Flocculant dispensing and maturation system

Abstract

This utility model discloses a flocculant preparation and maturation system, which includes a feeder, a vacuum feed pipe, a feeding hopper, a feeding pipe, a cyclone premixer, a mixing tank, and a flocculation tank. The inlet of the feeder is connected to the vacuum feed pipe, and the outlet of the feeder is connected to the inlet of the feeding hopper. The outlet of the feeding hopper is connected to the powder inlet of the cyclone premixer through the feeding pipe. The tangential liquid inlet of the cyclone premixer is connected to a premixed water inlet pipe. The outlet of the cyclone premixer is connected to the inlet pipeline of the mixing tank, and the outlet of the mixing tank is connected to the inlet pipeline of the flocculation tank. The inlet of the flocculation tank is connected to a dilution water inlet pipe. The flocculation tank is divided into a primary dissolving zone, a secondary maturation zone, and a tertiary storage zone by a partition. The bottom of the partition is provided with a flow hole.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment agent preparation technology, specifically relating to a flocculant preparation and maturation system. Background Technology

[0002] Flocculants (especially high-molecular-weight organic flocculants such as polyacrylamide) are widely used in water treatment and dewatering processes, and their effectiveness directly affects solid-liquid separation efficiency and effluent quality. The performance of flocculants is closely related to their degree of dissolution and maturation. Sufficient settling time is typically required after preparation to ensure the full extension of the long molecular chains. Insufficiently maturated solutions will retain a large number of undissolved colloidal particles, leading not only to decreased reagent utilization and increased operating costs, but also to a high risk of clogging dosing pumps and pipelines, causing frequent equipment failures and affecting the continuous and stable operation of the dewatering process.

[0003] Currently, the common form of existing flocculant dosing systems is a multi-chamber series structure, with the chambers connected by an upper overflow port. The flocculant solution overflows naturally to the next chamber based on the liquid level difference. However, this top-connected free overflow structure has a serious problem of water flow short-circuiting. The newly added diluted flocculant solution has a low density and floats on the surface of the water, overflowing directly to the next chamber through the upper connection port, skipping the stirring and hydrolysis process. The chambers cannot achieve the sequential flow of primary dissolution, secondary maturation, and tertiary storage of the flocculant, and the residence time of the unmatured colloid at the bottom is ineffective. The actual effective maturation time is far lower than the minimum maturation residence time standard (60 min) for PAM agents, especially in low-temperature environments in winter, where the activity of water molecules decreases, the rate of agent dissolution reaction slows down, and the maturation effect is basically ineffective. Utility Model Content

[0004] The purpose of this invention is to provide a flocculant preparation and maturation system to solve the problems of short maturation time and water flow short circuit in the existing technology.

[0005] This utility model is implemented by the following technical solution: a flocculant preparation and maturation system, which includes a feeder, a vacuum feed pipe, a feeding hopper, a feeding pipe, a cyclone premixer, a mixing tank, and a flocculation tank; The inlet of the suction machine is connected to the vacuum suction pipe, the outlet of the suction machine is connected to the inlet of the feeding hopper, the outlet of the feeding hopper is connected to the powder inlet of the cyclone premixer through the feeding pipe, the tangential liquid inlet of the cyclone premixer is connected to the premix water inlet pipe, the outlet of the cyclone premixer is connected to the inlet pipeline of the mixing tank, the outlet of the mixing tank is connected to the inlet pipeline of the flocculation tank, and the inlet of the flocculation tank is connected to the dilution water inlet pipe; The bottom inner wall of the flocculation tank is fixed with multiple vertically arranged baffles. The two sides of the baffles are fixedly connected to the two inner walls of the flocculation tank. The flocculation tank is divided into a primary drug dissolving zone, a secondary maturation zone, and a tertiary drug storage zone in sequence by the baffles. The bottom of the baffles is provided with flow holes.

[0006] Furthermore, the premixed water inlet pipe and the dilution water inlet pipe are respectively connected to the main water supply pipe.

[0007] Furthermore, the dilution inlet pipe is provided with a first regulating valve and a first flow meter in sequence along the internal water flow direction.

[0008] Furthermore, a second regulating valve is installed on the pipeline between the outlet of the mixing tank and the inlet of the flocculation tank.

[0009] Furthermore, the outlet of the flocculation tank is connected to a drug outlet pipe, and a second flow meter is installed on the drug outlet pipe.

[0010] Furthermore, level gauges are respectively installed on the side walls of the mixing tank and the flocculation tank.

[0011] Furthermore, the outer wall of the mixing tank is provided with a heating jacket.

[0012] The advantages of this invention are: by adding medicine through a suction feeder, the labor intensity of manual medicine addition is reduced. At the same time, in conjunction with the tangential water inlet of the cyclone premixer, the high-speed water flow forms a strong rotating flow field in the cavity. The powdered medicine is drawn in by the cyclone and, under the action of centrifugal force and strong shear force, is quickly torn, dispersed and evenly mixed, completing the initial hydration process. After entering the mixing tank, it can dissolve more quickly, significantly shortening the time required for overall maturation. An independent mixing tank is set up as the primary drug preparation and maturation unit. After the drug solution completes its initial dissolution and settling maturation in the mixing tank, it is then transferred to the flocculation tank for secondary maturation. Flow holes are opened at the bottom of the internal partition of the flocculation tank. The drug solution flows from the bottom of the first compartment to the second and third compartments step by step, forming a forced sequential flow channel. This avoids the water flow short-circuiting problem of the overflow structure at the top, so that the total effective maturation time of the drug solution reaches more than 60 minutes, which meets the minimum maturation standard of PAM agent. It can also ensure that the agent fully expands and dissolves even in low temperature environments in winter. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1This is a flowchart of the production system of this utility model; In the diagram: 1-Feeder; 2-Vacuum suction pipe; 3-Discharge bin; 4-Discharge pipe; 5-Swirl premixer; 6-Agitator; 7-Flocculation tank; 71-Primary dissolving zone; 72-Secondary maturation zone; 73-Tertiary storage zone; 8-Premixed water inlet pipe; 9-Dilution water inlet pipe; 10-Baffle; 11-Flow hole; 12-Overflow channel; 13-First regulating valve; 14-First flow meter; 15-Second regulating valve; 16-Discharge pipe; 17-Second flow meter; 18-Level gauge; 19-Heating jacket; 20-Dosing pump; 21-Metering tank; 22-Vibration motor; 23-Agitator. Detailed Implementation

[0015] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] like Figure 1 As shown, the flocculant preparation and maturation system of this embodiment includes a feeder 1, a vacuum feed pipe 2, a feeding hopper 3, a feeding pipe 4, a cyclone premixer 5, a mixing tank 6, and a flocculation tank 7.

[0017] The inlet of the suction machine 1 is connected to the vacuum suction pipe 2, and the outlet of the suction machine 1 is connected to the inlet of the discharge bin 3. PAM dry powder is automatically sucked from the metering barrel 21 to the discharge bin 3 by vacuum suction, realizing automatic feeding.

[0018] The outlet of the feeding hopper 3 is connected to the powder inlet of the cyclone premixer 5 via the feeding pipe 4. A vibrating motor 22 is installed on the outer wall of the feeding hopper 3. The vibrating motor 22 vibrates intermittently and is linked to the suction machine 1 for control. It vibrates synchronously during the operation of the suction machine 1 to assist in the smooth discharge of material from the feeding hopper. The material in the feeding hopper 3 is discharged into the cyclone premixer 5 under its own weight. The tangential liquid inlet of the cyclone premixer 5 is connected to the premixing water inlet pipe 8. Clean water from the main water supply pipe enters the cyclone premixer 5 tangentially through the premixing water inlet pipe 8, and is initially mixed with the synchronously fed PAM dry powder under the action of cyclone to form a pre-dispersed solution, preventing the dry powder from clumping.

[0019] The outlet of the cyclone premixer 5 is connected to the inlet pipeline of the stirred tank 6. The stirred tank 6 is equipped with a stirring device inside, where the drug solution undergoes initial dissolution and stirring. The outer wall of the stirred tank 6 is equipped with a heating jacket 19, which allows hot water or steam to be introduced to heat the tank in low-temperature winter conditions, thereby increasing the PAM dissolution rate. The heating jacket 19 is wrapped around the lower outer wall of the stirred tank 6, and its thickness is 20-50 mm. The heating jacket 19 has a heat medium inlet at the bottom and a heat medium outlet at the top. A temperature sensor is fixedly installed on the outer wall of the stirred tank 6, and the probe of the temperature sensor extends into the interior of the stirred tank 6.

[0020] The outlet of the mixing tank 6 is connected to the inlet pipeline of the flocculation tank 7. A second regulating valve 15 is installed on the pipeline to control the flow rate and timing of the chemical solution being released from the mixing tank 6 into the flocculation tank 7.

[0021] The inlet of the flocculation tank 7 is connected to a dilution inlet pipe 9. The dilution inlet pipe 9 is equipped with a first regulating valve 13 and a first flow meter 14 in sequence along the water flow direction. Dilution water can be added to the flocculation tank 7 through the dilution inlet pipe 9 to adjust the concentration of the chemical solution to the target ratio.

[0022] Multiple vertically arranged baffles 10 are fixed to the inner wall of the bottom of the flocculation tank 7. The two sides of the baffles 10 are fixedly connected to the inner walls of the two sides of the flocculation tank 7. The flocculation tank 7 is divided into a primary dissolving zone 71, a secondary maturation zone 72, and a tertiary storage zone 73 by the baffles 10. An overflow channel 12 is formed between the top of the baffles 10 and the flocculation tank 7. The overflow channel 12 is a safety overflow outlet, and its elevation is 100-150mm higher than the normal working liquid level. It is only used as an emergency overflow channel when the liquid level rises abnormally, so as to send the overflow liquid to the tertiary storage zone 73 for external delivery. Under normal operating conditions, no liquid overflows through this channel. The flow holes 11 are circular holes with a diameter of DN50-DN100. The distance between the lower edge of the flow hole 11 and the bottom surface of the flocculation tank 7 does not exceed 50mm. 2-4 flow holes 11 are evenly opened on each baffle 10. A stirring device 23 is installed in the primary dissolving zone 71, the secondary maturation zone 72, and the tertiary storage zone 73. The stirring device 23 is a paddle mixer, installed at the center of the top of each chamber, with the stirring shaft extending below the liquid surface and rotating at 60-120 r / min. In the flocculation tank 7, the chemical solution flows from the bottom of the first compartment to the bottom of the second compartment through the flow hole 11, and then flows to the bottom of the third compartment through the flow hole at the bottom of the second compartment. This achieves a forced sequential flow from bottom to top, avoiding the short-circuiting problem of the water flow in the upper overflow structure. It ensures that the first prepared chemical is matured and used first, preventing the mixing of new and old chemicals or the local chemical from remaining stagnant and deteriorating for a long time. The modification to the original flocculation tank 7 is minimal and the cost is low.

[0023] The outlet of the flocculation tank 7 is connected to a chemical discharge pipe 16, which is equipped with a second flow meter 17 for measuring the chemical supply flow rate. The chemical discharge pipe 16 is also equipped with a dosing pump 20 to transport the matured and qualified chemical solution to the sludge dewatering equipment.

[0024] The side walls of the mixing tank 6 and the flocculation tank 7 are respectively equipped with level gauges 18, which are used to monitor the liquid level of each tank in real time and provide control basis for the preparation, release and supply of medicines.

[0025] The workflow of this system is as follows: Dosing stage: The metering container 21 is pre-filled with the metered amount of PAM dry powder required for each dosing. The suction machine 1 sucks the PAM dry powder into the feeding hopper 3 through the vacuum suction pipe 2. The PAM dry powder feeding hopper 3 is then fed into the cyclone premixer 5 by the vibrating motor 22. Clean water from the main water supply pipe enters the cyclone premixer 5 through the premixing inlet pipe 8, and is initially mixed with the PAM dry powder fed into the feeding hopper 3 through the feeding pipe 4 under the action of cyclone. The premixed solution enters the mixing tank 6, and the stirring device is started to complete the initial dissolution of the agent. The volume of each dosing is controlled at 4.5m³. 3 Within.

[0026] Maturation stage: The chemical solution is initially mixed in the mixing tank 6 and matured under stirring over time; after the chemical solution in the flocculation tank 7 is consumed, the second regulating valve 15 is opened to release the initially matured chemical solution into the first compartment of the flocculation tank 7 by gravity flow.

[0027] Secondary maturation stage: After the chemical solution enters the flocculation tank 7, it flows sequentially through the first, second and third compartments along the flow holes 11 at the bottom of the baffle 10. The mixture is continuously stirred in each compartment to achieve forced sequential flow and full maturation.

[0028] Dosing stage: The qualified chemical solution after maturation is stored in the third chamber of flocculation tank 7, and is drawn by dosing pump 20 through outlet pipe 16 and added to sludge dewatering equipment.

[0029] In this embodiment, the effective volume of the mixing tank 6 is 5.0 m³. 3 The total effective volume of flocculation tank 7 is 4.5m³. 3 (Each of the three sections is 1.5m) 3 The total effective volume of the system is 9.0 m³. 3 There are 4 dosing pumps in total, each with a rated flow rate of 1.5 m³ / h. 3 / h, total drug supply flow rate at full load is 6.0m³. 3 / h. The theoretical overall maturation time of the drug solution is T=9.0÷6.0=1.5h=90min. After deducting the ineffective time loss of about 30min in the preparation and release process, the effective maturation time can reach 60min, which meets the minimum maturation standard of PAM agents.

[0030] In summary, this utility model, by adding an independent mixing tank and modifying the bottom opening of the flocculation tank, achieves two-stage maturation and forced sequential flow of the flocculant solution, effectively solving the technical problems of insufficient maturation time and low agent utilization rate in the existing top-connected dosing system, and has significant economic benefits and practical value.

[0031] In this embodiment, based on common knowledge known to those skilled in the art and production conditions, each pipeline is equipped with valves to control the material conveying and flow regulation, ensuring that the operation of each link is controllable. Pressure gauges and conveying pumps can be optionally installed on the pipelines to control the pressure of material conveying.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flocculant preparation and maturation system, characterized in that, It includes a suction feeder, a vacuum suction pipe, a feeding hopper, a feeding pipe, a cyclone premixer, a mixing tank, and a flocculation tank; The inlet of the suction machine is connected to the vacuum suction pipe, the outlet of the suction machine is connected to the inlet of the feeding hopper, the outlet of the feeding hopper is connected to the powder inlet of the cyclone premixer through the feeding pipe, the tangential liquid inlet of the cyclone premixer is connected to the premix water inlet pipe, the outlet of the cyclone premixer is connected to the inlet pipeline of the mixing tank, the outlet of the mixing tank is connected to the inlet pipeline of the flocculation tank, and the inlet of the flocculation tank is connected to the dilution water inlet pipe; The bottom inner wall of the flocculation tank is fixed with multiple vertically arranged baffles. The two sides of the baffles are fixedly connected to the two inner walls of the flocculation tank. The flocculation tank is divided into a primary drug dissolving zone, a secondary maturation zone, and a tertiary drug storage zone in sequence by the baffles. The bottom of the baffles is provided with flow holes.

2. The flocculant preparation and maturation system according to claim 1, characterized in that, The premixed water inlet pipe and the dilution water inlet pipe are respectively connected to the main water supply pipe.

3. The flocculant preparation and maturation system according to claim 1, characterized in that, The dilution inlet pipe is equipped with a first regulating valve and a first flow meter in sequence along the internal water flow direction.

4. The flocculant preparation and maturation system according to claim 1, characterized in that, A second regulating valve is installed on the pipeline between the outlet of the mixing tank and the inlet of the flocculation tank.

5. The flocculant preparation and maturation system according to claim 1, characterized in that, The outlet of the flocculation tank is connected to a chemical discharge pipe, and a second flow meter is installed on the chemical discharge pipe.

6. The flocculant preparation and maturation system according to claim 1, characterized in that, The side walls of the mixing tank and the flocculation tank are respectively equipped with level gauges.

7. The flocculant preparation and maturation system according to claim 1, characterized in that, The outer wall of the mixing tank is equipped with a heating jacket.

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