A flocculation device for sludge treatment

Abstract

This utility model relates to the technical field of sludge treatment devices, and more particularly to a flocculation device for sludge treatment, comprising: a flocculation chamber, a dosing pipe, a drive device, a stirring shaft, a stirring impeller, a cooling device, and a mechanical seal. The flocculation chamber has an open structure on both sides, with one side being a sludge inlet and the other side being a sludge outlet. A dosing pipe and an installation cavity are located at the top of the flocculation chamber, and an isolation plate is installed at the bottom of the installation cavity. The mechanical seal is fixed to the isolation plate. The stirring shaft passes through the mechanical seal and extends through the installation cavity. One end of the stirring shaft is connected to the drive device, and the other end is connected to the stirring impeller, which is located within the flocculation chamber. The mechanical seal is connected to the cooling device. In this utility model, a dosing pump delivers PAM solution to the flocculation chamber through the dosing pipe, where it is thoroughly flocculated and mixed with the sludge under the action of a high-speed stirrer. The mechanical seal within the flocculation chamber prevents sludge leakage.

Description

Technical Field

[0001] This utility model relates to the technical field of sludge treatment devices, and in particular to a flocculation device for sludge treatment. Background Technology

[0002] The residual sludge from urban wastewater treatment plants has a loose structure. When it enters a belt thickener filter press for dewatering, it must first be flocculated and mixed with polyacrylamide (PAM), an organic polymer. The principle is to add PAM flocculant to sludge with a moisture content of 99.2-99.8%. Through adsorption and bridging, PAM agglomerates unstable, dispersed sludge particles into larger flocs, achieving sludge-water separation. The flocs are then dewatered under pressure by the belt thickener filter press. The flocculant needs to be installed on the pipeline from the sludge lift pump to the belt thickener filter press inlet, but traditional flocculants are not suitable for installation on pipelines. Secondly, the flocculant requires agitation, necessitating a motor. Since the motor passes through the outer wall of the flocculant, sludge leakage must be prevented. If a seal is used, the motor shaft will rub against the seal, causing heat generation and affecting agitation efficiency. Summary of the Invention

[0003] This utility model provides a flocculation device for sludge treatment, which solves the technical problems mentioned in the background art, so that the flocculation device for sludge treatment is applicable to sludge treatment.

[0004] The technical solution of this utility model is as follows: A flocculation device for sludge treatment, comprising: a flocculation chamber, a dosing pipe, a drive device, a stirring shaft, a stirring impeller, a cooling device, and a mechanical seal; The flocculation chamber is designed with open structures on both sides, with a sludge inlet on one side and a sludge outlet on the other. The top of the flocculation chamber is provided with a dosing pipe and an installation cavity. The bottom of the installation cavity is provided with an isolation plate. The mechanical seal is fixed on the isolation plate. The stirring shaft passes through the mechanical seal and extends through the installation cavity. One end of the stirring shaft is connected to the drive device, and the other end of the stirring shaft is connected to the stirring impeller. The stirring impeller is located in the flocculation chamber. The mechanical seal is connected to a cooling device.

[0005] Furthermore, the dosing pipe is disposed between the sludge inlet and the agitator impeller, and the tail end of the dosing pipe is bent toward the agitator impeller.

[0006] Furthermore, the flocculation chamber is equipped with connecting flanges at the sludge inlet and sludge outlet.

[0007] Furthermore, the cooling device includes an inlet pipe, a return pipe, a water tank, and a circulating water pump. One end of the inlet pipe is connected to the circulating water pump and placed inside the water tank. The other end of the inlet pipe is connected to the coolant inlet of a mechanical seal. The coolant outlet of the mechanical seal is connected to one end of the return pipe, and the other end of the return pipe is located in the water tank.

[0008] Furthermore, the circulating water pump is located at the bottom of the water tank, and the other end of the return water pipe is located at the top of the water tank.

[0009] Furthermore, the driving device is a variable frequency motor.

[0010] Furthermore, the stirring impeller is a conical impeller.

[0011] The beneficial effects of this invention are as follows: This invention uses a dosing pump (with a pressure rating higher than that of a sludge pump) to deliver PAM solution through a dosing pipe to the flocculation chamber, where it is thoroughly flocculated and mixed with the sludge under the action of a high-speed agitator. The flocculation chamber is equipped with a mechanical seal to prevent sludge leakage.

[0012] This utility model is a cooling device consisting of a water tank, a circulating water pump, and a cooling water circuit. It can effectively solve the heat generation problem, lubricate the friction pairs, and ensure the stable operation of the flocculant.

[0013] This invention enables high-speed flocculation of sludge, and the flocculation speed can be adjusted according to changes in the amount and moisture content of the sludge fed into the system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the flocculation device for sludge treatment according to this utility model.

[0015] Figure 2 This is a schematic diagram of the drive unit.

[0016] Figure 3 This is a schematic diagram of the flocculation chamber.

[0017] Figure 4 This is a schematic diagram of the cooling device. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0019] In the technical solution of this utility model, Figure 1 This is a structural diagram illustrating the specific structure of a flocculation device for sludge treatment according to the present invention, as shown below. Figure 1 As shown, it includes a flocculation chamber 1, a dosing pipe 2, a drive device 3, a stirring shaft 4, a stirring impeller 5, a cooling device 6, and a mechanical seal 7; The flocculation chamber 1 is configured with an open structure on both sides, with a sludge inlet 11 on one side and a sludge outlet 12 on the other side. The top of the flocculation chamber 1 is provided with a dosing pipe 2 and an installation cavity 13. The bottom of the installation cavity 13 is a partition plate 131, which separates the installation cavity 13 from the flocculation chamber 1.

[0020] The mechanical seal 7 is fixed to the isolation plate 131, such that the upper part of the mechanical seal 7 is located in the mounting cavity 13, and the lower part is located in the flocculation cavity 1. The stirring shaft 4 passes through the mechanical seal 7 and extends through the mounting cavity 13. One end of the stirring shaft 4 is connected to the drive device 3, and the other end is connected to the stirring impeller 5. The stirring impeller 5 is disposed in the flocculation cavity 1. The mechanical seal 7 is connected to the cooling device 6. The drive device 3 is installed above the mounting cavity 13.

[0021] The drive unit 3 is a variable frequency motor. The stirring impeller 5 is a conical impeller. (See attached image) Figure 2 As shown, the variable frequency motor is connected to the stirring shaft 4, driving the conical high-speed impeller fixed on the stirring shaft 4 to rotate at high speed, with a maximum speed of 1000 rpm. The conical high-speed impeller is a non-metallic hollow impeller, which is lightweight and operates stably.

[0022] In one embodiment of this technical solution, the dosing pipe 2 is disposed between the sludge inlet 11 and the agitator impeller 5, and the tail end of the dosing pipe 2 is bent toward the agitator impeller 5. The head end of the dosing pipe 2 is connected to a dosing pump, which provides PAM solution at a pressure greater than that of the sludge pump output pipe.

[0023] The flocculation chamber 1 is equipped with connecting flanges 14 at the sludge inlet 11 and sludge outlet 12.

[0024] As attached Figure 3 As shown, flanges are installed on the left and right sides of the cavity, connecting to the sludge pump output pipe and the belt thickener filter press inlet pipe, respectively. A variable frequency motor is installed at the top of the cavity. A mechanical seal 7 is installed in the middle of the cavity 13 to isolate the flocculation cavity 1 from the outside environment and prevent sludge leakage. High-pressure (P maximum = 16 bar) PAM liquid reagent pumped by the dosing pump is sprayed out through the dosing pipe 2 and enters the flocculation cavity 1. Under the action of the conical high-speed impeller, it reacts instantaneously with the sludge in the cavity to form large flocs, achieving sludge-water separation.

[0025] In one embodiment of this technical solution, the cooling device 6 includes an inlet pipe 61, a return pipe 62, a water tank 63, and a circulating water pump 64. One end of the inlet pipe 61 is connected to the circulating water pump 64 and placed inside the water tank 63. The other end of the inlet pipe 61 is connected to the coolant inlet of the mechanical seal 7. The coolant outlet of the mechanical seal 7 is connected to one end of the return pipe 62. The other end of the return pipe 62 is disposed in the water tank 63.

[0026] Specifically, the circulating water pump 64 is located at the bottom of the water tank 63, and the other end of the return water pipe 62 is located at the top of the water tank 63.

[0027] As attached Figure 4 As shown, the cooling water in the water tank 63 is lifted by the circulating water pump 64, enters the mechanical seal 7 through the inlet pipe 61, and then returns to the water tank 63 through the return pipe 62. The cooling circulating water carries away the heat generated by the friction between the stirring shaft 4 and the mechanical seal 7 when they rotate at high speed, and forms a water film on the friction surface between the stirring shaft 4 and the mechanical seal 7, which plays a lubricating role.

[0028] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A flocculation device for sludge treatment, characterized in that, include: Flocculation chamber (1), dosing pipe (2), drive device (3), stirring shaft (4), stirring impeller (5), cooling device (6) and mechanical seal (7); The flocculation chamber (1) is configured with an open structure on both sides, with a sludge inlet (11) on one side and a sludge outlet (12) on the other side. The top of the flocculation chamber (1) is provided with a dosing pipe (2) and an installation cavity (13). The bottom of the installation cavity (13) is provided with an isolation plate (131). The mechanical seal (7) is fixed on the isolation plate (131). The stirring shaft (4) passes through the mechanical seal (7) and the stirring shaft (4) passes through the installation cavity (13). One end of the stirring shaft (4) is connected to the driving device (3), and the other end of the stirring shaft (4) is connected to the stirring impeller (5). The stirring impeller (5) is located in the flocculation chamber (1). The mechanical seal (7) is connected to the cooling device (6).

2. The flocculation device for sludge treatment as described in claim 1, characterized in that, The dosing pipe (2) is located between the sludge inlet (11) and the stirring impeller (5), and the tail end of the dosing pipe (2) is bent toward the stirring impeller (5).

3. The flocculation device for sludge treatment as described in claim 1, characterized in that, The flocculation chamber (1) is provided with connecting flanges (14) at the sludge inlet (11) and sludge outlet (12).

4. The flocculation device for sludge treatment as described in claim 1, characterized in that, The cooling device (6) includes an inlet pipe (61), a return pipe (62), a water tank (63), and a circulating water pump (64). One end of the inlet pipe (61) is connected to the circulating water pump (64) and placed inside the water tank (63). The other end of the inlet pipe (61) is connected to the coolant inlet of the mechanical seal (7). The coolant outlet of the mechanical seal (7) is connected to one end of the return pipe (62). The other end of the return pipe (62) is placed in the water tank (63).

5. The flocculation device for sludge treatment as described in claim 4, characterized in that, The circulating water pump (64) is located at the bottom of the water tank (63), and the other end of the return water pipe (62) is located at the top of the water tank (63).

6. The flocculation device for sludge treatment as described in claim 1, characterized in that, The drive device (3) is a variable frequency motor.

7. The flocculation device for sludge treatment as described in claim 1, characterized in that, The stirring impeller (5) is a conical impeller.

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