Radioactive feed liquid metering and conveying device, system and method

Abstract

The invention discloses a radioactive feed liquid metering and conveying device, system and method. The device comprises a shell, a liquid suction pipe, a liquid outlet pipe, an exhaust pipe, a liquid outlet chamber measuring pipe, a liquid suction chamber measuring pipe and a partition plate. The partition plate divides the inner space of the shell into a liquid suction chamber and a liquid outlet chamber. The tops of the liquid suction chamber and the liquid outlet chamber are communicated, and the upper parts are arranged in parallel in the horizontal direction; the lower part of the liquid suction chamber extends downwards to be lower than the bottom of the liquid outlet chamber and partially extends below the liquid outlet chamber; a calibration hole communicated with the liquid suction chamber is formed in the bottom of the liquid outlet chamber; the liquid suction pipe is connected to the bottom of the liquid suction chamber; the liquid outlet pipe is connected to the bottom of the liquid outlet chamber and partially extends into the liquid outlet chamber; the exhaust pipe is connected to the top of the liquid outlet chamber; the liquid outlet chamber measuring tube extends into the lower part of the liquid outlet chamber from the top of the liquid outlet chamber; and the liquid suction chamber measuring tube extends into the lower part of the liquid suction chamber from the top of the liquid suction chamber. According to the radioactive feed liquid metering and conveying device, system and method, the problems that existing post-treatment radioactive feed liquid metering and conveying equipment cannot be widely and universally applied, and the requirements for accurate flow measurement and strict control in the feed liquid conveying or supplying process under multiple working conditions cannot be met are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of spent fuel post-processing radioactive material transfer, and in particular relates to a radioactive liquid metering and conveying device, system and method. Background Art

[0002] The transfer and transportation of the post-processing liquid is carried out in a closed hot chamber. It is usually necessary to select appropriate transportation equipment according to the characteristics of the radioactive liquid and the purpose and requirements of transportation. Long-term operation practice shows that the radioactive liquid transportation equipment must meet three basic conditions: first, shielding safety measures should be taken as much as possible during the transportation operation to avoid liquid leakage and pollution expansion; second, it should be easy to control and operate indirectly or remotely to avoid excessive ionizing radiation damage to the staff; third, the part in direct contact with the liquid should have as few or no moving parts as possible to avoid frequent replacement and maintenance caused by failure of sealing materials or moving parts and the release of radioactive substances.

[0003] With the development of technology and the accumulation of operating experience, a lot of scientific research has been carried out to solve the problem of transporting radioactive liquids, and a series of effective transport equipment has been developed. Typical transport equipment commonly used in domestic reprocessing facilities include vacuum siphon devices, air lifts, steam jet pumps, reverse flow steering pumps, liquid lifters, bucket flow meters, plunger metering pumps and centrifugal pumps, among which air lifts, bucket flow meters and plunger metering pumps can be used for metering and transporting radioactive liquids.

[0004] The air lift consists of a feed / receiver tank, a lifting pipe, an air blowing pipe, a gas-liquid separation tank, etc. It uses the principle of a communicating vessel and the density difference between the front and rear materials and liquids to lift the material from low to high through compressed air. It is suitable for small flow conveying, usually with a maximum flow of 0.2m 3 / h. There is a certain regularity between the compressed air flow rate and the lifted liquid in the process of liquid conveying. When the air flow rate is in a certain range, the liquid lifting volume increases with the increase of air flow rate, which is the best working range and the working range for flow metering. When the air flow rate is lower than or higher than this range, the liquid cannot be lifted or the liquid lifting volume reaches the highest value of the system and almost does not change, or even decreases instead of increasing, and the flow rate fluctuates greatly. The air lift also has the disadvantages of low efficiency and limited conveying capacity, and there are some restrictions on the use conditions: ① The immersion height of the lifting tube is ≥35%, which will increase the design height of the hot chamber; ② It relies on density difference to work, with low power and low pressure head. After gas-liquid separation, the liquid flows by itself, which is not suitable for filter feeding and other occasions; ③ A large amount of compressed air is introduced, which is not suitable for conveying easily oxidizable liquids, and the liquid is entrained in the separation exhaust gas, which increases the treatment capacity of radioactive waste gas. Therefore, the air lift is not suitable as a widespread, efficient and stable radioactive liquid metering and conveying equipment.

[0005] The principle of the bucket flowmeter is similar to the "waterwheel" used in ancient times to draw water. It consists of a speed regulating motor, a wheel with a bucket, a material transfer trough, a receiving funnel, a shell, etc. It is a metering and conveying device that uses a mechanical motor to provide power to ensure continuous and stable supply of extremely small flow rates. The conveying flow rate is usually no more than 0.08m 3 / h, with an accuracy of about 3.5%. Its delivery flow rate mainly depends on the bucket size and motor speed. It has a complex structure, numerous interfaces, rotating parts, and wall penetrations that will destroy the sealing barrier of the hot chamber. Therefore, the bucket flowmeter requires long-distance maintenance and operation, which poses a great challenge to the long-term safe and stable operation of the process system and the dose level of the staff, and is not suitable for widespread and universal use.

[0006] The principle of the plunger metering pump is similar to that of a "syringe". It consists of a motor, a transmission adjustment mechanism such as a worm gear crank and a connecting rod, a pump core with a plunger, seals and connectors, a housing, etc. The motor provides power to drive the plunger to move up and down through the transmission adjustment mechanism, thereby sucking and discharging the liquid. It controls the pump's displacement by adjusting the frequency and stroke of the plunger's reciprocating motion. Due to the high probability of pump failure and malfunction caused by damage to the plunger and sealing ring, clogging or corrosion of the valve ball, etc., it is only suitable for metering and conveying non-radioactive or medium-low-radioactive room-temperature liquids with a viscosity not exceeding 0.5Pa·s, no solid medium or a solid particle size not exceeding 0.2mm. The flow rate range is usually 0.02~1.2m 3 / h, with an accuracy of about 2%. At the same time, plunger metering pumps require frequent indirect overhaul and maintenance. The overhaul containers currently used in China can only replace the pump core. The replacement process is very complicated and time-consuming, and there is also a situation where radioactive shielding or gas sealing is sacrificed. Therefore, the application scenarios and prospects of plunger metering pumps are very limited, and they are not suitable for widespread and universal adoption.

[0007] The safe and reliable transportation of radioactive liquids is critical in the post-processing process, especially for the large flow and short distance transportation and supply of high-temperature strong acid medium-high discharge liquids, which must be accurately obtained and controlled due to safety and / or process factors. At the same time, the maintenance of equipment must also be considered. At present, there is no mature radioactive liquid metering and transportation equipment in China that can well meet the above transportation and operation requirements, and this situation has not yet received enough attention and effective response.

[0008] Therefore, there is an urgent need to conduct research on this problem and current situation, and to propose a new radioactive liquid metering and conveying device that can meet the requirements, so as to cope with various scenarios and different needs of the post-processing radioactive liquid transfer operating conditions and operating conditions. Summary of the invention

[0009] In view of the above-mentioned deficiencies in the prior art, the present invention aims to provide a radioactive liquid metering and conveying device, system and method, which solves the problem that the existing post-processing radioactive liquid metering and conveying equipment cannot be widely and generally applied and cannot meet the requirements of accurate measurement and strict control of flow rate during liquid conveying or supply under many working conditions.

[0010] In order to achieve the above-mentioned purpose, the present invention provides a radioactive liquid metering and conveying device, including an outer shell, a liquid pipette, a liquid outlet pipe, an exhaust pipe, a liquid outlet chamber measuring pipe, a liquid pipette chamber measuring pipe and a partition; the partition divides the internal space of the outer shell into a liquid pipette chamber and a liquid outlet chamber; the liquid pipette chamber and the liquid outlet chamber are connected at the top and the upper parts are arranged side by side in the horizontal direction, the lower part of the liquid pipette chamber extends downward below the bottom of the liquid outlet chamber and partially extends to the bottom of the liquid outlet chamber; a calibration hole connected to the liquid pipette chamber is formed at the bottom of the liquid outlet chamber; the liquid pipette is connected to the bottom of the liquid pipette chamber; the liquid outlet pipe is connected to the bottom of the liquid outlet chamber and partially extends into the liquid outlet chamber; the exhaust pipe is connected to the top of the liquid outlet chamber; the liquid outlet chamber measuring pipe extends from the top of the liquid outlet chamber into the lower part of the liquid outlet chamber, and the bottom end position of the liquid outlet chamber measuring pipe is higher than the top of the liquid outlet pipe; the liquid pipette chamber measuring pipe extends from the top of the liquid pipette chamber into the lower part of the liquid pipette chamber.

[0011] As an embodiment, it also includes a flushing tube, which extends from the top of the liquid outlet chamber into the bottom of the liquid outlet chamber, and the bottom pipe mouth position of the flushing tube corresponds to the position of the calibration hole.

[0012] As an implementation manner, the bottom of the flushing pipe forms a Venturi structure.

[0013] As an implementation mode, an overflow weir is formed at the top of the liquid outlet pipe.

[0014] As an implementation manner, the bottom of the liquid imbibition chamber is a curved structure that is concave downward.

[0015] As an implementation manner, the top of the shell is an arched upward curved structure.

[0016] As an implementation manner, the partition is L-shaped, and the calibration hole is formed on the bottom surface of the partition and is flush with the bottom surface of the liquid outlet chamber.

[0017] A radioactive liquid metering and conveying system of the present invention comprises: the radioactive liquid metering and conveying device of the present invention, an air blowing pipe, a flushing liquid pipe, an exhaust pipe, a compressed air jet pump, a material receiving device, a material receiving pipe, a feeding container and a feeding pipe; the radioactive liquid metering and conveying device is fixed at a high place between the material receiving device and the feeding container; the liquid outlet chamber measuring pipe and the liquid suction chamber measuring pipe are respectively connected to a corresponding air blowing liquid level gauge system composed of a purge device and a pressure transmitter through the air blowing pipe; the flushing pipe is connected to the flushing liquid pipe; the air extraction pipe is connected to the compressed air jet pump through the exhaust pipe; the liquid outlet pipe is connected to the material receiving device through the material receiving pipe; the liquid suction pipe is connected to the feeding container through the feeding pipe.

[0018] As an embodiment, it also includes a reinforcing rib frame and an embedded plate; the embedded plate is embedded in the wall inside the hot chamber, and the radioactive liquid metering and conveying device is welded and fixed to the embedded plate through the reinforcing rib frame.

[0019] A radioactive liquid metering and conveying method based on the radioactive liquid metering and conveying system of the present invention comprises the following steps:

[0020] S1: starting and operating the compressed air jet pump corresponding to the radioactive liquid metering and conveying device according to the code control, and extracting the gas inside the radioactive liquid metering and conveying device corresponding to the code and discharging it to the exhaust gas treatment system;

[0021] S2: Controlling the current radioactive liquid metering and conveying device to generate and maintain a stable negative pressure inside, and sucking liquid from the feed container through the liquid pipette; the liquid is injected into the liquid suction chamber to reach a higher height under the action of the partition, and is filled into the liquid outlet chamber through the calibrated hole until the liquid level reaches the overflow weir height, and then overflows to the material receiving device through the liquid outlet pipe;

[0022] S3: using the corresponding air blowing tubes to continuously introduce inert gas to the liquid bottom of the liquid suction chamber and the liquid upper surface of the liquid discharge chamber through the liquid suction chamber measuring tube and the liquid discharge chamber measuring tube, respectively, and using the bubble method and the air blowing method to measure the liquid level heights corresponding to the liquid suction chamber and the liquid discharge chamber, respectively;

[0023] S4: by measuring the time from the liquid passing through the calibrated hole into the liquid outlet chamber to reaching the overflow weir height, the outlet flow rate value of the liquid delivery is determined; by controlling and changing the internal vacuum degree of the radioactive liquid metering and conveying device to control the liquid volume in the liquid absorption chamber, the outlet flow rate of the liquid delivery is adjusted;

[0024] S5: After the liquid feed is delivered, the compressed air jet pump corresponding to the coding control of the radioactive liquid feed metering and delivery device stops working; the internal pressure of the radioactive liquid feed metering and delivery device is restored, the liquid feed stops being input and flows back to the feed container by gravity through the pipette.

[0025] As an implementation method, the method further includes the steps of:

[0026] Determining whether the calibration hole is crystallized or blocked;

[0027] If so, flushing liquid is input through the flushing liquid pipe, and the calibration hole is flushed with high pressure through the flushing pipe.

[0028] The present invention adopts the above technical solution, so it has the following beneficial effects:

[0029] 1. Through good layout design and equipment characteristics, the device can be installed at a high place between the two process equipments that output and receive the liquid, which is equivalent to a high-level gravity flow with built-in isolation and interception, without the need to install isolation valves and power pumps on the input and output pipelines, reducing the use of equipment and avoiding related maintenance activities and maintenance waste.

[0030] 2. Through effective functional design and structural coordination, the vacuum pipe can be used to create negative pressure to suck the liquid through the suction pipe. When the liquid level in the suction chamber is higher than the height of the overflow weir in the discharge chamber, based on the principle of communicating vessels, the liquid will continuously pass through the calibrated hole from the lower half of the suction chamber into the upper half of the discharge chamber, and then overflow from the overflow weir through the discharge pipe and flow by gravity through the receiving pipe to the receiving equipment, completing the delivery of the liquid.

[0031] 3. Through safe measurement design and method selection, the corresponding liquid level height can be measured through the measuring tube of the liquid outlet chamber and the measuring tube of the liquid suction chamber by using the blowing method and the bubble method respectively. The flow rate can be accurately adjusted and measured by changing the vacuum degree to control the liquid volume in the liquid suction chamber and the liquid level height above the calibration hole. The liquid level height can be accurately measured by the blowing method or the bubble method using a small-diameter capillary vertically close to the liquid surface or immersed in the liquid and close to the bottom, ensuring that the continuity and stability of liquid transportation can be met under different flow requirements.

[0032] 4. Through standardized dimensional design, the external dimensions are standardized to facilitate pipeline connection and final decommissioning. The internal dimensions can be set to several specifications and determined one by one according to process requirements and flow range, limiting the mass of radioactive liquid that can be accommodated, eliminating nuclear criticality risks, ensuring geometric safety and intrinsic safety, and being able to meet almost all requirements of post-processing conditions.

[0033] 5. Through reliable structural design, the device has a simple structure, reliable operation, no leakage and no moving parts. Except for the extremely low probability of blockage of the calibration hole that needs to be unblocked, it can be replaced and maintained free during the entire life of the plant, and has the earthquake resistance to avoid unacceptable radioactive release and any critical events in earthquake events.

[0034] 6. Through scientific optimization design, a Venturi structure is set at the lower part of the flushing pipe to enhance the outlet pressure of the flushing pipe. When the calibration hole is blocked, high-pressure flushing liquid can be input to promptly and smoothly impact and clear the blockage, thereby extending the service life and accuracy of the calibration hole and ensuring the accuracy of flow regulation and measurement.

[0035] 7. Through sufficient geometric design, the liquid can overflow from the curved weir of the overflow weir under the action of surface tension and form a weir flow higher than the weir level, thereby increasing the space for liquid adjustment and achieving uniform slow-release overflow of the liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 This is a schematic diagram of the internal structure of the radioactive liquid metering and conveying device according to an embodiment of the present application;

[0038] Figure 2 It is a front cross-sectional view of a radioactive liquid metering and conveying device according to an embodiment of the present application;

[0039] Figure 3 It is a front view of the radioactive liquid metering and conveying device according to an embodiment of the present application;

[0040] Figure 4 A three-dimensional diagram of the radioactive liquid metering and conveying device in the first direction of the embodiment of the present application;

[0041] Figure 5 A three-dimensional view of the radioactive liquid metering and conveying device in the embodiment of the present application in the second direction;

[0042] Figure 6 A top view of a radioactive liquid metering and conveying device according to an embodiment of the present application;

[0043] Figure 7 A bottom view of the radioactive liquid metering and conveying device according to an embodiment of the present application;

[0044] Figure 8This is a schematic diagram of the structure of the radioactive liquid metering and conveying system according to an embodiment of the present application.

[0045] Description of Figure Numbers:

[0046] 1-Pipette;

[0047] 2-Liquid outlet pipe;

[0048] 2'-overflow weir;

[0049] 3-Liquid outlet chamber;

[0050] 4- Shell;

[0051] 5-Liquid outlet chamber measuring tube;

[0052] 6-air extraction pipe;

[0053] 7-Flushing tube;

[0054] 7'-Venturi structure;

[0055] 8-pipet chamber measuring tube;

[0056] 9-partition;

[0057] 9'-calibration hole;

[0058] 10-imbibition chamber;

[0059] 11-Encoding;

[0060] 0- Radioactive liquid metering and conveying device;

[0061] 12-Reinforced ribs;

[0062] 13-embedded plate;

[0063] 14-Hot chamber wall;

[0064] 15-Hot chamber;

[0065] 16- Floor;

[0066] 17- Workshop;

[0067] 18-Blowing tube;

[0068] 19- flushing liquid pipe;

[0069] 20-exhaust pipe;

[0070] 21- compressed air jet pump;

[0071] 22- Material receiving equipment;

[0072] 22'- material receiving pipe;

[0073] 23-feed container;

[0074] 23'-Feed pipe. DETAILED DESCRIPTION

[0075] 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 only 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 making creative work are within the scope of protection of the present invention.

[0076] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", "connection" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] Example 1

[0079] See also Figures 1 to 8, a radioactive liquid metering and conveying device 0 according to the first embodiment of the present invention comprises a shell 4, a liquid pipette 1, a liquid outlet pipe 2, an air extraction pipe 6, a liquid outlet chamber measuring pipe 5, a liquid pipette 10 measuring pipe 8 and a partition 9; the partition 9 divides the internal space of the shell 4 into a liquid pipette chamber 10 and a liquid outlet chamber 3; the liquid pipette chamber 10 and the liquid outlet chamber 3 are connected at the top and the upper parts are arranged in parallel in the horizontal direction, the lower part of the liquid pipette chamber 10 extends downwardly below the bottom of the liquid outlet chamber 3 and partially extends to the bottom of the liquid outlet chamber 3; the liquid outlet chamber 3 A calibration hole 9' is formed at the bottom and communicated with the liquid suction chamber 10; the liquid suction pipe 1 is connected to the bottom of the liquid suction chamber 10; the liquid outlet pipe 2 is connected to the bottom of the liquid outlet chamber 3 and partially extends into the liquid outlet chamber 3; the air suction pipe 6 is connected to the top of the liquid outlet chamber 3; the liquid outlet chamber measuring tube 5 extends from the top of the liquid outlet chamber 3 into the lower part of the liquid outlet chamber 3, and the bottom end position of the liquid outlet chamber measuring tube 5 is higher than the top end of the liquid outlet pipe 2; the liquid suction chamber measuring tube 8 extends from the top of the liquid suction chamber 10 into the lower part of the liquid suction chamber 10.

[0080] An overflow weir 2' is formed at the top of the liquid outlet pipe 2. In this embodiment, the overflow weir 2' is trumpet-shaped.

[0081] The partition plate 9 is L-shaped, and the calibration hole 9 ′ is formed on the bottom surface of the partition plate 9 and is flush with the bottom surface of the liquid outlet chamber 3 .

[0082] Among them: the exhaust pipe 6 is used to create, maintain and destroy the vacuum by exhausting the internal gas of the radioactive liquid metering and conveying device 0, so as to directly control the suction of the liquid and the start and stop of the liquid conveying; the liquid outlet chamber measuring tube 5 is used to measure the liquid level height of the liquid outlet chamber 3 by the blowing method, so as to determine the flow rate; the liquid suction chamber measuring tube 8 is used to measure the liquid level height of the liquid suction chamber 10 by the bubble method, so as to regulate the flow rate; the calibration hole 9' is the key structure for flow measurement and control, and the diameter must be strictly controlled and accurately calibrated to ensure the accuracy of flow measurement and control.

[0083] The radioactive liquid metering and conveying device 0 is installed at a high place between the feed container 23 for outputting and receiving the liquid and the material receiving equipment 22. There is no need to install isolation valves and power pumps on the input and output pipelines and it has no moving parts, which reduces the equipment usage and can achieve no replacement and maintenance during the entire life of the factory.

[0084] Liquid delivery can be achieved through the structural coordination of the air extraction pipe 6, the liquid suction chamber 10, the liquid suction pipe 1, the calibration hole 9', the liquid outlet chamber 3, and the liquid outlet pipe 2. The negative pressure is created and maintained inside the radioactive liquid metering and conveying device 0 by the air extraction pipe 6, so that the liquid is sucked from the feed container 23 through the liquid suction pipe 1. The liquid is injected into the liquid suction chamber 10 and reaches a higher height under the action of the partition 9. Based on the principle of the communicating vessel, it is continuously filled into the liquid outlet chamber 3 through the calibration hole 9' until it reaches the height of the overflow weir 2' and overflows through the liquid outlet pipe 2, and then flows to the receiving device 22 by gravity through the receiving pipe 22', completing the liquid delivery.

[0085] Through the structural coordination of the air extraction pipe 6, the liquid suction chamber measuring pipe 8, the liquid outlet chamber measuring pipe 5, and the overflow weir 2', the flow rate measurement and control of the conveyed liquid can be realized. By measuring the time from the liquid passing through the calibration hole 9' and entering the liquid outlet chamber 3 to reaching the height of the overflow weir 2', the outlet flow value of the conveyed liquid can be measured. The vacuum degree inside the radioactive liquid metering and conveying device 0 can be changed through the air extraction pipe 6 to control the liquid volume in the liquid suction chamber 10, thereby adjusting the outlet flow rate of the conveyed liquid.

[0086] Example 2

[0087] A radioactive liquid metering and conveying device 0 of embodiment 2 of the present invention has a structure that is basically the same as that of embodiment 1, except that it also includes a flushing pipe 7, which extends from the top of the liquid outlet chamber 3 into the bottom of the liquid outlet chamber 3, and the bottom pipe mouth position of the flushing pipe 7 corresponds to the position of the calibration hole 9'.

[0088] The bottom of the flushing pipe 7 forms a venturi structure 7'.

[0089] A radioactive liquid metering and conveying system of the present invention comprises: the radioactive liquid metering and conveying device 0 of the present invention, an air blowing pipe 18, a flushing liquid pipe 19, an exhaust pipe 20, a compressed air jet pump 21, a material receiving device 22, a material receiving pipe 22', a feed container 23 and a feed pipe 23'; the radioactive liquid metering and conveying device 0 is fixed at a high place between the material receiving device 22 and the feed container 23; the liquid outlet chamber measuring pipe 5 and the liquid suction chamber measuring pipe 8 are respectively connected to the corresponding purge device and the air blowing liquid level gauge system composed of a pressure transmitter through the air blowing pipe 18; the flushing pipe 7 is connected to the flushing liquid pipe 19; the exhaust pipe 6 is connected to the compressed air jet pump 21 through the exhaust pipe 20; the liquid outlet pipe 2 is connected to the material receiving device 22 through the material receiving pipe 22'; the liquid suction pipe 1 is connected to the feed container 23 through the feed pipe 23'.

[0090] In this embodiment, it also includes a reinforcing rib frame 12 and an embedded plate 13 ; the embedded plate 13 is embedded in the hot chamber wall 14 , and the radioactive liquid metering and conveying device 0 is fixed to the embedded plate 13 by welding the reinforcing rib frame 12 .

[0091] In this embodiment, the layout and installation of the radioactive liquid metering and conveying device 0 are as follows:

[0092] The radioactive liquid metering and conveying device 0 and its attached pipelines are all placed in the hot chamber 15, the main body shell 4 is welded and fixed to the embedded plate 13 of the hot chamber wall 14 through the reinforcing ribs 12, and the hot chamber 15 is sealed and separated from the adjacent workroom 17 above by the floor 16. When the radioactive liquid metering and conveying device 0 is installed at the factory, a unique code 11 is laser engraved on the top and entered into the factory equipment management and operation control system. The code 11 is a unique number determined according to unified rules and is used for equipment management and information retrieval. The reserved process pipe openings of the radioactive liquid metering and conveying device 0, such as the liquid suction pipe 1, liquid outlet pipe 2, liquid outlet chamber measuring pipe 5, air extraction pipe 6, flushing pipe 7, and liquid suction chamber measuring pipe 8, are respectively connected to the feed pipe 23' of the feed container 23, the material receiving pipe 22' of the material receiving equipment 22, and the air blowing pipe 18, exhaust pipe 20, and flushing liquid pipe 19 of the public system. After precise calculation in the design stage and good assembly in the installation stage, it can ensure that the flow range is consistent with the process requirements and achieve the expected performance under the specified working conditions, meeting the requirements of long-term stable operation under post-processing conditions and continuous or intermittent metering and conveying of radioactive liquid.

[0093] A radioactive liquid metering and conveying method based on the radioactive liquid metering and conveying system of the present invention comprises the following steps:

[0094] S1: According to the code 11 of the radioactive liquid metering and conveying device 0, the corresponding compressed air jet pump 21 is controlled to start and work, and the gas inside the radioactive liquid metering and conveying device 0 corresponding to the code 11 is extracted and discharged to the exhaust gas treatment system;

[0095] S2: Control the current radioactive liquid metering and conveying device 0 to generate and maintain a stable negative pressure, and suck the liquid from the feed container 23 through the liquid pipette; the liquid is injected into the liquid suction chamber 10 to reach a higher height under the action of the partition 9, and is filled into the liquid outlet chamber 3 through the calibrated hole 9' until the liquid level reaches the height of the overflow weir 2', and then overflows to the receiving device 22 through the liquid outlet pipe 2;

[0096] S3: using the corresponding air blowing pipe 18 to continuously introduce inert gas to the liquid bottom of the liquid suction chamber 10 and the liquid upper surface of the liquid discharge chamber 3 through the liquid suction chamber measuring tube 8 and the liquid discharge chamber measuring tube 5, respectively, and using the bubble method and the air blowing method to measure the corresponding liquid level heights of the liquid suction chamber 10 and the liquid discharge chamber 3 respectively;

[0097] S4: by measuring the time from the liquid passing through the calibration hole 9' into the liquid outlet chamber 3 to reaching the height of the overflow weir 2', the outlet flow rate value of the liquid delivery is determined; by controlling and changing the internal vacuum degree of the radioactive liquid metering and conveying device 0 to control the liquid volume of the liquid suction chamber 10, the outlet flow rate of the liquid delivery is adjusted;

[0098] S5: After the liquid feed is delivered, the corresponding compressed air jet pump 21 is controlled to stop working according to the code 11 of the radioactive liquid feed metering and delivery device 0; the internal pressure of the radioactive liquid feed metering and delivery device 0 is restored, the liquid feed stops being input and flows back to the feed container 23 by gravity through the pipette 1.

[0099] In this embodiment, a method for starting and stopping the delivery of a radioactive liquid based on the radioactive liquid delivery system of the present invention is as follows:

[0100] After the start of liquid material transportation, the plant operation control system issues instructions according to the code 11, and the corresponding compressed air jet pump 21 starts and works, and the gas inside the radioactive liquid material metering and transportation device 0 is pumped from the exhaust pipe 20 to the exhaust gas treatment system through the exhaust pipe 6. A stable negative pressure is generated and maintained inside the radioactive liquid material metering and transportation device 0, and the liquid material is sucked from the feed container 23 through the liquid suction pipe 1. The liquid material enters the liquid suction chamber 10 through the feed pipe 23', and is quickly injected into the lower half of the liquid suction chamber 10 and reaches a higher height under the separation and blocking effect of the partition 9. At the same time, it is slowly filled into the upper half of the liquid outlet chamber 3 through the calibrated hole 9' at the bottom of the partition 9 until the liquid level reaches the height of the overflow weir 2'. At this time, the negative pressure inside the radioactive liquid material metering and transportation device 0, the suction of the liquid material, and the liquid level heights in the liquid suction chamber 10 and the liquid outlet chamber 3 reach a dynamic balance and do not change temporarily. Since the liquid level in the suction chamber 10 is higher than the overflow liquid level in the discharge chamber 3, according to the principle of communicating vessels, the liquid will continuously enter the upper discharge chamber 3 from the lower suction chamber 10 through the calibrated hole 9', and then overflow from the overflow weir 2' through the discharge pipe 2 and flow by gravity to the receiving device 22 through the receiving pipe 22', completing the delivery of the liquid.

[0101] After the liquid feed is transported, the plant operation control system issues a command according to the code 11, and the corresponding compressed air jet pump 21 stops working. The internal pressure of the radioactive liquid feed metering and transporting device 0 is quickly restored, thereby stopping the liquid feed input and allowing the liquid that has entered to flow back to the feed container 23 by gravity through the suction pipe 1 and the feed pipe 23'.

[0102] In this embodiment, a flow rate regulating and measuring method of a radioactive liquid metering and conveying method based on the radioactive liquid metering and conveying system of the present invention is as follows:

[0103] In the rated delivery stage, inert gas is continuously introduced to the bottom of the liquid in the liquid inhalation chamber 10 and the upper surface of the liquid in the liquid outlet chamber 3 through the corresponding air blowing pipe 18, respectively, through the liquid inhalation chamber measuring pipe 8 and the liquid outlet chamber measuring pipe 5, and the corresponding liquid level height is measured by the air blowing method and bubble emission, so as to adjust and measure the flow rate of the liquid delivery. When the flow rate needs to be increased, the vacuum degree inside the radioactive liquid metering and delivery device 0 is increased by the compressed air jet pump 21, so as to increase the liquid level in the liquid inhalation chamber 10, increase the height difference between it and the overflow liquid level in the liquid outlet chamber 3, and increase the outlet flow rate of the liquid outlet pipe 2. Since the inner diameter of the calibration hole 9' and the amount of liquid that can pass through are strictly measured, the flow rate of the liquid outlet can be indirectly measured by measuring the time from the liquid entering the liquid outlet chamber 3 through the calibration hole 9' to reaching the overflow weir 2' plane and overflowing.

[0104] Example 3

[0105] The structure of the radioactive liquid metering and conveying device 0 of the third embodiment of the present invention is basically the same as that of the second embodiment, except that the bottom of the liquid absorption chamber 10 is a curved surface structure that is concave downward. The curved surface structure at the bottom of the liquid absorption chamber 10 is conducive to the convergence of the liquid, so as to save the time for the liquid to flow back to the feed container 23 by gravity and reduce the residual liquid.

[0106] The structure of a radioactive liquid metering and conveying system according to the third embodiment of the present invention is basically the same as that of the second embodiment, except that the radioactive liquid metering and conveying device 0 of the present embodiment is used.

[0107] The steps of a radioactive liquid metering and conveying method according to the third embodiment of the present invention are basically the same as those of the second embodiment, except that a radioactive liquid metering and conveying system according to the present embodiment is used.

[0108] Example 4

[0109] The structure of the radioactive liquid metering and conveying device 0 of the fourth embodiment of the present invention is basically the same as that of the second embodiment, except that the top of the shell 4 is an arched upward curved surface structure. The curved surface structure at the top of the shell 4 is conducive to the convergence and extraction of the internal gas during the extraction process to create a better vacuum degree.

[0110] The structure of a radioactive liquid metering and conveying system according to the fourth embodiment of the present invention is basically the same as that of the second embodiment, except that the radioactive liquid metering and conveying device 0 of the present embodiment is used.

[0111] The steps of a radioactive liquid metering and conveying method according to the fourth embodiment of the present invention are basically the same as those of the second embodiment, except that a radioactive liquid metering and conveying system according to the present embodiment is used.

[0112] Example 5

[0113] The steps of a radioactive liquid metering and conveying method according to the fifth embodiment of the present invention are basically the same as those of the second embodiment, except that, during the normal liquid metering and conveying operation, the method further comprises the following steps:

[0114] Determine whether the calibration hole 9' is crystallized or blocked;

[0115] If so, flushing liquid is input through the flushing liquid pipe 19, and the calibration hole 9' is flushed with high pressure through the flushing pipe 7.

[0116] In a method for metering and conveying radioactive liquid according to the fifth embodiment of the present invention, the specific method for clearing the blockage of the calibration hole 9' is as follows:

[0117] Due to the characteristics of the post-processing radioactive liquid, there is a small probability of crystallization or blockage of the calibration hole 9' during the long-term working process, which can be judged by the difference between the measured flow rate and the estimated flow rate and the flow rate of the upstream and downstream equipment. When the calibration hole 9' is crystallized or blocked, the flushing liquid (nitric acid or other liquid matching) from the workshop 17 or other clean areas input through the flushing liquid pipe 19 is used to high-pressure flush the crystallized or blocked material through the flushing pipe 7 close to the top. The venturi structure 7' at the lower end of the flushing pipe 7 can greatly increase the flushing liquid, thereby increasing the outlet pressure of the flushing liquid, and can more effectively flush the crystallization or blockage of the calibration hole 9', extend its service life and maintain accuracy, thereby ensuring the accuracy of the flow rate regulation and measurement of the liquid delivered by the radioactive liquid metering and conveying device 0. The flushing liquid that has completed flushing and unblocking falls into the lower suction chamber 10, gathers at its bottom and flows to the feed container 23 by gravity through the suction pipe 1 and the feed pipe 23'.

[0118] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A radioactive liquid metering and conveying device, characterized in that: It comprises a shell, a liquid suction pipe, a liquid outlet pipe, an air extraction pipe, a liquid outlet chamber measuring pipe, a liquid suction chamber measuring pipe and a partition; the partition separates the inner space of the shell into a liquid suction chamber and a liquid outlet chamber; the liquid suction chamber and the liquid outlet chamber are connected at the top and the upper parts are arranged in parallel in the horizontal direction, the lower part of the liquid suction chamber extends downwardly below the bottom of the liquid outlet chamber and partially extends to the bottom of the liquid outlet chamber; a calibration hole connected to the liquid suction chamber is formed at the bottom of the liquid outlet chamber; The liquid suction pipe is connected to the bottom of the liquid suction chamber; the liquid outlet pipe is connected to the bottom of the liquid outlet chamber and partially extends into the liquid outlet chamber; the air suction pipe is connected to the top of the liquid outlet chamber; the liquid outlet chamber measuring tube extends from the top of the liquid outlet chamber into the lower part of the liquid outlet chamber, and the bottom end of the liquid outlet chamber measuring tube is higher than the top of the liquid outlet pipe; the liquid suction chamber measuring tube extends from the top of the liquid suction chamber into the lower part of the liquid suction chamber.

2. The radioactive liquid metering and conveying device according to claim 1, characterized in that: It also includes a flushing pipe, which extends from the top of the liquid outlet chamber into the bottom of the liquid outlet chamber, and the bottom pipe opening position of the flushing pipe corresponds to the position of the calibration hole.

3. The radioactive liquid metering and conveying device according to claim 2, characterized in that: The bottom of the flushing pipe forms a Venturi structure.

4. The radioactive liquid metering and conveying device according to claim 2, characterized in that: The top of the liquid outlet pipe forms an overflow weir.

5. The radioactive liquid metering and conveying device according to claim 1, characterized in that: The bottom of the liquid suction chamber is in a downwardly concave curved structure.

6. The radioactive liquid metering and conveying device according to claim 1, characterized in that: The top of the shell is an arched upward curved structure.

7. The radioactive liquid metering and conveying device according to claim 1, characterized in that: The partition is L-shaped, and the calibration hole is formed on the bottom surface of the partition and is flush with the bottom surface of the liquid outlet chamber.

8. A radioactive liquid metering and delivery system, characterized in that: include: The radioactive liquid metering and conveying device, air blowing pipe, flushing liquid pipe, exhaust pipe, compressed air jet pump, material receiving equipment, material receiving pipe, feed container and feed pipe as described in any one of claims 4 to 7; the radioactive liquid metering and conveying device is fixed at a high place between the material receiving equipment and the feed container; the liquid outlet chamber measuring pipe and the liquid suction chamber measuring pipe are respectively connected to the corresponding purge device and the air level gauge system composed of the pressure transmitter through the air blowing pipe; the flushing pipe is connected to the flushing liquid pipe; the air extraction pipe is connected to the compressed air jet pump through the exhaust pipe; The liquid outlet pipe is connected to the material receiving device through the material receiving pipe; the liquid suction pipe is connected to the feeding container through the feeding pipe.

9. The radioactive liquid metering and conveying system according to claim 8, characterized in that: It also includes a reinforcing rib frame and an embedded plate; the embedded plate is embedded in the wall of the hot chamber, and the radioactive liquid metering and conveying device is welded and fixed to the embedded plate through the reinforcing rib frame.

10. A method for metering and conveying radioactive liquid based on the radioactive liquid metering and conveying system according to claim 8, comprising the steps of: S1: starting and operating the compressed air jet pump corresponding to the radioactive liquid metering and conveying device according to the code control, and extracting the gas inside the radioactive liquid metering and conveying device corresponding to the code and discharging it to the exhaust gas treatment system; S2: Controlling the current radioactive liquid metering and conveying device to generate and maintain a stable negative pressure inside, and sucking liquid from the feed container through the liquid pipette; the liquid is injected into the liquid suction chamber to reach a higher height under the action of the partition, and is filled into the liquid outlet chamber through the calibrated hole until the liquid level reaches the overflow weir height, and then overflows to the material receiving device through the liquid outlet pipe; S3: using the corresponding air blowing tubes to continuously introduce inert gas to the liquid bottom of the liquid suction chamber and the liquid upper surface of the liquid discharge chamber through the liquid suction chamber measuring tube and the liquid discharge chamber measuring tube, respectively, and using the bubble method and the air blowing method to measure the liquid level heights corresponding to the liquid suction chamber and the liquid discharge chamber, respectively; S4: by measuring the time from the liquid passing through the calibrated hole into the liquid outlet chamber to reaching the overflow weir height, the outlet flow rate value of the liquid delivery is determined; by controlling and changing the internal vacuum degree of the radioactive liquid metering and conveying device to control the liquid volume in the liquid absorption chamber, the outlet flow rate of the liquid delivery is adjusted; S5: After the liquid feed is delivered, the compressed air jet pump corresponding to the coding control of the radioactive liquid feed metering and delivery device stops working; the internal pressure of the radioactive liquid feed metering and delivery device is restored, the liquid feed stops being input and flows back to the feed container by gravity through the pipette.

11. The method for metering and conveying radioactive liquid according to claim 10, characterized in that: Also includes the steps: Determining whether the calibration hole is crystallized or blocked; If so, flushing liquid is input through the flushing liquid pipe, and the calibration hole is flushed with high pressure through the flushing pipe.

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