Polyaluminum chloride stirring and precipitation system

Abstract

A kind of polyaluminium chloride stirring precipitation system, it is characterized by including stirring tank and sedimentation tank, stirring tank includes reaction tank body 1 and stirring shaft 2, reaction tank body 1 top is provided with fluid feed inlet 3 and powder feed inlet 4, reaction tank body 1 bottom is provided with discharge port, stirring shaft 2 movable seal installation is in reaction tank body 1, stirring shaft 2 is rotated by motor, stirring shaft 2 middle part is provided with a pair of scraper type stirring paddle 5, stirring shaft 2 lower part is provided with disc turbine type stirring paddle 6;Advantages are: raw materials are uniformly mixed, while stirring, can scrape the raw materials adhered on the wall of tank.Sedimentation tank is assisted by screw conveyor to discharge, and the deposition material is discharged quickly, so it is not easy to be blocked, and the maintenance cost is reduced.Supernatant is filtered by filter screen for secondary filtration and then enters supernatant area, to further reduce the impurities in supernatant.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment, specifically to a polyaluminum chloride stirring and sedimentation system. Background Technology

[0002] Polyaluminum chloride (PAC) is available in two types: one for drinking water and one for industrial water, each adhering to different relevant standards. It appears yellow, light yellow, dark brown, or dark gray, and exists in both liquid and solid forms. This product has strong bridging and adsorption properties, and during hydrolysis, it undergoes physicochemical processes such as coagulation, adsorption, and precipitation. The fundamental difference between PAC and traditional inorganic coagulants lies in their structure. Traditional inorganic coagulants are low-molecular-weight crystalline salts, while PAC is composed of multi-component carboxyl complexes with varying morphologies. It exhibits rapid flocculation and sedimentation, a wide applicable pH range, no corrosiveness to pipes and equipment, and significant water purification effects. This product is widely used in drinking water, industrial water, and wastewater treatment. PAC solution is formed by mixing aluminum trichloride and calcium aluminate. The PAC solution requires sedimentation followed by pressure filtration and final drying. Existing sedimentation tanks often experience clogging of the discharge port during sediment removal, resulting in slow discharge rates. Furthermore, the strong water flow when the PAC solution is introduced into the sedimentation tank can easily cause untreated solution to be directly injected into the clear liquid area. Synthesizing aluminum trichloride solution and calcium aluminate powder is a common production process, which involves exothermic mixing. Existing stirred reaction vessels used in this process suffer from uneven mixing of raw materials, leading to material sedimentation at the bottom of the vessel. Furthermore, prolonged use can cause raw materials to adhere to the vessel walls. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned shortcomings by providing a polyaluminum chloride stirring and sedimentation system.

[0004] This utility model includes a mixing tank and a sedimentation tank. The mixing tank includes a reaction tank body and a stirring shaft. A fluid inlet and a powder inlet are provided at the top of the reaction tank body, and a discharge port is provided at the bottom of the reaction tank body. The stirring shaft is movably and sealed in the reaction tank body and is driven to rotate by an electric motor. A pair of scraper-type stirring paddles are provided in the middle of the stirring shaft, and a disc turbine-type stirring paddle is provided at the bottom of the stirring shaft.

[0005] The sedimentation tank includes a sedimentation tank body and a screw conveyor. A sludge discharge groove is provided at the bottom of the sedimentation tank body. An inlet slope is provided on one side of the sludge discharge groove, and a settling slope is provided on the other side of the sludge discharge groove. The screw conveyor is installed in the sludge discharge groove. A sedimentation liquid inlet pipe is provided at one end of the sedimentation tank body, and an upper liquid discharge pipe is provided at the other end of the sedimentation tank body.

[0006] The discharge port of the reaction vessel is connected to the sediment inlet pipe.

[0007] The scraper-type agitator includes a pair of connecting rod blades and a wall scraping blade. A pair of bushings are provided on the agitator shaft. One end of the pair of connecting rod blades is respectively installed on the corresponding bushings, and the other end of the pair of connecting rod blades is installed on the wall scraping blade. The bottom of the wall scraping blade is provided with an inwardly inclined scraping blade. A vertical scraper is provided on the wall scraping blade, and an inclined scraper is provided on the inclined scraping blade. A stabilizing connecting rod is provided between the lower connecting rod blade and the inclined scraping blade. The vertical scraper is detachably installed on the wall scraping blade by bolts, and the inclined scraper is detachably installed on the inclined scraping blade by bolts.

[0008] The disc turbine impeller consists of a mounting disc and a set of turbine blades. The mounting disc is mounted on the agitator shaft, and the set of turbine blades is evenly distributed in a ring on the mounting disc.

[0009] A stirring base is installed above the discharge port of the reaction vessel, and the bottom of the stirring shaft is movably sealed on the stirring base. The stirring base consists of a shaft seat and a set of support rods. The bottom of the stirring shaft is installed inside the shaft seat, and the shaft seat is installed at the bottom of the reaction vessel through a set of support rods.

[0010] The outer wall of the reaction vessel is covered with a heat exchange jacket; a discharge device is installed at the powder inlet.

[0011] The cross-section of the sewage discharge groove is U-shaped, and a sewage discharge pipe is provided at the bottom of one end of the sewage discharge groove. The spiral blades of the screw conveyor are located inside the sewage discharge groove. The screw conveyor is a shaftless screw conveyor. A pair of branch discharge pipes are provided at the outlet end of the sedimentation inlet pipe. The outlet end of the branch discharge pipe is connected to the inner cavity of the sedimentation tank.

[0012] The sedimentation tank is equipped with a bottom baffle and a top baffle. The bottom baffle is installed on the settling slope, and the top baffle is installed on the inner wall of the sedimentation tank. A filtration zone is formed between the bottom baffle and the top baffle. A flow zone is formed between the bottom of the top baffle and the settling slope. A supernatant zone is formed between the top baffle and the inner wall of the sedimentation tank. The supernatant discharge pipe is installed in the supernatant zone. A sludge outlet is provided at the bottom of the filtration zone. A filter screen is provided at the top of the bottom baffle.

[0013] The sedimentation tank is located above the bottom baffle. Filter screen mounting slots are provided on the inner walls of both sides of the tank. Filter screens are inserted into a pair of filter screen mounting slots.

[0014] A baffle plate is installed on the inner wall above the middle part of the sedimentation tank, and the baffle plate is inclined toward the sedimentation inlet pipe.

[0015] The advantages of this invention are: the raw materials are mixed evenly, and the material adhering to the tank wall can be scraped off during stirring. The sedimentation tank uses a screw conveyor to assist in material discharge, resulting in fast discharge of sediment, reduced clogging, and lower maintenance costs. The supernatant enters the supernatant area after secondary filtration through a filter screen, further reducing impurities in the supernatant. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the mixing tank of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the stirring paddle of this utility model.

[0018] Figure 3 This is a schematic diagram of the sedimentation tank of this utility model.

[0019] Figure 4 This is a cross-sectional structural diagram of the sedimentation tank of this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the screw conveyor of this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of this invention, it should be noted that if terms such as "upper," "lower," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, if terms such as "first" and "second" appear in the description of this invention, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the embodiments of this invention, it should also be noted that unless otherwise explicitly specified and limited, the terms "set" and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] As shown in the attached figure, this utility model includes a stirring tank and a sedimentation tank. The stirring tank includes a reaction tank body 1 and a stirring shaft 2. The top of the reaction tank body 1 is provided with a fluid inlet 3 and a powder inlet 4, and the bottom of the reaction tank body 1 is provided with a discharge port. The stirring shaft 2 is movably and sealed inside the reaction tank body 1 and is driven to rotate by a motor. A pair of scraper-type stirring paddles 5 are provided in the middle of the stirring shaft 2, and a disc turbine-type stirring paddle 6 is provided at the bottom of the stirring shaft 2.

[0023] The sedimentation tank includes a sedimentation tank body 41 and a screw conveyor 42. The bottom of the sedimentation tank body 41 is provided with a sludge discharge groove 43. One side of the sludge discharge groove 43 is provided with an inlet slope 44, and the other side of the sludge discharge groove 43 is provided with a settling slope 45. The screw conveyor 42 is installed in the sludge discharge groove 43. One end of the sedimentation tank body 41 is provided with a sedimentation liquid inlet pipe 46, and the other end of the sedimentation tank body 41 is provided with an upper liquid discharge pipe 47.

[0024] The discharge port of reaction vessel 1 is connected to the sediment inlet pipe 46.

[0025] The scraper-type stirring paddle 5 includes a pair of connecting rod blades 7 and a wall scraping blade 8. A pair of bushings are provided on the stirring shaft 2. One end of the pair of connecting rod blades 7 is respectively installed on the corresponding bushings, and the other end of the pair of connecting rod blades 7 is installed on the wall scraping blade 8. The bottom of the wall scraping blade 8 is provided with an inwardly inclined scraping blade 9. A vertical scraper 10 is provided on the wall scraping blade 8, and an inclined scraper 11 is provided on the inclined scraping blade 9. A stabilizing connecting rod 12 is provided between the lower connecting rod blade 7 and the inclined scraping blade 9. The vertical scraper 10 is detachably installed on the wall scraping blade 8 by bolts, and the inclined scraper 11 is detachably installed on the inclined scraping blade 9 by bolts.

[0026] The disc turbine impeller 6 consists of a mounting disc 13 and a set of turbine blades 14. The mounting disc 13 is mounted on the stirring shaft 2, and the set of turbine blades 14 is evenly distributed in a ring on the mounting disc 13.

[0027] A stirring base 15 is provided above the discharge port of the reaction vessel 1, and the bottom of the stirring shaft 2 is movably sealed on the stirring base 15. The stirring base 15 consists of a shaft seat and a set of support rods. The bottom of the stirring shaft 2 is installed in the shaft seat, and the shaft seat is installed at the bottom of the reaction vessel 1 through a set of support rods.

[0028] The outer wall of the reaction vessel 1 is covered with a heat exchange jacket 16; a discharge device is installed on the powder inlet 4.

[0029] The cross-section of the sewage discharge groove 43 is U-shaped. A sewage discharge pipe is provided at the bottom of one end of the sewage discharge groove 43. The spiral blades of the screw conveyor 42 are located inside the sewage discharge groove 43. The screw conveyor 42 is a shaftless screw conveyor. A pair of branch discharge pipes are provided at the outlet end of the sedimentation inlet pipe 46. The outlet end of the branch discharge pipe is connected to the inner cavity of the sedimentation tank body 41.

[0030] The sedimentation tank 41 is equipped with a bottom baffle 48 and a top baffle 49. The bottom baffle 48 is installed on the settling slope 45, and the top baffle 49 is installed on the inner wall of the sedimentation tank 41. A filtration zone 50 is formed between the bottom baffle 48 and the top baffle 49. A flow zone is formed between the bottom of the top baffle 49 and the settling slope 45. A supernatant zone 51 is formed between the top baffle 49 and the inner wall of the sedimentation tank 41. An upper liquid discharge pipe 47 is installed in the supernatant zone 51. A sludge discharge port is provided at the bottom of the filtration zone 50. A filter screen 52 is provided at the top of the bottom baffle 48.

[0031] The sedimentation tank body 41 located above the bottom baffle 48 has filter screen mounting slots on both sides of its inner wall, and filter screens 52 are inserted into a pair of filter screen mounting slots.

[0032] A baffle plate 53 is installed on the inner wall above the middle part of the sedimentation tank 41, and the baffle plate 53 is inclined toward the sedimentation inlet pipe 46.

[0033] Example 1: Aluminum trichloride solution is added to reaction vessel 1 through fluid inlet 3, and calcium aluminate powder is added to reaction vessel 1 through powder inlet 4. Driven by a motor, stirring shaft 2 rotates, and scraper-type stirring paddle 5 agitates the large area of ​​raw materials in the middle, while disc turbine-type stirring paddle 6 agitates the raw materials at the bottom. Simultaneously, vertical scraper 10 and inclined scraper 11 scrape off the raw materials on the inner wall of reaction vessel 1 to prevent adhesion. Stirring base 15 provides auxiliary support to stirring shaft 2 from below, making it more stable during rotation and preventing shaking. Multi-bladed disc turbine-type stirring paddle 6 provides additional shearing agitation at the bottom, preventing raw material settling. A stabilizing connecting rod 12 is added to further stabilize the inclined scraper blades 9 during agitation. A packing seal is used between stirring shaft 2 and the lid of reaction vessel 1 to ensure sealing during rotation, and a packing seal is also used between the bottom of stirring shaft 2 and stirring base 15. Hot water or cooling water is introduced into the heat exchange jacket 16 to raise or lower the reaction temperature of the raw materials in the reaction tank 1, reduce the temperature gradient in the pipes, and ensure stable product quality. After the reaction is complete, the valve on the discharge port is opened to discharge the turbid polyaluminum chloride solution.

[0034] The turbid polyaluminum chloride (PAC) solution is fed into the sedimentation tank 41 through the sedimentation inlet pipe 46. The PAC solution settles within the sedimentation tank 41, and the supernatant is filtered through the filter screen 52 and then fed into the filtration zone 50. The supernatant in the filtration zone 50 is blocked by the top baffle 49 and enters the supernatant zone 51 from below. The upper layer of PAC solution in the supernatant zone 51 is discharged to the next working position through the upper liquid discharge pipe 47. When it is necessary to discharge the sediment at the bottom of the sedimentation tank 41, the screw conveyor 42 is started. The screw conveyor 42 continuously agitates the sediment and moves it towards the drain pipe, through which it is discharged. A pair of branch drain pipes are provided at the outlet end of the sedimentation inlet pipe 46 to ensure that the outflow of the PAC solution during feeding flows more evenly towards the bottom baffle 48, reducing water flow impact. When the water flow rate is high during feeding, the turbid polyaluminum chloride liquid above is blocked by the baffle plate 53 and directly enters the filter screen 52. The screw conveyor 42 is a shaftless screw conveyor, which is less prone to clogging compared to screw conveyors with a through shaft.

Claims

1. A polyaluminum chloride stirring and sedimentation system, characterized in that... It includes a mixing tank and a sedimentation tank. The mixing tank includes a reaction tank body (1) and a stirring shaft (2). The top of the reaction tank body (1) is provided with a fluid inlet (3) and a powder inlet (4). The bottom of the reaction tank body (1) is provided with a discharge port. The stirring shaft (2) is installed inside the reaction tank body (1) with a movable seal. The stirring shaft (2) is driven to rotate by a motor. A pair of scraper-type stirring paddles (5) are provided in the middle of the stirring shaft (2). A disc turbine-type stirring paddle (6) is provided at the bottom of the stirring shaft (2). The sedimentation tank includes a sedimentation tank body (41) and a screw conveyor (42). The bottom of the sedimentation tank body (41) is provided with a sludge discharge groove (43). A water inlet slope (44) is provided on one side of the sludge discharge groove (43), and a settling slope (45) is provided on the other side of the sludge discharge groove (43). The screw conveyor (42) is installed in the sludge discharge groove (43). A sedimentation liquid inlet pipe (46) is provided at one end of the sedimentation tank body (41), and an upper liquid discharge pipe (47) is provided at the other end of the sedimentation tank body (41). The discharge port of the reaction vessel (1) is connected to the sediment inlet pipe (46).

2. The polyaluminum chloride stirring and sedimentation system according to claim 1, characterized in that, The scraper-type stirring paddle (5) includes a pair of connecting rod blades (7) and a wall scraping blade (8). A pair of bushings are provided on the stirring shaft (2). One end of the pair of connecting rod blades (7) is respectively installed on the corresponding bushings, and the other end of the pair of connecting rod blades (7) is installed on the wall scraping blade (8). The bottom of the wall scraping blade (8) is provided with an inwardly inclined scraping blade (9). A vertical scraper (10) is provided on the wall scraping blade (8), and an inclined scraper (11) is provided on the inclined scraping blade (9). A stabilizing connecting rod (12) is provided between the connecting rod blade (7) located below and the inclined scraping blade (9). The vertical scraper (10) is detachably installed on the wall scraping blade (8) by bolts, and the inclined scraper (11) is detachably installed on the inclined scraping blade (9) by bolts.

3. The polyaluminum chloride stirring and sedimentation system according to claim 1, characterized in that, The disc turbine impeller (6) consists of a mounting disc (13) and a set of turbine blades (14). The mounting disc (13) is mounted on the stirring shaft (2), and the set of turbine blades (14) is evenly distributed in a ring on the mounting disc (13).

4. The polyaluminum chloride stirring and sedimentation system according to claim 1, characterized in that, A stirring base (15) is provided above the discharge port of the reaction vessel (1), and the bottom of the stirring shaft (2) is movably sealed on the stirring base (15). The stirring base (15) consists of a shaft seat and a set of support rods. The bottom of the stirring shaft (2) is installed in the shaft seat, and the shaft seat is installed at the bottom of the reaction vessel (1) through a set of support rods.

5. The polyaluminum chloride stirring and sedimentation system according to claim 1, characterized in that, The outer wall of the reaction vessel (1) is covered with a heat exchange jacket (16); a discharger is installed on the powder inlet (4).

6. The polyaluminum chloride stirring and sedimentation system according to claim 1, characterized in that, The cross-section of the sewage discharge groove (43) is U-shaped. A sewage discharge port is provided at the bottom of one end of the sewage discharge groove (43). The spiral blades of the screw conveyor (42) are located inside the sewage discharge groove (43). The screw conveyor (42) is a shaftless screw conveyor. A pair of branch discharge pipes are provided at the outlet end of the sedimentation inlet pipe (46). The outlet end of the branch discharge pipe is connected to the inner cavity of the sedimentation tank (41).

7. The polyaluminum chloride stirring and sedimentation system according to claim 1, characterized in that, The sedimentation tank (41) is equipped with a bottom baffle (48) and a top baffle (49). The bottom baffle (48) is installed on the settling slope (45), and the top baffle (49) is installed on the inner wall of the sedimentation tank (41). A filtration area (50) is formed between the bottom baffle (48) and the top baffle (49). A flow area is formed between the bottom of the top baffle (49) and the settling slope (45). A supernatant area (51) is formed between the top baffle (49) and the inner wall of the sedimentation tank (41). An upper liquid discharge pipe (47) is installed in the supernatant area (51). A sludge outlet is provided at the bottom of the filtration area (50). A filter screen (52) is provided at the top of the bottom baffle (48).

8. The polyaluminum chloride stirring and sedimentation system according to claim 7, characterized in that, The sedimentation tank body (41) located above the bottom baffle (48) has filter screen mounting slots on both sides of its inner wall, and the filter screen (52) is inserted into a pair of filter screen mounting slots.

9. The polyaluminum chloride stirring and sedimentation system according to claim 1, characterized in that, A baffle plate (53) is installed on the inner wall above the middle part of the sedimentation tank (41), and the baffle plate (53) is inclined toward the sedimentation inlet pipe (46).

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