Control method of liquid preparation system

Abstract

The invention relates to the technical field of solution preparation, and provides a control method of a solution preparation system, which comprises the following steps: acquiring a solution preparation instruction; starting negative pressure equipment according to the liquid preparation instruction, sucking the raw materials into a hopper through a material sucking pipe, and closing the negative pressure equipment when the material supply amount in the hopper is confirmed to reach a first set target value; opening a discharging valve to enable the raw materials in the hopper to fall into the preparation tank, and closing the discharging valve after discharging is completed; opening the flow valve, supplying water into the preparation tank through the water supply structure, and closing the flow valve when the water supply amount is confirmed to reach a second set target value to complete solution preparation. Automation of the solution preparation process can be achieved, and the solution preparation efficiency and the concentration precision of the solution are effectively improved.

Description

Technical Field

[0001] This application relates to the field of solution preparation technology, and in particular to a control method for a solution preparation system. Background Technology

[0002] In nuclear power plants, boric acid solution is used to regulate reactor reactivity, and the accuracy of its preparation is crucial to operational safety. Currently, nuclear power plants still use manual methods for preparation, namely, manually transporting and adding boric acid feedstock, and then manually injecting water to dissolve it. This method is labor-intensive, inefficient, and relies on experience to control the amount of feedstock and water, resulting in large errors in solution concentration and poor repeatability, making it difficult to meet high precision requirements. Summary of the Invention

[0003] The purpose of this application is to provide a control method for a liquid preparation system, which aims to solve the problems of low efficiency and poor concentration ratio accuracy in traditional manual liquid preparation operations.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: This application provides a control method for a liquid preparation system. The liquid preparation system includes a preparation tank, a feeding device, and a water supply device. The feeding device includes a hopper, a discharge valve, a suction pipe, and a negative pressure device. The hopper is connected to the preparation tank, the discharge valve is located between the hopper and the preparation tank, and the negative pressure device is connected to the suction pipe via the hopper. The water supply device includes a water supply structure and a flow valve. The water supply structure is connected to the preparation tank, and the flow valve is located in the water supply structure. The control method includes: Obtain the solution preparation instruction; According to the liquid preparation instruction, the negative pressure device is turned on, and the raw material is sucked into the hopper through the suction pipe. When it is confirmed that the amount of material supplied in the hopper has reached the first set target value, the negative pressure device is turned off. Open the discharge valve to allow the raw materials in the hopper to fall into the preparation tank. After confirming that the discharge is complete, close the discharge valve. Open the flow valve and supply water to the preparation tank through the water supply structure. When the water supply reaches the second set target value, close the flow valve to complete the solution preparation.

[0005] In some embodiments, the feeding device includes a filter disposed between the negative pressure device and the hopper, the filter being connected to an air source via a backflush pipeline, and the backflush pipeline being equipped with a backflush valve; after the step of confirming that the feeding is complete and before the step of closing the feeding valve, the device further includes: Open the backflush valve and use the airflow provided by the air source to backflush the filter and the hopper through the backflush pipeline. After confirming that the backflush is complete, close the backflush valve.

[0006] In some embodiments, the step of confirming that backflushing is complete includes: When the backflushing operation reaches the preset number of backflushing operations or the cumulative backflushing time, confirm that the backflushing is complete.

[0007] In some embodiments, after confirming that the amount of material supplied in the hopper has reached a first preset target value and before turning off the negative pressure device, the method further includes: Control the negative pressure device to perform a preset suction time.

[0008] In some embodiments, the water supply structure includes a spray head assembly and a spray gun, the spray head assembly being disposed inside the preparation tank; the step of opening the flow valve and supplying water to the preparation tank through the water supply structure includes: Obtain the water injection mode command; If the water injection mode command is automatic water injection mode, then the flow valve is opened and water is automatically sprayed into the preparation tank through the spray head assembly; If the water injection mode command is manual water injection mode, then water is manually sprayed into the preparation tank through the spray gun.

[0009] In some embodiments, the water supply device includes a flow meter disposed in the water supply structure; the step of confirming that the water supply volume has reached a second preset target value includes: Water is supplied to the preparation tank through the water supply structure to dissolve the raw materials; The flow meter is used to obtain the current water supply in real time, and the current water supply is compared with the second set target value; If the current water supply does not reach the second set target value, water will continue to be added to the preparation tank through the water supply structure until the current water supply reaches the second set target value.

[0010] In some embodiments, the feeding device includes a sensor disposed on the hopper; the step of confirming that the amount of material fed into the hopper has reached a first preset target value includes: The sensor is used to detect the amount of material fed into the hopper in real time, and the detected value is compared with the first set target value. If the detected value does not reach the first set target value, the material is continued to be sucked through the suction tube until the detected value reaches the first set target value.

[0011] In some embodiments, the step of confirming that the unloading is complete includes: It is achieved based on at least one of the following methods: time control, weight change, and flow state detection.

[0012] In some embodiments, the preparation tank is provided with a dust cover, the hopper is connected to the dust cover, the dust cover has an openable and closable opening, and a valve plate is provided at the opening; the feeding device includes a filter, the filter is connected to the hopper, the negative pressure device is connected to the filter via a suction pipe and to the dust cover via an exhaust pipe; the control method further includes: Before turning on the negative pressure device, open the valve plate; When it is confirmed that the amount of material supplied in the hopper has reached the first set target value, the negative pressure device is turned off and the valve plate is closed.

[0013] In some embodiments, the control method further includes: If an abnormal state is detected during the solution preparation process, an alarm signal is generated, the solution preparation system is shut down, and an alarm message is sent to the user.

[0014] The beneficial effects of the control method for the liquid preparation system provided in this application are as follows: Compared with the prior art, this application realizes full automation from material suction and feeding to water supply, solves the problems of low efficiency and poor accuracy of traditional manual liquid preparation, and significantly improves the efficiency of liquid preparation and the accuracy of concentration control. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the liquid preparation system provided in the embodiments of this application; Figure 2 This is a partial structural schematic diagram of the liquid preparation system provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the suction tube provided in an embodiment of this application; Figure 4 This is a cross-sectional view of the suction tube provided in an embodiment of this application; Figure 5 This is a schematic diagram of the connecting rod provided in an embodiment of this application; Figure 6 for Figure 1 Enlarged view of a portion at point A; Figure 7 This is a schematic diagram of the structure of the water supply device provided in the embodiments of this application; Figure 8 This is a schematic diagram of the structure of the spray head assembly provided in the embodiments of this application; Figure 9 This is a schematic diagram showing the distribution of spray holes provided in an embodiment of this application; Figure 10 This is a partial structural schematic diagram of the liquid preparation system provided in the embodiments of this application; Figure 11 This is a partial exploded view of the liquid preparation system provided in the embodiments of this application; Figure 12 This is a schematic diagram of the structure of the filter cartridge provided in an embodiment of this application; Figure 13 This is a schematic diagram showing the relative positions of the spray head assembly and the filter cartridge provided in the embodiments of this application; Figure 14 A schematic flowchart illustrating the control method for the liquid preparation system provided in this application embodiment; Figure 15 This is a schematic flowchart of the water supply method for the liquid preparation system provided in the embodiments of this application.

[0017] The following are the labeling elements in the figure: 1. Preparation tank; 101. Tank body; 102. Feeding pipe; 103. Filter cartridge; 104. Dust cover; 105. Opening; 106. Valve plate; 107. Discharge pipe; 108. Inlet; 109. Filter hole; 2. Feeding device; 201. Hopper; 202. Discharge valve; 203. Suction pipe; 204. Negative pressure device; 205. Filter; 206. Backflush connector; 207. Backflush piping; 208. Backflush valve; 209. Suction connector; 210. Suction piping; 211. Suction end; 212. Suction port; 213. Anti-suction net; 214. Gas flow channel; 215. Connecting rod; 216. First end; 217. Second end; 218. Main body; 219. Gasket; 220. Reinforcing ring; 221. Agitator; 222. Clamps; 223. Material bucket; 224. Storage box; 225. Dust cover; 226. Collection bucket; 227. Exhaust pipe; 228. Feed pipe; 3. Water supply device; 301. Water supply structure; 302. Flow valve; 303. Flow meter; 304. Water supply pipeline; 305. Automatic filling pipeline; 306. Manual filling pipeline; 307. Spray head assembly; 308. Three-way valve; 309. First valve port; 310. Second valve port; 311. Third valve port; 312. Spray head; 313. Pipe seat; 314. Main pipe; 315. First ring pipe; 316. Second ring pipe; 317. Branch pipe; 318. Connector; 319. First spray nozzle; 320. Second spray nozzle; 4. Controller. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0019] In the description of the embodiments of this application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] In the embodiments of this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0022] In the operation of nuclear power plants, boric acid solution is widely used in reactor coolant systems. By adjusting the boric acid concentration, reactivity is controlled, power regulation and reactor shutdown compensation are achieved, making it one of the important means to ensure the safe and stable operation of nuclear reactors. Therefore, the accuracy of boric acid solution preparation directly affects the control accuracy and operational safety of the reactor. Currently, nuclear power plants still use manual methods to prepare boric acid solutions, that is, manually transporting and adding boric acid raw materials, and then manually adding water to dissolve it. This method is labor-intensive, inefficient, and relies on experience to control the raw materials and water volume, resulting in large errors in solution concentration and poor repeatability, making it difficult to meet high precision requirements. To address this, this application combines negative pressure automatic feeding technology with closed-loop precise water supply control, and integrates automated control logic that links sensor detection and controller linkage to construct an intelligent solution preparation system that integrates raw material transportation, quantitative addition, and precise water distribution. Specifically, negative pressure suction and weighing feedback enable automatic and precise feeding of raw materials, flow metering and dynamic adjustment enable high-precision liquid proportioning, and finally, the controller coordinates all the actuators to complete the automation and closed-loop control of the entire solution preparation process, thereby solving the problems of low efficiency and large error in the preparation of boric acid solution in nuclear power plants.

[0023] In some embodiments, refer to Figure 1 and Figure 2 As shown in the figure, this application provides a liquid preparation system, including: a preparation tank 1, a feeding device 2, a water supply device 3, and a controller 4. The feeding device 2 includes a hopper 201, a discharge valve 202, a suction pipe 203, a negative pressure device 204, and a sensor (not shown in the figure). The hopper 201 is connected to the preparation tank 1, the discharge valve 202 is located between the hopper 201 and the preparation tank 1, the suction pipe 203 is connected to the hopper 201, the negative pressure device 204 is connected to the hopper 201, and the sensor is used to detect the feeding amount. The water supply device 3 includes a water supply structure 301, a flow valve 302, and a flow meter 303. The water supply structure 301 is connected to the preparation tank 1, and the flow valve 302 and the flow meter 303 are located within the water supply structure 301. The controller 4 is electrically connected to the discharge valve 202, the negative pressure device 204, the sensor, the flow valve 302, and the flow meter 303.

[0024] The preparation tank 1, serving as a container for solution mixing and dissolution, is connected to the hopper 201 and the water supply structure 301, respectively. It receives raw materials (powdered, such as boric acid) from the feeding device 2 and water from the water supply device 3 to complete the preparation of the final solution. The preparation tank 1 has good sealing and corrosion resistance, especially for boric acid raw materials.

[0025] The feeding device 2 is used to achieve automatic and precise addition of powdered raw materials. Specifically, the hopper 201 is used to temporarily store the sucked-in raw materials. The hopper 201 can be connected to the top of the preparation tank 1 through the discharge pipe 228 for easy feeding under gravity. The discharge valve 202 is located between the hopper 201 and the preparation tank 1, for example, it can be specifically located at the discharge port of the hopper 201. It is used to control whether the raw materials in the hopper 201 fall into the preparation tank 1, so as to realize the feeding start and stop function. The discharge valve 202 can be a butterfly valve or other valve with on and off functions. The suction pipe 203 can be a long and thin pipe used to connect to an external raw material bag to introduce the powdered raw materials in the bag into the hopper 201 by pneumatic conveying. The negative pressure device 204 is used to provide a negative pressure power source to drive air flow, thereby sucking the powdered raw materials into the hopper 201 through the suction pipe 203. The negative pressure device 204 can be a vacuum pump or a Roots blower, etc. The sensor can be installed on the hopper 201 to detect the amount of material fed into the hopper 201 in real time. The sensor can be a weighing sensor, a level sensor, a powder flow meter or other components to achieve accurate measurement.

[0026] The water supply device 3 is responsible for quantitatively adding liquid to ensure accurate water volume. Specifically, the water supply structure 301 connects the water source (deionized water or demineralized water) to the preparation tank 1. The flow valve 302 is used to regulate the water flow and its magnitude, and can be an electric regulating valve, solenoid valve, etc. The flow meter 303 is used to measure the water supply in real time, and can be an electromagnetic flow meter, mass flow meter, etc.

[0027] Controller 4 is the control unit of the entire system and can be a PLC controller, industrial computer, etc. Controller 4 is electrically connected to electronic components such as the feed valve 202, negative pressure device 204, sensors, flow valve 302, and flow meter 303 to achieve data acquisition, logical judgment, and execution control. Based on preset formula parameters (such as target concentration and solution volume) and combined with sensor feedback signals, it adjusts the actions of each actuator in a closed loop. In one example, the target concentration can be 7000-7700 ppm with an error ≤5%, meeting nuclear-grade water quality requirements.

[0028] The working principle of the liquid preparation system provided in this application embodiment is described below using boric acid raw material as an example, including the negative pressure feeding stage, the gravity feeding stage, and the quantitative water supply and dissolution stage.

[0029] Negative pressure feeding stage: The initial state of the discharge valve 202 is closed to prevent boric acid powder from entering the preparation tank 1 during the feeding process and affecting the detection of the feeding amount; the negative pressure device 204 is started to form a negative pressure environment in the suction pipe 203 and the hopper 201; the boric acid powder is sucked into the hopper 201 through the suction pipe 203; the sensor continuously monitors the increase in raw material in the hopper 201 (e.g., through a weighing sensor); when the detected value reaches the target value set by the controller 4 (which can be a range value), a feedback signal is issued; after receiving the signal, the controller 4 closes the negative pressure device 204, stops feeding, and completes precise feeding.

[0030] Gravity feeding stage: After confirming that the feeding is completed, the controller 4 opens the feeding valve 202; the boric acid in the hopper 201 falls into the preparation tank 1 under the action of gravity. After confirming that the feeding is completed by means of delay control, weighing zeroing, feeding time threshold or detector (such as camera), the feeding valve 202 is closed to complete the feeding of boric acid raw materials.

[0031] Quantitative water supply and dissolution stage: After the boric acid raw material is added, the flow valve 302 is opened, and the boric acid is flushed and dissolved through the water supply structure 301; the flow meter 303 detects the water supply in real time and transmits the detection data to the controller 4; the controller 4 compares the detected water supply with the set target value and calculates the deviation; the opening of the flow valve 302 is dynamically adjusted (such as PID adjustment) according to the deviation to achieve precise flow control; when the water supply reaches the set target value (which can be a range value), the controller 4 closes the flow valve 302 and stops the water supply, finally obtaining a boric acid solution that meets the target concentration requirements.

[0032] Therefore, the liquid preparation system provided in this application embodiment, through the structural design of negative pressure automatic feeding, gravity feeding and flow closed-loop water supply, combined with the working principle of sensor detection and controller intelligent control, realizes the automation, precision and safety of the liquid preparation process, reduces human intervention, reduces human error, and significantly improves liquid preparation efficiency and concentration control accuracy.

[0033] In some embodiments, refer to Figure 1 and Figure 2 As shown, the feeding device 2 includes a filter 205. The negative pressure device 204 is connected to the hopper 201 through the filter 205. The filter 205 is provided with a backflush connector 206. The backflush connector 206 is connected to the air source through the backflush pipeline 207. The backflush pipeline 207 is provided with a backflush valve 208. The backflush valve 208 is electrically connected to the controller 4.

[0034] Filter 205 is installed on hopper 201 and is connected to the internal space of hopper 201 to facilitate gas flow. A suction connector 209 can be installed on the top of filter 205 for connection to negative pressure equipment 204 via suction pipe 210. Filter 205 serves as a gas-solid separation protector, preventing raw material particles from entering negative pressure equipment 204 with the airflow and causing blockage or damage, thus ensuring stable system operation. Furthermore, by connecting the backflush connector 206 on the top of filter 205 to an air source (such as compressed air) via backflush pipe 207, a small amount of powdery raw material remaining inside filter 205 and hopper 201 can be effectively removed using air. Suction connector 209 and backflush connector 206 can be quick-change connectors for rapid assembly.

[0035] The backflush valve 208 can be a solenoid valve, controlled by the controller 4, used to control the opening and closing of the backflush pipeline 207. Specifically, when the controller 4 detects that the feeding process is complete, it can start the backflush program, open the backflush valve 208, and compressed air enters the filter 205 through the backflush pipeline 207, blowing the small amount of raw material remaining in the filter 205 and hopper 201 into the preparation tank 1. When the backflush operation reaches the set number of backflushes (e.g., 2-4 times, each backflush lasting 2-4 seconds) or the accumulated backflush time, the backflush valve 208 is closed to stop the backflush, and then the feeding valve 202 is closed to prepare for the subsequent water supply and dissolution step. It can be understood that when the negative pressure device 204 is feeding, the airflow direction in the filter 205 is from bottom to top, and during backflush, the airflow direction is from top to bottom.

[0036] Therefore, by performing a backflushing operation on the filter 205, this embodiment of the application can solve the clogging problem caused by raw material residue while ensuring the target concentration range of the solution, thereby reducing maintenance frequency and improving system reliability.

[0037] When material suction is required, the suction tube is inserted into the raw material bag. Under the negative pressure provided by the negative pressure equipment, lightweight raw material bags (such as plastic woven bags) are easily sucked directly to the suction port, causing blockage of the suction port, interruption of the airflow channel, and affecting suction efficiency. In severe cases, it can even cause the equipment to stop due to abnormal negative pressure, requiring manual intervention for cleaning, which not only reduces production efficiency but also increases maintenance costs. To solve the above technical problems, this application provides a novel suction tube structure. By setting an anti-suction net with a gas flow channel at the end of the suction tube, the function of "air passage and bag blocking" can be achieved, avoiding blockage caused by the bag being sucked in, thereby effectively improving the continuity and stability of the suction process, reducing the number of equipment downtimes, and improving suction efficiency.

[0038] In some embodiments, refer to Figure 3 and Figure 4As shown, the suction pipe 203 has a suction end 211 that is away from the hopper 201, and the suction end 211 is provided with a suction port 212; the feeding device 2 includes an anti-suction net 213, which is sleeved on the outside of the suction end 211 and covers the suction port 212, and the anti-suction net 213 has a gas flow channel 214, which is connected to the suction port 212.

[0039] Under the negative pressure provided by the negative pressure device 204, the suction pipe 203 drives the raw material to be conveyed. The suction port 212 at the end of the suction pipe 203 is the inlet for the raw material to enter the pipeline. The suction pipe 203 can be made of a material with a certain rigidity, such as stainless steel or aluminum alloy.

[0040] An anti-sucking net 213 is fitted over the suction end 211 of the suction tube 203 and covers the suction port 212, forming an isolation barrier. The anti-sucking net 213 has gas flow channels 214, which allow gas and small materials to pass through while preventing larger objects (such as the body of a raw material bag) from directly contacting the suction port 212. The anti-sucking net 213 can be made of rigid metal mesh, plastic mesh, etc., possessing sufficient structural strength to resist negative pressure suction without deformation.

[0041] When the negative pressure device 204 is activated, a negative pressure environment is created inside the suction pipe 203, and external air carrying the raw material enters the pipe from the suction port 212. Specifically, under the action of negative pressure, the raw material in the bag is carried by the airflow through the gas channel 214 of the anti-suction net 213 into the suction port 212, and thus into the suction pipe 203, while the bag body is blocked outside by the anti-suction net 213. It can be understood that the anti-suction net 213, as an isolation barrier, can effectively isolate the direct contact between the raw material bag and the suction port 212, preventing the bag body from being directly sucked into the suction port 212. Optionally, the size of the gas channel 214 can be designed according to actual needs to allow air and raw materials that meet the particle size requirements to pass through, playing a coarse filtration role, preventing large impurities from entering the pipe, and protecting downstream equipment.

[0042] Therefore, by setting an anti-suction net 213 with a gas flow channel 214 at the end of the suction pipe 203, this embodiment of the application can effectively isolate the raw material bag from the suction port 212 without affecting the normal suction of gas and raw materials, and realize the function of "air passage and bag blocking". This prevents the soft raw material bag from directly adhering to or being sucked into the suction port 212 and causing blockage, which is conducive to achieving efficient and stable continuous suction operation, and has the characteristics of simple structure and reliability.

[0043] In some embodiments, refer to Figures 3 to 5As shown, the anti-suction net 213 includes a plurality of connecting rods 215 arranged circumferentially around the suction pipe 203, with gas flow channels 214 between adjacent connecting rods 215. Each connecting rod 215 includes a first end 216, a second end 217, and a main body 218. The first end 216 of each connecting rod 215 is connected to the suction end 211, the second ends 217 of each connecting rod 215 are interconnected, and the main body 218 is located between the first end 216 and the second end 217. At least one connecting rod 215's main body 218 is arranged outwardly in a direction away from the central axis of the suction pipe 203. The central axis of the suction pipe 203 is as follows: Figure 4 As shown by the dashed line.

[0044] The specific number of connecting rods 215 in this application is not particularly limited and can be adjusted according to actual needs. For example, the number of connecting rods 215 can be 12. The connecting rods 215 can be made of materials with a certain degree of rigidity, such as stainless steel or aluminum alloy. The first end 216 of each connecting rod 215 is fixed to the suction end 211, and the second ends 217 are connected to each other, thus forming a stable cage-like frame structure. This improves the overall structural rigidity and stability of the anti-suction net 213, making it less prone to deformation under strong negative pressure and ensuring continuous stability during the suction process.

[0045] Furthermore, the multiple connecting rods 215 can be evenly distributed circumferentially, so that the gas flow channels 214 are symmetrically arranged around the suction port 212. The airflow can enter the suction pipe 203 evenly from multiple directions, avoiding the airflow deviation and vortex phenomena caused by traditional single-sided openings or asymmetrical structures. This not only improves the suction efficiency, but also helps to reduce the agglomeration of raw materials during the suction process, achieving more uniform raw material delivery.

[0046] It is understood that the gas flow channel 214 formed between the connecting rods 215 in this embodiment can be a strip-shaped channel, which has a larger cross-sectional area per channel compared to a dense mesh structure. This is more conducive to the passage of large-volume airflow, while reducing the accumulation of fine powder raw materials in the flow channel and avoiding blockage. This connecting rod-type anti-suction mesh structure is easier to observe and clean than a fine mesh filter.

[0047] The connecting rod 215 can be a one-piece molded structure. By extending the main body 218 of the connecting rod 215 outward, the raw material bag can be opened, which significantly increases the space around the suction port 212, effectively preventing the raw material bag from directly contacting the suction port 212. At the same time, it allows more raw material to enter the gas flow channel 214 and be sucked into the suction pipe 203, thereby increasing the suction volume.

[0048] Therefore, by adopting an outwardly expanding arrangement for the main body 218 of the connecting rod 215 in this embodiment, the problem of the raw material bag blocking the suction port 212 is not only effectively solved, but the suction efficiency is also greatly improved.

[0049] In some embodiments, refer to Figures 3 to 5 As shown, the main body 218 arranged outwards has an arc shape.

[0050] This embodiment employs an arc-shaped main body 218, which effectively increases the safe distance between the suction port 212 and the raw material bag, ensuring smooth suction. Furthermore, the arc-shaped design guides airflow more smoothly through the gas channel 214, reducing airflow resistance and turbulence, thereby improving suction efficiency.

[0051] In some embodiments, refer to Figure 4 As shown, the maximum radial distance d1 between the outwardly arranged main body 218 and the suction pipe 203 is 8~10mm.

[0052] If the maximum radial distance is too small, such as less than 8 mm, there is a risk that the raw material bag may be partially sucked in or adhere to the vicinity of the suction port 212 due to the negative pressure, which will lead to poor airflow and reduce suction efficiency. If the maximum radial distance is too large, such as greater than 10 mm, the entire anti-suction net 213 structure will be too large, increasing manufacturing costs. Therefore, in this embodiment, by setting the maximum radial distance d1 to 8~10 mm, it can effectively avoid the blockage problem caused by the raw material bag adhering to the suction port 212, ensuring efficient suction performance, and also facilitates the miniaturization design of the anti-suction net structure, reducing costs.

[0053] In some embodiments, refer to Figures 3 to 5 As shown, the anti-sucking net 213 includes a pad 219, and the second end 217 of each connecting rod 215 is connected to the pad 219.

[0054] The gasket 219 in this embodiment can be made of a material with a certain rigidity, such as stainless steel or aluminum alloy. The gasket 219 can be circular or annular, and the center of the gasket 219 can be located on the central axis of the suction tube 203, which is easy to position and center, and ensures the symmetry and accuracy of the spatial layout of each connecting rod 215.

[0055] The second end 217 of each connecting rod 215 can be fixed to the same gasket 219 by welding, riveting, or injection molding, forming a connection of "multiple rods converging and unified anchoring". This concentrates the originally scattered connection points onto a rigid support (gasket 219), effectively avoiding misalignment and loosening problems that may occur between connecting rods 215 due to independent fixing. As a common connecting base, gasket 219 can strengthen the structure, improve the overall rigidity of the anti-sucking net 213, and improve the connection reliability of each connecting rod 215, thereby enhancing the structural stability of the anti-sucking net 213.

[0056] In some embodiments, refer to Figure 4 As shown, the planes where the gasket 219 and the suction port 212 are located are parallel to each other, and the distance d2 between the side of the gasket 219 facing away from the suction port 212 and the suction port 212 is 2~5mm.

[0057] In this embodiment of the application, by controlling the distance between the gasket 219 and the suction port 212 within the range of 2~5mm, it is possible to ensure that the anti-suction net 213 effectively prevents the raw material bag from being sucked in, while maximizing the reduction of residual raw material in the raw material bag, ensuring that the entire bag of raw material can be sucked in as much as possible, and increasing the suction volume.

[0058] In some embodiments, refer to Figures 3 to 5 As shown, the anti-sucking net 213 includes a reinforcing ring 220, which is sleeved on the outside of the first end 216 of each connecting rod 215.

[0059] The reinforcing ring 220 in this embodiment can be made of a material with a certain rigidity, such as stainless steel or aluminum alloy. As a ring-shaped structural component, the reinforcing ring 220 surrounds the first end 216 of all connecting rods 215 to form a reinforced frame, which can effectively improve the overall rigidity of the entire anti-absorption net 213 structure, enhance its resistance to deformation, and improve the installation stability of the overall structure.

[0060] In some embodiments, the first end 216 of each connecting rod 215 is welded to the suction end 211 and the reinforcing ring 220, respectively.

[0061] In this embodiment of the application, the first end 216 of each connecting rod 215 is fixedly connected to the suction end 211 and the reinforcing ring 220 by welding. Specifically, during assembly, the reinforcing ring 220 can be welded to the first end 216 of each connecting rod 215 to form an integral anti-suction net assembly. Then, this pre-assembled anti-suction net assembly is fitted onto the suction end 211 of the suction pipe 203 and welded again to ensure the stability of the entire structure. This double welding method not only increases the number of connection points but also enhances the rigidity and strength of the overall structure through multi-directional welding, improving the connection stability and reliability between the anti-suction net 213 and the suction pipe 203.

[0062] In other embodiments, the first end 216 of each link 215 is detachably connected to the suction end 211 and the reinforcing ring 220, and the reinforcing ring 220 is used to press the first end 216 of each link 215 onto the suction end 211.

[0063] For example, a first threaded structure can be provided on the inner wall of the first end 216 of each connecting rod 215 adjacent to the suction end 211, and a second threaded structure can be provided on the outer wall of the suction end 211. Each first threaded structure is threadedly connected to the second threaded structure. Then, by sleeved on the first end 216 of each connecting rod 215 with a reinforcing ring 220, the first end 216 of each connecting rod 215 is further pressed onto the suction end 211 of the suction pipe 203, thereby fixing the anti-suction net 213 to the suction pipe 203. For example, a limiting protrusion can be provided on the inner wall of the first end 216 of each connecting rod 215 adjacent to the suction end 211, and a corresponding limiting hole can be provided on the suction end 211 of the suction pipe 203. Each limiting protrusion passes through the corresponding limiting hole. Then, a reinforcing ring 220 is sleeved on the first end 216 of each connecting rod 215 to further press the first end 216 of each connecting rod 215 onto the suction end 211, thereby fixing the anti-suction net 213 and the suction pipe 203. In addition, in order to improve the connection stability of the reinforcing ring 220, it can be connected to the first end 216 of each connecting rod 215 by a threaded connection, that is, the reinforcing ring 220 is threadedly pressed onto the first end 216 of each connecting rod 215.

[0064] The embodiments of this application utilize a detachable connection method to enable quick assembly and disassembly of the anti-suction net 213, facilitating the cleaning, inspection, or replacement of the suction pipe 203 and the anti-suction net 213.

[0065] As an example, the suction pipe 203 is made of stainless steel; the anti-sucking net 213 includes multiple connecting rods 215, reinforcing rings 220, and gaskets 219, all of which can be made of stainless steel. The connecting rods 215 and reinforcing rings 220 have a diameter of 2 mm, and the gaskets 219 have a thickness of 1.5 mm and a diameter of 20 mm.

[0066] During assembly, the reinforcing ring 220 can be welded to the first end 216 of each connecting rod 215, and the second end 217 of each connecting rod 215 can be welded to the gasket 219 to form an anti-suction net 213. The anti-suction net 213 is then installed as a whole to the suction end 211 of the suction pipe 203, and the first end 216 of each connecting rod 215 is welded to the suction end 211 to achieve a fixed assembly of the anti-suction net 213 and the suction pipe 203.

[0067] In some embodiments, refer to Figure 6 As shown, the feeding device 2 includes a stirrer 221, which is used to stir the raw materials sucked by the suction pipe 203.

[0068] Since the raw materials in the raw material bag are clumped, this embodiment of the application uses a stirrer 221 to stir and break the clumped raw materials into powder so as to facilitate material intake.

[0069] For example, if the boric acid material in the raw material bag is clumped, clamp the raw material bag inside the material bucket 223 using clamp 222, and first use an electric agitator 221 to agitate and break the boric acid material into powder. After crushing, place the agitator 221 on the storage box 224. Then, insert the suction pipe 203 into the raw material bag and cover it with a dust cover 225 to prevent the raw material from escaping during suction and to avoid polluting the external environment. In addition, the suction pipe 203 can be fixed to the wall with a U-shaped pipe clamp.

[0070] The following continues to describe the relevant structure of the water supply device 3 provided in the embodiments of this application.

[0071] In some embodiments, refer to Figure 7 As shown, the water supply structure 301 includes a water supply pipeline 304, an automatic filling pipeline 305, a manual filling pipeline 306, a spray head assembly 307, a spray gun (not shown in the figure), and a three-way valve 308. One end of the water supply pipeline 304 is connected to a water source via a booster pump (not shown in the figure), and the booster pump is electrically connected to the controller 4. The automatic filling pipeline 305 is equipped with a flow valve 302 and a flow meter 303. One end of the automatic filling pipeline 305 is connected to the spray head assembly 307, which is located inside the preparation tank 1. One end of the manual filling pipeline 306 is connected to the spray gun, which is used to inject water into the preparation tank 1. The three-way valve 308 is connected to the other end of the water supply pipeline 304, the other end of the automatic filling pipeline 305, and the other end of the manual filling pipeline 306, respectively, and is used to switch the water injection mode, which includes an automatic water injection mode and a manual water injection mode.

[0072] Water supply pipeline 304 is connected to a water source via a booster pump. The booster pump pumps water into water supply pipeline 304 to provide a stable water pressure, ensuring sufficient water flow pressure is maintained in both automatic and manual water injection modes to guarantee the spraying effect.

[0073] The three-way valve 308 includes three valve ports: a first valve port 309, a second valve port 310, and a third valve port 311. The first valve port 309 is connected to the other end of the water supply pipeline 304, the second valve port 310 is connected to the other end of the automatic filling pipeline 305, and the third valve port 311 is connected to the other end of the manual filling pipeline 306. The three-way valve 308 is configured such that in the automatic water filling mode, the first valve port 309 is connected to the second valve port 310, and in the manual water filling mode, the first valve port 309 is connected to the third valve port 311. That is, the three-way valve 308 can achieve two connection states. Specifically, when switching to automatic water filling mode, the first valve port 309 is connected to the second valve port 310, connecting the water supply pipeline 304 to the automatic filling pipeline 305; when switching to manual water filling mode, the first valve port 309 is connected to the third valve port 311, connecting the water supply pipeline 304 to the manual filling pipeline 306. The specific type of the three-way valve 308 in this embodiment is not particularly limited; for example, it can be an electric three-way valve, a pneumatic three-way valve, or a manual three-way valve. That is, the three-way valve 308 can be automatically controlled by the controller 4 or manually controlled, and can be designed according to actual needs. This application achieves mode switching through a single valve, resulting in a simple structure, fewer potential failure points, and rapid response.

[0074] The automatic filling line 305, in conjunction with the sprinkler head assembly 307, is used for automated water spraying during normal operation. The manual filling line 306, in conjunction with the spray gun, serves as a backup water supply method for emergency or maintenance situations. It can be understood that the automatic filling line 305 and the manual filling line 306 are respectively connected to the water supply line 304 via a three-way valve 308, integrating the automatic sprinkler and emergency spray gun into the same water supply line, achieving dual-use from a single water source.

[0075] The water supply pipeline 304, automatic filling pipeline 305, and manual filling pipeline 306 of this application can be metal pipes (such as stainless steel pipes) or plastic flexible hoses. As an example, the above pipelines are made of stainless steel pipes, and the pipe body is lined with polytetrafluoroethylene, which is resistant to boric acid corrosion and has an operating temperature range of -40℃ to 200℃.

[0076] The working principle of the water supply structure 301 provided in the embodiments of this application is described below, mainly including automatic water injection mode and manual water injection mode.

[0077] After the controller 4 is powered on, it can receive the operating mode command input by the operator and determine whether the current command is automatic water injection mode or manual water injection mode. If it is automatic water injection mode, the controller 4 automatically or prompts the operator to switch the three-way valve 308 to the state where the first valve port 309 and the second valve port 310 are connected, connecting the water supply pipeline 304 and the automatic filling pipeline 305. The controller 4 starts the booster pump, and the water source passes through the booster pump, water supply pipeline 304, three-way valve 308, and automatic filling pipeline 305 to the sprinkler head assembly 307. Water is automatically sprayed through the sprinkler head assembly 307. The flow rate value is detected by the flow meter 303 and fed back to the controller 4. The controller 4 compares it with the set target value and adjusts the opening of the flow valve 302 based on the deviation until the target water volume is reached. Then, the controller 4 closes the flow valve 302 to achieve precise water injection.

[0078] When a manual operation command (such as maintenance) is received, the system switches to manual water injection mode. The operator connects the spray gun to the manual injection line 306, or the spray gun can be pre-assembled with the manual injection line 306. Then, the three-way valve 308 is switched to connect the first valve port 309 and the third valve port 311, connecting the water supply line 304 to the manual injection line 306. Water flows through the booster pump, water supply line 304, three-way valve 308, and manual injection line 306 to the spray gun. The operator manually sprays water using the spray gun, and the water volume can be controlled by the spray gun. For example, the spray gun can be equipped with a sensor and display to detect and display the water volume in real time until the target water volume is reached, thus achieving precise manual water spraying.

[0079] Therefore, the water supply structure 301 provided in this application embodiment realizes the coordinated operation of automatic spraying and manual spray gun in two modes through the fluid switching function of the three-way valve 308. During normal operation, automatic filling achieves continuous and precise water injection; under special conditions such as maintenance, it quickly switches to manual water injection mode, using the spray gun for emergency operation, ensuring uninterrupted solution preparation, improving the continuity of solution preparation, reducing equipment downtime, and solving the problems of single water injection mode and insufficient emergency response capability in traditional boric acid solution preparation systems.

[0080] In some embodiments, refer to Figure 7 As shown, the flow valve 302, flow meter 303, and spray head assembly 307 are detachably connected to the automatic filling line 305.

[0081] Connection methods can include clamp connection, quick-connect coupling connection, etc. When the flow valve 302 is blocked, the flow meter 303 is inaccurate, or the spray head assembly 307 is damaged, the faulty part can be quickly removed for replacement or repair, which can effectively shorten the replacement and maintenance time and thus meet the rapid maintenance needs of nuclear power plants.

[0082] In some embodiments, refer to Figure 7 and Figure 8 As shown, the spray head assembly 307 includes a plurality of spray heads 312 spaced apart in a ring, and the spray heads 312 are connected to the automatic filling line 305.

[0083] Multiple spray heads 312 can be arranged at equal intervals along the circumference, and each spray head 312 is connected to an automatic water filling pipeline 305. In automatic water filling mode, water flows through the flow valve 302 in the automatic water filling pipeline 305 and then enters each spray head 312 to achieve a wide-area spraying effect. The specific number of spray heads 312 is not particularly limited in this application; for example, it can be 3, 4, 5, 6, etc. When there are 3 spray heads 312, the central angle between adjacent spray heads 312 is 120°; when there are 6 spray heads 312, the central angle between adjacent spray heads 312 is 60°.

[0084] This embodiment of the application expands the spray coverage during the automatic filling process by using a multi-point spraying ring method, avoiding the small coverage caused by traditional single-point spraying. It achieves uniform distribution of water flow in the preparation tank 1, thereby effectively enhancing the dispersion and dissolution of raw materials, preventing accumulation and clumping, and improving dissolution efficiency and solution uniformity.

[0085] In some embodiments, refer to Figure 7 As shown, the spray head assembly 307 includes a pipe seat 313, on which a spray head 312 is provided, and the pipe seat 313 is used to connect the automatic filling pipeline 305 and the spray head 312.

[0086] The pipe seat 313 can be made of a rigid material (such as stainless steel) to improve structural stability. Multiple spray heads 312 are evenly arranged around the pipe seat 313 and integrated with the pipe seat 313 to form a modular spray head assembly 307, improving the overall structural compactness. When the spray head assembly 307 is clogged or needs cleaning, the entire assembly can be quickly removed and replaced with a spare spray head assembly 307, making it convenient to use. Furthermore, the pipe seat 313 has a flow channel inside to connect the automatic filling pipeline 305 and the spray heads 312, facilitating the delivery of water from the automatic filling pipeline 305 to the spray heads 312.

[0087] In some embodiments, refer to Figure 8As shown, the pipe seat 313 includes a main pipe 314, a first ring pipe 315, a second ring pipe 316, multiple branch pipes 317, and multiple connectors 318. One end of the main pipe 314 is connected to the automatic filling pipeline 305, and the other end of the main pipe 314 is connected to the first ring pipe 315. The first ring pipe 315 and the second ring pipe 316 are arranged vertically. Multiple branch pipes 317 are arranged in a ring and connected between the first ring pipe 315 and the second ring pipe 316. Multiple connectors 318 are arranged in a ring and connected to the second ring pipe 316. The connectors 318 are used to connect to the spray head 312, and the branch pipes 317, connectors 318, and spray heads 312 are arranged in a one-to-one correspondence.

[0088] The two ends of the main pipe 314 are connected to the automatic filling pipeline 305 and the first ring pipe 315 respectively, and are used to introduce water pressurized by the booster pump in the automatic filling pipeline 305 into the first ring pipe 315.

[0089] The first ring pipe 315 and the second ring pipe 316 are arranged at an interval, and can be the same size and concentrically. The first ring pipe 315 is located above and receives pressurized water from the main pipe 314; the second ring pipe 316 is located below and is responsible for supplying pressurized water to each spray head 312.

[0090] Multiple branch pipes 317 are evenly distributed vertically between the first ring pipe 315 and the second ring pipe 316, forming a three-dimensional frame to support the spray head 312 and guide the water flow from the upper first ring pipe 315 to the lower second ring pipe 316, ensuring that the water flow is evenly distributed.

[0091] Multiple connectors 318 are evenly distributed on the second ring pipe 316, with each connector 318 corresponding to a branch pipe 317 and a spray head 312. This ensures that the water flow can be directly and evenly distributed to each spray head 312, achieving a uniform spraying effect. Furthermore, the spray head 312 and connector 318 can be connected in a detachable manner (such as snap-fit ​​or screw-fit), allowing for quick replacement if a spray head 312 becomes clogged or damaged.

[0092] Understandably, the water flow is initially dispersed through the branch pipe 317 between the first ring pipe 315 and the second ring pipe 316, and then precisely distributed to each spray head 312 via the connector 318 on the second ring pipe 316. This ensures that all spray heads 312 receive a relatively stable water supply. Furthermore, the evenly distributed spray heads 312 on the second ring pipe 316 effectively increase the spray coverage, thereby preventing material accumulation and promoting rapid dissolution.

[0093] Therefore, the embodiment of this application adopts the above-mentioned pipe seat 313 structure to form a multi-level, multi-path fluid distribution pipeline, which ensures the water supply balance between each spray head 312, thereby helping to enhance the dissolution efficiency in the solution preparation process and reduce the possibility of raw material accumulation.

[0094] In some embodiments, refer to Figure 9 and Figure 13 As shown, the spray head 312 has multiple spray holes, including a first spray hole 319 and second spray holes 320. The central axis of the first spray hole 319 coincides with the central axis of the spray head 312. The multiple second spray holes 320 are arranged in a ring around the first spray hole 319, and the central axis of each second spray hole 320 is inclined outward relative to the central axis of the spray head 312. Optionally, the inclination angle α can be 15°~60°.

[0095] The first spray hole 319 is located in the middle of the spray head 312, and its axis coincides with the central axis of the spray head 312. It is used to provide a vertically downward water flow to directly scour the bottom area of ​​the filter cartridge 103. A plurality of second spray holes 320 are arranged in a ring around the first spray hole 319, and the second spray holes 320 are tilted outward at a certain angle, which can make the sprayed water flow dispersed. When the multiple tilted second spray holes 320 work at the same time, the water flow disperses in space and can roughly form an overall conical spray profile, thereby significantly expanding the spray coverage area and especially enhancing the wetting and scouring effect on the side area of ​​the filter cartridge 103.

[0096] Therefore, by combining the first spray hole 319 with the second spray hole 320, this embodiment of the application can form a multi-layered and multi-directional water flow impact, preventing the raw materials from accumulating and clumping on the filter cartridge 103, avoiding clogging of the filter cartridge 103, effectively promoting solid-liquid mixing, and thus improving the dissolution efficiency of the raw materials.

[0097] In some embodiments, refer to Figure 9 As shown, the second spray holes 320 can be arranged in multiple concentric circles, with the same number of second spray holes 320 on each concentric circle, and the second spray holes 320 on adjacent concentric circles corresponding one-to-one. This design ensures the uniform distribution of the second spray holes 320 on each concentric circle, thereby achieving relatively uniform spray coverage.

[0098] The number of spray holes in this embodiment can be designed according to actual needs to adjust the distribution density of the spray holes. For example, the number of spray holes can be 2000.

[0099] In some embodiments, the water pressure of the spray head 312 is 0.6~0.8MPa.

[0100] By setting the water pressure of the spray head 312 to 0.6~0.8MPa, the kinetic energy of the water flow can be guaranteed, the spraying effect in the automatic water injection mode can be improved, and the sprayed water flow can effectively disperse the raw materials on the filter cartridge 103 in the preparation tank 1 below, prevent accumulation, promote the dispersion and dissolution of raw materials, and improve the liquid preparation efficiency and solution uniformity.

[0101] In some embodiments, the working pressure of the spray gun is 8 to 8.5 bar.

[0102] By setting the working pressure of the spray gun to 8~8.5 bar, the kinetic energy of the water flow can be guaranteed, the spraying effect in manual water injection mode can be improved, and the sprayed water flow can effectively disperse the raw materials on the filter cartridge 103 inside the preparation tank 1, prevent accumulation, promote the dispersion and dissolution of raw materials, and improve the solution preparation efficiency and solution uniformity.

[0103] In some embodiments, refer to Figures 10 to 13 As shown, the preparation tank 1 includes a tank body 101 and a receiving pipe 102. The receiving pipe 102 is located on the tank body 101 and connected to the hopper 201. A filter cartridge 103 for receiving raw materials is provided inside the receiving pipe 102. The spray head assembly 307 is located inside the filter cartridge 103 and is situated in the space above 2 / 3 of the height of the filter cartridge 103.

[0104] The receiving pipe 102 can be installed vertically or inclined at the top of the tank 101, serving as a channel for raw materials to enter the tank 101. The filter cartridge 103 is located inside the receiving pipe 102, and at least a portion of the filter cartridge 103 can extend into the tank 101. The top of the filter cartridge 103 is provided with a feed inlet 108, and the bottom and sides are provided with multiple filter holes 109. The filter cartridge 103 is used to hold and buffer the raw materials and to achieve filtration.

[0105] The hopper 201 is connected to the receiving pipe 102 via the discharge pipe 228, and is used to feed raw materials into the filter cartridge 103 through the feed port 108. The spray head assembly 307 is installed inside the filter cartridge 103 and is located in the space above 2 / 3 of the height of the filter cartridge 103. This raises the installation position of the spray head assembly 307, which allows the spray head 312 to spray water downward from a high position, effectively increasing the spray coverage area. This can wash away and dissolve the raw materials adhering to or accumulating on the filter cartridge 103, preventing blockage of the filter holes 109.

[0106] During automatic liquid preparation, the hopper 201 feeds the raw material into the filter cartridge 103 through the feed pipe 228, and sprays water into the raw material in the filter cartridge 103 through the spray head assembly 307. The water flow washes and dissolves the raw material in the filter cartridge 103, and the resulting solution flows out through the filter holes 109 at the bottom and side of the filter cartridge 103 and enters the tank 101.

[0107] Therefore, the above-described settings in this application embodiment can improve the dissolution efficiency of raw materials and the uniformity of the solution.

[0108] In some embodiments, refer to Figure 10 and Figure 11 As shown, a dust cover 104 is detachably connected to the receiving pipe 102. The hopper 201 is connected to the dust cover 104, and the dust cover 104 is provided with an opening 105. A valve plate 106 is provided on one side edge of the opening 105. The valve plate 106 is used to open or close the opening 105.

[0109] The dust cover 104 is used to seal the feed pipe 102 to prevent raw materials from escaping during feeding and to avoid polluting the external environment. The main pipe 314 of the spray head assembly 307 passes through the dust cover 104 for connection to the external automatic filling pipeline 305. A discharge pipe 107 is located in the middle of the dust cover 104. The upper end of the discharge pipe 107 extends to the outside of the top of the dust cover 104 for connection to the feed pipe 228. The lower end of the discharge pipe 107 extends through the inlet 108 into the filter cartridge 103, and is located 1 / 5 to 1 / 4 of the height below the inlet 108 of the filter cartridge 103 to achieve stable feeding. The first ring pipe 315 and the second ring pipe 316 of the spray head assembly 307 are arranged around the discharge pipe 107, so that multiple spray heads 312 are arranged around the discharge pipe 107 to improve the spraying effect on the raw materials and help improve the dissolution efficiency.

[0110] Furthermore, in automatic water injection mode, valve plate 106 is closed; in manual water injection mode, valve plate 106 can be opened so that the spray gun can extend into the dust cover 104 through opening 105 to inject water into the filter cartridge 103; alternatively, the entire dust cover 104 and related pipelines can be disassembled so that the spray gun can directly inject water into the filter cartridge 103. In addition, valve plate 106 can be a transparent plate to facilitate observation of material feeding and water injection in automatic water injection mode.

[0111] In addition, such as Figure 1 As shown, the feed pipe 228 can be a flexible hose, which makes it easy to move the upper end of the feed pipe 228 below the dust cover 104 directly into the collection bucket 226.

[0112] In some embodiments, refer to Figure 2 As shown, the feeding device 2 includes a filter 205, which is connected to the hopper 201. The negative pressure device 204 is connected to the filter 205 via the suction pipe 210 and to the dust cover 104 via the exhaust pipe 227.

[0113] Before material intake, the discharge valve 202 is initially closed. At this time, the valve plate 106 on the dust cover 104 is opened to connect the internal environment of the preparation tank 1 with the external environment through the opening 105 on the dust cover 104. The exhaust pipe 227 is connected to the internal environment of the preparation tank 1 through the dust cover 104. This allows the exhaust pipe 227 to connect to the external environment through the opening 105, so that when the negative pressure device 204 is working, a negative pressure can be formed in the hopper 201 through the suction pipe 210 to ensure the material intake function. At the same time, by connecting the exhaust pipe 227 to the dust cover 104, a small amount of raw material that is not completely filtered in the negative pressure device 204 can be discharged into the preparation tank 1, avoiding pollution of the external environment. After material intake is completed, the negative pressure device 204 is closed, and the valve plate 106 can also be closed.

[0114] The control method for the liquid preparation system provided in the embodiments of this application will be described below. The control method of the liquid preparation system in the following embodiments can be compared with the liquid preparation system in the above embodiments.

[0115] In some embodiments, the liquid preparation system includes: a preparation tank 1, a feeding device 2, and a water supply device 3. The feeding device 2 includes a hopper 201, a discharge valve 202, a suction pipe 203, and a negative pressure device 204. The hopper 201 is connected to the preparation tank 1, the discharge valve 202 is located between the hopper 201 and the preparation tank 1, and the negative pressure device 204 is connected to the suction pipe 203 via the hopper 201. The water supply device 3 includes a water supply structure 301 and a flow valve 302. The water supply structure 301 is connected to the preparation tank 1, and the flow valve 302 is located in the water supply structure 301. (See reference...) Figure 14 As shown in the figure, this application embodiment also provides a control method for a liquid preparation system, including the following steps.

[0116] S141, Obtain the liquid preparation command.

[0117] Operators can manually input liquid preparation instructions into controller 4. The instructions may include liquid preparation-related parameters, such as target solution concentration, raw material mass (i.e., the subsequent first set target value), and water volume (i.e., the subsequent second set target value).

[0118] S142. According to the liquid preparation instruction, turn on the negative pressure device 204 and suck the raw material into the hopper 201 through the suction pipe 203. When it is confirmed that the amount of material supplied in the hopper 201 has reached the first set target value, turn off the negative pressure device 204.

[0119] When the controller 4 is powered on and receives the liquid preparation command, it starts the negative pressure device 204. Under negative pressure, the powdered raw material in the external raw material bag is sucked into the hopper 201 through the suction pipe 203. During the suction process, the feed amount (i.e., the increase in raw material in the hopper 201) can be detected in real time using a sensor (such as a weighing sensor) installed on the hopper 201. The detected value is compared with a first set target value stored in the controller 4. If the detected value does not reach the first set target value, suction continues through the suction pipe 203 until the detected value reaches the first set target value. At this point, the controller 4 generates a shutdown signal to shut down the negative pressure device 204 and stop suction. This application avoids the errors caused by traditional manual weighing, realizes on-demand quantitative feeding, and ensures the accuracy of raw material addition.

[0120] Furthermore, when it is confirmed that the feed rate in hopper 201 has reached the first set target value, the negative pressure device 204 can be controlled for a preset suction time to ensure that there is no raw material residue in the suction pipe 203 before the negative pressure device 204 is turned off. This can solve the clogging problem caused by raw material residue while ensuring the target concentration range of the solution, reducing maintenance frequency and improving system reliability.

[0121] S143. Open the discharge valve 202 to allow the raw materials in the hopper 201 to fall into the preparation tank 1. After confirming that the discharge is complete, close the discharge valve 202.

[0122] After confirming that the feeding is complete, the controller 4 opens the discharge valve 202, allowing the raw materials in the hopper 201 to fall into the preparation tank 1 by gravity. After the feeding is completed, the discharge valve 202 is closed, and the addition of raw materials is completed.

[0123] The confirmation of material discharge completion can be achieved based on at least one of the following methods: time control, weight change, and flow state detection. For example: through delay control, after a preset delay time following the opening of the discharge valve 202, material discharge is confirmed to be complete; through zero-weighing detection, the weight of the hopper 201 is continuously monitored by a sensor, and material discharge is confirmed to be complete when the weight decreases to within the allowable error range of the initial empty hopper weight; through detector monitoring, a detector installed in the hopper 201 is used to acquire images or signals of the raw material flow state in real time, and material discharge is confirmed to be complete when no raw material flow is detected.

[0124] S144. Open the flow valve 302 and supply water to the preparation tank 1 through the water supply structure 301. When it is confirmed that the water supply has reached the second set target value, close the flow valve 302 to complete the solution preparation.

[0125] After the raw materials are added, the flow valve 302 is opened, and the raw materials are flushed and dissolved through the water supply structure 301. During the water supply process, the flow meter 303 installed in the water supply structure 301 is used to obtain the cumulative water supply in real time and transmit the data to the controller 4. The controller 4 compares the obtained cumulative water supply with the stored second set target value and calculates the deviation. The opening of the flow valve 302 is dynamically adjusted (such as by PID control) according to the deviation to achieve precise flow control. When the cumulative water supply reaches the second set target value, the controller 4 closes the flow valve 302 and stops the water supply, finally obtaining a solution that meets the target concentration requirements.

[0126] Therefore, the control method of the liquid preparation system provided in this application embodiment realizes full automation from material suction and feeding to water supply, solves the problems of low efficiency and poor accuracy of traditional manual liquid preparation, and significantly improves the liquid preparation efficiency and concentration control accuracy.

[0127] In some embodiments, the feeding device 2 includes a filter 205, which is located between the negative pressure device 204 and the hopper 201. The filter 205 is connected to an air source via a backflush pipe 207, and a backflush valve 208 is provided in the backflush pipe 207. After the step of confirming that the feeding is completed and before the step of closing the feeding valve 202, the device further includes the step of: opening the backflush valve 208, using the airflow provided by the air source to backflush the filter 205 and the hopper 201 through the backflush pipe 207 to blow the residual raw materials into the preparation tank 1, and closing the backflush valve 208 after confirming that the backflush is completed.

[0128] Once the controller 4 detects that the feeding process is complete, it can start the backflushing program, open the backflushing valve 208, and allow compressed air to enter the filter 205 through the backflushing pipeline 207. This will blow the small amount of raw material remaining in the filter 205 and hopper 201 into the preparation tank 1. When the backflushing operation reaches the preset number of backflushing times (e.g., 2 to 4 times, with each backflushing lasting 2 to 4 seconds) or the cumulative backflushing time, the backflushing is confirmed to be complete. The backflushing valve 208 is then closed to stop the backflushing. Finally, the feeding valve 202 is closed to prepare for the subsequent water supply and dissolution steps.

[0129] Therefore, by performing a backflushing operation on the filter 205, this embodiment of the application can solve the clogging problem caused by raw material residue while ensuring the target concentration range of the solution, thereby reducing maintenance frequency and improving system reliability.

[0130] In some embodiments, the water supply device 3 includes a flow meter 303, which is disposed in the water supply structure 301; see reference Figure 15 As shown, the steps to confirm that the water supply has reached the second set target value include: S151. Water is supplied to the preparation tank 1 through the water supply structure 301 to dissolve the raw materials.

[0131] When water is supplied to the preparation tank 1, the controller 4 first activates the water supply structure 301 to supply water for the first time according to the second set target value (i.e., the required water volume). The main purpose of this step is to provide solvent for the raw materials so that they can begin to dissolve.

[0132] S152. Use flow meter 303 to obtain the current water supply in real time, and compare the current water supply with the second set target value.

[0133] S153. If the current water supply does not reach the second set target value, continue to replenish water to the preparation tank 1 through the water supply structure 301 until the current water supply reaches the second set target value.

[0134] During the water supply process, the flow meter 303 in the water supply structure 301 continuously monitors the actual water supply volume and feeds this data back to the controller 4 in real time. The controller 4 then compares the actual water supply volume with a preset second target value to determine whether the current water supply has reached the preset value. If the actual water supply volume is lower than the set target value, the controller 4 will trigger a water replenishment mechanism to continue replenishing water to the preparation tank 1 through the water supply structure 301 until the water supply volume accurately reaches the second target value. At this point, water replenishment stops, and the solution preparation is completed.

[0135] Therefore, by monitoring and dynamically adjusting the water supply in real time, the embodiments of this application can minimize water supply errors, making the final solution concentration more accurate and meeting the needs of nuclear power plants for high-precision solution preparation.

[0136] In some embodiments, the water supply structure 301 includes a spray head assembly 307 and a spray gun, the spray head assembly 307 being disposed inside the preparation tank 1; the step of supplying water to the preparation tank 1 through the water supply structure 301 includes: Obtain the water injection mode command; If the water injection mode command is automatic water injection mode, the control flow valve 302 will open, and water will be automatically sprayed into the preparation tank 1 through the spray head assembly 307; If the water injection mode command is manual water injection mode, then water is manually sprayed into the preparation tank 1 using a spray gun.

[0137] The controller 4 receives the operation command and identifies whether it is an automatic water injection mode or a manual water injection mode. If it is an automatic water injection mode, the controller 4 opens the flow valve 302 in the water supply structure 301 and automatically supplies water through the spray head assembly 307; if it is a manual water injection mode, the automatic water supply is stopped and the operator opens the spray gun to spray water manually.

[0138] Therefore, the embodiments of this application realize dual-mode water supply of automatic spraying and manual spray gun, which improves the continuity of solution preparation, reduces equipment downtime, and solves the problems of single water injection mode and insufficient emergency response capability in traditional boric acid solution preparation systems.

[0139] In some embodiments, the preparation tank 1 is provided with a dust cover 104, the hopper 201 is connected to the dust cover 104, the dust cover 104 is provided with an openable and closable opening 105, and a valve plate 106 is provided at the opening 105; the feeding device 2 includes a filter 205, the filter 205 is connected to the hopper 201, the negative pressure device 204 is connected to the filter 205 via an air intake pipe 210, and is connected to the dust cover 104 via an exhaust pipe 227; the control method of the liquid preparation system provided in this application embodiment further includes the steps of: opening the valve plate 106 before turning on the negative pressure device 204; when it is confirmed that the amount of material supplied in the hopper 201 has reached a first set target value, turning off the negative pressure device 204 and closing the valve plate 106.

[0140] Before material intake, the discharge valve 202 is closed. At this time, the valve plate 106 on the dust cover 104 is opened, connecting the internal environment of the preparation tank 1 to the external environment via the opening 105 on the dust cover 104. The exhaust pipe 227 is connected to the internal environment of the preparation tank 1 via the dust cover 104, allowing the exhaust pipe 227 to connect to the external environment through the opening 105. This ensures that when the negative pressure device 204 is working, a negative pressure can be created in the hopper 201 via the suction pipe 210, guaranteeing the material intake function. Simultaneously, by connecting the exhaust pipe 227 to the dust cover 104, any small amount of raw material that is not completely filtered in the negative pressure device 204 can be discharged into the preparation tank 1, preventing pollution of the external environment. After material intake is complete, the negative pressure device 204 is closed, and the valve plate 106 is also closed to prevent raw material from escaping into the external environment during subsequent material intake.

[0141] In some embodiments, the control method for the liquid preparation system provided in this application further includes the following steps: If an abnormal state is detected during the solution preparation process, an alarm signal is generated, the solution preparation system is shut down, and an alarm message is sent to the user.

[0142] Alarm signals may include, but are not limited to: material suction timeout (pipe blockage, raw material depletion), weighing sensor malfunction, etc.; no flow meter signal, actual water volume not reaching the set value for a long time (valve not open), flow exceeding limits, etc.; overload of negative pressure equipment, valve jamming, etc. These signals can be collected in real time by sensors and transmitted to controller 4 for storage (for easy retrieval), and controller 4 determines whether to trigger an alarm. When any of the above abnormalities are detected during system operation, the following steps are executed: controller 4 issues a command to stop all running actuators, such as booster pump, negative pressure equipment 204, flow valve 302, backflush valve 208, discharge valve 202, etc. In addition, controller 4 can send alarm information to the operator's mobile phone, computer, and other terminal devices via wired or wireless communication for reminder.

[0143] Therefore, the embodiments of this application can improve the safety of the system by handling shutdown alarms when the liquid preparation system is running abnormally.

[0144] The control method of the liquid preparation system provided in the embodiments of this application is described below with reference to a specific example.

[0145] After the operator breaks open a 25kg barrel of boric acid, they insert the suction pipe 203 into the raw material bag, open the valve plate 106 on the dust cover 104, and then the PLC controller starts the Roots blower. Under negative pressure, the boric acid in the bag is sucked into the hopper 201 through the suction pipe 203. After the entire barrel of boric acid is sucked, it is emptied for a period of time to ensure that there is no boric acid in the suction pipe 203, and then the Roots blower is turned off. Next, the PLC controller opens the discharge valve 202, and the boric acid in the hopper 201 enters the preparation tank 1 through the discharge pipe 228. After the discharge is completed, the PLC controller opens the backflush valve 208, using compressed air to backflush, blowing the small amount of boric acid remaining in the filter 205 and the hopper 201 into the preparation tank 1. After the backflush is completed, the discharge valve 202 is closed. Then, the PLC controller starts the booster pump and opens the flow valve 302, spraying water into the preparation tank 1 through the spray head 312 to flush and dissolve the boric acid raw material. The spraying is then stopped, completing the addition of one barrel of boric acid raw material. In the actual solution preparation process, since the spray water is mainly used to flush and dissolve the boric acid and does not reach the total water volume required for the specified concentration, it is necessary to control the spray head 312 to replenish the remaining water volume at once to achieve the set total water volume for the desired concentration. After replenishment, the booster pump and flow valve 302 are turned off, completing the preparation of the boric acid solution.

[0146] The solution preparation system of this application can realize the repeated cyclic preparation of boric acid solution in multiple tanks (such as 5 tanks, 6 tanks, etc.), and can improve the accuracy and consistency of the concentration ratio of each tank.

[0147] The above are merely preferred embodiments of this application and are not intended to limit the embodiments of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A control method for a liquid preparation system, characterized in that, The liquid preparation system includes a preparation tank, a feeding device, and a water supply device. The feeding device includes a hopper, a discharge valve, a suction pipe, and a negative pressure device. The hopper is connected to the preparation tank, the discharge valve is located between the hopper and the preparation tank, and the negative pressure device is connected to the suction pipe via the hopper. The water supply device includes a water supply structure and a flow valve. The water supply structure is connected to the preparation tank, and the flow valve is located within the water supply structure. The control method includes: Obtain the solution preparation instruction; According to the liquid preparation instruction, the negative pressure device is turned on, and the raw material is sucked into the hopper through the suction pipe. When it is confirmed that the amount of material supplied in the hopper has reached the first set target value, the negative pressure device is turned off. Open the discharge valve to allow the raw materials in the hopper to fall into the preparation tank. After confirming that the discharge is complete, close the discharge valve. Open the flow valve and supply water to the preparation tank through the water supply structure. When the water supply reaches the second set target value, close the flow valve to complete the solution preparation.

2. The control method for the liquid preparation system according to claim 1, characterized in that, The feeding device includes a filter, which is located between the negative pressure equipment and the hopper. The filter is connected to an air source via a backflush pipeline, and a backflush valve is provided in the backflush pipeline. After confirming that the material feeding is complete and before closing the feeding valve, the process also includes: Open the backflush valve and use the airflow provided by the air source to backflush the filter and the hopper through the backflush pipeline. After confirming that the backflush is complete, close the backflush valve.

3. The control method for the liquid preparation system according to claim 2, characterized in that, The steps to confirm that backflushing is complete include: When the backflushing operation reaches the preset number of backflushing operations or the cumulative backflushing time, confirm that the backflushing is complete.

4. The control method for the liquid preparation system according to claim 1, characterized in that, After confirming that the material supply in the hopper has reached the first set target value, and before turning off the negative pressure device, the method further includes: Control the negative pressure device to perform a preset suction time.

5. The control method for the liquid preparation system according to claim 1, characterized in that, The water supply structure includes a spray head assembly and a spray gun, wherein the spray head assembly is disposed inside the preparation tank; The step of opening the flow valve and supplying water to the preparation tank through the water supply structure includes: Obtain the water injection mode command; If the water injection mode command is automatic water injection mode, then the flow valve is opened and water is automatically sprayed into the preparation tank through the spray head assembly; If the water injection mode command is manual water injection mode, then water is manually sprayed into the preparation tank through the spray gun.

6. The control method for the liquid preparation system according to claim 1, characterized in that, The water supply device includes a flow meter, which is installed in the water supply structure; The steps to confirm that the water supply has reached the second set target value include: Water is supplied to the preparation tank through the water supply structure to dissolve the raw materials; The flow meter is used to obtain the current water supply in real time, and the current water supply is compared with the second set target value; If the current water supply does not reach the second set target value, water will continue to be added to the preparation tank through the water supply structure until the current water supply reaches the second set target value.

7. The control method for the liquid preparation system according to claim 1, characterized in that, The feeding device includes a sensor, which is mounted on the hopper; the step of confirming that the feeding amount in the hopper has reached a first set target value includes: The sensor is used to detect the amount of material fed into the hopper in real time, and the detected value is compared with the first set target value. If the detected value does not reach the first set target value, the material is continued to be sucked through the suction tube until the detected value reaches the first set target value.

8. The control method for the liquid preparation system according to claim 1, characterized in that, The steps to confirm that the material cutting is complete include: It is achieved based on at least one of the following methods: time control, weight change, and flow state detection.

9. The control method for the liquid preparation system according to claim 1, characterized in that, The preparation tank is equipped with a dust cover, the hopper is connected to the dust cover, the dust cover has an openable and closable opening, and a valve plate is provided at the opening; the feeding device includes a filter, the filter is connected to the hopper, the negative pressure device is connected to the filter via an air intake pipe and to the dust cover via an exhaust pipe; the control method further includes: Before turning on the negative pressure device, open the valve plate; When it is confirmed that the amount of material supplied in the hopper has reached the first set target value, the negative pressure device is turned off and the valve plate is closed.

10. The control method for the liquid preparation system according to any one of claims 1 to 9, characterized in that, The control method further includes: If an abnormal state is detected during the solution preparation process, an alarm signal is generated, the solution preparation system is shut down, and an alarm message is sent to the user.

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