Long-period test system of nuclear reactor primary loop bubble conducting probe

Abstract

The utility model discloses a long-period test system of a nuclear reactor primary loop bubble conducting probe, which comprises a test tank body, a resistor heating belt is arranged on the outer wall of the test tank body, and liquid lead-based metal is filled in the test tank body; the test gas injection system is connected with the test tank body and is used for providing test gas for the liquid lead-based metal in the test tank body; the heating and temperature control system is connected with the test tank body and is used for providing test temperature for the liquid lead-based metal in the test tank body; and the dissolved oxygen concentration control system is connected with the test tank body and is used for providing the dissolved oxygen concentration for the liquid lead-based metal in the test tank body, so that the working stability of the conductive probe in the lead-based liquid metal environment can be tested for a long period under the conditions of given temperature and given dissolved oxygen concentration.

Description

Technical Field

[0001] The utility model relates to the technical field of reactor simulation experimental devices, in particular to a long-period test system for a bubble conductivity probe of a primary loop of a nuclear reactor. Background Art

[0002] In the reactor design, the primary loop of the LFR (Lead based fast reactor) core circulates high-temperature, low-pressure liquid lead-based metal, while the secondary loop circulates low-temperature, high-pressure liquid water. When an SGTR (Steam Generator Tube Rupture) accident occurs, due to the pressure difference between liquid lead-based metal and water, the high-pressure supercooled water in the secondary loop will spray toward the low-pressure liquid lead-based metal in the primary loop. The collision of the water jet and the liquid metal causes the "water hammer effect", the rapid vaporization of liquid water, and the steam explosion formed by water and high-temperature liquid lead and bismuth, thus forming a two-phase flow of liquid metal and water vapor in the primary loop, which may pose a threat to the safety of the reactor. The two-phase flow behavior and migration mechanism of gas in a liquid metal environment is a necessary prerequisite for studying SGTR accidents.

[0003] At present, the measurement technology for studying the two-phase flow of gas in liquid water has become relatively mature. In particular, conductivity probes have the advantages of fast response speed, high measurement accuracy, good mechanical properties, and relatively low manufacturing cost. They are the most widely used method for measuring two-phase flow parameters. However, lead-based metals are highly corrosive under high temperature conditions, and the erosion effect under superimposed flow conditions poses a serious challenge to the stability of the probe probe. Once the coating on the surface of the probe probe is corroded and eroded by the high-temperature liquid lead-based metal and falls off, it will cause probe measurement errors, and in severe cases, it will cause the probe to fail completely. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a long-period test system for a bubble conductivity probe of a primary loop of a nuclear reactor.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The utility model provides a long-period test system for a nuclear reactor primary circuit bubble conductivity probe, comprising:

[0007] A test tank body, wherein a resistance heating belt is arranged on the outer wall of the test tank body, and liquid lead-based metal is filled inside the test tank body;

[0008] A test gas injection system connected to the test tank body and providing test gas to the liquid lead-based metal inside the test tank body;

[0009] Connected to the test tank body, providing a heating and temperature control system for the test temperature of the liquid lead-based metal inside the test tank body;

[0010] The test tank body is connected to provide a dissolved oxygen concentration control system for testing the dissolved oxygen concentration of the liquid lead-based metal inside the test tank body.

[0011] Furthermore, the test gas injection system includes: a test gas injection device, a test gas injection valve and a test gas storage cylinder; the test gas storage cylinder is connected to the test gas injection device through the test gas injection valve; the test gas injection device is arranged below the test tank body, and inputs the test gas in the test gas storage cylinder into the interior of the test tank body.

[0012] Furthermore, the test gas is helium or carbon dioxide.

[0013] Furthermore, the heating and temperature control system includes: a thermocouple and a temperature measurement and control unit, wherein the thermocouple is inserted into the liquid lead-based metal inside the test tank body, and the temperature measurement and control unit is respectively connected to the thermocouple and the resistance heating belt on the outer wall of the test tank body.

[0014] Furthermore, a test tank upper cover is arranged above the test tank body, and the test tank upper cover is sealed and connected to the test tank body by a plurality of bolts.

[0015] Furthermore, the dissolved oxygen concentration control system includes: a dissolved oxygen concentration sensor, an oxygen-controlled gas pipeline, a dissolved oxygen concentration measurement and control unit, and an oxygen-controlled gas storage cylinder; the dissolved oxygen concentration sensor is arranged on the test tank cap and inserted into the liquid lead-based metal inside the test tank body, the oxygen-controlled gas pipeline is arranged on the test tank cap, and the dissolved oxygen concentration sensor is connected to the oxygen-controlled gas storage cylinder through the dissolved oxygen concentration measurement and control unit.

[0016] Furthermore, the long-period test system also includes: a conductivity probe measurement data acquisition system, which includes a conductivity probe body inserted into the liquid lead-based metal inside the test tank body, a conductivity probe data acquisition system for collecting conductivity probe signals, and a control computer for data storage. The conductivity probe body is connected to the control computer through the conductivity probe data acquisition system, the control computer is connected to the oxygen control gas pipeline, and the dissolved oxygen concentration sensor is also connected to the control computer through the dissolved oxygen concentration measurement and control unit.

[0017] Furthermore, the control computer is also connected to the oxygen control gas pipeline, and the dissolved oxygen concentration sensor is also connected to the control unit and the control computer through the dissolved oxygen concentration measurement.

[0018] Furthermore, the long-cycle test system also includes: an exhaust cleaning system, which includes a test tank exhaust valve, an exhaust natural cooling pipeline, a filter, a test tank exhaust water washing container, and a water washing container exhaust valve connected in sequence, and the test tank exhaust valve is arranged on the test tank cover and connected to the interior of the test tank body.

[0019] Furthermore, the material of the test tank body is 316L stainless steel or 316Ti stainless steel, and the inner wall of the test tank body is coated with a ceramic coating.

[0020] The implementation of this utility model has the following beneficial effects:

[0021] The utility model provides a test gas injection system, a heating and temperature control system, and a dissolved oxygen concentration control system for a test tank body filled with liquid lead-based metal, thereby achieving a long-term test of the working stability of a conductivity probe in a lead-based liquid metal environment under given temperature and given dissolved oxygen concentration conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a structural block diagram of a long-period test system for a nuclear reactor primary loop bubble conductivity probe provided by an embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of a long-period test system for a bubble conductivity probe of a nuclear reactor primary loop in one embodiment of the utility model;

[0025] Figure 3 is a schematic diagram of a conductivity probe data acquisition system in one embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the voltage value change when the bubble penetrates into or moves away from the probe in one embodiment of the utility model;

[0027] Among them, 10, test tank body; 101, resistance heating belt; 102, liquid lead-based metal; 103, test tank upper cover; 20, test gas injection system; 201, test gas injection device; 202, test gas injection valve; 203, test gas storage cylinder; 30, heating and temperature control system; 301, thermocouple; 302, temperature measurement and control unit; 40, dissolved oxygen concentration control system; 401, dissolved oxygen concentration sensor; 402, oxygen control gas pipeline; 403, dissolved oxygen concentration measurement and control unit; 404, oxygen control gas storage cylinder; 50, conductivity probe measurement data acquisition system; 501, conductivity probe body; 502, conductivity probe data acquisition system; 503, control computer; 60, exhaust cleaning system; 601, test tank exhaust valve; 602, exhaust natural cooling pipeline; 603, filter; 604, test tank exhaust water washing container; 605, water washing container exhaust valve. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0029] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0030] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0031] In order to ensure that the conductivity probe can work stably for a long time in a high-temperature liquid lead-based metal environment, it is necessary to conduct rigorous tests on its long-term stability, so as to screen the coating process of the probe tip and confirm the most suitable coating material, coating process, coating thickness and other key information, so as to provide important technical support for the application of conductivity probe in high-temperature liquid metal environment.

[0032] The embodiment of the utility model provides an experimental device for testing the performance of a conductivity probe for a long period in a high-temperature liquid lead-based metal environment, with a focus on testing the long-term stability of the conductivity probe in a high-temperature liquid metal strong corrosion environment, including the measurement accuracy of the probe and the stability of the probe tip coating.

[0033] like Figure 1 As shown, the embodiment of the utility model provides a long-period test system for a nuclear reactor primary circuit bubble conductivity probe, comprising:

[0034] A test tank body 10, wherein a resistance heating belt 101 is arranged on the outer wall of the test tank body 10, and liquid lead-based metal 102 is filled inside the test tank body;

[0035] A test gas injection system 20 connected to the test tank body 10 to provide test gas to the liquid lead-based metal 102 inside the test tank body 10;

[0036] A heating and temperature control system 30 connected to the test tank body 10 to provide a test temperature for the internal liquid lead-based metal 102 of the test tank body 10;

[0037] The dissolved oxygen concentration control system 40 is connected to the test tank body 10 to provide a test dissolved oxygen concentration for the liquid lead-based metal 102 inside the test tank body 10 .

[0038] Specifically, the test tank body 10 is used to provide a test environment for the conductivity probe, and the test tank body 10 is respectively connected to the test gas injection system 20, the heating and temperature control system 30, and the dissolved oxygen concentration control system 40. The test gas injection system 20 provides test gas for the liquid lead-based metal 102 inside the test tank body 10. The heating and temperature control system 30 can control the heating power of the resistance heating belt 101 on the outer wall of the test tank body 10, so as to maintain the liquid lead-based metal 102 loaded in the test tank body 10 at a specific temperature. The dissolved oxygen concentration control system 40 controls the dissolved oxygen concentration of the liquid lead-based metal 102 in the test tank body 10 at a preset level.

[0039] In one embodiment of the present invention, Figure 2 As shown, the test gas injection system 20 includes: a test gas injection device 201, a test gas injection valve 202 and a test gas storage cylinder 203; the test gas storage cylinder 203 is connected to the test gas injection device 201 through the test gas injection valve 202; the test gas injection device 201 is arranged below the test tank body 10, and inputs the test gas in the test gas storage cylinder 203 into the interior of the test tank body 10.

[0040] Specifically, the test gas stored in the test gas storage cylinder 203 is injected into the liquid lead-based metal 102 at the lower part of the test tank body 10 through the test gas injection valve 202 and the test gas injection device 201. In addition, in order to prevent the backflow of liquid metal, the pressure of the gas in the test gas storage cylinder 203 after passing through the pressure reducing valve should be slightly higher than the static pressure of the liquid lead-based metal 102 inside the test tank body 10.

[0041] In order not to affect the effect of oxygen control, it is recommended that the test gas be a gas with stable chemical properties and no chemical reaction with lead-based metals. In this embodiment, the test gas is helium or carbon dioxide.

[0042] In one embodiment of the present invention, Figure 2 As shown, the heating and temperature control system 30 includes: a thermocouple 301 and a temperature measurement and control unit 302. The thermocouple 301 is inserted into the liquid lead-based metal 102 inside the test tank body 10. The temperature measurement and control unit 302 is respectively connected to the thermocouple 301 and the resistance heating belt 101 on the outer wall of the test tank body 10.

[0043] Specifically, the thermocouple 301 is used to measure the temperature of the liquid lead-based metal 102 inside the test tank body 10, and the temperature signal measured by the thermocouple 301 is used for the temperature measurement and control unit 302 to adjust the heating power of the resistance heating belt 101, thereby ensuring that the liquid lead-based metal 102 loaded in the test tank body 10 is maintained at a specific temperature.

[0044] It can be understood that the number of thermocouples 301 can be determined according to actual needs. In the present embodiment, the number of thermocouples 301 is one. That is to say, considering that the liquid lead-based metal 102 has good thermal conductivity and in order to save materials, one thermocouple 301 is used to measure the temperature of the liquid lead-based metal 102.

[0045] In one embodiment of the present invention, Figure 2 As shown, a test tank upper cover 103 is disposed above the test tank body 10, and the test tank upper cover 103 is sealed and connected to the test tank body 10 by multiple bolts. In order to further increase the corrosion resistance under high temperature conditions, the bolts can be made of high temperature and corrosion resistant copper.

[0046] In one embodiment of the present invention, Figure 2 As shown, the dissolved oxygen concentration control system 40 includes: a dissolved oxygen concentration sensor 401, an oxygen control gas pipeline 402, a dissolved oxygen concentration measurement and control unit 403, and an oxygen control gas storage cylinder 404;

[0047] The dissolved oxygen concentration sensor 401 is arranged on the test tank cover 103 and inserted into the liquid lead-based metal 102 inside the test tank body 10, the oxygen control gas pipeline 402 is arranged on the test tank cover 103, and the dissolved oxygen concentration sensor 401 is connected with the control unit 403 and the oxygen control gas storage cylinder 404 through dissolved oxygen concentration measurement.

[0048] Specifically, the dissolved oxygen concentration signal in the liquid lead-based metal 102 measured by the dissolved oxygen concentration sensor 401 is used for the dissolved oxygen concentration measurement and control unit 403 to control the flow rate of the oxygen-controlled gas, thereby controlling the dissolved oxygen concentration of the liquid lead-based metal 102 inside the test tank body 10 to a preset level.

[0049] In one embodiment of the present invention, Figure 2 As shown, the long-period test system also includes: a conductivity probe measurement data acquisition system 50, the conductivity probe measurement data acquisition system 50 includes a conductivity probe body 501 inserted into the internal liquid lead-based metal 102 of the test tank body 10, a conductivity probe data acquisition system 502 for collecting conductivity probe signals, and a control computer 503 for data storage, and the conductivity probe body 501 is connected to the control computer 503 through the conductivity probe data acquisition system 502.

[0050] Specifically, the conductivity probe body 501 is inserted into the liquid lead-based metal 102 inside the test tank body 10 for stability test, and the conductivity probe data acquisition system 502 connected to the conductivity probe body 501 collects the conductivity probe signal, and the relevant information of the conductivity probe signal is stored in the control computer 503 for subsequent data processing.

[0051] The conductivity probe data acquisition system 502 can be implemented by existing technologies. Figure 3 As shown, the conductivity probe data acquisition system 502 includes a voltmeter for measuring the conductivity probe body. The conductivity probe body 501 is inserted into the liquid lead-based metal 102 inside the test tank body 10, and the conductivity probe data acquisition system 502 collects the conductivity probe signal of the conductivity probe body 501 reacting with the liquid lead-based metal 102. The current reaction status between the conductivity probe body 501 and the liquid lead-based metal 102 can be known according to the voltage value displayed by the voltmeter. Figure 4 As shown, when the bubble penetrates the conductivity probe body 501, the voltmeter displays a first voltage V1 (i.e., representing the liquid phase), and after a period of time, the voltmeter displays a second voltage V2 (i.e., representing the gas phase), and when the bubble leaves the conductivity probe body 501, the voltmeter displays the first voltage V1. It can be understood that the actual values ​​of the first voltage V1 and the second voltage V2 can be determined according to actual conditions.

[0052] In one embodiment of the utility model, the control computer 503 is also connected to the oxygen control gas pipeline 402, and the dissolved oxygen concentration sensor 401 is also connected to the control unit 403 and the control computer 503 through dissolved oxygen concentration measurement, so as to control the dissolved oxygen concentration of the liquid lead-based metal 102 in the test tank body 10.

[0053] In one embodiment of the present invention, Figure 2 As shown, the long-cycle test system also includes: an exhaust cleaning system 60, the exhaust cleaning system 60 includes a test tank exhaust valve 601, an exhaust natural cooling pipeline 602, a filter 603, a test tank exhaust water washing container 604, and a water washing container exhaust valve 605 connected in sequence, and the test tank exhaust valve 601 is set on the test tank cover 103 and connected to the inside of the test tank body 10.

[0054] Specifically, considering the harmfulness of lead-based metals to the environment and human body, the gas in the test tank body 10 is first cooled by natural cooling before being discharged to the external environment, and then passes through a gas filtration system (test tank exhaust valve 601, exhaust natural cooling pipeline 602, filter 603), and then further cooled and washed in the test tank exhaust water washing container 604, and then discharged to the atmosphere through the water washing container exhaust valve 605, so as to minimize the harm of heavy metals to the environment and experimental operators.

[0055] It is understandable that the material of the test tank body 10 can be determined according to actual needs. In this embodiment, the material of the test tank body 10 is 316L stainless steel or 316Ti stainless steel, which has strong corrosion resistance. In order to further increase the corrosion resistance under high temperature conditions, the inner wall of the test tank body 10 is coated with a ceramic coating.

[0056] The embodiment of the utility model provides a long-period test system for a bubble conductivity probe of a nuclear reactor primary circuit, including a test tank body, a resistance heating belt is arranged on the outer wall of the test tank body, and the interior of the test tank body is filled with liquid lead-based metal; a test gas injection system connected to the test tank body to provide test gas for the liquid lead-based metal inside the test tank body; a heating and temperature control system connected to the test tank body to provide a test temperature for the liquid lead-based metal inside the test tank body; and a dissolved oxygen concentration control system connected to the test tank body to provide a test dissolved oxygen concentration for the liquid lead-based metal inside the test tank body. The embodiment of the utility model provides a test gas injection system, a heating and temperature control system, and a dissolved oxygen concentration control system for the test tank body with liquid lead-based metal inside, so as to realize a long-period test of the working stability of the conductivity probe in a lead-based liquid metal environment under given temperature and given dissolved oxygen concentration conditions.

[0057] The above embodiments only express the preferred implementation modes of the present utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present utility model. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present utility model, and several deformations and improvements can be made, which all belong to the protection scope of the present utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the present utility model should belong to the scope covered by the claims of the present utility model.

Claims

1. A long-period test system for a nuclear reactor primary circuit bubble conductivity probe, characterized in that: include: A test tank body, wherein a resistance heating belt is arranged on the outer wall of the test tank body, and liquid lead-based metal is filled inside the test tank body; A test gas injection system connected to the test tank body and providing test gas to the liquid lead-based metal inside the test tank body; Connected to the test tank body, providing a heating and temperature control system for the test temperature of the liquid lead-based metal inside the test tank body; The test tank body is connected to provide a dissolved oxygen concentration control system for testing the dissolved oxygen concentration of the liquid lead-based metal inside the test tank body.

2. The long-period test system according to claim 1, characterized in that: The test gas injection system includes: a test gas injection device, a test gas injection valve and a test gas storage cylinder; the test gas storage cylinder is connected to the test gas injection device through the test gas injection valve; the test gas injection device is arranged below the test tank body, and inputs the test gas in the test gas storage cylinder into the interior of the test tank body.

3. The long-period test system according to claim 2, characterized in that: The test gas is helium or carbon dioxide.

4. The long-period test system according to claim 1, characterized in that: The heating and temperature control system includes: a thermocouple, a temperature measurement and control unit, the thermocouple is inserted into the liquid lead-based metal inside the test tank body, and the temperature measurement and control unit is respectively connected to the thermocouple and the resistance heating belt on the outer wall of the test tank body.

5. The long-period test system according to claim 1, characterized in that: A test tank upper cover is arranged above the test tank body, and the test tank upper cover is sealed and connected to the test tank body by a plurality of bolts.

6. The long-period test system according to claim 5, characterized in that: The dissolved oxygen concentration control system includes: a dissolved oxygen concentration sensor, an oxygen-controlled gas pipeline, a dissolved oxygen concentration measurement and control unit, and an oxygen-controlled gas storage cylinder; the dissolved oxygen concentration sensor is arranged on the test tank cap and inserted into the liquid lead-based metal inside the test tank body, the oxygen-controlled gas pipeline is arranged on the test tank cap, and the dissolved oxygen concentration sensor is connected to the oxygen-controlled gas storage cylinder through the dissolved oxygen concentration measurement and control unit.

7. The long-period test system according to claim 6, characterized in that: The long-period test system also includes: a conductivity probe measurement data acquisition system, which includes a conductivity probe body inserted into the liquid lead-based metal inside the test tank body, a conductivity probe data acquisition system for collecting conductivity probe signals, and a control computer for data storage, and the conductivity probe body is connected to the control computer through the conductivity probe data acquisition system.

8. The long-period test system according to claim 7, characterized in that: The control computer is also connected to the oxygen control gas pipeline, and the dissolved oxygen concentration sensor is also connected to the control unit and the control computer through the dissolved oxygen concentration measurement.

9. The long-period test system according to claim 5, characterized in that: The long-cycle test system also includes: an exhaust cleaning system, which includes a test tank exhaust valve, an exhaust natural cooling pipeline, a filter, a test tank exhaust water washing container, and a water washing container exhaust valve connected in sequence. The test tank exhaust valve is set on the test tank cover and connected to the interior of the test tank body.

10. The long-period test system according to any one of claims 1 to 9, characterized in that: The material of the test tank body is 316L stainless steel or 316Ti stainless steel, and the inner wall of the test tank body is coated with a ceramic coating.

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