An automatic preparation system and method of a hydraulic circulating flocculant

Abstract

The application provides a kind of hydraulic cycle flocculant automatic preparation system and method, belongs to flocculant preparation technical field.The system includes powder adding module, preparation module, storage conveying module and intelligent control module, powder adding module is located in the space above preparation module, preparation module is located in the upstream of storage conveying module, and intelligent control module controls the whole system.In the system, flocculant solution is prepared by the double flow field action of mechanical stirring and hydraulic cycle, and the flocculant powder relies on the hydraulic flow field to circulate backflow in the preparation module.In the circulation process, the flocculant powder is also fully diffused and dissolved under the action of mechanical stirring, so that the mixing state of the flocculant preparation is more uniform, the hydraulic dead zone is smaller, which is beneficial to the dissolution and growth of flocculant molecules, and improves the preparation efficiency and quality of flocculant.The system realizes the intelligent preparation of flocculant solution, can effectively help the efficient flocculation of tailings, promotes the development of paste filling technology, and realizes the resource utilization of mine solid waste.

Description

Technical Field

[0001] This invention relates to the field of flocculant preparation technology, and in particular to an automated system and method for preparing hydraulically circulating flocculants. Background Technology

[0002] Mine tailings are often used in thickening technology to ultimately achieve solid waste resource utilization. To improve the settling speed and thickening efficiency of tailings, a flocculant polymer solution is added to the tailings slurry. Under the action of flocculation and gravity, the tailings particles increase in size and settle rapidly. Efficient flocculation of tailings is the prerequisite and core for achieving deep thickening and dewatering. In actual production, the preparation of flocculant solutions presents several problems: First, the flocculant powder feed pipe is often located close to the preparation chamber, where moisture is easily generated during stirring. This causes the flocculant powder in the chamber and feed pipe to become damp, clump together, and prematurely degrade, affecting the flocculation effect. Second, conventional flocculant preparation systems rely solely on the mechanical shearing action generated by the stirring device. When the stirring speed is too low, the flocculant molecules cannot diffuse sufficiently, resulting in uneven stirring. The stirring vortex only exists in the center of the preparation chamber, leading to a large "dead zone" and low utilization. Although the overall flow rate of the stirring field increases with the stirring speed, driving a wider range of fluids and reducing the dead zone in the container, the increased stirring speed also causes excessive shearing intensity in the flow field, which can easily lead to excessive shearing and damage to the long-chain structure of polymers. Both excessively high and low stirring speeds will affect the flocculation effect. Meanwhile, the stirring device often has a circulation blind zone, and some flocculant powder is discharged into the thickener without being fully stirred, resulting in poor flocculation effect; third, most flocculant preparation systems at present cannot effectively monitor the addition of materials, and the preparation process is highly dependent on human control and experience regulation. Digital intelligent preparation of flocculants has not yet been realized, resulting in serious lag in production management.

[0003] Therefore, it is extremely important to invent an automatic preparation system and method for hydraulically circulating flocculants. This system adds an additional, gentler circulating flow field through a hydraulic circulation pipe. The flocculant powder circulates back and forth in the preparation chamber by the hydraulic flow field. During the circulation process, the flocculant molecules are fully dispersed and dissolved under the action of mechanical stirring. In addition, by optimizing the powder hopper feeding device and adding a moisture-proof device and a uniform distribution device, the flocculant powder is prevented from clumping and failing, and the flocculant particles are ensured to diffuse fully in the preparation chamber. This invention also provides a control loop suitable for this system, realizing the intelligent preparation of flocculant solutions, assisting in the efficient flocculation of tailings, promoting the development of paste filling technology, and realizing the resource utilization of mine solid waste. Summary of the Invention

[0004] This invention provides an automated system and method for preparing hydraulically circulating flocculants.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] An automated preparation system for a hydraulically circulating flocculant includes a powder addition module, a preparation module, a storage and conveying module, and an intelligent control module. The powder addition module is located above the preparation module, and the preparation module is located upstream of the storage and conveying module.

[0007] The powder addition module includes a powder hopper, a micro powder scale, a screw conveyor, and a moisture-proof distributor.

[0008] The preparation module includes a water inlet pipe, a preparation chamber, a circulation pump, a hydraulic circulation pipe, a spiral stirrer, and a filter screen.

[0009] The material storage and conveying module includes a material storage bin.

[0010] The intelligent control module includes a material level gauge for the preparation silo, a high-level material level gauge, a low-level material level gauge, an electromagnetic flow meter, a solenoid valve, and a PLC intelligent control platform;

[0011] The preparation chamber has a straight upper section and a conical lower section.

[0012] The micro powder scale is placed at the outlet of the powder silo, and a screw conveyor is installed at the bottom of the micro powder scale. A moisture-proof distributor is installed at the discharge port of the screw conveyor. The moisture-proof distributor is placed at the top of the preparation silo. A screw agitator is vertically installed downward at the center of the top of the preparation silo. A preparation silo level gauge is installed at the top of the inner wall of the preparation silo.

[0013] The water inlet pipe is located at the top center of the preparation chamber, and the hydraulic circulation pipe is installed on the side wall of the preparation chamber. The hydraulic circulation pipe includes a high-level circulation pipe and a low-level circulation pipe. The high-level circulation pipe is installed on the straight cylindrical side wall of the preparation chamber, and the low-level circulation pipe is installed on the conical side wall of the preparation chamber. The high-level circulation pipe and the low-level circulation pipe are connected by a circulation pump.

[0014] A filter screen is installed at the bottom of the preparation chamber. The bottom outlet of the preparation chamber is connected to the storage chamber through a pipe. A high-level level gauge is installed on the upper part of the inner wall of the storage chamber, and a low-level level gauge is installed on the lower part of the inner wall of the storage chamber. A solenoid valve is installed at the bottom outlet of the storage chamber, and an electromagnetic flow meter is installed at the solenoid valve.

[0015] The bottom of the powder hopper is conical, with a cone angle of 45° to 60°. The flocculant powder is released into the screw conveyor by gravity.

[0016] The screw conveyor is a closed conveying pipeline. The discharge pipe of the screw conveyor is located above the center of the preparation chamber, and the discharge pipe is 10-20cm away from the top of the preparation chamber. It is strictly forbidden to extend into the preparation chamber.

[0017] An electric lifting rail is installed on the outer wall of the feed pipe of the screw conveyor.

[0018] The moisture-proof distributor is installed on the electric lifting rail of the screw conveyor's feed pipe, enabling the moisture-proof distributor to move up and down.

[0019] The moisture-proof distributor has a conical structure with a cone angle of 90° to 120°.

[0020] The preparation chamber is a straight cylindrical chamber with a conical bottom, the bottom cone angle being 90° to 120°.

[0021] The filter screen has a mesh size of 0.5cm × 0.5cm and is installed at the junction of the cone and the cylinder inside the preparation chamber.

[0022] The water inlet pipe includes a main water inlet pipe and water inlet pipe nozzles. The main water inlet pipe is horizontally installed at the center of the top of the preparation chamber. The water inlet pipe nozzles are symmetrically distributed around the feed pipe of the screw conveyor and are vertically installed on the main water inlet pipe. The outlet of the water inlet pipe nozzles is lower than the outlet of the feed pipe and extends into the interior of the preparation chamber. An electromagnetic flow meter and a solenoid valve are installed on the main water inlet pipe.

[0023] The preparation module is located upstream of the storage and conveying module. Depending on the installation positions of both, gravity conveying or pump-pressurized conveying can be selected.

[0024] An electromagnetic flow meter and a solenoid valve are installed on the conveying pipe between the preparation chamber and the storage chamber.

[0025] The fluid in the preparation chamber flows out through the high-level circulation pipe, is pumped by the circulation pump to the low-level circulation pipe, and then re-enters the preparation chamber.

[0026] The high-level circulation pipe extends upward from the circulation pump, closely adhering to the outer wall of the straight section of the preparation chamber, and then inserts into the preparation chamber vertically from the straight section wall when it reaches the installation height of the material level gauge in the preparation chamber.

[0027] The low-level circulation pipe extends downward from the circulation pump, closely adhering to the outer wall of the straight section of the preparation chamber. When it reaches the bottom of the straight section, it slopes downward along the outer wall of the bottom cone and then inserts vertically into the preparation chamber. At the same time, it ensures that the end of the low-level circulation pipe is installed below the horizontal plane of the filter screen, so that the agglomerated flocculant intercepted by the filter screen can be recirculated by the low-level circulating water flow and re-enter the stirring flow field.

[0028] The application method of this system includes the following steps:

[0029] S1. The parameters of flocculant consumption, flocculant solution concentration, stirrer speed and stirring time are given to the PLC intelligent control platform. The PLC analyzes and calculates the flocculant powder addition amount and the water addition flow rate based on the set parameters and the production data fed back from the upstream and downstream processes.

[0030] S2. The preparation module opens the inlet solenoid valve and the spiral stirrer, and uses an electromagnetic flow meter to detect the amount of water to be prepared. The detected water volume data signal is transmitted to the PLC. The PLC compares the set value of the water volume to the detected value, and then outputs a signal to adjust the opening of the solenoid valve to control the amount of water added. The liquid level in the preparation tank is monitored by a material level gauge. The monitored liquid level data signal is transmitted to the PLC. When the liquid level reaches the warning value, the PLC outputs a signal to close the solenoid valve and stop the water intake.

[0031] S3. After the preparation water is added to the preparation chamber, the PLC controls the powder addition module to start the screw conveyor. The moisture-proof distributor descends along the track and opens the feeding pipe. The amount of flocculant powder is detected by the micro powder scale. The detected flocculant powder amount data signal is transmitted to the PLC. The PLC compares the powder amount setpoint with the detected value and then outputs a signal to adjust the feeding amount of the screw conveyor. When the set amount of powder is added, the PLC controls the screw conveyor to stop, and at the same time, the moisture-proof distributor rises along the track to close the feeding pipe.

[0032] S4. While adding flocculant powder to the preparation chamber, the PLC controls the hydraulic circulation pipe circulation pump to start simultaneously. Due to the rotation of the spiral stirrer, a vortex is formed in the central area of ​​the preparation chamber, driving the fluid to flow towards the wall, and the flocculant powder diffuses rapidly. The fluid flowing towards the wall flows out from the high-level circulation pipe under the backflow of the hydraulic circulation pipe, and flows back into the preparation chamber from the low-level circulation pipe via the circulation pump. The flocculant molecules and the undissolved flocculant colloids intercepted by the filter screen re-enter the central stirring flow field under the action of the return water flow in the low-level circulation pipe, and undergo a second thorough stirring.

[0033] S5. When the stirring time reaches the given value, the PLC controls the solenoid valve of the preparation chamber delivery pipe to open, and the prepared flocculant solution is discharged into the storage silo by gravity or pump for later use. The amount of flocculant solution is detected by an electromagnetic flowmeter, and the detected solution amount data signal is transmitted to the PLC. The PLC compares the given solution amount with the detected value and then outputs a signal to adjust the opening of the solenoid valve. The liquid level in the storage silo is monitored by high-level and low-level level gauges, and the monitored liquid level data signal is transmitted to the PLC. When the liquid level reaches the highest liquid level warning value, the PLC outputs a control signal to close the solenoid valve. When the liquid level reaches the lowest liquid level warning value, the PLC outputs a signal to open the powder addition module and the preparation module to start the preparation of the flocculant solution.

[0034] S6. When the PLC receives the instruction to start the thickener, the PLC controls the solenoid valve of the material storage silo conveying pipe to open; the solution volume is detected by an electromagnetic flow meter, and the detected solution volume data signal is transmitted to the PLC. The PLC compares the set value of the solution volume with the detected value, and then outputs a signal to adjust the opening degree of the solenoid valve to control the discharge flow rate of the flocculant solution.

[0035] The above technical solution has at least the following advantages compared with the existing technology:

[0036] The above scheme constructs a dual flow field mechanism of "hydraulic circulation + mechanical shearing". The flocculant powder circulates back in the preparation chamber by relying on the hydraulic flow field. During the circulation process, the flocculant powder particles are fully dispersed and dissolved under the action of mechanical stirring. In addition, the device optimizes the flocculant powder feeding device to ensure physical moisture protection and uniform distribution of flocculant. The present invention also provides a control loop suitable for this system, realizing intelligent preparation of flocculant solution, effectively assisting in the efficient flocculation of tailings, promoting the development of paste filling technology, and realizing the resource utilization of mine solid waste. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the automatic preparation system for hydraulically circulating flocculant according to the present invention;

[0039] Figure 2 This is a schematic diagram of the control loop of an automatic preparation system for hydraulically circulating flocculant according to the present invention.

[0040] The components are: 1-Powder silo; 2-Micro powder scale; 3-Screw conveyor; 4-Moisture-proof distributor; 5a-Main water inlet pipe; 5b-Water inlet pipe nozzle; 6-Preparation silo; 7-Screw agitator; 8-Filter screen; 9-Circulation pump; 10a-High-level circulation pipe; 10b-Low-level circulation pipe; 11-Storage silo; 12-Preparation silo level gauge; 13-High-level level gauge; 14-Low-level level gauge; 15-Electromagnetic flow meter; 16-Solenoid valve. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] This invention provides an automated system and method for preparing hydraulically circulating flocculants.

[0043] like Figure 1 As shown, the preparation system includes a powder addition module, a preparation module, a material storage and conveying module, and an intelligent control module. The powder addition module is located above the preparation module space, and the preparation module is located upstream of the material storage and conveying module.

[0044] The powder addition module includes a powder hopper 1, a micro powder scale 2, a screw conveyor 3, and a moisture-proof distributor 4.

[0045] The preparation module includes a water inlet pipe, a preparation chamber 6, a circulation pump 9, a hydraulic circulation pipe, a spiral stirrer 7, and a filter screen 8.

[0046] The material storage and conveying module includes a material storage bin 11.

[0047] The intelligent control module includes a material level gauge 12, a high-level material level gauge 13, a low-level material level gauge 14, an electromagnetic flow meter 15, a solenoid valve 16, and a PLC intelligent control platform.

[0048] The micro powder scale 2 is placed at the outlet of the powder silo 1. A screw conveyor 3 is installed at the bottom of the micro powder scale 2. A moisture-proof distributor 4 is installed at the discharge port of the screw conveyor 3. The moisture-proof distributor 4 is placed at the top of the preparation silo 6. A screw agitator 7 is vertically installed downward at the center of the top of the preparation silo 6. A preparation silo level gauge 12 is installed at the top of the inner wall of the preparation silo 6.

[0049] The water inlet pipe is located at the top center of the preparation chamber 6, and the hydraulic circulation pipe is installed on the side wall of the preparation chamber 6. The hydraulic circulation pipe includes a high-level circulation pipe 10a and a low-level circulation pipe 10b. The high-level circulation pipe 10a is installed on the straight side wall of the preparation chamber, and the low-level circulation pipe 10b is installed on the conical side wall of the preparation chamber. The high-level circulation pipe 10a and the low-level circulation pipe 10b are connected by a circulation pump 9.

[0050] A filter screen 8 is installed at the bottom of the preparation chamber 6. The bottom outlet of the preparation chamber 6 is connected to the storage chamber 11 through a pipe. A high-level material level gauge 13 is installed on the upper part of the inner wall of the storage chamber, and a low-level material level gauge 12 is installed on the lower part of the inner wall of the storage chamber. A solenoid valve 16 is installed at the bottom outlet of the storage chamber, and an electromagnetic flow meter 15 is installed at the solenoid valve 16.

[0051] In the specific design, the bottom of the powder silo is conical with a cone angle of 50°, and the flocculant powder is released to the screw conveyor by gravity.

[0052] The screw conveyor is a closed conveying pipeline. The discharge pipe of the screw conveyor is located above the center of the preparation chamber and is 15cm away from the top of the preparation chamber to ensure that the discharge pipe does not extend into the preparation chamber.

[0053] An electric lifting rail is installed on the outer wall of the feed pipe of the screw conveyor.

[0054] The moisture-proof distributor is installed on the electric lifting rail of the screw conveyor's discharge pipe, enabling the moisture-proof distributor to move up and down.

[0055] The moisture-proof distributor has a conical structure with a cone angle of 100°.

[0056] The preparation chamber is a straight cylindrical chamber with a conical bottom and a cone angle of 100°.

[0057] The filter screen has a mesh size of 0.5cm × 0.5cm and is installed at the junction of the cone and the straight cylinder inside the preparation chamber.

[0058] The water inlet pipe includes a main water inlet pipe 5a and a water inlet pipe nozzle 5b. The main water inlet pipe is horizontally installed at the center of the top of the preparation chamber. The water inlet pipe nozzles are symmetrically distributed around the feed pipe of the screw conveyor and are vertically installed on the main water inlet pipe. The outlet of the water inlet pipe nozzles is lower than the outlet of the feed pipe and extends into the interior of the preparation chamber.

[0059] An electromagnetic flow meter and a solenoid valve are installed on the main inlet pipe. The preparation module can be located upstream of the storage and conveying module. Depending on the installation positions of both, gravity conveying or pump-pressurized conveying can be selected. An electromagnetic flow meter and a solenoid valve are installed on the conveying pipe between the preparation chamber and the storage chamber.

[0060] like Figure 2 As shown, the application method of this system includes the following steps:

[0061] S1. The parameters of flocculant consumption, flocculant solution concentration, stirrer speed and stirring time are given to the PLC intelligent control platform. The PLC analyzes and calculates the flocculant powder addition amount and the water addition flow rate based on the set parameters and the production data fed back from the upstream and downstream processes.

[0062] S2. The preparation module opens the inlet solenoid valve and the spiral stirrer, and uses an electromagnetic flow meter to detect the amount of water to be prepared. The detected water volume data signal is transmitted to the PLC. The PLC compares the set value of the water volume to the detected value, and then outputs a signal to adjust the opening of the solenoid valve to control the amount of water added. The liquid level in the preparation tank is monitored by a material level gauge. The monitored liquid level data signal is transmitted to the PLC. When the liquid level reaches the warning value, the PLC outputs a signal to close the solenoid valve and stop the water intake.

[0063] S3. After the preparation water is added to the preparation chamber, the PLC controls the powder addition module to start the screw conveyor. The moisture-proof distributor descends along the track and opens the feeding pipe. The amount of flocculant powder is detected by the micro powder scale. The detected flocculant powder amount data signal is transmitted to the PLC. The PLC compares the powder amount setpoint with the detected value and then outputs a signal to adjust the feeding amount of the screw conveyor. When the set amount of powder is added, the PLC controls the screw conveyor to stop, and at the same time, the moisture-proof distributor rises along the track to close the feeding pipe.

[0064] S4. While adding flocculant powder to the preparation chamber, the PLC controls the hydraulic circulation pipe circulation pump to start simultaneously. Due to the rotation of the spiral stirrer, a vortex is formed in the central area of ​​the preparation chamber, driving the fluid to flow towards the wall, and the flocculant powder diffuses rapidly. The fluid flowing towards the wall flows out from the high-level circulation pipe under the backflow of the hydraulic circulation pipe, and flows back into the preparation chamber from the low-level circulation pipe via the circulation pump. The flocculant molecules and the undissolved flocculant colloids intercepted by the filter screen re-enter the central stirring flow field under the action of the return water flow in the low-level circulation pipe, and undergo a second thorough stirring.

[0065] S5. When the stirring time reaches the given value, the PLC controls the solenoid valve of the preparation chamber delivery pipe to open, and the prepared flocculant solution is discharged into the storage silo by gravity or pump for later use. The amount of flocculant solution is detected by an electromagnetic flowmeter, and the detected solution amount data signal is transmitted to the PLC. The PLC compares the given solution amount with the detected value and then outputs a signal to adjust the opening of the solenoid valve. The liquid level in the storage silo is monitored by high-level and low-level level gauges, and the monitored liquid level data signal is transmitted to the PLC. When the liquid level reaches the highest liquid level warning value, the PLC outputs a control signal to close the solenoid valve. When the liquid level reaches the lowest liquid level warning value, the PLC outputs a signal to open the powder addition module and the preparation module to start the preparation of the flocculant solution.

[0066] S6. When the PLC receives the instruction to start the thickener, the PLC controls the solenoid valve of the material storage silo conveying pipe to open; the solution volume is detected by an electromagnetic flow meter, and the detected solution volume data signal is transmitted to the PLC. The PLC compares the set value of the solution volume with the detected value, and then outputs a signal to adjust the opening degree of the solenoid valve to control the discharge flow rate of the flocculant solution.

[0067] The following description, in conjunction with specific embodiments, illustrates this point.

[0068] Example 1

[0069] A certain mine employs a paste-filling subsequent mining method, with a paste-filling station built on the surface. This station flocculates and thickens 15% concentration tailings slurry, mixes it with cementing materials to prepare a 70% concentration paste, and backfills it into the underground goaf, ultimately achieving the resource utilization of mine solid waste. Before using this invention to optimize the flocculant preparation system, the preparation effect was poor, with undissolved flocculant powder and large, unevenly mixed flocculant colloids present; the flocculant powder was prone to moisture absorption and inactivation; on-site operation relied on manual labor, consuming significant manpower, material resources, and financial resources, and digital management of flocculant preparation was not achieved. Therefore, the flocculant preparation system was optimized and improved:

[0070] The optimized system includes a powder addition module, a preparation module, a material storage and conveying module, and an intelligent control module.

[0071] The powder addition module is located above the preparation module space and includes a powder hopper, a micro powder scale, a screw conveyor, and a moisture-proof distributor. The powder hopper has a square upper part, measuring 0.5m long, 0.5m wide, and 1m high, with a conical bottom and a cone angle of 60°. The flocculant powder is discharged to the screw conveyor by gravity. The screw conveyor's discharge pipe is located above the center of the preparation hopper, with the end of the discharge pipe 15cm from the top of the preparation hopper. The moisture-proof distributor is installed on the electric lifting track of the screw conveyor's discharge pipe, with a cone angle of 100°.

[0072] The preparation module is located above the storage and conveying module and includes a water inlet pipe, a preparation chamber, a circulation pump, a hydraulic circulation pipe, a spiral stirrer, and a filter screen. The upper part of the preparation chamber is a cylinder with a diameter of 1m and a height of 1.5m, while the bottom is a cone with a 120° cone angle. The filter screen has a mesh size of 0.5cm × 0.5cm and is installed at the junction of the bottom cone and the straight cylinder. Hydraulic circulation pipes are installed on the side walls of the preparation chamber; the high-level circulation pipe is located on the straight cylinder side wall, and the low-level circulation pipe is located on the conical side wall of the preparation chamber. The high-level and low-level circulation pipes are connected by the circulation pump. The storage and conveying module is located at the bottom of the entire system, and the storage chamber is 2m long, 1m wide, and 1.5m high.

[0073] The intelligent control module comprises a central control layer and an equipment layer. The central control layer is a PLC intelligent control platform. Electromagnetic flow meters and solenoid valves are installed on the main inlet pipe, the conveying pipes between the preparation silo and the storage silo, and the conveying pipes between the storage silo and the thickener. A preparation silo level gauge is installed 0.3m from the top of the preparation silo; a high-level level gauge is installed 0.3m from the top of the storage silo, and a low-level level gauge is installed 0.1m from the bottom.

[0074] During preparation, the control personnel first input key parameters for flocculant preparation, such as flocculant consumption, flocculant solution concentration, stirrer speed, and stirring time, into the PLC intelligent control platform. The PLC analyzes and calculates the flocculant powder addition amount and the preparation water flow rate based on the set parameters and the production data uploaded to the central control layer from the upstream and downstream process links.

[0075] After setting the basic control parameters, the preparation module activates the solenoid valve of the hydraulic circulation pipe and the spiral agitator. An electromagnetic flowmeter detects the amount of water being prepared, and the detected water volume data is transmitted to the PLC. The PLC compares the setpoint water volume with the detected value and then outputs a signal to adjust the opening of the solenoid valve to control the water volume. A high-level level gauge monitors the liquid level in the preparation chamber, and the monitored liquid level data is transmitted to the PLC. When the liquid level reaches a warning value, the PLC outputs a signal to close the solenoid valve.

[0076] After the preparation water is added to the preparation chamber, the PLC controls the powder addition module to start the screw conveyor, and the moisture-proof distributor simultaneously descends along the track and opens the feeding pipe. A micro-powder scale is used to detect the amount of flocculant powder. The detected flocculant powder amount data signal is transmitted to the PLC. The PLC compares the set powder amount with the detected value and then outputs a signal to adjust the feeding rate of the screw conveyor. When the set amount of powder has been conveyed, the PLC controls the screw conveyor to stop, and at the same time, the moisture-proof distributor rises along the track to close the feeding pipe, preventing moisture from rising during the mixing process and causing dampness inside the screw conveyor and clumping of the flocculant powder.

[0077] While adding flocculant powder to the preparation chamber, the PLC controls the hydraulic circulation pipe and circulation pump to start simultaneously. Due to the rotation of the spiral stirrer, a vortex is formed in the central area of ​​the preparation chamber, driving the fluid to flow towards the wall, and the flocculant powder diffuses rapidly. The fluid flowing towards the wall flows out from the high-level circulation pipe under the backflow of the hydraulic circulation pipe, and flows back into the preparation chamber from the low-level circulation pipe via the circulation pump. The flocculant molecules and the undissolved flocculant colloids intercepted by the filter screen re-enter the central stirring flow field under the action of the return water flow in the low-level circulation pipe, and undergo a second thorough stirring.

[0078] Once the stirring time reaches the given value, the PLC controls the opening of the solenoid valve at the bottom of the preparation chamber, allowing the prepared flocculant solution to flow by gravity or be pumped into the storage silo for later use. An electromagnetic flowmeter detects the amount of flocculant solution, and the detected data is transmitted to the PLC. The PLC compares the given solution volume with the detected value and then outputs a signal to adjust the opening of the solenoid valve. A level gauge monitors the liquid level in the storage silo, and the detected data is transmitted to the PLC. When the liquid level reaches the maximum warning value, the PLC outputs a control signal to close the solenoid valve; when the liquid level reaches the minimum warning value, the PLC outputs a signal to activate the powder addition module and the preparation module, initiating the preparation of the flocculant solution.

[0079] When the PLC receives the instruction to start the thickener, it controls the solenoid valve at the bottom of the storage silo to open. An electromagnetic flowmeter detects the solution volume, and the detected volume data is transmitted to the PLC. The PLC compares the setpoint solution volume with the detected value and then outputs a signal to adjust the opening of the solenoid valve, controlling the flocculant solution discharge flow rate.

[0080] The following points need to be explained:

[0081] (1) The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention. Other structures can refer to the general design.

[0082] (2) Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0083] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An automated system for preparing a hydraulically circulating flocculant, characterized in that, It includes a powder addition module, a preparation module, a material storage and conveying module, and an intelligent control module. The powder addition module is located above the preparation module space, and the preparation module is located upstream of the material storage and conveying module. The powder addition module includes a powder hopper, a micro powder scale, a screw conveyor, and a moisture-proof distributor. The preparation module includes a water inlet pipe, a preparation chamber, a spiral stirrer and filter screen, a circulation pump, and a hydraulic circulation pipe. The material storage and conveying module includes a material storage bin. The intelligent control module includes a material level gauge for the preparation silo, a high-level material level gauge, a low-level material level gauge, an electromagnetic flow meter, a solenoid valve, and a PLC intelligent control platform; The preparation chamber has a straight upper section and a conical lower section. The micro powder scale is placed at the outlet of the powder silo, and a screw conveyor is installed at the bottom of the micro powder scale. A moisture-proof distributor is installed at the discharge port of the screw conveyor. The moisture-proof distributor is placed at the top of the preparation silo. A screw agitator is vertically installed downward at the center of the top of the preparation silo. A preparation silo level gauge is installed at the top of the inner wall of the preparation silo. The water inlet pipe is located at the top center of the preparation chamber, and the hydraulic circulation pipe is installed on the side wall of the preparation chamber. The hydraulic circulation pipe includes a high-level circulation pipe and a low-level circulation pipe. The high-level circulation pipe is installed on the straight side wall of the preparation chamber, and the low-level circulation pipe is installed on the conical side wall of the preparation chamber. The high-level circulation pipe and the low-level circulation pipe are connected by a circulation pump. A filter screen is installed at the bottom of the preparation chamber. The bottom outlet of the preparation chamber is connected to the storage chamber through a pipe. A high-level material level gauge is installed on the upper part of the inner wall of the storage chamber, and a low-level material level gauge is installed on the lower part of the inner wall of the storage chamber. A solenoid valve is installed at the bottom outlet of the storage chamber, and an electromagnetic flow meter is installed at the solenoid valve. The preparation chamber is a straight cylindrical chamber with a conical bottom, the bottom cone angle being 90°~120°; The filter screen has a mesh size of 0.5cm × 0.5cm and is installed at the junction of the cone and the straight cylinder inside the preparation chamber; The water inlet pipe includes a main water inlet pipe and water inlet pipe nozzles. The main water inlet pipe is horizontally installed at the center of the top of the preparation chamber. The water inlet pipe nozzles are symmetrically distributed around the feed pipe of the screw conveyor and are vertically installed on the main water inlet pipe. The outlet of the water inlet pipe nozzles is lower than the outlet of the feed pipe and extends into the interior of the preparation chamber. An electromagnetic flow meter and a solenoid valve are installed on the main inlet pipe. The fluid in the preparation chamber flows out through the high-level circulation pipe, is pumped by the circulation pump to the low-level circulation pipe, and then re-enters the preparation chamber. The high-level circulation pipe extends upward from the circulation pump, closely adhering to the outer wall of the straight section of the preparation chamber, and then inserts into the preparation chamber vertically from the straight section wall when it reaches the installation height of the material level gauge in the preparation chamber. The low-level circulation pipe extends downward from the circulation pump, closely adhering to the outer wall of the straight section of the preparation chamber. When it reaches the bottom of the straight section, it slopes downward along the outer wall of the bottom cone and then inserts vertically into the preparation chamber. At the same time, it ensures that the end of the low-level circulation pipe is installed below the horizontal plane of the filter screen, so that the agglomerated flocculant intercepted by the filter screen can be recirculated by the low-level circulating water flow and re-enter the stirring flow field.

2. The automatic preparation system for hydraulically circulated flocculant according to claim 1, characterized in that, The bottom of the powder hopper is conical, with a cone angle of 45° to 60°. The flocculant powder is released into the screw conveyor by gravity.

3. The automatic preparation system for hydraulically circulating flocculant according to claim 1, characterized in that, The screw conveyor is a closed conveying pipeline. The discharge pipe of the screw conveyor is located above the center of the preparation chamber, and the discharge pipe is 10-20cm away from the top of the preparation chamber. An electric lifting rail is installed on the outer wall of the feed pipe of the screw conveyor.

4. The automatic preparation system for hydraulically circulated flocculant according to claim 3, characterized in that, The moisture-proof distributor is installed on the electric lifting rail of the screw conveyor's feed pipe, enabling the moisture-proof distributor to move up and down. The moisture-proof distributor has a conical structure with a cone angle of 90°~120°.

5. The automatic preparation system for hydraulically circulated flocculant according to claim 1, characterized in that, The preparation module is located upstream of the storage and conveying module. Depending on the installation positions of both, gravity conveying or pump-pressurized conveying can be selected. An electromagnetic flow meter and a solenoid valve are installed on the conveying pipe between the preparation chamber and the storage chamber.

6. The application method of the automatic preparation system for hydraulic circulating flocculant according to claim 1, characterized in that, The steps include the following: S1. The parameters of flocculant consumption, flocculant solution concentration, stirrer speed and stirring time are given to the PLC intelligent control platform. The PLC analyzes and calculates the flocculant powder addition amount and the water addition flow rate based on the set parameters and the production data fed back from the upstream and downstream processes. S2. The preparation module opens the inlet solenoid valve and the spiral stirrer, and uses an electromagnetic flow meter to detect the amount of water to be prepared. The detected water volume data signal is transmitted to the PLC. The PLC compares the set value of the water volume to the detected value, and then outputs a signal to adjust the opening of the solenoid valve to control the amount of water added. The liquid level in the preparation tank is monitored by a material level gauge. The monitored liquid level data signal is transmitted to the PLC. When the liquid level reaches the warning value, the PLC outputs a signal to close the solenoid valve and stop the water intake. S3. After the preparation water is added to the preparation chamber, the PLC controls the powder addition module to start the screw conveyor. The moisture-proof distributor descends along the track and opens the feeding pipe. The amount of flocculant powder is detected by the micro powder scale. The detected flocculant powder amount data signal is transmitted to the PLC. The PLC compares the powder amount setpoint with the detected value and then outputs a signal to adjust the feeding amount of the screw conveyor. When the set amount of powder is added, the PLC controls the screw conveyor to stop, and at the same time, the moisture-proof distributor rises along the track to close the feeding pipe. S4. While adding flocculant powder to the preparation chamber, the PLC controls the hydraulic circulation pipe circulation pump to start simultaneously. Due to the rotation of the spiral stirrer, a vortex is formed in the central area of ​​the preparation chamber, driving the fluid to flow towards the wall, and the flocculant powder diffuses rapidly. The fluid flowing towards the wall flows out from the high-level circulation pipe under the backflow of the hydraulic circulation pipe, and flows back into the preparation chamber from the low-level circulation pipe via the circulation pump. The flocculant molecules and the undissolved flocculant colloids intercepted by the filter screen re-enter the central stirring flow field under the action of the return water flow in the low-level circulation pipe, and undergo a second thorough stirring. S5. When the stirring time reaches the given value, the PLC controls the solenoid valve of the preparation chamber delivery pipe to open, and the prepared flocculant solution is discharged into the storage silo by gravity or pump for later use. The amount of flocculant solution is detected by an electromagnetic flowmeter, and the detected solution amount data signal is transmitted to the PLC. The PLC compares the given solution amount with the detected value and then outputs a signal to adjust the opening of the solenoid valve. The liquid level in the storage silo is monitored by high-level and low-level level gauges, and the monitored liquid level data signal is transmitted to the PLC. When the liquid level reaches the highest liquid level warning value, the PLC outputs a control signal to close the solenoid valve. When the liquid level reaches the lowest liquid level warning value, the PLC outputs a signal to open the powder addition module and the preparation module to start the preparation of the flocculant solution. S6. When the PLC receives the instruction to start the thickener, the PLC controls the solenoid valve of the material storage silo conveying pipe to open; the solution volume is detected by an electromagnetic flow meter, and the detected solution volume data signal is transmitted to the PLC. The PLC compares the set value of the solution volume with the detected value, and then outputs a signal to adjust the opening degree of the solenoid valve to control the discharge flow rate of the flocculant solution.

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