An aeration device for oil-containing sewage

Abstract

The application discloses an oil-containing sewage aeration device, relates to the technical field of oil-containing sewage treatment equipment, and specifically relates to an oil-containing sewage aeration device which is installed at the end of a fluid medium discharge pipeline and comprises a pulsating flow generator, an outer sleeve, a tail pipe and a bellows. The fluid medium flows in a main flow channel, the fluid medium in the main flow channel flows at a high speed, the medium outside the outer sleeve is affected by pressure and enters the main flow channel through an inflow hole, the inflow hole of the outer sleeve and a liquid flow nozzle form a shearing gap, the medium flows in the shearing gap, that is, there is a velocity gradient on the cross section of the medium, the medium is affected by a transverse shearing force, the medium forms a pressure shearing flow when passing through the shearing gap, and the oil-water interface film strength is weakened after the shearing effect, which creates conditions for the coalescence of liquid drops. Therefore, the high-frequency vibration shearing is beneficial to the separation of oil and water in the oil-water emulsion, beneficial to the dehydration of crude oil during oil-water separation, and greatly enhances the oil-water separation effect.

Description

Technical Field

[0001] This invention relates to the technical field of oily wastewater treatment equipment, specifically to an oily wastewater aeration device. Background Technology

[0002] The sludge bioleaching deep dewatering process mainly treats biochemical sludge concentrated in a thickening tank. This sludge is characterized by high concentration (moisture content 95.0-98.5%), anaerobic odor, and other features. However, bioleaching requires aerobic aeration, high fluidization of the sludge-water mixture, and an acidic system pH. Conventional aeration and mixing methods are not suitable for bioleached sludge. Therefore, it is necessary to develop an aeration device that provides both oxygen supply and mixing for bioleached sludge. Oily sludge generated by the petroleum and petrochemical industry is also characterized by high viscosity and high oil content. Biological treatment processes for oily sludge are only suitable for sludge with an oil content below 5%, and are difficult to effectively treat sludge with higher oil content, with long treatment times. The treatment of oily wastewater and sludge has become a major problem for the petroleum and petrochemical industry. Therefore, there is an urgent need to develop an economical, environmentally friendly, harmless, and efficient method for treating high-oil-content wastewater and sludge.

[0003] There is a Chinese utility model patent, titled "An Aeration Device for Sludge Bioleaching," publication number CN209507726U. The device depicted in this patent includes a vertically arranged and axially continuous cylinder, an air inlet pipe connected to the lower inner side of the cylinder for inputting external airflow, a rotary flow generator installed in the middle of the inner side of the cylinder for preliminary gas-liquid mixing, and a shear chamber located in the upper inner side of the cylinder for thorough gas-liquid mixing. The rotary flow generator includes a fixed rod coaxially arranged with the cylinder and several blades spirally arranged along the axis of the fixed rod on the outer wall of the fixed rod and the inner wall of the cylinder. The shear chamber consists of several conical shear cones fixed to the inner wall of the cylinder. While this existing technology can achieve a strong flow generation (rotating flow) effect and has a good mixing effect, ensuring thorough mixing of air and wastewater, improving water-air mixing conditions, preventing sludge deposition at the bottom of the tank, and enhancing the sludge biological leaching effect, this rotating airflow has poor pulsation performance and lacks the unique characteristics of pulsating flow. The jet boundary area suffers from poor propulsion performance, a small service area, low oxygen conversion efficiency, and low dissolved oxygen efficiency, meaning its oxygenation capacity is not ideal. More importantly, the sludge and sand in the sludge, under the entrainment of the high-speed airflow, will cause significant wear on the conical shear cone of the shear chamber fixed at the top of the cylinder. The pointed tip of the shear cone will quickly become blunt and may even be bent by the high-speed impact of sand and gravel particles, resulting in a short service life. In other words, the shear cone has a critical problem of sludge and sand abrasion at key parts. Therefore, the erosion resistance of the internal components of this type of aeration device is a critical issue that must be addressed. Moreover, the shear cone of this patent has a complex manufacturing process and high production cost. The shear cone is fixedly installed, and as a vulnerable component, its disassembly and maintenance are very inconvenient. Furthermore, this patented device controls the entire operation solely by adjusting the pressure, flow rate, and velocity of the intake pipe. This creates negative pressure at the bottom of the device, drawing in sludge. The air-water mixing ratio, shearing force, and the resulting circulating flow pattern are difficult to adjust, leading to dead zones or short-circuiting phenomena.

[0004] There is a Chinese patent for invention, titled "Jet Aeration Reactor," publication number CN1233573C. This patent relates to a jet aeration reactor for industrial wastewater or municipal sewage treatment. It includes a nozzle, an upper nozzle body, a self-excited oscillating mixing chamber, a lower nozzle body, and a short pipe, all sequentially installed on the same centerline. An air intake pipe is mounted on the upper nozzle body and communicates with the air intake chamber within the upper nozzle body. The nozzle has a through-hole, the air intake chamber within the upper nozzle body, the self-excited oscillating mixing chamber within the self-excited oscillating mixing chamber, the lower nozzle body, and the short pipe are all connected. This invention enables thorough mixing of water and air within the self-excited oscillating mixing chamber, transforming the continuous water-air two-phase flow into a pulsed water-air two-phase flow. The outflow pressure amplitude is 15-30% higher than the inflow pressure, significantly improving water-air mixing conditions, increasing oxygen conversion efficiency, enhancing turbulence in aerobic water bodies, improving convection and diffusion capabilities, increasing the service area of ​​the aeration reactor, and enhancing water-air separation. However, in this patent, the size of the important self-excited oscillation chamber is fixed and does not have a flexible adjustment function. When the on-site process parameters change and exceed its reasonable operating matching parameters, the entire process parameters need to be reconfigured. The shape and size of the chamber cannot be changed accordingly, which leads to a significant reduction in the pulse effect, making it inconvenient to use.

[0005] There is a publicly available Chinese utility model patent, titled "A Pulse Jet Aerator," publication number CN200949072Y. This prior art pulse jet aerator has a coaxially mounted inlet pipe, air intake chamber, oscillation chamber, and tailpipe structure. The air intake pipe is installed above the air intake chamber, and the oscillation chamber is a multi-stage oscillation chamber. Due to the multi-stage oscillation chamber, air and water are mixed more thoroughly through multiple stages of oscillation, allowing more oxygen from the air to dissolve into the water, thus enhancing the aeration effect. However, this patent also suffers from a significant drawback: the self-excited oscillation chamber has a fixed size and lacks flexible adjustment. That is, the oscillation chamber length of this type of oscillator is a fixed value; when the working pressure or the diameter of the upper and lower outlet nozzles changes, the oscillation chamber length cannot be adjusted accordingly, resulting in a significant reduction in the pulse effect.

[0006] There is a Chinese invention patent, titled "Method and Apparatus for Treating Domestic Sewage Using Vertical Flow," publication number CN107176768B. This prior art discloses a method and apparatus for treating domestic sewage using vertical flow. A pulsator guide device is installed at the bottom of anoxic reaction tank. Under the impact of the influent flow, the pulsator guide device rotates, driving the sewage and packing material to mix, forming a rotating and vertically upward flow. The anoxic suspended biological packing material with attached biofilm circulates with the water flow. There are no dead zones in the anoxic reaction tank, the flow field distribution is relatively ideal, the tank volume utilization rate is high, and the reaction tank does not require a stirrer, resulting in no energy consumption and a long packing material lifespan. Through a special water guide pipe structure, the water flow in the aerobic reaction tank forms a horizontal rotating flow and a vertical upward (or downward) flow. The aerobic suspended biological packing material with attached biofilm circulates with the water flow, there are no dead zones in the aerobic reaction tank, forming a relatively ideal flow field distribution and creating a vertical mixed flow. This completely avoids sludge accumulation at the bottom of the reactor, greatly improving reaction efficiency and reactor volume utilization rate. However, the patented device has a complex structural design and assembly process, requires a large investment, and is difficult and costly to operate and maintain.

[0007] There is a Chinese utility model patent, titled "Jet Distributor," publication number CN2741975Y. This prior art jet distributor includes a throat, with a flared expansion tube connected to the front end and a flared negative pressure tube connected to the rear end. A raw water jetting pipe is inserted into the negative pressure tube and connected to a raw water pipe. The characteristics and effects of this patented device are: it is not prone to clogging, the raw water and activated sludge come into efficient contact, mixing is uniform, the pressure difference creates a flowing state in the sludge layer, reducing dead zones, and the structure is simple and easy to manufacture. However, although the raw water in the jetting pipe can form a high-speed jet, creating negative pressure in the negative pressure tube, thereby drawing in activated granular sludge and anaerobic water from around the negative pressure tube of the jet distributor, and the mixed raw water, activated granular sludge, and anaerobic water are sprayed into the throat for efficient contact and biochemical reaction, the high-speed jet formed by the raw water neither rotates nor pulsates, thus exhibiting the aforementioned problem of a lack of pulsation in the jet. Summary of the Invention

[0008] (a) Technical problems to be solved

[0009] To address the shortcomings of existing technologies, this invention provides an aeration device for oily wastewater, which solves the problems mentioned in the background section.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, the present invention provides the following technical solution: an oily wastewater aeration device, installed at the end of a fluid medium discharge pipeline, comprising a pulsating flow generator, an outer sleeve, a tail pipe, a corrugated pipe, and a high-frequency vibration generator; one end of the outer sleeve is fixedly installed on the outer wall of the medium outlet end of the pulsating flow generator, and at least two inlet holes are provided on the middle side wall of the outer sleeve; the tail pipe is located at the other end of the outer sleeve, the corrugated pipe is installed at the medium outlet end of the tail pipe, and the high-frequency vibration generator is installed at the medium outlet end of the corrugated pipe; the pulsating flow generator, the outer sleeve, the tail pipe, and the corrugated pipe internally constitute an interconnected main channel for fluid medium flow;

[0012] The high-frequency vibration generator consists of a cylinder, a support plate, and multiple hollow thin tubes. The outer edge of the support plate is fixedly connected to the inner wall of the cylinder. Each thin tube passes through the support plate and is fixedly connected to the support plate. The corrugated tube is flexible.

[0013] When the fluid medium flowing in the main channel passes through the bellows, it impacts and collides with the bellows and the high-frequency vibration generator. The fluid medium undergoes lateral swaying and longitudinal movement at the end of the bellows near the high-frequency vibration generator. The fluid medium between the various bellows sections of the bellows undergoes eddy current oscillation, and the fluid medium is mixed and sheared under the eddy current oscillation.

[0014] Optionally, the diameter of the outlet end of the pulsating flow generator is smaller than the diameter of the inlet end. A liquid flow nozzle is fixedly connected to the outlet end of the pulsating flow generator. The outer wall of the liquid flow nozzle is inclined and gradually narrows towards the central axis. The liquid flow nozzle is close to the inlet hole of the outer tube. The fluid medium flows in the main channel, and the pressure inside the main channel decreases. The medium located outside the outer tube is affected by the pressure and enters the main channel through the inlet hole. The inlet hole of the outer tube and the liquid flow nozzle form a shear gap. When the medium passes through the shear gap, it forms a pressure shear flow.

[0015] Optionally, each of the aforementioned capillary tubes is arranged in an annular array on the support plate, and the length of each capillary tube gradually decreases from the edge of the support plate to the center. The outlet end of the cylinder is shaped like an outwardly expanding trumpet. The multiple capillary tubes arranged in an annular array on the support plate form an annular low-pressure zone due to the entrainment effect of the fluid medium during jetting. The fluid medium in the main channel forms a vortex under the influence of the flow rate difference between the annular low-pressure zone and capillary tubes of different lengths.

[0016] Optionally, a tripod is fixedly connected to the inner wall of the pulsating flow generator, and a central support tube is fixedly connected to the middle of the tripod along the axial direction. A rotating blade is rotatably connected to the outer wall of the upper end of the central support tube. The fluid medium in the main channel pushes the rotating blade to rotate around the central support tube. The rotating blade strikes the fluid medium, causing the fluid medium to rotate and flow in the main channel.

[0017] Optionally, the inner wall of the middle part of the pulsating flow generator is an annular protrusion that gradually contracts towards the center of the main channel. A first flow channel is formed in the inner cavity of the pulsating flow generator above the annular protrusion. The inlet diameter of the first flow channel is larger than the outlet diameter. A self-excited oscillation cavity is formed in the inner cavity of the pulsating flow generator below the annular protrusion. The cavity diameter of the self-excited oscillation cavity is larger than the outlet diameter of the first flow channel. After the fluid medium passes through the first flow channel, it jets into the self-excited oscillation cavity. The fluid medium expands in the self-excited oscillation cavity due to the expansion of space, and the fluid medium is dispersed into multiple flow bundles. Each flow bundle vibrates and oscillates in the self-excited oscillation cavity to form a pulsating flow.

[0018] Optionally, a conical collision wall is fixedly connected to the inner wall of the pulsating flow generator. A first liquid flow hole is opened in the middle of the conical collision wall, and the tip of the conical collision wall faces the direction of the fluid medium flow. The conical collision wall divides the inner cavity of the pulsating flow generator into two self-excited oscillation chambers.

[0019] (III) Beneficial Effects

[0020] This invention provides an aeration device for oily wastewater, which has the following beneficial effects:

[0021] (1) The device shown in this invention has an axially continuous tubular body. After the fluid medium flows through the pulsating flow generator, it is sprayed downwards in a high-speed spiral motion. Multiple inlet holes are opened on the side wall of the outer tube. The size of the inlet holes is adjusted according to the actual situation to ensure that the entire aeration device can operate stably and reliably. The fluid medium flows in the main channel. The fluid medium velocity inside the main channel is fast, resulting in low pressure inside the main channel. The medium located outside the outer tube is affected by the pressure and enters the main channel through the inlet holes. The inlet holes of the outer tube and the liquid nozzle form a shear gap. The medium flows in the shear gap, that is, there is a velocity gradient of the medium on the cross-section. The medium is subjected to transverse shear force between them. When the medium passes through the shear gap, it forms a pressure shear flow. After the oily wastewater is sheared, the strength of the oil-water interface film is weakened, creating conditions for droplet coagulation. Therefore, the high-frequency vibration shear of this invention is beneficial to the separation of oil and water in oil-water emulsions and to the dehydration of crude oil, greatly enhancing the oil-water separation effect.

[0022] (2) By setting up the pulsating flow generator, the fluid medium rotates efficiently along the main channel, resulting in good stirring and shearing effects for oily wastewater. This keeps the fluid medium in a constant state of pulsating rotation, meaning it exhibits a pulsating effect. The pulsating flow is highly effective in enhancing heat and mass transfer. The pulsating characteristics of the flow are used to increase the driving force of the boundary region and expand the service area. The lower corrugated pipe significantly improves the turbulence characteristics of the jet, effectively enhancing the convection and diffusion capacity of air and wastewater, increasing the service area of ​​the aeration device shown in this application, and greatly improving the water-air mixing conditions. The airflow, through the oscillation of the self-excited oscillation chamber, achieves high dissolved oxygen efficiency, enhances the turbulence of the aerobic water body, generates a large number of small-diameter bubbles, and greatly reduces bubble aggregation, thereby improving dissolved oxygen aeration efficiency and enhancing oil-water separation. The oily wastewater aeration device shown in this application can be used in air flotation dissolved oxygenation devices.

[0023] (3) The device of this invention can utilize the high heat and mass transfer efficiency of pulsating airflow to greatly improve the mixing conditions of water and air, enabling water and air to mix fully and improving dissolved oxygen efficiency. At the same time, it drives the fluid to generate swirling flow and superimposed high-frequency vibration shearing action, so it can be applied to existing four-phase separator equipment. It is beneficial for oil-water separation of oil and gas field produced fluids. The swirling flow generated by it is conducive to the sedimentation and discharge of silt; the shearing vibration can reduce the strength of the interface film of dispersed phase droplets, promote droplet aggregation, and effectively improve the separation efficiency of oil-water emulsions.

[0024] (4) Oil-water emulsions in oil and gas field produced fluids are extremely difficult to separate. The usual method involves adding demulsifiers, which is costly and environmentally polluting. Existing processes, especially electro-dehydration, require large equipment investments, consume a lot of energy, and are cumbersome to operate and maintain. The advantage of the device of this invention is that it requires no additional electrical equipment. It relies solely on the momentum of the fluid medium, using a high-frequency vibration shearing component to generate a high-frequency vibration shearing effect. Integrating this device into existing oil-water separation processes, with its rotating flow and high-frequency vibration shearing, is expected to reduce operating costs and solve problems such as high equipment investment, large size, complex structure, limited installation versatility, difficult operation and maintenance, and high energy consumption.

[0025] (5) This device uses a special water guide pipe structure to make the water flow form a horizontal rotating flow and a vertical rising (or falling) flow in the reaction tank / aeration tank. This allows the water flow to generate circulation over a large area, increases the velocity gradient, reduces the energy consumption of mechanical stirring, and effectively reduces equipment investment and operating costs.

[0026] (6) The oily wastewater aeration device shown in this invention can be fixedly installed by means of threaded connection between the pulsating flow generator, the outer sleeve, and the tail pipe. The cost of easily eroded and damaged parts is low, and the installation, disassembly, and replacement are convenient and quick, thus having comprehensive advantages. This device can be used for aeration methods including but not limited to jet aeration, blower aeration, and powerful flow aeration, and has a wide range of application scenarios.

[0027] (7) The aeration device of the present invention can be installed in the pool by hoisting, which is convenient for installation and facilitates inspection and maintenance by staff. Wastewater can flow from top to bottom or from bottom to top, so that air and wastewater can come into contact in opposite or the same direction during this process, increasing the contact area of ​​the medium; when used in anoxic pools, this device can increase gas stirring, reduce the investment in mechanical mixers, reduce operating energy consumption, and reduce construction costs.

[0028] (8) Compared with existing technologies, this device not only generates a powerful flow, but also produces a pulsating rotating flow, i.e., a high-frequency vibration shearing effect by superimposing a rotating and pulsating flow. This allows the bioleaching sludge (referring to a mud-water mixture with a water content of 95.0-98.5% and containing oil) to reach the optimal mixing state, enhancing oxygen utilization and accelerating oil-water separation. Compared with existing technologies, the device has a simple structure and reliable operation. The corrugated pipe with a certain degree of toughness enhances the kinetic energy conversion of the fluid medium, achieving a wide range of vibration frequencies and impact momentum, high kinetic energy conversion efficiency, low energy consumption, low pressure loss, and low manufacturing cost. It is particularly suitable for oily wastewater treatment processes and also for bioleaching aeration treatment processes of oily sludge. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0030] Figure 1 This is a cross-sectional view of a second embodiment of an oily wastewater aeration device according to the present invention (arrows indicate the direction of fluid medium flow);

[0031] Figure 2 This is a three-dimensional structural diagram of a high-frequency vibration generator for an oily wastewater aeration device according to the present invention;

[0032] Figure 3 This is a cross-sectional structural schematic diagram of a high-frequency vibration generator for an oily wastewater aeration device according to the present invention;

[0033] Figure 4This is a top view schematic diagram of the high-frequency vibration generator of an oily wastewater aeration device according to the present invention;

[0034] Figure 5 This is a three-dimensional (looking down) structural schematic diagram of the high-frequency vibration generator of an oily wastewater aeration device according to the present invention;

[0035] Figure 6 This is a schematic diagram showing the flow direction of the fluid medium during the implementation of an oily wastewater aeration device according to the present invention;

[0036] Figure 7 This is a cross-sectional structural schematic diagram of an embodiment of an oily wastewater aeration device according to the present invention;

[0037] Figure 8 This is a cross-sectional structural schematic diagram of a third embodiment of an oily wastewater aeration device according to the present invention;

[0038] Figure 9 This is a cross-sectional structural schematic diagram of an embodiment four of the oily wastewater aeration device of the present invention.

[0039] In the diagram: 1. Bellows; 2. Tailpipe; 3. Outer tube; 301. Inlet hole; 4. High-frequency vibration generator; 401. Cylinder; 402. Thin tube; 403. Support plate; 5. Pulsating flow generator; 501. Liquid nozzle; 502. First flow channel; 503. Self-excited oscillation chamber; 504. Conical collision wall; 6. Tripod; 7. Rotating blade; 8. Central support tube. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] Example 1, please refer to Figure 7 This invention provides a technical solution: an oily wastewater aeration device, installed at the end of a fluid medium discharge pipeline. This oily wastewater aeration device includes a pulsating flow generator 5, an outer casing 3, a tail pipe 2, and a corrugated pipe 1. One end of the outer casing 3 is fixedly installed to the outer wall of the medium outlet end of the pulsating flow generator 5. At least two inlet holes 301 are opened on the middle side wall of the outer casing 3. The tail pipe 2 is located at the other end of the outer casing 3, and the corrugated pipe 1 is installed at the medium outlet end of the tail pipe 2. The pulsating flow generator 5, outer casing 3, tail pipe 2, and corrugated pipe 1 internally form an interconnected main channel for fluid medium flow. The corrugated pipe 1 is flexible. The corrugated pipe 1 can be made of materials such as stainless steel, rubber, or plastic.

[0042] When the fluid medium flowing in the main channel passes through the bellows 1, it impacts and collides with the bellows 1. The fluid medium undergoes lateral swaying and longitudinal movement at one end of the bellows 1. The fluid medium between each bellows of the bellows 1 undergoes vortex oscillation. The fluid medium is mixed and sheared under the vortex oscillation.

[0043] Tailpipe 2 serves to guide the flow.

[0044] Due to the high density of the fluid medium, the fluid medium at the outlet of the bellows 1 has discharge velocity and momentum. The high-density impact force generates compressive recoil force on the bellows of the bellows 1. Under the action of this recoil force, the entire body of the bellows 1 becomes unstable. In addition, the rotating flow impacting downwards also has a certain pulsating effect, that is, the pressure of this rotating jet contains a pulsating component. The impact force on each bellows of the bellows 1 changes periodically, thus creating disturbance or turbulence in the bellows 1. Originally, under the impact of the constant pressure jet, the lower end of the bellows 1 would deviate from the initial equilibrium position and elongate, but its own elasticity would cause it to contract. Thus, the bellows 1 reaches force equilibrium at a certain elongation point. Since objects always tend towards a state of equilibrium during motion, when the pulsating jet disturbs or turbules it, the equilibrium is broken by the disturbance and turbulence, forcing it not to remain stationary due to force equilibrium. That is, it is this disturbance or turbulence of the rotating pulsating flow that enables the bellows 1 to generate axial and radial vibration.

[0045] Under this disturbance, at least part or the entire corrugated pipe 1 periodically undergoes a whip-like oscillating motion, thereby generating a pulsating jet. This can be understood as the resonance between the walls of the corrugated pipe 1 causing multi-dimensional vibrations at its outlet, thus forming a pulsating jet. This ensures the effective generation of the pulsating jet. Alternatively, it can be understood that the internal fluid flow of the corrugated pipe 1 possesses momentum, and the energy converted from the flow obstruction causes the corrugated pipe 1 to undergo a whip-like oscillating motion through oscillation.

[0046] Under the impact of the fluid medium, the corrugated sections of the bellows 1 will generate rhythm, producing lateral swaying and longitudinal movement. This longitudinal movement causes the fluid medium to generate mechanical shearing and stirring effects when flowing between the corrugated sections. The fluid medium movement between adjacent corrugated sections will affect each other, generating violent eddy oscillations. Under the additional effect of the eddy oscillation field, the fluid medium (the fluid medium flowing through the bellows 1 is mainly composed of air, oily wastewater, etc.) is subjected to mixing and oscillating shearing effects. At the same time, the complex frequency vibration wave generated by the bellows 1 itself propagates in the fluid medium and further affects the fluid, thereby destroying the wax crystal structure, reducing the viscosity of crude oil, and enhancing the oil-water separation effect.

[0047] Specifically, the diameter of the outlet end of the pulsating flow generator 5 is smaller than the diameter of the inlet end. A liquid flow nozzle 501 is fixedly connected to the outlet end of the pulsating flow generator 5. The outer wall of the liquid flow nozzle 501 is inclined and gradually narrows towards the central axis. The liquid flow nozzle 501 is close to the inlet hole 301 of the outer sleeve 3. The fluid medium flows in the main channel, and the pressure inside the main channel decreases. The medium located outside the outer sleeve 3 is affected by the pressure and enters the main channel through the inlet hole 301. The inlet hole 301 of the outer sleeve 3 and the liquid flow nozzle 501 form a shear gap. When the medium passes through the shear gap, it forms a pressure shear flow.

[0048] In this process, the fluid medium flows within the main channel, where the high velocity causes a decrease in pressure. The medium outside the outer sleeve 3, influenced by this pressure, enters the main channel through the inlet 301. The inlet 301 and the flow nozzle 501 form a shear gap, allowing the medium to flow within this gap. This creates a velocity gradient across the medium's cross-section, resulting in mutual transverse shear forces between the media. As the medium passes through the shear gap, a pressure-driven shear flow is formed. The shearing action weakens the oil-water interface film, creating conditions for droplet coalescence. Therefore, this high-frequency vibration shearing method is beneficial for separating oil and water in oil-water emulsions and for crude oil dehydration, significantly enhancing the oil-water separation effect.

[0049] Due to the high-speed flow of the fluid medium inside the outer sleeve 3, the pressure inside the main channel decreases. The medium located outside the outer sleeve 3 is affected by the pressure and enters the main channel through the inlet hole 301. When the medium is sucked into the main channel, a shear gap is formed between the inlet hole 301 of the outer sleeve 3 and the liquid flow nozzle 501. The medium flows in the shear gap, which causes the medium to have violent collision and friction with the gap of the inlet hole 301 and the outer wall of the liquid flow nozzle 501. Some of the large air bubbles in the water are impacted tangentially and broken by the wall edge of the shear gap of the inlet hole 301. The large air bubbles that are sucked in along the shear gap are cut into numerous micro bubbles under the violent friction with the inner wall of the outer sleeve 3 (or the inner wall of the tail pipe 2), thereby increasing the contact area between air and sewage, achieving full mixing of air and sewage, and improving dissolved oxygen efficiency.

[0050] More specifically, a tripod 6 is fixedly connected to the inner wall of the pulsating flow generator 5. A central support pipe 8 is fixedly connected axially to the middle of the tripod 6. A rotating blade 7 is rotatably connected to the outer wall of the upper end of the central support pipe 8. The fluid medium in the main flow channel pushes the rotating blade 7 to rotate around the central support pipe 8. The rotating blade 7 rotates and strikes the fluid medium, causing the fluid medium to rotate and flow in the main flow channel. The rotating blade 7 consists of multiple blades and a bushing. Each blade is arranged in a ring and fixedly connected to the outer wall of the bushing. The bushing is fitted onto the outer wall of the upper end of the central support pipe 8, and the bushing is rotatably connected to the central support pipe 8.

[0051] The pulsating flow generator 5, at its medium inlet end, can be threadedly connected to the blower outlet pipe (the external equipment's air supply pipe, i.e., the air source for the aeration device). Under the pressure energy of the high-pressure fluid medium, the rotating blades 7 generate a rotational torque force, rotating at high speed under this torque. When the fluid medium pressure energy increases, the rotating blades 7 respond rapidly, deflecting quickly or slowly depending on their own pressure bearing capacity, changing with the fluid parameters within the flow channel. This converts the pressure energy into the rotational kinetic energy of the rotating blades 7 and the fluid, achieving a corresponding non-uniform rotational conversion and corresponding damping. This results in smooth pressure changes, a tendency for pressure balance within the flow channel, and more uniform fluid medium flow, thereby reducing the adverse effects of undulating flow (i.e., water hammer) on the central support pipe 8 and the rotating blades 7. This makes the overall output pressure regulation process more stable and smooth, eliminating vibration and noise.

[0052] The tripod 6 divides the inner cavity of the pulse flow generator 5 into three channels. The three streams of rotating fluid input into the three channels are mixed in the mixing chamber and then immediately pushed into the conical inner cavity of the flow nozzle 501. The fluid is compressed in the conical inner cavity, thereby reducing the loss of rotational potential energy of the rotating column and the loss of kinetic potential energy of the high-pressure fluid. This causes the fluid to collide and rub against the conical inner wall of the flow nozzle 501. The self-rotating fluid is pressurized by the flow channel inside the end flow nozzle 501, generating a more efficient pulsed rotating jet flow. Compared to traditional round-hole nozzles (where the internal diameter of the nozzle, from the inlet channel to the nozzle orifice, remains constant), in situations like high-pressure direct water jetting, constant-pressure continuous water jets tend to disperse due to the water jet effect. Without a pressure chamber and flow stabilization structure, they lack strong flow stabilization, the jet doesn't rotate, and the fluid flow direction after spraying is unstable. Fluid dispersion and jet dispersion prevent stress concentration, resulting in a lack of pulsation components and blind spots at edges or uneven surfaces. This prevents the complete removal of embedded dirt, reducing water jet cleaning efficiency and affecting cleaning effectiveness.

[0053] Example 2, please refer to Figures 1 to 6 The difference between this embodiment and embodiment one is that: an oily wastewater aeration device further includes a high-frequency vibration generator 4, which is installed at the medium outlet end of the corrugated pipe 1. The high-frequency vibration generator 4 is composed of a cylinder 401, a support plate 403, and a plurality of hollow thin tubes 402. The outer edge of the support plate 403 is fixedly connected to the inner wall of the cylinder 401. Each thin tube 402 passes through the support plate 403, and the middle outer wall of each thin tube 402 is fixedly connected to the support plate 403 (the height distance from the two ends of each thin tube 402 to the support plate 403 is equal). The corrugated pipe 1 is flexible.

[0054] When the fluid medium flowing in the main channel passes through the bellows 1, it impacts and collides with the bellows 1 and the high-frequency vibration generator 4. The fluid medium undergoes lateral swaying and longitudinal movement at the end of the bellows 1 near the high-frequency vibration generator 4. The fluid medium between the various bellows of the bellows 1 undergoes eddy oscillation. The fluid medium is mixed and sheared under the eddy oscillation.

[0055] Specifically, each capillary tube 402 is arranged in an annular array on the support plate 403, and the length of each capillary tube 402 gradually decreases from the edge of the support plate 403 to the center. The outlet end of the cylinder 401 is shaped like an outwardly expanding trumpet. The multiple capillary tubes 402 arranged in an annular array on the support plate 403 form an annular low-pressure zone due to the entrainment effect of the fluid medium during jetting. The fluid medium in the main channel forms a vortex under the influence of the flow rate difference between the annular low-pressure zone and the capillary tubes 402 of different lengths.

[0056] The bellows 1 reduces the impact force of the mixed fluid medium. The weakened mixed fluid medium still has a considerable impact force and is accompanied by superimposed radial rotation and axial pulsation oscillating flow characteristics. This rotating oscillating flow enters the high-frequency vibration generator 4 from the lower end of the bellows 1. The fluid medium in the main channel forms vortices under the influence of the flow difference between the annular low-pressure zone and the capillary tubes 402 of different lengths. During the repeated formation of vortices, the flow rate of the capillary tubes 402 in the high-frequency vibration generator 4 is forced to change periodically, forming a periodically changing oscillating force. This oscillating force is then applied to each capillary tube 402, causing the high-frequency vibration generator 4 to vibrate. This causes the capillary tubes 402 arranged regularly on the high-frequency vibration generator 4 to form an unsteady pipe flow, that is, to form an oscillating jet or a pulsating jet.

[0057] The high-frequency vibration of the capillary tube 402 causes pulsating jets at its outlet, i.e., turbulent and unstable flow. Inside the horn-shaped nozzle cavity, each capillary tube 402 becomes a nozzle. Each nozzle forms an annular low-pressure zone due to the entrainment effect of the jet. The entrainment effect of the jets from numerous nozzles creates numerous annular low-pressure zones. Under the influence of the flow rate difference between the annular low-pressure zones and capillary tubes of different lengths in the main flow channel, vortices are formed. Vortices are generated continuously or repeatedly, resulting in a large number of bubbles. These bubbles are generated in the low-pressure zones, move, expand, and collapse in the water, creating significant water hammer pressure that acts on the water. During the repeated formation of vortices, periodically changing oscillating forces are also generated, thereby realizing the oscillating force and acting on the external oily wastewater, causing pulsation in the water. This cycle repeats continuously, utilizing this periodically changing oscillating force (i.e., pulsating characteristics) to increase the driving force and service area of ​​the boundary region.

[0058] The peristalsis of the corrugated pipe 1 drives the high-frequency vibration generator 4 at its lower part to peristalse as well, causing the entire device to produce a sweeping effect that moves up, down, left, right, forward, and backward. The pulsating force combined with the rotational force results in higher pressure transmission efficiency and better relief of pressure buildup, while also expanding the jet service area in three dimensions. The high-frequency vibration of the high-frequency vibration generator 4 significantly improves the stress condition of the sewage at the lower part of the device. This not only greatly improves the water-air mixing conditions and increases the oxygen conversion efficiency, but also enhances the turbulence of the aerobic water body, improves the convection and diffusion capacity, and generates a large number of small-diameter bubbles with greatly reduced bubble aggregation, thereby improving the aeration effect.

[0059] The working principle of the device of this invention involves the theory of pressurized transient flow and fluid dynamics, the principle of Helmholtz resonance effect and resonance, and the multiple structural coupling effects and harmonic functional characteristics of the Helmholtz resonator. The oily wastewater aeration device shown in this application can be excited by harmonics to form resonance, thereby inducing resonance and high-frequency vibration.

[0060] Example 3, please refer to Figure 8 Compared with Embodiment 2 (which refers to the technical solution combining Embodiment 2 and Embodiment 1), this embodiment has the following distinguishing technical features: the inner wall of the middle part of the pulsating flow generator 5 is an annular protrusion that gradually contracts towards the center of the main channel. A first flow channel 502 is formed in the inner cavity of the pulsating flow generator 5 above the annular protrusion. The inlet diameter of the first flow channel 502 is larger than the outlet diameter. A self-excited oscillation cavity 503 is formed in the inner cavity of the pulsating flow generator 5 below the annular protrusion. The cavity diameter of the self-excited oscillation cavity 503 is larger than the outlet diameter of the first flow channel 502. After the fluid medium passes through the first flow channel 502, it jets into the self-excited oscillation cavity 503. The fluid medium expands in the self-excited oscillation cavity 503 due to the expansion of space, and the fluid medium is dispersed into multiple flow bundles. Each flow bundle vibrates and oscillates in the self-excited oscillation cavity 503 to form a pulsating flow.

[0061] The pulsating flow generator 5 includes a liquid flow nozzle 501. The outer wall of the medium outlet end of the pulsating flow generator 5 is threadedly connected to the outer sleeve 3. By adjusting the thread connection depth between the two, the size of the shear gap formed by the liquid flow nozzle 501 and the inlet hole 301 can be adjusted.

[0062] In practical implementation, the main body of the pulsating flow generator 5 and the liquid flow nozzle 501 can be installed separately as two components. Both the main body of the pulsating flow generator 5 and the liquid flow nozzle 501 can be threadedly connected to the outer sleeve 3 to form a self-excited oscillation chamber 503. This means that the shape and size of the self-excited oscillation chamber 503, and the collision walls at different angles (the conical wall on the side of the liquid flow nozzle 501 closest to the self-excited oscillation chamber 503), can be matched in real time on-site according to different process parameters such as inlet pressure, inlet flow rate, and flow velocity. This enables on-site performance optimization, thereby ensuring good hydraulic mixing and wastewater treatment effect. For different working pressures, the length of the self-excited oscillation chamber 503 can be continuously adjusted by rotating the liquid flow nozzle 501, thereby converting the continuous jet into a strong pulsed jet. Furthermore, all parts of the entire device are easy to process and replace.

[0063] The tailpipe 2 and the outer sleeve 3 can be connected by a threaded connection. The connection depth between the tailpipe 2 and the outer sleeve 3 facilitates adjustment of the shape and size of the inlet hole 301 on the side wall of the outer sleeve 3, and facilitates adjustment of the gas-water distribution ratio (the ratio of the flow rate of the liquid fluid medium entering the inlet hole 301 to the flow rate of the gaseous fluid medium entering the pulsating flow generator 5 per unit time). The structural dimensions are determined according to the working water depth, making it easy to optimize the circulating flow pattern.

[0064] The oily wastewater aeration device disclosed in this application has a simple and detachable structure. The jet frequency of the self-excited pulse jet can be changed by replacing the main body of the pulse flow generator 5 with different diameters, the liquid flow nozzle 501, or by adjusting the effective cavity length. On-site adjustment and optimization of the oscillation chamber structure are convenient.

[0065] Example 4, please refer to Figure 9 The difference between this embodiment and embodiment 1 is that a conical collision wall 504 is fixedly connected to the inner wall of the pulsating flow generator 5. A first liquid flow hole is opened in the middle of the conical collision wall 504. The tip of the conical collision wall 504 faces the direction of the fluid medium flow. The conical collision wall 504 divides the inner cavity of the pulsating flow generator 5 into two self-excited oscillation chambers 503.

[0066] The pulsating flow generator 5 consists of a pulsating flow generator body, a liquid flow nozzle 501, and a conical collision wall 504. Each of these components can exist independently. The lower ends of the liquid flow nozzle 501 and the pulsating flow generator body are threaded to the outer sleeve 3. The outer edge of the conical collision wall 504 is threaded to the inner wall of the pulsating flow generator body.

[0067] The outer edge of the conical collision wall 504 is threaded to the inner wall of the pulsating flow generator body, thereby allowing adjustment of the shape and size of the two self-excited oscillation cavities 503.

[0068] By adding a self-excited oscillation chamber 503 within the pulsating flow generator 5, the shape and size of the oscillation chamber can be adjusted. During the oscillation of this multi-stage oscillation chamber, gas with a certain kinetic energy is compressed and stored during the pressure cycle, and expands and releases energy during the relaxation cycle, causing the jet pressure to increase. Therefore, this invention becomes a pulsating jet aerator that can be used even at low pressures. It can increase the jet pressure generated by the jet by 30% to 50% or more, thereby greatly enhancing the impact force and destructive effect of the jet, improving the working efficiency of the jet, and achieving energy saving. More precisely, by setting two self-excited oscillation chambers 503, due to the good symmetry of the chambers, it is easy to form resonant pulses. Utilizing the resonant jet theory, energy is accumulated, the jet velocity is amplified, and the jet force is greater, thereby increasing the service area and effectively improving mass transfer and energy transfer efficiency, thus enhancing the aeration effect.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An oil-containing wastewater aeration device installed at the end of a fluid medium discharge pipeline, characterized by: It comprises a pulsating flow generator (5), an outer sleeve (3), a tail pipe (2), a bellows (1) and a high-frequency vibration generator (4); one end of the outer sleeve (3) is fixedly installed with the outer wall of the medium outflow end of the pulsating flow generator (5), at least two inflow holes (301) are formed on the side wall of the middle part of the outer sleeve (3), the tail pipe (2) is arranged at the other end of the outer sleeve (3), the bellows (1) is installed at the medium outflow end of the tail pipe (2), and the high-frequency vibration generator (4) is installed at the medium outflow end of the bellows (1); the pulsating flow generator (5), the outer sleeve (3), the tail pipe (2) and the bellows (1) internally constitute a main flow channel which is connected and used for fluid medium flow; The high-frequency vibration generator (4) is composed of a cylinder (401), a support plate (403) and a plurality of hollow thin tubes (402); the outer side edge of the support plate (403) is fixedly connected with the inner side wall of the cylinder (401), each thin tube (402) penetrates the support plate (403), and each thin tube (402) is fixedly connected with the support plate (403); the bellows (1) has flexibility; When the fluid medium flowing in the main flow channel impacts and collides with the bellows (1) and the high-frequency vibration generator (4), the fluid medium near the high-frequency vibration generator (4) end of the bellows (1) occurs transverse shaking and longitudinal fluctuation, the fluid medium between each bellows section of the bellows (1) occurs vortex oscillation, and the fluid medium is mixed and oscillation sheared under the vortex oscillation.

2. An oil-containing wastewater aeration device according to claim 1, characterized in that: The straight length of the outflow end nozzle of the pulsating flow generator (5) is smaller than that of the inflow end nozzle, the outflow end of the pulsating flow generator (5) is fixedly connected with a liquid flow nozzle (501), the outer side wall of the liquid flow nozzle (501) is inclined to the central axis and gradually converges, and the liquid flow nozzle (501) is close to the inflow hole (301) of the outer sleeve (3); the fluid medium flows in the main flow channel, the internal pressure of the main flow channel is reduced, the medium outside the outer sleeve (3) is affected by the pressure and enters the main flow channel through the inflow hole (301), the inflow hole (301) of the outer sleeve (3) and the liquid flow nozzle (501) form a shearing gap, and the medium forms a pressure shear flow when passing through the shearing gap.

3. An oil-containing wastewater aeration device according to claim 1, characterized in that: Each thin tube (402) is arranged in an annular array on the support plate (403), and the length of each thin tube (402) gradually shortens from the edge to the center of the support plate (403), and the outflow end nozzle of the cylinder (401) is trumpet-shaped outwardly expanding; the plurality of thin tubes (402) arranged in an annular array on the support plate (403) form an annular low-pressure area due to the entrainment effect on the fluid medium when the jet flow occurs; The fluid medium in the main flow channel forms a vortex under the influence of the flow difference between the annular low-pressure area and the thin tubes (402) with different lengths.

4. An oil-containing wastewater aeration device according to claim 2, characterized in that: The inner side wall of the pulsating flow generator (5) is fixedly connected with a tripod (6), the middle part of the tripod (6) is fixedly connected with a center support tube (8) in the axial direction, the outer side wall of the upper end of the center support tube (8) is rotatably connected with a rotating blade (7), the fluid medium in the main flow passage pushes the rotating blade (7) to rotate around the center support tube (8), the rotating blade (7) rotates and strikes the fluid medium, so that the fluid medium rotates and flows in the main flow passage.

5. An oil-containing wastewater aeration device according to claim 2, characterized in that: The middle part of the inner side wall of the pulsating flow generator (5) is in the shape of an annular protrusion gradually shrinking towards the center of the main flow passage, a first flow passage (502) is formed in the inner cavity of the pulsating flow generator (5) and above the annular protrusion, the inlet aperture of the first flow passage (502) is larger than the outlet aperture, a self-excited oscillation cavity (503) is formed in the inner cavity of the pulsating flow generator (5) and below the annular protrusion, the cavity diameter of the self-excited oscillation cavity (503) is larger than the outlet aperture of the first flow passage (502); after the fluid medium passes through the first flow passage (502), the jet flow enters the self-excited oscillation cavity (503), the fluid medium expands due to the expansion of space in the self-excited oscillation cavity (503), the fluid medium is dispersed into multiple flow beams, and each flow beam vibrates and oscillates in the self-excited oscillation cavity (503) to form a pulsating flow.

6. An oil-containing wastewater aeration device according to claim 2, characterized in that: The inner side wall of the pulsating flow generator (5) is fixedly connected with a tapered collision wall (504), a first liquid flow hole is formed in the middle part of the tapered collision wall (504), the tip of the tapered collision wall (504) faces the direction of the incoming fluid medium, and the tapered collision wall (504) divides the inner cavity of the pulsating flow generator (5) into two self-excited oscillation cavities (503).

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