A vertical bowl-shaped laminated down-flow inclined plate sedimentation tank

Abstract

The application discloses a vertical bowl-shaped laminated downward flow inclined plate sedimentation tank, which comprises a center axis coinciding and a center cylinder and an outer cylinder arranged from inside to outside, a sludge storage hopper with a lower end smaller than an upper end and arranged in a taper shape is arranged at a lower end of the outer cylinder, a sludge discharge pipe for discharging sludge is arranged at a lower end of the sludge storage hopper, a water inlet pipe is arranged at the lower end of the outer cylinder, a water outlet pipe is arranged at an upper end of the center cylinder, at least two layers of bowl-shaped inclined plates are arranged at intervals outside the center cylinder, a sludge sinking hole is arranged at a lower end of the inclined plate, a water passing hole horizontally offset from the sludge sinking hole is arranged at a position close to the lower end of the inclined plate of the center cylinder, and the water passing hole is higher than the sludge sinking hole. The whole water collecting structure is simple in structure, easy to collect the sedimentation effluent, easy to separate the sludge and water, uniform in water distribution, high in space utilization rate and good in sedimentation effect.

Description

Technical Field

[0001] This invention belongs to the field of suspended solids sedimentation treatment technology in water supply and drainage, specifically relating to a vertical bowl-shaped stacked downward flow inclined plate sedimentation tank. Background Technology

[0002] In existing technologies, inclined plates are typically added to sedimentation tanks to enhance sedimentation efficiency. Based on the relative movement direction of sludge and water between the inclined plates, these can be categorized as co-current, counter-current, and transverse flow. The co-current flow structure is exemplified by the "Lammella" separator. Other similar structures exist, but all suffer from the following problems:

[0003] 1. The water collection area has a very complex structure. Because the mud flow and water flow are in the same direction during the sedimentation process, the co-current inclined plate sedimentation device requires a water collection channel at the end of the sedimentation to collect the clean water, which is then discharged through a return pipe. Various shapes of water collection areas exist, such as knife-shaped, integrated resistance type, and trapezoidal, but their structures are very complex, making them inconvenient to construct and assemble, and they are also expensive.

[0004] 2. Because a water collection area needs to be set up between the two inclined plates to collect the settled water, the distance between the two inclined plates cannot be too small, thus limiting the sedimentation area. Furthermore, adding a mud-sliding plate at the end of the sedimentation process increases the cost and installation difficulty.

[0005] 3. The holes in the water collection area are prone to clogging. The diameter of the holes in the water collection area is generally in the range of 4mm to 10mm. After the device has been running for a period of time, some holes are very easy to become clogged, which will prevent the device from working properly and seriously affect the sedimentation efficiency of the device.

[0006] 4. Uneven water distribution in the co-current inclined plate sedimentation tank. The liquid surface of the inclined plate is similar to that of a horizontal flow sedimentation tank with water flowing out along the flow path. Flocs enter the inclined plate along the flow path, with more entering at the end and less at the end. This results in a much higher sludge concentration at the end than at the end, leading to sludge accumulation on the inclined plate at the end. Summary of the Invention

[0007] This invention proposes a vertical bowl-shaped stacked downward flow inclined plate sedimentation tank with simple water collection structure, easy collection of sedimented water, easy separation of mud and water, uniform water distribution, high space utilization, and good sedimentation effect.

[0008] Therefore, the technical solution adopted by the present invention is as follows: a vertical bowl-shaped stacked downward flow inclined plate sedimentation tank, including a central cylinder and an outer cylinder with their central axes coincident and arranged from the inside to the outside. The lower end of the outer cylinder is provided with a sludge storage hopper arranged in a conical shape with a smaller bottom and a larger top. The lower end of the sludge storage hopper is provided with a sludge discharge pipe for discharging sludge. The lower end of the outer cylinder is provided with a water inlet pipe. The upper end of the central cylinder is provided with a water outlet pipe. Several layers of conical inclined plates are arranged at intervals outside the central cylinder. The vertical distance between adjacent inclined plates is 35mm. The lower end of the inclined plates is provided with sludge settling holes. The central cylinder is provided with water passage holes that are horizontally offset from the sludge settling holes at a position near the lower end of the inclined plates, and the water passage holes are higher than the sludge settling holes.

[0009] As a preferred embodiment of the above scheme, the lower end of the inclined plate is provided with sedimentation holes every 90°, and the water passage holes and sedimentation holes are horizontally offset at an angle of 45°.

[0010] Further preferably, the generatrix length of the inclined plate is 1000mm, and the angle between the generatrix of the inclined plate and the horizontal line is 60°.

[0011] In a further preferred embodiment, the lower end of the central cylinder is set inside the outer cylinder by at least three support legs, and the support legs are arranged corresponding to the sludge settling holes. The support legs are arranged to avoid the water inlet pipe. The upper end of the support leg is located below the lowest sludge settling hole, and the lower end of the support leg is located above the sludge storage hopper. The support leg is provided with a sludge channel to facilitate the transport of sludge. The upper end of the support leg is provided with an inlet to facilitate the entry of sludge and to communicate with the sludge channel. The lower end of the support leg is provided with a sludge outlet to facilitate the entry of sludge into the sludge storage hopper and to communicate with the sludge channel.

[0012] In a further preferred embodiment, the upper end of the central cylinder is closed and the lower end is set as an opening, and a truncated cone-shaped baffle is provided at the lower end of the central cylinder.

[0013] Preferably, the diameters of the central cylinder and the outer cylinder are calculated using the following formula:

[0014]

[0015]

[0016] in The diameter of the central cylinder, For water flow rate, The upward velocity of the water flow inside the central cylinder. The outer cylinder diameter, This refers to the inlet water flow rate. This refers to the upward velocity of the water flow inside the outer cylinder.

[0017] The beneficial effects of this invention are:

[0018] 1) Utilizing the principle of shallow pool sedimentation, multiple layers of inclined plates are vertically arranged in a cylinder, resulting in high sedimentation efficiency, small footprint, and compatibility with small integrated water purification equipment; co-current flow sedimentation is achieved through various sizes of conical inclined plates, ensuring uniform water distribution, virtually no dead water areas, and good hydraulic conditions. At the same time, the water collection area and inclined plate structure are simple, facilitating construction and installation.

[0019] 2) The raw water located between the central cylinder and the outer cylinder flows downwards through the inclined plate. Impurities in the water are settled on the inclined plate. The settled clear water flows into the central cylinder through the outlet hole and is finally discharged from the outlet pipe at the top of the central cylinder. The settled sludge falls sequentially to the next inclined plate through the sludge settling hole and finally flows into the sludge storage hopper to achieve sedimentation. The sludge is concentrated under the combined action of gravity and water flow thrust, resulting in a good concentration effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the present invention. Figure 2 .

[0022] Figure 3 This is a top view of the present invention.

[0023] Figure 4 This is a schematic diagram of the inner cylinder in this invention.

[0024] Attached reference numerals: 1. Central cylinder, 2. Outer cylinder, 3. Sludge hopper, 4. Sludge discharge pipe, 5. Water inlet pipe, 6. Water outlet pipe, 7. Inclined plate, 8. Sludge settling hole, 9. Water passage hole, 10. Support leg, 11. Sludge baffle. Detailed Implementation

[0025] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0026] like Figure 1-4 As shown, a vertical bowl-shaped stacked downward flow inclined plate sedimentation tank mainly consists of a central cylinder 1, an outer cylinder 2, a sludge storage hopper 3, a sludge discharge pipe 4, an inlet pipe 5, an outlet pipe 6, and an inclined plate 7. The central axes of the central cylinder 1 and the outer cylinder 2 coincide, and the central cylinder is located inside the outer cylinder. The sludge storage hopper 3 is located at the lower end of the outer cylinder 2, and the sludge storage hopper is set as a cone shape with a larger top and a smaller bottom.

[0027] To ensure that after the raw water enters, the sludge settles and the clear water is discharged, an inlet pipe 5 is installed at the lower end of the outer cylinder 2, and an outlet pipe 6 is installed at the upper end of the central cylinder 1. Simultaneously, several layers of conical inclined plates 7 are spaced apart outside the central cylinder 1, forming a bowl shape around it, with a vertical distance of 35mm between adjacent inclined plates 7. A sludge settling hole 8 is provided at the lower end of the inclined plate 7, and a water passage hole 9, horizontally offset from the sludge settling hole 8, is provided on the central cylinder 1 near the lower end of the inclined plate 7.

[0028] When the sedimentation device is working, the raw water located between the central cylinder and the outer cylinder will flow downwards through the inclined plate. Impurities in the water will settle on the inclined plate. The settled clear water will flow into the central cylinder through the water passage and finally flow out from the water outlet pipe at the top of the central cylinder. The settled sludge will fall sequentially to the next inclined plate through the sludge settling hole and finally flow into the sludge storage hopper to achieve sedimentation. The sludge is concentrated under the combined action of gravity and water flow thrust, resulting in a good concentration effect.

[0029] As a preferred embodiment, sedimentation holes 8 are provided at every 90° at the lower end of the inclined plate 7. Correspondingly, the water passage holes 9 and sedimentation holes 8 are horizontally offset at an angle of 45°. The water passage holes and sedimentation holes are arranged at an angle of 45°, and the position of the water passage holes is higher than that of the sedimentation holes, so as to ensure that the water flow direction and the mud flow direction do not interfere with each other, the clean and dirty water flows separately, and the effluent water quality is higher.

[0030] Preferably, the length of the inclined plate 7 is 1000mm, the angle between the generatrix of the inclined plate 7 and the horizontal line is 60°, and the vertical distance between adjacent inclined plates 7 is 35mm. Meanwhile, the diameters of the central cylinder and the outer cylinder are calculated using the following formula:

[0031]

[0032]

[0033] in The diameter of the central cylinder, For water flow rate, The upward velocity of the water flow inside the central cylinder. The outer cylinder diameter, This refers to the inlet water flow rate. This refers to the upward velocity of the water flow inside the outer cylinder.

[0034] To support the lower end of the central cylinder 1, at least three support legs 10 are installed inside the outer cylinder 2. Specifically, the upper end of each support leg 10 is located below the lowest settling hole 8, and the lower end of each support leg 10 is located above the sludge storage hopper 3. To reduce the dispersion of sludge due to water inflow as it settles downwards from the settling hole along the outer wall of the central cylinder, a sludge channel is provided inside each support leg 10 to facilitate sludge transport. An inlet connected to the sludge channel is located at the upper end of each support leg 10, and a sludge outlet connected to the sludge channel is located at the lower end of each support leg 10. The support legs 10 are positioned corresponding to the settling hole 8 and are positioned away from the water inlet pipe 5. The sludge channel can be an arc groove facing upwards on the support leg or a through hole inside the support leg. Preferably, the support legs are made of angle steel with a through hole at the lower end serving as the sludge outlet.

[0035] To further ensure the sedimentation effect, the upper end of the central cylinder 1 is closed and the lower end is set as an opening. At the same time, a settling baffle 11 with a larger upper end and a smaller lower end in the shape of a truncated cone is set at the lower end of the central cylinder 1. This not only prevents water in the inlet pipe from directly entering the central cylinder, but also facilitates the sludge in the central cylinder to enter the sludge storage hopper along the settling baffle.

Claims

1. A vertical bowl-shaped stacked downward flow inclined plate sedimentation tank, comprising a central cylinder (1) and an outer cylinder (2) with their central axes coincident and arranged from the inside to the outside, wherein a sludge storage hopper (3) with a smaller bottom and a larger top arranged in a conical shape is provided at the lower end of the outer cylinder (2), and a sludge discharge pipe (4) for discharging sludge is provided at the lower end of the sludge storage hopper (3), characterized in that: The lower end of the outer cylinder (2) is provided with a water inlet pipe (5), the upper end of the central cylinder (1) is provided with a water outlet pipe (6), and several layers of conical inclined plates (7) are provided at intervals outside the central cylinder (1). The vertical distance between adjacent inclined plates (7) is 35mm. The lower end of the inclined plate (7) is provided with a sedimentation hole (8). The central cylinder (1) is provided with a water passage hole (9) that is horizontally offset from the sedimentation hole (8) near the lower end of the inclined plate (7), and the water passage hole (9) is higher than the sedimentation hole (8).

2. The vertical bowl-shaped stacked downward flow inclined plate sedimentation tank according to claim 1, characterized in that: The lower end of the inclined plate (7) is provided with sedimentation holes (8) every 90°, and the water passage hole (9) is horizontally offset from the sedimentation hole (8) by an angle of 45°.

3. The vertical bowl-shaped stacked downward flow inclined plate sedimentation tank according to claim 1, characterized in that: The length of the generatrix of the inclined plate (7) is 1000mm, and the angle between the generatrix of the inclined plate (7) and the horizontal line is 60°.

4. The vertical bowl-shaped stacked downward flow inclined plate sedimentation tank according to claim 1, characterized in that: The lower end of the central cylinder (1) is set inside the outer cylinder (2) by at least three support legs (10), and the support legs (10) are correspondingly set with the sludge settling holes (8). The support legs (10) are set away from the water inlet pipe (5). The upper end of the support leg (10) is located below the lowest sludge settling hole (8), and the lower end of the support leg (10) is located above the sludge storage hopper (3). The support leg (10) is provided with a sludge channel to facilitate the transport of sludge. The upper end of the support leg (10) is provided with an inlet that facilitates the entry of sludge and is connected to the sludge channel. The lower end of the support leg (10) is provided with a sludge outlet that facilitates the entry of sludge into the sludge storage hopper and is connected to the sludge channel. (The sludge channel can be an arc groove set above the support leg or a through hole set inside the support leg).

5. The vertical bowl-shaped stacked downward flow inclined plate sedimentation tank according to claim 1, characterized in that: The upper end of the central cylinder (1) is closed and the lower end is set as an opening. A set of sediment baffles (11) with a larger upper end and a smaller lower end is provided at the lower end of the central cylinder (1).

6. The vertical bowl-shaped stacked downward flow inclined plate sedimentation tank according to claim 1, characterized in that: The diameters of the central cylinder (1) and the outer cylinder (2) are calculated using the following formula: ， ， in The diameter of the central cylinder, For water flow rate, The upward velocity of the water flow inside the central cylinder. The outer cylinder diameter, This refers to the inlet water flow rate. This refers to the upward velocity of the water flow inside the outer cylinder.

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