Multi-functional pulse aerator

Abstract

The application provides a multifunctional pulse aerator, and belongs to the technical field of water treatment equipment.The lower slot distributor is completely open at the bottom, and the distribution aperture and hole speed are regulated and designed, so that the distributor has an anti-inclination effect and completely avoids the risk of blockage.The length and width of the middle pulse aeration chamber and other parameters can be flexibly regulated according to the application scene through design calculation, so as to meet different aeration amounts and pulse cycle requirements.The aeration cup in the middle pulse aeration chamber can realize jet pulse and large-bubble pulse aeration and other forms through parameter and structure design changes.The upper gas distributor can realize gas redistribution and prevent the settlement of solid objects from entering the pulse aeration chamber and causing blockage.The multifunctional pulse aerator has different application scenes and environmental applications.

Description

Technical Field

[0001] This invention relates to the field of water treatment equipment technology, specifically to a multifunctional pulse aerator capable of realizing various aeration modes such as medium / small bubble flow aeration, jet pulse aeration, and large bubble pulse aeration. Background Technology

[0002] Based on bubble size, common aeration methods include microbubble aeration, medium / small bubble aeration, and large bubble aeration. Commonly used resistance-type aerators include microporous aerators, perforated aerators, and pulse aerators. Different bubble characteristic parameters result in different flow regimes in different application scenarios and environments, such as bubble flow, slug flow, and annular flow. The different flow regimes caused by aeration have different effects and gas-liquid two-phase characteristic parameters in different application scenarios. For example, gas stirring essentially uses gas to drive liquid mixing. In the MBR process of wastewater treatment, the core of aeration is gas scrubbing and gas-liquid two-phase circulation / mass transfer; therefore, the required aeration parameters will inevitably differ depending on the device structure and membrane parameters.

[0003] Currently, two common aeration methods are used in MBR membrane systems: perforated aeration (medium / small bubble aeration) and pulse aeration (large bubble aeration). When the MBR unit is running, the bubbles, under the influence of force, drive the liquid upwards, creating a gas-liquid flow. Perforated aeration typically forms a bubble flow, characterized by numerous, relatively uniform bubbles, and a rapid upward flow velocity of the gas-liquid mixture, thus scouring the surface of the hollow fiber or flat sheet membrane and removing sludge adsorbed on the membrane fibers. To achieve higher flux, higher aeration intensity is required to generate a stronger scouring force to maintain membrane surface cleanliness, which leads to increased aeration energy consumption. Pulse aeration, on the other hand, evolved from manually controlled valves that switch between high and low aeration levels, and is an automatically switching pulse aeration method. Summary of the Invention

[0004] The purpose of this invention is to provide a multifunctional pulse aerator to achieve aeration functions of different sizes and flow patterns.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a multifunctional pulse aerator, comprising: a lower trough-type distributor for redistributing gas in an equipment system using the multifunctional pulse aerator; a middle section consisting of a pulse aeration chamber, an outer aeration cup, and an inner aeration cup, which together form a pulse aeration pattern of gas accumulation and instantaneous release; and an upper gas distributor for redistributing the pulsed gas and preventing the outer and inner aeration cups from being blocked by solid sediments. The trough-type distributor adopts a completely open lower section, completely avoiding the risk of overall blockage of the distributor. It utilizes the principle of height difference between the gas-water interface and the orifice formed by the flow resistance of the small holes, providing anti-tilting effect within a certain range.

[0007] Furthermore, the pulse aeration chamber, the outer aeration cup, and the inner aeration cup work together to achieve pulse aeration, which involves the accumulation and instantaneous release of gas. Gas accumulates in the pulse aeration chamber, and as the gas accumulates, the gas-liquid interface continuously descends until it reaches the critical point. The position of the critical point is determined by the lower edge of the inner aeration cup. Before the gas accumulated in the pulse aeration chamber is released, the inner aeration cup is filled with liquid and is associated with the static pressure of the entire equipment system. The gas-liquid interface in the outer aeration cup is flush with the gas-liquid interface in the pulse aeration chamber.

[0008] Furthermore, as the gas accumulates, the gas-liquid interface moves downward until it reaches the lower edge of the aeration cup, reaching a critical point. When the gas-liquid interface moves downward slightly with the accumulation of gas and liquid, an unstable state is formed in the aeration cup. That is, driven by the static liquid level difference in the aeration cup, the gas begins to accelerate like a bullet and is released instantaneously, thus completing one pulse aeration process.

[0009] Furthermore, the central position inside the gas distributor is the central gas distribution point, and multiple gas ports are evenly arranged on the gas distributor. Multiple gas channels are set to connect the gas ports and the central gas distribution point respectively.

[0010] The beneficial effects of this invention are as follows: The bottom of the lower trough-type distributor is completely open, and the distribution orifice diameter and velocity are adjustable, giving the distributor anti-tilting properties and completely avoiding the risk of clogging. The length, width, and other parameters of the middle pulse aeration chamber can be flexibly adjusted according to the application scenario through design calculations to meet different aeration volume and pulse cycle requirements. The aeration cups in the middle pulse aeration chamber can achieve jet pulse and large bubble pulse aeration forms through parameter and structural design changes. The upper gas distributor can both redistribute gas and prevent settled solids from entering the pulse aeration chamber and causing clogging. This multifunctional pulse aerator is suitable for various application scenarios and environments.

[0011] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a three-dimensional structural diagram of the multifunctional pulse aerator described in an embodiment of the present invention.

[0014] Figure 2 This is a structural diagram of the internal structure of the multifunctional pulse aerator described in an embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram of the slot-type distributor structure according to an embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram illustrating the working principle of the pulse aeration chamber, the outer aeration cup, and the inner aeration cup as described in an embodiment of the present invention.

[0017] Figure 5 This is a schematic diagram illustrating the design principle of key influencing parameters of the multifunctional pulser according to an embodiment of the present invention.

[0018] Figure 6 This is a schematic diagram of the aeration cup design for different pulse aeration modes according to an embodiment of the present invention.

[0019] Figure 7 This is a structural diagram of a gas distributor according to an embodiment of the present invention. Wherein, Figure 7 (a) is a three-dimensional structural diagram. Figure 7 (b) is a diagram of the internal structure. Figure 7 (c) is the main view structure diagram.

[0020] Figure 8 This is a schematic diagram showing the relationship between the gas-water interface and the center distance of the distribution orifice under different gas velocities in an embodiment of the present invention.

[0021] The components include: 1. trough distributor; 2. pulse aeration chamber; 3. outer aeration cup; 4. inner aeration cup; and 5. gas distributor. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as here.

[0025] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or groups thereof.

[0026] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0027] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In the description of this specification, the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this technology and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this technology.

[0029] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of these terms in this art according to the specific circumstances.

[0030] To facilitate understanding of the present invention, the present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. However, the specific embodiments do not constitute a limitation on the embodiments of the present invention.

[0031] Those skilled in the art should understand that the accompanying drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily essential for implementing the present invention.

[0032] Example 1

[0033] like Figures 1 to 7 As shown in Embodiment 1, a multifunctional pulse aerator and its design method are provided, comprising: a lower trough-type distributor 1 for redistributing gas in an equipment system using the multifunctional pulse aerator; a middle pulse aeration chamber 2, an outer aeration cup 3, and an inner aeration cup 4, which together form a pulse aeration pattern of gas accumulation and instantaneous release; and an upper gas distributor 5 for redistributing the pulse gas and preventing the outer aeration cup 3 and the inner aeration cup 4 from being blocked by solid sediment. The lower trough-type distributor 1 of this multifunctional pulse aerator can be used alone; the pulse aeration chamber 2, the outer aeration cup 3, and the inner aeration cup 4 form the middle part of the multifunctional pulse aerator and can be combined with the trough-type distributor 1 for use alone.

[0034] In this embodiment, the lower part of the pulse aerator consists of a trough-type distributor 1. The trough-type distributor 1 adopts a completely open lower part, completely avoiding the risk of overall blockage of the distributor; it utilizes the principle of creating a height difference between the air-water interface and the orifice by utilizing the flow resistance of the small holes, thus providing anti-tilting effect within a certain range. In certain application scenarios, the trough-type distributor 1 can be directly used as an aerator for gas distribution.

[0035] The multifunctional pulse aerator consists of a pulse aeration chamber 2, an outer aeration cup 3, and an inner aeration cup 4 in its central part. The pulse aeration chamber 2, the outer aeration cup 3, and the inner aeration cup 4 work together to achieve pulse aeration, which involves gas accumulation and instantaneous release. First, gas accumulates in the pulse aeration chamber. As the gas accumulates, the gas-liquid interface continuously descends until it reaches the critical point. The critical point is determined by the lower edge of the inner aeration cup 4. Before a certain volume of gas accumulated in the pulse aeration chamber is released, the inner aeration cup 4 is filled with liquid and is associated with the static pressure of the entire equipment system. The gas-liquid interface in the outer aeration cup 3 is flush with the gas-liquid interface in the pulse aeration chamber 2. As the gas accumulates, the gas-liquid interface continuously moves downward until it reaches the lower edge of the inner aeration cup 4, reaching the critical point. When the gas-liquid interface moves slightly downward again with the accumulation of gas and liquid, an unstable state is formed in the inner aeration cup 4. That is, driven by the static liquid level difference, the gas in the inner aeration cup 4 begins to accelerate like a bullet and is released instantaneously, thus completing one pulse aeration process.

[0036] In this embodiment, the upper part of the multifunctional pulse aerator consists of a gas distributor 5. The gas distributor 5 adopts a one-to-n (2 < n ≤ 8) configuration, which can distribute gas evenly or non-uniformly depending on the application scenario. The distributor adopts a streamlined design to reduce flow resistance and boundary layer separation.

[0037] The structural parameters (length and width) of the pulse aeration chamber 2 can be designed according to the application scenario. The single pulse aeration volume and pulse aeration cycle are determined by the core parameters of the pulse aeration chamber 2 and the inner aeration cup 4, and can be theoretically calculated. Simultaneously, by controlling the structural parameters of the inner aeration cup 4 to increase or decrease the instantaneous pulse velocity, the form of single pulse aeration can be directly affected, thus influencing the gas-liquid mixed flow pattern. For example, reducing the pipe diameter parameter of the inner aeration cup 4 or designing a narrow orifice will increase the velocity of the gas flowing through the internal pipe diameter of the aeration chamber, thus forming a pulse aeration pattern of multi-bubble rapid jet flow similar to a smoke ring. Conversely, increasing the pipe diameter parameter of the inner aeration cup 4 will decrease the velocity of the gas flowing through the internal pipe diameter of the aeration chamber, resulting in a pulse aeration pattern of instantaneously surging large bubbles.

[0038] Example 2

[0039] like Figures 1 to 7 As shown, this embodiment proposes a multifunctional pulse aerator and its design method. By analyzing the upper, middle and lower core parts of the multifunctional pulse aerator, the structural design differences and design methods of pulse aerators with different functions are proposed, thereby realizing the multifunctional design of pulse aerators, such as medium / small bubble flow aeration, jet pulse aeration and large bubble pulse aeration, etc.

[0040] In this embodiment, the multifunctional pulse aerator includes: a lower trough-type distributor 1, used to redistribute gas in the equipment system using the multifunctional pulse aerator; a middle pulse aeration chamber 2, an outer aeration cup 3, and an inner aeration cup 4, which together form a pulse aeration mode of gas accumulation and instantaneous release; and an upper gas distributor 5, which redistributes the pulse gas and also prevents the outer aeration cup 3 and the inner aeration cup 4 from being blocked by solid sediments. The lower trough-type distributor 1 of this multifunctional pulse aerator can be used alone; the pulse aeration chamber 2, the outer aeration cup 3, and the inner aeration cup 4, which form the middle part of the multifunctional pulse aerator, can be used in combination with the trough-type distributor 1.

[0041] In this embodiment, the lower core component, the slotted distributor 1, adopts a completely open lower design, completely avoiding the risk of overall blockage of the distributor. Utilizing the principle of height difference between the gas-water interface and the slotted distributor hole, formed by the flow resistance of the distribution hole, it provides anti-tilting protection within a certain range. The slotted distributor 1 has a distribution hole diameter d = 3–7 mm, and controlling the gas flow rate within the range of 7.5–20 m / s can provide a certain degree of anti-tilting protection.

[0042] In this embodiment, as Figure 3 As shown, the slot-type distributor is specifically designed as follows: L = δ × 0.05μ 2 Where L is the distance between the gas-water interface and the center of the distribution hole, in mm; δ is the design coefficient, ranging from 0.8 to 1.2; and μ is the gas velocity in the distribution hole, in m / s.

[0043] If the application scenario requires a bubble flow pattern and the bubble size is within a certain range (5-20mm), the trough distributor 1 can be directly used as an aerator for gas distribution and aeration.

[0044] like Figure 4 As shown, the central core component consists of a pulse aeration chamber 2, an outer aeration cup 3, and an inner aeration cup 4. The pulse aeration chamber 2, outer aeration cup 3, and inner aeration cup 4 work together to achieve pulse aeration, which involves the accumulation and instantaneous release of gas. First, gas accumulates in the pulse aeration chamber. As the gas accumulates, the gas-liquid interface continuously descends until it reaches the critical point. The critical point is determined by the lower edge of the inner aeration cup 4. Before a certain volume of gas accumulated in the pulse aeration chamber is released, the inner aeration cup 4 is filled with liquid and is associated with the static pressure of the entire equipment system. The gas-liquid interface in the outer aeration cup 3 is flush with the gas-liquid interface in the pulse aeration chamber 2. When the gas-liquid interface continues to descend as the gas accumulates until it reaches the lower edge of the inner aeration cup 4, the critical point is reached. When the gas-liquid interface descends slightly further with the accumulation of gas and liquid, an unstable state is formed in the inner aeration cup 4. That is, driven by the static liquid level difference, the gas in the inner aeration cup 4 accelerates and is released in a short time, thus completing one pulse aeration process.

[0045] The structural parameters (length and width) of the pulse aeration chamber 2 can be designed according to the application scenario; the single pulse aeration volume and pulse aeration cycle are determined by the core parameters of the pulse aeration chamber 2, the outer aeration cup 3, and the inner aeration cup 4, and can be theoretically calculated.

[0046] like Figure 5 As shown, the key parameters of the pulse aeration chamber, outer aeration cup, and inner aeration cup are: single pulse aeration volume V 单脉冲 ≈s×Δh, where s is the effective cross-sectional area and Δh is the difference in key parameters between the outer aeration cup and the inner aeration cup.

[0047] Where qin is the intake rate, P0 is the local atmospheric pressure, and ρ 水 Let ρ be the density of water, and h be the key height parameter of the liquid surface from the bottom of the aeration cup.

[0048] Simultaneously, by controlling the structural parameters of the inner aeration cup 4 to increase or decrease the flow resistance, and thus control the gas outflow velocity of the inner aeration cup 4, the form of single-pulse aeration can be directly affected, thereby influencing the gas-liquid mixed flow pattern. For example, reducing the pipe diameter parameter of the inner aeration cup 4 or designing a narrow orifice to increase the flow resistance will result in a decrease in the velocity of the gas flowing through the inner pipe diameter of the aeration cup, forming a pulse aeration pattern of multiple bubbles rapidly jetting, similar to exhaling smoke rings. Conversely, increasing the pipe diameter parameter of the inner aeration cup 4 to decrease the flow resistance will result in a faster velocity of the gas flowing through the inner pipe diameter of the aeration cup, forming a pulse aeration pattern of instantaneously surging large bubbles.

[0049] like Figure 6 As shown, the design parameters for jet pulse aeration and large bubble pulse aeration are: jet pulse aeration controls the air velocity in the aeration cup to be ≥25m / s; large bubble pulse aeration controls the air velocity in the aeration cup to be ≤15m / s.

[0050] like Figure 7 As shown, the upper core component, the gas distributor 5, adopts a one-to-n (2 < n ≤ 8) configuration, which can distribute gas evenly or non-uniformly depending on the application scenario. Specifically, the central position within the gas distributor is the central gas distribution point, and multiple gas ports are evenly arranged on the gas distributor, with the number of ports n being 2 < n ≤ 8. Multiple gas channels connect the gas ports to the central gas distribution point. The gas channels within the distributor employ a streamlined design to reduce flow resistance and boundary layer separation.

[0051] Specifically, such as Figure 7As shown, the gas distributor 5 in this embodiment has six gas channels, all of which connect to a central gas distribution point, forming a 1:6 gas distribution pattern. The main purpose of the gas distributor 5 is to evenly distribute the gas, ensuring that the gas flow covers the designed area. The gas distributor 5 includes a rectangular shell with six air inlets on two opposite faces, three on each face, symmetrically and evenly distributed. The central gas distribution point is located inside the shell and has 12 arc-shaped channel walls. Each air inlet connects to the central gas distribution point through two arc-shaped channel walls, forming a gas channel between them. The gas distributor 5 is fixed to the pulse aeration chamber 2 via fixing holes on the shell. During use, a burst of gas instantaneously flows from the aeration cup 4 directly onto the central gas distribution point. Using a 1:6 distribution pattern, this burst of gas is directly divided into six parts. If the flow channel uses an even distribution pattern, the gas in each arc-shaped channel is equally divided.

[0052] In another specific embodiment, such as Figure 2 As shown, the multifunctional pulse aerator can be equipped with n (n≥1) individual pulse aerator compartments. Each pulse aerator compartment is equipped with an outer aeration cup, an inner aeration cup, and an upper gas distributor. The bottom trough distributor can also use other forms of gas distribution for air intake.

[0053] Based on its design principles and methods, the slotted distributor has the following relationship: when the design coefficient δ = 1, the distance between the air-water interface and the center of the distribution hole at different distribution hole velocities is as follows: Figure 8 As shown.

[0054] Based on the specific design method of key parameters of the pulse aeration chamber, outer aeration cup, and inner aeration cup, the aeration chamber is set to be 200mm long and 150mm wide, the inner aeration cup to be 30mm in diameter, and the wall thickness of all materials to be 3mm. The height difference between the outer and inner aeration cups is Δh = 140mm, the liquid level distance from the bottom of the inner aeration cup is h = 3m, and the air intake rate is 60L / min.

[0055] The calculated aeration volume for a single pulse is 4 L. The pulse period is 5.66 s.

[0056] In summary, the multifunctional pulse aerator and its design method described in this embodiment of the invention comprise three core parts: (1) Lower part—trough distributor: First, the gas is evenly distributed through the lower trough distributor, and it has an anti-tilting effect within a certain range. (2) Middle part—pulse aeration chamber, outer aeration cup, and inner aeration cup: The bubbles overflowing from the trough distributor converge in the middle part of the pulse aerator—pulse aeration chamber. The inner and outer aeration cups together form a U-shaped interconnected structure. As the gas continuously accumulates in the pulse aeration chamber, it eventually reaches the critical point of the aeration cup, and then overflows from the upper opening of the aeration cup in different bubble forms in a very short time. (3) Upper part—gas distributor: The gas overflowing from the pulse aeration chamber is redistributed through the upper gas distributor. At the same time, the upper gas distributor can also prevent solid sediment from falling into the aeration cup and causing blockage.

[0057] The multifunctional pulse aerator of this invention features a fully open bottom trough-type distributor with adjustable orifice diameter and velocity, ensuring anti-tilting properties and completely eliminating the risk of clogging. The length, width, and other parameters of the middle pulse aeration chamber can be flexibly adjusted according to application scenarios through design calculations to meet different aeration volume and pulse cycle requirements. The aeration cups in the middle pulse aeration chamber can achieve jet pulse and large bubble pulse aeration through parameter and structural design variations. The upper gas distributor not only redistributes gas but also prevents settled solids from entering the pulse aeration chamber and causing clogging. This multifunctional pulse aerator is suitable for various application scenarios and environments.

[0058] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that, based on the technical solutions disclosed in the present invention, various modifications or variations that can be made by those skilled in the art without creative effort should be included within the scope of protection of the present invention.

Claims

1. A multifunctional pulse aerator, characterized in that, include: The lower part is a trough-type distributor (1), which is used to redistribute gas to the equipment system using the multi-functional pulse aerator; The middle part consists of a pulse aeration chamber (2), an outer aeration cup (3), and an inner aeration cup (4), which together form a pulse aeration pattern of gas accumulation and instantaneous release; the upper part is a gas distributor (5), which redistributes the pulse gas and also prevents the outer aeration cup (3) and the inner aeration cup (4) from being blocked by solid sediments; the trough distributor (1) adopts a completely open lower part, which completely avoids the risk of overall blockage of the distributor. It utilizes the principle of the height difference between the gas-water interface and the small hole formed by the flow resistance of the small hole, which has an anti-tilting effect within a certain range; the pulse aeration chamber (2), the outer aeration cup (3), and the inner aeration cup together complete the pulse aeration pattern of gas accumulation and instantaneous release; the gas accumulates in the pulse aeration chamber. As the gas accumulates, the gas-liquid interface continues to descend until the critical point is reached. The critical point is determined by the lower edge of the inner aeration cup (4). Before the gas is released from the pulse aeration chamber, the inner aeration cup (4) is filled with liquid and is associated with the static pressure of the overall equipment system. The gas-liquid interface in the outer aeration cup 4 is flush with the gas-liquid interface in the pulse aeration chamber (2). As the gas accumulates, the gas-liquid interface continues to descend until the lower edge of the inner aeration cup (4) reaches the critical point. When the gas-liquid interface descends slightly with the accumulation of gas and liquid, an unstable state is formed in the inner aeration cup (4). That is, due to the static liquid level difference, the gas in the inner aeration cup (4) begins to accelerate like a bullet and is released instantaneously, thus completing one pulse aeration process. The central gas distribution point is located in the middle of the gas distributor (5). Multiple gas ports are evenly arranged on the gas distributor (5), and multiple gas channels are set to connect the gas ports and the central gas distribution point respectively. The slotted distributor (1) is specifically designed as follows: ,in L This is the distance between the air-water interface and the center of the distribution hole, in mm; Design factor, range: 0.8 to 1.2; The gas velocity at the distribution orifice is expressed in m / s. The key parameters of the pulse aeration chamber (2), the outer aeration cup (3), and the inner aeration cup (4) are: single pulse aeration volume. Where s is the effective cross-sectional area, The key parameter difference between the outer aeration cup (3) and the inner aeration cup (4); The pulse aeration is made into a jet pulse aeration form by reducing the diameter of the aeration inner cup (4), or the pulse aeration is made into a large bubble pulse aeration form by increasing the diameter of the aeration inner cup (4). The pulse period of the pulse aeration ;in qin For intake air rate, P 0 The local atmospheric pressure. Let ρ be the density of water, and h be the key height parameter of the liquid surface from the bottom of the aeration cup.

Images