Mechanical accelerated clarifier dosing apparatus

Abstract

The application provides a mechanical acceleration clarifying tank dosing device and a dosing process, relates to the technical field of water hardness removal and reuse, and comprises a vertical driving shaft which is rotatably connected to the center of the power assembly; the vertical driving shaft is sequentially and rotatably connected with a water guide cone cover, an axial flow pipeline, a mixing tank and a positioning ring from top to bottom; a first lifting impeller is arranged on the part of the vertical driving shaft which is located in the top opening of the axial flow pipeline; a second lifting impeller is arranged on the part of the vertical driving shaft which is located in the top opening of the positioning ring; and a rotating suction member is welded on the part of the vertical driving shaft which is located in the mixing tank. The fluid circulation channel and the formed cyclone can realize multiple and multiple sufficient and thorough mixing of NaOH and the water by optimizing the fluid flow form and path, the mixing effect is more outstanding, the traditional mechanical rotating stirring part can be replaced, energy saving and emission reduction are facilitated, and economic benefits are improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater hardening and reuse technology, and in particular to a chemical dosing device for mechanically accelerated clarification tanks. Background Technology

[0002] In the past, power plant boiler feedwater sources were mostly groundwater or municipal tap water. However, with the increasing scarcity of water resources in my country and the issuance of a number of environmental protection policies and requirements by the state in recent years, power plants are strongly encouraged to use municipal wastewater treatment plant wastewater (hereinafter referred to as reclaimed water) and power plant circulating wastewater (hereinafter referred to as circulating wastewater) as boiler feedwater sources. This reduces the use of groundwater while realizing the recycling and reuse of reclaimed water or circulating wastewater. However, the above two types of water have high hardness and need to be softened to remove hardness before entering the boiler feedwater membrane treatment and desalination system.

[0003] Mechanically accelerated clarifiers, also known as mechanically accelerated clarifiers, are mainly composed of primary and secondary reaction chambers and a separation chamber. They are structures that integrate coagulation, reaction, and sedimentation in a single tank through mechanical agitation. Mechanically accelerated clarifiers are highly adaptable to changes in water volume and quality, offering stable treatment results and high efficiency. They can remove suspended solids and also function as a softening device to remove hardness, making them a common pretreatment process in membrane demineralization systems for power plant wastewater or circulating sewage.

[0004] As a pretreatment process for softened water, the mechanical treatment tank usually requires the addition of NaOH (or a combination of lime slurry and soda ash), polyaluminum chloride (hereinafter referred to as PAC), and polypropylene amine (hereinafter referred to as PAM) to remove hardness from the water. The existing process flow is as follows: mixing tank (adding NaOH) → water pump → mechanical treatment tank (adding PAC and PAM) → clear water tank (adding acid to adjust pH) → membrane treatment demineralized water treatment system.

[0005] Existing dosing equipment:

[0006] ① The method of mixing the added NaOH with water is mostly the traditional mechanical rotary stirring. The mechanical rotary stirring mechanism can only carry out a single stirring of the fluid flowing through it for a relatively short time, and the stirring and mixing effect is difficult to achieve a more ideal level.

[0007] ② Mechanical stirring components need to rotate at a relatively high speed in water to achieve a relatively qualified stirring and mixing effect. However, the rotational resistance that needs to be overcome is relatively large, which consumes a lot of electrical energy or other forms of energy. This is not conducive to energy conservation and emission reduction, and to improving the economic efficiency of power plants and factories. Summary of the Invention

[0008] In view of this, the present invention provides a mechanically accelerated clarification tank dosing device to solve the problem that the means of mixing the added NaOH with the water body is mostly traditional mechanical rotary stirring. Mechanical rotary stirring mechanism can only perform single stirring of the fluid flowing through it for a relatively short time, and the stirring and mixing effect is difficult to achieve a more ideal level.

[0009] The technical solution proposed in this invention is: a mechanically accelerated clarification tank dosing device, specifically including: a clarification tank and a power component; the clarification tank is composed of a top annular water tank, a clarification cone welded to the bottom of the annular water tank, and a flocculation cone welded to the bottom of the clarification cone, wherein a power component is installed at the center of the top plate of the annular water tank;

[0010] A mixing tank is welded and hoisted at the bottom center of the top plate of the annular water tank, and an axial flow pipe is welded through the middle of the bottom plate of the mixing tank. A mixing vessel is welded and hoisted at the bottom of the axial flow pipe.

[0011] The mixing tank has an arched cross-section, and the interior of its circumferential sidewall is hollow. A spray groove is formed around the inner layer of the circumferential sidewall. Both the top and bottom ends of the mixing tank are open. A circulating conical cover is welded and suspended on the bottom opening of the mixing tank. A positioning ring protruding upward is welded on the bottom opening of the circulating conical cover, and a water suction groove is formed around the bottom of the positioning ring. A NaOH feed pipe is welded to the outer layer of the circumferential sidewall of the mixing tank.

[0012] A vertical drive shaft is axially mounted at the center of the power assembly. From top to bottom, the vertical drive shaft is rotatably connected to a water guide cone, an axial flow pipe, a mixing tank, and a positioning ring. A first lifting impeller is mounted on the portion of the vertical drive shaft located in the opening at the top of the axial flow pipe, and a second lifting impeller is mounted on the portion of the vertical drive shaft located in the opening at the top of the positioning ring. A rotating suction component is welded and fitted onto the portion of the vertical drive shaft located in the mixing tank. The rotating suction component has a rhomboid cross-section, consisting of two symmetrically welded umbrella-shaped covers, with a rotating ring welded to the bottom opening of the lower umbrella-shaped cover. This rotating ring rotatably engages with the positioning ring. An annular connecting plate is welded between the upper and lower umbrella-shaped covers. The annular connecting plate has an arc-shaped cross-section and a ring of water outlets is circumferentially formed on it.

[0013] Furthermore,

[0014] An annular water distribution cavity with an arc-shaped cross-section is formed between the annular connecting plate and the inner layer of the circumferential side wall of the mixing tank. An upward flow lifting channel is formed between the upper half of the water distribution cavity and the axial flow pipe, and a downward flow circulation channel is formed between the lower half of the water distribution cavity and the bottom side of the circulation cone cover and the positioning ring.

[0015] Furthermore,

[0016] A triangular scraper groove is welded around the inner circumference of the annular connecting plate, with the water inlet of the triangular scraper groove facing the inside of the rotating suction component and the water outlet connected to the water outlet.

[0017] Furthermore,

[0018] The mixing tank is circular in shape and has a U-shaped cross-section. A water guide cone shroud concentric with the mixing tank is welded and hoisted to the bottom of the top plate of the annular water tank.

[0019] A conveying port is provided around the top of the circumferential sidewall of the mixing tank, and the part where the top of the circumferential sidewall of the mixing tank connects to the annular water tank, the part where the circumferential sidewall of the mixing tank connects to the bottom plate, and the part where the bottom plate of the mixing tank connects to the axial flow pipe all have a rounded transition structure.

[0020] The mixing chamber is formed between the outer circumferential wall of the mixing tank, the axial flow pipe and the water guide cone for water circulation and rotation.

[0021] Furthermore,

[0022] A water-proof ring is welded and hoisted to the bottom of the top plate of the annular water tank, located on the outer ring of the mixing tank. An installation ring is welded to the bottom of the water-proof ring, and an installation ring is also welded to the circumferential side wall of the annular water tank at the same height as the installation ring. The two installation rings are arranged in an inner and outer ring arrangement with an interlocking arrangement. The cross-section of the installation ring is U-shaped, and inclined tube packing is installed between the two installation rings.

[0023] Furthermore,

[0024] A relay water channel is formed around the bottom side of the water-proof ring, and a water collection weir is welded around the relay water channel and the circumferential side wall of the annular water tank. A treated water outlet pipe is welded at the bottom middle position on the right side of the water-proof ring.

[0025] Furthermore,

[0026] A tapered guide steel plate is welded between the top part of the circumferential sidewall of the mixing tank and the bottom part of the water-proof ring, and an umbrella plate is welded and fitted onto the middle part of the circumferential sidewall of the mixing tank.

[0027] A triangular weir with an annular structure is welded in the space between the umbrella plate and the circumferential side wall of the mixing tank. A ring of water distribution holes is opened around the bottom plate of the triangular weir, and a PMA feed pipe and a greywater feed pipe are welded on the triangular weir. The PMA feed pipe and the greywater feed pipe are perpendicular to each other.

[0028] Furthermore,

[0029] A sludge collection hopper is welded to the bottom of the flocculation cone. A sludge scraping assembly is rotatably installed in the flocculation cone. The sludge scraping assembly is composed of a central U-shaped vertical support frame, scrapers symmetrically welded to both sides of the bottom of the U-shaped vertical support frame, and a rotating shaft welded to the middle of the U-shaped vertical support frame. A toothed ring is welded to the top of the U-shaped vertical support frame.

[0030] Furthermore, a horizontal positioning rod is welded to the top opening of the flocculation cone, the bottom part of the vertical drive shaft is rotatably engaged with the middle part of the horizontal positioning rod, and a drive gear is fitted at the bottom end of the vertical drive shaft.

[0031] A relay gear is rotatably mounted on the bottom side of the middle part of the horizontal positioning rod. The driving gear and the gear ring are aligned internally and externally and mesh with the relay gear for transmission.

[0032] Furthermore,

[0033] A rotating ring is welded to the outer circumference of the first lifting impeller, and an L-shaped mounting rod for downward support is welded to the rotating ring. A tumbling component is rotatably mounted on the horizontal part of the L-shaped mounting rod.

[0034] The tumbling assembly consists of a central rotating shaft sleeve and two suction impellers symmetrically welded to both ends of the central rotating shaft sleeve. Two rolling rings are welded to the outer circumference of the two suction impellers. The two rolling rings abut against the bottom plate of the mixing box. A turning plate is welded around the upper part of the central rotating shaft sleeve. The internal blades of the two suction impellers twist in opposite directions, and the suction forces of the two suction impellers are opposite.

[0035] The flipping plate has an overall arc-shaped structure, and both ends of the flipping plate are welded and fixed together with two rolling rings.

[0036] The dosing process of the mechanically accelerated clarifier dosing equipment includes the following steps:

[0037] 1. The recycled water (raw water) mixed with PAC enters the triangular weir through the recycled water inlet pipe, and then enters the first reaction chamber through a ring of water distribution holes at the bottom of the triangular weir. Then it is lifted into the interior of the rotating suction device by the second lifting impeller.

[0038] 2. After entering the rotary suction component, the water is discharged through a ring of outlets on the annular connecting plate into the water distribution chamber between the mixing tank and the rotary suction component. NaOH enters the water distribution chamber through the NaOH feed pipe and a ring of spray grooves on the inner layer of the circumferential side wall of the mixing tank and mixes with the water.

[0039] 3. Part of the water mixed with NaOH is lifted by the first lifting impeller through the upward flow lifting channel to the second reaction chamber (stirring chamber), and then flows through a ring of conveying ports on the top part of the circumferential side wall of the mixing box to be discharged into the annular water outlet chamber. Part of the water is recirculated through the downward flow circulation channel into the rotating suction device.

[0040] IV. The water inside the annular outlet chamber enters the clarification zone through the annular flow channel at the bottom of the inner ring. During this process, NaOH reacts fully with Ca+ and Mg+ in the water to form flocs. The second reaction chamber, generated by the rotation of the first and second lifting impellers, has a circulation load several times that of the first reaction chamber, thus completing the internal circulation of the water in the clarification tank.

[0041] Fifth, a portion of the water mixed with flocs flows back to the first reaction chamber and meets the raw water in the first reaction chamber that has been doped with PAC and PAM, forming larger flocs. A portion is circulated from the clarification zone through the upper inclined tube packing to accelerate the separation of flocs and clear water. The clear water enters the upper part of the inclined tube packing, is collected through a ring of water collection weirs, flows into a ring of intermediate water passing tanks, and then flows through the annular unloading chamber and the treated water outlet pipe to the lower clear water tank, and subsequently enters the membrane treatment demineralized water treatment system.

[0042] 6. After the flocs are separated from the clear water in the inclined tube packing, they enter the lower part of the clarification zone. Most of the flocs serve as raw water floc crystal nuclei and enter the first reaction chamber for recirculation. The other part of the flocs settles at the bottom of the first reaction chamber and is collected in the sludge collection hopper by the rotating sludge scraper assembly. Finally, the flocs rich in Ca+ and Mg+ precipitates are discharged from the system through the pipe at the bottom of the sludge collection hopper, achieving the effect of removing hardness and suspended solids.

[0043] The mechanically accelerated clarifier dosing equipment provided by this invention has the following beneficial effects:

[0044] In use, the upper part of the water distribution chamber forms an upward flow channel with the axial flow pipe, and the lower part of the water distribution chamber forms a downward flow circulation channel with the bottom of the circulation cone and the positioning ring. A portion of the water that is lifted and sucked into the rotating suction component can circulate multiple times in the rotating suction component and the water distribution chamber through the downward flow circulation channel and the water suction groove at the bottom of the positioning ring, and mix with the sprayed NaOH multiple times. This helps to further and fully mix the water with NaOH, further increasing the intensity of the subsequent reaction and the amount of floc precipitation.

[0045] Furthermore, by setting up fluid circulation channels and forming vortices, this invention can achieve multiple and thorough mixing of NaOH and water by optimizing the fluid flow form and path. Compared with existing technologies that use mechanical rotating stirring components for mixing, the mixing effect is more outstanding, and it can replace traditional mechanical rotating stirring components, eliminating the need for a large amount of electrical energy or other forms of energy consumed by driving mechanical stirring components, which is conducive to energy conservation and emission reduction and improves economic efficiency.

[0046] In addition, the NaOH added in this process can replace the pre-mixing tank of the traditional mechanically accelerated clarification tank in the circulation path space of the second reaction chamber, clarification zone and first reaction chamber. It eliminates the need to build and set up a pre-mixing tank of the mechanically accelerated clarification tank, reducing the land area and infrastructure investment of the project, and also eliminates the need to set up the booster pump in the pre-mixing tank of the mechanically accelerated clarification tank, thus reducing the operating cost. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0048] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0049] In the attached diagram:

[0050] Figure 1 A schematic diagram of the overall structure of Embodiment 1 of the present invention is shown;

[0051] Figure 2 A schematic diagram of the inner half-section structure of the clarifier in Embodiment 1 of the present invention is shown;

[0052] Figure 3 A schematic diagram of the half-section bottom side structure of the clarification tank according to Embodiment 1 of the present invention is shown;

[0053] Figure 4 A schematic diagram of the inner half-section structure of the mixing box according to Embodiment 1 of the present invention is shown;

[0054] Figure 5 The diagram shows the flow path of the treated water inside the clarification tank in Embodiment 1 of the present invention;

[0055] Figure 6 A schematic diagram of the installation position of the water-proof ring according to Embodiment 1 of the present invention is shown;

[0056] Figure 7 A schematic diagram of the inner half-section structure of the rotating suction component according to Embodiment 1 of the present invention is shown;

[0057] Figure 8 A schematic diagram of the external structure of the rotating suction component according to Embodiment 1 of the present invention is shown;

[0058] Figure 9 The present invention illustrates Embodiment 1. Figure 6 Enlarged structural diagram of section A;

[0059] Figure 10 The present invention illustrates Embodiment 1. Figure 5 Enlarged structural diagram of section B.

[0060] Figure 11 A schematic diagram of the installation position of the tumbling assembly according to Embodiment 2 of the present invention is shown;

[0061] Figure 12 An exploded view of the tumbling assembly according to Embodiment 2 of the present invention is shown.

[0062] List of reference numerals

[0063] 1. Clarifying tank; 101. Clarifying cone; 102. Flocculation cone; 103. Conical guide steel plate; 104. Sludge hopper; 105. Horizontal positioning rod; 106. Intermediate gear; 107. Mounting ring; 108. Water-proof ring; 109. Water collection weir;

[0064] 2. Scraper assembly; 201. Toothed ring;

[0065] 3. Inclined tube packing;

[0066] 4. Mixing tank; 401. NaOH feed pipe; 402. Circulating conical shroud; 403. Positioning ring;

[0067] 5. Power assembly; 501. Vertical drive shaft; 502. First lifting impeller; 503. Second lifting impeller; 504. Drive gear; 505. Rotary ring; 506. L-shaped mounting rod;

[0068] 6. Tumbling assembly; 601. Exhaust impeller; 602. Tilting plate;

[0069] 7. Mixing box; 701. Umbrella plate; 702. Axial flow pipe;

[0070] 8. Triangular weir; 801. PMA feed pipe; 802. Reclaimed water inlet pipe;

[0071] 9. Rotary suction component; 901. Triangular scraper groove; 902. Rotary ring;

[0072] 10. Water guide cone cover;

[0073] 11. Treat the water outlet pipe. Detailed Implementation

[0074] 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 of the embodiments of this invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the described embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0075] Example 1: Please refer to Figures 1 to 10 :

[0076] The present invention proposes a mechanically accelerated dosing device for a clarifier, including a clarifier 1 and a power unit 5; the clarifier 1 is composed of a top annular water tank, a clarifier cone 101 welded to the bottom of the annular water tank, and a flocculation cone 102 welded to the bottom of the clarifier cone 101, wherein a power unit 5 is installed at the center of the top plate of the annular water tank.

[0077] A mixing tank 7 is welded and hoisted at the bottom center of the top plate of the annular water tank, and an axial flow pipe 702 is welded through the middle of the bottom plate of the mixing tank 7. A mixing tank 4 is welded and hoisted at the bottom of the axial flow pipe 702.

[0078] The mixing tank 4 has an arched cross-section, and the interior of its circumferential sidewall is hollow. A spray groove is formed around the inner layer of the circumferential sidewall of the mixing tank 4. Both the top and bottom ends of the mixing tank 4 are open. A circulation cone hood 402 is welded and suspended on the bottom opening of the mixing tank 4. A positioning ring 403 protruding upward is welded on the bottom opening of the circulation cone hood 402. A water suction groove is formed around the bottom of the positioning ring 403. A NaOH feed pipe 401 is welded to the outer layer of the circumferential sidewall of the mixing tank 4.

[0079] A vertical drive shaft 501 is axially mounted at the center of the power assembly 5. The vertical drive shaft 501 is rotatably connected to the water guide cone 10, the axial flow pipe 702, the mixing tank 4, and the positioning ring 403 from top to bottom. A first lifting impeller 502 is installed on the part of the vertical drive shaft 501 located in the opening at the top of the axial flow pipe 702, and a second lifting impeller 503 is installed on the part of the vertical drive shaft 501 located in the opening at the top of the positioning ring 403. A rotating suction component 9 is welded and fitted onto the part of the vertical drive shaft 501 located in the mixing tank 4. The rotating suction component 9 has a diamond-shaped cross-section and is composed of two symmetrically welded umbrella-shaped covers. A rotating ring 902 is welded to the bottom opening of the lower umbrella-shaped cover, and the rotating ring 902 is rotatably connected to the positioning ring 403. An annular connecting plate is welded between the upper and lower umbrella-shaped covers. The annular connecting plate has an arc-shaped cross-section and a ring of water outlets is opened around the annular connecting plate.

[0080] Preferred,

[0081] A ring-shaped water distribution cavity with an arc-shaped cross-section is formed between the annular connecting plate and the inner layer of the circumferential side wall of the mixing tank 4. The water in the distribution cavity is mixed with the NaOH solution. Since the water distribution cavity is annular and has an arc-shaped cross-section, the water flowing through it can be spread and diffused into an annular structure.

[0082] First, the thinned water flow has a smaller thickness and a smaller flow volume per unit mixing area, which allows the NaOH solution sprayed from the spray tank to easily penetrate and fully diffuse and mix throughout the entire thickness. Compared to directly spraying NaOH into a thick layer of greywater, this avoids the situation where NaOH cannot penetrate the greywater flow in a short time, preventing it from reaching the center or middle of the greywater flow and thus failing to fully mix with it.

[0083] Secondly, the ring-shaped water flow is compatible with the surrounding arrangement of the spray channels, which is conducive to the uniform and comprehensive addition of NaOH into the water flow. This also facilitates the thorough mixing of NaOH and water, enhances the intensity of subsequent reactions and the amount of floc precipitation, and accelerates the precipitation of flocs.

[0084] In addition, an upward flow lifting channel is formed between the upper half of the water distribution chamber and the axial flow pipe 702, and a downward flow circulation channel is formed between the lower half of the water distribution chamber and the bottom part of the circulation cone 402 and the positioning ring 403. A portion of the water that is lifted and sucked into the rotating suction component 9 can circulate multiple times in the rotating suction component 9 and the water distribution chamber through the downward flow circulation channel and the water suction groove at the bottom of the positioning ring 403, and mix with the sprayed NaOH multiple times. This helps the water to mix more thoroughly with NaOH, further increasing the intensity of the subsequent reaction and the amount of floc precipitation.

[0085] The circulation mechanism of the water in the circulation channel is as follows: First, the cross-section of the circumferential side wall of the mixing tank 4 is arched, and its lower half has a certain characteristic of guiding the fluid downward. The first lifting impeller 502 is located in the upper space of the positioning ring 403. Its rotation and suction will increase the speed of the fluid inside the positioning ring 403 and create a negative pressure inside the positioning ring 403, especially in the bottom space, which is less than the outside pressure. This, together with the downward guiding effect of the arched side wall of the mixing tank 4, can promote the fluid to circulate in the circulation channel into the rotating suction component 9.

[0086] Preferred,

[0087] A triangular scraper groove 901 is welded around the inner circumference of the annular connecting plate. The water inlet end of the triangular scraper groove 901 faces the inside of the rotating suction component 9, and the water outlet end is connected to the water outlet. When the triangular scraper groove 901 rotates with the rotating suction component 9 at a high speed, a conveying water flow can be formed inside it and directed towards the water outlet. This conveying water flow, combined with the centrifugal force of rotation, can squeeze the fluid inside it out of the water outlet, thereby increasing the drainage flow rate and rotational suction force of the rotating suction component 9 and ensuring that the rotating suction component 9 has better rotational suction and conveying performance for the fluid.

[0088] Preferred,

[0089] The mixing tank 7 is circular in shape and has a U-shaped cross-section. A water guide cone shroud 10, concentric with the mixing tank 7, is welded and hoisted to the bottom of the top plate of the annular water tank.

[0090] A conveying port is provided around the top of the circumferential side wall of the mixing tank 7. The part where the top of the circumferential side wall of the mixing tank 7 connects to the annular water tank, the part where the circumferential side wall of the mixing tank 7 connects to the bottom plate, and the part where the bottom plate of the mixing tank 7 connects to the axial flow pipe 702 are all arc transition structures. Through the arc surface guidance of these arc transition structures and the inclined guidance of the water guide cone 10, the fluid has a preliminary tendency to rotate and flow inside the mixing chamber, which is conducive to the formation of vortex.

[0091] The mixing chamber 7 forms a stirring chamber for water circulation and rotation between its outer circumferential wall, axial flow pipe 702, and water guide cone 10. The stirring chamber can also be used for the reaction of NaOH with Ca+ and Mg+ in the water, and is also called the second reaction chamber. Based on the above rotational flow trend, the water flow impact force generated by the upward conveying of the first lifting impeller 502 can form a vortex of water mixed with NaOH inside the stirring chamber. Under the clamping of this vortex, part of the NaOH water is directly discharged through a ring conveying port, while part of it follows the vortex and rotates multiple times inside the stirring chamber. The water that is repeatedly tumbled and circulated is conducive to further and more thorough mixing with NaOH, further increasing the intensity of the subsequent reaction and the amount of floc precipitation.

[0092] Preferred,

[0093] A water-blocking ring 108 is welded and hoisted to the bottom of the top plate of the annular water tank, located on the outer ring of the mixing tank 7. A mounting ring 107 is welded to the bottom of the water-blocking ring 108, and a mounting ring 107 is also welded to the circumferential side wall of the annular water tank at the same height as the mounting ring 107. The two mounting rings 107 are arranged in an inner and outer ring arrangement with an interlocking arrangement. The cross-section of the mounting ring 107 is U-shaped. An inclined tube packing 3 is installed between the two mounting rings 107. A circular flow channel is provided between the bottom of the inner mounting ring 107 and the outer circumferential wall of the umbrella plate 701.

[0094] Preferred,

[0095] A relay water passage is formed around the bottom side of the water-proof ring 108, and a water collection weir 109 is welded around the relay water passage and the circumferential side wall of the annular water tank. A treated water outlet pipe 11 is welded at the bottom middle position on the right side of the water-proof ring 108. A ring-shaped water discharge cavity with a triangular cross-section is formed between the water-proof ring 108, the conical guide steel plate 103 and the top plate of the annular water tank.

[0096] Preferred,

[0097] A conical guide steel plate 103 is welded between the top part of the circumferential sidewall of the mixing tank 7 and the bottom part of the water-proof ring 108. An umbrella plate 701 is welded and fitted in the middle part of the circumferential sidewall of the mixing tank 7. A ring-shaped flow channel is also provided between the bottom end of the umbrella plate 701 and the inner circumferential wall of the clarifying cone shroud 101. A ring-shaped water outlet cavity with an overall rhomboid cross-section is formed between the conical guide steel plate 103, the inner mounting ring 107, the circumferential sidewall of the mixing tank 7, and the top plate of the annular water tank.

[0098] A triangular weir with an annular structure is welded in the space between the umbrella plate 701 and the circumferential side wall of the mixing box 7. A ring of water distribution holes is opened around the bottom plate of the triangular weir 8, and a PMA feed pipe 801 and a greywater inlet pipe 802 are welded on the triangular weir 8. The PMA feed pipe 801 and the greywater inlet pipe 802 are perpendicular to each other. Between the umbrella plate 701 and the inclined tube packing 3 is an annular clarification zone with a triangular cross-section. The part of the clarification cone 101 and the flocculation cone 102 located below the umbrella plate 701 is the first reaction chamber. A pipeline mixer is installed on the greywater inlet pipe 802 for adding PAC.

[0099] Preferred,

[0100] A sludge collection hopper 104 is welded to the bottom of the flocculation cone 102. A sludge scraping assembly 2 is rotatably installed in the flocculation cone 102. The sludge scraping assembly 2 is composed of a central U-shaped vertical support frame, scrapers symmetrically welded to both sides of the bottom of the U-shaped vertical support frame, and a rotating shaft welded to the middle position of the U-shaped vertical support frame. A toothed ring 201 is welded to the top of the U-shaped vertical support frame.

[0101] Preferred,

[0102] A horizontal positioning rod 105 is welded to the top opening of the flocculation cone 102. The bottom part of the vertical drive shaft 501 is rotatably engaged with the middle part of the horizontal positioning rod 105, and a drive gear 504 is fitted at the bottom end of the vertical drive shaft 501.

[0103] A relay gear 106 is rotatably mounted on the bottom side of the middle part of the horizontal positioning rod 105. The drive gear 504 and the gear ring 201 are meshed with the relay gear 106 in an inner-outer correspondence. Through the relay gear 106, the vertical drive shaft 501 can reduce the speed and drive the gear ring 201 and the sludge scraping assembly 2 to rotate and scrape mud. The drive gear 504 transmits power to the gear ring 201 through the relay gear 106. The diameter of the drive gear 504 is smaller than that of the relay gear 106, and the diameter of the relay gear 106 is much smaller than that of the gear ring 201. Through the speed reduction and torque increase characteristics of the small gear driving the large gear, the drive gear 504 can reduce the speed of the gear ring 201 and the sludge scraping assembly 2 in two stages and increase the rotational torque of the sludge scraping assembly 2.

[0104] Based on Example 1, such as Figures 11 to 12 As shown, Example 2:

[0105] A rotating ring 505 is welded to the outer circumference of the first lifting impeller 502. An L-shaped mounting rod 506 supporting downwards is welded to the rotating ring 505. A tumbling assembly 6 is rotatably mounted on the horizontal part of the L-shaped mounting rod 506. Through the rotating ring 505 and the L-shaped mounting rod 506, the first lifting impeller 502 can drive the tumbling assembly 6 to rotate around the vertical drive shaft 501. Since the two rolling rings are in contact with the bottom plate of the mixing box 7, the body of the tumbling assembly 6 can also be driven to roll by friction from the bottom plate of the mixing box 7 when it rotates.

[0106] The tumbling assembly 6 consists of a central rotating shaft sleeve and two symmetrically welded exhaust impellers 601 at both ends of the central rotating shaft sleeve. Two rolling rings are welded to the circumference of each exhaust impeller 601, and these rolling rings abut against the bottom plate of the mixing tank 7. A turning plate 602 is welded around the upper part of the central rotating shaft sleeve. The blades inside the two exhaust impellers 601 rotate in opposite directions. Because a portion of the water continuously circulates in the mixing chamber with the swirling flow, it stays in the mixing chamber for a longer time. This results in a longer reaction time with NaOH, inevitably leading to the precipitation of some flocs. Under the action of centrifugal force, the flocs may be thrown out and deposited on the bottom plate of the mixing tank 7. Through a ring of turning plates 602, the rolling tumbling assembly 6 can lift up the flocs that have precipitated and deposited on the bottom plate of the mixing tank 7, so that the flocs can be continuously discharged from the ring conveyor port with the vortex, avoiding the continuous deposition of flocs on the bottom plate of the mixing tank 7, which requires the trouble of regular manual cleaning. In addition, the suction forces of the two suction impellers 601 are opposite, which can suck the flocs on the arc transition part on both sides of the bottom plate of the mixing tank 7 to the ring of turning plates 602 and lift them up, avoiding the deposition of flocs on both sides of the bottom plate of the mixing tank 7.

[0107] The tipping plate 602 has an overall arc-shaped structure, which is adapted to the rotation direction of the bottom of the vortex. This can minimize the interference and influence of the tumbling assembly 6 on the vortex. Furthermore, the two ends of the tipping plate 602 are welded and fixed together with two rolling rings.

[0108] Working principle of mechanical accelerated clarification tank dosing equipment:

[0109] The recycled water (raw water) mixed with PAC enters the triangular weir 8 through the recycled water inlet pipe 802, and then enters the first reaction chamber through a ring of water distribution holes at the bottom of the triangular weir 8. Then it is lifted into the interior of the rotating suction component 9 by the second lifting impeller 503.

[0110] After entering the rotary suction component 9, the water is discharged through a ring of outlets on the annular connecting plate into the water distribution chamber between the mixing tank 4 and the rotary suction component 9. NaOH enters the water distribution chamber through the NaOH feed pipe 401 and a ring of spray grooves on the inner layer of the circumferential side wall of the mixing tank 4 to mix with the water.

[0111] Part of the water mixed with NaOH is lifted by the first lifting impeller 502 through the upward flow lifting channel to the second reaction chamber (stirring chamber), and then flows through a ring of conveying ports on the top part of the circumferential side wall of the mixing box 7 to be discharged into the annular water outlet chamber. Part of the water enters the rotating suction device 9 for recirculation through the downward flow circulation channel.

[0112] The water inside the annular outlet chamber enters the clarification zone through the annular flow channel at the bottom of the inner installation ring 107. During this process, NaOH reacts fully with Ca+ and Mg+ in the water to form flocs. The second reaction chamber, generated by the rotation of the first lifting impeller 502 and the second lifting impeller 503, has a circulation load several times that of the first reaction chamber, thus completing the internal circulation of the water in the clarification tank 1.

[0113] Then, part of the water mixed with flocs flows back to the first reaction chamber and meets the raw water in the first reaction chamber that has been doped with PAC and PAM, forming larger flocs. Part of the water is circulated from the clarification zone through the upper inclined tube packing 3 to accelerate the separation of flocs and clear water. The clear water enters the upper part of the inclined tube packing 3, is collected through a ring of water collection weirs 109, flows into a ring of intermediate water passing tanks, and then flows through the annular unloading chamber and the treated water outlet pipe 11 to the lower clear water tank, and then enters the membrane treatment demineralized water treatment system.

[0114] After the flocs are separated from the clear water in the inclined tube packing 3, they enter the lower part of the clarification zone. Most of the flocs serve as raw water floc crystal nuclei and enter the first reaction chamber for recirculation. The other part of the flocs settles at the bottom of the first reaction chamber and is collected in the sludge collection hopper 104 by the rotating scraper assembly 2. Finally, the flocs rich in Ca+ and Mg+ precipitates are discharged from the system through the pipe at the bottom of the sludge collection hopper 104, thus achieving the effect of removing hardness and suspended solids.

[0115] In the above process, the NaOH added can replace the pre-mixing tank of the traditional mechanically accelerated clarification tank in the circulation path space of the second reaction chamber, clarification zone and first reaction chamber. It eliminates the need to build and set up a pre-mixing tank of the mechanically accelerated clarification tank, reducing the land area and infrastructure investment of the project, and also eliminates the need to set up the booster pump in the pre-mixing tank of the mechanically accelerated clarification tank, thus reducing the operating cost.

[0116] The following points should be noted in this article:

[0117] 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0118] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0119] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. Mechanically accelerated clarifier dosing equipment, including: Clarification tank (1) and power assembly (5); The clarification tank (1) is composed of a top annular water tank, a clarification cone (101) welded to the bottom of the annular water tank, and a flocculation cone (102) welded to the bottom of the clarification cone (101), wherein a power assembly (5) is installed at the center of the top plate of the annular water tank. The feature is that a mixing tank (7) is welded and hoisted at the bottom middle position of the top plate of the annular water tank, and an axial flow pipe (702) is welded through the middle position of the bottom plate of the mixing tank (7), and a mixing tank (4) is welded and hoisted at the bottom of the axial flow pipe (702). The mixing tank (4) has an arched cross-section, and the interior of the circumferential sidewall of the mixing tank (4) is hollow. A spray groove is formed around the inner layer of the circumferential sidewall of the mixing tank (4). Both the upper and lower ends of the mixing tank (4) are open. A circulating conical cover (402) is welded and suspended on the bottom opening of the mixing tank (4). A positioning ring (403) protruding upward is welded on the bottom opening of the circulating conical cover (402). A water suction groove is formed around the bottom of the positioning ring (403). A NaOH feed pipe (401) is welded on the outer layer of the circumferential sidewall of the mixing tank (4). A vertical drive shaft (501) is axially mounted at the center of the power assembly (5). The vertical drive shaft (501) is rotatably connected to the water guide cone (10), the axial flow pipe (702), the mixing tank (4), and the positioning ring (403) from top to bottom. A first lifting impeller (502) is installed on the portion of the vertical drive shaft (501) located in the opening at the top of the axial flow pipe (702), and a second lifting impeller (503) is installed on the portion of the vertical drive shaft (501) located in the opening at the top of the positioning ring (403). Furthermore, a rotating suction component (9) is welded onto the part of the vertical drive shaft (501) located in the mixing tank (4); the rotating suction component (9) has a rhomboid cross-section and is composed of two umbrella-shaped covers welded symmetrically, and a rotating ring (902) is welded onto the bottom opening of the lower umbrella-shaped cover, and the rotating ring (902) rotates in conjunction with the positioning ring (403); an annular connecting plate is welded between the upper and lower umbrella-shaped covers, the cross-section of the annular connecting plate has an arc-shaped structure, and a ring of water outlets is opened around the annular connecting plate; A ring-shaped water distribution cavity with an arc-shaped cross-section is formed between the annular connecting plate and the inner layer of the circumferential side wall of the mixing tank (4). An upward flow lifting channel is formed between the upper half of the water distribution cavity and the axial flow pipe (702), and a downward flow circulation channel is formed between the lower half of the water distribution cavity and the bottom side of the circulation cone cover (402) and the positioning ring (403).

2. The mechanically accelerated clarifier dosing equipment according to claim 1, characterized in that, A triangular scraper groove (901) is welded around the inner circumference of the annular connecting plate, with the water inlet end of the triangular scraper groove (901) facing the interior of the rotating suction component (9), and the water outlet end connected to the water outlet.

3. The mechanically accelerated clarifier dosing equipment according to claim 1, characterized in that, The mixing tank (7) is circular in shape and has a U-shaped cross section. A water guide cone (10) concentric with the mixing tank (7) is welded and hoisted to the bottom of the top plate of the annular water tank. A conveying port is provided around the top part of the circumferential side wall of the mixing tank (7), and the part where the top part of the circumferential side wall of the mixing tank (7) is connected to the annular water tank, the part where the circumferential side wall of the mixing tank (7) is connected to the bottom plate, and the part where the bottom plate of the mixing tank (7) is connected to the axial flow pipe (702) all have a rounded transition structure. The mixing chamber (7) forms a stirring chamber for water circulation rotation between its circumferential outer wall, axial flow pipe (702) and water guide cone (10).

4. The mechanically accelerated clarifier dosing equipment according to claim 1, characterized in that, A water-proof ring (108) is welded and hoisted at the bottom of the top plate of the annular water tank, located on the outer ring of the mixing tank (7). A mounting ring (107) is welded to the bottom of the water-proof ring (108), and a mounting ring (107) is also welded at the same height as the mounting ring (107) on the circumferential side wall of the annular water tank. The two mounting rings (107) are arranged in an inner and outer ring arrangement with an interval. The cross-section of the mounting ring (107) is U-shaped. Inclined tube packing (3) is installed between the two mounting rings (107).

5. The mechanically accelerated clarifier dosing equipment according to claim 4, characterized in that, A relay water channel is provided around the bottom side of the water-proof ring (108), and a water collection weir (109) is welded around the circumferential side wall of the annular water tank. A treatment water outlet pipe (11) is welded at the bottom right side of the water-proof ring (108).

6. The mechanically accelerated clarifier dosing equipment according to claim 4, characterized in that, A conical guide steel plate (103) is welded between the top part of the circumferential sidewall of the mixing box (7) and the bottom part of the water-proof ring (108), and an umbrella plate (701) is welded and fitted onto the middle part of the circumferential sidewall of the mixing box (7). A triangular weir (8) with an annular structure is welded in the space between the umbrella plate (701) and the circumferential side wall of the mixing box (7). A ring of water distribution holes is opened around the bottom plate of the triangular weir (8), and a PMA feed pipe (801) and a greywater feed pipe (802) are welded on the triangular weir (8). The PMA feed pipe (801) and the greywater feed pipe (802) are perpendicular to each other.

7. The mechanically accelerated clarifier dosing equipment according to claim 1, characterized in that, A sludge collection hopper (104) is welded to the bottom of the flocculation cone (102). A sludge scraping assembly (2) is rotatably installed in the flocculation cone (102). The sludge scraping assembly (2) is composed of a middle U-shaped vertical support frame, scrapers symmetrically welded to the bottom two sides of the U-shaped vertical support frame, and a rotating shaft welded to the middle position of the U-shaped vertical support frame. A toothed ring (201) is welded to the top of the U-shaped vertical support frame.

8. The mechanically accelerated clarifier dosing equipment according to claim 7, characterized in that, A horizontal positioning rod (105) is welded to the top opening of the flocculation cone (102). The bottom part of the vertical drive shaft (501) is rotatably engaged with the middle part of the horizontal positioning rod (105), and a drive gear (504) is fitted at the bottom end of the vertical drive shaft (501). A relay gear (106) is rotatably mounted on the bottom side of the middle part of the horizontal positioning rod (105). The driving gear (504) and the gear ring (201) are in an inner and outer correspondence and mesh with the relay gear (106) for transmission.

9. The mechanically accelerated clarifier dosing equipment according to claim 1, characterized in that, The first lifting impeller (502) has a rotating ring (505) welded to its circumference. An L-shaped mounting rod (506) for downward support is welded to the rotating ring (505). A tumbling assembly (6) is rotatably mounted on the horizontal part of the L-shaped mounting rod (506). The tumbling assembly (6) is composed of a central rotating shaft sleeve and two suction impellers (601) symmetrically welded to both ends of the central rotating shaft sleeve. Two roller rings are welded to the outer circumference of the two suction impellers (601). The two roller rings abut against the bottom plate of the mixing box (7). A turning plate (602) is welded around the upper part of the central rotating shaft sleeve. The blades inside the two suction impellers (601) have opposite twisting directions, and the suction forces of the two suction impellers (601) are opposite. The turning plate (602) has an arc-shaped structure, and the two ends of the turning plate (602) are welded and fixed together with the two roller rings.

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