A medicament mixing device suitable for dredging slurry conditioning

Abstract

The utility model provides a kind of reagent mixed flow device suitable for dredging slurry conditioning, comprising: barrel, two ends are equipped with feed inlet and discharge port;Grid assembly contains multiple grid monomers, which are arranged along the axial direction of the barrel and located on both sides of the inner wall of the barrel radially, in some embodiments, the grid monomers are inclinedly arranged;Dosing assembly is inserted into the outer wall of the barrel and extends into the barrel, at least two dosing devices are radially arranged on any grid monomer, in some embodiments, the dosing assembly is inclinedly arranged;Spiral blade is arranged on the axis of the barrel and is welded with the grid monomer.Some grid monomers are provided with a clearance, and the barrel has a connecting flange at both ends.The device forms a composite flow field by constructing a slurry conveying channel, multi-point injection of reagent, etc., so that the slurry is uniformly mixed without mechanical stirring, reducing energy consumption, improving mixing efficiency and reducing maintenance cost, and the inclined structure and other designs further optimize the performance, improve the service life and applicability of the device.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a chemical mixing device suitable for dredging sludge conditioning. Background Technology

[0002] In dredging projects, before solidifying the dredged sludge, a coagulant needs to be added to the sludge for conditioning, so that the sludge can solidify better. The purpose of sludge conditioning is to pre-treat the sludge to improve the efficiency of sludge thickening and dewatering, and to systematically improve the properties of the sludge for economical subsequent treatment.

[0003] Currently, the main method for conditioning dredged mud is the mixing method using a mixer.

[0004] The mixing method using a mixer employs a paddle or turbine mixer, which has strong shear force and can achieve multi-directional flow mixing, but it has the following drawbacks: It has high energy consumption, as mechanical stirring requires continuous power input, and the larger the processing capacity, the higher the energy cost. The equipment is complex to maintain: the agitator shaft sealing components (such as mechanical seals) require regular maintenance, and corrosive agents can accelerate component wear; Large space requirement: Off-site mixing requires a supporting mixing tank, which places high demands on the site.

[0005] Therefore, we propose a chemical mixing device suitable for dredging mud conditioning. Utility Model Content

[0006] Therefore, it is necessary to address the technical problems of high energy consumption, complex equipment maintenance, and large space occupation in the traditional mixing method of dredging mud conditioning, and to provide a chemical mixing device suitable for dredging mud conditioning. This device would enable efficient and uniform chemical mixing of dredging mud under no-power or low-power conditions, reduce treatment costs, improve treatment efficiency, and reduce equipment maintenance requirements.

[0007] This invention provides a chemical mixing device suitable for dredging slurry conditioning, comprising a cylinder with an inlet and an outlet at its two axial ends; a grid assembly including multiple grid cells connected to the inner wall of the cylinder and spaced apart along the axial direction of the cylinder, with adjacent grid cells located on opposite radial sides of the inner wall of the cylinder; a dosing assembly inserted into the outer wall of the cylinder and extending into the cylinder, with at least two dosing devices arranged radially on each of the grid cells, and the dosing devices located on the side of the grid cell closer to the inlet; and a spiral blade disposed on the axis of the cylinder and connected to the grid assembly. This device constructs a slurry conveying channel through the cylinder, forms a composite flow field through the grid assembly, achieves multi-point injection of chemicals through the dosing assembly, and controls the axial flow velocity of the slurry through the spiral blade. Together, these elements enable uniform mixing of the slurry without mechanical stirring, effectively reducing energy consumption, improving mixing efficiency, and reducing equipment maintenance costs.

[0008] In other embodiments, the grid unit is inclined, and the angle α between the grid unit and the cylinder axis satisfies 90° < α < 150°. This inclined structure forms a guide slope in the mud flow path, generating shear force by changing the direction of fluid movement, thereby increasing the contact area between the agent and mud particles, promoting agent dispersion, reducing the frontal impact resistance when the fluid passes through, reducing energy loss, and extending the continuous operation cycle of the equipment.

[0009] In other embodiments, the dosing assembly is inclined, and the angle β between the dosing assembly and the cylinder axis satisfies 30° < β < 90°. This inclination angle causes the injection direction of the agent to counteract the flow direction of the mud, improving the mixing effect, avoiding excessively high local agent concentrations caused by vertical dosing and flow stagnation caused by horizontal dosing, achieving uniform mixing of the agent and mud in a laminar flow state, reducing reliance on mechanical stirring, and lowering energy consumption and the risk of corrosion of mechanical seal components.

[0010] In other embodiments, the helical blades are welded and fixed to the grid unit. This connection method allows the helical blades and the grid unit to form an integral structure, improving the overall strength of the device. It also provides internal support for the helical blades, preventing the flow of mud from being affected when supporting the helical blades on both sides of the cylinder, thus ensuring the continuity and stability of mud treatment.

[0011] In other embodiments, the grid unit is provided with a clearance groove to avoid the helical blades. The clearance groove design ensures a tight fit between the helical blades and the grid unit, while avoiding interference between the helical blades and the grid unit during rotation, thus ensuring the normal operation of the device and improving its service life and reliability.

[0012] In other embodiments, connecting flanges are respectively connected to both ends of the cylinder in the axial direction. The connecting flanges facilitate docking between cylinders and also make it easy to dock with mud pipelines, improving the flexibility and applicability of the device and enabling the chemical mixing device to be easily integrated into existing mud treatment systems. Attached Figure Description Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 for Figure 1 Top sectional view.

[0014] Figure 3 for Figure 1 The right view.

[0015] in: 100, cylinder body; 200, grid assembly; 201, grid unit; 300, dosing assembly; 400, spiral blade; 401, clearance groove; 500, connecting flange. Detailed Implementation

[0016] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0017] In existing technologies, sludge solidification treatment for dredging projects requires the use of mixers to mix chemicals. Traditional paddle or turbine mixers rely on continuous power input, resulting in excessive energy consumption. Mechanical seals are susceptible to corrosion from chemicals and require frequent maintenance. Furthermore, the accompanying mixing tanks occupy significant space. In river dredging projects, narrow work areas make it difficult to accommodate large mixing equipment, and sludge treatment efficiency is limited by the intermittent operation of mechanical mixing.

[0018] To address the aforementioned issues and the power dependence and spatial limitations inherent in mechanical mixing, this embodiment utilizes the characteristic of mud flowing freely under the action of a pump. It also employs alternating grid components 200 to form a composite flow field, combined with a spiral conveying structure to control the axial flow velocity, ultimately forming a non-powered mixing system.

[0019] like Figures 1-3 As shown, this application proposes a cylinder 100, a grid assembly 200, a dosing assembly 300, and a spiral blade 400. The cylinder 100 has an inlet and an outlet at both axial ends to form a continuous processing channel; multiple grid units 201 are axially spaced along the inner wall of the cylinder 100, with adjacent units positioned on opposite radial sides; each grid unit 201 is radially provided with at least two dosing assemblies 300 located on the inlet side; the spiral blade 400 is fixed to the grid assembly 200 and extends along the axis of the cylinder 100.

[0020] The cylinder 100 refers to a cylindrical pipe structure that can be modularly assembled using segmented flange connections (involving connecting flange 500) to construct a mud conveying channel. The grid assembly 200 refers to a grid structure formed by cutting metal sheets; the grid spacing can be adjusted according to the mud viscosity to generate multidirectional turbulence. The dosing assembly 300 refers to an injection pipe with a one-way valve, inserted obliquely into the wall of the cylinder 100 and extending to the axial region, with the injection angle opposing the mud flow direction. The spiral blade 400 refers to a continuous spiral metal strip welded to the grid unit 201 to extend the mud residence time.

[0021] Specifically, after the slurry is pumped into the cylinder 100 through the inlet, the spiral blades 400 convert the linear flow into spiral motion, reducing the axial velocity and promoting full diffusion of the reagent. The grid cells 201 are alternately distributed on both sides of the inner wall of the cylinder 100. As the slurry flows through each grid cell 201, a shear force with a sudden change in direction is generated, creating a superimposed turbulence effect. The dosing assembly 300 injects reagent at multiple points on the feed side of the grid cells 201, and the turbulence causes the reagent to mix with the slurry in three dimensions. The spacing between adjacent grid cells 201 can be set to 0.3-0.5 times the diameter of the cylinder 100 to ensure the gradual transfer of turbulent energy. The synergistic effect of the spiral blades 400 and the grid assembly 200 enables the slurry to achieve uniform mixing without mechanical stirring.

[0022] Compared to existing technologies, traditional mixers rely on rotating components to generate shear force. This solution generates self-sustaining turbulence through flow path optimization, eliminating the need for a power drive device. In existing technologies, the vertical insertion of the dosing pipe into the mixing tank leads to uneven chemical distribution. This solution addresses this by using an inclined dosing assembly 300 combined with a grid to create a gradient mixing effect. The sealing structure of mechanical mixers is susceptible to chemical corrosion; this solution employs an open flow channel to completely eliminate the need for dynamic sealing.

[0023] Through the above technical solutions, this application achieves a reduction of over 50% in energy consumption for sludge treatment, a 3-5 times extension of equipment maintenance cycles, and a reduction in the length of the mixing unit to one-third of that of a traditional mixing tank. Improved reagent diffusion efficiency reduces reagent consumption per unit treatment volume, and mixing uniformity reaches over 90%. The 100mm modular design of the cylinder supports series expansion to adapt to different scale treatment needs.

[0024] This application further proposes that the grid unit 201 is inclined, and the included angle α between the grid unit 201 and the cylinder 100 in the axial direction satisfies 90°<α<150°.

[0025] The inclined arrangement of the grid unit 201 refers to the grid plane forming a non-perpendicular angle with the axis of the cylinder 100. This can be achieved by welding or bolting the grid unit 201 to different radial positions on the inner wall of the cylinder 100. This inclined structure forms a guide slope in the mud flow path, generating shear force by changing the direction of fluid movement. The included angle α is controlled within the range of 90° to 150°, which can be achieved by adjusting the positioning angle of the grid unit 201 during installation. This angle range ensures that the grid maintains its ability to segment the mud while avoiding the formation of a completely vertical obstruction surface.

[0026] Specifically, as the mud flows axially along the cylinder 100, the inclined grid unit 201 divides the fluid into multiple branches. Because the grid plane forms an obtuse angle with the flow direction, the mud undergoes directional deflection as it passes through the grid unit 201, creating vortex turbulence. This change in flow state increases the contact area between the reagent and the mud particles, while the shearing effect generated by the inclined grid promotes reagent dispersion. Compared to a vertical grid, the inclined structure reduces the frontal impact resistance of the fluid, allowing the mud to achieve multi-directional mixing while maintaining axial propulsion.

[0027] Through the above technical solution, this application effectively reduces energy loss during the mud flow process, and reduces the power input required to drive the auger blades 400 while ensuring mixing uniformity. The multi-directional turbulence generated by the inclined grid replaces the unidirectional shearing of traditional mechanical stirring, allowing for more thorough contact between the reagent and mud particles. The reduction in flow resistance also extends the continuous operation cycle of the equipment and reduces the need for downtime maintenance due to pressure buildup.

[0028] This application further proposes that the dosing assembly 300 is inclined, and the included angle β between the dosing assembly 300 and the cylinder 100 axial direction satisfies 0°<β<90°.

[0029] The inclined setting of the dosing assembly 300 refers to the injection direction of the dosing device forming an acute angle with the axial direction of the cylinder 100. This can be achieved using an adjustable-angle mounting bracket or a nozzle structure with a fixed inclination angle. This inclination angle creates a counter-current between the agent injection direction and the mud flow direction, improving the mixing effect. Specifically, when the mud flows along the axial direction of the cylinder 100, the inclined dosing assembly 300 injects the agent into the mud flow field at an acute angle. This angle range ensures that the agent jet works in coordination with the mud flow direction under the action of the axial component force, reducing flow resistance, while simultaneously forming lateral diffusion under the action of the radial component force. This design avoids excessively high local agent concentrations caused by vertical dosing and also prevents flow stagnation caused by horizontal dosing. Through flow field optimization, the agent and mud achieve uniform mixing in a laminar flow state, reducing reliance on mechanical stirring, thereby reducing energy consumption and the risk of corrosion of mechanical seal components.

[0030] This application further proposes that the helical blade 400 is welded and fixed to the grid unit 201, and that an avoidance groove 401 is provided on the grid unit 201 to avoid the helical blade 400.

[0031] This allows the spiral blade 400 and the grid unit 201 to form an integrated structure, improving strength. At the same time, it also enables the spiral blade 400 to be supported internally, avoiding the impact on the flow of mud when the spiral blade 400 is supported on both sides of the cylinder 100.

[0032] In this embodiment, the two ends of the cylinder 100 in the axial direction are respectively connected to connecting flanges 500, which facilitates the docking between cylinders 100 and the docking with mud pipes.

[0033] In this embodiment, the specific working principle is as follows: Working principle The non-powered mixing system for sludge solidification treatment in dredging projects proposed in this application mainly consists of a cylinder 100, a grid assembly 200, a dosing assembly 300, and a spiral blade 400 working together to achieve efficient and low-energy mixing of sludge and chemicals. The specific working principle is as follows: The slurry is pumped into the system through the inlet at one axial end of the cylinder 100. The cylinder 100 serves as the slurry conveying channel and adopts a cylindrical pipe structure. It is modularly assembled through a segmented flange connection (connecting flange 500) and can be expanded in series according to the actual processing scale to meet the needs of dredging projects of different scales.

[0034] The helical blades 400, fixed to the grid assembly 200, extend along the axis of the cylinder 100. When the slurry enters the cylinder 100, the helical blades 400 convert the linear flow of the slurry into helical motion. This helical motion reduces the axial velocity of the slurry, allowing the subsequently injected chemicals more time to fully diffuse in the slurry, creating favorable conditions for the uniform mixing of chemicals and slurry.

[0035] The grid assembly 200 consists of multiple grid units 201, which are arranged axially at intervals along the inner wall of the cylinder 100, with adjacent units positioned on opposite radial sides. The grid units 201 are made of sheet metal cut into a grid structure, and the grid spacing can be adjusted according to the viscosity of the mud.

[0036] As the mud flows within the cylinder 100, it experiences abruptly directional shear forces as it passes through each grid unit 201. These shear forces create a superimposed turbulence effect within the mud, making its flow state complex and disordered, thus providing a powerful impetus for thorough mixing of the reagents and the mud.

[0037] As the mud flows axially along the cylinder 100, the inclined grid unit 201 divides the fluid into multiple branches. When the mud passes through the grid unit 201, its direction is deflected due to the obtuse angle between the grid plane and the flow direction, creating vortex turbulence. This change in flow state increases the contact area between the reagent and the mud particles, and the shearing effect generated by the inclined grid further promotes reagent dispersion. Compared to a vertical grid, the inclined structure reduces the frontal impact resistance of the fluid, allowing the mud to achieve multi-directional mixing while maintaining axial propulsion, effectively reducing energy loss during mud flow.

[0038] During the mud flow process, the dosing assembly 300 injects chemicals at multiple points on the feed side of the grid unit 201. Due to the inclined setting of the dosing assembly 300, the direction of chemical injection is opposite to the direction of mud flow. This angle range ensures that the chemical jet works in coordination with the direction of mud flow under the action of the axial component force, reducing flow resistance, while forming lateral diffusion under the action of the radial component force. This design avoids excessively high local chemical concentrations caused by vertical dosing and also prevents flow stagnation caused by horizontal dosing. Through flow field optimization, the chemical and mud achieve uniform mixing in a laminar flow state, forming a gradient mixing effect, reducing the dependence on mechanical stirring, thereby reducing energy consumption and the risk of corrosion of mechanical seal components.

[0039] The helical blades 400 and the grid assembly 200 work together. The helical blades 400 control the axial flow velocity of the mud, while the grid assembly 200 generates multidirectional turbulence, enabling the mud to be uniformly mixed without mechanical stirring. Furthermore, the helical blades 400 are welded and fixed to the grid unit 201, and the grid unit 201 has clearance grooves 401 that avoid the helical blades 400, forming an integrated structure that improves overall strength. This also provides internal support for the helical blades 400, preventing the mud flow from being affected when supporting the helical blades 400 on both sides of the cylinder 100.

[0040] Finally, the thoroughly mixed slurry flows out from the discharge port at the other end of the cylinder 100, completing the agent mixing stage in the sludge solidification treatment. The entire process requires no power drive device, relying solely on the free flow of the slurry under the action of the pump and the rational design and coordinated work of each component, achieving efficient, low-energy consumption, and low-maintenance mixing of slurry and agents.

[0041] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A chemical mixing device suitable for dredging mud conditioning, characterized in that, include: The cylinder has an inlet and an outlet at its two axial ends, respectively. The grid assembly includes multiple grid units connected to the inner wall of the cylinder and arranged at intervals along the axial direction of the cylinder, with two adjacent grid units located on opposite sides of the radial direction of the inner wall of the cylinder. A dosing assembly is inserted into the outer wall of the cylinder and extends into the cylinder. Each of the grid units is provided with at least two dosing devices in the radial direction, and the dosing devices are located on the side of the grid unit closer to the feed inlet. Helical blades are disposed on the axis of the cylinder and are connected to the grid assembly.

2. The chemical mixing device for dredging mud conditioning as described in claim 1, characterized in that: The grid unit is inclined, and the angle α between the grid unit and the cylinder axis satisfies 90°<α<150°.

3. The chemical mixing device for dredging mud conditioning as described in claim 1, characterized in that: The dosing assembly is inclined, and the angle β between the dosing assembly and the cylinder axis satisfies: 30° < β < 90°.

4. A chemical mixing device for dredging mud conditioning as described in claim 1, characterized in that: The spiral blades are welded and fixed to the grid unit.

5. A chemical mixing device for dredging mud conditioning as described in claim 1, characterized in that: The grid unit is provided with a clearance groove to avoid the helical blades.

6. A chemical mixing device for dredging mud conditioning as described in claim 1, characterized in that: The two ends of the cylinder are respectively connected to connecting flanges along the axial direction.

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