A vortex sedimentation device

Abstract

This invention provides a vortex grit settling device, comprising: a vortex grit settling tank, the vortex grit settling tank including an inlet section, a vortex section, and an outlet section, the inlet section being connected to the vortex section, and the outlet section also being connected to the vortex section; the vortex section uses centrifugal force to cause particles in wastewater to settle; and a counter-vortex device, the counter-vortex device being spiral-shaped, the outlet of the counter-vortex device being connected to the inlet section of the vortex grit settling tank. This invention optimizes the particle arrangement entering the vortex grit settling tank by setting a counter-vortex device at the front end of the vortex grit settling tank, utilizing the capture effect of large particles on small particles, thereby improving the separation efficiency of sand and gravel with a particle size of less than 0.2 mm.

Description

Technical Field

[0001] This utility model relates to the technical field of vortex sedimentation, and in particular to a vortex sedimentation device. Background Technology

[0002] Grit chambers are designed to remove sand and gravel with a relative density of 1.3 to 2.7 and a particle size of 0.1 mm to 0.3 mm.

[0003] Taking a vortex grit chamber as an example, it can remove 95% of sand and gravel ≥0.297mm, but only 70% of sand and gravel ≥0.105mm.

[0004] Because the influent particles in the cyclone sedimentation tank are in a uniformly mixed state, the separation efficiency of sand and gravel <0.2mm by centrifugal force + gravity is limited. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a vortex sedimentation device.

[0006] This utility model provides the following technical solution: a cyclone sedimentation device, comprising:

[0007] A vortex grit chamber includes an inlet section, a vortex section, and an outlet section. The inlet section is connected to the vortex section, and the outlet section is also connected to the vortex section. The vortex section uses centrifugal force to cause particles in the wastewater to settle.

[0008] A counter-rotating device, which is spiral in shape, has its outlet connected to the inlet of the vortex sedimentation tank;

[0009] Wastewater flows into the vortex generator through its inlet and passes sequentially through the outlet, the inlet section, and the vortex section before flowing out from the outlet section. The vortex generator is spiral-shaped, so that when the wastewater enters the vortex section, larger and smaller particles in the wastewater are closer to the axis of the vortex section.

[0010] Furthermore, the inner radius of the counterrotator is 0.3m to 0.5m.

[0011] Furthermore, the vertical cross-sectional shape and size of the counter-rotating device are consistent with the vertical cross-section of the inlet section of the vortex sedimentation tank.

[0012] Furthermore, the ratio of the width to the height of the vertical cross-section of the counterrotator is 2:1.

[0013] Furthermore, the total length of the vortex is equal to the time required for a particle to move from the inside of the vortex to the outside of the vortex multiplied by the particle's linear velocity.

[0014] Furthermore, the inlet section is arranged tangentially to the vortex section so that wastewater passing through the counter-vortex generator and the inlet section enters the vortex section tangentially.

[0015] The beneficial effects of this utility model are: by setting a counter-rotating device at the front end of the vortex sedimentation tank, the particle sorting entering the vortex sedimentation tank is optimized, and the capture effect of large particles on small particles is utilized, thereby improving the separation efficiency of sand and gravel with a particle size of less than 0.2mm. Attached Figure Description

[0016] Figure 1 This is a top view of the present invention.

[0017] Figure 2 This is a schematic diagram of the first three-dimensional structure of the counterrotator of this utility model.

[0018] Figure 3 This is a schematic diagram of the second three-dimensional structure of the counter-rotator of this utility model.

[0019] The labels in the attached diagram are: 10-Swirl sedimentation tank, 11-Inlet section, 12-Swirl section, 13-Outlet section, 20-Counter-rotator, 21-Inner radius, 22-Height, 23-Width, 24-Inlet, 25-Outlet, 26-Large particles, 27-Small particles. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0021] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] A vortex sedimentation device, such as Figure 1 As shown, it includes: a vortex grit chamber 10 and a counter-vortex device 20;

[0024] The vortex grit chamber 10 includes an inlet section 11, a vortex section 12, and an outlet section 13. The inlet section 11 is connected to the vortex section 12, and the outlet section 13 is also connected to the vortex section 12. The vortex section 12 uses centrifugal force to settle the particles in the sewage.

[0025] Specifically, such as Figure 1 As shown, the inlet section 11 is a straight waterway and is arranged along the tangent of the vortex section 12 so that the sewage passing through the counter-vortex 20 and the inlet section 11 enters the vortex section 12 in a tangential direction.

[0026] The swirling section 12 includes a cylindrical pool body, a sand hopper at the bottom of the pool body, and an agitator at the axial position of the pool body; wherein, the agitator is used to drive the sewage in the pool body into a swirling state, the sand hopper is used to collect the settled solid particles; the cylindrical pool body is used to constrain the sewage in it, so that the water flow moves downward along the pool wall in a spiral rotation, forming a strong swirling flow.

[0027] like Figure 1 As shown, the water outlet 13 and the water inlet 11 are located on the same side, and the sewage that has passed through the vortex section 12 is discharged from the water outlet 13.

[0028] Specifically, the vortex grit chamber 10 is existing technology, and its working principle can be found below:

[0029] Wastewater enters the cylindrical pool at high speed in a tangential direction through the inlet section 11;

[0030] This tangential water inlet method endows the water flow with a strong initial rotational momentum, known as angular momentum.

[0031] Under the constraint of the cylindrical pool and the stirring action of the agitator, the water flows down the pool wall in a spiral motion, forming a strong vortex.

[0032] In a high-speed rotating vortex, solid particles in the water flow are subjected to a strong centrifugal force;

[0033] The centrifugal force exerted by denser sand particles is much greater than that of less dense organic suspended matter and wastewater itself.

[0034] Under the action of centrifugal force, the sand particles are thrown towards the pool wall;

[0035] At the same time, the sand particles themselves are subject to gravity, which accelerates their settling as they are thrown against the pool wall and slide down the pool wall;

[0036] Meanwhile, the less dense organic suspended matter, due to the smaller centrifugal force it experiences, mostly remains in the central region of the eddy and rises with the water flow.

[0037] The sand particles thrown against the pool wall by centrifugal force slide down the pool wall under the combined action of gravity and spiral water flow; eventually, the sand particles settle and gather in the sand hopper at the bottom of the pool.

[0038] After being separated by vortex flow, the water, having removed most of the sand particles, rotates and rises to the top of the pool.

[0039] Water flows out of the vortex section 12 through the outlet section 13 set at the edge of the pool top and enters the subsequent treatment unit.

[0040] like Figure 2 and Figure 3 As shown, the counter-rotator 20 is spiral in shape, and the outlet 25 of the counter-rotator 20 is connected to the inlet 11 of the vortex grit chamber 10.

[0041] Wastewater flows into the vortex 20 through the inlet 24 and passes through the outlet 25, the inlet section 11, and the vortex section 12 in sequence before flowing out from the outlet section 13. The vortex 20 is spiral-shaped so that when the wastewater enters the vortex section 12, the large particles 26 and the smaller particles 27 in the wastewater are closer to the axis of the vortex section 12.

[0042] It is understandable that a counter-rotating device 20 is set at the front end of the vortex sedimentation tank 10 to optimize the particle sorting entering the vortex sedimentation tank 10, and to improve the separation efficiency of sand and gravel with a particle size of less than 0.2mm by utilizing the capture effect of large particles 26 on small particles 27.

[0043] First, the wastewater enters the counter-cyclone 20. At the inlet, the particles are in a disordered state. After entering the cyclone, the particles move outwards due to centrifugal force. Since larger particles 26 move faster than smaller particles 27, the particle arrangement from the outside to the inside of the wastewater at the outlet of the counter-cyclone 20 is as follows: from largest to smallest. See details... Figure 3 Schematic diagram of particle sorting at the inlet and outlet of the counter-rotator 20;

[0044] After entering the vortex sedimentation tank 10, the large particles 26 are closer to the axis of the vortex section 12 than the small particles 27, while the small particles 27 are closer to the outer tank wall. Since the large particles 26 move faster than the small particles 27 in the vortex, they can "capture" the small particles 27 through the "collision-entrainment" mechanism, thereby significantly improving the separation efficiency of ≤0.2mm sand and gravel.

[0045] The specific design parameters of the cyclotron 20 are as follows:

[0046] The flow velocity inside the counter-vortex 20 channel is 2.0 m / s to 3.0 m / s, and the inner radius 21r of the counter-vortex 20 is 0.3 m to 0.5 m. The vertical cross-sectional shape and dimensions of the counter-vortex 20 are consistent with the vertical cross-section of the inlet section of the vortex sedimentation tank, with a width 23 to height 22 ratio of 2:1. The total length of the counter-vortex 20 is equal to the time required for particles to move from the inside to the outside multiplied by the particle linear velocity, i.e., the flow velocity of the water inside the counter-vortex 20 channel.

[0047] The calculation is as follows:

[0048] Table 1. Distribution of Gravel in Municipal Domestic Sewage

[0049]

[0050]

[0051] Among them, gravel with a particle size of 0.1mm to 0.3mm accounts for 55% to 75% of the total gravel, and the counter-rotator is designed to move from the inner side to the outermost side with a particle size of 0.3mm.

[0052] The calculation formula is as follows:

[0053]

[0054] Among them, u r r is the radial velocity of the particle. p Where p is the particle radius (m); p The density of gravel is 2650 kg / m³. 3 Typical values ​​for quartz sand); p w The density of water (1000 kg / m³) 3 ); α is the centrifugal acceleration α = v 2 / r, (v is the particle linear velocity, r is the inner radius of the vortex flow channel); μ is the dynamic viscosity of water (1.002×10-3 Pa·s, 20℃);

[0055] Calculation example:

[0056] With an influent flow rate Q = 1000 m³ 3 / d, particle size 0.3mm, vertical cross-sectional dimensions of the counter-rotator: width multiplied by height = 10cm multiplied by 5cm; particle linear velocity u = 1000 ÷ 24 ÷ 60 ÷ 60 ÷ 0.1 ÷ 0.05 = 2.31m / s; radial velocity of the particles u r =8.82cm / s; the time required for a 0.3mm particle to move from the inside to the outside is t = 10 ÷ 8.82 = 1.13s; therefore, the total length of the counter-rotator channel is designed to be 2.62m.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A cyclonic grit removal device characterised in that, include: A vortex grit chamber includes an inlet section, a vortex section, and an outlet section. The inlet section is connected to the vortex section, and the outlet section is also connected to the vortex section. The vortex section uses centrifugal force to cause particles in the wastewater to settle. A counter-rotating device, which is spiral in shape, has its outlet connected to the inlet of the vortex sedimentation tank; Wastewater flows into the vortex generator through its inlet and passes sequentially through the outlet, the inlet section, and the vortex section before flowing out from the outlet section. The vortex generator is spiral-shaped, so that when the wastewater enters the vortex section, larger and smaller particles in the wastewater are closer to the axis of the vortex section.

2. The cyclonic grit trap of claim 1, wherein The inner radius of the counter-rotator is 0.3m to 0.5m.

3. The cyclonic grit trap of claim 1, wherein The vertical cross-sectional shape and size of the counter-rotating device are consistent with the vertical cross-section of the inlet section of the vortex sedimentation tank.

4. A cyclonic grit trap according to claim 3, wherein The ratio of the width to the height of the vertical cross-section of the vortex is 2:

1.

5. A cyclonic grit trap according to claim 4, wherein The total length of the vortex is equal to the time required for a particle to move from the inside of the vortex to the outside of the vortex multiplied by the particle's linear velocity.

6. The cyclonic grit trap of claim 1, wherein The inlet section is arranged tangentially to the vortex section so that wastewater passing through the counter-vortex and the inlet section enters the vortex section tangentially.

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