PAM preparation device for sludge dewatering system

Abstract

The PAM preparation device for the sludge dewatering system comprises a primary preparation tank, a secondary preparation tank, a curing tank, a liquid storage tank and dosing equipment which are cylindrical and are communicated in sequence, the primary preparation tank is overlapped at the top of the liquid storage tank, the secondary preparation tank is overlapped at the top of the curing tank, the primary preparation tank and the secondary preparation tank are attached side by side, and the dosing equipment is connected with the primary preparation tank. The distance between the axis of the first-stage preparation tank and the axis of the liquid storage tank is larger than the radius of the first-stage preparation tank and smaller than the radius of the liquid storage tank, and the distance between the axis of the second-stage preparation tank and the axis of the curing tank is larger than the radius of the second-stage preparation tank and smaller than the radius of the curing tank. By means of the design that the multiple stages of tank bodies are connected in series in a stacked mode, the occupied area can be reduced, the hydrolysis and curing time can be guaranteed, stirring machines can be conveniently arranged to stir all the tank bodies, mixed hydrolysis is achieved, and the mixing uniformity and preparation quality of PAM can be improved by enabling the upper and lower limits of the rotating speed of the stirring machines to be gradually reduced in the PAM flow direction.

Description

Technical Field

[0001] This invention relates to the field of sludge dewatering technology, specifically to a PAM preparation device for a sludge dewatering system. Background Technology

[0002] PAM (polyacrylamide) is a water-soluble linear polymer formed by free radical polymerization of acrylamide monomers. It has good flocculation and water solubility and is an important formulation agent in sludge dewatering systems.

[0003] Most existing PAM preparation devices employ multiple tanks arranged side-by-side for hydrolysis, as disclosed in Chinese patents CN222550673U, CN214131459U, and CN218077606U. Due to the side-by-side arrangement of the tanks, they occupy a large area. To address this issue, a water plant adopted a stacked tank system for PAM preparation. However, the bottom tank of this device lacks space for installing stirring equipment, thus failing to achieve the mixing and hydrolysis function. Furthermore, the total volume of all tanks in this device is 5.2 m³. 3 When all five centrifuges are running at full capacity during winter, the total dosage reaches 6.7m³. 3 / h(see Figure 1 This results in insufficient hydrolysis and ripening time for PAM, leading to a significant increase in pesticide consumption (see...). Figure 2 , 3 Incompletely hydrolyzed PAM will remain in the separation liquid, affecting the normal operation of the entire sludge dewatering system.

[0004] Therefore, it is necessary to provide a PAM preparation device for a sludge dewatering system to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to overcome one or more shortcomings in the prior art and provide a PAM preparation device for sludge dewatering systems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is a PAM preparation device for a sludge dewatering system, comprising a primary preparation tank, a secondary preparation tank, a maturation tank, and a storage tank, all cylindrical and connected in sequence, and a dosing device. The radii of the primary preparation tank and the secondary preparation tank are equal, as are the radii of the maturation tank and the storage tank. The primary preparation tank is stacked on top of the storage tank, and the secondary preparation tank is stacked on top of the maturation tank. The primary and secondary preparation tanks are placed side-by-side, and the maturation tank and the storage tank are placed side-by-side with a gap between them. The first virtual plane formed by the centerline of the secondary preparation tank is parallel to the second virtual plane formed by the centerlines of the curing tank and the storage tank. The distance between the centerline of the primary preparation tank and the centerline of the storage tank is greater than the radius of the primary preparation tank and less than the radius of the storage tank. The distance between the centerline of the secondary preparation tank and the centerline of the curing tank is greater than the radius of the secondary preparation tank and less than the radius of the curing tank. The primary preparation tank, the secondary preparation tank, the curing tank and the storage tank are all equipped with agitators. The upper and lower speed limits of these agitators gradually decrease along the PAM flow direction.

[0007] Preferably, the volumes of the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank are all 2.5 m³. 3 2.5m 3 5m 3 5m 3 The stirring speeds of the agitators on the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank are 200–400 rpm, 100–300 rpm, 50–150 rpm, and 20–100 rpm, respectively.

[0008] Preferably, multiple swirl-blocking plates are fixedly installed on the inner walls of the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank. A liquid level pipe is connected to one side of each of the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank, and an ultrasonic level gauge is installed on the top of the liquid level pipe.

[0009] Preferably, the openings of the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank are all provided with annular overflow troughs. A connecting pipe is installed at the bottom of the annular overflow trough, and the connecting pipe is connected to the tank where the annular overflow trough is located. A control valve is provided on the connecting pipe.

[0010] Preferably, the dosing equipment includes an auger, a storage tank, and a weighing assembly. The auger is located below the storage tank, with one end of the auger sealed to the bottom opening of the storage tank and the other end having a downwardly extending discharge pipe. The storage tank is supported on a frame bracket, and a vibrator is installed at the end of the storage tank near the auger. The weighing assembly is used to receive and weigh the PAM powder delivered by the discharge pipe.

[0011] More preferably, the auger is inclined, and the end of the auger connected to the storage tank is the lower end. The middle part of the auger is supported on the frame bracket. The threaded blades inside the auger are variable pitch threaded blades, and the pitch of the threaded blades gradually decreases from low to high.

[0012] More preferably, the weighing assembly includes a receiving pipe, an annular plate, and a weighing sensor. The receiving pipe is coaxially disposed below the discharge pipe, and a retractable baffle plate is provided at the lower end of the receiving pipe. The annular plate is sleeved on the outer wall of the receiving pipe. The weighing sensor is connected to the bottom wall of the annular plate. There are multiple weighing sensors distributed in a circular array along the center of the annular plate, and the weighing sensors are supported on the frame bracket.

[0013] More preferably, the discharge pipe is a conical structure that opens downwards and outwards, and the receiving pipe is a conical structure that opens upwards and outwards, with the large ends of the two conical structures loosely connected.

[0014] More preferably, one side of the baffle plate is connected to a drive plate for pulling the baffle plate, and a cylinder for driving the drive plate to move, thereby pulling the baffle plate, is provided above the drive plate, and the cylinder body of the cylinder is fixed on the receiving pipe.

[0015] More preferably, an immersion hopper is provided below the weighing component. The immersion hopper has a conical structure, with a water inlet pipe installed at its upper end along the tangent direction of its inner wall, and a Venturi tube vertically connected to its bottom. The end of the Venturi tube is connected to the primary preparation tank.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0017] 1. This utility model, through the design of multi-stage tanks stacked in series, can reduce the floor space, ensure the hydrolysis and maturation time of PAM, and also facilitate the installation of a stirrer to stir each tank, so as to achieve mixed hydrolysis.

[0018] 2. By gradually lowering the upper and lower speed limits of the mixer along the PAM flow direction, this utility model can be combined with the multi-stage tank superimposed series design to improve the mixing uniformity of PAM and achieve stepped treatment, significantly improving the preparation quality of PAM solution and sludge dewatering efficiency. Attached Figure Description

[0019] Figure 1 This is a statistical table of winter hydrolysis and maturation time for the PAM dosing unit in a certain water plant.

[0020] Figure 2 This is a statistical chart of PAM consumption per unit of a water plant's PAM dosing unit over the past three years.

[0021] Figure 3 This is a graph showing the changes in raw water turbidity and PAM consumption in a PAM dosing unit at a water plant.

[0022] Figure 4 This is a schematic diagram of a preferred embodiment of the present invention.

[0023] Figure 5 This is a rear view schematic diagram of a preferred embodiment of the present invention.

[0024] Figure 6 This is a top view of a preferred embodiment of the present invention.

[0025] Figure 7 This is a cross-sectional schematic diagram of a preferred embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the structure of the primary preparation tank and liquid level pipe in a preferred embodiment of this utility model.

[0027] Figure 9 yes Figure 8 A magnified view of a portion of point A in the middle.

[0028] Figure 10 yes Figure 8 A magnified view of a section at point B in the middle.

[0029] Figure 11 This is a schematic diagram of the structure of the dosing device in a preferred embodiment of the present invention.

[0030] Figure 12 yes Figure 11 A magnified view of a section at point C.

[0031] Figure 13 This is a cross-sectional schematic diagram of the dosing device in a preferred embodiment of the present invention.

[0032] Figure 14 yes Figure 13 A magnified view of a portion of the middle baffle plate.

[0033] The components include: 1. Primary preparation tank; 2. Secondary preparation tank; 3. Maturation tank; 4. Storage tank; 5. Dosing equipment; 6. Mixer; 7. Rotary baffle plate; 8. Level pipe; 9. Ultrasonic level gauge; 10. Annular overflow tank; 11. Connecting pipe; 12. Control valve; 13. Auger; 14. Storage tank; 15. Weighing assembly; 151. Receiving pipe; 152. Annular plate; 153. Weighing sensor; 154. Baffle plate; 155. Drive plate; 156. Cylinder; 16. Discharge pipe; 17. Frame support; 18. Vibrator; 19. Immersion hopper; 20. Water inlet pipe; 21. Venturi tube. Detailed Implementation

[0034] like Figures 4 to 14 As shown, the PAM preparation device for the sludge dewatering system provided by this utility model includes a primary preparation tank 1, a secondary preparation tank 2, a maturation tank 3, and a storage tank 4, which are cylindrical and connected in sequence, and a dosing device 5. The radii of the primary preparation tank 1 and the secondary preparation tank 2 are equal, and the radii of the maturation tank 3 and the storage tank 4 are equal. The primary preparation tank 1 and the secondary preparation tank 2 are placed side by side and attached together. The maturation tank 3 and the storage tank 4 are placed side by side and close together with a gap. The primary preparation tank 1 is staggered and stacked on top of the storage tank 4. Specifically, the distance between the centerline of the primary preparation tank 1 and the centerline of the storage tank 4 is greater than that between the primary preparation tank 1 and the storage tank 4. The radius of tank 1 is smaller than that of storage tank 4. Secondary preparation tank 2 is stacked on top of maturation tank 3 in a staggered manner. Specifically, the distance between the axis of secondary preparation tank 2 and the axis of maturation tank 3 is greater than the radius of secondary preparation tank 2 and less than the radius of maturation tank 3. The first virtual plane formed by the axis of primary preparation tank 1 and secondary preparation tank 2 is parallel to the second virtual plane formed by the axis of maturation tank 3 and storage tank 4. Agitators 6 are installed in primary preparation tank 1, secondary preparation tank 2, maturation tank 3 and storage tank 4. The upper and lower speed limits of these agitators 6 gradually decrease along the PAM flow direction.

[0035] The advantage of this setting is that:

[0036] 1. This utility model, through the design of multi-stage tanks stacked in series, can reduce the floor space, ensure the hydrolysis and maturation time of PAM, and also facilitate the installation of a stirrer to stir each tank, so as to achieve mixed hydrolysis.

[0037] 2. By gradually lowering the upper and lower speed limits of the mixer along the PAM flow direction, this utility model can be combined with the multi-stage tank superimposed series design to improve the mixing uniformity of PAM and achieve stepped treatment, significantly improving the preparation quality of PAM solution and sludge dewatering efficiency.

[0038] In this embodiment, the volumes of the primary preparation tank 1, the secondary preparation tank 2, the maturation tank 3, and the storage tank 4 are all 2.5 m³. 3 2.5m 3 5m 3 5m 3The stirring speeds of the agitators 6 on the primary preparation tank 1, secondary preparation tank 2, maturation tank 3, and storage tank 4 are 200–400 rpm, 100–300 rpm, 50–150 rpm, and 20–100 rpm, respectively. During use, the reagent (PAM) is first added to the primary preparation tank 1 and stirred to initiate mixing. During this mixing process, the reagent is continuously added to the primary preparation tank 1. A portion of the mixed reagent from the primary preparation tank 1 enters the secondary preparation tank. In tank 2, the secondary preparation tank 2 mixes the reagent a second time. The mixed reagent enters the maturation tank 3 for maturation. After maturation, the reagent enters the storage tank 4 for storage. During the preparation of the reagent, all four agitators 6 keep running. The agitator in the storage tank 4 must keep running at all times. Even when the primary preparation tank 1, secondary preparation tank 2 and primary maturation tank 3 are stopped, the agitator 6 in the storage tank 4 will keep rotating to stir the liquid in the storage tank 4 and keep the solution dynamically uniform.

[0039] This sludge dewatering system uses a PAM preparation unit that, through tank modification, series design, and optimized volume configuration, achieves a total volume of 15m³. 3 (Effective total volume: 14.5m³) 3 Under the condition that the dosage remains unchanged (the total demand for 5 centrifuges operating at full load in winter is approximately 6.7m), 3 / h), the maturation time T of the PAM solution (representing the average time from the time the newly added reagent solution enters the tank to the time it is extracted) ≥ 2h, specifically, T = Q / V = 14.5m 3 / 6.7m 3 / h≈2.16h, where V: represents the total amount of reagent solution that can be contained in the tank, and Q: represents the amount of solution extracted from the tank per hour. This ensures that the PAM hydrolysis and maturation time is sufficient to fully complete the hydrolysis reaction, thereby improving the activity of the reagent. This solves the problem of reduced efficacy caused by insufficient maturation time in existing equipment and is beneficial to the normal operation of the entire sludge dewatering system.

[0040] In this embodiment, multiple swirl-blocking plates 7 are fixedly installed on the inner walls of the primary preparation tank 1, secondary preparation tank 2, maturation tank 3, and storage tank 4. The swirl-blocking plates 7 can eliminate the dead zone of stirring, making the mixing of the reagents more thorough and uniform. At the same time, a liquid level pipe 8 is connected to one side of each of the primary preparation tank 1, secondary preparation tank 2, maturation tank 3, and storage tank 4. An ultrasonic liquid level gauge 9 is installed on the top of the liquid level pipe 8. The ultrasonic liquid level gauge 9 is electrically connected to the controller to monitor the water level of each tank in real time, thereby controlling the amount of water and medicine entering the tank, starting at low and stopping at high. At the same time, it also makes the low and high levels adjustable, which is convenient to adjust the range of the detected liquid level at any time.

[0041] Furthermore, the openings of the primary preparation tank 1, secondary preparation tank 2, maturation tank 3, and storage tank 4 are all equipped with annular overflow troughs 10 with the same structure. The following description takes the primary preparation tank 1 as an example. A connecting pipe 11 is installed at the bottom of the annular overflow trough 10. The connecting pipe 11 is connected to the tank (primary preparation tank 1) where the annular overflow trough 10 is located. A control valve 12 is provided on the connecting pipe 11. The annular overflow trough 10 can collect the overflowing liquid and return it to the corresponding tank (primary preparation tank 1) through the connecting pipe 11 to prevent the liquid from flowing to the ground.

[0042] In this embodiment, the dosing device 5 includes an auger 13, a storage tank 14, and a weighing assembly 15. The auger 13 is located below the storage tank 14. One end of the auger 13 is sealed to the bottom opening of the storage tank 14, and the other end is provided with a downwardly extending discharge pipe 16. The storage tank 14 is supported on a frame bracket 17. A vibrator 18 is installed at the end of the storage tank 14 near the auger 13. The weighing assembly 15 is used to receive the PAM powder delivered by the discharge pipe 16 and weigh it.

[0043] Specifically, the auger 13 is inclined, and the end of the auger 13 connected to the storage tank 14 is the lower end. The middle part of the auger 13 is supported on the frame bracket 16. The threaded blades 131 inside the auger 13 are variable pitch threaded blades, and the pitch of the threaded blades 131 gradually decreases from the lower end (closer to the storage tank 14) to the higher end (away from the storage tank 14). Figure 9 The helical blades are only a schematic diagram and do not represent the actual pitch. By using the variable pitch threaded blades 131 of the auger 13, and in conjunction with the vibrator 18 installed on the storage tank 14 near the auger 13, the "rat hole" phenomenon can be eliminated when conveying PAM agents, ensuring the continuity of material feeding.

[0044] The weighing assembly 15 includes a receiving pipe 151, an annular plate 152, and a weighing sensor 153. The receiving pipe 151 is coaxially arranged below the discharge pipe 16. The lower end of the receiving pipe 151 is provided with a pull-out baffle plate 154. The baffle plate 154 can close the bottom opening of the receiving pipe 151, thereby cutting off the material discharge channel of the receiving pipe 151. The annular plate 152 is sleeved on the outer wall of the receiving pipe 151. The weighing sensor 153 is connected to the bottom wall of the annular plate 152. There are multiple weighing sensors 153, which are arranged in a ring array along the center of the annular plate 152. The multiple weighing sensors 153 are all supported on the frame bracket 17. Through the ring array layout of the weighing sensors 153, a closed force ring can be formed to eliminate the eccentric error caused by single-point weighing.

[0045] In this embodiment, a wetting hopper 19 is provided below the weighing assembly 15. The wetting hopper 19 is a conical structure that opens upward and outward. A water inlet pipe 20 is installed at the upper end along the tangent direction of the inner wall, and a venturi tube 21 is vertically connected to the bottom. The end of the venturi tube 21 is connected to the primary preparation tank 1. In use, the PAM agent in the storage tank 14 is transported to the weighing assembly 15 for weighing through the auger 13 and the discharge pipe 16. The weighed agent enters the wetting hopper 12 for preliminary mixing, and the preliminarily mixed agent is transported to the primary preparation tank 1 through the venturi tube 21.

[0046] Specifically, when the water in the inlet pipe 20 enters the impregnation hopper 19 tangentially, it forms a spiraling downward flow field. The reagent (PAM powder) falling into this flow field is broken down into fine particles by the high-speed rotating water flow, preventing large particles from accumulating. The fine particles are drawn into the center of the water flow and evenly dispersed. Because the water flow is spiraling downwards, the reagent does not accumulate in one place but mixes and sinks simultaneously, ensuring that each PAM particle is fully in contact with the water. Furthermore, when the mixture flows out from the bottom of the impregnation hopper 19, it enters the narrow throat of the venturi tube 21. Due to the Venturi effect, the flow velocity of the mixture increases sharply in the throat, forming a local negative pressure zone, which automatically draws the mixture in the impregnation tank 19, forming a continuous circulation mixing effect, ensuring that the reagent concentration is always uniform, making full use of the fluid's own kinetic energy to achieve mixing, reducing energy consumption and preventing particle deposition. When the mixture reaches the outlet of the Venturi tube 21, the flow velocity of the mixture can be reduced through the diffuser section at the outlet of the Venturi tube 21, making the flow velocity of the mixture more stable and restoring the pressure, ensuring that the mixture can be stably delivered to the primary preparation tank 1.

[0047] In this embodiment, a drive plate 155 for pulling the baffle plate 154 is connected to one side of the baffle plate 154. A cylinder 156 is provided above the drive plate 155 to drive the drive plate 155 to move, thereby pulling the baffle plate 154 to open or close the bottom opening of the receiving pipe 151. The cylinder body of the cylinder 156 is fixed on the receiving pipe 151. When the cylinder 156 moves to move the drive plate 155 and drive the baffle plate 154 to cut off the discharge channel of the receiving pipe 151, the PAM agent discharged from the discharge pipe 16 can be completely retained in the receiving pipe 151, and the weighing assembly 15 can complete the weighing operation. After completion, cylinder 156 reverses its movement, causing drive plate 155 to pull out baffle plate 154, allowing the reagent in receiving pipe 151 to smoothly enter impregnation hopper 19. It should be noted that cylinder 156 is electrically connected to PLC via solenoid valve. PLC can control cylinder 156 to operate by starting and stopping solenoid valve. At the same time, a flat slot is provided on the wall of receiving pipe 151, and baffle plate 154 can be inserted into the flat slot. When drive plate 155 pulls out baffle plate 154, a part of baffle plate 154 is located in the flat slot, and this part of baffle plate 154 will not cause any blockage to receiving pipe 151.

[0048] In this embodiment, the discharge pipe 16 is a conical structure that opens downward and outward, and the receiving pipe 151 is a conical structure that opens upward and outward. The large ends of these two conical structures are loosely connected. This design ensures that even if the medicine inside the receiving pipe 151 is piled up to a certain height, it will not easily come into contact with the discharge pipe 16. Combined with the loose connection design, the accuracy of the weighing component 15 during weighing can be guaranteed.

[0049] It should be noted that the drive unit of the auger 13 and the weighing sensor 153 are both connected to the PLC. When feeding is required, the PLC controls the baffle plate 154 to cut off the receiving pipe 151 and starts the auger 13 to add the agent (PAM powder) to the weighing component 15. The weighing sensor 153 weighs the agent in real time. When the weight of the agent reaches the set value, the PLC controls the auger 13 to stop running and pulls out the baffle plate 154 through the action of the cylinder 156, so that the agent in the receiving pipe 151 enters the impregnation hopper 19 and is finally transported to the primary preparation tank 1. The feeding error of this dosing equipment 5 is ≤±1%. The entire feeding process does not require manual intervention and the operation is simpler and more convenient.

[0050] When the PAM preparation device for the sludge dewatering system provided by this utility model is working, the reagent (PAM powder) is first output through the storage tank 14 of the dosing device 5, and then conveyed to the weighing component 15 for precise measurement by the variable pitch screw conveyor 13. The weighed reagent falls into the impregnation hopper 19, where it forms a spiral flow field with the high-speed water flow entering in the tangential direction and is fully mixed. After the mixture is further enhanced by the negative pressure at the throat of the Venturi tube 21, it enters the primary preparation tank 1 for initial stirring (stirrer speed 200-400 rpm). During this process, new reagent is continuously added, and part of the mixture overflows to the secondary preparation tank 2 for secondary mixing (stirrer speed 100-300 rpm). The solution after two stages of mixing flows into the maturation tank 3 (stirrer speed 50-150 rpm) to complete the hydrolysis reaction, and finally enters the storage tank 4 (stirrer speed 20-100 rpm) for storage and later use. The entire system uses ultrasonic level gauges 9 to monitor the liquid level in each tank in real time, ensuring that the residence time of the solution in each tank meets the process requirements (especially the maturation tank 3, which guarantees ≥2 hours). The swirling baffles 7 eliminate the stirring dead zone, while the continuous stirring in the storage tank 4 maintains the stability of the reagent's activity during storage. This stepped processing flow, combined with a precise automatic control system, effectively solves the problems of insufficient maturation time and uneven mixing in existing equipment, significantly improving the preparation quality of PAM solution and the efficiency of sludge dewatering.

[0051] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A PAM preparation device for a sludge dewatering system, comprising a primary preparation tank, a secondary preparation tank, a maturation tank, and a storage tank, all cylindrical and connected in sequence, and a dosing device, wherein the radii of the primary preparation tank and the secondary preparation tank are equal, and the radii of the maturation tank and the storage tank are equal, characterized in that: The primary preparation tank is stacked on top of the storage tank, and the secondary preparation tank is stacked on top of the maturation tank. The primary and secondary preparation tanks are placed side by side and close together, while the maturation tank and the storage tank are placed side by side and close together with a gap. The first virtual plane formed by the centerlines of the primary and secondary preparation tanks is parallel to the second virtual plane formed by the centerlines of the maturation tank and the storage tank. The distance between the centerline of the primary preparation tank and the centerline of the storage tank is greater than the radius of the primary preparation tank but less than the radius of the storage tank. The distance between the centerline of the secondary preparation tank and the centerline of the maturation tank is greater than the radius of the secondary preparation tank but less than the radius of the maturation tank. The primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank are all equipped with agitators. The upper and lower speed limits of these agitators gradually decrease along the PAM flow direction.

2. The PAM preparation device for the sludge dewatering system according to claim 1, characterized in that: The volumes of the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank are all 2.5 m³. 3 2.5m 3 5m 3 5m 3 The stirring speeds of the agitators on the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank are 200–400 rpm, 100–300 rpm, 50–150 rpm, and 20–100 rpm, respectively.

3. The PAM preparation device for the sludge dewatering system according to claim 1, characterized in that: Multiple swirl-blocking plates are fixedly installed on the inner walls of the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank. A liquid level pipe is connected to one side of each of the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank, and an ultrasonic liquid level gauge is installed on the top of the liquid level pipe.

4. The PAM preparation device for the sludge dewatering system according to claim 1, characterized in that: The openings of the primary preparation tank, the secondary preparation tank, the maturation tank, and the storage tank are all provided with annular overflow troughs. A connecting pipe is installed at the bottom of the annular overflow trough, and the connecting pipe is connected to the tank where the annular overflow trough is located. A control valve is provided on the connecting pipe.

5. The PAM preparation device for the sludge dewatering system according to claim 1, characterized in that: The dosing equipment includes an auger, a storage tank, and a weighing assembly. The auger is located below the storage tank, with one end of the auger sealed to the bottom opening of the storage tank and the other end having a downward-extending discharge pipe. The storage tank is supported on a frame bracket, and a vibrator is installed at the end of the storage tank near the auger. The weighing assembly is used to receive and weigh the PAM powder delivered by the discharge pipe.

6. The PAM preparation device for the sludge dewatering system according to claim 5, characterized in that: The auger is tilted, and the end of the auger connected to the storage tank is the lower end. The middle part of the auger is supported on the frame bracket. The threaded blades inside the auger are variable pitch threaded blades, and the pitch of the threaded blades gradually decreases from low to high.

7. The PAM preparation device for the sludge dewatering system according to claim 5, characterized in that: The weighing assembly includes a receiving pipe, an annular plate, and a weighing sensor. The receiving pipe is coaxially arranged below the discharge pipe. A retractable baffle plate is provided at the lower end of the receiving pipe. The annular plate is sleeved on the outer wall of the receiving pipe. The weighing sensor is connected to the bottom wall of the annular plate. There are multiple weighing sensors, which are arranged in a circular array along the center of the annular plate. The weighing sensors are supported on the frame bracket.

8. The PAM preparation device for the sludge dewatering system according to claim 7, characterized in that: The discharge pipe is a conical structure that opens downwards and outwards, and the receiving pipe is a conical structure that opens upwards and outwards. The large ends of these two conical structures are loosely connected.

9. The PAM preparation device for the sludge dewatering system according to claim 7, characterized in that: One side of the baffle plate is connected to a drive plate for pulling the baffle plate. Above the drive plate is a cylinder for driving the drive plate to move, thereby pulling the baffle plate. The cylinder body is fixed on the receiving pipe.

10. The PAM preparation device for the sludge dewatering system according to claim 5, characterized in that: Below the weighing assembly is an immersion hopper, which has a conical structure. A water inlet pipe is installed at the upper end of the hopper along the tangent of the inner wall, and a Venturi tube is vertically connected to the bottom of the hopper. The end of the Venturi tube is connected to the primary preparation tank.

Images