Gas-liquid mixing device capable of generating multi-size bubbles

Abstract

The invention relates to the technical field of gas-liquid reaction devices, in particular to a gas-liquid mixing device capable of generating multi-size bubbles, the gas-liquid mixing device comprises a first mixing section and a second mixing section, the second mixing section comprises an outer pipe, and an inner pipe is inserted into the outer pipe; a first channel is formed in the inner pipe, and a second channel is formed between the inner pipe and the outer pipe; or, a second channel is formed in the inner pipe, and a first channel is formed between the inner pipe and the outer pipe; the inlet area of the second channel accounts for 5-15% of the inlet area of the outer pipe A vortex flow guide assembly is arranged in the first channel, and part of millimeter-scale bubbles enter the first channel and are broken into micro-nano-scale bubbles by the vortex flow guide assembly; and the rest millimeter-scale bubbles enter the second channel and are mixed with the micro-nano-scale bubbles flowing out of the first channel at the outlet of the outer pipe. A gas-liquid mixed flow comprising millimeter-scale bubbles and micro-nano-scale bubbles is formed, and the millimeter-scale bubbles can stir the micro-nano-scale bubbles, so that the gas-liquid reaction speed is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of gas-liquid reaction devices, and in particular to a gas-liquid mixing device for generating bubbles of multiple sizes. Background Art

[0002] In the chemical and environmental protection fields, gas-liquid mixing is common, such as in gas-liquid reactions and wastewater treatment. This mixing often significantly impacts the effectiveness of reactions and wastewater treatment. Micro- and nanobubbles hold great potential in industrial applications due to their orders-of-magnitude increased interfacial area, long residence times, high mass transfer efficiency, increased rigidity, and ability to generate hydroxyl radicals to initiate or accelerate reactions.

[0003] Publication number CN118634671A discloses a swirl-type micro-nano bubble generator. In the first structure provided by the invention, a guide cone is inserted into the swirl chamber and the rectifying chamber to form an annular circulation channel. Under the condition of the same cross-sectional area, since the guide cone occupies the central position, the outer diameter of the circulation channel is much larger than that of the cylindrical channel without the guide cone, thereby achieving a higher diameter reduction ratio, increasing the degree of reduction of the liquid swirl diameter, doubling the liquid rotation speed and rotation intensity, and further significantly increasing the degree of micro-nanoization of bubbles in the bubble cutting tube; in the second structure provided by the invention, by means of the opening of the guide cone cylindrical section to disperse gas, the scaling structure formed by the swirl chamber and the rectifying chamber to break the bubbles, and the bubble cutting tube to break the bubbles, the step-by-step micro-nanoization of bubbles under the action of multiple structures can be achieved, thereby continuously reducing the bubble size and ensuring the uniformity of the bubble size. However, the above-mentioned swirl-type micro-nano bubble generator can only generate micro-nano bubbles in the annular channel, etc., and the excessive density of micro-nano bubbles is not conducive to the occurrence of gas-liquid reaction. Summary of the Invention

[0004] In order to solve the problem that the density of micro-nano bubbles in existing gas-liquid reaction devices is too high and is not conducive to gas-liquid reaction, the purpose of the present invention is to provide a gas-liquid mixing device that generates bubbles of multiple sizes.

[0005] The technical solution provided by the present invention is:

[0006] A gas-liquid mixing device for generating bubbles of multiple sizes, comprising:

[0007] a first mixing section, the first mixing section being used to mix millimeter-sized bubbles in the liquid;

[0008] a second mixing section, the second mixing section comprising an outer tube with an inner tube inserted therein;

[0009] A first channel is formed inside the inner tube, and a second channel is formed between the inner tube and the outer tube; or a second channel is formed inside the inner tube, and a first channel is formed between the inner tube and the outer tube;

[0010] The inlet area of ​​the second channel accounts for 5% to 15% of the inlet area of ​​the outer tube;

[0011] A vortex guide assembly is provided in the first channel, and some millimeter-sized bubbles enter the first channel and are broken into micro-nano-sized bubbles by the vortex guide assembly;

[0012] The remaining millimeter-scale bubbles enter the second channel and mix with the micro-nanoscale bubbles flowing out of the first channel at the outlet of the outer tube.

[0013] As an optional technical solution of the first aspect, in the first channel, multiple layers of vortex guide components are arranged along the axial direction of the inner tube or the axial direction of the outer tube; each layer of vortex guide components includes multiple convex parts and concave parts; the convex parts correspond to the concave parts and have different installation heights.

[0014] Optionally, a plane perpendicular to the axial direction of the inner tube or the axial direction of the outer tube is taken as the projection plane;

[0015] In each layer of the vortex guide assembly, the angle between the center lines of the corresponding convex parts and the concave parts projected on the projection surface is recorded as a, and the value range of a is 0° to 25°.

[0016] Furthermore, in each layer of the vortex guide assembly, the distance between the corresponding convex parts and concave parts on the projection surface is recorded as d1; the radial dimension of the first channel is recorded as d2; and the ratio of d1 to d2 ranges from 1 / 3 to 2 / 3.

[0017] Furthermore, in the axial direction of the inner tube or the axial direction of the outer tube, the distance between two adjacent layers of vortex guide components is recorded as d3; the radial dimension of the first channel is recorded as d2;

[0018] The ratio of d3 to d2 ranges from 1 to 3.

[0019] Optionally, in the axial direction of the inner tube or the axial direction of the outer tube, the convex parts and concave parts of two adjacent layers are arranged correspondingly or staggered; the angle between the center lines of adjacent convex parts and concave parts in the same layer is recorded as b; when the convex parts and concave parts of two adjacent layers are staggered, a plane perpendicular to the axial direction of the inner tube or the axial direction of the outer tube is taken as the projection plane, and the convex parts and concave parts of two adjacent layers are projected on the projection plane, and the angle between the center lines of adjacent projections is recorded as c; where c = (1 / 3 to 2 / 3)b.

[0020] Optionally, the convex part and the concave part are both arc-shaped, and the central angle θ ranges from 35° to 65°.

[0021] Optionally, the convex members and the concave members correspond one to one; and / or, each convex member corresponds to a plurality of concave members; and / or, each concave member corresponds to a plurality of convex members.

[0022] As an optional technical solution, the first mixing section includes a contraction chamber, a mixing chamber, a diffusion chamber, and a connecting chamber connected in sequence; the contraction chamber is connected to a liquid inlet pipe and an air inlet pipe.

[0023] Optionally, the liquid inlet pipe orifice is conical, and the cone angle of the conical nozzle is 15° to 25°.

[0024] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0025] The gas-liquid mixing device for generating bubbles of multiple sizes proposed by the present invention generates bubbles of approximately 1 to 3 mm in a first mixing section, wherein some of the millimeter-sized bubbles enter the second channel of the second mixing section, and the remaining millimeter-sized bubbles enter the first channel of the second mixing section. The millimeter-sized bubbles entering the first channel are broken into micro-nano-sized bubbles by the vortex guide component provided in the first channel, and finally the millimeter-sized bubbles are mixed with the micro-nano-sized bubbles. Since some of the millimeter-sized bubbles are retained, the millimeter-sized bubbles can stir the micro-nano-sized bubbles, thereby accelerating the gas-liquid reaction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a gas-liquid mixing device in one embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of an embodiment of the present application in which the interior of the inner tube serves as the first channel;

[0028] Figure 3 This is a schematic diagram of the distance d2 and the distance d3 in one embodiment of the present application;

[0029] Figure 4 This is a schematic diagram of the distance d1 in one embodiment of the present application;

[0030] Figure 5 This is a schematic diagram of angle c in one embodiment of the present application;

[0031] Figure 6 This is a schematic diagram of a gas-liquid mixing device in another embodiment of the present application;

[0032] Figure 7 This is a schematic diagram of another embodiment of the present application in which the interior of the inner tube serves as the second channel;

[0033] Figure 8 This is a schematic diagram of the distance d2 and the distance d3 in another embodiment of the present application;

[0034] Figure 9 This is a schematic diagram of angle a in another embodiment of the present application;

[0035] Figure 10 This is a schematic diagram of the correspondence between a convex member and two concave members in one embodiment of the present application.

[0036] Explanation of the numbers in the schematic diagram:

[0037] Contraction chamber 100 , liquid inlet pipe 110 , air inlet pipe 120 , mixing chamber 200 , diffusion chamber 300 , connecting chamber 400 , second mixing section 500 , outer tube 510 , inner tube 520 , concave piece 530 , convex piece 540 . DETAILED DESCRIPTION

[0038] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0039] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology. They are not used to limit the conditions for implementation of the present invention and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0040] In one embodiment, if Figure 1 、 6 As shown, the present application proposes a gas-liquid mixing device for generating multi-size bubbles, comprising a first mixing section and a second mixing section 500, wherein gas and liquid are introduced into the first mixing section, and then a gas-liquid mixed flow is generated, in which the gas exists in the form of millimeter-sized bubbles, for example, the bubbles are 1 to 3 mm.

[0041] The second mixing section is connected to the first mixing section, and the gas-liquid mixed flow generated in the first mixing section can enter the second mixing section. The gas-liquid mixed flow is divided into two parts in the second mixing section. The millimeter-sized bubbles in one part of the gas-liquid mixed flow are further broken down into micro-nano-sized bubbles, while the millimeter-sized bubbles in the other part of the gas-liquid mixed flow are not processed. These millimeter-sized bubbles are mixed with the broken micro-nano-sized bubbles, resulting in a gas-liquid mixed flow in which millimeter-sized bubbles and micro-nano-sized bubbles coexist. Micro-nano-sized bubbles rise slowly and spend a longer time in the liquid phase. Millimeter-sized bubbles rise faster in the liquid. Using millimeter-sized bubbles to flexibly stir the surrounding micro-nano-sized bubbles, that is, utilizing the synergistic effect of large and small bubbles, further improves the gas-liquid mass transfer efficiency, thereby improving the reaction efficiency.

[0042] Specifically, the second mixing section includes an outer tube 510, with an inner tube 520 inserted inside the outer tube 510. It should be noted that the inner tube 520 and the outer tube 510 may or may not be coaxially arranged. When the inner tube 520 and the outer tube 510 are not coaxially arranged, the axes of the two may or may not be parallel.

[0043] The inner tube 520 and the outer tube 510 are both hollow tubes. When the inner tube 520 is inserted into the hollow cavity of the outer tube 510, Figure 1 As shown, a first channel is formed inside the inner tube 520, and a second channel is formed between the inner tube 520 and the outer tube 510; or as shown Figure 6 As shown, a second channel is formed inside the inner tube 520 , and a first channel is formed between the inner tube 520 and the outer tube 510 .

[0044] The inlet of the first channel and the inlet of the second channel are both communicated with the outlet of the first mixing section, and the outlet of the first channel is communicated with the outlet of the second channel.

[0045] A vortex guide assembly is provided within the first channel. A portion of the gas-liquid mixed flow carrying millimeter-sized bubbles flowing out of the outlet of the first mixing section enters the first channel. As these millimeter-sized bubbles flow within the first channel, they are broken down into micro- and nano-sized bubbles by the vortex guide assembly. The remaining millimeter-sized bubbles enter the second channel. These millimeter-sized bubbles remain intact and, after exiting the second channel, mix with the micro- and nano-sized bubbles flowing out of the first channel at the outlet of the outer tube 510, thereby forming a gas-liquid mixed flow containing both millimeter-sized and micro- and nano-sized bubbles.

[0046] If the resulting gas-liquid mixed flow, which contains both millimeter-sized and micro / nano-sized bubbles, contains too few millimeter-sized bubbles, it will be difficult for the millimeter-sized bubbles to stir the micro / nano-sized bubbles during their ascent, preventing further improvement in gas-liquid mass transfer efficiency. If the resulting gas-liquid mixed flow, which contains both millimeter-sized and micro / nano-sized bubbles, contains too many millimeter-sized bubbles, the interphase area will be small, similarly hindering gas-liquid reaction.

[0047] In this embodiment, the inlet area of ​​the second channel accounts for 5% to 15% of the inlet area of ​​the outer tube 510. That is, approximately 85% to 95% of the millimeter-scale bubbles generated in the first mixing section enter the first channel and are broken into micro-nano bubbles with a diameter of 100 nanometers to 800 microns, and the remaining 5% to 15% enter the second channel and remain as millimeter-scale bubbles. Finally, the millimeter-scale bubbles in the second channel are mixed with the micro-nanoscale bubbles in the first channel.

[0048] As an optional embodiment of the structure of the vortex guide assembly, Figure 3 、 8As shown, in the first channel, multiple layers of vortex guide components are arranged along the axial direction of the inner tube 520 or the axial direction of the outer tube 510. After the gas-liquid mixed flow enters the first channel, a vortex is formed under the action of the vortex guide components, and millimeter-level bubbles are broken in the vortex.

[0049] Specifically, if Figure 1-10 As shown, each layer of vortex guide assembly includes a plurality of convex parts 540 and concave parts 530. When a first channel is formed inside the inner tube 520 and a second channel is formed between the inner tube 520 and the outer tube 510, as shown in FIG. Figure 1-5 As shown in FIG. 10 , the concave member 530 and the convex member 540 are mounted on the inner wall of the first channel. When the second channel is formed inside the inner tube 520 and the first channel is formed between the inner tube 520 and the outer tube 510, as shown in FIG. Figure 6-9 As shown, the concave member 530 and the convex member 540 are installed on the outer wall of the inner tube 520 and the inner wall of the outer tube 510 .

[0050] In this embodiment, the convex member 540 and the concave member 530 correspond to each other and are installed at different heights, that is, at different positions in the axial direction of the inner tube 520 and the outer tube 510. This arrangement allows the gas-liquid mixed flow in the first channel to form a vortex under the action of the convex member 540 and the concave member 530, thereby breaking millimeter-scale bubbles into micro- and nano-scale bubbles.

[0051] Take the plane perpendicular to the axial direction of the inner tube 520 or the axial direction of the outer tube 510 as the projection plane. In each layer of the vortex guide assembly, the angle between the center lines of the corresponding convex part 540 and the concave part 530 on the projection plane is recorded as a. Figure 9 As shown, the value of a ranges from 0° to 25°, meaning the centerlines of the two can be parallel or at an angle. In this case, the convex member 540 corresponds to the concave member 530. One of the convex member 540 and the concave member 530 will guide the gas-liquid mixed flow to the other, and the other will guide the gas-liquid mixed flow to the next layer, and this cycle repeats, thereby forming a vortex in the gas-liquid mixed flow in the first channel.

[0052] like Figure 3 、 4 As shown in Figure 8, in each layer of the vortex guide assembly, the distance between the corresponding convex part 540 and the concave part 530 on the projection surface is recorded as d1, the radial size of the first channel is recorded as d2, and the ratio of d1 to d2 ranges from 1 / 3 to 2 / 3, such as 1 / 3, or 1 / 2, or 2 / 3. At this time, the gas-liquid mixture can form micro-nano vortices and maintain a higher flow rate, and the processing efficiency is higher.

[0053] In the axial direction of the inner tube 520 or the outer tube 510, the distance between two adjacent layers of vortex guide assemblies is denoted as d3, and the radial dimension of the first channel is denoted as d2. The ratio of d3 to d2 ranges from 1 to 3, such as 1, 1.5, or 2.6. In this configuration, the fluid in the first channel is fully guided by the convex and concave members 540 and 530 on both sides of the channel, and is also continuously guided by the vortex guide assemblies of adjacent layers.

[0054] In the axial direction of the inner tube 520 or the axial direction of the outer tube 510, the convex parts 540 and the concave parts 530 of the two adjacent layers are arranged in a corresponding or staggered manner. Corresponding arrangement means that the convex parts 540 and the concave parts 530 of the two adjacent layers installed on the inner wall of the same side are corresponding in the axial direction. Staggered arrangement means that the convex parts 540 and the concave parts 530 of the two adjacent layers installed on the inner wall of the same side can be offset in the axial direction. Figure 5 As shown, Figure 5 The solid line represents the vortex guide assembly of the upper layer, and the dotted line represents the vortex guide assembly of the lower layer.

[0055] The included angle between the center lines of adjacent convex parts 540 and concave parts 530 in the same layer is recorded as b. When the convex parts 540 and concave parts 530 of two adjacent layers are arranged alternately, a plane perpendicular to the axial direction of the inner tube 520 or the axial direction of the outer tube 510 is taken as the projection surface, and the convex parts 540 and concave parts 530 of two adjacent layers are projected on the projection surface. The included angle between the center lines of adjacent projections is recorded as c, where c = (1 / 3 to 2 / 3) b. At this time, it is conducive to the gas-liquid mixture in the first channel to fully flow through the vortex guide component to form a vortex, and to break it into micro-nano bubbles.

[0056] In one embodiment, the convex member 540 and the concave member 530 are both arc-shaped, such as Figure 7 As shown, the value range of the central angle θ is 35° to 65°.

[0057] It should be noted that the convex part 540 can be one, two or more of a circular arc part, a hyperbolic arc part, and an arc part with an Archimedean spiral; the concave part 530 can be one, two or more of a circular arc part, a hyperbolic arc part, and an arc part with an Archimedean spiral.

[0058] As an optional embodiment, the convex parts 540 and the concave parts 530 correspond to each other one by one, or each convex part 540 corresponds to a plurality of concave parts 530, or each concave part 530 corresponds to a plurality of convex parts 540. Figure 10 As shown, one convex member 540 corresponds to two concave members 530 .

[0059] It should be noted that the vortex guide assembly is not limited to the above-mentioned structure, and other structures in the prior art that can break millimeter-level bubbles into micro-nano-level bubbles are applicable to the present application.

[0060] As an optional solution, the first mixing section can adopt a structure similar to a Venturi tube, namely, the first mixing section includes a sequentially connected contraction chamber 100, a mixing chamber 200, a diffusion chamber 300, and a connecting chamber 400. The contraction chamber 100 is connected to a liquid inlet pipe 110 and an air inlet pipe 120. After entering the contraction chamber 100, the gas and liquid sequentially enter the mixing chamber 200, the diffusion chamber 300, and the connecting chamber 400, ultimately forming a gas-liquid mixed flow carrying millimeter-scale bubbles. This is a relatively mature technology in the prior art and will not be elaborated here.

[0061] The nozzle of the liquid inlet pipe 110 is conical, and the cone angle of the conical nozzle is 15° to 25°.

[0062] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A gas-liquid mixing device for generating bubbles of multiple sizes, characterized in that: include: a first mixing section, the first mixing section being used to mix millimeter-sized bubbles in the liquid; A second mixing section (500), the second mixing section (500) comprising an outer tube (510), an inner tube (520) being inserted into the outer tube (510); A first channel is formed inside the inner tube (520), and a second channel is formed between the inner tube (520) and the outer tube (510); or a second channel is formed inside the inner tube (520), and a first channel is formed between the inner tube (520) and the outer tube (510); The inlet area of ​​the second channel accounts for 5% to 15% of the inlet area of ​​the outer tube (510); A vortex guide assembly is provided in the first channel, and some millimeter-sized bubbles enter the first channel and are broken into micro-nano-sized bubbles by the vortex guide assembly; The remaining millimeter-scale bubbles enter the second channel and mix with the micro-nanoscale bubbles flowing out of the first channel at the outlet of the outer tube (510).

2. The gas-liquid mixing device for generating multi-sized bubbles according to claim 1, characterized in that: In the first channel, multiple layers of vortex guide components are arranged along the axial direction of the inner tube (520) or the axial direction of the outer tube (510); Each layer of vortex guide components includes a plurality of convex parts (540) and concave parts (530); the convex parts (540) correspond to the concave parts (530) and are installed at different heights.

3. The gas-liquid mixing device for generating multi-sized bubbles according to claim 2, characterized in that: A plane perpendicular to the axial direction of the inner tube (520) or the axial direction of the outer tube (510) is taken as the projection plane; In each layer of the vortex guide assembly, the angle between the center lines of the corresponding convex part (540) and the concave part (530) projected on the projection surface is recorded as a, and the value range of a is 0° to 25°.

4. The gas-liquid mixing device for generating multi-sized bubbles according to claim 3, characterized in that: In each layer of the vortex guide assembly, the distance between the corresponding convex parts (540) and concave parts (530) on the projection surface is recorded as d1; The radial dimension of the first channel is denoted as d2; The ratio of d1 to d2 ranges from 1 / 3 to 2 / 3.

5. The gas-liquid mixing device for generating multi-sized bubbles according to claim 4, characterized in that: In the axial direction of the inner tube (520) or the axial direction of the outer tube (510), the distance between two adjacent layers of vortex guide components is recorded as d3; The radial dimension of the first channel is denoted as d2; The ratio of d3 to d2 ranges from 1 to 3.

6. The gas-liquid mixing device for generating multi-sized bubbles according to claim 2, characterized in that: In the axial direction of the inner tube (520) or the axial direction of the outer tube (510), the convex parts (540) and the concave parts (530) of two adjacent layers are arranged correspondingly or staggered; The included angle between the center lines of adjacent convex pieces (540) and concave pieces (530) in the same layer is recorded as b; when the convex pieces (540) and concave pieces (530) of two adjacent layers are arranged alternately, a plane perpendicular to the axial direction of the inner tube (520) or the axial direction of the outer tube (510) is taken as the projection plane, and the convex pieces (540) and concave pieces (530) of the two adjacent layers are projected on the projection plane, and the included angle between the center lines of the adjacent projections is recorded as c; Among them, c = (1 / 3 ~ 2 / 3) b.

7. The gas-liquid mixing device for generating multi-sized bubbles according to claim 2, characterized in that: The convex part (540) and the concave part (530) are both arc-shaped, and the value range of the central angle θ is 35° to 65°.

8. The gas-liquid mixing device for generating multi-sized bubbles according to claim 2, characterized in that: The convex part (540) and the concave part (530) correspond one to one; and / or, each convex member (540) corresponds to a plurality of concave members (530); And / or, each concave member (530) corresponds to a plurality of convex members (540).

9. The gas-liquid mixing device for generating multi-sized bubbles according to claim 1, characterized in that: The first mixing section comprises a contraction chamber (100), a mixing chamber (200), a diffusion chamber (300), and a connecting chamber (400) which are connected in sequence; The contraction chamber (100) is connected to a liquid inlet pipe (110) and an air inlet pipe (120).

10. The gas-liquid mixing device for generating bubbles of multiple sizes according to claim 9, characterized in that: The liquid inlet pipe (110) has a conical orifice, and the cone angle of the conical nozzle is 15° to 25°.

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