Additive metering system and control method thereof

Abstract

The invention discloses an additive metering system and a control method thereof.The additive metering system is connected to an instrument compressed air distribution system and a radioactive waste plant exhaust ventilation system and comprises an additive metering tank, a first valve, a second valve, a third valve, a fourth valve and a curing barrel, one end of the first valve is connected with the additive metering tank, and the other end of the second valve is connected with the curing barrel; one end of the third valve is connected with the other end of the first valve, the other end of the third valve is connected with the curing barrel, one end of the second valve is connected with the other end of the first valve, and the other end of the second valve is connected with the instrument compressed air distribution system. The two ends of the fourth valve are connected with the solidification barrel and the radioactive waste plant exhaust ventilation system respectively. According to the invention, an additive metering pump and a flowmeter are omitted, and an instrument compressed air distribution system purging pipeline is added, so that the additive metering process is simple and effective, and the reliability and usability of the system are improved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power technology, and in particular to an additive metering system and a control method thereof. Background Art

[0002] In the Fangchenggang Phase II project, in order to improve the efficiency and quality of waste treatment, TES (solid waste treatment system) was designed as a key cement curing system, aiming to optimize the cement curing process by precisely controlling the dosage of additives. This system provides quantitative additives to the cement curing process through an additive metering system. Its main purpose is to reduce the amount of water used in the curing process, thereby not only improving curing efficiency but also reducing treatment costs. Accurate metering of additives is crucial to ensuring the water-cement ratio of the solidified body, as the water-cement ratio is directly related to the physical and chemical properties of the solidified body, such as strength, durability and stability.

[0003] However, in the actual operation of the 8TES cement curing line of the first Hualong One reactor in Fangchenggang, the additive metering system exposed a series of problems that seriously hindered the automated production process of the cement solid body. Specifically, when performing the additive metering task (TES-OF-413), it was found that the additive was not automatically drained to the dry material filling hood through the metering system. In addition, the metering accuracy of the flow meter 4396QD failed to meet the requirements of the commissioning outline, which directly affected the accuracy of the additive metering, and in turn had an adverse effect on the water-cement ratio control of the solid body.

[0004] More seriously, the M3×5 fastening bolts of the pressure plate on the flow meter counting disc fell off, which may not only cause inaccurate flow meter readings, but also cause equipment failure or safety hazards. At the same time, the back pressure regulating valve could not return to its seat, resulting in the back pressure valve being unable to cut off flow after the pump was started. These problems combined not only seriously affected the production efficiency and quality of the cement solidification body, but also severely restricted the overall reliability and availability of the TES system. Summary of the invention

[0005] The object of the present invention is to provide an additive metering system and a control method thereof, aiming to solve the problems of poor reliability and availability of the existing TES system.

[0006] An embodiment of the present invention provides an additive metering system, which is connected to an instrument compressed air distribution system and an exhaust ventilation system of a radioactive waste plant, and includes: an additive metering tank, a first valve, a second valve, a third valve, a fourth valve and a curing barrel, wherein one end of the first valve is connected to the additive metering tank, one end of the third valve is connected to the other end of the first valve, the other end of the third valve is connected to the curing barrel, one end of the second valve is connected to the other end of the first valve, the other end of the second valve is connected to the instrument compressed air distribution system, and both ends of the fourth valve are respectively connected to the curing barrel and the exhaust ventilation system of the radioactive waste plant.

[0007] Furthermore, the first valve is a manual isolation valve.

[0008] Furthermore, the second valve is an isolation valve.

[0009] Furthermore, the third valve is an isolation valve.

[0010] Furthermore, the fourth valve is an exhaust valve.

[0011] Furthermore, it also includes: a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline, wherein the two ends of the first pipeline are respectively connected to one end of the first valve and the additive metering tank, the two ends of the second pipeline are respectively connected to the other end of the first valve and one end of the third valve, the two ends of the third pipeline are respectively connected to the other end of the third valve and the curing barrel, the two ends of the fourth pipeline are respectively connected to one end of the second valve and the second pipeline, the two ends of the fifth pipeline are respectively connected to the curing barrel and the fourth valve, and the two ends of the sixth pipeline are respectively connected to the fourth valve and the exhaust ventilation system of the radioactive waste plant.

[0012] Furthermore, explosion-proof devices are installed on the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline.

[0013] Furthermore, a thickness detection device is provided in the additive metering tank to detect the thickness of the residual additive on the inner wall of the additive metering tank.

[0014] An embodiment of the present invention further provides a control method for an additive metering system, comprising:

[0015] Open the fourth valve and open the first valve after the additive is manually weighed and added into the additive metering tank;

[0016] After the first valve opening signal is triggered and the operator confirms to start filling, the third valve is opened;

[0017] After the additive in the additive metering tank is completely discharged, the first valve is closed;

[0018] Opening the second valve and closing the second valve after being opened continuously for a first predetermined time;

[0019] After the trigger of the first valve opening signal disappears and the operator confirms the end of filling, the third valve is closed;

[0020] Close the fourth valve.

[0021] Furthermore, closing the first valve after the additive in the additive metering tank is completely discharged comprises:

[0022] After the additive in the additive metering tank is completely discharged, the first valve is closed after waiting for a second predetermined time.

[0023] Furthermore, the second predetermined time is 60s-300s.

[0024] Furthermore, the first predetermined time is 10s-60s.

[0025] Further, the method includes: after the trigger of the first valve opening signal disappears:

[0026] Delay for the third scheduled time.

[0027] Furthermore, the third predetermined time is: 120s-300s.

[0028] Furthermore, after closing the third valve, the method includes: delaying for a fourth predetermined time.

[0029] The present invention discloses an additive metering system and a control method thereof. The system is connected to an instrument compressed air distribution system and a radioactive waste plant exhaust ventilation system, and includes: an additive metering tank, a first valve, a second valve, a third valve, a fourth valve and a curing barrel, one end of the first valve is connected to the additive metering tank, one end of the third valve is connected to the other end of the first valve, the other end of the third valve is connected to the curing barrel, one end of the second valve is connected to the other end of the first valve, the other end of the second valve is connected to the instrument compressed air distribution system, and the two ends of the fourth valve are respectively connected to the curing barrel and the radioactive waste plant exhaust ventilation system. The present invention deletes the additive metering pump and flow meter, and adds a purge pipeline of the instrument compressed air distribution system, so that the additive metering process is simple and effective, the production efficiency and quality of cement solidification are improved, and the reliability and availability of the system are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0031] Figure 1 It is a structural schematic diagram of an additive metering system in the prior art;

[0032] Figure 2 A schematic flow chart of a control method for an additive metering system in the prior art;

[0033] Figure 3 This is a schematic diagram of the opening and closing process of the suction and discharge valve group of the metering pump;

[0034] Figure 4 It is a schematic diagram of the structure of the additive metering system after adding the back pressure valve;

[0035] Figure 5 This is the working principle diagram of the oval gear flowmeter;

[0036] Figure 6 It is a structural schematic diagram of the additive metering system after the back pressure valve position is adjusted;

[0037] Figure 7 It is a schematic diagram of energy conduction for additive metering;

[0038] Figure 8 is a schematic structural diagram of the additive metering system of this embodiment;

[0039] Fig. 9 is a flow chart of a control method of an additive metering system according to the present embodiment;

[0040] Fig.10 FIG. 4 is another flow chart of the control method of the additive metering system of this embodiment. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0043] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0044] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0045] See also Figure 1 and Figure 2 In the original design, when the Hualong One nuclear power plant was processing solid waste cement solidification, the filling cover exhaust valve 4942VR (i.e. Figure 2 Start 8TES4942VA- in the process and start the additive metering pump 4395PO to transfer the additive (start TES4395PO-). When the flow meter 4396QD reaches the given value required by the formula, stop the additive metering pump 4395PO (i.e. Figure 2 Close TES4395PO- in the filling cover, and then close the filling cover exhaust valve 4942VR (i.e. Figure 2 The closing 8TES4942VA-) in the middle completes the metering of the additive.

[0046] In the above scheme, there are many problems in the actual debugging process. For example, the additive metering system cannot intercept the additive. Specifically, the debugging personnel added additives to the additive metering tank 4390BA, opened the manual isolation valve 4391VR, and found that the additives flowed directly to the dry material filling cover by gravity; the metering pump and the metering flow did not start the metering process.

[0047] The reasons why the additive metering system cannot intercept additives were analyzed and found: Figure 1 It can be seen that when the additive metering pump 4395PO is not started, the additive in the system is intercepted by the additive metering pump 4395PO. By analyzing the schematic diagram of the opening and closing process of the suction and discharge valve group of the additive metering pump 4395PO (such as Figure 3As shown in the figure, when the additive metering pump 4395PO is not started, the volume of the pump chamber remains unchanged, and the height difference from the additive temporary storage tank to the metering pump inlet is 5 meters. The 5-meter pressure difference can push the ball valves at the suction port and the discharge port of the additive metering pump 4395PO to the open state, and the additive is directly discharged from the additive storage tank to the dry material filling cover. Therefore, the additive metering pump 4395PO does not have the interception characteristic for the liquid medium.

[0048] Therefore, it is necessary to add a valve to intercept the additive in a static state, and adding a back pressure regulating valve is the solution with the least modification. In this embodiment, a back pressure regulating valve 4392VR is added between the flow meter 4396QD and the additive metering pump 4395PO to solve the problem that the system cannot intercept the flow. The flow chart is as follows: Figure 3 shown.

[0049] After adding the back pressure regulating valve 4392VR between the flow meter 4396QD and the additive metering pump 4395PO, when the additive metering pump 4395PO is not started, the additive will no longer flow directly from the additive metering tank into the dry material filling cover, and the problem of the system being unable to intercept the flow is solved.

[0050] However, after adding a back pressure regulating valve 4392VR between the flow meter 4396QD and the additive metering pump 4395PO, it was found during the debugging process that the metering accuracy of the flow meter 4396QD did not meet the debugging outline requirements. Specifically, after solving the problem of the metering pump being unable to isolate the medium by adding a back pressure regulating valve, when performing the additive metering (TES-OF-413) task, the cumulative value of the flow meter 4396QD was compared with the actual transmission value of the additive, and it was found that the average deviation value was 28.51%, which could not meet the weight deviation requirement of ±2% of the system debugging outline.

[0051] The reason why the flow meter 4396QD metering accuracy does not meet the requirements of the commissioning outline was analyzed and found:

[0052] See also Figure 5 Flow meter 4396QD is an oval gear flow meter, which is mainly composed of a housing and a pair of oval gears inside the housing. The oval gears and the cover plate form a crescent-shaped metering chamber. Under the action of the inlet and outlet pressure difference, the oval gear pump rotates. The pump controls the flow of liquid through a fixed metering chamber. The liquid is continuously discharged from the outlet, while the volume of the metering chamber remains unchanged. Each time the main shaft completes a circle of rotation, the pump can discharge a liquid volume equivalent to four times the volume of the metering chamber. By monitoring the number of rotations of the main shaft, the total flow of liquid passing through the flow meter can be accurately calculated.

[0053] According to the principle of the oval gear flowmeter, the premise for ensuring that the flowmeter can accurately measure is that the additive flowing through the flowmeter is a water entity. The commissioning personnel observed the additive discharge port of the dry material filling cover and found that the additive flowing out was not continuous, but splashing. At the same time, Figure 4 It can be seen that the pipe section at the rear end of the back pressure valve 4392VR is directly exposed to the atmosphere, and the pipe section without back pressure cannot ensure that the medium flowing through is a water entity.

[0054] From the above analysis, it can be seen that to ensure that the medium flowing through the flow meter is a water entity, it is necessary to ensure that there is a certain back pressure at the outlet of the flow meter. Therefore, in this embodiment, the back pressure valve 4392VR is arranged from before the flow meter to after the flow meter. The modified flow chart is as follows: Figure 6 As shown:

[0055] After the modification, the pump is started and the additive flowing out of the additive discharge port of the dry material filling cover is continuous without any additive splashing. This solves the problem that the medium flowing through the flow meter is a non-water entity.

[0056] By analyzing the reasons why the back pressure regulating valve cannot return to its seat, we found that:

[0057] The selected opening pressure of back pressure valve 4392VR is 0.1Mpa, and the height difference from the additive metering tank to the inlet of back pressure valve 4392VR is 5 meters. Therefore, the static pressure generated by the additive on the inlet of back pressure valve 4392VR is about 0.05Mpa. When the metering pump stops, the return pressure of the back pressure valve is less than 0.05Mpa, so the back pressure valve cannot return to its seat normally, resulting in the back pressure valve being unable to cut off the flow after the pump is started.

[0058] According to the requirements of Article 5.5 of the industry standard for self-operated pressure regulating valves "JB / T11049-2010", "the maximum opening and closing pressure difference of the pressure-opening pressure regulating valve is 20% of the set pressure. When the set pressure is less than 0.3MPa, the maximum opening and closing pressure difference is 0.06Mpa." 开启 -P 回座 =P 启闭压差 ≤0.06Mpa, P 回座 ≥0.1-0.06=0.04Mpa; therefore, by increasing the back pressure valve opening pressure Popen value, the back pressure valve return pressure value P 回座 , when P 开启 =0.12Mpa, P 回座 =0.06Mpa, the back pressure valve's return pressure is greater than 0.05Mpa, which can ensure that the back pressure valve can return normally to cut off the additive circuit. On-site by shortening the spring travel of the spring-type back pressure valve to increase the opening pressure P 开启值 After modifying the opening pressure value of the back pressure valve, the back pressure valve can cut off the circuit when the pump is stopped.

[0059] The cause analysis of the falling off of the fastening bolts on the upper pressure plate of the flow meter 4396QD counting code disk found that:

[0060] Since the metering pump is a plunger pump, the energy of its transmission medium is close to a half-sine wave (such as Figure 7 As shown in the figure, the oval gear of the flowmeter rotates under the action of the forward wave medium and completes the volume measurement. When the medium is transmitted to the spring-type back-pressure regulating valve, the spring-type back-pressure valve will generate a reverse energy wave during the valve disc closing process, which is transmitted to the oval gear of the flowmeter. At the same time, the oval gear of the flowmeter is subjected to two sets of energy waves with different phases and opposite directions, causing the oval gear to oscillate back and forth, and finally causing the fastening bolts of the pressure plate on the counting code disk to fall off.

[0061] From the above analysis, it can be seen that the additive metering system composed of a plunger pump, an elliptical gear flowmeter, a spring-type back pressure valve and other equipment cannot meet the requirements of the additive metering function. According to the actual situation, this embodiment changes the additive metering circuit from a power metering method to a gravity metering method. The specific contents are as follows.

[0062] See also Figure 8 The present embodiment provides an additive metering system, which is connected to an instrument compressed air distribution system (SAR) and a radioactive waste plant exhaust ventilation system (DWQ), and includes: an additive metering tank (i.e., an additive metering tank 4390BA), a first valve (i.e., a manual isolation valve 4391VR), a second valve (i.e., 4394VR), a third valve (i.e., 4393VR), a fourth valve (i.e., 4392VR) and a curing barrel, wherein one end of the first valve is connected to the additive metering tank, one end of the third valve is connected to the other end of the first valve, the other end of the third valve is connected to the curing barrel, one end of the second valve is connected to the other end of the first valve, the other end of the second valve is connected to the instrument compressed air distribution system, and both ends of the fourth valve are respectively connected to the curing barrel and the radioactive waste plant exhaust ventilation system.

[0063] This embodiment deletes the additive metering pump and flow meter, and adds a purge pipeline of the instrument compressed air distribution system, so that the additive metering process is simple and effective, the production efficiency and quality of the cement solidified body are improved, and the reliability and availability of the system are improved.

[0064] When additives need to be added, they are weighed in advance using a weighing scale according to the weight requirements of the cement curing formula, and then added to the additive metering tank. The weighed additives are transferred to the curing barrel by the gravity of the additives and the purge of the compressed air distribution system.

[0065] In some embodiments, the first valve is a manual isolation valve. The manual isolation valve allows an operator to manually open it when necessary to connect the additive metering tank and the curing tank. In an emergency, the operator can quickly close the valve to cut off the flow of additives to prevent potential accidents or contamination.

[0066] In some embodiments, the second valve is an isolation valve, such as a gate valve, a stop valve, a ball valve, a butterfly valve or a diaphragm valve. The second valve is used as an isolation valve, and its main function is to connect the compressed air distribution system for the instrument with the additive system when air is needed. When air is not needed, the valve can be closed to ensure the cleanliness and safety of the system.

[0067] In some embodiments, the third valve is an isolation valve, such as a gate valve, a stop valve, a ball valve, a butterfly valve or a diaphragm valve. The third valve connects the additive system with the curing barrel, and its isolation function ensures that the additive can be safely and effectively transferred to the curing barrel. After the additive transfer is completed, the valve can be closed.

[0068] In some embodiments, the fourth valve is an exhaust valve. As an exhaust valve, the fourth valve connects the curing barrel and the exhaust ventilation system of the radioactive waste plant. When the additive flows into the curing barrel, the gas in the curing barrel is allowed to be discharged into the ventilation system, thereby preventing the accumulation of gas in the plant and maintaining a good working environment and safety.

[0069] In some embodiments, it also includes: a first pipeline G1, a second pipeline G2, a third pipeline G3, a fourth pipeline G4, a fifth pipeline G5 and a sixth pipeline G6, wherein both ends of the first pipeline G1 are respectively connected to one end of the first valve and the additive metering tank, both ends of the second pipeline G2 are respectively connected to the other end of the first valve and one end of the third valve, both ends of the third pipeline G3 are respectively connected to the other end of the third valve and a curing barrel, both ends of the fourth pipeline G4 are respectively connected to one end of the second valve and the second pipeline G2, both ends of the fifth pipeline G5 are respectively connected to the curing barrel and the fourth valve, and both ends of the sixth pipeline G6 are respectively connected to the fourth valve and the exhaust ventilation system of the radioactive waste plant.

[0070] The first pipeline G1 connects the additive metering tank and the first valve, the second pipeline G2 connects the first valve and the third valve, and the third pipeline G3 connects the third valve and the curing barrel. The first pipeline G1, the second pipeline G2 and the third pipeline G3 are responsible for transporting the additive from the additive metering tank to the curing barrel. The fourth pipeline G4 connects the second valve and the second pipeline G2. By controlling the switch of the second valve, the compressed air in the instrument compressed air distribution system can flow from the fourth pipeline G4 into the second pipeline G2, and push the additive in the second pipeline G2 into the curing barrel. The fifth pipeline G5 connects the curing barrel and the fourth valve, and is responsible for transporting the gas in the curing barrel to the subsequent exhaust ventilation system for treatment. The sixth pipeline G6 connects the fourth valve and the exhaust ventilation system of the radioactive waste plant, serving as the final channel for gas discharge to ensure that the gas is effectively treated and discharged.

[0071] In some embodiments, explosion-proof devices are installed on the first pipeline G1, the second pipeline G2, the third pipeline G3, the fourth pipeline G4, the fifth pipeline G5 and the sixth pipeline G6.

[0072] The explosion-proof device can effectively prevent pipeline explosion caused by increased pressure in the pipeline, protecting the safety of operators and equipment.

[0073] In some embodiments, a thickness detection device is disposed in the additive metering tank to detect the thickness of the residual additive on the inner wall of the additive metering tank.

[0074] By real-time detection of the thickness of the residual additive on the inner wall of the additive metering tank, the remaining amount of additive in the tank can be accurately grasped. This helps to more accurately control the amount of additive put in, thereby improving the metering accuracy of the production process. At the same time, knowing the residual thickness of the additive can help operators replenish or clean up the additive in time to avoid waste or shortage of additives. This helps to optimize the use efficiency of additives and reduce production costs. In addition, during long-term storage or use of additives, deposits or agglomerates may form on the inner wall. By detecting the thickness of the residual additive on the inner wall, these deposits can be discovered and handled in time to prevent the occurrence of metering tank failures, and to prevent the deposits from flowing into the curing barrel to affect the performance of the cured body.

[0075] See also Fig. 9 and Fig.10 This embodiment further provides a control method for the additive metering system of the above embodiment, including:

[0076] S101: Open the fourth valve and wait for the additive to be manually weighed and added into the additive metering tank before opening the first valve;

[0077] S102: After the first valve opening signal is triggered and the operator confirms to start filling, the third valve is opened;

[0078] S103: After the additive in the additive metering tank is completely discharged, the first valve is closed;

[0079] S104: opening the second valve and closing the second valve after being opened for a first predetermined time;

[0080] S105: After the trigger of the first valve opening signal disappears and the operator confirms that the filling is finished, the third valve is closed;

[0081] S106: Close the fourth valve.

[0082] In some embodiments, closing the first valve after the additive in the additive metering tank is completely discharged comprises:

[0083] After the additive in the additive metering tank is completely discharged, the first valve is closed after waiting for a second predetermined time.

[0084] Once the additive in the additive metering tank is completely discharged, the system will automatically enter a short waiting period, the second predetermined time. This period of time is designed to ensure that all additives have been completely discharged and give any remaining additives in the pipeline sufficient time to flow to the destination. After the second predetermined time has passed, the first valve is closed. This action prevents any additional additives from entering the subsequent pipeline and prevents subsequent compressed gas from flowing into the additive metering tank.

[0085] In some embodiments, the second predetermined time is 60s-300s.

[0086] The second predetermined time is set to 60s-300s, which is flexible enough to be adjusted according to different additive types, emission conditions, etc. This enables the step to be applicable to a variety of different application scenarios, improving the adaptability and flexibility of the system.

[0087] In some embodiments, the first predetermined time is 10s-60s.

[0088] The first predetermined time is set to 10s-60s, which can ensure that the gas generated by the compressed air distribution system of the instrument discharges all additives into the curing barrel.

[0089] In some embodiments, after the first valve opening signal trigger disappears, the method includes:

[0090] Delay for the third scheduled time.

[0091] The third predetermined time delay is to wait for all the additives remaining in the pipeline to drip into the curing barrel below the wet material filling cover to prevent the additives from remaining in the pipeline. This can reduce the weight deviation of the additives, thereby improving the accuracy of additive metering.

[0092] In some embodiments, the third predetermined time is: 120s-300s.

[0093] Setting a relatively long time range (120 seconds to 300 seconds) as the third predetermined time can ensure that after the valve is closed, the additive remaining in the pipeline has enough time to drip into the curing barrel under the wet material filling hood. This time range fully considers the flow characteristics of the additive in the pipeline and the dripping delay that may be caused by factors such as pipeline shape, length, and additive viscosity.

[0094] After closing the third valve, the method includes: delaying for a fourth predetermined time. For example, the method may be set to delay for 3 seconds after closing the third valve before closing the fourth valve.

[0095] The fourth predetermined time is delayed to ensure that the gas in the curing barrel is effectively discharged.

[0096] In some embodiments, a method for controlling an additive metering system includes:

[0097] When the system starts executing the TES-OF-413 task, it will then execute step STEP1: open 8TES4942VA- (i.e. open the fourth valve). While executing step STEP1, it will also execute step STEP1a: manually weigh the additive and add 8TES4390BA-, and then manually open 8TES4391VR- (i.e. open the first valve after manually weighing the additive and adding it to the additive metering tank); then the system will determine whether it has received the 8TES4391VR4 trigger signal. When it is determined that the trigger signal of 8TES4391VR4 is received, step STEP2 is executed: the operator control screen confirms "start filling"; then step STEP3 is executed: open 8TES4393VR- (that is, open the fourth valve and open the first valve after the additive is manually weighed and added to the additive metering tank), and then step STEP3a is executed: after the additive in 8TES4390BA- is discharged, wait for [T1=60s~300s] and then close 8TES4391VR- (that is, wait for the additive in the additive metering tank to be discharged). After the additive is discharged, close the first valve); then manually open 8TES4394VA- [T2 = 10s ~ 60s] and then close 8TES4394VA- (that is, open the second valve and close the second valve after opening it for the first predetermined time); then the system will determine whether it has received the 8TES4391VR4 trigger disappearance signal. When the 8TES4391VR4 trigger disappearance signal is received, delay [T3 = 120s ~ 300s] and then execute step STEP4: the operator controls the screen to confirm "end of filling". Then execute step STEP: close 8TES4393VR- (that is, wait until the first valve opening signal trigger disappears and the operator confirms the end of filling before closing the third valve). Then delay 3s and execute step STEP6: close 8TES4942VA- (that is, close the fourth valve), so that the system executes the TES-OF-413 task end instruction.

[0098] The process includes multiple safety considerations. For example, after executing the additive discharge step, it is necessary to wait for a certain time (T1) before closing the first valve, which can ensure that the additive is completely discharged to avoid residue; similarly, after opening the second valve, it is also necessary to wait for a certain time (T2) before closing it, which can ensure the safety of the operation. In addition, confirming "start filling" and "end filling" through the operator control screen also increases the chance of human intervention, further improving safety.

[0099] The data after three consecutive automatic metering of additives in this embodiment are shown in Table 1. It can be seen from Table 1 that the deviations are all less than the ±2% requirement of the debugging outline, which lays a solid foundation for the cement curing task of the TES system.

[0100] Table 1

[0101]

[0102]

[0103] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0104] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0105] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. An additive metering system connected to an instrument compressed air distribution system and a radioactive waste plant exhaust ventilation system, characterized in that: include: An additive metering tank, a first valve, a second valve, a third valve, a fourth valve and a curing barrel, wherein one end of the first valve is connected to the additive metering tank, one end of the third valve is connected to the other end of the first valve, the other end of the third valve is connected to the curing barrel, one end of the second valve is connected to the other end of the first valve, the other end of the second valve is connected to the instrument compressed air distribution system, and both ends of the fourth valve are respectively connected to the curing barrel and the exhaust ventilation system of the radioactive waste plant.

2. The additive metering system according to claim 1, characterized in that: The first valve is a manual isolation valve.

3. The additive metering system according to claim 1, characterized in that: The second valve is an isolation valve.

4. The additive metering system according to claim 1, characterized in that: The third valve is an isolation valve.

5. The additive metering system according to claim 1, characterized in that: The fourth valve is an exhaust valve.

6. The additive metering system according to claim 1, characterized in that: Also includes: The first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline, the two ends of the first pipeline are respectively connected to one end of the first valve and the additive metering tank, the two ends of the second pipeline are respectively connected to the other end of the first valve and one end of the third valve, the two ends of the third pipeline are respectively connected to the other end of the third valve and the curing barrel, the two ends of the fourth pipeline are respectively connected to one end of the second valve and the second pipeline, the two ends of the fifth pipeline are respectively connected to the curing barrel and the fourth valve, and the two ends of the sixth pipeline are respectively connected to the fourth valve and the exhaust ventilation system of the radioactive waste plant.

7. The additive metering system according to claim 6, characterized in that: Explosion-proof devices are installed on the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline.

8. The additive metering system according to claim 1, characterized in that: A thickness detection device is arranged in the additive metering tank to detect the thickness of the residual additive on the inner wall of the additive metering tank.

9. A control method for an additive metering system according to any one of claims 1 to 8, characterized in that: include: Open the fourth valve and open the first valve after the additive is manually weighed and added into the additive metering tank; After the first valve opening signal is triggered and the operator confirms to start filling, the third valve is opened; After the additive in the additive metering tank is completely discharged, the first valve is closed; Opening the second valve and closing the second valve after being opened continuously for a first predetermined time; After the trigger of the first valve opening signal disappears and the operator confirms the end of filling, the third valve is closed; Close the fourth valve.

10. The control method according to claim 9, characterized in that: The step of closing the first valve after the additive in the additive metering tank is completely discharged comprises: After the additive in the additive metering tank is completely discharged, the first valve is closed after waiting for a second predetermined time.

11. The control method according to claim 10, characterized in that: The second predetermined time is 60s-300s.

12. The control method according to claim 9, characterized in that: The first predetermined time is 10s-60s.

13. The control method according to claim 9, characterized in that: The step of waiting for the first valve opening signal trigger to disappear includes: Delay for the third scheduled time.

14. The control method according to claim 13, characterized in that: The third predetermined time is: 120s-300s.

15. The control method according to claim 9, characterized in that: After closing the third valve, the method includes: delaying for a fourth predetermined time.

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