Radioactive feed liquid metering and conveying device and system

Abstract

The utility model discloses a radioactive feed liquid metering and conveying device and system. 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; and the liquid outlet chamber measuring tube extends into the lower part of the liquid outlet chamber from the top of the liquid outlet chamber. The radioactive feed liquid metering and conveying device and the radioactive feed liquid metering and conveying system solve 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.

Description

Technical Field

[0001] The utility model 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 and system. Background Art

[0002] The transfer and transportation of post-processing liquids takes place within a sealed hot chamber. Appropriate transfer equipment is typically selected based on the characteristics of the radioactive liquid and the purpose and requirements of the transfer. Long-term operational experience has shown that radioactive liquid transfer equipment must meet three basic requirements: first, shielding safety measures must be implemented to minimize leakage and contamination; second, it must be easily controlled and operated indirectly or remotely to avoid excessive ionizing radiation exposure to personnel; and third, the parts in direct contact with the liquid must have minimal or no moving parts to avoid frequent replacement and repair due to failure of sealing materials or moving parts, as well as the release of radioactive material.

[0003] With technological advancements and accumulated operational experience, extensive research and development has been conducted to address the challenges of transporting radioactive liquids, resulting in the development of a range of effective transport equipment. Typical transport equipment commonly used in domestic reprocessing facilities includes vacuum siphons, air lifts, steam jet pumps, reverse flow pumps, liquid lifters, scoop flowmeters, plunger metering pumps, and centrifugal pumps. Air lifts, scoop flowmeters, and plunger metering pumps are particularly suitable for metering radioactive liquids.

[0004] The air lifter 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. During liquid conveying, there is a certain regularity between the compressed air flow rate and the amount of liquid lifted. When the air flow rate is within a certain range, the amount of liquid lifted increases with the air flow rate, representing the optimal operating range and suitable for flow metering. When the air flow rate falls below or exceeds this range, the liquid cannot be lifted, or the amount of liquid lifted reaches the system's maximum and remains virtually unchanged, or even decreases, with significant flow rate fluctuations. Airlifts also have disadvantages such as low efficiency and limited conveying capacity, as well as several limitations: ① The riser tube must be submerged at least 35%, increasing the design height of the hot cell; ② They rely on density differences, resulting in low power and pressure head, resulting in self-flow of the liquid after gas-liquid separation, making them unsuitable for applications such as filter feeding; ③ They introduce large amounts of compressed air, making them unsuitable for conveying easily oxidizable liquids. Liquid entrainment in the separation exhaust increases the amount of radioactive waste gas to be processed. Therefore, airlifts are not suitable for widespread, efficient, and stable metering and conveying of radioactive liquids.

[0005] The principle of the bucket flowmeter is similar to the ancient water wheel. It consists of a speed regulating motor, a wheel with a bucket, a material transfer trough, a receiving funnel, a shell and other parts. It is a metering and conveying device that uses a mechanical motor to provide power to ensure the 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 approximately 3.5%. Its flow rate depends primarily on the bucket size and motor speed. It is complex in structure, with numerous interfaces and rotating parts, and wall penetrations that can compromise the hot chamber's sealing barrier. Consequently, bucket flowmeters require remote maintenance and operation, posing significant challenges to the long-term safe and stable operation of process systems and the dose levels of workers, making them unsuitable for widespread and universal adoption.

[0006] The principle of a plunger metering pump is similar to that of a syringe. It consists of a motor, a transmission and adjustment mechanism such as a worm gear crank and connecting rod, a pump core with a plunger, seals and connectors, and a casing. The motor provides power to drive the plunger to move up and down through the transmission and adjustment mechanism, thereby sucking in 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, or blockage or corrosion of the valve ball, it is only suitable for the metering and delivery of non- or medium- to low-level room-temperature liquids with a viscosity not exceeding 0.5 Pa·s, no solid media, or solid particle size not exceeding 0.2 mm. The flow rate range is usually 0.02 to 1.2 m 3 / h, with an accuracy of approximately 2%. Furthermore, plunger metering pumps require frequent, indirect overhaul and maintenance. Currently, domestically used overhaul containers can only replace the pump core, a complex and time-consuming process that often compromises radiation shielding or gas sealing. Therefore, the application scenarios and prospects of plunger metering pumps are very limited, making them unsuitable for widespread and universal adoption.

[0007] The safe and reliable transportation of radioactive liquids is crucial during the reprocessing process, especially for high-temperature, strong acid, and medium-high discharge liquids, where precise flow control is crucial for safety and / or process reasons. Equipment maintenance must also be considered. Currently, there is no mature radioactive liquid metering and delivery equipment in China that can adequately meet these transportation and operational requirements. This situation remains underappreciated and underserved, a situation that is becoming increasingly challenging given the robust and orderly progress of major reprocessing plant projects in my country.

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

[0009] In response to the above-mentioned deficiencies in the existing technology, the present invention aims to provide a radioactive liquid metering and conveying device and system, 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 needs 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 utility model provides a radioactive liquid metering and conveying device, including an outer 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; the partition divides the internal space of the outer 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 side by side in the horizontal direction, the lower part of the liquid suction 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 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 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 suction chamber measuring pipe extends from the top of the liquid suction chamber into the lower part of the liquid suction chamber.

[0011] As an embodiment, it further 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 embodiment, the bottom of the flushing pipe forms a Venturi structure.

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

[0014] As an embodiment, the bottom of the liquid suction chamber is a downwardly concave curved structure.

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

[0016] As an embodiment, 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] The utility model provides a radioactive liquid metering and conveying system, comprising: the radioactive liquid metering and conveying device, 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 feed container and a feed pipe described in the utility model; the radioactive liquid metering and conveying device is fixed at a high place between the material receiving device 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 blowing liquid level gauge system composed of a pressure transmitter through the air blowing pipe; the flushing pipe is connected to the flushing liquid pipe; the exhaust 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 feed container through the feed pipe.

[0018] As an embodiment, it also includes reinforcing ribs and embedded plates; the embedded plates are embedded in the walls of the hot chamber, and the radioactive liquid metering and conveying device is fixed to the embedded plates by welding the reinforcing ribs.

[0019] The utility model adopts the above technical solution, so that it has the following beneficial effects:

[0020] 1. Through good layout design and equipment characteristics, the device can be installed at a high place between the two process equipment that outputs and receives the liquid. It 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 equipment usage and avoiding related maintenance activities and maintenance waste.

[0021] 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.

[0022] 3. Through safe measurement design and method selection, the corresponding liquid level height can be measured respectively through the measuring tube of the liquid discharge chamber and the measuring tube of the liquid suction chamber using the blowing method and the bubble method. 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 tube 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.

[0023] 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.

[0024] 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 clogging of the calibration hole that needs to be unblocked, it is free of replacement and maintenance throughout the life of the plant and has the seismic resistance to avoid unacceptable radioactive release and any critical events in earthquake events.

[0025] 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.

[0026] 7. Through sufficient geometric design, the liquid can overflow at the arc 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

[0027] 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 paying any creative work.

[0028] 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;

[0029] Figure 2 This is a front cross-sectional view of a radioactive liquid metering and conveying device according to an embodiment of the present application;

[0030] Figure 3 This is a front view of the radioactive liquid metering and conveying device according to an embodiment of the present application;

[0031] Figure 4 A three-dimensional diagram of the radioactive liquid metering and conveying device according to an embodiment of the present application in a first direction;

[0032] Figure 5 A perspective view of the radioactive liquid metering and conveying device according to an embodiment of the present application, viewed from a second direction;

[0033] Figure 6 A top view of a radioactive liquid metering and conveying device according to an embodiment of the present application;

[0034] Figure 7 A bottom view of the radioactive liquid metering and conveying device according to an embodiment of the present application;

[0035] Figure 8 This is a structural diagram of a radioactive liquid metering and delivery system according to an embodiment of the present application.

[0036] Description of Figure Numbers:

[0037] 1-pipette;

[0038] 2-Liquid outlet pipe;

[0039] 2'-overflow weir;

[0040] 3-Liquid outlet chamber;

[0041] 4-housing;

[0042] 5- liquid outlet chamber measuring tube;

[0043] 6-exhaust pipe;

[0044] 7-Flushing tube;

[0045] 7'-Venturi structure;

[0046] 8-pipet chamber measuring tube;

[0047] 9-partition;

[0048] 9'-calibration hole;

[0049] 10- aspiration chamber;

[0050] 11-Encoding;

[0051] 0- Radioactive liquid metering and conveying device;

[0052] 12-Reinforced ribs;

[0053] 13-embedded plate;

[0054] 14-hot room wall;

[0055] 15-hot room;

[0056] 16- Floor;

[0057] 17- Workshop;

[0058] 18-Blowing tube;

[0059] 19-flushing fluid pipe;

[0060] 20-exhaust pipe;

[0061] 21- compressed air jet pump;

[0062] 22- Material receiving equipment;

[0063] 22'- material connecting pipe;

[0064] 23-feed container;

[0065] 23'-Feed pipe. DETAILED DESCRIPTION

[0066] 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 embodiments described 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 efforts are within the scope of protection of the present invention.

[0067] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0068] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "installed," "connected," and "connected" should be understood in a broad sense. For example, "connected" can mean 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, an indirect connection through an intermediate medium, or internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0069] Example 1

[0070] See also Figures 1 to 8, a radioactive liquid metering and conveying device 0 of embodiment 1 of the present invention comprises a shell 4, a liquid suction pipe 1, a liquid outlet pipe 2, an air extraction pipe 6, a liquid outlet chamber measuring pipe 5, a liquid suction chamber 10 measuring pipe 8 and a partition 9; the partition 9 divides the internal space of the shell 4 into a liquid suction chamber 10 and a liquid outlet chamber 3; the liquid suction chamber 10 and the liquid outlet chamber 3 are connected at the top and the upper parts are arranged side by side in the horizontal direction, the lower part of the liquid suction 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 forms a calibration hole 9' in communication with the liquid suction chamber 10 at the bottom; 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 extraction pipe 6 is connected to the top of the liquid outlet chamber 3; the liquid outlet chamber measuring pipe 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 of the liquid outlet chamber measuring pipe 5 is higher than the top end of the liquid outlet pipe 2; the liquid suction chamber measuring pipe 8 extends from the top of the liquid suction chamber 10 into the lower part of the liquid suction chamber 10.

[0071] 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.

[0072] The partition 9 is L-shaped, and the calibration hole 9 ′ is formed on the bottom surface of the partition 9 and is flush with the bottom surface of the liquid outlet chamber 3 .

[0073] Among them: the exhaust pipe 6 is used to create, maintain and destroy the vacuum by pumping out the internal gas of the radioactive liquid metering and conveying device 0, thereby directly controlling 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, thereby determining 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, thereby regulating the flow rate; the calibration hole 9' is a key structure for flow measurement and control, and its diameter must be strictly controlled and accurately calibrated to ensure the accuracy of flow measurement and control.

[0074] The radioactive liquid metering and conveying device 0 is installed at a high position between the feed container 23 for outputting and receiving the liquid and the material receiving equipment 22. It does not require the installation of isolation valves and power pumps on the input and output pipelines and has no moving parts. This reduces the equipment usage and can achieve no replacement and maintenance during the entire life of the plant.

[0075] Liquid transfer is achieved through the coordinated structure of the suction pipe 6, liquid aspiration chamber 10, liquid aspiration pipe 1, calibrated hole 9', liquid discharge chamber 3, and liquid discharge pipe 2. The suction pipe 6 creates and maintains a negative pressure within the radioactive liquid metering and delivery device 0, thereby drawing liquid from the feed container 23 via the liquid aspiration pipe 1. The liquid is injected into the liquid aspiration chamber 10 and, under the action of the partition 9, reaches a high level. Based on the principle of a communicating vessel, it continuously flows into the liquid discharge chamber 3 through the calibrated hole 9' until it reaches the height of the overflow weir 2', overflowing through the liquid discharge pipe 2. The liquid then flows by gravity through the receiving pipe 22' to the receiving device 22, completing the liquid transfer.

[0076] The coordinated structure of the exhaust pipe 6, the liquid aspiration chamber measuring pipe 8, the liquid outlet chamber measuring pipe 5, and the overflow weir 2' enables flow measurement and regulation of the conveyed liquid. By measuring the time it takes for the liquid to enter the liquid outlet chamber 3 through the calibrated hole 9' and reach the height of the overflow weir 2', the outlet flow rate of the conveyed liquid can be determined. By varying the vacuum level within the radioactive liquid metering and conveying device 0 through the exhaust pipe 6, the liquid volume in the aspiration chamber 10 can be controlled, thereby adjusting the outlet flow rate of the conveyed liquid.

[0077] Example 2

[0078] The structure of a radioactive liquid metering and conveying device 0 in Example 2 of the present invention is basically the same as that in Example 1, except that it further 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'.

[0079] The bottom of the flushing pipe 7 forms a Venturi structure 7 ′.

[0080] The present invention provides a radioactive liquid metering and conveying system, comprising: the radioactive liquid metering and conveying device 0 described in 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 feeding container 23 and a feeding pipe 23'; the radioactive liquid metering and conveying device 0 is fixed at a high place between the material receiving device 22 and the feeding container 23; the liquid outlet chamber measuring pipe 5 and the liquid suction chamber measuring pipe 8 are respectively connected to the corresponding air blowing liquid level gauge system composed of a purge device and 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 feeding container 23 through the feeding pipe 23'.

[0081] In this embodiment, it further includes a reinforcing rib 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 12 .

[0082] In this embodiment, the layout and installation of the radioactive liquid metering and conveying device 0 are as follows:

[0083] The radioactive liquid metering and conveying device 0 and its associated piping are all housed within a hot chamber 15. The main housing 4 is welded to a pre-embedded plate 13 in the hot chamber wall 14 via reinforcing ribs 12. The hot chamber 15 is sealed off from the adjacent workroom 17 above by a floor 16. During factory installation, a unique code 11 is laser-engraved on the top of the radioactive liquid metering and conveying device 0 and entered into the factory's equipment management and operation control system. This 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 discharge pipe 2, liquid discharge 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.

[0084] The utility model provides a radioactive liquid metering and delivery method based on the radioactive liquid metering and delivery system of the utility model, comprising the steps of:

[0085] 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;

[0086] S2: Controlling the generation and maintenance of a stable negative pressure inside the current radioactive liquid metering and conveying device 0, sucking liquid from the feed container 23 through the liquid pipette; injecting the liquid into the liquid suction chamber 10 to a higher level under the action of the partition 9, and then filling the liquid discharge chamber 3 through the calibrated hole 9' until the liquid level reaches the height of the overflow weir 2', and then overflowing through the liquid discharge pipe 2 to the material receiving device 22;

[0087] S3: Using the corresponding air blowing tube 18, an inert gas is continuously introduced into 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, and the corresponding liquid level heights of the liquid suction chamber 10 and the liquid discharge chamber 3 are measured respectively by using a bubble method and an air blowing method;

[0088] S4: The outlet flow rate of the liquid delivery is determined by measuring the time from the liquid passing through the calibration hole 9' into the liquid outlet chamber 3 to the time it reaches the height of the overflow weir 2'; the liquid volume of the liquid suction chamber 10 is controlled by controlling and changing the internal vacuum degree of the radioactive liquid metering and delivery device 0, thereby adjusting the outlet flow rate of the liquid delivery;

[0089] 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.

[0090] In this embodiment, a method for controlling the start and stop of radioactive liquid delivery based on the radioactive liquid delivery system of the utility model is as follows:

[0091] After the liquid material transportation begins, the plant operation control system issues a command 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 out 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 due to the separation and blocking effect of the partition 9. At the same time, it is slowly filled into the upper half of the liquid discharge chamber 3 through the calibrated hole 9' at the bottom end 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 discharge chamber 3 reach a dynamic equilibrium and do not change temporarily. Since the liquid level in the suction chamber 10 is higher than the overflow liquid level in the liquid discharge chamber 3, according to the principle of communicating vessels, the material liquid will continuously pass through the calibrated hole 9' from the lower half of the suction chamber 10 into the upper half of the liquid discharge chamber 3, and then overflow from the overflow weir 2' through the liquid outlet pipe 2 and flow by gravity to the material receiving device 22 through the material receiving pipe 22', completing the transportation of the material liquid.

[0092] After the liquid feed is delivered, the plant operation control system issues an instruction 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 delivery 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'.

[0093] In this embodiment, a flow rate regulation and measurement method of a radioactive liquid metering and delivery method based on the radioactive liquid metering and delivery system of the utility model is as follows:

[0094] During the rated delivery phase, inert gas is continuously introduced into the liquid bottom of the liquid suction chamber 10 and the liquid upper surface of the liquid discharge chamber 3 through the corresponding air blowing pipe 18, respectively, through the liquid suction chamber measuring pipe 8 and the liquid discharge chamber measuring pipe 5. The corresponding liquid level heights are measured respectively by the air blowing method and bubble emission, thereby adjusting and measuring 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, thereby increasing the liquid level height in the liquid suction chamber 10, increasing the height difference between it and the overflow liquid level in the liquid discharge chamber 3, and thus increasing the outlet flow rate of the liquid discharge 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 discharge can be indirectly measured by measuring the time from the liquid discharge chamber 3 to the liquid discharge chamber 3 through the calibration hole 9' until it reaches the overflow weir 2' plane and overflows.

[0095] Example 3

[0096] The structure of a radioactive liquid metering and conveying device 0 in Example 3 of the present invention is substantially the same as that in Example 2, except that the bottom of the liquid aspiration chamber 10 has a downwardly concave curved surface. The curved surface of the bottom of the liquid aspiration chamber 10 facilitates liquid convergence, thereby reducing the time it takes for the liquid to flow back to the feed container 23 and reducing residual liquid.

[0097] The structure of a radioactive liquid metering and conveying system of 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 adopted.

[0098] The steps of a radioactive liquid metering and conveying method in the third embodiment of the present invention are basically the same as those in the second embodiment, except that a radioactive liquid metering and conveying system in the present embodiment is used.

[0099] Example 4

[0100] The fourth embodiment of the present invention is a radioactive liquid metering and conveying device 0, which has a structure substantially the same as that of the second embodiment, except that the top of the housing 4 is an arched, upwardly curved surface. The curved surface of the top of the housing 4 facilitates the collection and extraction of internal gas during the extraction process, thereby creating a better vacuum.

[0101] The structure of a radioactive liquid metering and conveying system of 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 adopted.

[0102] The fourth embodiment of the present invention is a method for metering and conveying radioactive liquid, and its steps are basically the same as those of the second embodiment, except that the radioactive liquid metering and conveying system of the present embodiment is used.

[0103] Example 5

[0104] The fifth embodiment of the present invention is a method for metering and conveying radioactive liquid. The steps are basically the same as those of the second embodiment. The difference is that, during the normal metering and conveying process, the method further includes the following steps:

[0105] Determine whether the calibration hole 9' is crystallized or blocked;

[0106] 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 .

[0107] The fifth embodiment of the present invention provides a method for metering and conveying radioactive liquid. The specific method for clearing the blockage of the calibration hole 9' is as follows:

[0108] Due to the characteristics of the post-processing radioactive liquid, there is a small probability that the calibration hole 9' will crystallize or become blocked during long-term operation. This can be judged by the difference between the measured flow rate and the estimated flow rate and the flow rate of upstream and downstream equipment. When the calibration hole 9' is crystallized or blocked, the flushing liquid (nitric acid or other materials that match the liquid) from the workshop 17 or other clean areas input through the flushing liquid pipe 19 is used to perform high-pressure flushing of the crystallized or blocked materials through the flushing pipe 7 directly above. 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 the 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'.

[0109] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A radioactive liquid metering and conveying device, characterized in that: The invention 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 divides the internal 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 side by side 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 below the liquid outlet chamber; a calibration hole is formed at the bottom of the liquid outlet chamber and is connected to the liquid suction 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 exhaust 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 end 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 according to 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 pressure transmitter to form an air level gauge system through the air blowing pipe; the flushing pipe is connected to the flushing liquid pipe; the exhaust 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 delivery system according to claim 8, characterized in that: It also includes a reinforcing rib 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.

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