Device for improving efficiency of horizontal flow precipitation separation process based on turbulent laminar flow and shallow pool precipitation
By setting up a multi-layer inverted V-shaped folding plate and a bottom mud scraper in the advection sedimentation tank, the hydraulic fluid state is changed, and the problem of floating objects at the bottom of the advection sedimentation tank is solved, achieving more efficient precipitation effect and stable water effluent quality.
Patent Information
- Application Number
- CN202510489892.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2025-07-04
AI Technical Summary
In the existing water quality water purification treatment, the advection sedimentation tank has the problem of floating up the bottom suspended substance, which leads to an increase in the turbidity of the effluent, especially when running at full load or overload, which is poor.
The n-layer inverted V-shaped folding plates are arranged in the advection precipitation tank along the water depth direction, forming a multi-layer parallel structure, changing the hydraulic flow state at the bottom of the tank, reducing the Reynolds number, and promoting the water flow toward laminar flow, and the rapid precipitation and discharge of particulate matter is achieved through the inverted V-shaped folding plates and the bottom mud scraper.
It improves the precipitation efficiency, stabilizes the precipitation effect, prevents the bottom sludge from floating, ensures that the water quality of the effluent does not return to the mud again, and reduces the turbidity of the effluent.
Smart Images
Figure CN120242550A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of water purification treatment, and specifically to a device for improving the efficiency of the horizontal sedimentation separation process based on turbulent and laminar flow and shallow pond sedimentation. Background Art
[0002] At present, in the existing conventional water purification treatment processes, the sedimentation process is an essential link, and its treatment structures generally adopt tank types such as horizontal sedimentation tanks and inclined tube (plate) sedimentation tanks. Due to the strong anti-shock load capacity of horizontal sedimentation tanks, relatively simple operation and management, and relatively stable effluent water quality, this tank type is widely used in existing large and medium-sized water plants. With the general improvement of water quality targets, it has become normal for the turbidity (internal control) of the water after sedimentation (before filtration) to be below 1 NTU. Almost more than 90% of the existing horizontal sedimentation tanks at home and abroad have problems such as the floating of flocs at the rear end and the increase in turbidity. Existing water plants mainly improve water quality through strengthening conventional treatment. For some flocculation sedimentation tanks built for a long time with relatively compact design parameters and operating at full load or overload, the sedimentation effects vary greatly. How to improve the sedimentation effect and further reduce the effluent turbidity has become a common problem to be solved. Therefore, a device for improving the efficiency of the horizontal sedimentation separation process based on turbulent and laminar flow and shallow pond sedimentation is proposed. Summary of the Invention
[0003] Aiming at the deficiencies of the existing technology, the present invention provides a device for improving the efficiency of the horizontal sedimentation separation process based on turbulent and laminar flow and shallow pond sedimentation, and solves the problems raised in the above background art.
[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A device for improving the efficiency of the horizontal sedimentation separation process based on turbulent and laminar flow and shallow pond sedimentation, including a bottom fixed support fixedly connected to the bottom of an inverted V-shaped baffle, a side fixed support fixedly connected to the side of the inverted V-shaped baffle, the bottom fixed support, the side fixed support and the inverted V-shaped baffle form an inverted V-plate group, the cross-section of the inverted V-shaped baffle is an inverted V shape, a resilient card slot is opened at the edge of the plate surface of the inverted V-shaped baffle, the resilient card slot has resilience, the side fixed support is fixedly installed on the side wall of the horizontal sedimentation tank body, and the inverted V-shaped baffle can be made of stainless steel, plastic or other materials with relatively stable forming.
[0005] Optionally, a vertical V-shaped full-section integrated horizontal water collection device at the end of a horizontal flow sedimentation tank is installed inside the horizontal sedimentation tank body. The vertical V-shaped full-section integrated horizontal water collection device at the end of the horizontal flow sedimentation tank includes a formed water collection trough, an overflow weir and a V-shaped perforated water collection pipe. The formed water collection trough is arranged at the top of the overflow weir, the bottom of the overflow weir is fixedly connected to the V-shaped perforated water collection pipe, and a plurality of water intake holes are opened on the surface of the V-shaped perforated water collection pipe.
[0006] Optionally, a forward water splash wall is fixedly connected inside the horizontal flow sedimentation tank body and in front of the inverted V plate group.
[0007] Optionally, a bottom sludge scraper is installed inside the horizontal flow sedimentation tank body and below the inverted V plate group.
[0008] Optionally, the included angle between the two inverted V-shaped folding plates is set to 50° to 80°.
[0009] Optionally, communication holes are formed in the side fixing braces.
[0010] The present invention provides a device for improving the efficiency of the horizontal flow sedimentation separation process based on turbulent and laminar flows and shallow pond sedimentation, having the following beneficial effects: 1. The device for improving the efficiency of the horizontal flow sedimentation separation process based on turbulent and laminar flows and shallow pond sedimentation arranges n layers of "inverted V-shaped folding plates" along the water depth direction in the horizontal flow tank, so that the tank depth forms "n + 1" layers, becoming a multi-layer parallel horizontal flow sedimentation tank. According to the "shallow pond sedimentation theory", the sedimentation efficiency can be increased to "n + 1" times that of a conventional horizontal flow tank. Install one or more layers of "inverted V-shaped folding plates" near the bottom of the tank to change the hydraulic flow pattern at the bottom of the tank, reduce the bottom hydraulic turbulence, lower the Reynolds number, and make the bottom water tend to laminar flow, thereby suppressing the floating of bottom mud due to turbulence. Ensure the stability of the sedimentation effect. Keep the sedimented water quality from becoming turbid again.
[0011] 2. The device for improving the efficiency of the horizontal flow sedimentation separation process based on turbulent and laminar flows and shallow pond sedimentation is provided with a vertical V-shaped full-section integrated horizontal water collection device at the end of the horizontal flow sedimentation tank, which can achieve horizontal water collection without changing the horizontal flow state, is easy to stabilize the laminar flow, overcomes the problem of water turbidity caused by the turbulent flow and eddy current caused by the flow direction reversal in upward surface water collection, overcomes the problem that the surface finger-shaped groove water collection occupies a relatively large plane ratio, is installed against the end wall, does not occupy space, eliminates the obstacle of bottom sludge scraping, simplifies the installation workload, and facilitates the horizontal calibration of the overflow weir. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a schematic structural diagram of a single-layer inverted V plate group of the present invention; Figure 2 is a schematic structural diagram of a single-layer inverted V plate group of the present invention; Figure 3 is a schematic diagram of the application of a single-layer inverted V plate group in a sedimentation tank of the present invention; Figure 4 is a schematic structural diagram of a multi-layer (three-layer) inverted V plate group of the present invention; Figure 5 is a schematic structural diagram of a multi-layer (three-layer) inverted V plate group of the present invention; Figure 6 is a schematic diagram of the application of a multi-layer (three-layer) inverted V plate group in a sedimentation tank of the present invention; Figure 7 This is a schematic structural diagram of the vertical V-shaped full-section integrated horizontal water collection device of the present invention; Figure 8 This is a schematic structural diagram of the vertical V-shaped full-section integrated horizontal water collection device of the present invention; Figure 9 This is the control group of the present invention Figure 1 ; Figure 10 This is the control group of the present invention Figure 2 .
[0013] In the figure: 1. Inverted V-shaped folding plate; 2. Bottom fixed support; 3. Side fixed support; 4. Bottom sludge scraper; 5. Forward water splash wall; 6. V-shaped perforated water collection pipe; 7. Formed water collection tank; 8. Overflow weir; 9. Flexible card slot; 10. Horizontal flow sedimentation tank body. Specific implementation manners
[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
[0015] Embodiment 1 Please refer to Figures 1 to 3 , the present invention provides a technical solution: a device for improving the separation process efficiency of horizontal flow sedimentation based on turbulent and laminar flow and shallow pond sedimentation, including a bottom fixed support 2 fixedly connected to the bottom of an inverted V-shaped folding plate 1, a side fixed support 3 fixedly connected to the side of the inverted V-shaped folding plate 1. The bottom fixed support 2, the side fixed support 3 and the inverted V-shaped folding plate 1 form an inverted V plate group. The cross-section of the inverted V-shaped folding plate 1 is an inverted V shape. A flexible card slot 9 is opened at the edge of the plate surface of the inverted V-shaped folding plate 1. The flexible card slot 9 has flexibility. The side fixed support 3 is fixedly installed on the side wall of the horizontal flow sedimentation tank body 10. The inverted V-shaped folding plate 1 can be made of stainless steel, plastic or other materials with relatively stable forming.
[0016] A vertical V-shaped full-section integrated horizontal water collection device at the end of the horizontal flow sedimentation tank is installed inside the horizontal flow sedimentation tank body 10. The vertical V-shaped full-section integrated horizontal water collection device at the end of the horizontal flow sedimentation tank includes a formed water collection tank 7, an overflow weir 8 and a V-shaped perforated water collection pipe 6. A formed water collection tank 7 is arranged at the top of the overflow weir 8, and a V-shaped perforated water collection pipe 6 is fixedly connected to the bottom of the overflow weir 8. A plurality of intake holes are opened on the surface of the V-shaped perforated water collection pipe 6.
[0017] A forward water splash wall 5 is fixedly connected inside the horizontal flow sedimentation tank body 10 and in front of the inverted V plate group.
[0018] A bottom sludge scraper 4 is installed inside the horizontal flow sedimentation tank body 10 and below the inverted V plate group.
[0019] The included angle between two inverted V-shaped folding plates 1 is set to be 50°-80°.
[0020] Communication holes are provided on the side fixing braces 3. The bottom fixing brace 2 surrounds under the plate surface of the inverted V-shaped folding plate 1 through the communication holes on the side fixing braces 3, and under the action of the fastening device, the bottom fixing brace 2 is kept horizontal.
[0021] To sum up, when the device for improving the efficiency of the horizontal flow sedimentation separation process based on turbulent layer flow and shallow pond sedimentation is in use, through the inverted V-plate group, the water flow flows horizontally, and the particles sink on the folding plate surface and then slide down automatically, prompting specific particulate matters (sludge) to fall quickly to the bottom of the pond at a horizontal distance of, or enabling lighter particles to be intercepted at the bottom, and then collected and discharged out of the pond by the bottom sludge scraper. The water after sedimentation through the inverted V-plate group is collected into the formed water collection tank 7 through the V-shaped flower hole water collection pipe 6, flows to the collection channel through the overflow weir 8, and then flows to the filter tank.
[0022] Embodiment 2 Application of the multi-layer V-shaped folding plate group in the sedimentation tank: Please refer to Figures 4 to 8 , "n" layers of inverted V-shaped folding plates 1 are arranged in the horizontal sedimentation tank body 10 along the water depth direction, so that the pool depth forms "n + 1" layers, becoming a multi-layer parallel horizontal sedimentation tank. According to the "shallow pond sedimentation theory", the sedimentation efficiency can be increased to "n + 1" times that of a conventional horizontal flow pond. Prompting specific particulate matters (sludge) to fall quickly to the bottom of the pond at a horizontal distance of, or enabling lighter particles to be intercepted at the bottom, and then collected and discharged out of the pond by the bottom sludge scraper; The core calculation formula of the shallow pond sedimentation theory is based on the theory proposed by Hazen, and its basic formula is: ; Where: L is the length of the sedimentation tank; H is the depth of the sedimentation tank; υ is the horizontal flow velocity; u is the sedimentation velocity of the particles.
[0023] According to the shallow pond theory, when the horizontal flow velocity V and the length L of the sedimentation tank remain unchanged, the shallower the sedimentation tank (i.e., the smaller H), the smaller the minimum sedimentation velocity u of the suspended particles that can be removed. This means that a shallow pond can more effectively remove smaller or lighter particles.
[0024] Install one or more layers of "inverted V-shaped baffles 1" near the bottom of the pond to change the hydraulic flow pattern at the bottom of the pond, reduce the bottom hydraulic turbulence, lower the Reynolds number, and make the bottom water tend to laminar flow, thereby inhibiting the floating of bottom sediment due to turbulence. Ensure the stability of the sedimentation effect.
[0025] The Reynolds number is a dimensionless number characterizing the fluid flow condition, used to distinguish laminar flow and turbulent flow.
[0026] It is generally considered that when the Reynolds number is less than 2000, the fluid flow state is laminar flow; when the Reynolds number is greater than 4000, the fluid flow state is turbulent flow; when the Reynolds number is between 2000 and 4000, the fluid flow state is a transitional state from laminar flow to turbulent flow.
[0027]
[0028] Re - Reynolds number, υ - liquid flow velocity, R - hydraulic radius, u - liquid viscosity coefficient
[0029] R - hydraulic radius, A - cross-sectional area, x - wetted perimeter The larger the fluid cross-section of the horizontal flow pond, the larger the Reynolds number and the greater the degree of turbulence. Turbulence will cause the suspended particles in the liquid to be continuously redispersed into the fluid, unable to settle stably naturally or float up again after settling to the bottom. The fluid in turbulence has a higher kinetic energy and can continuously support the particulate matter to keep it in a suspended state. The flow field in turbulence is irregular, and the forces acting on the particulate matter are also irregular. The force in the reverse gravity direction more directly hinders the sedimentation of the particulate matter, seriously affecting the sedimentation effect.
[0030] If the distance between the lower layer of "inverted V-shaped baffles 1" and the pond bottom surface becomes one nth of the total depth of the pond, then the Reynolds number and the fluid turbulence at the bottom of the pond are reduced to one nth, and further, the situation of the bottom sediment being turbulently floated up is inhibited.
[0031] Such as Figures 9 - 10 As well as the control experiment data shown in the following table, after the raw water enters the sedimentation pond from the reaction pond, at 3 meters underwater in the middle section of the sedimentation pond, due to the existence of turbulence, the turbidity rises. After the improvement of this invention patent, the situation of the turbidity rising at 3 meters underwater has been significantly improved.
[0032] Control experiment turbidity data table The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.
Claims
1. An apparatus for improving the separation efficiency of the horizontal flow sedimentation process based on turbulent flow and shallow pond sedimentation, characterized in that: The bottom of the inverted V-shaped folding plate (1) is fixedly connected with a bottom fixed support (2), the side of the inverted V-shaped folding plate (1) is fixedly connected with a side fixed support (3), the bottom fixed support (2), the side fixed support (3) and the inverted V-shaped folding plate (1) form an inverted V-shaped plate group, the cross section of the inverted V-shaped folding plate (1) is inverted V-shaped, a ductile card slot (9) is arranged on the edge of the plate surface of the inverted V-shaped folding plate (1), the ductile card slot (9) has ductility, and the side fixed support (3) is fixedly installed on the side wall of the horizontal flow sedimentation tank body (10).
2. The device for improving the efficiency of the horizontal flow sedimentation separation process based on turbulent flow and shallow pond sedimentation according to claim 1, wherein: A vertical V-shaped full-section integrated horizontal water collection device at the end of the horizontal flow sedimentation tank is installed inside the horizontal flow sedimentation tank body (10). The vertical V-shaped full-section integrated horizontal water collection device at the end of the horizontal flow sedimentation tank includes a formed water collection trough (7), an overflow weir (8) and a V-shaped perforated water collection pipe (6). The formed water collection trough (7) is arranged at the top of the overflow weir (8), the bottom of the overflow weir (8) is fixedly connected with the V-shaped perforated water collection pipe (6), and a plurality of water collection holes are arranged on the surface of the V-shaped perforated water collection pipe (6).
3. The device for improving the separation process efficiency of horizontal flow sedimentation based on turbulent flow and shallow pond sedimentation according to claim 1, characterized in that: A forward water splash wall (5) is fixedly connected inside the horizontal flow sedimentation tank body (10) and in front of the inverted V-shaped plate group.
4. The device for improving the efficiency of the horizontal flow sedimentation separation process based on turbulent and laminar flow and shallow pond sedimentation according to claim 1, wherein: A bottom sludge scraper (4) is installed inside the horizontal flow sedimentation tank body (10) and below the inverted V-shaped plate group.
5. The device for improving the efficiency of the horizontal flow sedimentation separation process based on turbulent and laminar flow and shallow pond sedimentation according to claim 1, wherein: The included angle between the two inverted V-shaped folding plates (1) is set to be 50° to 80°.
6. The device for improving the separation process efficiency of horizontal flow sedimentation based on turbulent and laminar flow and shallow pond sedimentation according to claim 1, characterized in that: Communication holes are arranged on the side fixed supports (3).