A mixing and agitation method for a phosphorus removal process

Abstract

The application provides a mixing and stirring method for a phosphorus removal process, comprising the following steps: step 10, adding a medicament into a medicament cavity of a medicament adding part, and the medicament enters a hub of an impeller through a hollow pipe body of a transmission shaft; a driving part drives the transmission shaft to drive the impeller to rotate; step 20, the medicament in the hub of the impeller is sprayed out in different directions at different heights and enters a water body under the action of centrifugal force, the speed of the medicament sprayed out by the medicament outlet holes at different cross sections from top to bottom of the hub is different, so that the medicament at different heights, different directions and different radius ranges in one circle of the hub is mixed with the water body; the blades of the impeller make the mixed liquid form a tangential mixed fluid, and the tangential mixed fluid is mixed and diluted with the water body again, and the mixing range is expanded. The mixing and stirring method for the phosphorus removal process can realize sufficient dissolution of the medicament in a mixing pool, and the position of the inlet and outlet water does not need to be considered.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and specifically relates to a mixing and stirring method for phosphorus removal processes. Background Technology

[0002] In the phosphorus removal process of wastewater treatment, reagent mixing is a process in which the reagent and the influent are rapidly mixed under the action of a mixer. The dosing point is located at the bottom of the mixer impeller, near the inlet. There are only two flow patterns in the mixing zone: the first is "bottom in, top out" flow, where water enters from the bottom and exits from the top; the second is "top in, bottom out" flow, where water enters from the top and exits from the bottom. Otherwise, the reagents will not be sufficiently mixed, resulting in short-circuiting. Existing mixing methods have the following shortcomings:

[0003] 1. It cannot achieve "upward-inward-out" and "downward-inward-out" flow patterns;

[0004] 2. Using a single-point drug injection method, the drug is diluted with water and then stirred by a stirring device. The high concentration of the drug is quickly carried away by the stirring device, resulting in uneven mixing.

[0005] 3. The mixture of the reagent and water produces a swirling flow, resulting in poor turbulence and preventing further mixing.

[0006] 4. When the fluid generated by the impeller of the mixer flows to the pool wall, it moves upward. After reaching the water surface, it moves downward around the drive shaft. The mixing effect of the inner and outer rings (radial direction) in the mixing pool is uneven. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a mixing and stirring method for phosphorus removal process, which can achieve full dissolution of the reagent in the mixing tank without considering the position of the inlet and outlet water.

[0008] To address the aforementioned technical problems, embodiments of the present invention provide a mixing and stirring method for a phosphorus removal process, comprising the following steps:

[0009] Step 10: Add the agent to the dosing chamber of the dosing unit. The agent enters the impeller hub through the hollow tube of the drive shaft. The drive unit drives the drive shaft to rotate the impeller.

[0010] In step 20, under the action of centrifugal force, the agent inside the impeller hub flies out of the outlet at different heights in various directions and enters the water. The speed at which the agent is sprayed out of the outlet at different cross-sections of the hub from top to bottom is different, so that the agent mixes with the water at different heights, directions and radii around the hub. The action of the impeller blades causes the mixture to form a tangential mixed fluid, which mixes and dilutes with the water again, expanding the mixing range.

[0011] As a further improvement to this embodiment of the invention, in step 20, the agent inside the impeller hub, under the action of centrifugal force, flies out through the outlet holes at different heights in various directions and enters the water. The speed at which the agent is sprayed outward from the outlet holes at different cross-sections of the hub from top to bottom is different, thereby allowing the agent to mix with the water at different heights, directions, and radii around the hub. Specifically, this includes:

[0012] Under the influence of centrifugal force, the agent inside the first hub is ejected from the first outlet at different heights in various directions and enters the water. The speed at which the agent is ejected from the first outlet at different cross-sections of the first hub varies, with the first outlet near the first parting surface having a higher ejection speed than the one farther away. This allows the agent to dissolve more fully in the water within different radii. Consequently, the agent mixes with the water at different heights, directions, and radii around the first hub, thus diluting the agent throughout the entire space.

[0013] Under the influence of centrifugal force, the agent inside the second hub is ejected from the second outlet at different heights in various directions and enters the water. The speed at which the agent is ejected from the second outlet at different cross-sections of the second hub varies from top to bottom. The ejection speed of the second outlet near the second parting surface is greater than that of the outlet farther away from the second parting surface, allowing the agent to dissolve more fully in the water within different radii. This ensures that the agent mixes with the water at different heights, directions, and radii around the second hub, thus diluting the agent throughout the entire space.

[0014] As a further improvement to this embodiment of the invention, in step 20, the blades of the impeller cause the mixture to form a tangentially mixed fluid, which is then further mixed and diluted with the water, specifically including:

[0015] From the first parting surface to the top, the diameter of the cross-section of the first upper hub gradually decreases. As the first upper hub rotates, the velocity of the tangential mixed fluid generated by the first blades on each cross-section of the first upper hub gradually decreases, thus forming an upward and outward flowing first mixed fluid around the first upper hub. From the first parting surface to the bottom, the diameter of the cross-section of the first lower hub gradually decreases. As the first lower hub rotates, the velocity of the tangential mixed fluid generated by the first blades on each cross-section of the first lower hub gradually decreases, thus forming a downward and outward flowing second mixed fluid around the first lower hub.

[0016] From the second parting surface to the top, the diameter of the cross-section of the second upper hub gradually decreases. As the second upper hub rotates, the velocity of the tangential mixed fluid generated by the second blades on each cross-section of the second upper hub gradually decreases, thus forming a third mixed fluid flowing upward and outward around the second upper hub. From the second parting surface to the bottom, the diameter of the cross-section of the second lower hub gradually decreases. As the second lower hub rotates, the velocity of the tangential fluid generated by the second blades on each cross-section of the second lower hub gradually decreases, thus forming a fourth mixed fluid flowing downward and outward around the second lower hub.

[0017] As a further improvement of this embodiment of the invention, in step 20, the mixing range of the tangential mixing fluid formed around the first hub in the radial direction of the mixing pool is 1 / 5 to 1 / 3 of the diameter of the mixing pool; the mixing range of the tangential mixing fluid formed around the second hub in the radial direction of the mixing pool can cover the entire mixing pool.

[0018] As a further improvement of this embodiment of the invention, in step 20, the first mixed fluid formed around the first upper hub flows upward and outward. After reaching a certain height, due to the gradual weakening of its own tangential flow velocity, it changes to flowing downward and inward, continuously circulating and mixing to enhance the mixing effect; the second mixed fluid formed around the first lower hub flows downward and outward, and the third mixed fluid formed around the second upper hub flows upward and outward; the third mixed fluid formed around the upper part of the second upper hub interacts with the second mixed fluid, and after the two fluids flowing in opposite directions collide, they are fully diluted and mixed, and then flow outward tangentially under the action of the first and second blades, respectively merging into the second and third mixed fluids, enhancing the mixing effect of the second and third mixed fluids, so that the agent can be more fully dissolved in the surrounding water; the third mixed fluid formed around the middle and lower part of the second upper hub flows upward and outward, and after encountering the pool wall, it changes to flowing upward and inward under the reflection of the pool wall. After reaching a certain height, due to the gradual weakening of its own tangential flow velocity and under the action of inertia, it changes to flowing downward and inward; the third As the mixed fluid flows upward, the third mixed fluid formed around the center of the second upper hub interacts with the first mixed fluid, diluting and mixing the two fluids to enhance the mixing effect. As the third mixed fluid flows downward, it again interacts with the first mixed fluid, colliding and further diluting and mixing the two fluids, resulting in a more uniform dissolution of the agent and further improving the mixing effect. The fourth mixed fluid formed around the second lower hub flows downward and outward, then, upon encountering the pool wall, changes to a downward and inward flow due to reflection from the wall. Upon encountering the pool bottom, it changes to an upward and inward flow due to reflection from the bottom. During its upward flow, it first interacts with the fourth mixed fluid formed around the lower center of the second lower hub, colliding and further diluting and mixing the two fluids, resulting in a more uniform dissolution of the agent and further improving the mixing effect. Then, continuing its upward flow, it interacts with the third mixed fluid formed around the second upper hub, further diluting and mixing the two fluids and further improving the mixing effect. The interaction of the four mixed fluids generated by the impeller causes the mixture to diffuse outwards, mixing with the agent continuously sprayed at high speed from the hub, enhancing the dilution and mixing of the agent.

[0019] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: The present invention provides a mixing and stirring method for phosphorus removal process, in which the agent is added to the dosing chamber of the dosing component, and the agent enters the hub through the hollow tube of the drive shaft. The drive component drives the drive shaft to rotate the hub. Under the action of centrifugal force, the agent flies out from the dosing holes located at different heights and directions of the hub and enters the water. Moreover, the speed at which the agent is sprayed outward from the dosing holes at different cross-sections of the hub from top to bottom is different, and the radial flow radius of the agent entering the water is different. Thus, the agent is mixed with the water at different heights, directions and radii around the hub. It changes the conventional single-point agent dosing point to a multi-point spatial dosing point that radiates from the top to the bottom of the hub and outwards, improving the dilution and mixing effect of the entire space in the first stage. The initially diluted mixture generates a new fluid flow under the action of the blades, thereby improving the overall mixing effect in the mixing tank. Simultaneously, the high-speed rotating blades create a local vacuum at the junction of the hub and blades, accelerating the flow of the agent from the hub's inner cavity through the outlet at the junction. As the hub rotates at high speed, the agent ejected at high speed from the outlet at the junction continuously impacts the slower-moving mixture at other outlets, further enhancing the dilution effect. The fully dissolved mixture in the mixing tank is no longer limited by the inlet and outlet positions and orientations. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention 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.

[0021] Figure 1 This is a schematic diagram of the mixing and stirring device used in the method of this embodiment of the invention;

[0022] Figure 2 yes Figure 1 A schematic diagram of the middle impeller.

[0023] The diagram includes: drive unit 1, dosing unit 2, drive shaft 3, impeller 4, first hub 41, first upper hub 411, first lower hub 412, first blade 413, first dosing hole 414, second hub 42, second upper hub 421, second lower hub 422, second blade 423, second dosing hole 424, connector 43, mixing tank 5, and dosing pipe 6. Detailed Implementation

[0024] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] For ease of description, the following terms "first parting surface" refers to the horizontal plane passing through the first hub diameter, and "second parting surface" refers to the horizontal plane passing through the second hub diameter.

[0026] This invention provides a mixing and stirring method for a phosphorus removal process, employing methods such as... Figure 1 The diagram illustrates a mixing and stirring device for a phosphorus removal process. This device includes a drive unit 1, a dosing unit 2, a drive shaft 3, an impeller 4, and a dosing pipe 6. The drive unit 1 is connected to the top end of the drive shaft 3 and drives the drive shaft 3 to rotate. The drive unit 1 is fixed to the top of a mixing tank 5 and can be a motor, which is connected to the top end of the drive shaft 3 via a reducer. The dosing unit 2 includes a shell with an open top and a closed bottom, forming a dosing chamber inside the shell. The dosing unit 2 is fixedly connected to the drive shaft 3, and the dosing unit 2 and the drive shaft 3 are coaxially arranged; rotation of the drive shaft 3 drives rotation of the dosing unit 2. The outlet end of the dosing pipe 6 is inserted into the dosing chamber from the top opening of the shell, and the dosing pipe 6 is used to add chemicals to the dosing chamber of the dosing unit. The drive shaft 3 includes a hollow tube body with a closed top and an open bottom, and an inlet hole is provided at the top of the hollow tube body, located in the dosing chamber of the dosing unit. Preferably, the top of the dosing component 2 is located above the liquid surface in the mixing tank to ensure that all the agent enters the inner cavity of the drive shaft 3.

[0027] In this embodiment, the impeller 4 has a hollow hub with an opening at its top. The bottom end of the hollow tube is connected to the hub of the impeller 4, and the bottom opening of the hollow tube is opposite to the top opening of the hub. Thus, the dosing chamber of the dosing unit, the cavity of the hollow tube, and the cavity of the hub are sequentially connected. The hub surface has dosing holes arranged on the circumference of the hub at different heights from top to bottom. Blades are provided on the hub.

[0028] The mixing and stirring method provided in this embodiment includes the following steps:

[0029] Step 10: The agent is added to the dosing chamber of the dosing unit 2, and the agent enters the hub of the impeller 4 through the hollow tube of the drive shaft 3. The drive unit 1 drives the drive shaft 3 to rotate the impeller 4.

[0030] In step 20, under the action of centrifugal force, the agent inside the hub of impeller 4 is ejected from the outlet at different heights and in various directions, entering the water. The speed at which the agent is ejected from the outlet at different cross-sections of the hub varies from top to bottom, thus ensuring that the agent mixes with the water at different heights, directions, and radii around the hub. The blades of impeller 4 cause the mixture to form a tangentially mixed fluid, which further mixes and dilutes with the water, expanding the mixing range.

[0031] In the mixing and stirring method of the above embodiment, the agent is added to the dosing chamber of the dosing device. The agent enters the hub through the hollow tube of the drive shaft. The drive component drives the drive shaft to rotate the hub. Under the action of centrifugal force, the agent flies out from the dosing holes located at different heights and directions of the hub and enters the water. Moreover, the speed at which the agent is sprayed out from the dosing holes at different cross-sections of the hub from top to bottom is different, and the radial flow radius of the agent entering the water is different. This allows the agent to be mixed with the water at different heights, directions and radii around the hub. It changes the conventional single-point agent dosing point to a multi-point spatial dosing point that radiates from the top to the bottom of the hub and outwards, improving the dilution and mixing effect of the entire space in the first stage. The initially diluted mixture generates a new fluid flow under the action of the blades, thereby improving the overall mixing effect in the mixing tank. Simultaneously, the high-speed rotating blades create a local vacuum at the junction of the hub and blades, accelerating the flow of the agent from the hub's inner cavity through the outlet at the junction. As the hub rotates at high speed, the agent ejected at high speed from the outlet at the junction continuously impacts the slower-moving mixture at other outlets, further enhancing the dilution effect. The fully dissolved mixture in the mixing tank is no longer limited by the inlet and outlet positions and orientations.

[0032] As a preferred example, such as Figure 2 As shown, the impeller 4 includes a first hub 41, a connecting body 43, and a second hub 42 connected sequentially from top to bottom. All three components—first hub 41, connecting body 43, and second hub 42—are hollow structures. The top of the first hub 41 has an opening, and the bottom of the hollow tube is connected to the first hub 41. The dosing component, hollow tube, first hub 41, connecting body 43, and second hub 42 are sequentially connected. The surface of the first hub 41 is uniformly provided with first dosing holes 414, and the surface of the second hub 42 is uniformly provided with second dosing holes 424. The first hub 41 has a first blade 413, and the second hub 42 has a second blade 423. Preferably, both the first hub 41 and the second hub 42 are spherical. Preferably, both the first blade 413 and the second blade 423 are radial blades, and the number of each blade is 3-5. The radial first and second blades form a high-speed tangential flow of the pre-diluted mixture, further improving the mixing and dilution effect.

[0033] The first hub 41 is a thin-walled hollow sphere, symmetrically arranged above and below the first parting surface. The upper hub 411 is above the first parting surface, and the lower hub 412 is below it. This symmetrical arrangement of the upper and lower hubs reduces the axial force on the drive component 1, thus improving the service life of the device. The second hub 42 is also a thin-walled hollow sphere, symmetrically arranged above and below the second parting surface. The upper hub 421 is above the second parting surface, and the lower hub 422 is below it. This symmetrical arrangement also reduces the axial force on the drive component 1.

[0034] Step 20 specifically includes:

[0035] Under the influence of centrifugal force, the agent within the first hub 41 is ejected from the first outlet at different heights in various directions and enters the water. The speed at which the agent is ejected from the first outlet at different cross-sections of the first hub 41 varies, with the outlet closer to the first parting surface exhibiting a higher ejection speed than the outlet further away. This allows the agent to dissolve more thoroughly in the water within different radii. Thus, the agent mixes with the water at different heights, directions, and radii around the first hub (i.e., throughout the entire three-dimensional space), continuously diluting the agent throughout the space and overcoming the limitations of existing technologies that dilute only on a single horizontal plane and within a single radius.

[0036] The diameter of the cross-section of the first upper hub 411 gradually decreases from the first parting surface to the top. As the first upper hub 411 rotates, the velocity of the tangential mixed fluid generated by the first blades on each cross-section of the first upper hub gradually decreases, and the spray range also gradually decreases. Thus, a first mixed fluid flowing upward and outward is formed around the first upper hub. The diameter of the cross-section of the first lower hub 412 gradually decreases from the first parting surface to the bottom. As the first lower hub 412 rotates, the velocity of the tangential mixed fluid generated by the first blades on each cross-section of the first lower hub gradually decreases, and the spray range also gradually decreases. Thus, a second mixed fluid flowing downward and outward is formed around the first lower hub 412.

[0037] The high-speed tangentially mixed fluid generated by the action of the first blade is mixed and diluted again with the water in the outer ring of the first blade, expanding the movement range of the mixed liquid and forming a mixing effect with different heights, directions and radii, thereby improving the dilution and mixing effect of the entire space.

[0038] Under centrifugal force, the agent within the second hub 42 is ejected at different heights and in various directions through the second outlet and enters the water. The ejection speed of the agent from the second outlet varies at different cross-sections of the second hub from top to bottom. Specifically, the ejection speed from the second outlet near the second parting surface is greater than that from the outlet further away, allowing the agent to dissolve more thoroughly in the water within different radii. Thus, the agent mixes with the water at different heights, directions, and radii (i.e., throughout the entire three-dimensional space) around the second hub, continuously diluting the agent throughout the space and overcoming the limitations of existing technologies that dilute only on a single horizontal plane and within a single radius.

[0039] The diameter of the cross-section of the second upper hub 421 gradually decreases from the second parting surface to the top. As the second upper hub 421 rotates, the velocity of the tangential mixed fluid generated by the second blades on each cross-section of the second upper hub gradually decreases, and the spray range also gradually decreases. Thus, a third mixed fluid flowing upward and outward is formed around the second upper hub 421. Similarly, the diameter of the cross-section of the second lower hub 422 gradually decreases from the second parting surface to the bottom. As the second lower hub 422 rotates, the velocity of the tangential fluid generated by the second blades on each cross-section of the second lower hub gradually decreases, and the spray range also gradually decreases. Thus, a fourth mixed fluid flowing downward and outward is generated around the second lower hub 422.

[0040] The high-speed tangential mixing fluid generated by the action of the second blade mixes and dilutes again with the water in the outer ring of the second blade, expanding the movement range of the mixture and forming a mixing effect at different heights, directions and radii, thereby improving the dilution and mixing effect of the entire space.

[0041] In the above embodiment, each hub forms two symmetrically distributed mixed fluids around its circumference, resulting in a total of four mixed fluids formed along the height direction by the two hubs. The first mixed fluid formed around the first upper hub 411 flows upwards and outwards. After reaching a certain height, its tangential velocity gradually decreases, causing it to flow downwards and inwards, continuously circulating and mixing to enhance the mixing effect. The second mixed fluid formed around the first lower hub 412 flows downwards and outwards, while the third mixed fluid formed around the second upper hub 421 flows upwards and outwards. The second and third mixed fluids interact, colliding and fully diluting and mixing. Then, under the action of the first blade 413 and the second blade 423, they flow outwards tangentially, merging back into the second and third mixed fluids, further enhancing their mixing effect and allowing the agent to dissolve more fully in the surrounding water. The fourth mixed fluid formed around the second lower hub 422 flows downwards and outwards. Upon encountering the pool bottom, it changes to flow upwards and inwards due to reflection from the bottom, continuously circulating and mixing to enhance the mixing effect. At the same time, by enhancing the mixing effect at the bottom of the pool, the length of the drive shaft can be shortened, thereby increasing the service life of the device.

[0042] In a preferred embodiment, the diameter of the first hub 41 is smaller than the diameter of the second hub 42, the width of the first blade 413 is smaller than the width of the second blade 423, and the outer diameter of the first impeller formed by the first hub 41 and the first blade 413 is smaller than the outer diameter of the second impeller formed by the second hub 42 and the second blade 423. Preferably, the mixing tank 5 is cylindrical, and the diameter of the first hub 41 is 1 / 5 to 1 / 3 of the diameter of the second hub 42.

[0043] The first hub 41 and the second hub 42 are connected by a connector 43 to form a hub. The diameter of the first hub 41 is smaller than the diameter of the second hub 42, and the width of the first blade 413 is smaller than the width of the second blade 423. The outer diameter of the first impeller formed by the first hub 41 and the first blade 413 is smaller than the outer diameter of the second impeller formed by the second hub 42 and the second blade 423. The entire impeller is gourd-shaped. The velocity of the tangentially mixed fluid formed by the first impeller in one revolution is lower than the velocity of the tangentially mixed fluid formed by the second impeller in one revolution. The radial area that the tangentially mixed fluid formed by the first impeller in one revolution can cover in the mixing pool is smaller than the radial area that the tangentially mixed fluid formed by the second impeller in one revolution can cover in the mixing pool.

[0044] Because the outer diameter of the first impeller is small, the tangential mixing fluid formed around its circumference has a small mixing range in the radial direction of the mixing tank, mainly flowing and mixing in the region near the drive shaft. The radial mixing range is 1 / 5 to 1 / 3 of the mixing tank diameter. Because the outer diameter of the second impeller is large, the tangential mixing fluid formed around its circumference has a larger mixing range in the radial direction of the mixing tank, covering the entire mixing tank. The tangential mixing fluid formed around the second impeller flows throughout the mixing tank from the drive shaft to the tank wall, and is the main fluid for reagent mixing, resulting in better fluid mixing. Simultaneously, the fluid formed around the second impeller interacts with the fluid formed around the first impeller, further enhancing the overall turbulence effect within the mixing tank, allowing the inlet and outlet of the mixing tank to be arbitrarily set regardless of the dosing point.

[0045] In step 20, the first mixed fluid formed around the first upper hub 411 flows upward and outward. After reaching a certain height, its tangential velocity gradually decreases, and it then flows downward and inward, continuously circulating and mixing to enhance the mixing effect. The second mixed fluid formed around the first lower hub 412 flows downward and outward, while the third mixed fluid formed around the second upper hub 421 flows upward and outward. The third mixed fluid formed around the upper part of the second upper hub interacts with the second mixed fluid. After the two opposing fluids collide, they are fully diluted and mixed. Then, under the action of the first blade 413 and the second blade 423, it flows outward tangentially and merges back into the second and third mixed fluids, respectively, enhancing their mixing effect and allowing the agent to dissolve more fully in the surrounding water. The third mixed fluid formed around the middle and lower part of the second upper hub flows upward and outward. Upon encountering the pool wall, it changes to flow upward and inward due to reflection from the wall. After reaching a certain height, its tangential velocity gradually decreases, and due to inertia, it changes to flow downward and inward. As the third mixed fluid flows upward, it interacts with the first mixed fluid formed around the center of the second upper hub, diluting and mixing the two fluids to enhance the mixing effect. As the third mixed fluid flows downward, it again interacts with the first mixed fluid, colliding and further diluting and mixing the two fluids, resulting in a more uniform dissolution of the agent and further improving the mixing effect. The fourth mixed fluid formed around the second lower hub 422 flows downward and outward. Upon encountering the pool wall, it changes to a downward and inward flow due to reflection from the wall. Upon encountering the pool bottom, it changes to an upward and inward flow due to reflection from the bottom. During its upward flow, it first interacts with the fourth mixed fluid formed around the lower center of the second lower hub, colliding and further diluting and mixing the two fluids, resulting in a more uniform dissolution of the agent and further improving the mixing effect. Then, continuing to flow upward, it interacts with the third mixed fluid formed around the second upper hub, further diluting and mixing the two fluids and further improving the mixing effect. The interaction of the four mixed fluids generated by the impeller causes the mixture to diffuse in all directions, mixing with the agent continuously sprayed at high speed from the hub, enhancing the dilution and mixing of the agent.

[0046] As a preferred example, the height H of the connector 43 is 100–500 mm. Preferably, the connector 43 is cylindrical. Choosing a larger size H allows for a greater distance between the first lower hub 412 and the second upper hub 421, enabling more thorough dilution of the agent after spraying between the first and second parting surfaces. Then, the two diluted mixtures are further blended and diluted. Finally, under the action of the blades, the mixture undergoes centrifugal motion outwards, mixing the twice-diluted mixture with the water surrounding the blades, thereby improving the mixing effect of the agent. Simultaneously, the high-speed rotating blades create a local vacuum at the junction of the hub and blades, accelerating the flow rate of the agent from the inner cavity of the hub through the outlet at the junction. As the hub rotates at high speed, the high-speed agent ejected from the outlet at the junction continuously impacts the slower-moving mixture at other outlets, thus improving the dilution effect.

[0047] The mixing and stirring method of this preferred embodiment includes the following steps:

[0048] Water enters the mixing tank 5 through the inlet pipe, and the chemical is introduced into the dosing unit 2 through the dosing pipe 6. The chemical in the dosing unit 2 enters the inner cavity of the drive shaft 3 through the inlet on the drive shaft 3, and then sequentially enters the inner cavity of the first hub, the inner cavity of the connecting body, and the inner cavity of the second hub through the bottom opening of the drive shaft. The drive unit 1 is activated, which drives the drive shaft 3 to rotate, and also drives the first hub and the second hub to rotate.

[0049] When the first hub rotates at high speed, the agent inside the first hub, under the action of centrifugal force, is ejected from the first outlet at different heights in various directions and enters the surrounding water. The speed at which the agent is ejected from the first outlet at different cross-sections of the first hub from top to bottom varies. Specifically, the ejection speed of the first outlet near the first parting surface is greater than that of the first outlet farther from the first parting surface, and the radial flow radius of the agent entering the water varies. Thus, the agent undergoes a pre-mixing process with the water at different heights, directions, and radii (i.e., throughout the entire three-dimensional space) around the first hub, resulting in continuous dilution of the agent throughout the space. The action of the first blade 413 generates a high-speed tangentially mixed fluid, which further mixes and dilutes with the water around the outer ring of the first blade, expanding the movement range of the mixed liquid and creating a mixing effect at different heights, directions, and radii (positions), thereby improving the dilution and mixing effect throughout the space. Meanwhile, the high-speed rotating blades create a local vacuum at the junction of the hub and the blades, thereby accelerating the flow of the agent from the inner cavity of the hub through the outlet at the junction. As the hub rotates at high speed, the agent ejected at high speed from the outlet at the junction of the hub and the blades continuously impacts the mixture at other outlets with lower speeds, thereby improving the dilution effect.

[0050] Two symmetrical mixed fluids are formed around the first hub 41. Above the first parting surface, the diameter of the cross-section of the first upper hub gradually decreases from the first parting surface to the top. The tangential mixed fluid velocity generated by the first blades on each cross-section of the first upper hub gradually decreases accordingly. Therefore, the flow direction of the first mixed fluid formed around the first upper hub 411 is from bottom to top and outward. Below the first parting surface, the diameter of the cross-section of the first lower hub 412 gradually decreases from the first parting surface to the bottom. The tangential mixed fluid velocity generated by the first blades on each cross-section of the first lower hub gradually decreases accordingly. Therefore, the flow direction of the second mixed fluid formed around the first lower hub 412 is from top to bottom and outward.

[0051] When the second hub rotates at high speed, the agent inside the hub, under the action of centrifugal force, is ejected from the second outlet at different heights in various directions and enters the surrounding water. The speed at which the agent is ejected from the second outlet at different cross-sections of the second hub varies from top to bottom. Specifically, the ejection speed of the second outlet near the second parting surface is greater than that of the outlet farther away from the second parting surface, and the radial flow radius of the agent entering the water varies. Thus, the agent undergoes a first pre-mixing with the water at different heights, directions, and radii (i.e., throughout the entire three-dimensional space) around the second hub, resulting in continuous dilution of the agent throughout the space. The action of the second blade 423 generates a high-speed tangential mixing fluid, which further mixes and dilutes with the water around the outer ring of the second blade, expanding the movement range of the mixed liquid and creating a mixing effect at different heights, directions, and radii (positions), thereby improving the dilution and mixing effect throughout the space. Meanwhile, the high-speed rotating blades create a local vacuum at the junction of the hub and the blades, thereby accelerating the flow of the agent from the inner cavity of the hub through the outlet at the junction. As the hub rotates at high speed, the agent ejected at high speed from the outlet at the junction of the hub and the blades continuously impacts the mixture at other outlets with lower speeds, thereby improving the dilution effect.

[0052] The second hub 42 forms two symmetrically arranged mixed fluids around its circumference. Above the second parting surface, the diameter of the cross-section of the second upper hub gradually decreases from the second parting surface to the top. Consequently, the tangential mixed fluid velocity generated by the second blades on each cross-section of the second upper hub gradually decreases. Therefore, the flow direction of the third mixed fluid formed around the second upper hub 421 is from bottom to top and outwards. Below the second parting surface, the diameter of the cross-section of the second lower hub 422 gradually decreases from the second parting surface to the bottom. Consequently, the tangential mixed fluid velocity generated by the second blades on each cross-section of the second lower hub gradually decreases. Therefore, the flow direction of the fourth mixed fluid formed around the second lower hub 422 is from top to bottom and outwards.

[0053] The first mixed fluid formed around the first upper hub 411 flows upward and outward. After reaching a certain height, its tangential velocity gradually decreases, and it then flows downward and inward, continuously circulating and mixing to enhance the mixing effect. The second mixed fluid formed around the first lower hub 412 flows downward and outward, while the third mixed fluid formed around the second upper hub 421 flows upward and outward. The third mixed fluid formed around the upper part of the second upper hub interacts with the second mixed fluid. After the two opposing flow streams collide, they are fully diluted and mixed. Then, under the action of the first blade 413 and the second blade 423, it flows outward tangentially, merging back into the second and third mixed fluids, respectively, enhancing their mixing effect and allowing the agent to dissolve more fully in the surrounding water. The third mixed fluid formed around the middle and lower part of the second upper hub flows upward and outward. Upon encountering the pool wall, it changes to flow upward and inward due to reflection from the wall. After reaching a certain height, its tangential velocity gradually decreases, and due to inertia, it changes to flow downward and inward. As the third mixed fluid flows upward, it interacts with the first mixed fluid formed around the center of the second upper hub, diluting and mixing the two fluids to enhance the mixing effect. As the third mixed fluid flows downward, it again interacts with the first mixed fluid, colliding and further diluting and mixing the two fluids, resulting in a more uniform dissolution of the agent and further improving the mixing effect. The fourth mixed fluid formed around the second lower hub 422 flows downward and outward. Upon encountering the pool wall, it changes to a downward-inward flow due to reflection from the wall, and upon encountering the pool bottom, it changes to an upward-inward flow due to reflection from the bottom. During its upward flow, it first interacts with the fourth mixed fluid formed around the lower center of the second lower hub, colliding and further diluting and mixing the two fluids, resulting in a more uniform dissolution of the agent and further improving the mixing effect. Then, continuing its upward flow, it interacts with the third mixed fluid formed around the second upper hub, further diluting and mixing the two fluids and further improving the mixing effect. The interaction of the four mixed fluids generated by the impeller causes the mixture to diffuse in all directions, mixing with the agent continuously sprayed at high speed from the hub, enhancing the dilution and mixing of the agent.

[0054] The mixture formed by mixing and dilution continuously serves as a new medium around the first and second hubs, undergoing a new round of dilution and mixing with the continuously sprayed agents in the hubs.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A mixing and stirring method for a phosphorus removal process, characterized in that, Includes the following steps: Step 10: Add the agent into the dosing chamber of the dosing device (2), and the agent enters the hub of the impeller (4) through the hollow tube of the drive shaft (3); the drive device (1) drives the drive shaft (3) to rotate the impeller (4); Step 20: Under the action of centrifugal force, the agent in the hub of the impeller (4) flies out of the outlet at different heights in different directions and enters the water body. The speed at which the agent is sprayed out of the outlet at different cross-sections of the hub from top to bottom is different, so that the agent is mixed with the water body at different heights, directions and radii around the hub. The blade action of the impeller (4) causes the mixture to form a tangentially mixed fluid, which is then mixed and diluted with the water again, expanding the mixing range; In step 20, the blades of the impeller (4) cause the mixture to form a tangentially mixed fluid, which is then mixed and diluted with the water again, specifically including: The diameter of the cross-section of the first upper hub (411) gradually decreases from the first parting surface to the top. As the first upper hub (411) rotates, the velocity of the tangential mixed fluid generated by the first blade on each cross-section of the first upper hub gradually decreases, thus forming an upward and outward flowing first mixed fluid around the first upper hub. The diameter of the cross-section of the first lower hub (412) gradually decreases from the first parting surface to the bottom. As the first lower hub (412) rotates, the velocity of the tangential mixed fluid generated by the first blade on each cross-section of the first lower hub gradually decreases, thus forming a downward and outward flowing second mixed fluid around the first lower hub (412). The diameter of the cross section of the second upper hub (421) gradually decreases from the second parting surface to the top. As the second upper hub (421) rotates, the velocity of the tangential mixed fluid generated by the second blade on each cross section of the second upper hub gradually decreases, thus forming an upward and outward flow of the third mixed fluid around the second upper hub (421). The diameter of the cross section of the second lower hub (422) gradually decreases from the second parting surface to the bottom. As the second lower hub (422) rotates, the tangential fluid velocity generated by the second blade on each cross section of the second lower hub gradually decreases, thereby generating a fourth mixed fluid flowing downward and outward around the second lower hub (422).

2. The mixing and stirring method according to claim 1, characterized in that, In step 20, the agent inside the impeller (4) is ejected from the outlet at different heights and in different directions through the outlet holes under the action of centrifugal force and enters the water. The speed at which the agent is ejected from the outlet holes at different cross-sections of the impeller from top to bottom is different, so that the agent mixes with the water at different heights, directions and radii around the impeller, specifically including: Under the action of centrifugal force, the agent in the first hub (41) is ejected from the first outlet at different heights in various directions and enters the water body. The speed at which the agent is ejected from the first outlet at different cross-sections of the first hub from top to bottom is different. The ejection speed of the first outlet near the first parting surface is greater than that of the first outlet far from the first parting surface, so that the agent can be more fully dissolved in the water body of different radii. Thus, the agent is mixed with the water body at different heights, directions and radii around the first hub, so that the agent is diluted throughout the space. Under the influence of centrifugal force, the agent inside the second hub is ejected from the second outlet at different heights in various directions and enters the water. The speed at which the agent is ejected from the second outlet at different cross-sections of the second hub varies from top to bottom. The ejection speed of the second outlet near the second parting surface is greater than that of the outlet farther away from the second parting surface, allowing the agent to dissolve more fully in the water within different radii. This ensures that the agent mixes with the water at different heights, directions, and radii around the second hub, thus diluting the agent throughout the entire space.

3. The mixing and stirring method according to claim 1, characterized in that, In step 20, the mixing range of the tangential mixing fluid formed by the first hub (41) in one revolution is 1 / 5 to 1 / 3 of the diameter of the mixing pool in the radial direction; the mixing range of the tangential mixing fluid formed by the second hub (42) in one revolution can cover the entire mixing pool in the radial direction.

4. The mixing and stirring method according to claim 1, characterized in that, In step 20, the first mixed fluid formed around the first upper hub (411) flows upward and outward. After reaching a certain height, it gradually weakens due to its own tangential flow velocity and changes to flow downward and inward, continuously circulating and mixing to enhance the mixing effect. The second mixed fluid formed around the first lower hub (412) flows downward and outward, while the third mixed fluid formed around the second upper hub (421) flows upward and outward. The third mixed fluid formed around the upper part of the second upper hub interacts with the second mixed fluid. After the two fluids with opposite flow directions collide, they are fully diluted and mixed. Then, under the action of the first blade (413) and the second blade (423), it flows outward tangentially and merges into the second mixed fluid and the third mixed fluid respectively, enhancing the mixing effect of the second mixed fluid and the third mixed fluid, so that the agent can be more fully dissolved in the surrounding water. The third mixed fluid formed around the lower part of the second upper hub flows upward and outward. Upon encountering the pool wall, it changes to flow upward and inward due to the reflection effect of the pool wall. After rising to a certain height, due to the gradual decrease in its own tangential fluid velocity and the effect of inertia, it changes to flow downward and inward. During the upward flow of the third mixed fluid, the third mixed fluid formed around the middle part of the second upper hub interacts with the first mixed fluid, and the two fluids are diluted and mixed, enhancing the mixing effect. During the downward flow of the third mixed fluid, it interacts with the first mixed fluid again. After the two fluids collide, they are fully diluted and mixed, making the drug dissolve more evenly and further improving the mixing effect. The fourth mixed fluid formed around the second lower hub (422) The fluid flows downwards and outwards, then, upon encountering the pool wall, changes to a downward-inward flow due to reflection from the wall. Upon encountering the pool bottom, it changes to an upward-inward flow due to reflection from the bottom. During the upward flow, it first interacts with the fourth mixed fluid formed around the lower part of the second lower hub. The collision of the two fluids thoroughly dilutes and mixes them, resulting in a more uniform dissolution of the agent and further improving the mixing effect. Then, it continues to flow upwards and interacts with the third mixed fluid formed around the second upper hub. The two fluids thoroughly dilute and mix, further improving the mixing effect. The interaction of the four mixed fluids generated by the impeller causes the mixture to diffuse in all directions, mixing with the agent continuously sprayed at high speed from the hub, thus enhancing the dilution and mixing of the agent.

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