Powdered activated carbon wet feeding system with bidirectional quantitative feeding screw

Abstract

The utility model provides a kind of powder activated carbon wet method adding system with bidirectional quantitative feeding screw, it is related to water treatment equipment technical field.The system includes bunker system, tank car unloading system, quantitative feeding and screw conveying system, A additive liquid preparation system and B additive liquid preparation system;Tank car unloading system transports powder to bunker system, the bidirectional quantitative feeding screw of quantitative feeding and screw conveying system is set in the bottom of bunker system, and its two output ends are respectively connected to two sets of additive liquid preparation system, by the forward and reverse of bidirectional quantitative feeding screw, realize the transportation of powder to any additive liquid preparation system.The utility model does not need to increase bunker to realize the one-use one-backup of additive liquid preparation system, greatly reduce equipment investment and raw material storage cost;Meanwhile, through the design of anti-bridging, dust removal, quantitative control etc., guarantee system stable operation and powder accurate addition, suitable for various water purification plant powder activated carbon wet method adding scene.

Description

Technical Field

[0001] This utility model relates to the field of water treatment equipment technology, and in particular to a wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw. Background Technology

[0002] In the water treatment industry, powdered activated carbon, with its porous structure and adsorption properties, is widely used to adsorb impurities and decolorize water. In the water purification industry, it is often used as an emergency addition material to address issues such as odors, algal toxins, and excessive heavy metals in water. With increasing emphasis on drinking water safety and the combined use of powdered activated carbon with agents such as ozone and potassium permanganate, the application of powdered activated carbon dosing equipment in water purification plants is becoming increasingly widespread.

[0003] Currently, the main methods for adding powdered activated carbon are dry and wet methods. Regardless of the method used, precise quantitative delivery of powdered activated carbon is essential to ensure the stable operation of the entire dosing system. Existing technologies, such as the powdered activated carbon dosing schemes disclosed in patent documents CN114314731A and CN223033162U, all employ a structural design of "one set of dosing solution preparation system paired with one silo system"—that is, one set of equipment corresponds to one silo. If a backup dosing solution preparation device is set up to ensure system reliability, an additional matching silo system is required. This design has significant drawbacks: firstly, the additional silo significantly increases equipment investment costs, making it uneconomical for smaller water treatment plants with lower activated carbon usage; secondly, the backup silo needs to store powdered activated carbon simultaneously, easily leading to raw material accumulation and waste, and increasing the management difficulty during raw material storage. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a wet powder activated carbon dosing system with a bidirectional quantitative feeding screw, which solves the problems of existing powder activated carbon dosing systems where "one set of dosing solution preparation system requires a matching silo" and "additional silos are needed when setting up backup equipment, resulting in high investment and raw material waste."

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw includes a silo system, a tanker unloading system, a quantitative feeding and screw conveying system, an A dosing solution preparation system, and a B dosing solution preparation system.

[0006] The tanker unloading system uses pneumatic conveying. Its output end is connected to the feed end of the silo system through a pneumatic conveying pipeline to transport the powdered activated carbon in the tanker to the silo system. The silo system includes a hopper, an anti-bridging homogenizing device, a flap valve, a dust removal system, a safety valve, and a level switch. The anti-bridging homogenizing device (optional vibrator structure to prevent powder agglomeration and bridging) is provided in two sets, installed in the middle and lower part of the outer wall of the hopper respectively. The flap valve (optional electric flap valve for easy automated control of opening and closing) is located at the bottom outlet of the hopper. The dust removal system (optional pulse bag dust collector for efficient handling of unloading dust), the safety valve, and the level switch are all installed on the hopper. The dust removal system is used to handle the dust generated in the hopper during tanker unloading. The safety valve is used to balance the pressure in the hopper to prevent excessive pressure. The level switch is used to monitor the liquid level of the powder in the hopper in real time to prevent powder overflow or empty hopper.

[0007] The quantitative feeding and screw conveying system is located at the bottom of the silo system, including a bidirectional quantitative feeding screw, an A-dosing liquid preparation system screw conveyor, and a B-dosing liquid preparation system screw conveyor. The bidirectional quantitative feeding screw is equipped with a variable frequency drive motor (for easy speed adjustment to control the feeding amount and achieve precise metering). The drive motor can rotate in either the forward or reverse direction. The feed end of the bidirectional quantitative feeding screw is connected to the output end of the flap valve at the bottom of the hopper. Both the A-dosing liquid preparation system screw conveyor and the B-dosing liquid preparation system screw conveyor can be shaftless screw conveyors (to reduce the risk of powder blockage during conveying). One end of the A-dosing liquid preparation system screw conveyor is connected to one output end of the bidirectional quantitative feeding screw, and the other end is connected to the A-dosing liquid preparation system powder and carbon inlet. One end of the B-dosing liquid preparation system screw conveyor is connected to the other output end of the bidirectional quantitative feeding screw, and the other end is connected to the B-dosing liquid preparation system powder and carbon inlet.

[0008] Both the A and B dosing solution preparation systems are equipped with water mist dust removal devices (optional high-pressure atomizing nozzles, producing fine droplets with wide coverage) at their feed inlets to reduce dust generated when powder enters the dosing solution preparation system. Both dosing solution preparation systems have built-in stirring devices and flow control components, enabling the powder and water to be mixed in a fixed ratio (the mixing ratio can be adjusted according to the water purification process requirements, and the water inflow is precisely controlled by a flow meter), thereby preparing powdered activated carbon liquid that meets the dosing requirements.

[0009] Compared with the prior art, the present invention has the following beneficial effects: 1. Backup function can be achieved without adding a silo: Through the bidirectional operation of the bidirectional quantitative feeding screw, combined with two sets of dosing liquid preparation systems, the function of "one silo supplies one set of dosing liquid preparation systems for use and one set for backup" can be achieved. This avoids the problem of needing to add a silo for backup equipment in the existing technology, and greatly reduces the equipment investment cost. It is especially suitable for water purification plants with a small amount of activated carbon.

[0010] 2. Reduce raw material waste: Only one silo is needed to store powdered activated carbon, eliminating the need to store raw materials separately for the backup dosing system, thus avoiding raw material accumulation and waste, and reducing the management difficulty in the raw material storage process.

[0011] 3. Stable system operation and precise quantitative control: The bidirectional quantitative feeding screw is equipped with a variable frequency drive motor, which can adjust the feeding amount according to process requirements to ensure quantitative conveying of powder; the combined use of anti-bridging homogenizing device and flap valve avoids powder agglomeration and bridging, ensuring stable powder falling; the setting of water mist dust removal device and silo dust removal system reduces dust pollution and improves the cleanliness of the system operating environment. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a diagram of the overall system structure. Figure 2 This is a structural diagram of a bidirectional quantitative feeding screw; The system includes: 1. Silo system; 2. Tanker unloading system; 3. Quantitative feeding and screw conveying system; 4. A-dosing solution preparation system; 5. B-dosing solution preparation system; 6. Hopper 101; 7. Anti-bridging homogenizing device; 8. Flip valve 103; 9. Bidirectional quantitative feeding screw 301; 10. Powder and carbon inlet of A-dosing solution preparation system; 11. Screw conveyor of A-dosing solution preparation system; 12. Screw conveyor of B-dosing solution preparation system; 13. Powder and carbon inlet of B-dosing solution preparation system; 14. Powder and carbon inlet of B-dosing solution preparation system. Detailed Implementation

[0013] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0014] like Figure 1 , 2 As shown, a wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw includes a silo system 1, a tanker unloading system 2, a quantitative feeding and screw conveying system 3, an A dosing solution preparation system 4, and a B dosing solution preparation system 5. The components are connected in a coordinated manner according to their functions to form a complete process of "unloading-storage-quantitative conveying-dosing solution preparation". The quantitative feeding and screw conveying system 3 is the core to realize "one silo with two preparation systems", and the bidirectional quantitative feeding screw 301 contained therein is a key component for switching the direction of powder conveying.

[0015] The tank truck unloading system 2 uses a Roots blower as the pneumatic conveying power source and is equipped with a DN150 pneumatic conveying pipeline. One end of the pipeline is sealed to the unloading port of the incoming tank truck, and the other end is connected to the top inlet of the hopper 101 of the silo system 1. The powdered activated carbon in the tank truck is accurately conveyed to the silo system 1 through pneumatic conveying.

[0016] The silo system 1 includes a hopper 101, an anti-bridging homogenizing device 102, and a flap valve 103. It is also equipped with a dust removal system, a safety valve, and a material level switch. All components work together to ensure stable storage and output of powder materials. The hopper 101 is made of stainless steel and has a volume of 5m³. Its smooth inner wall reduces powder adhesion and serves as a storage carrier for powdered activated carbon. The anti-bridging homogenizing device 102 is a vibrator structure, with two sets installed in the middle and lower part of the outer wall of the hopper 101. It is used to break up powder that may clump in the hopper 101 and prevent powder from bridging. The flap valve 103 is an electric flange type flap valve with a nominal diameter of DN200. It is installed at the bottom outlet of the hopper 101 and is automatically opened and closed through the PLC control system to control the falling of the powder in the hopper 101 to the quantitative feeding and screw conveying system 3. The dust removal system is a pulse bag filter with a filtration area of ​​5㎡. It is installed on the top of the hopper 101 and connected to the inside of the hopper 101. It is used to treat the dust generated in the hopper 101 when the tanker is unloading and to prevent the dust from overflowing. The safety valve is a spring-loaded safety valve with a nominal pressure of 0.1 MPa. It is installed on the top side of the hopper 101 to balance the pressure inside the hopper 101 and prevent the hopper 101 from being damaged by excessive pressure. The level switch is an ultrasonic level gauge with a measurement range of 0-5m. It is installed at the top center of hopper 101 and transmits the level signal to the PLC control system in real time to monitor the powder level in hopper 101 and prevent powder from overflowing or the hopper from becoming empty.

[0017] The quantitative feeding and screw conveyor system 3 is located at the bottom of the silo system 1, including a bidirectional quantitative feeding screw 301, a screw conveyor for the A dosing liquid preparation system 303, and a screw conveyor for the B dosing liquid preparation system 304. It is the core for realizing the switching and conveying of powder to the two dosing liquid preparation systems. The bidirectional quantitative feeding screw 301 has a screw diameter of 200mm and a length of 1500mm. It is made of stainless steel and is equipped with a 1.5kW variable frequency drive motor. The drive motor can rotate in both directions and in the opposite direction. The speed can be adjusted within the range of 0-1500r / min. The powder conveying amount is controlled by adjusting the speed to achieve precise quantitative feeding. The feed end of the bidirectional quantitative feeding screw 301 is connected to the output end of the flap valve 103 at the bottom of the hopper 101 to receive the powder falling from the hopper 101. The screw conveyor 303 of the A dosing solution preparation system is a shaftless screw conveyor with a screw diameter of 150mm, a length of 2000mm, and is made of stainless steel. It is equipped with a 0.75kW drive motor. One end of the screw is connected to one output end of the bidirectional quantitative feeding screw 301, and the other end is connected to the powder and carbon inlet 302 of the A dosing solution preparation system 4. It is used to transfer the powder conveyed by the bidirectional quantitative feeding screw 301 to the A dosing solution preparation system 4. The screw conveyor 304 of the B dosing solution preparation system has the same structure as the screw conveyor 303 of the A dosing solution preparation system. One end of the screw conveyor is connected to the other output end of the bidirectional quantitative feeding screw 301, and the other end is connected to the powder and carbon inlet 305 of the B dosing solution preparation system 5. It is used to transfer the powder conveyed by the bidirectional quantitative feeding screw 301 to the B dosing solution preparation system 5.

[0018] The A-dosing solution preparation system 4 and the B-dosing solution preparation system 5 have completely identical structures, both possessing the functions of "water mist dust removal" and "powder-water proportional mixing," with the specific configurations as follows: Both systems include a 1m³ stainless steel mixing tank, a 0.5kW stirring motor (1000r / min), an electromagnetic water inlet flow meter (range 0-5m³ / h), and a water mist dust removal device (high-pressure atomizing nozzle, working pressure 0.3MPa). The water mist dust removal device is installed above the feed inlet of the mixing tank (i.e., the powder and carbon inlet 302 of the A dosing liquid preparation system 4 and the powder and carbon inlet 305 of the B dosing liquid preparation system 5) to reduce the dust generated when the powder enters the mixing tank. The inlet flow meter is installed on the inlet pipe of the mixing tank, and the stirring motor is installed on the top of the mixing tank with the stirring paddle extending into the tank. During operation, the inlet flow meter controls the inlet water volume according to the set solid-liquid ratio (e.g., 1:5). After the powder and water enter the mixing tank simultaneously, the stirring motor starts to mix the two evenly.

[0019] The system in this embodiment achieves stable operation through three stages: "unloading and storage - main system operation - backup system switching".

[0020] (1) Unloading and storage stage: ensuring sufficient raw materials After the tanker truck stops, the pneumatic conveying pipeline of the tanker truck unloading system 2 is sealed and connected to the tanker truck unloading port; the Roots blower is started, and the powdered activated carbon is conveyed to the hopper 101 of the silo system 1 through pneumatic conveying; during the unloading process, the dust removal system (pulse bag dust collector) at the top of the hopper 101 is started to handle the dust; the safety valve balances the pressure inside the hopper 101; the material level switch monitors the material level in real time, and when the material level reaches 80% of the volume of the hopper 101, the PLC control system automatically stops the Roots blower to complete the unloading and storage.

[0021] (2) The main operating stage of the A dosing liquid preparation system 4: directional conveying and mixing.

[0022] When powdered activated carbon needs to be added to the water purification process, the A dosing solution preparation system 4 is selected as the main equipment, and the PLC control system issues the following instructions: The flap valve 103 at the bottom of the hopper 101 is opened, and at the same time the anti-bridging homogenizing device 102 is activated to disperse the powder and ensure that it falls stably into the bidirectional quantitative feeding screw 301. The variable frequency drive motor of the bidirectional quantitative feeding screw 301 rotates in the forward direction (if a powder conveying capacity of 50 kg / h is required, the speed is adjusted to 800 r / min), conveying the powder to the screw conveyor 303 of the A dosing liquid preparation system; The screw conveyor 303 of the A dosing solution preparation system is started, and the powder is sent into the mixing tank of the A dosing solution preparation system 4 through the powder and carbon inlet 302. At the same time, the water mist dust removal device is started, the water inlet flow meter controls the water inlet, the stirring motor starts to mix the powder and water, and the prepared dosing liquid is transported to the water purification process dosing point through the discharge pump.

[0023] (3) Switching stage of B dosing solution preparation system 5 as the main system: realize one in use and one in standby.

[0024] When the A dosing solution preparation system 4 requires maintenance or repair, the system switches to the B dosing solution preparation system 5 as the primary system, achieving a one-in-one-backup mode. The PLC control system stops the forward rotation of the bidirectional quantitative feeding screw 301 and the operation of the screw conveyor 303 of the A dosing solution preparation system, and shuts off the water inlet pipe of the A dosing solution preparation system 4. The drive motor of the bidirectional quantitative feeding screw 301 rotates in the opposite direction (the speed is adjusted according to the feeding amount), the anti-bridging homogenizing device 102 continues to work, the flap valve 103 remains open, and the powder falls into the bidirectional quantitative feeding screw 301 and is then transported to the screw conveyor 304 of the B dosing liquid preparation system. The screw conveyor 304 of the B dosing solution preparation system is started, and the powder is sent into the mixing tank of the B dosing solution preparation system 5 through the powder and carbon inlet 305. Subsequently, the water mist dust removal device, water inlet flow meter and stirring motor of the B dosing solution preparation system 5 are started in sequence to complete the preparation of the dosing solution and transport it to the dosing point, realizing seamless switching between the two systems.

[0025] The A dosing solution preparation system 4 and the B dosing solution preparation system 5 adopt a one-in-one standby operation mode. The two dosing solution preparation systems can be used alternately by switching the direction of the bidirectional quantitative feeding screw 301.

[0026] Through the above structural design and operation control, the system in this embodiment can realize the backup function of the dosing liquid preparation system without adding a material silo, which greatly reduces equipment investment and raw material storage costs, while ensuring accurate powder dosage and stable operation. It is suitable for wet dosing scenarios of powdered activated carbon in various water purification plants.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw, characterized in that, The system includes a silo system (1), a tanker unloading system (2), a quantitative feeding and screw conveying system (3), an A-dosing solution preparation system (4), and a B-dosing solution preparation system (5). The output end of the tanker unloading system (2) is connected to the feed end of the silo system (1) to transport powdered activated carbon into the silo system (1). The quantitative feeding and screw conveying system (3) is located at the bottom of the silo system (1) and includes a bidirectional quantitative feeding screw (301). The two output ends of the bidirectional quantitative feeding screw (301) are respectively connected to the A-dosing solution preparation system (4) and the B-dosing solution preparation system (5). Through the bidirectional operation of the bidirectional quantitative feeding screw (301), the powder is transported to the A-dosing solution preparation system (4) or the B-dosing solution preparation system (5).

2. The wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw as described in claim 1, characterized in that, The silo system (1) includes a hopper (101), an anti-bridging homogenizing device (102), and a flap valve (103); the anti-bridging homogenizing device (102) is installed on the outer wall of the hopper (101), and the flap valve (103) is located at the bottom outlet of the hopper (101), and the output end of the flap valve (103) is connected to the feed end of the bidirectional quantitative feeding screw (301).

3. The wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw as described in claim 2, characterized in that, Two sets of the anti-bridging homogenizing device (102) are provided, one above the other on the middle and one below the outer wall of the hopper (101).

4. The wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw as described in claim 2, characterized in that, The silo system (1) also includes a dust removal system, a safety valve and a level switch; the dust removal system, the safety valve and the level switch are all installed on the hopper (101). The dust removal system is used to handle the dust generated when the silo system (1) is unloading. The safety valve is used to balance the pressure in the hopper (101). The level switch is used to monitor the powder level in the hopper (101).

5. The wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw as described in claim 1, characterized in that, Both the inlet of the A dosing solution preparation system (4) and the inlet of the B dosing solution preparation system (5) are equipped with water mist dust removal devices, which are used to reduce dust generated when powder enters the dosing solution preparation system.

6. The wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw as described in claim 1, characterized in that, The bidirectional quantitative feeding screw (301) is equipped with a drive motor, which can rotate in both the forward and reverse directions. When the drive motor rotates in the forward direction, the bidirectional quantitative feeding screw (301) delivers powder to the A dosing liquid preparation system (4). When the drive motor rotates in the reverse direction, the bidirectional quantitative feeding screw (301) delivers powder to the B dosing liquid preparation system (5).

7. The wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw as described in claim 5, characterized in that, The quantitative feeding and screw conveying system (3) further includes a screw conveyor (303) for the A dosing liquid preparation system and a screw conveyor (304) for the B dosing liquid preparation system; one end of the screw conveyor (303) for the A dosing liquid preparation system is connected to one output end of the bidirectional quantitative feeding screw (301), and the other end is connected to the powder carbon inlet (302) of the A dosing liquid preparation system (4); one end of the screw conveyor (304) for the B dosing liquid preparation system is connected to the other output end of the bidirectional quantitative feeding screw (301), and the other end is connected to the powder carbon inlet (305) of the B dosing liquid preparation system (5).

8. The wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw as described in claim 1, characterized in that, The tanker unloading system (2) adopts a pneumatic conveying method, which conveys the powdered activated carbon in the tanker to the silo system (1) through a pneumatic conveying pipeline.

9. The wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw as described in claim 1, characterized in that, The A dosing solution preparation system (4) and the B dosing solution preparation system (5) adopt a one-in-one-in-standby operation mode. The two dosing solution preparation systems can be used alternately by switching the direction of the bidirectional quantitative feeding screw (301).

10. The wet dosing system for powdered activated carbon with a bidirectional quantitative feeding screw as described in claim 1, characterized in that, When the bidirectional quantitative feeding screw (301) delivers powder to the A dosing liquid preparation system (4) or the B dosing liquid preparation system (5), the anti-bridging homogenizing device (102) is activated and cooperates with the opening and closing action of the flap valve (103).

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