Novel wastewater treatment tank

Abstract

The utility model discloses a novel wastewater treatment box, which belongs to the technical field of wastewater treatment equipment in polycrystalline silicon production, and comprises a box body and a wind collecting cover, the wind collecting cover is arranged above the box body and is detachably connected with the box body, and the box body is provided with a wastewater inlet and a liquid outlet. A coarse filter plate, an inclined plate coagulation area, an inclined tube sedimentation area and a fine filter plate are sequentially arranged between the wastewater inlet and the liquid outlet in the box body, the coarse filter plate is a 20-mesh filter plate, partition plates are arranged at the upper part and the lower part of the inclined plate coagulation area in a staggered manner, a plurality of inclined plates are arranged on the partition plates, a plurality of inclined tubes are arranged in the inclined tube sedimentation area, and the fine filter plate is arranged in the inclined tube sedimentation area. The inclined pipe is installed and arranged in the direction perpendicular to the movement direction of fluid and forms an included angle of 30-80 degrees with the horizontal plane, and the problems that in the prior art, a large number of impurities exist in waste water after a bell jar of a reduction furnace body is cleaned, the available space is limited after an original waste water pool is moved, the original waste water pool cannot achieve the expected treatment effect, and meanwhile related equipment is prone to faults and short in service life are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment equipment in polysilicon production, and particularly relates to a novel wastewater treatment tank. Background Art

[0002] With the rapid development of the polysilicon production field in recent years, the production process has become more mature, and large-scale production can be achieved. The price of crystalline silicon has gradually decreased. Production enterprises consider optimizing from aspects such as continuously optimizing the production process, improving production efficiency, shortening non-production time, reducing energy consumption, and improving product quality, so as to reduce production costs, ensure enterprise profits, and ultimately win the market.

[0003] For the cleaning of the bell cover of the reduction furnace body, the traditional treatment method of our company is: using the system described in the patent application with the application number "202021578118.X" and the name "A cleaning system for polysilicon reduction furnace" disclosed on April 30, 2021 to clean the bell cover of the reduction furnace body, and the wastewater after cleaning is sent to the wastewater tank on the first floor for centralized treatment. With the development of this industry and the improvement of production safety prevention awareness, the new design specification requires that equipment that may generate explosive gases be relocated to the explosion-proof area. Therefore, it is still necessary to further optimize the devices and equipment involved in the original wastewater treatment system such as the wastewater tank to meet production requirements.

[0004] During the equipment transformation process, in order to meet the equipment safety requirements and keep the equipment in a ventilated environment, it is considered to relocate the original wastewater treatment system such as the wastewater tank on the first floor to the second-floor mezzanine to coexist with other equipment. Specifically, when implemented, the following problems exist: the original wastewater tank needs to settle the collected wastewater. After the wastewater tank is moved to the second-floor mezzanine, the available space is very limited, and only the size of the original wastewater tank can be reduced. Due to insufficient settlement time, a large amount of impurities exist in the materials transported to the rear end, affecting the service life of components such as transfer pumps and filters, and at the same time, the expected wastewater treatment effect cannot be achieved. Summary of the Utility Model

[0005] The utility model aims to solve the problems in the prior art that there are a large amount of impurities in the wastewater after cleaning the bell cover of the reduction furnace body, the available space is limited after the original wastewater tank is relocated, the original wastewater tank cannot achieve the expected treatment effect, and at the same time, the equipment involved is prone to failure and has a short service life.

[0006] In order to achieve the above-mentioned invention purpose, the technical solution of the utility model is as follows:

[0007] A novel wastewater treatment tank, comprising a tank body and an air collecting hood. The air collecting hood is placed above the tank body and is detachably connected to the tank body. The tank body is provided with a wastewater inlet and a liquid discharge port. Inside the tank body, a coarse filter plate, an inclined plate coagulation zone, an inclined tube sedimentation zone, and a fine filter plate are sequentially arranged from the wastewater inlet to the liquid discharge port. The coarse filter plate is a filter plate with a filtration accuracy of 20 meshes and intercepts particles with a particle size of 915 μm. In the upper and lower parts of the inclined plate coagulation zone, partition plates are staggered, and a number of inclined plates are provided on the partition plates. A number of inclined tubes are provided in the inclined tube sedimentation zone. The inclined tubes are installed perpendicular to the movement direction of the fluid and form an angle of 30° - 80° with the horizontal plane.

[0008] Furthermore, both the coarse filter plate and the fine filter plate are metal woven square hole sieve filter plates. The filtration accuracy of the fine filter plate is 60 meshes, and the intercepted particle size is 301 μm.

[0009] Furthermore, the inclined plates on the partition plates are installed obliquely downward, and the inclined plates form an angle of 30° - 70° with the partition plates.

[0010] Furthermore, the partition plates include 3 - 5 pieces, the adjacent partition plates are spaced 40 - 70 cm apart, and the adjacent inclined plates are spaced 15 - 40 cm apart.

[0011] Furthermore, the inclined tubes are arranged in rows, and each row of inclined tubes is closely arranged.

[0012] Furthermore, the inclined tubes are made of fluoroplastics or stainless steel materials resistant to alkali corrosion.

[0013] Furthermore, a lifting ring is provided at the top of the air collecting hood, and the air collecting hood is lifted or lowered by the lifting ring and a manual hoist.

[0014] Furthermore, a gas discharge port is provided at the top of the air collecting hood, and the gas in the wastewater treatment tank is discharged outdoors through a hose and an exhaust fan.

[0015] The beneficial effects of the present utility model:

[0016] 1. In the present utility model, the novel wastewater treatment tank includes a tank body and an air collecting hood. The air collecting hood is placed above the tank body and is detachably connected to the tank body. A large amount of impurities and some flammable and explosive gases such as hydrogen exist in the wastewater received by the wastewater tank after cleaning and restoring the bell jar of the front-end cleaning reduction furnace. The air collecting hood can collect the combustible gas therein (mainly hydrogen that does not react with water), and centrally extract and discharge it to avoid the accumulation of hydrogen on the surface of the tank body, posing an explosion risk. Inside the tank body, a coarse filter plate, an inclined plate coagulation zone, an inclined tube sedimentation zone, and a fine filter plate are sequentially arranged from the wastewater inlet to the liquid discharge port. The wastewater is sequentially subjected to coarse filtration treatment, inclined plate coagulation treatment in the inclined plate coagulation zone, sedimentation treatment in the inclined tube sedimentation zone, and then fine filtration treatment to intercept most of the impurities and prevent the impurities in the wastewater from entering the subsequent transfer pump or post-treatment system, affecting the normal operation of the equipment. Partition plates are staggered in the upper and lower parts of the inclined plate coagulation zone. A number of inclined plates are provided on the partition plates. A number of inclined tubes are provided in the inclined tube sedimentation zone. The inclined tubes are installed perpendicular to the direction of fluid movement and form an angle of 30° - 80° with the horizontal plane, which can effectively increase the residence time of the wastewater in the wastewater treatment tank, increase the conveying path, further intercept the impurities in the wastewater, and achieve the purpose of sedimenting impurities and filtering / intercepting slag. When it is necessary to clean the tank body and structures / components such as the coarse filter plate, inclined plate coagulation zone, inclined tube sedimentation zone, and fine filter plate in the tank body, open the air collecting hood, and clean it from the top down into the tank body.

[0017] 2. In the present utility model, both the coarse filter plate and the fine filter plate are metal woven square hole sieve filter plates, which have the characteristics of easy cutting, corrosion resistance, and high porosity. The filtration accuracy of the fine filter plate is controlled at 60 meshes, intercepting particles with a diameter of 301 μm, which can intercept the impurities in the wastewater flow as much as possible and prevent the impurities from depositing in the transfer pump, causing scaling and corrosion and affecting the service life of equipment and pipelines such as the subsequent transfer pump.

[0018] 3. In the present utility model, the inclined plates on the partition plates are installed obliquely downward, and the inclined plates form an angle of 30° - 70° with the partition plates, which is beneficial to intercept the impurities in the wastewater.

[0019] 4. In the present utility model, the partition plates include 3 - 5 pieces, the adjacent partition plates are spaced 40 - 70 cm apart, and the adjacent inclined plates are spaced 15 - 40 cm apart, which can extend the conveying path of the wastewater in the inclined plate coagulation zone and also extend the residence time of the material flow in this area. The inclined plates can intercept most of the impurities.

[0020] 5. In the present utility model, the inclined tubes are arranged in rows, and each row of inclined tubes is closely arranged. The inclined tubes are made of fluoroplastics or stainless steel materials resistant to alkali corrosion, which is beneficial to intercept the impurities in the wastewater.

[0021] 6. In the present utility model, a lifting ring is provided at the top of the air collecting hood. The air collecting hood can be lifted or lowered through the lifting ring and a manual hoist. The air collecting hood can be lifted by using the lifting ring and the manual hoist, which is time-saving, labor-saving, and convenient for operation.

[0022] VII. In the present utility model, a gas discharge port is provided at the top of the air collecting hood. The gas discharge port discharges the gas in the wastewater treatment tank to the outside through a hose and an exhaust fan, avoiding the accumulation of combustible gases such as hydrogen at the top of the wastewater treatment tank, thus eliminating potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present utility model.

[0024] Figure 2 is a schematic structural diagram of an embodiment of the inclined plate coagulation zone.

[0025] Figure 3 is a schematic structural diagram of an embodiment of the inclined tube sedimentation zone.

[0026] Figure 4 is a schematic structural diagram of another embodiment of the present utility model.

[0027] Figure 5 is a schematic structural diagram of yet another embodiment of the present utility model.

[0028] Wherein, 1. Box body; 2. Air collecting hood; 3. Wastewater inlet; 4. Drainage port; 5. Coarse filter plate; 6. Inclined plate coagulation zone; 7. Inclined tube sedimentation zone; 8. Fine filter plate; 9. Lifting ring; 10. Chain block; 11. Gas discharge port; 12. Hose; 13. Exhaust fan; 14. Exhaust gas collection pipe; 15. Pressure sensor; 16. Delivery pump; 6.1. Partition board; 6.2. Inclined plate; 7.1. Inclined tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present utility model will be further described in detail below in conjunction with embodiments, but the embodiments of the present utility model are not limited thereto.

[0030] Embodiment 1

[0031] A new type of wastewater treatment tank belongs to the technical field of wastewater treatment equipment in polysilicon production, and includes a box body 1 and an air collecting hood 2. The air collecting hood 2 is placed above the box body 1 and is detachably connected to the box body 1. A wastewater inlet 3 and a drainage port 4 are provided on the box body 1. A coarse filter plate 5, an inclined plate coagulation zone 6, an inclined tube sedimentation zone 7 and a fine filter plate 8 are sequentially arranged in the box body 1 from the wastewater inlet 3 to the drainage port 4. The coarse filter plate 5 is a filter plate with a filtration accuracy of 20 meshes, which can intercept particles with a particle size of 915 μm or more. Partition boards 6.1 are staggered up and down in the inclined plate coagulation zone 6, and a number of inclined plates 6.2 are provided on the partition boards 6.1. A number of inclined tubes 7.1 are provided in the inclined tube sedimentation zone 7. The inclined tubes 7.1 are installed perpendicular to the direction of fluid movement and form an angle of 30° - 80° with the horizontal plane.

[0032] During use, refer toFigure 1 , 2 , the wastewater treatment tank collects the wastewater generated from cleaning and restoring the bell cover of the furnace body of the reduction furnace through the waste gas collection pipe. The wastewater contains impurities such as silicon powder, silicon dioxide, metal compounds, etc., and a small amount of hydrogen. After the wastewater enters the box body 1 from the wastewater inlet 3, it first passes through the coarse filter plate 5 to remove most of the large particle impurities, then passes through the inclined plate coagulation zone 6 to intercept part of the slag and suspended matter, then passes through the inclined tube sedimentation zone 7 to further sediment the material flow, and finally passes through the fine filter plate 8 to further remove small particle impurities and part of the suspended matter, and finally outputs a relatively clean material flow from the liquid discharge port 4.

[0033] Example 2

[0034] This example is a further optimization based on Example 1. The difference is that both the coarse filter plate 5 and the fine filter plate 8 are metal woven square hole sieve filter plates, which have the characteristics of easy cutting, corrosion resistance, and high porosity. The filtration accuracy of the fine filter plate is 60 mesh, and the intercepted particle size is 301μm.

[0035] Example 3

[0036] Compared with Examples 1-2, the difference in this example is that the inclined plate 6.2 on the partition plate 6.1 is installed obliquely downward, and the inclined plate 6.2 and the partition plate 6.1 are preferably at an angle of 30° to 70°.

[0037] Preferably, the partition plate 6.1 includes 3 to 5 pieces, and the distance between adjacent partition plates 6.1 is preferably 40 to 70 cm, and the distance between adjacent inclined plates 6.2 is preferably 15 to 40 cm. Refer to Figure 2 , Figure 2 In the inclined plate coagulation zone 6, there are three partition plates 6.1, and the adjacent inclined plates 6.2 are spaced 20 cm apart. The partition plates 6.1 with inclined plates 6.2 arranged in a staggered manner are beneficial to intercept the suspended matter in the material flow and achieve the purpose of clean wastewater.

[0038] Example 4

[0039] Compared with Examples 1-3, the difference in this example is that the inclined tubes 7.1 are arranged in rows. Refer to Figure 3 , and each row of inclined tubes 7.1 is closely arranged.

[0040] Preferably, the inclined tubes 7.1 are made of fluoroplastics or stainless steel materials resistant to alkali corrosion.

[0041] Example 5

[0042] Compared with Examples 1-4, the difference in this example is that a lifting ring 9 is provided at the top of the air collecting hood 2. Refer to Figure 5 , and the air collecting hood 2 is lifted or lowered through the lifting ring 9 and the chain hoist 10.

[0043] Example 6

[0044] Compared with Embodiments 1-5, this embodiment is different in that a gas discharge port 11 is provided at the top of the air collecting hood 2. Refer to Figure 4 , and the gas discharge port 11 discharges the gas in the wastewater treatment tank to the outside through a hose 12 and an exhaust fan 13.

[0045] Embodiment 7

[0046] To facilitate the public's understanding of the present utility model, this embodiment takes a new type of wastewater treatment tank newly designed by our company as an example for further illustration.

[0047] The new type of wastewater treatment tank specifically includes a tank body 1 and an air collecting hood 2. Refer to Figure 2 , 3 , 5. The air collecting hood 2 is placed above the tank body 1 and is detachably connected to the tank body 1. A wastewater inlet 3 and a liquid discharge port 4 are provided on the tank body 1. A coarse filter plate 5, an inclined plate coagulation zone 6, an inclined tube sedimentation zone 7 and a fine filter plate 8 are sequentially arranged in the tank body 1 from the wastewater inlet 3 to the liquid discharge port 4. The coarse filter plate 5 is a filter plate with a filtration accuracy of 20 meshes. Partition plates 6.1 are staggered up and down in the inclined plate coagulation zone 6, and a plurality of inclined plates 6.2 are provided on the partition plates 6.1. A plurality of inclined tubes 7.1 are provided in the inclined tube sedimentation zone 7. The inclined tubes 7.1 are installed perpendicular to the movement direction of the fluid and form an angle of 60° with the horizontal plane.

[0048] In this embodiment, both the coarse filter plate 5 and the fine filter plate 8 are metal woven square hole sieve filter plates. The filtration accuracy of the fine filter plate 8 is 60 meshes, intercepting particles with a particle size of 301 μm.

[0049] In this embodiment, the inclined plates 6.2 on the partition plates 6.1 are installed obliquely downward, and the inclined plates 6.2 form an angle of 55° with the partition plates 6.1.

[0050] In this embodiment, the partition plates 6.1 include 3 pieces, and the adjacent partition plates 6.1 are spaced 50 cm apart, and the adjacent inclined plates 6.2 are spaced 20 cm apart.

[0051] In this embodiment, the inclined tubes 7.1 are arranged in rows, and each row of inclined tubes 7.1 is closely arranged. The inclined tubes 7.1 are made of fluoroplastics or stainless steel materials resistant to alkali corrosion. The sewage entering the inclined tube sedimentation zone 7 from the front end travels upward along the inclined tubes 7.1 from the lower part, converges at the top and then flows out in the reverse direction of the inlet water, and then flows through the fine filter plate 8 for treatment.

[0052] In this embodiment, a lifting ring 9 is provided at the top of the air collecting hood 2, and the air collecting hood 2 is lifted or lowered through the lifting ring 9 and a manual hoist 10.

[0053] In this embodiment, a gas discharge port 11 is provided at the top of the air collecting hood 2, and the gas discharge port 11 discharges the gas in the wastewater treatment tank to the outside through a hose 12 and an exhaust fan 13.

[0054] During use, the waste water tank collects the waste water generated from cleaning the bell jar of the reduction furnace body through the waste gas collection pipe. The waste water contains impurities such as silicon powder, silicon dioxide, metal compounds, etc. and a small amount of hydrogen. After the waste water enters the box body 1 from the waste water inlet 3, it first passes through the coarse filter plate 5 to remove most of the large particle impurities, then passes through the inclined plate coagulation zone 6 to intercept part of the slag and suspended matter, then passes through the inclined tube sedimentation zone 7 to further sediment the material flow, and finally passes through the fine filter plate 8 to further remove small particle impurities and suspended matter, and finally obtains a relatively clean material. The material flow processed by the box body 1 is transported from the liquid discharge port 4 to the next process through a transfer pump. A pressure sensor is provided on the pipeline for monitoring the pressure in the pipeline. During the actual implementation process, the transfer pump can also be interlocked with the liquid level in the box body 1 to achieve automatic processing.

Claims

1. A new type of wastewater treatment tank, characterized by: The invention comprises a box body (1) and an air collecting hood (2), wherein the air collecting hood (2) is placed above the box body (1) and is detachably connected to the box body (1), wherein a wastewater inlet (3) and a liquid discharge port (4) are provided on the box body (1), wherein a coarse filter plate (5), an inclined plate coagulation zone (6), an inclined tube settling zone (7) and a fine filter plate (8) are sequentially arranged from the wastewater inlet (3) to the liquid discharge port (4) in the box body (1), wherein the coarse filter plate (5) is a filter plate with a filtration accuracy of 20 meshes, wherein partition plates (6.1) are alternately arranged at the upper and lower parts of the inclined plate coagulation zone (6), wherein a plurality of inclined plates (6.2) are arranged on the partition plates (6.1), and wherein the inclined tube settling zone (7) is provided with a plurality of inclined tubes (7.1), wherein the inclined tubes (7.1) are installed and arranged perpendicular to the movement direction of the fluid and form an angle of 30° to 80° with the horizontal plane.

2. A novel wastewater treatment tank according to claim 1, characterized in that: The coarse filter plate (5) and the fine filter plate (8) are both metal woven square hole sieve filter plates; the fine filter plate (8) has a filtration accuracy of 60 meshes and an interception particle size of 301 μm.

3. A novel wastewater treatment tank according to claim 1, characterized in that: The inclined plate (6.2) on the partition (6.1) is installed obliquely downward, and the inclined plate (6.2) and the partition (6.1) are arranged at an angle of 30 to 70 degrees.

4. A novel wastewater treatment tank according to claim 3, characterized in that: The partitions (6.1) include 3 to 5 pieces, the interval between adjacent partitions (6.1) is 40 to 70 cm, and the interval between adjacent inclined plates (6.2) is 15 to 40 cm.

5. A novel wastewater treatment tank according to claim 1, characterized in that: The inclined tubes (7.1) are arranged in rows, and the inclined tubes (7.1) in each row are closely arranged.

6. A novel wastewater treatment tank according to claim 5, characterized in that: The inclined tube (7.1) is made of fluoroplastic or alkali-corrosion-resistant stainless steel.

7. A novel wastewater treatment tank according to claim 1, characterized in that: The top of the wind collecting hood (2) is provided with a lifting ring (9), and the wind collecting hood (2) is lifted or lowered by means of the lifting ring (9) and a hand chain hoist (10).

8. A novel wastewater treatment tank according to claim 1, characterized in that: A gas discharge port (11) is provided on the top of the wind collecting hood (2), and the gas discharge port (11) discharges the gas in the wastewater treatment box to the outside through a hose (12) and an exhaust fan (13).

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