Gas-liquid jetting device and method of manufacture

Abstract

A gas-liquid injection device comprises a body and a liquid channel, a bypass channel, a gas inlet, a gas-liquid mixing chamber and a gas-liquid mixing channel in the body, wherein the body comprises opposite inlet and outlet end faces, the liquid channel comprises a liquid inlet opening on the inlet end face and a channel outlet arranged on the outlet end face, and comprises a converging section and a throat section arranged downstream of the liquid inlet in sequence; one end of the bypass channel opens on the converging section, and the other end is connected with the gas-liquid mixing chamber, which bypasses the liquid flowing in the liquid channel to the gas-liquid mixing chamber; the gas-liquid mixing chamber is located at the periphery of the liquid channel; the gas inlet opens on the inlet end face and is located below the liquid inlet, and downstream of the gas inlet, the gas-liquid mixing chamber and the gas-liquid mixing channel are arranged in sequence, the gas flowing in through the gas inlet mixes with the liquid in the gas-liquid mixing chamber to form a gas-liquid mixed flow, which then flows out through the gas-liquid mixing channel; the gas-liquid mixing channel is located below the liquid channel.

Description

Technical Field

[0001] This invention relates to an apparatus for increasing gas-liquid mass transfer in a liquid and a method for preparing the apparatus, specifically to a gas-liquid injection device and a method for preparing the gas-liquid injection device. Background Technology

[0002] The interaction between the gas and liquid phases is a crucial step in many biological and chemical processes. For example, in wastewater oxidation and aquaculture, dissolved oxygen in the water is continuously consumed, necessitating the replenishment of oxygen to maintain the efficient operation of these processes. Increased contact between oxygen and water leads to more efficient gas-liquid mass transfer, which is more conducive to oxidation reactions or aquaculture. Equipment that enhances the efficiency of gas-liquid mass transfer has long been a subject of industrial research.

[0003] CN109475828B discloses a nanobubble generating nozzle and a nanobubble generating device, including an inlet, an outlet, and a nanobubble generating structure located between the two. It uses the principle of pressure dissolution to repeatedly pressurize and release bubbles, thereby ejecting fine bubbles.

[0004] CN113307352B discloses an apparatus and method for enhancing the oxidation of sulfur-containing wastewater, including a gas-liquid injection unit disposed at the bottom of an oxidation reactor. The gas-liquid injection unit includes one or more stages of distribution pipes, each of which includes a liquid-phase annular distribution pipe, a gas-phase annular distribution pipe, and several gas-liquid mixing nozzles, for generating a cluster of microbubbles at the bottom of the reactor to increase the gas-liquid mass transfer area.

[0005] Existing technologies generally increase mass transfer between the gas and liquid phases by reducing the volume of bubbles, but the devices are complex in structure and have many parts, making them only suitable for conventional manufacturing and installation methods.

[0006] In view of this, how to design a new gas-liquid injection device that can increase the contact between the gas and liquid phases in multiple ways, while also being easy to manufacture and low in cost, is a problem that relevant technical personnel in the industry urgently need to solve. Summary of the Invention

[0007] The purpose of this invention is to improve the existing technology by simply reducing the volume of bubbles to improve gas-liquid mass transfer, and to avoid the complex structure, difficult manufacturing and high cost of the jetting device. It provides a low-cost gas-liquid jetting device that can be 3D printed in one piece, which prolongs the gas-liquid contact time and achieves good gas-liquid mass transfer effect.

[0008] In one aspect, the present invention provides a gas-liquid injection device for injecting at least one gas and at least one liquid into a liquid environment. The device includes a main body, within which a liquid channel, a bypass channel, a gas inlet, a gas-liquid mixing chamber, and a gas-liquid mixing channel are disposed. The main body includes opposing inlet and outlet end faces. The liquid channel includes a liquid inlet opening onto the inlet end face and a channel outlet disposed on the outlet end face, and includes a tapering section and a throat section sequentially disposed downstream of the liquid inlet. One end of the bypass channel opens into the tapering section, and the other end is connected to the gas-liquid mixing chamber. The bypass channel diverts the liquid flowing in the liquid channel to the gas-liquid mixing chamber; the gas-liquid mixing chamber is located on the periphery of the liquid channel; the gas inlet opens on the inlet end face and is located below the liquid inlet; the gas-liquid mixing chamber and the gas-liquid mixing channel are sequentially arranged downstream of the gas inlet; the gas flowing in through the gas inlet enters the gas-liquid mixing chamber and mixes with the liquid in the gas-liquid mixing chamber to form a gas-liquid mixed stream; the gas-liquid mixed stream flows out through the gas-liquid mixing channel; the gas-liquid mixing channel is located below the liquid channel. The outlet of the gas-liquid mixing channel is configured such that, on the outer side of the outlet end face, bubbles of the at least one gas ejected through the gas-liquid mixing channel pass through the stream containing at least one liquid ejected from the channel outlet during their buoyancy.

[0009] Furthermore, the connection points between the bypass channel and the converging section and the gas-liquid mixing chamber are all located on the central axis plane of the liquid channel, which is parallel to the horizontal plane; the number of bypass channels is greater than or equal to one, and they are symmetrically distributed relative to the central axis plane of the liquid channel, which is perpendicular to the horizontal plane; the bypass channels are smoothly connected to the converging section.

[0010] Furthermore, an external liquid source and a supply pipe connected to the external liquid source are provided, the supply pipe being installed at the liquid inlet of the liquid channel; the liquid flow velocity at the liquid inlet is no greater than 5 m / s, and at the channel outlet it is between 5 m / s and 25 m / s; the liquid flow rate is 10-100 m³ / s. 3 / h, the liquid pressure at the liquid inlet is 0.2-3.0 Barg.

[0011] Furthermore, an external gas source and a gas supply pipeline connected to the external gas source are provided, the gas supply pipeline being installed at the gas inlet; the gas pressure in the gas supply pipeline is 1.5-15 Barg, and the gas flow rate is 0.2-20 kg / h.

[0012] Furthermore, the gas flows into the gas-liquid mixing chamber (05) through an orifice with a diameter between 0.5 and 2.5 mm, and the gas velocity when entering the gas-liquid mixing chamber is close to or equal to the speed of sound; the orifice is located on the end of the gas supply pipe that contacts the gas-liquid mixing chamber.

[0013] The liquid flow rate entering the gas-liquid mixing chamber is 2%-20% of the total liquid flow rate entering the gas-liquid injection device; the ratio of injected liquid to gas is 1.0-30 m³ / s. 3 The liquid corresponds to 1 kg of gas; the liquid contains water and the gas contains oxygen.

[0014] In another aspect, the outlet of the gas-liquid mixing channel is located in the throat section of the first liquid channel; the shortest distance between the outlet of the gas-liquid mixing channel and the outlet end face is no greater than 5-25mm.

[0015] In another aspect, the outlet of the gas-liquid mixing channel is located on the outlet end face of the main body; the shortest distance between the outlet of the gas-liquid mixing channel and the channel outlet on the outlet end face is 5-25mm.

[0016] In another aspect, the present invention also discloses a method for preparing the above-mentioned gas-liquid jetting device by 3D printing, wherein the 3D printing material includes ABS, PLA, NYLON, and ASA.

[0017] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0018] 1. Pressurized gas and liquid mix in the gas-liquid mixing chamber to generate microbubbles. After the microbubbles are injected into the liquid environment such as sewage treatment tanks and ponds, the gas-liquid contact area is increased.

[0019] 2. The tiny bubbles at the outlet of the jetting device must pass through the high-speed liquid stream ejected from the channel outlet during the buoyancy process. On the one hand, they are cut into smaller bubbles, further increasing the gas-liquid contact time; on the other hand, the path and time of bubble buoyancy are extended, i.e., the gas-liquid contact time. The two work together to improve the gas-liquid mass transfer efficiency.

[0020] 3. The gas-liquid jetting device of the present invention can be made of 3D printed polymer materials, which greatly reduces manufacturing and operating costs, while being easy to install, convenient to maintain and applicable to a variety of occasions. Attached Figure Description

[0021] The advantages and spirit of the present invention can be further understood through the following detailed description and accompanying drawings. Those skilled in the art will understand that the drawings and embodiments do not constitute any limitation on the present invention. The same reference numerals in the drawings correspond to the same or equivalent components.

[0022] Figure 1 This is a side cross-sectional view of the gas-liquid injection device in Example 1;

[0023] Figure 2 This is a side cross-sectional view of the gas-liquid injection device in Example 2;

[0024] Figure 3 This is a cross-sectional view of the gas-liquid injection device in Example 1 or 2 taken along the AA direction;

[0025] In the diagram: 01-Main body; 02-Liquid channel; 03-Bypass channel; 04-Gas inlet; 05-Gas-liquid mixing chamber; 06-Gas-liquid mixing channel; 07-Inlet end face; 08-Outlet end face; 09-Liquid inlet; 10-Channel outlet; 11-Converging section; 12-Throat section; 13a, 13b-Outlet of gas-liquid mixing channel; 14-Liquid supply pipe; 15-Gas supply pipe; 16-Orifice. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "assembly" and "connection" refer to forming a component that seals against fluids such as liquids and gases by combining two or more parts. Assembly and connection methods include welding, flange connections, bolting, bonding, or integral molding, with bonding or integral molding being preferred. The terms "connected" and "interconnected" refer to a state between two or more parts where fluids such as liquids and gases can flow.

[0028] The terms "downstream" and "upstream" refer to the direction of liquid or gas flow. The process of liquid or gas flowing from the inlet to the outlet is the process of flowing from upstream to downstream.

[0029] Terms indicating orientation, such as "below," "above," "parallel to the horizontal plane," and "perpendicular to the horizontal plane," all correspond to the orientation of the gas-liquid injection device of the present invention in normal use scenarios.

[0030] Furthermore, qualifiers such as "one" appearing in this document do not refer to a quantity limitation, but rather describe technical features not mentioned previously. Similarly, unless a noun is modified by a specific quantifier, it should be considered in this document as including both singular and plural forms; the technical solution may include either a singular or plural number of the technical feature.

[0031] It should be understood that in this invention, "at least one item" refers to one or more, and "more than one" refers to 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 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 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.

[0032] The gas-liquid injection device of this invention is completely immersed in a liquid environment during use. It comprises a body, the cavity of which forms a liquid channel, a bypass channel, a gas inlet, a gas-liquid mixing chamber, and a gas-liquid mixing channel. The body has two opposing end faces: an inlet end face and an outlet end face. "Opposite" means the two end faces are approximately parallel. The liquid channel is used to transport the liquid to be injected from the inlet end face to the outlet end face, and from upstream to downstream consists of a liquid inlet opening on the inlet end face, a tapering section, a throat section, and a channel outlet located on the outlet end face. Preferably, the liquid inlet extends into the body for a certain distance. The tapering section refers to a section of the channel whose cross-sectional area gradually and smoothly decreases along the fluid flow direction, allowing fluid to flow; for example, it can be a truncated conical orifice. The throat section refers to a section of the channel whose cross-sectional area remains constant; for example, it can be a straight circular orifice. The cross-sectional area of ​​the throat section does not exceed the cross-sectional area of ​​the tapering section, for example, it is equal to the minimum cross-sectional area of ​​the tapering section. As the liquid flows through the converging section, based on the Venturi effect, the flow velocity increases and the pressure decreases as the orifice diameter decreases, for example; the converging section can be considered as part of a cone. The cone angle of this cone is 2.0-5.0 degrees. When the liquid flows through the throat section, since the channel diameter remains constant, the liquid maintains maximum flow velocity and minimum pressure, and is ejected from the channel outlet. The liquid velocity at the inlet is no greater than 5 m / s, and at the channel outlet it is 5-25 m / s.

[0033] A gas-liquid mixing chamber is arranged around the liquid channel. The gas-liquid mixing chamber is preferably annular and connected to the liquid channel via a bypass channel. The connection point between the bypass channel and the liquid channel is located at the converging section of the liquid channel. The number of bypass channels is greater than or equal to one, preferably three. When the gas-liquid injection device is in use, the central axis of the liquid channel is approximately parallel to the horizontal plane. The plane containing the central axis is defined as the central axis plane, where the plane parallel to the horizontal plane is the central axis plane of the liquid channel parallel to the horizontal plane, and the plane perpendicular to the horizontal plane is the central axis plane of the liquid channel perpendicular to the horizontal plane. The connections of each bypass channel to the liquid channel and the gas-liquid mixing chamber are all located above the central axis plane of the liquid channel parallel to the horizontal plane, and all joints and inner surfaces of the pipes are smooth. "Smooth" means that the surface is free of protrusions, roughness, or other defects. Each bypass channel is preferably a straight channel with a constant diameter. This design prevents solid impurities entrained in the liquid stream from flowing into the bypass channels or depositing on the inner surface and near the joints under the influence of gravity. The bypass channels are symmetrically distributed along a central axis perpendicular to the horizontal plane. For example, when there are three bypass channels, one is located on the central axis perpendicular to the horizontal plane, and the other two are distributed on either side of it.

[0034] As described above, the gas-liquid mixing chamber preferably surrounds the liquid channel, with a central axial plane parallel to the horizontal plane as the boundary. Above this central axial plane, the gas-liquid mixing chamber communicates with the bypass channel. Below this central axial plane, preferably directly below the liquid channel, the gas-liquid mixing chamber is connected to a gas inlet and a gas-liquid mixing channel at opposite ends. The opening end of the gas inlet is located below the liquid inlet on the inlet end face, preferably directly below the liquid inlet. The gas-liquid mixing channel, extending within the body, is always located below the liquid channel, preferably directly below it. The gas-liquid mixing channel can be a channel with a constant diameter.

[0035] External liquid and gas supply pipes are inserted into the perforated liquid and gas inlets, respectively, and assembled together to deliver high-pressure liquid and gas from external liquid and gas sources into the gas-liquid injection device. Assembly can be performed using any method to form a sealed connection, including welding, flange connection, or adhesive bonding. When the body and one of the liquid or gas supply pipes are made of polymers, adhesive bonding is preferred. High pressure refers to the liquid and gas pressure being higher than atmospheric pressure. The liquid pressure at the liquid inlet is 0.2-3.0 barg (gauge pressure), and the gas pressure at the gas inlet is 1.5-15 barg (gauge pressure).

[0036] After the liquid flows into the converging section of the liquid channel through the supply pipe, approximately 2%-20% of the total liquid flow rate flows into the gas-liquid mixing chamber along the bypass channel, where it mixes with the gas flowing in through the gas supply pipe. The liquid flow rate is 10-100 m³ / h. 3The gas flow rate is 0.2-20 kg / h. To promote gas-liquid mixing, the gas supply pipe is generally in direct contact with the gas-liquid mixing chamber, and an orifice with a diameter of 0.5-2.5 mm is provided at the contact end of the gas supply pipe. When the gas enters the gas-liquid mixing chamber through this small orifice, it creates a flow obstruction, increasing the gas velocity to near or equal to the speed of sound. "Near" means within 20 m / s below the speed of sound, generally referred to as subsonic. The gas stream impacts the liquid in the mixing chamber, generating shear forces that break up large bubbles, resulting in a more uniform mixing of tiny bubbles and liquid. After mixing, the gas flows towards the outlet end along the gas-liquid mixing channel.

[0037] Figure 1 This is a cross-sectional view of the gas-liquid injection device in Embodiment 1, taken along the central axis plane perpendicular to the horizontal plane of the liquid channel. The body 01 has an inlet end face 07 and an outlet end face 08 that are parallel to each other. The liquid channel 02 penetrates the body 01 and consists of a liquid inlet 09 opening on the inlet end face 07, a tapering section 11, a throat section 12, and a channel outlet 10 opening on the outlet end face 08. The liquid supply pipe 14 extends into the liquid inlet 09 for a certain distance. When the liquid supply pipe 14 or the body 01, or both, are made of polymer, rubber, or other materials, they are bonded together with a suitable adhesive. Several circular holes are opened in the upper half of the tapering section 11 of the liquid channel 02, and the bypass channel 03 is smoothly connected through these holes. The other end of the bypass channel 03 is connected to the gas-liquid mixing chamber 05 surrounding the liquid channel. Therefore, the bypass channel 03 bypasses a portion of the liquid flowing in the liquid channel (02) to the gas-liquid mixing chamber 05. Gas inlet 04 opens onto inlet end face 07 and is located below liquid inlet 09. The portion of gas-liquid mixing chamber 05 located below liquid channel 02 is connected to gas inlet 04 and gas-liquid mixing channel 06 in opposite directions. In other words, gas-liquid mixing chamber 05 and gas-liquid mixing channel 06 are sequentially arranged downstream of gas inlet 04. Therefore, gas flowing in through gas inlet 04 enters gas-liquid mixing chamber 05 and mixes with liquid entering gas-liquid mixing chamber 05 via bypass channel 03, forming a gas-liquid mixed stream. This gas-liquid mixed stream then flows out through gas-liquid mixing channel 06, for example... Figure 1The gas flows from the gas-liquid mixing channel 06 to the throat section 12 of the liquid channel 02, and finally flows out to the external liquid environment. The gas inlet 04 opens on the inlet end face 07, preferably located below the liquid inlet 09, and has a depth extending into the body 01. The gas supply pipe 15 extends into the gas inlet 04. The gas inlet 04 can be configured to form a small hole with a diameter in the range of 0.5-2.5 mm at the position where it contacts the gas-liquid mixing chamber 05, through which the gas input by the gas supply pipe 15 is injected into the gas-liquid mixing chamber 05. Alternatively, the diameter of the gas inlet 04 remains unchanged at the position where it contacts the gas-liquid mixing chamber 05, and a small hole 16 with a diameter in the range of 0.5-2.5 mm is constructed on the end face of the gas supply pipe 15 that extends to the bottom of the gas inlet 04 and directly contacts the gas-liquid mixing chamber 05, to achieve the purpose of accelerating the gas flow. The gas-liquid mixing channel 06, located downstream of the gas-liquid mixing chamber 05, extends obliquely upward and connects to the liquid channel 02 at the throat section 12. The throat section 12 ensures that at the junction of the two, the pressure of the fluid in the liquid channel 02 (also known as the "unmixed stream") is less than the pressure of the fluid in the gas-liquid mixing channel 06 (also known as the "gas-liquid mixed stream"), and the flow velocities of the two streams are approximately equal. The outlet 13a of the gas-liquid mixing channel 06 on the liquid channel 02 can be elliptical; preferably, the minimum distance between the outlet 13a and the outlet end face 08 is no greater than 5-25 mm. The gas-liquid mixed stream flowing into the liquid channel 02 is distributed and flows along the lower surface of the liquid channel 02, without completely mixing with the unmixed stream from the liquid channel 02 on the inner side of the outlet end face 08. The "inner side" of the outlet end face refers to the side facing the injection device body 01, and the "outer side" refers to the side facing the liquid environment where the injection device is installed. When the unmixed stream and the gas-liquid mixed stream are injected into the liquid environment, the gas-liquid mixed stream is at least partially covered by the unmixed stream on the outer side of the outlet end face. As the gas bubbles mixed within it rise in the liquid environment, they must pass through the unmixed stream ejected from the channel outlet 10, thus being obstructed by it. This increases the residence time and path in the liquid environment, promoting gas-liquid mass transfer and effectively replenishing the gas consumed in the liquid environment. Simultaneously, the energy from the stream injection agitates the liquid environment, increasing liquid circulation and resulting in a faster and more uniform gas distribution. For reference, the length of the liquid inlet is approximately 50mm, and the inner diameter of the liquid inlet pipe is DN25-DN100; the length of the tapered section is 75-150mm, and the cone angle is 2-5 degrees; the length of the throat section is 50-100mm, and the inner diameter is 15-75mm; the diameter of the bypass channel is 10-25mm, the diameter of the gas-liquid mixing channel is 10-25mm; the length of the main body is 175-300mm, and the width of the main body is 50-200mm.

[0038] Figure 2This is a cross-sectional view of the gas-liquid injection device in Example 2, taken along the central axis plane perpendicular to the horizontal plane of the liquid channel. Figure 2 and Figure 1 The difference lies in the arrangement of the gas-liquid mixing channel 06 and the position of its outlet 13b. The gas-liquid mixing channel 06 is no longer connected to the liquid channel 02; the outlet 13b of the gas-liquid mixing channel 06 is directly located on the outlet end face 08, directly below the channel outlet 10 of the liquid channel 02. Preferably, the minimum distance between the outlet 13b of the gas-liquid mixing channel 06 and the channel outlet 10 is 5-25 mm. In operation, the gas-liquid mixed stream is completely covered by the unmixed stream on the outside of the outlet end face. When the gas mixed in the stream floats in the liquid environment, it must pass through the unmixed stream ejected from the channel outlet, thus being obstructed by it. This increases the residence time and path in the liquid environment, promoting gas-liquid mass transfer and effectively replenishing the gas consumed in the liquid environment. Simultaneously, the energy from the stream ejection agitates the liquid environment, making the gas distribution faster and more uniform. Taking wastewater treatment as an example, the jet stream generates and promotes effective contact between oxygen and water, providing oxygen while biological oxidation continuously consumes oxygen, maintaining a certain dissolved oxygen concentration in the water; in addition to supplying oxygen, it also generates sufficient stirring and mixing in the pool area, promoting water circulation and ensuring that activated sludge and wastewater are fully contacted and mixed; it maintains a certain movement speed of the mixed liquid, keeping the activated sludge in a suspended state in the mixed liquid.

[0039] Figure 3 Yes Figure 1 or Figure 2 This is a cross-sectional view of the gas-liquid injection device taken along the liquid channel in the AA direction. 01 represents the main body of the injection device, 11 is the tapering section of the liquid channel, and 03 represents three bypass channels connecting the liquid channel to the peripheral gas-liquid mixing chamber 05. The connections between the bypass channels and the liquid channel and the gas-liquid mixing chamber are all located on the central axis of the liquid channel, parallel to the horizontal plane, and the three bypass channels are symmetrically distributed relative to the central axis of the liquid channel, which is perpendicular to the horizontal plane. The central axes of the three bypass channels can all extend radially along the liquid channel. 06 represents the gas-liquid mixing channel, which is located directly below the liquid channel.

[0040] In general, in the above-mentioned gas-liquid injection device, the outlets 13a and 13b of the gas-liquid mixing channel are configured such that the gas bubbles formed by the gas injected through the gas-liquid mixing channel 06 pass through the liquid stream injected from the channel outlet 10 during the floating process on the outside of the outlet end face (08).

[0041] The liquid ejected by the gas-liquid jetting device includes water, liquid reactants, or other liquids with the same composition as the liquid environment, while the gas includes oxygen or other reactive gases. The materials constituting the gas-liquid jetting device are non-reactive, non-deformable, and safe relative to the ejected liquid and gas.

[0042] The gas-liquid jetting device can be assembled from various components, such as through welding, in which case the main body 01 is not necessary. More preferably, the gas-liquid jetting device can be integrally formed by 3D printing. Materials used for 3D printing include resins such as ABS (acrylonitrile-butadiene-styrene copolymer), PLA (polylactic acid), NYLON (polyamide fiber), and ASA (acrylonitrile-styrene-acrylic rubber terpolymer). Using 3D printing can significantly reduce manufacturing and installation costs, shorten manufacturing time, and make it easier to modify according to customer needs, thus enabling the gas-liquid jetting device of this invention to have wider applications.

[0043] Taking wastewater treatment as an example, Table 1 lists the oxygenation effect of using the gas-liquid injection device as described in Example 1 under three different operating conditions:

[0044] <![CDATA[Water flow rate (m 3 / h)]]> 50 50 50 Pump pressure (barg) 0.8 0.8 0.8 Generator power (kW) 2.2 2.2 2.2 Water depth (m) 5 5 2 Oxygen flow rate (kg / h) ～1.5 ～3 ～3 Oxygen pressure (barg) 2.3 2.3 2.3 SOTR (kg / h) 0.82 1.51 1.37 <![CDATA[SAE(kgO2 / kW)]]> 0.37 0.68 0.63

[0045] All three experiments were conducted in a wastewater tank, and the same parameters were used in all three: an initial water flow rate of 50 m³ / h from the supply pipe, a water pump pressure of 0.8 barg, a generator power of 2.2 kW, and an oxygen pressure of 2.3 barg. The different parameters included the depth at which the injection device was positioned in the water and the oxygen flow rate. The effectiveness of oxygenation was characterized using SOTR and SAE under standard conditions. Standard conditions refer to water at 20°C, 1 atmosphere, and zero oxygen content. Formulas and methods for converting actual measured values ​​to standard condition values ​​are well known to those skilled in the art.

[0046] SOTR (Standard Oxygen Delivery Rate, kg / h) refers to the amount of oxygen dissolved in water per hour (kg) under standard conditions; SAE (Standard Oxygen Efficiency, kgO2 / kW) refers to the amount of oxygen dissolved in water per kilowatt of energy consumption under standard conditions. The higher these two values, the better the oxygenation effect. When other parameters are the same, compared to 2 meters underwater (Experiment 3), the oxygen bubbles from the jet device at 5 meters underwater (Experiment 2) take longer to reach the water surface, resulting in more complete dissolution and higher SOTR and SAE values. However, because the device of this invention can fully and effectively disperse oxygen bubbles into the aqueous solution, the distance between the device and the liquid surface has a relatively small impact on the oxygenation effect, far less than the theoretical difference of 2.5 times. In contrast, when other parameters are kept constant, such as the injection device being installed at a depth of 5 meters underwater, and the oxygen flow rate is varied, the SOTR and SAE of Experiment 2 (3.0 kg / h) differ by nearly two times compared to Experiment 1 (1.5 kg / h). This indicates that within the flow rate range of the experiment, the injection device of the present invention can nearly completely disperse and dissolve the oxygen injected into the water.

[0047] Compared to existing technologies, which involve more complex structures and higher costs for gas-liquid injection devices, such as Ventoxal manufactured by Air Liquide, this technology offers a more robust and cost-effective alternative. TM In comparison, the device of the present invention has roughly the same oxygen injection effect.

[0048] The embodiments described herein are merely preferred embodiments of the present invention, and are used only to illustrate the technical solutions of the present invention and not to limit the present invention. Unless clearly indicated otherwise, each aspect or embodiment defined herein may be combined with any other one or more aspects or embodiments. In particular, any indicated preferred or advantageous feature may be combined with any other indicated preferred or advantageous feature. All technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation should be within the scope of the present invention.

Claims

1. A gas-liquid injection device for injecting at least one gas and at least one liquid into a liquid environment, characterized in that: It includes a main body (01), and the main body (01) is provided with a liquid channel (02), a bypass channel (03), a gas inlet (04), a gas-liquid mixing chamber (05), and a gas-liquid mixing channel (06), wherein: The body (01) includes an inlet end face (07) and an outlet end face (08) facing each other. The liquid channel (02) includes a liquid inlet (09) opening onto the inlet end face (07) and a channel outlet (10) disposed on the outlet end face (08), and includes a tapering section (11) and a throat section (12) sequentially disposed downstream of the liquid inlet (09). One end of the bypass channel (03) opens onto the tapering section (11), and the other end is connected to the gas-liquid mixing chamber (05). The bypass channel (03) bypasses the liquid flowing in the liquid channel (02) to the gas-liquid mixing chamber (05). The cavity (05) is located around the liquid channel (02); the gas inlet (04) opens on the inlet end face (07) and is located below the liquid inlet (09). The gas-liquid mixing cavity (05) and the gas-liquid mixing channel (06) are arranged sequentially downstream of the gas inlet (04). The gas flowing in through the gas inlet (04) enters the gas-liquid mixing cavity (05) and mixes with the liquid in the gas-liquid mixing cavity (05) to form a gas-liquid mixed stream. The gas-liquid mixed stream flows out through the gas-liquid mixing channel (06); the gas-liquid mixing channel (06) is located below the liquid channel (02).

2. The gas-liquid injection device as described in claim 1, characterized in that: The connection points between the bypass channel (03), the tapering section (11), and the gas-liquid mixing chamber (05) are all located on the central axis of the liquid channel (02) parallel to the horizontal plane.

3. The gas-liquid injection device as described in claim 2, characterized in that: The number of bypass channels (03) is greater than or equal to one, and they are symmetrically distributed with respect to the central axis of the liquid channel (02) perpendicular to the horizontal plane.

4. The gas-liquid injection device as described in claim 3, characterized in that: The bypass channel (03) is smoothly connected to the tapered section (11).

5. The gas-liquid injection device as described in claim 2, characterized in that: The flow rate of liquid entering the gas-liquid mixing chamber (05) via the bypass channel (03) is 2%-20% of the total flow rate of liquid entering the gas-liquid injection device.

6. The gas-liquid injection device as described in claim 1, characterized in that: It also includes an external liquid source and a liquid supply pipe (14) connected to the external liquid source, the liquid supply pipe (14) being installed at the liquid inlet (09) of the liquid channel (02).

7. The gas-liquid injection device as described in claim 6, characterized in that: The flow rate of the liquid is no greater than 5 m / s at the liquid inlet (09) and between 5 m / s and 25 m / s at the channel outlet (10).

8. The gas-liquid injection device as described in claim 7, characterized in that: The flow rate of the liquid is 10-100 m³ / h. 3 / h, the pressure of the liquid at the liquid inlet (09) is 0.2-3.0 Barg.

9. The gas-liquid injection device as described in claim 1, characterized in that: It also includes an external gas source and a gas supply pipe (15) connected to the external gas source, the gas supply pipe (15) being installed at the gas inlet (04).

10. The gas-liquid injection device as described in claim 9, characterized in that: The gas pressure in the gas supply pipeline (15) is 1.5-15 Barg, and the gas flow rate is 0.2-20 kg / h.

11. The gas-liquid injection device as described in claim 10, characterized in that: Gas flows into the gas-liquid mixing chamber (05) through an orifice (16) with a diameter between 0.5 and 2.5 mm, and the gas enters the gas-liquid mixing chamber (05) at a subsonic or sonic speed.

12. The gas-liquid injection device as described in claim 11, characterized in that: The orifice (16) is located at the end of the gas supply pipe (15) that is in contact with the gas-liquid mixing chamber (05).

13. The gas-liquid injection device as described in claim 1, characterized in that: The ratio of liquid to gas in the jet is 1.0-30m. 3 The liquid corresponds to 1 kg of gas.

14. The gas-liquid injection device as described in claim 1, characterized in that: The outlet of the gas-liquid mixing channel (06) is located in the throat section (12) of the liquid channel (02).

15. The gas-liquid injection device as described in claim 14, characterized in that: The shortest distance between the outlet of the gas-liquid mixing channel (06) and the outlet end face (08) is 5-25 mm.

16. The gas-liquid injection device as described in claim 1, characterized in that: The outlet of the gas-liquid mixing channel (06) is located on the outlet end face (08) of the main body (01).

17. The gas-liquid injection device as described in claim 16, characterized in that: The shortest distance between the outlet of the gas-liquid mixing channel (06) and the outlet of the channel (10) on the outlet end face (08) is 5-25 mm.

18. The gas-liquid injection device as described in claim 1, characterized in that: The liquid contains water, and the gas contains oxygen.

19. A preparation method for preparing a gas-liquid injection device as described in any one of claims 1 to 18, characterized in that: The gas-liquid jetting device was manufactured using 3D printing.

20. The preparation method according to claim 19, characterized in that: Materials used for 3D printing include ABS, PLA, NYLON, and ASA.

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