Sludge mixing conditioning device with combined stirring blades

Abstract

The present application relates to the technical field of sludge treatment, in particular to a sludge mixing and conditioning device with combined stirring blades, comprising: a tank body, a stirring mechanism, a chemical feeding mechanism and a sludge outlet mechanism; the tank body is vertically arranged, and a sludge outlet is arranged at the bottom of the tank body; the sludge outlet mechanism is arranged at the sludge outlet; the chemical feeding mechanism has an inlet connected with a chemical feeding pump and a plurality of chemical feeding outlets, and the chemical feeding outlets are distributed along the circumference of the top of the tank body; through the synergistic effect of the three of the multi-point circumferential distribution of the chemical feeding structure, the combined stirring blades with the dual functions of upward material lifting and sidewall scraping, and the sludge outlet mechanism cooperating with the stirring shaft, efficient and uniform mixing of the sludge and the chemicals is realized, the sludge wall sticking and bottom deposition are effectively prevented, and smooth sludge outlet is ensured.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and more specifically to a sludge mixing and conditioning device with combined stirring blades. Background Technology

[0002] With increasingly stringent environmental protection requirements, sludge treatment and disposal have become a key focus of environmental governance. In the sludge dewatering process, sludge conditioning is a crucial pretreatment step. Its purpose is to change the binding state of water in the sludge by adding chemicals and mixing them evenly, thereby improving the efficiency of subsequent dewatering.

[0003] Existing sludge conditioning devices typically use a single-layer impeller or a single spiral blade as the mixing structure, and operate using a single-point dosing method. However, in actual operation, these devices suffer from the following technical drawbacks:

[0004] Firstly, in the dosing and mixing stage, single-point dosing means that the reagent is injected from only one location at the top of the tank, and the reagent diffuses throughout the tank due to the agitation of the stirring blades. Because sludge has high viscosity and poor fluidity, the reagent concentration is often too high near the dosing point, while the concentration is insufficient in areas far from the dosing point, creating a significant concentration gradient. This not only causes localized overdosing of reagents and underdosing in other areas, increasing reagent consumption costs, but also directly reduces the dewatering efficiency of subsequent filter press.

[0005] Secondly, for sludge with high water content and high viscosity, the flow field generated by a single-layer impeller is mainly radial and circumferential, lacking forced axial circulation. Sludge easily deposits at the bottom of the tank, forming a dead zone for mixing. At the same time, the high viscosity of sludge makes it very easy to adhere to the inner wall of the tank. As the operating time increases, the wall adhesion layer will gradually thicken and dry into lumps, not only occupying the effective volume of the tank, but also causing blockage accidents if it falls off and enters the sludge outlet.

[0006] Third, traditional sludge outlet designs are mostly simple circular openings, relying on the sludge to flow out by gravity. However, sludge is prone to bridging or clumping at the outlet, requiring manual unblocking and severely impacting the efficiency of continuous operation.

[0007] Fourth, the existing stirring blades have a relatively simple function and cannot simultaneously solve the problems of bottom sludge turning over and side wall scraping, making it difficult to meet the conditioning needs of sludge with high water content or high viscosity. Summary of the Invention

[0008] In order to solve the above-mentioned technical problems, the present invention provides a sludge mixing and conditioning device with combined stirring blades, which realizes rapid and uniform mixing of agents and sludge, eliminates sedimentation at the bottom of the tank and adhesion to the tank wall, and ensures smooth sludge discharge and prevents blockage.

[0009] This invention is achieved through the following technical solution:

[0010] A sludge mixing and conditioning device with combined stirring blades includes: a tank, a stirring mechanism, a dosing mechanism, and a sludge discharge mechanism; the tank is vertically arranged and has a sludge discharge port at its bottom, and the sludge discharge mechanism is arranged at the sludge discharge port; the dosing mechanism has an inlet connected to a chemical delivery pump and multiple dosing outlets, and the multiple dosing outlets are distributed circumferentially at intervals along the top of the tank.

[0011] The stirring mechanism includes a drive device, a stirring shaft, and combined stirring blades. The stirring shaft is vertically arranged inside the tank and is connected to the drive device for transmission.

[0012] The combined stirring blades include multiple sets of blade units spaced apart along the axial direction of the stirring shaft. Each set of blade units includes a first type of blade and a second type of blade. The first type of blade and the second type of blade are arranged at a set angle in the circumferential direction of the stirring shaft.

[0013] The first type of blade has a connecting part and a working part. The connecting part is fixed to the stirring shaft, and the working part extends obliquely upward relative to the axis of the stirring shaft.

[0014] The second type of blade has vertical ribs and connecting ribs. The vertical ribs are located on both sides of the stirring shaft, and the connecting ribs connect the vertical ribs and the stirring shaft. The outer edge of the vertical ribs has a predetermined radial distance from the inner wall of the tank.

[0015] Optionally, the first type of blade is made of angle steel, one end of which forms the connecting part and is welded and fixed to the stirring shaft, and one right-angled side of the angle steel forms the working part, which forms a preset angle with the rotating cone surface.

[0016] Optionally, the first type of blade further includes reinforcing ribs, which are inclined and connected at both ends to the connecting portion and the stirring shaft, respectively.

[0017] Optionally, the angle steel is an equilateral angle steel, and the specifications of the angle steel are from 60mm×60mm×6mm to 100mm×100mm×10mm;

[0018] The angle between the working part and the axis of the stirring shaft is 30 degrees to 60 degrees.

[0019] Optionally, the second type of blade further includes transverse ribs, which are respectively connected to the upper and lower ends of the vertical ribs on both sides, and the vertical ribs and the transverse ribs form a rectangular frame structure;

[0020] The stirring shaft passes through the center of the rectangular frame, and the connecting rib is a rib plate that fixes the rectangular frame to the stirring shaft.

[0021] Optionally, both the vertical and horizontal reinforcing bars are made of flat steel, with a width of 60mm to 100mm and a thickness of 6mm to 10mm; the height of the rectangular frame is adapted to the height of the tank body.

[0022] The radial distance between the outer edge of the vertical rib and the inner wall of the tank is 5mm to 6mm.

[0023] Optionally, the combined stirring blades include 3 to 6 sets of blade units spaced apart along the axial direction of the stirring shaft, with equal axial spacing between adjacent sets of blade units;

[0024] In each set of blade units, the first type of blade and the second type of blade are arranged at a 90-degree angle to each other in the circumferential direction of the stirring shaft.

[0025] Optionally, the lower diameter of the tank gradually narrows to form a conical guide section, the large end of the conical guide section is connected to the main body of the tank, and the small end of the conical guide section is connected to the mud outlet;

[0026] The cone angle of the conical guide section is 30 to 60 degrees, and the mud outlet is set vertically downward.

[0027] Optionally, the dosing mechanism includes a main dosing pipe, a five-way connector, and four branch pipes. The main dosing pipe is connected to the four branch pipes through the five-way connector. The outlets of the four branch pipes are evenly distributed on the same circumference of the top of the tank as multiple dosing outlets. The axes of the four dosing outlets are parallel to the axis of the tank or at a set angle to the axis of the tank.

[0028] Optionally, the sludge discharge mechanism includes a screw pump, the inlet of which is connected to the sludge discharge port.

[0029] This invention achieves efficient and uniform mixing of sludge and chemicals, effectively prevents sludge from sticking to the walls and depositing at the bottom, and ensures smooth sludge discharge through the synergistic effect of a multi-point circumferentially distributed dosing structure, a combined stirring blade that functions as both upward lifting and side wall scraping, and a sludge discharge mechanism that works in conjunction with the stirring shaft. Compared with existing technologies, it has the following advantages:

[0030] By setting multiple dosing outlets at intervals along the circumference on the top of the tank, the agent is added into the tank simultaneously from multiple points, avoiding the problems of excessively high local concentration and insufficient concentration in distant areas caused by traditional single-point dosing, and improving the uniformity of mixing of agent and sludge.

[0031] By setting up a combined stirring blade consisting of a first type of blade and a second type of blade, the working part of the first type of blade extends obliquely upward relative to the stirring shaft axis, and continuously lifts the sludge at the bottom of the tank when the stirring shaft rotates, pushing the sludge to form an axial circulation flow from bottom to top in the tank, effectively eliminating bottom sedimentation and stirring dead zones; the outer edge of the vertical ribs of the second type of blade maintains a predetermined radial distance from the inner wall of the tank, and scrapes off the sludge adhering to the tank wall in real time during the rotation of the stirring shaft, preventing the sludge from staying on the wall surface for a long time and forming dry clumps, which not only ensures the effective volume of the tank, but also avoids the clumps on the wall surface falling off and blocking the sludge outlet. Attached Figure Description

[0032] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, but do not constitute a limitation on the embodiments of the present invention.

[0033] Figure 1 This is a schematic diagram of the sludge mixing and conditioning device with combined stirring blades according to the present invention.

[0034] Figure 2 This is a schematic diagram of the dosing mechanism according to the present invention.

[0035] Figure 3 This is a front view schematic diagram of a sludge mixing and conditioning device with combined stirring blades according to the present invention.

[0036] Figure 4 This is a partial structural schematic diagram of the stirring mechanism according to the present invention.

[0037] Reference numerals: 1-Tank body; 2-Conical guide section; 3-Sludge outlet; 4-Dosing mechanism; 5-Main inlet pipe; 6-Five-way pipe; 7-Branch pipe; 8-Drive device; 9-Agitator shaft; 10-Sludge outlet mechanism; 11-Combined agitator blades; 12-First type of blade; 13-Connecting part; 14-Working part; 15-Reinforcing rib; 16-Second type of blade; 17-Vertical rib; 18-Connecting rib; 19-Transverse rib. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0039] It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0040] Where there is no conflict, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] like Figure 1 and Figure 3 As shown, this embodiment provides a sludge mixing and conditioning device with combined stirring blades, including a tank 1, a stirring mechanism, a dosing mechanism 4, and a sludge discharge mechanism 10.

[0043] The tank 1 is vertically positioned and serves as a container for mixing and conditioning sludge with chemicals. A sludge outlet 3 is located at the bottom of the tank 1, and a sludge discharge mechanism 10 is installed at the outlet 3 to guide the conditioned sludge from the tank 1 to subsequent filter press equipment. The tank 1 can be made of 304 stainless steel, and its inner wall can be further treated with anti-corrosion measures according to the corrosiveness of the sludge being treated, extending its service life.

[0044] In addition, the lower diameter of the tank body 1 gradually narrows to form a conical guide section 2. The larger end of the conical guide section 2 is connected to the main body of the tank body 1, and the smaller end of the conical guide section 2 is connected to the sludge outlet 3. The cone angle of the conical guide section 2 is 30 to 60 degrees, and the sludge outlet 3 is set vertically downward. The conical guide section 2 allows the sludge in the tank body 1 to naturally collect along the inclined wall towards the sludge outlet 3 under the action of gravity, thus playing a role in guiding the flow and preventing bridging.

[0045] When the cone angle is relatively large, close to 60 degrees, the cone surface is relatively steep, and the sludge slides down quickly, which is suitable for sludge with good fluidity and low viscosity. When the cone angle is relatively small, close to 30 degrees, the cone surface is relatively gentle, and the sludge slides down slowly, which helps to prevent high-viscosity sludge from clogging at the sludge outlet 3 due to excessive instantaneous flow. The height of the conical guide section 2 is about 600mm to 800mm, and it transitions smoothly with the main body of the tank 1 with a weld. The sludge outlet 3 is set vertically downward, so that the sludge flows to the sludge discharge mechanism 10 under the action of gravity along the shortest path, minimizing the residence time of the sludge in the lower part of the tank 1 and the risk of agglomeration.

[0046] The dosing mechanism 4 has an inlet connected to the chemical delivery pump and multiple dosing outlets, which are distributed circumferentially along the top of the tank 1. In this embodiment, the circumferential distribution means that the multiple dosing outlets occupy different corners at the same horizontal position on the top of the tank 1, with a certain arc-length interval between adjacent outlets. This multi-point dosing arrangement allows the chemical to enter the tank simultaneously from multiple positions on the top of the tank 1, enabling the chemical to disperse simultaneously in different circumferential areas within the tank during the initial entry stage. This facilitates rapid and uniform mixing with the sludge and avoids the problem of excessively high local chemical concentrations caused by single-point dosing.

[0047] The stirring mechanism includes a drive unit 8, a stirring shaft 9, and combined stirring blades 11. The stirring shaft 9 is vertically arranged inside the tank 1 and is connected to the drive unit 8 for transmission. In this embodiment, the drive unit 8 is an electric motor with a reduction function, such as a geared motor, and its output shaft is connected to the stirring shaft 9 for transmission through a coupling.

[0048] The stirring shaft 9 can be made of hollow stainless steel tube, with its upper end connected to the drive device 8 and its lower end extending to the lower part of the tank 1, which ensures both strength and reduces weight. The upper end of the stirring shaft is connected to the geared motor, and the lower end extends to the bottom of the tank, with a wear-resistant nylon bushing at the bottom to constrain it and prevent it from deviating due to excessive resistance when rotating.

[0049] The combined stirring blade 11 includes multiple sets of blade units spaced apart along the axial direction of the stirring shaft 9. Each set of blade units includes a first type of blade 12 and a second type of blade 16. The first type of blade 12 and the second type of blade 16 are arranged at a predetermined angle in the circumferential direction of the stirring shaft 9. The predetermined angle refers to the angular difference between the two types of blades relative to the stirring shaft 9 in the circumferential direction. This angular difference can be preset according to the required flow field characteristics, so that the flow fields generated by the two types of blades during rotation are spatially staggered and form a synergistic composite flow field.

[0050] The first type of blade 12 has a connecting portion 13 and a working portion 14. The connecting portion 13 is fixed to the stirring shaft 9, and the working portion 14 extends obliquely upward relative to the axis of the stirring shaft 9. Figure 4 As shown, the working part 14 is inclined upward relative to the axis of the stirring shaft 9. During the rotation of the stirring shaft 9, the surface of the working part 14 faces the sludge at the bottom of the tank at a certain angle of attack, thereby generating an upward pushing force on the sludge at the bottom of the tank, causing the sludge at the bottom of the tank to flow upward in the tank, forming an axial circulating flow field from bottom to top.

[0051] The second type of blade 16 has vertical ribs 17 and connecting ribs 18. The vertical ribs 17 are located on both sides of the stirring shaft 9, and the connecting ribs 18 connect the vertical ribs 17 and the stirring shaft 9. There is a predetermined radial distance between the outer edge of the vertical ribs 17 and the inner wall of the tank 1. The predetermined radial distance means that the outer edge of the vertical ribs 17 is as close as possible to the inner wall of the tank 1 without interfering with or colliding with it, so that when the stirring shaft 9 rotates, the sludge adhering to the inner wall of the tank 1 is scraped off and removed, allowing it to re-enter the internal circulation flow.

[0052] The working process of this embodiment is as follows: sludge enters the tank from the top of the tank 1 through the sludge inlet pipe; at the same time, the agent is pressurized by the agent delivery pump and enters from the inlet of the dosing mechanism 4, and is simultaneously added into the tank 1 through multiple dosing outlets.

[0053] Start the drive device 8, drive the stirring shaft 9 to rotate the combined stirring blades 11: the working part 14 of the first blade 12 generates an upward pushing force on the sludge at the bottom of the tank, so that the sludge forms an overall circulation from bottom to top and then from top to bottom in the tank body 1; the vertical ribs 17 of the second blade 16 are close to the inner wall of the tank body 1, scraping off the sludge adhering to the tank wall and re-rolling it into the circulating flow field; since the first blade 12 and the second blade 16 are arranged at a set angle around the stirring shaft 9, the axial lifting flow and the circumferential scraping flow superimpose each other in the tank to form a three-dimensional turbulence, so that the sludge and the agent can be fully mixed at the microscale.

[0054] After stirring for a set time, the sludge discharge mechanism 10 is started, and the conditioned sludge is drawn out from the sludge discharge port 3 and transported to the downstream filter press for pressing and dewatering.

[0055] Example 2

[0056] This embodiment further explains the specific implementation of the first type of blade 12 and the second type of blade 16 based on Embodiment 1.

[0057] like Figure 4 As shown, the first type of blade 12 is made of angle steel. One end of the angle steel forms a connecting part 13 and is welded and fixed to the stirring shaft 9. One right-angled side of the angle steel forms a working part 14, and the working part 14 forms a preset angle with the rotating cone surface.

[0058] The rotating conical surface refers to the imaginary conical surface swept by the inner or outer edge of the working part 14 as it rotates with the stirring shaft 9. The installation angle of the working part 14 is defined using the rotating conical surface as a reference, facilitating unified control of the axial lifting performance of the first type of blade 12 in different blade units. Using angle steel as the material for the first type of blade 12 allows for the acquisition of blade blanks with two mutually perpendicular right-angled sides at a lower processing cost. One right-angled side is welded to the stirring shaft 9; the other right-angled side serves as the stirring working surface, undertaking the lifting function during rotation.

[0059] To further improve the bending resistance of the first blade 12, the first blade 12 also includes a reinforcing rib 15, with both ends of the reinforcing rib 15 connected to the connecting part 13 and the stirring shaft 9, respectively. The reinforcing rib 15 is typically a triangular or trapezoidal plate-shaped component, with one end welded to the side of the connecting part 13 facing the stirring shaft 9, and the other end welded to the stirring shaft 9, forming a triangular support structure for the connecting part 13. When stirring sludge with high sand content and strong abrasiveness, the reinforcing rib 15 can effectively disperse the reaction bending moment borne by the working part 14 during the material lifting process, reducing the risk of fatigue fracture at the root of the angle steel under long-term alternating loads.

[0060] Specifically, the angle steel is an equilateral angle steel with a specification of 60mm×60mm×6mm to 100mm×100mm×10mm; the included angle between the working part 14 and the axis of the stirring shaft 9 is 30 degrees to 60 degrees.

[0061] When the included angle is small, for example, close to 30 degrees, the working part 14 approaches the sludge at a small angle of attack, resulting in a smaller axial thrust component but also a smaller stirring resistance, which is suitable for sludge with low viscosity and high water content. When the included angle is large, for example, close to 60 degrees, the working part 14 approaches the sludge at a larger angle of attack, resulting in a significantly enhanced axial thrust, which is more suitable for treating high viscosity, poor fluidity, and high solids content sludge.

[0062] like Figure 1 and Figure 4 As shown, the second type of blade 16 also includes transverse ribs 19, which connect the upper and lower ends of the vertical ribs 17 on both sides respectively. The vertical ribs 17 and the transverse ribs 19 form a rectangular frame structure. The stirring shaft 9 passes through the center of the rectangular frame, and the connecting ribs 18 are stiffeners that fix the rectangular frame to the stirring shaft 9. By connecting the upper and lower ends of the vertical ribs 17 on both sides with transverse ribs 19, the two vertical ribs 17 and the two transverse ribs 19 together form a closed rectangular frame, giving the second type of blade 16 better overall rigidity when under stress and preventing the vertical ribs 17 from deflecting or shaking during the scraping process. The connecting ribs 18 fix the rectangular frame to the stirring shaft 9 in the form of stiffeners, which can reliably transmit the torque of the stirring shaft 9 to the rectangular frame and keep the rectangular frame in a stable radial position relative to the stirring shaft 9 during rotation.

[0063] Both the vertical ribs 17 and the horizontal ribs 19 are made of flat steel, with a width of 60mm to 100mm and a thickness of 6mm to 10mm. The height of the rectangular frame is adapted to the height of the tank body 1. The radial distance between the outer edge of the vertical ribs 17 and the inner wall of the tank body 1 is 5mm to 6mm.

[0064] The height of the rectangular frame is adapted to the height of the tank 1, which means that the coverage area of ​​the rectangular frame in the vertical direction matches the effective height of the tank 1 to accommodate sludge. In a specific embodiment, the height of the rectangular frame can be about 1 / 2 to 1 of the total height of the tank 1, so that the tank wall can be effectively scraped over a large height range.

[0065] When the radial spacing is too large, the adhesive layer cannot be effectively scraped off; when the radial spacing is too small, the ribs are prone to hard collisions with the tank wall due to manufacturing deviations of the tank body 1 or slight vibrations during the operation of the agitator shaft 9, which can aggravate wear and even damage the device. Controlling the radial spacing within the range of 5mm to 6mm can ensure effective removal of the sludge adhering layer on the wall surface, while also providing a reasonable safety margin for manufacturing errors, assembly errors, and slight runouts of the agitator shaft 9.

[0066] Example 3

[0067] Based on Example 1, this embodiment further explains the number and arrangement of blade units of the combined stirring blade 11.

[0068] The combined stirring blade 11 includes 3 to 6 sets of blade units spaced apart along the axial direction of the stirring shaft 9, with equal axial spacing between adjacent sets of blade units; in each set of blade units, the first type of blade 12 and the second type of blade 16 are arranged at a 90-degree angle in the circumferential direction of the stirring shaft 9.

[0069] By employing 3 to 6 sets of blade units arranged axially, the axial lifting flow generated by the first type of blade 12 and the circumferential wall-scraping flow generated by the second type of blade 16 can be uniformly distributed throughout the entire height range of the tank 1, avoiding the formation of dead zones in the height direction when relying solely on a single layer of blades. The arrangement of equal axial spacing between adjacent blade units is beneficial for forming a stable and uniformly layered flow field.

[0070] In each blade unit, the first type of blade 12 and the second type of blade 16 are arranged at a 90-degree angle around the stirring shaft 9. This allows the same height position inside the tank 1 to be disturbed by the working part 14 of the first type of blade 12 in an axial lifting manner during each rotation of the stirring shaft 9, and then cleaned by the vertical ribs 17 of the second type of blade 16 in a scraping manner. The two actions alternate in time and overlap in space, thereby forming a stable three-dimensional turbulence inside the tank.

[0071] Example 4

[0072] Based on Example 1, this embodiment further explains the specific structure of the dosing mechanism 4 and the sludge discharge mechanism 10.

[0073] like Figure 2As shown, the dosing mechanism 4 includes a main inlet pipe 5, a five-way connector 6, and four branch pipes 7. The main inlet pipe 5 is connected to the four branch pipes 7 via the five-way connector 6. The outlets of the four branch pipes 7 are evenly distributed on the same circumference of the top of the tank body 1 as multiple dosing outlets. The axes of the four dosing outlets are parallel to the axis of the tank body 1 or at a set angle to the axis of the tank body 1. The five-way connector 6 is a pipe fitting with one inlet and four outlets. Its inlet is connected to the main inlet pipe 5, and its four outlets are connected to the four branch pipes 7 respectively. It can distribute the agent flowing in from the main inlet pipe 5 equally into the four branch pipes 7, ensuring that the agent flow rate at the four dosing outlets is basically the same.

[0074] The outlets of the four branch pipes 7 are evenly distributed on the same circumference at the top of the tank 1, allowing the reagent to enter simultaneously in different quadrants of the horizontal cross-section of the tank 1. This eliminates uneven circumferential distribution of the reagent from the initial position, facilitating rapid mixing of the reagent and sludge. The axes of the four dosing outlets can be set vertically downwards parallel to the axis of the tank 1, allowing the reagent to enter the tank in a vertical jet manner; alternatively, they can be set at a predetermined angle to the axis of the tank 1, such as towards the center of the tank or at a certain angle along the tangential direction, to further guide and diffuse the reagent in conjunction with the flow field generated by the stirring mechanism. In one specific embodiment, the axes of all four dosing outlets are set vertically downwards parallel to the axis of the tank 1, and the diameter of the circumference is selected between 0.5 and 0.8 times the diameter of the tank 1, ensuring that the reagent enters close to the main stirring area inside the tank 1 without directly impacting the tank wall.

[0075] The sludge discharge mechanism 10 includes a screw pump, the inlet of which is connected to the sludge discharge port 3. By using a screw pump as the sludge discharge mechanism 10, the forced suction effect of the screw pump on the sludge at the inlet side during operation can apply a continuous and stable suction force to the sludge at the bottom of the tank 1, effectively overcoming the bridging effect that may occur at the sludge discharge port 3 due to high viscosity sludge, and ensuring the continuity and stability of the sludge discharge process.

[0076] Example 5

[0077] This embodiment is based on Embodiments 1 to 4 and provides two specific examples.

[0078] Example 1: Applicable to conventional municipal sewage sludge with a moisture content of approximately 85%.

[0079] In this example, tank 1 is made of 304 stainless steel with anti-corrosion treatment on the inner wall. The total height is 3000mm, the inner diameter is 2000mm, and the effective volume is 8 cubic meters. The diameter of mud outlet 3 is 219mm. The height of the conical guide section 2 is 600mm, and the cone angle is 45 degrees.

[0080] In the dosing mechanism 4, the main inlet pipe 5 is connected to the outlet pipe of the chemical delivery pump via a flange. The inlet diameter of the main inlet pipe 5 is 32mm. The five-way pipe 6 connects the main inlet pipe 5 to four branch pipes 7, each branch pipe 7 having a diameter of 32mm. The outlets of the four branch pipes 7 are evenly distributed on the same circumference with a diameter of 1200mm on the top of the tank body 1.

[0081] In the stirring mechanism, the drive unit 8 has a rated power of 7.5kW and an output speed of 11 revolutions per minute. It is connected to the stirring shaft 9 via a coupling. The stirring shaft 9 is made of hollow stainless steel tubing with an outer diameter of 80mm. Its lower end is equipped with a wear-resistant nylon bushing to constrain the radial displacement of the stirring shaft 9 during operation and prevent deviation due to excessive resistance. The combined stirring blades 11 are arranged with four sets of blade units along the axial direction of the stirring shaft 9. The axial distance between two adjacent sets of blade units is 600mm. The first type of blade 12 and the second type of blade 16 in each set of blade units are welded and fixed at a 90-degree angle to the circumference of the stirring shaft 9.

[0082] The first type of blade 12 uses equilateral angle steel of 80mm×80mm×8mm, and the included angle between the working part 14 and the axis of the stirring shaft 9 is 45 degrees; the second type of blade 16 has a rectangular frame height of 1500mm, which is about 1 / 2 of the height of the tank body 1. The vertical ribs 17 and the horizontal ribs 19 are both made of flat steel with a width of 80mm and a thickness of 8mm. The radial distance between the outer edge of the vertical ribs 17 and the inner wall of the tank body 1 is controlled between 5mm and 6mm.

[0083] In the sludge discharge mechanism 10, the screw pump is a G-type single screw pump with a flow rate of 10 cubic meters per hour, a head of 60 meters, and a motor power of 7.5 kW.

[0084] Under operating conditions, sludge enters from the top of tank 1 at a flow rate of 8 cubic meters per hour, and chemicals are injected synchronously from four dosing outlets through dosing mechanism 4 at a flow rate of 0.5 cubic meters per hour. The stirring shaft 9 rotates at a speed of about 11.7 revolutions per minute and continues to stir for 15 minutes before opening the sludge discharge mechanism 10 to discharge the material.

[0085] A conditioning test was conducted at a volume of 5 cubic meters per batch. The test results showed that the dosage was reduced by about 15% compared with the traditional single-point dosing device. There was no dead zone in the tank, no sediment at the bottom, and no sludge adhering to the inner wall. No sludge outlet blockage occurred after 8 hours of continuous operation. After conditioning, the sludge was dewatered by filter press, and the moisture content of the sludge cake was reduced from about 85% in the traditional device to about 80%, and the filter press efficiency was improved by about 20%.

[0086] Example 2: Suitable for high-viscosity, high-solids-content sludge

[0087] In this example, the total height of tank 1 is adjusted to 4000mm, the inner diameter is 2000mm, and the effective volume is 12 cubic meters; the height of the conical guide section 2 is 800mm, and the cone angle is 30 degrees.

[0088] In the dosing mechanism 4, the outlets of the four branch pipes 7 are evenly distributed on the same circumference with a diameter of 1600mm at the top of the tank body 1, which is suitable for a larger inner diameter of the tank body 1.

[0089] In the stirring mechanism, the rated power of the drive unit 8 is increased to 11kW, and the output speed is adjusted to 10 revolutions per minute. The combined stirring blades 11 are arranged with six sets of blade units along the axial direction of the stirring shaft 9, and the axial distance between two adjacent sets of blade units is 550mm.

[0090] The first type of blade 12 uses equilateral angle steel of 100mm×100mm×10mm, and the included angle between the working part 14 and the axis of the stirring shaft 9 is adjusted to 60 degrees; the rectangular frame height of the second type of blade 16 is adjusted to 2000mm, and both the vertical ribs 17 and the horizontal ribs 19 are made of flat steel with a width of 100mm and a thickness of 10mm. The radial distance between the outer edge of the vertical ribs 17 and the inner wall of the tank 1 is adjusted to 5mm to more thoroughly scrape off the high-viscosity sludge adhering to the inner wall of the tank 1.

[0091] In the mud discharge mechanism 10, the screw pump is selected with a flow rate of 20 cubic meters per hour.

[0092] Under operating conditions, sludge enters tank 1 at a flow rate of 15 cubic meters per hour, and chemicals are injected simultaneously at a flow rate of 0.9 cubic meters per hour. The mixing time is extended to 20 minutes before being pumped out by a screw pump.

[0093] As can be seen from Examples 1 and 2 above, by making targeted adjustments to specific parameters such as the size of the tank 1, the cone angle of the conical guide section 2, the distribution circumference diameter of the dosing outlet, the power and speed of the drive device 8, the number of blade units and the axial spacing, the specifications of the angle steel and the inclination angle of the working part 14, the height of the rectangular frame, the specifications of the flat steel and the radial spacing, different conditioning needs can be met, which has process adaptability and promotion and application value.

[0094] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0095] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0096] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above invention, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A sludge mixing and conditioning device with combined stirring blades, characterized in that, include: It includes a tank (1), a stirring mechanism, a dosing mechanism (4), and a sludge discharge mechanism (10); the tank (1) is vertically arranged and has a sludge discharge port (3) at its bottom, and the sludge discharge mechanism (10) is located at the sludge discharge port (3); the dosing mechanism (4) has an inlet connected to a drug delivery pump and multiple dosing outlets, and the multiple dosing outlets are distributed circumferentially at intervals along the top of the tank (1); The stirring mechanism includes a drive device (8), a stirring shaft (9) and a combined stirring blade (11). The stirring shaft (9) is vertically arranged inside the tank (1) and is connected to the drive device (8) in a transmission manner. The combined stirring blade (11) includes multiple sets of blade units spaced apart along the axial direction of the stirring shaft (9). Each set of blade units includes a first type of blade (12) and a second type of blade (16). The first type of blade (12) and the second type of blade (16) are arranged at a set angle in the circumferential direction of the stirring shaft (9). The first type of blade (12) has a connecting part (13) and a working part (14). The connecting part (13) is fixed on the stirring shaft (9), and the working part (14) extends obliquely upward relative to the axis of the stirring shaft (9). The second type of blade (16) has vertical ribs (17) and connecting ribs (18). The vertical ribs (17) are located on both sides of the stirring shaft (9), and the connecting ribs (18) connect the vertical ribs (17) and the stirring shaft (9). The outer edge of the vertical ribs (17) has a predetermined radial distance from the inner wall of the tank (1).

2. The sludge mixing and conditioning device with combined stirring blades according to claim 1, characterized in that, The first type of blade (12) is made of angle steel. One end of the angle steel forms the connecting part (13) and is welded and fixed to the stirring shaft (9). One right-angled side of the angle steel forms the working part (14). The working part (14) forms a preset angle with the rotating cone surface.

3. The sludge mixing and conditioning device with combined stirring blades according to claim 1, characterized in that, The first type of blade (12) also includes a reinforcing rib (15), which is inclined and its two ends are respectively connected to the connecting part (13) and the stirring shaft (9).

4. A sludge mixing and conditioning device with combined stirring blades according to claim 2, characterized in that, The angle steel is an equilateral angle steel, and the specifications of the angle steel are from 60mm×60mm×6mm to 100mm×100mm×10mm; The angle between the working part (14) and the axis of the stirring shaft (9) is 30 to 60 degrees.

5. A sludge mixing and conditioning device with combined stirring blades according to claim 1, characterized in that, The second type of blade (16) also includes a transverse rib (19), which connects the upper and lower ends of the vertical ribs (17) on both sides respectively. The vertical ribs (17) and the transverse ribs (19) form a rectangular frame structure. The stirring shaft (9) passes through the center of the rectangular frame, and the connecting rib (18) is a rib plate that fixes the rectangular frame to the stirring shaft (9).

6. A sludge mixing and conditioning device with combined stirring blades according to claim 5, characterized in that, The vertical ribs (17) and the horizontal ribs (19) are both made of flat steel, the width of which is 60mm to 100mm and the thickness of which is 6mm to 10mm; the height of the rectangular frame is adapted to the height of the tank (1). The radial distance between the outer edge of the vertical rib (17) and the inner wall of the tank (1) is 5 mm to 6 mm.

7. A sludge mixing and conditioning device with combined stirring blades according to claim 1, characterized in that, The combined stirring blade (11) includes 3 to 6 sets of blade units arranged axially along the stirring shaft (9), with the axial spacing between two adjacent sets of blade units being equal. In each set of blade units, the first type of blade (12) and the second type of blade (16) are arranged at a 90-degree angle to each other in the circumferential direction of the stirring shaft (9).

8. A sludge mixing and conditioning device with combined stirring blades according to claim 1, characterized in that, The lower diameter of the tank (1) gradually narrows to form a conical guide section (2). The large end of the conical guide section (2) is connected to the main body of the tank (1), and the small end of the conical guide section (2) is connected to the mud outlet (3). The cone angle of the cone-shaped guide section (2) is 30 to 60 degrees, and the mud outlet (3) is set vertically downward.

9. A sludge mixing and conditioning device with combined stirring blades according to claim 1, characterized in that, The dosing mechanism (4) includes a main dosing pipe (5), a five-way pipe (6), and four branch pipes (7). The main dosing pipe (5) is connected to the four branch pipes (7) through the five-way pipe (6). The outlets of the four branch pipes (7) are evenly distributed on the same circumference of the top of the tank (1) as multiple dosing outlets. The axes of the four dosing outlets are parallel to the axis of the tank (1) or at a set angle to the axis of the tank (1).

10. A sludge mixing and conditioning device with combined stirring blades according to claim 1, characterized in that, The mud discharge mechanism (10) includes a screw pump, the inlet of which is connected to the mud discharge port (3).

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