An extended-range dissolved oxygen device

Abstract

The present invention discloses an extended-range dissolved oxygen device, comprising a water storage container, an aerator is provided at the bottom of the water storage container, and also comprising a bubble divider, the bubble divider is arranged above the aerator, the bubble divider comprises a bracket, a branching component is provided on the bracket, an arc-shaped guide plate is provided at one end of the bracket, the guide plate is connected to the branching component, the guide plate faces the aerator, and the end of the branching component away from the guide plate is gradually inclined upward along the horizontal direction. The present invention uses the inclined bubble divider to first guide the bubbles generated by the aerator to the branching component by the arc-shaped guide plate, and then is blocked by the inclined surface after contacting the branching component, so that the bubbles can move along the branching component, thereby increasing the residence time of the bubbles, and the accumulation of bubbles can be avoided by using the guide plate.

Description

Technical Field

[0001] The invention relates to the fields of aquaculture and environmental protection, in particular to a device for improving the efficiency of dissolved oxygen in water. Background Art

[0002] At present, live transport of aquatic fish generally adopts aeration stones or aeration tubes. After bubbles come out of the aerator, they move vertically to the water surface. The bubbles move fast in the water, stay for a short time, and have low dissolved oxygen efficiency, which leads to a reduction in the density of aquatic fish breeding or transportation. Taking sea bass as an example, sea bass is currently generally stored at low temperature and aerated with pure oxygen. Aeration generally adopts nanotube aeration, 65-liter foam box insulation, and the ratio of fish to water is generally 1:2.6 in summer. When sea bass is in a quiet state at 17°C, the oxygen consumption per hour is 70mg / Kg fish. Generally, oxygen is supplied through liquid oxygen tanks, and the oxygen supply per kilogram of fish per hour is about 2.5g, and the oxygen utilization rate is only 2% to 3%.

[0003] Experimental analysis found that factors affecting dissolved oxygen efficiency include initial bubble diameter, oxygen partial pressure, temperature, and dissolved oxygen diffusion efficiency. When using aeration tubes, the aeration points are concentrated. Due to the blocking effect of fish, the dissolved oxygen diffusion efficiency is low, and the dissolved oxygen in the incubator is uneven, which leads to low fish loading density. At the same time, the current aeration method - the aerator generates bubbles that are directly discharged into the water. The bubbles rise vertically in the water and stay in the water for too short a time. Most of the oxygen inside the bubbles is directly discharged into the air, resulting in oxygen waste. The aeration position is too concentrated, and the dissolved oxygen in the water is unbalanced. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an extended-range dissolved oxygen device to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The solution of the present invention to solve the technical problem is: an extended-range dissolved oxygen device, including a water storage container, an aerator is provided at the bottom of the water storage container, and also includes a bubble divider, the bubble divider is arranged above the aerator, the bubble divider includes a bracket, a branching component is provided on the bracket, an arc-shaped guide plate is provided at one end of the bracket, the guide plate is connected to the branching component, the guide plate faces the aerator, and the end of the branching component away from the guide plate gradually tilts upward along the horizontal direction.

[0006] The beneficial effects of the present invention are as follows: the present invention utilizes an inclined bubble divider so that the bubbles generated by the aerator are first guided to the branch component by the arc-shaped guide plate, and then blocked by the inclined surface after contacting the branch component, so that the bubbles can move along the branch component, thereby increasing the residence time of the bubbles, and the use of the guide plate can avoid the accumulation of bubbles.

[0007] As a further improvement of the above technical solution, the row branching component is a mesh, and the row branching component is fixed on the upper surface of the bracket.

[0008] The branching member adopts a mesh structure, wherein the mesh is provided with a plurality of mesh holes, the apertures of which are smaller than the outer diameter of the bubbles generated by the aerator. Thus, the bubbles can move obliquely upward along the branching member. Moreover, during the movement, the bubbles can mix with the water to evenly blend the oxygen in the bubbles into the water.

[0009] As a further improvement of the above technical solution, the support is provided with a grid, the grid is located on the lower surface of the branching component, the grid and the branching component form a plurality of bubble channels, and a grid track is provided on the branching device to prevent the bubbles from merging horizontally.

[0010] As a further improvement of the above technical solution, there are several guide plates, and each of the bubble channels is provided with the guide plate at its head end. The guide plates are provided separately, which can achieve a better guiding effect.

[0011] As a further improvement of the above technical solution, the water storage container is a box, the bubble divider also includes a mounting seat, the bracket is fixed on the mounting seat, and the mounting seat is mounted to the side wall of the box. The mounting seat can facilitate the installation of the bubble divider, and the mounting seat can be used to adjust the inclination angle of the bubble divider.

[0012] As a further improvement of the above technical solution, a support frame is further provided on the back of the bracket, and the row branch component abuts against the support frame. By adding the support frame, the installation strength of the row branch component can be improved.

[0013] As a further improvement of the above technical solution, the aerator includes an air outlet pipe, the center line of which is parallel to the length direction of the branching component. The air outlet angle of the aerator is parallel to the inclination angle of the fractal component, which can improve the oxygen dissolving efficiency of the bubbles.

[0014] As a further improvement of the above technical solution, there are more than two bubble dividers, and several of the bubble dividers are arranged up and down. Several dividers are arranged up and down at intervals, which can disperse dissolved oxygen and promote the diffusion of dissolved oxygen.

[0015] As a further improvement of the above technical solution, the bubble separator includes a spiral ascending portion. Part or all of the structure of the bubble separator is transformed into a spiral ascending shape, and the bubbles rise in a spiral shape by changing the ascending motion trajectory of the bubbles, thereby further improving the oxygen dissolving efficiency of the bubbles.

[0016] This technical solution can not only be used in aquaculture to increase the oxygen content in the water and improve the capacity of aquatic transportation; it can also be used for environmentally friendly water treatment, such as sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the bubble separator of the present invention;

[0020] Figure 3 It is a comparative effect diagram of Experiment 1 of the present invention;

[0021] Figure 4 It is a comparative effect diagram of the experiment of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. The preferred embodiments of the present invention are shown in the drawings. The purpose of the drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and the technical personnel in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution. At the same time, the various technical features in the invention can be combined interchangeably without conflicting with each other.

[0026] Taking the application of the device in aquatic transportation as an example, in Example 1, refer to Figure 1-2 , an extended-range dissolved oxygen device, comprising a rectangular box 100, a mounting seat is provided on one of the side walls of the box 100, an aerator 200 is provided at the bottom of the box 100, the aerator 200 is communicated with an external air source, and also comprises a bubble divider 300, the bubble divider 300 is arranged above the aerator 200, the bubble divider 300 comprises a bracket 310, the bracket 310 is fixed on the mounting seat, a branching member 320 is provided on the bracket 310, the branching member 320 is a mesh, the branching member 320 is fixed to the upper surface of the bracket 310 (for example, fixed by bonding), an arc-shaped guide plate 330 is provided at one end of the bracket 310, the lower end of the guide plate 330 is a certain distance away from the aerator 200, and the tangent direction of the upper end of the guide plate 330 is the same as that of the fractal member 320 The length directions of the branch members 320 are parallel to each other, and the guide plate 330 is connected to the branch member 320. The guide plate 330 faces the aerator 200, and the end of the branch member 320 away from the guide plate 330 gradually tilts upward along the horizontal direction. The bracket 310 is provided with a grille 340 extending along the length direction. The grille 340 is located on the lower surface of the branch member. The grille 340 and the branch member 320 form a plurality of air bubble channels 400. There are a plurality of guide plates 330, and the guide plate 330 is provided at the head end of each of the air bubble channels 400. The aerator 200 includes an air outlet pipe 210, and the center line of the air outlet pipe 210 is parallel to the length direction of the branch member 320.

[0027] According to Higbie's osmotic mass transfer theory, the double membrane method of gas film and liquid film is used to analyze the bubble mass transfer process using the one-dimensional unsteady diffusion equation and corresponding boundary conditions.

[0028]

[0029] C is the concentration of oxygen in water, D is the diffusion coefficient of oxygen in water, t is time, y is the direction of mass transfer, and the instantaneous flux of mass transfer

[0030]

[0031] During the short contact time t τ The average mass transfer flux within

[0032]

[0033] Mass transfer coefficient

[0034]

[0035] According to Professor Sheng Yiping's revised formula, the mass transfer coefficient

[0036]

[0037] d is the bubble diameter, v is the bubble velocity,

[0038] The total time T that the bubble stays in the water, the total dissolved oxygen content of a single bubble

[0039]

[0040] Obviously, improving the dissolved oxygen efficiency means increasing the oxygen flux in the two-phase of the bubble, prolonging the residence time of the bubble in the water and increasing the total surface area of ​​the bubble in the water.

[0041] This scheme is based on the above theory, and aims to improve the dissolved oxygen efficiency by prolonging the movement time of bubbles in the water body and increasing the total surface area of ​​the bubbles in the water.

[0042] At the same time, according to the bubble fusion theory, the fusion of two bubbles is related to the surface tension of the liquid and the distance between bubbles. Under the same liquid state, the surface tension is consistent. In order to reduce the fusion of bubbles, the distance between bubbles must be controlled. During the rising process of bubbles, the speed continues to increase, and the distance between the two bubbles in the vertical direction is also constantly increasing. When the bubble is captured by the parallel divider, the bubble is subjected to the reaction force of the divider. This force is along the normal direction of the divider, and acts on the bubble together with the buoyancy and viscosity. At this time, the bubble is compressed and the direction of its movement speed changes. At the same time, the divider has an inclination angle α with the horizontal direction. When the bubble is balanced on the divider, the normal component of the buoyancy Fcosα is equal to the supporting force. The larger α is, the smaller the supporting force is. Controlling this balanced force can achieve the following beneficial results: 1. Since the bubble is subjected to these two balanced forces, the bubble is compressed and its diameter is reduced, which is conducive to dissolved oxygen; 2. When α changes within a certain range, the tangential component of the bubble velocity v vsinα is large enough, vcosα is 0 under the action of the supporting force, and the distance to the next bubble will not be shortened too much, reducing the possibility of bubble fusion.

[0043] Because the guide plate is added and the shape of the guide plate is arc-shaped, the buoyancy and the thrust and viscosity of the separator are converted into the centripetal force of arc motion, and the linear velocity of the bubble remains unchanged. In this way, the distance between the two bubbles that arrive successively on the guide plate does not change. When the bubble moves out of the arc-shaped guide plate and enters the bubble channel, the separator has an angle with the horizontal direction, and the bubble accelerates upward or moves at a uniform speed under the joint action of the parallel component force and the viscosity force, thereby maintaining the distance between the front and rear bubbles. At the same time, in order to reduce the fusion of bubbles on the separator, a grid track is set on the separator to prevent the bubbles from merging horizontally.

[0044] In some embodiments, the bubble divider can be partially or completely set to a spiral rising shape. For example, the bracket 310 is made into a spiral shape, and then a flexible branching member 320 is set on the bracket 310, and then the grid on the bracket 310 is also matched to be set to a spiral shape, thereby realizing a spiral rising bubble divider. When the new bubble divider is adopted, the bubbles rise in the water in a spiral shape in the free state, so the probability of adjacent bubbles merging is relatively large. The grid track is set to prevent the bubbles from merging laterally. Making the divider into a spiral shape can change the direction of bubble movement. To achieve the change of the direction of bubble movement, there must be a normal support force so that the bubble force points in the centripetal direction. The normal force should have an angle with the z-axis in space. The implementation method can set the grid track or the divider to be tilted to the z-axis.

[0045] At the same time, the aerator used in the present invention is a nano aerator. The bubbles of the nano aeration tube are linear, and the bubbles are distributed along the pipeline. After the bubbles are formed, they are captured by the inclined surface of the fractal component and move upward along the inclined surface. At the same position, the bubbles captured first move first, and the bubbles captured later move later. In this way, the accumulation and fusion of multiple bubbles can be avoided, thereby reducing the total surface area of ​​the bubbles, which is conducive to the dissolution of oxygen inside the bubbles in the water. As the bubble travels along the inclined surface, the dissolved oxygen content in the water increases greatly.

[0046] For this device, experiments were also conducted to prove that:

[0047] Experimental verification:

[0048] 1. No-load comparison test:

[0049] Comparative experiment 1, aeration device nanotubes and extended dissolved oxygen + nanotubes, two 65-liter incubators, each with 52 kg of tap water for 2 days; oxygen supply device: online oxygen generator, oxygen concentration 90%, flow rate 500 ml / min; dissolved oxygen detector, recording data every minute, 0 minutes for oxygen supply, 0 minutes for initial data, dissolved oxygen meter reading c, total dissolved oxygen Ctotal = (ct-c0) x52, average dissolved oxygen per minute C = 52x(ct-c0) / t

[0050] Time (minutes) No. 0 dissolved oxygen content C (mg / min) A dissolved oxygen content C (mg / min) Ratio C / B 0 0.0 0.0 0.0 1 20.0 27.0 1.4 2 12.5 37.8 3.0 3 16.7 39.6 2.4 4 18.8 35.1 1.9 5 20.0 41.0 2.1 6 20.0 40.5 2.0 7 21.4 39.3 1.8 8 21.3 39.8 1.9 9 21.7 40.2 1.9 10 21.0 38.9 1.9 11 21.8 39.3 1.8 12 21.3 37.4 1.8 13 21.5 36.6 1.7 14 21.1 36.3 1.7 15 21.3 35.6 1.7 16 21.3 35.1 1.7 17 20.6 34.9 1.7 18 20.6 34.2 1.7 19 20.8 34.4 1.7 20 19.8 32.9 1.7

[0051] Nanotube direct aeration test is referred to as No. 0, and nanotube + extended dissolved oxygen test is referred to as No. A. Figure 3 Comparison chart shown.

[0052] Comparative experiment 2, aeration device nanotubes and extended dissolved oxygen + nanotubes, two 65-liter incubators, each with 52 kg of tap water for 4 days; oxygen supply device: online oxygen generator, oxygen concentration 90%, flow rate 500 ml / min; dissolved oxygen detector, recording data every minute, 0 minute for oxygen supply start, 0 minute for initial data, dissolved oxygen meter reading is c, total dissolved oxygen content Ctotal = (ct-c0)x52, average dissolved oxygen content per minute C = 52x(ct-c0) / t.

[0053] Time (minutes) 0 Dissolved oxygen content B (mg / min) A dissolved oxygen content C (mg / min) Ratio C / B 0 0.0 0.0 0.0 1 50.0 91.8 1.8 2 35.0 64.8 1.9 3 30.0 52.2 1.7 4 28.8 44.6 1.5 5 29.0 44.3 1.5 6 24.2 42.3 1.8 7 25.7 44.0 1.7 8 23.8 42.5 1.8 9 23.9 40.8 1.7 10 22.5 40.0 1.8 11 23.6 38.8 1.6 12 23.3 36.9 1.6 13 21.9 36.6 1.7 14 22.5 35.9 1.6 15 21.7 35.3 1.6 16 21.9 34.1 1.6

[0054] Nanotube direct aeration test is referred to as No. 0, and nanotube + extended dissolved oxygen test is referred to as No. A. Figure 4 Comparison chart shown.

[0055] According to the data of two experiments, the dissolved oxygen content after using the device of this scheme is more than 1.6 times that of simple nanotube aeration.

[0056] Through the above comparison, it can be seen that the extended-range dissolved oxygen device of this scheme can not only reduce the transportation cost, but also improve the utilization efficiency of oxygen, and the overall economic benefits are better.

[0057] As a further preferred embodiment, a support frame (not shown in the figure) is further provided on the back side of the bracket 310, and the row branching member abuts against the support frame.

[0058] As a further preferred embodiment, there are more than two bubble dividers 300, and several of the bubble dividers are arranged up and down.

[0059] When the extended-range dissolved oxygen device is applied to the field of environmental protection, the water storage container can be a pond, a pool, a river, a lake, etc. By using the extended-range dissolved oxygen device in the water body, the oxygen content in the water body is effectively increased, thereby achieving improvement of the water environment.

[0060] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An extended-range dissolved oxygen device, comprising a water storage container, wherein an aerator is provided at the bottom of the water storage container, characterized in that: It also includes a bubble divider, which is arranged above the aerator, and includes a bracket, a branching component is provided on the bracket, an arc-shaped guide plate is provided at one end of the bracket, the guide plate is connected to the branching component, the guide plate faces the aerator, and the end of the branching component away from the guide plate gradually tilts upward along the horizontal direction; the branching component is a mesh, and the branching component is fixed on the upper surface of the bracket; a grille is provided on the bracket, and the grille is located on the lower surface of the branching component, and the grille and the branching component form a plurality of bubble channels; the aerator includes an air outlet pipe, and the center line of the air outlet pipe is parallel to the length direction of the branching component; the bubble divider includes a spiral rising part.

2. The extended-range dissolved oxygen device according to claim 1, characterized in that: There are a plurality of guide plates, and the head end of each of the bubble channels is provided with the guide plate.

3. The extended-range dissolved oxygen device according to claim 1, characterized in that: The water storage container is a box body, and the bubble separator also includes a mounting seat, the bracket is fixed on the mounting seat, and the mounting seat is installed to the side wall of the box body.

4. The extended-range dissolved oxygen device according to claim 1, characterized in that: A support frame is also provided on the back of the bracket, and the row branching component abuts against the support frame.

5. The extended-range dissolved oxygen device according to claim 1, characterized in that: There are more than two bubble dividers, and several of the bubble dividers are arranged up and down.

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