolution efficiency is close to 100%.

[0095] Because the oxygen dissolution and diffusion device is placed horizontally, oxygen tends to accumulate at the top. The outlets 105 provided on the side wall 104 of the outer casing can be distributed at specified intervals of 10 cm with the same equivalent diameter.

[0096] Comparative Example C1

[0097] An oxygen cone is a common auxiliary aeration device. For example, the cone-shaped aeration device disclosed in patent publication number US3804255A uses a water pump to inject water from top to bottom into an inverted conical contact chamber. An oxygen inlet pipe is located at the top of the inverted conical contact chamber. Oxygen mixes with the high-speed water flow, forming a large number of bubbles that flow downwards with the water. As the oxygen-water mixture flows downwards, its cross-sectional area gradually expands, and the water flow velocity continuously decreases.

[0098] The inventors conducted tests using the aforementioned conventional oxygen cone under the conditions shown in Table 1 below.

[0099] Table 1

[0100]

[0101] The oxygen cone reactor requires a balance between water and oxygen flow rates; otherwise, oxygen bubbles will accumulate at the top of the contact chamber or the effluent will not reach saturated oxygen concentration. However, in actual operation, water and oxygen flow rates fluctuate over time, making it difficult to achieve equilibrium. When the oxygen flow rate exceeds the saturated dissolved oxygen level, rising bubbles will gradually accumulate at the top of the conical contact chamber, forming gas cavities. This reduces the intensity and duration of contact between the water and bubbles, and may even compress the water level within the contact chamber, forcing the bubbles out of the reactor. Furthermore, the limited residence time of water within the oxygen cone results in insufficient turbulence between the gas and liquid, hindering mass transfer.

[0102] The results in Table 1 above show that the oxygen cone requires more energy from the water pump, and the oxygen transfer efficiency does not reach the expected level. In contrast, the equipment in this application does not require additional energy consumption or a circulating water system, significantly reducing energy consumption.

[0103] The embodiments described in this specification are merely preferred embodiments of this application. These embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of this application. Any technical solutions that can be obtained by those skilled in the art based on the concept of this application through logical analysis, reasoning, or limited experimentation should be within the scope of this application.

Claims

1. A gas dissolving and diffusing apparatus characterized by, The gas dissolution and diffusion device includes: The outer casing, including a first end (102), a side wall (104), and a second end (103), forms a mixing chamber (106). At least one outlet (105) is arranged axially on the side wall (104) of the outer casing. The inner shell is partially housed within the mixing chamber (106). One end of the inner shell is a gas-liquid inlet (101) for introducing a gas-liquid mixture, and the other end forms an inner shell outlet (107). The gas-liquid inlet (101) is located upstream of the first end (102) of the outer shell. Furthermore, a portion of the inner shell has a cross-sectional area that gradually decreases along the flow direction of the gas-liquid mixture. The gas-liquid mixture is introduced from the gas-liquid inlet (101) and flows out from the inner shell outlet (107), generating a gas-liquid flow that circulates in the mixing chamber (106). The inner shell outlet (107) and the outer shell outlet (105) are located on opposite sides.

2. The gas dissolving and diffusing apparatus according to claim 1, characterized by A portion of the inner shell forms an open variable-diameter section.

3. The gas-dissolving diffuser device according to claim 1 or 2, characterized in that The other end of the inner shell has a tapered portion (1082) that communicates with the mixing chamber (106).

4. The gas dissolving and diffusing apparatus according to claim 3, characterized by The tapered portion (1082) has a radial cross section that extends from a wide radial cross section to a narrow radial cross section.

5. The gas dissolving and diffusing apparatus according to claim 3, wherein The conical portion (1082) and the remaining non-conical portion (1081) of the inner shell cooperate to form an inlet channel for the gas-liquid mixture.

6. The gas dissolving and diffusing apparatus according to claim 3, characterized by The tapered portion (1082) of the inner shell forms an inclined surface that is tilted relative to the axial direction, the inclined surface forming an angle of 20° to 25° with respect to the axis.

7. The gas dissolving and diffusing apparatus according to claim 6, wherein The inclined surface terminates at the plane where the outlet is located, which is closer to the downstream direction.

8. The gas dissolving and diffusing apparatus according to claim 1, wherein The inner shell is vertically oriented.

9. The gas dissolving and diffusing apparatus according to claim 1, wherein The outlet of the outer casing is a perforated structure or a nozzle.

10. The gas dissolving and diffusing apparatus according to claim 1, wherein The diameter of the outer casing outlet closer to the upstream direction is smaller than the diameter of the outer casing outlet closer to the downstream direction.

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