sand trap

Abstract

This invention relates to the field of water-saving irrigation technology, and provides a sedimentation tank, comprising: a first tank body with an inlet at its first end; multiple arc-shaped plates arranged sequentially and at intervals along the length of the first tank body, and near the second end of the first tank body, with a first gap between the bottom surface of each arc-shaped plate and the bottom surface of the first tank body; a second tank body arranged side by side with the first tank body; a portion of an overflow assembly disposed on the side wall of the first tank body, and the remaining portion of the overflow assembly disposed in the second tank body, so that the sediment-water passing through the arc-shaped plates is filtered by the overflow assembly and then enters the second tank body. The aforementioned sedimentation tank, by setting multiple arc-shaped plates in the first tank body, forms multiple sedimentation layers, reducing the sedimentation distance of the sediment, increasing the effective sedimentation area of ​​the first tank body, and improving sedimentation efficiency; furthermore, under the action of centripetal force, the flow velocity characteristics of the water between the arc-shaped plates are more conducive to sediment sedimentation, thereby achieving the interception of fine-particle sediment.

Description

Technical Field

[0001] This invention relates to the field of water-saving irrigation technology, and in particular to a sedimentation tank. Background Technology

[0002] In water-saving irrigation technology, the high sediment content of irrigation water can easily lead to problems such as clogging of sprinklers and wear of nozzles. Sedimentation basins are widely used for sediment settling in water containing fine particles of silt. Currently, the conventional sedimentation basin structure used in engineering practice is the straight-line sedimentation basin. The advantages of a straight-line sedimentation basin are its simple structure and reliable operation. However, it occupies a large area, has low sedimentation efficiency, and consumes a large amount of water for flushing. To improve the sedimentation efficiency of straight-line sedimentation basins and reduce their footprint, scholars both domestically and internationally have conducted various structural designs and parameter optimizations for them.

[0003] Adding various structures to a sedimentation tank can effectively improve the hydraulic conditions of the water flow and increase sedimentation efficiency. However, it is difficult to achieve the sedimentation requirements of a micro-irrigation system for fine-particle sediment. Therefore, it is crucial to provide a sedimentation tank that can both improve sedimentation efficiency and significantly reduce the sedimentation of fine-particle sediment. Summary of the Invention

[0004] This invention provides a sedimentation tank to address the shortcomings of existing sedimentation tanks in the prior art, which have poor sedimentation effects on fine-particle sediment.

[0005] This invention provides a sedimentation tank, comprising: a first tank body with an inlet at a first end; a plurality of arc-shaped plates, which are sequentially spaced along the length of the first tank body and located near a second end of the first tank body, with a first gap between the bottom surface of each arc-shaped plate and the bottom surface of the first tank body; a second tank body arranged side-by-side with the first tank body; and an overflow assembly, a portion of which is disposed on the side wall of the first tank body and the remaining portion of which is disposed in the second tank body, so that sediment water passing through the arc-shaped plates is filtered by the overflow assembly and then enters the second tank body.

[0006] According to the present invention, in a sedimentation tank, the arcuate protrusion of each of the arcuate plates faces the inlet.

[0007] According to the present invention, a sedimentation tank further includes a flow regulating plate disposed in the first tank body, along the flow direction of the sediment and water, the flow regulating plate being located upstream of the plurality of arc-shaped plates, and the flow regulating plate having a plurality of through holes.

[0008] According to a sedimentation tank provided by the present invention, the flow regulating plate is divided into a first region and a second region, the first region is located above the second region, and the diameter of the through hole in the first region is larger than the diameter of the through hole in the second region.

[0009] According to a sedimentation tank provided by the present invention, the density of through holes in the second region relative to the inlet is greater than the density of through holes in other locations of the second region.

[0010] According to the present invention, a sedimentation tank is provided in which the bottom of the flow regulating plate is provided with a serrated structure.

[0011] According to the present invention, a sedimentation tank further includes a baffle plate disposed between the flow regulating plate and the arc-shaped plate, wherein the bottom surface of the baffle plate and the bottom surface of the first tank body have a second gap, and the height of the second gap is greater than the height of the first gap.

[0012] According to a sedimentation tank provided by the present invention, the overflow assembly includes: an overflow weir disposed on the side wall of the first tank body, the overflow weir being located above the side wall of the second tank body; and a filter screen disposed obliquely in the second tank body, the first end of the filter screen being connected to the overflow weir, and the second end of the filter screen abutting against the inner wall of the second tank body.

[0013] The sedimentation tank provided by this invention forms multiple settling layers by setting multiple arc-shaped plates in the first tank body, which reduces the settling distance of sediment, increases the effective settling area of ​​the first tank body, and improves the settling efficiency. At the same time, setting arc-shaped plates can convert large eddies into small eddies between the plates, greatly reducing the eddy area and facilitating sediment settling. In addition, the arc-shaped plates have a large wetted perimeter, small hydraulic radius, and small Reynolds number, resulting in weaker turbulence in the water flow between the plates, which is conducive to sediment settling. Furthermore, under the action of centripetal force, the flow velocity characteristics of the water flow between the arc-shaped plates are more conducive to sediment settling, thereby achieving the interception of fine-particle sediment. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a top view of the sedimentation tank provided by the present invention;

[0016] Figure 2 yes Figure 1 The diagram shows the structure of the sedimentation tank.

[0017] Figure 3 yes Figure 1 The diagram shows the structure of the flow control plate.

[0018] Figure 4 This is a particle size distribution diagram of the test sediment.

[0019] Figure 5 It is a measurement section marking diagram;

[0020] Figure 6 These are structural diagrams of each sedimentation basin;

[0021] Figure 7 These are flow velocity contour maps and vector maps of each observation section;

[0022] Figure 8 These are sediment concentration curves at various measuring points;

[0023] Figure 9 This is a distribution diagram of sediment particle size distribution in each sedimentation basin;

[0024] Figure 10 This is a particle size distribution diagram of each cross section in the sedimentation tank provided in this embodiment of the invention;

[0025] Figure label:

[0026] 10: Arc-shaped plate; 20: Flow regulating plate; 21: Through hole; 22: Serrated structure; 30: Baffle; 40: Second pool body; 50: Overflow weir; 60: Inclined plate; 100: First pool body; 101: Inlet; 201: First area; 202: Second area. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0028] The terms "first" and "second" in the specification and claims of this invention may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0029] The following is combined with Figures 1-10 The sedimentation tank of the present invention is described.

[0030] like Figure 1 and Figure 2As shown, in an embodiment of the present invention, the sedimentation tank includes: a first tank body 100, a plurality of arc-shaped plates 10, a second tank body 40, and an overflow assembly. The first tank body 100 has an inlet 101 at its first end. The plurality of arc-shaped plates 10 are sequentially spaced along the length of the first tank body 100 and are located near the second end of the first tank body 100. A first gap exists between the bottom surface of each arc-shaped plate 10 and the bottom surface of the first tank body 100. The second tank body 40 is arranged side-by-side with the first tank body 100. A portion of the overflow assembly is disposed on the side wall of the first tank body 100, and the remaining portion is disposed within the second tank body 40, so that the sediment water passing through the arc-shaped plates 10 is filtered by the overflow assembly before entering the second tank body 40.

[0031] Specifically, the silty water enters the first pool 100 through the inlet 101. The silty water washes against the curved plate 10, and the silt slides down the wall of the curved plate 10 to the bottom of the first pool 100. After passing through the first gap between the first curved plate 10 and the first pool 100, it washes against the second curved plate 10, where it slides down the wall. Then, it flows through the first gap between the second curved plate 10 and the first pool 100 towards the second end of the first pool 100. During the flow of the silty water, it passes through multiple curved plates 10 sequentially for sedimentation, increasing the effective sedimentation area and improving sedimentation efficiency, thereby intercepting fine silt particles. After the silt particles are settled by the multiple curved plates 10, the silty water enters the overflow assembly. The overflow assembly filters out the fine silt particles before entering the second pool 40. In this embodiment, the second pool 40 is a clear water pool.

[0032] Furthermore, in this embodiment, multiple arc-shaped plates 10 are sequentially arranged along the length of the first pool body 100, forming multiple settling layers. Guided by shallow sediment theory, layering the first pool body 100 can reduce the sediment settling distance, increase the effective settling area of ​​the first pool body 100, and improve sediment settling efficiency. The arc-shaped plates 10 utilize this theory, not only significantly increasing the effective settling area and reducing the settling distance to allow sediment to slide down the plate walls to the bottom of the pool, but also improving hydraulic conditions, lowering the Reynolds number, and making the water flow more stable. Specifically, compared to an empty pool, the large eddies in the area where the arc-shaped plates 10 are arranged are transformed into small eddies between the plates, greatly reducing the eddy area and facilitating sediment settling. Furthermore, the combined lateral and vertical velocities between the plates are relatively small, ranging from 0 to 0.005 m / s, and these velocities follow the curvature of the arc-shaped plates 10. This phenomenon makes it easier for sediment to settle on the walls of the arc-shaped plates 10. In particular, the combined velocity direction in the upper half of the space between the plates tends downwards, which accelerates sediment settling. This is because the arc-shaped plates 10 have a large wetted perimeter, a small hydraulic radius, and a low Reynolds number, resulting in weaker turbulence between the plates, which further aids sediment settling. Moreover, under the influence of centripetal force, the flow velocity characteristics between the arc-shaped plates 10 are even more conducive to sediment settling, thus achieving the interception of fine-grained sediment.

[0033] Optionally, in an embodiment of the present invention, the first pool 100 has a length of 10m, a width of 1.5m, a design water depth of 1.7m, a working water depth of 1.5m, and a bottom slope designed as a flat slope.

[0034] Furthermore, a sand-discharging funnel is provided at the second end of the first pool 100, which can periodically flush the sediment that settles in the first pool 100.

[0035] The sedimentation tank provided in this embodiment of the invention forms multiple sedimentation layers by setting multiple arc-shaped plates in the first tank body, which reduces the sedimentation distance of sediment, increases the effective sedimentation area of ​​the first tank body, and improves sedimentation efficiency. At the same time, setting arc-shaped plates can convert large eddies into small eddies between the plates, greatly reducing the eddy area and facilitating sedimentation. In addition, the arc-shaped plates have a large wetted perimeter, small hydraulic radius, and small Reynolds number, resulting in weaker turbulence in the water flow between the plates, which is conducive to sedimentation. Furthermore, under the action of centripetal force, the flow velocity characteristics of the water flow between the arc-shaped plates are more conducive to sedimentation, thereby achieving the interception of fine-particle sediment.

[0036] like Figure 2 As shown, in an embodiment of the present invention, the arcuate protrusion of each arcuate plate 10 faces the inlet 101.

[0037] Specifically, in this embodiment, the arc of the arc-shaped plate 10 is 120°, the radius is 0.4m, and the distance between the bottom surface of the arc-shaped plate 10 and the bottom surface of the first pool body 100 is 0.5m. The arc-shaped plate 10 increases the effective settling area of ​​the sedimentation tank by 0.8, calculated as follows:

[0038]

[0039] A b =nWL b

[0040] In the formula: Δ represents the proportion of increased effective settlement area; A b A0 is the horizontal projected area of ​​the arc-shaped plate; n is the surface area of ​​the first pool; W is the number of arc-shaped plates; L is the width of the arc-shaped plate; and L is the horizontal projected length of the arc-shaped plate.

[0041] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the sedimentation tank further includes a flow regulating plate 20, which is disposed within the first tank body 100. Along the flow direction of the sediment water, the flow regulating plate 20 is located upstream of multiple arc-shaped plates 10, and the flow regulating plate 20 is provided with multiple through holes 21.

[0042] Specifically, the silt water enters the first pool 100 through the inlet 101. The silt water enters the space between the regulating plate 20 and the arc plate 10 through multiple through holes 21 on the regulating plate 20. The silt water washes over multiple arc plates 10, and the silt slides down the wall of the arc plate 10 to settle. After multiple sedimentation, the silt water enters the second pool 40 after being filtered by the overflow component.

[0043] Furthermore, such as Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the sedimentation tank further includes a baffle 30, which is disposed between the flow regulating plate 20 and the arc plate 10. There is a second gap between the bottom surface of the baffle 30 and the bottom surface of the first tank body 100, and the height of the second gap is greater than the height of the first gap.

[0044] Specifically, in this embodiment, the height of the second gap between the baffle 30 and the first pool 100 is 0.35m. The mud and sand can enter the arc plate 10 arrangement area through the second gap and then settle in the arc plate 10 arrangement area.

[0045] like Figure 1As shown, in an embodiment of the present invention, the overflow assembly includes an overflow weir 50 and a filter screen. The overflow weir 50 is disposed on the side wall of the first pool body 100 and is located above the side wall of the second pool body 40. The filter screen is obliquely disposed within the second pool body 40, with a first end connected to the overflow weir 50 and a second end abutting against the inner wall of the second pool body 40.

[0046] Specifically, an overflow weir 50 is provided on the side wall adjacent to the first pool 100 and the second pool 40. Sediment in the sediment-laden water settles in the first pool 100, while the sediment-laden water is located above the sediment. The sediment-laden water flows through the overflow weir 50 to the filter screen. In this embodiment, the filter screen is inclined, thereby filtering the sediment from the sediment-laden water. The filtered clean water then enters the second pool 40. Optionally, in this embodiment of the invention, the width of the overflow weir 50 is 2m.

[0047] like Figure 3 As shown, in an embodiment of the present invention, the flow control plate 20 is divided into a first region 201 and a second region 202. The first region 201 is located above the second region 202, and the diameter of the through hole 21 in the first region 201 is larger than the diameter of the through hole 21 in the second region 202.

[0048] Specifically, the through holes 21 in the first region 201 above the flow regulating plate 20 have a large diameter and stronger flow capacity. The water flow through the large diameter holes in the first region 201 is relatively large, and the flow velocity of the mud and sand at the bottom of the first pool 100 is greater than that at the top, and the pressure at the bottom is smaller. As a result, the water in the top moves to the bottom. This phenomenon can cause large particles of mud and sand to settle at the front end of the flow regulating plate 20, thereby filtering the large particles of mud and sand.

[0049] Furthermore, in an embodiment of the present invention, the density of through holes 21 in the second region 202 is greater than the density of through holes 21 in the first region 201. At the position opposite the inlet 101 in the second region 202, the density of through holes 21 is greater than the density of through holes 21 at other positions in the second region 202. The diameter of the central through hole 21 in the first region 201 is smaller than the diameter of the through holes 21 on both sides of the first region 201. The bottom of the flow regulating plate 20 is provided with a serrated structure 22.

[0050] Specifically, to make the flow velocity distribution at the bottom more uniform, the density of the through holes 21 opposite to the inlet 101 is increased. Furthermore, a serrated structure 22 is provided at the bottom of the flow regulating plate 20 to prevent a large amount of silt from accumulating in front of the flow regulating plate 20.

[0051] During the experiment, the inflow rate was set at 60 m³ / s. 3 / h, the concentration of imported sediment is 3-3.5 kg / m³ 3 The particle size distribution of the sediment used in the experiment was as follows: Figure 4As shown. To observe the water flow characteristics and sediment concentration distribution within the first pool 100, the flow velocity and sediment concentration were measured. An acoustic Doppler current meter was used to measure the lateral and vertical flow velocities at each measuring point. Eighteen measurement sections were set up, as shown... Figure 5 As shown in the figure. The measurement cross-sections were set up with 35 measurement points at longitudinal points Y=20cm, Y=40cm, Y=75cm, Y=110cm, and Y=130cm, and depth points Z=10cm, Z=30cm, Z=50cm, Z=70cm, Z=90cm, Z=110cm, and Z=130cm. Sediment concentration was measured using the hydrostatic bottle method, employing a conical flask, a precision electronic balance, and a platform balance. Because the sediment concentration distribution was similar across the cross-sections, this experiment only measured the central axis at Y=75cm. Measurement points were located at Z=20cm, Z=50cm, Z=80cm, Z=110cm, and Z=140cm. The sediment concentration calculation formula is shown below.

[0052]

[0053] In the formula: C s ρ is the sediment concentration; ρ1 is the sediment density (2650 kg / m³). 3 ); ρ0 is the density of distilled water (1000 kg / m³). 3 m1 is the mass of the specific gravity bottle with mud and sand added; m2 is the mass of the specific gravity bottle with distilled water added.

[0054] like Figure 6 As shown, Figure 6 (a) is a sedimentation tank in the prior art without an arc-shaped plate; (b) is a sedimentation tank in the prior art with an inclined plate 60; (c) is a sedimentation tank provided in the embodiment of the present invention with an arc-shaped plate 10. The sedimentation effects of the above three types of sedimentation tanks are compared under the condition that the structure and setting position of the flow regulating plate 20 and the baffle 30 are the same.

[0055] like Figure 7 As shown, by calculating the resultant velocity and vector angle of the transverse and vertical flow velocities at each measuring point, flow velocity contour maps and vector maps are drawn. Specifically, Figure 7 (a) shows Figure 6 (a) shows the flow velocity contour maps and vector maps of each observation section of the sedimentation basin without the curved plate. Figure 7 (b) shows what Figure 6 (b) shows the flow velocity contour maps and vector maps of each observation section of the sedimentation basin equipped with inclined plates. Figure 7 (c) shows what Figure 6 (c) shows the flow velocity contour maps and vector maps of each observation section of the sedimentation basin equipped with arc-shaped plates. Figure 7It can be seen that the distribution of the resultant velocity direction at the X=20cm and X=60cm sections in front of the flow regulating plate 20 is relatively chaotic and irregular in magnitude. This is because the water flow velocity and turbulent kinetic energy are relatively high near the inlet 101, resulting in eddy currents. Especially at the Y=20cm and Y=130cm sections, where the sections are directly opposite the inlet, the flow velocity is relatively high at Z=0-50cm. This causes the sediment deposited at the bottom to be washed up and resuspended, reducing the sedimentation efficiency of the sedimentation tank. At the X=100cm section in front of the flow regulating plate, the resultant velocity direction is mainly upward. This is because the aperture of the through hole 21 in the first region 201 of the flow regulating plate 20 is large, resulting in a stronger flow capacity. At X=120cm after the flow regulating plate 20, the resultant velocity direction is predominantly downward and the flow velocity is more uniform. This is because the water flow rate through the large-diameter upper orifice is larger, and the flow velocity at the bottom of the first pool 100 is greater than that at the top, resulting in lower pressure at the bottom. Consequently, the water in the upper part moves towards the bottom, causing large particles of sediment to settle at the front end of the flow regulating plate 20. Between the flow regulating plate 20 and the baffle 30, the velocity distribution at each cross-section is similar, with the resultant velocity direction pointing downstream. The vertical velocity is smaller and the velocity distribution is more uniform, ranging from 0.003 to 0.01 m / s. This indicates that the flow regulating plate 20 has a significant effect on regulating the water flow, and this phenomenon allows sediment to settle evenly and stably in this section. The lower flow velocity at the bottom than at the top in this section conforms to a clear water flow pattern. In the section in front of baffle 30, the water flows from the second gap between baffle 30 and the bottom of the pool to the area where the arc plate 10 is arranged. The direction of the combined velocity of the water flow in the section in front of baffle 30 is mainly downward. The flow velocity at the bottom of the section behind baffle 30 is larger. This area will cause sediment to be carried into the area where the arc plate is arranged, which will have a certain impact on the sedimentation efficiency.

[0056] Figure 6 The sedimentation tank shown in (c) is compared to Figure 6 In the sedimentation tank of (a), the large eddies are transformed into small eddies between the plates, greatly reducing the eddy area and facilitating sediment settling; furthermore, the combined lateral and vertical velocities between the plates are relatively small, ranging from 0 to 0.005 m / s. To study the influence of the inclined plate structure on the water flow velocity, comparisons were made... Figure 6 (c) and Figure 6 (b) shows a sedimentation tank. Comparing different structures with the same proportion of increased effective sedimentation area, it was found that the flow velocity between the curved plate 10 is smaller than that between the inclined plate 60. In particular, the direction of the combined velocity in the upper half of the plate is downward. This phenomenon accelerates the sedimentation of sediment. This is because, under the same proportion of increased effective sedimentation area, the curved plate 10 has a larger wetted perimeter, a smaller hydraulic radius, a smaller Reynolds number, and weaker turbulence between the plates, which is conducive to sedimentation. Furthermore, under the action of centripetal force, the flow velocity characteristics between the curved plate 10 are more conducive to sedimentation.

[0057] The sediment concentration distribution in the sedimentation tank provided by this invention was analyzed at a measurement cross section with Y = 75cm. For example... Figure 8 As shown, Figure 8 (a) is Figure 6 (a) shows the sediment concentration distribution at each measuring point in the sedimentation tank. Figure 8 (b) is Figure 6 (b) shows the sediment concentration distribution at each measuring point in the sedimentation tank. Figure 8 (c) is Figure 6 (c) shows the sediment concentration distribution at various measuring points in the sedimentation tank. Before the flow regulating plate 20, the sediment concentration is relatively high at the bottom of the first tank body 100 at Z=20cm and Z=50cm, ranging from 6.5-9 kg / m³. 3 In the first pool section, at a depth of 80cm (Z=80cm), the sediment concentration decreases slightly from the bottom, with a sediment concentration of 4-6kg / m³. 3 Between these times, the sediment concentration on the surface layer of the first pool is 3-4 kg / m³. 3 The higher sediment concentration at the bottom and middle is due to the large amount of sediment settling at the bottom of the first pool 100 over a long period of operation. The high flow velocity at the inlet 101 washes up the sediment deposited at the bottom, causing it to spread upwards in a turbulent manner. Between the flow regulating plate 20 and the baffle 30, the sediment concentration decreases, but at different rates. At X = 140-240 cm, the sediment concentration decreases rapidly, while at X = 240-600 cm, the decrease is slower. This is because in the earlier section, larger particles settle quickly to the bottom, while smaller particles settle at lower flow velocities, and the turbulence is insufficient to settle the sediment. After the baffle 30, at X = 620 cm, an increasing sediment concentration is observed. This is because the high flow velocity of the water entering the arc-shaped plate 10 arrangement area from the second gap between the baffle 30 and the bottom of the pool washes up the sediment at the bottom.

[0058] Compare Figure 6 In each sedimentation basin in (a), (b), and (c), the sediment concentration decreased more rapidly with the curved plate 10 compared to the inclined plate 60 and the empty basin. Furthermore, the sediment concentration at the surface of the overflow weir 50 in all three sedimentation basins ranged from 1.33 to 1.55 kg / m³. 3 0.7-0.85 kg / m 3 and 0.5-0.61 kg / m 3 This indicates that the arc-shaped plate 10 structure sedimentation tank has a more significant effect on sediment settling.

[0059] To more clearly demonstrate the sediment settling effect of various sedimentation basin structures, water samples were taken from the surface layer at X = 800, 840, 880, 920, and 960 cm at the outlet of the overflow weir. The water sample coordinates were (800, 10, 150), (840, 10, 150), (880, 10, 150), (920, 10, 150), and (960, 10, 150). The sediment removal efficiency was calculated as shown in Table 1 below. Figure 6 The sedimentation efficiencies of the sedimentation tanks in (a), (b), and (c) are 55.43%, 75.83%, and 82.45%, respectively. The calculation formulas are shown below:

[0060]

[0061] In the formula: η s For sediment removal efficiency; C s1 C represents the concentration of sediment in the water source. S2 The sediment concentration at the water intake location.

[0062] Table 1 Sediment Removal Rate at Water Intake Points

[0063]

[0064] Sediment samples were taken from the bottom of the sedimentation basins with three different structures at a cross-section of X = 9.0m. The particle size distribution of the sediment in each sedimentation basin was plotted as follows: Figure 9 As shown. For the three types of sedimentation tanks, Figure 6 (c) shows the sedimentation tank with the arc-shaped plate 10 structure, which has the smallest particle size of sediment. Figure 6 (b) shows the second best inclined plate 60 structure sedimentation tank. Figure 6 (a) shows an empty sedimentation tank with relatively large sediment particles. Figure 6 The median particle sizes of the sediment in the three sedimentation tanks (a), (b), and (c) are 161.426 μm, 63.267 μm, and 45.978 μm, respectively; the mass percentages of sediment particles smaller than 0.05 mm are 19.81%, 46.03%, and 54.28%, respectively; and the mass percentages of sediment particles with a diameter between 0.1 mm and 1 mm are 57.15%, 34.25%, and 25.98%, respectively. The above analysis demonstrates that the sedimentation tank with the arc-shaped plate 10 structure can facilitate the settling of finer-sized sediment particles compared to the other two structures. Furthermore, the sedimentation tank provided in this embodiment of the invention has a significant promoting effect on sediment settling.

[0065] For the sedimentation tank provided in this embodiment of the invention, sediment samples were taken at four cross-sections: X = 0.5m, 1.5m, 6.0m, and 9m. The particle size distribution diagrams for each cross-section are as follows: Figure 10As shown, at cross-sections of X = 0.5m, 1.5m, and 6.0m, the mass percentages of sediment particles larger than 0.5mm were 44.08%, 28.25%, and 18.25%, respectively. This indicates that sediment particles larger than 0.5mm in the sediment-laden water partially settle after passing through the flow regulating plate 20, and then most of them settle to the bottom of the pool between the flow regulating plate 20 and the baffle 30. The mass percentages of sediment particles with a diameter between 0.01mm and 1mm were 99.63%, 98.51%, 97.32%, and 79.91%, respectively. This indicates that larger sediment particles flow downstream to the arc-shaped plate 10 arrangement area after passing through the baffle 30. The arc-shaped plate 10 structure can intercept most of the sediment, further proving that the sedimentation tank provided in this embodiment of the invention has a significant promoting effect on sediment settling.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sedimentation tank, characterized in that, include: The first pool body has a water inlet at its first end; Multiple arc-shaped plates are arranged sequentially and spaced apart along the length of the first pool body and close to the second end of the first pool body. A first gap exists between the bottom surface of each arc-shaped plate and the bottom surface of the first pool body. The second pool is arranged side by side with the first pool. An overflow assembly is provided, with a portion of the overflow assembly disposed on the side wall of the first pool body and the remaining portion of the overflow assembly disposed in the second pool body, so that the mud and sand water passing through the arc plate enters the second pool body after being filtered by the overflow assembly. A flow regulating plate is installed in the first pool body, along the flow direction of the silt and water. The flow regulating plate is located upstream of the plurality of arc-shaped plates, and the flow regulating plate is provided with a plurality of through holes. A baffle is disposed between the flow regulating plate and the arc-shaped plate. There is a second gap between the bottom surface of the baffle and the bottom surface of the first pool body. The height of the second gap is greater than the height of the first gap.

2. The sedimentation tank according to claim 1, characterized in that, The arc-shaped protrusion of each of the arc plates faces the water inlet.

3. The sedimentation tank according to claim 1, characterized in that, The flow control plate is divided into a first region and a second region. The first region is located above the second region, and the diameter of the through hole in the first region is larger than the diameter of the through hole in the second region.

4. The sedimentation tank according to claim 3, characterized in that, The density of through holes in the second region relative to the water inlet is greater than the density of through holes in other locations within the second region.

5. The sedimentation tank according to claim 1, characterized in that, The bottom of the flow control plate has a serrated structure.

6. The sedimentation tank according to claim 1, characterized in that, The overflow component includes: An overflow weir is provided on the side wall of the first pool body, and the overflow weir is located above the side wall of the second pool body; A filter screen is inclinedly disposed in the second pool body, with its first end connected to the overflow weir and its second end abutting against the inner wall of the second pool body.

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