Magnetic shielding high-temperature lithium lead fluid pipeline section temperature field measurement system with temperature compensation

Abstract

The invention relates to the field of controllable nuclear fusion devices, and discloses a magnetic shielding high-temperature lithium lead fluid pipeline section temperature field measurement system with temperature compensation, which comprises at least two groups of shielding pipes inserted into a test container, and the shielding pipes are arranged in parallel and located in the same plane. Temperature sensors are uniformly arranged on each shielding tube at intervals along the tube length direction; a magnetic field exists in the test container, the detection end of the temperature sensor penetrates through the shielding pipe body from the inside of the shielding pipe and then is in contact with a medium in the test container, and the pipe body of the shielding pipe is configured to shield the magnetic field in the test container. According to the invention, the real section temperature of the high-temperature lead-lithium alloy during flowing can be reflected, the measurement precision is improved, the influence of magnetoresistive effect or magnetothermoelectric force on data measured by the temperature sensor in a strong magnetic field environment is greatly reduced through temperature compensation, the measured data is close to actual data, the measured deviation value is relatively low, and the measurement accuracy is improved. The real section temperature of the high-temperature lead-lithium alloy during flowing can be reflected, and the measurement precision is improved.

Description

Technical Field

[0001] The present invention relates to the field of controlled nuclear fusion devices, and in particular to a magnetically shielded high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation. Background Art

[0002] In the field of controlled nuclear fusion, liquid blankets are a key component in controlled nuclear fusion reactors due to their significant advantages: simple structure, economic efficiency, high efficiency, and the ability to extract tritium online. They utilize lithium-lead alloys as neutron multipliers, tritium breeders, and coolants. Because lithium-lead alloys are conductive fluids, they generate Lorentz forces in strong magnetic fields, significantly increasing flow pressure drop and reducing power generation efficiency. This effect is known as the MHD effect. To investigate the relationship between pressure drop, flow velocity, temperature, and magnetic field during the flow of high-temperature lead-lithium alloys in a magnetic field, it is necessary to measure the cross-sectional temperature of the alloy and perform temperature field analysis.

[0003] During temperature field analysis, the temperature sensor is located in a strong magnetic field environment. Depending on the type of temperature sensor, the temperature data measured by the temperature sensor may deviate from the actual temperature value due to the magnetoresistance effect or magneto-thermoelectric potential. This cannot truly reflect the cross-sectional temperature of high-temperature lead-lithium alloy during flow, affecting the measurement accuracy. Therefore, this problem needs to be urgently addressed. Summary of the Invention

[0004] To avoid and overcome the technical problems of the prior art, the present invention provides a magnetically shielded, temperature-compensated system for measuring the cross-sectional temperature field of high-temperature lithium-lead fluid pipelines. This system can reflect the actual cross-sectional temperature of high-temperature lead-lithium alloys flowing through the pipeline, improving measurement accuracy.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A magnetically shielded temperature compensation system for measuring the cross-sectional temperature field of a high-temperature lithium-lead fluid pipeline comprises at least two sets of shielded tubes inserted into a test container. The shielded tubes are arranged parallel to each other and in the same plane. Temperature sensors are evenly spaced along the length of each shielded tube. A magnetic field exists within the test container, and the detection end of the temperature sensor passes through the shielding tube body and contacts the medium within the test container. The shielding tube body is configured to shield the magnetic field within the test container.

[0007] The actual temperature T measured by the temperature sensor on each shielding tube is:

[0008]

[0009] Wherein, T0 represents the displayed temperature of the temperature sensor;

[0010] B0 represents the environmental magnetic field value in the test container;

[0011] B1 represents the magnetic field value inside the shielding tube.

[0012] As a further solution of the present invention: a threaded thermal sleeve is coaxially sleeved outside the shielding tube body to reduce the flow resistance of the temperature sensor, and the thread pitch of the threaded thermal sleeve corresponds to the spacing between adjacent temperature sensors.

[0013] As a further solution of the present invention, the protruding length of the temperature sensor along the radial direction of the shielding tube corresponds to the thread wall thickness of the threaded thermal sleeve.

[0014] As a further solution of the present invention, the shielding tube is slidably fitted with the test container along its insertion direction and then fixed, and the shielding tube and the test container are rotationally fitted.

[0015] As a further solution of the present invention: a positioning thread is coaxially opened on one end of the shielding tube located outside the test container. After the shielding tube slides axially with the test container, it is locked and fixed by a positioning nut located outside the test container. A high-temperature resistant metal sealing gasket is provided on the locking surface of the positioning nut.

[0016] As a further solution of the present invention: the test container is provided with a positioning hole, and the inner wall of the positioning hole is uniformly provided with positioning grooves along the circumference. The shielding tube is located in the test container and is plugged into the positioning hole, and is stopped and positioned after abutting against the positioning groove.

[0017] As a further solution of the present invention: the temperature sensors on each shielding tube are arranged obliquely, and the oblique direction corresponds to the flow direction of the medium in the test container.

[0018] As a further solution of the present invention: a fixing pin is provided at one end of the shielding tube outside the test container, and the leads of each temperature sensor are locked by the fixing pin and then led outward and connected to a signal acquisition card.

[0019] As a further solution of the present invention: the outer layer of the shielding tube is made of nickel-based alloy, and the inner layer is made of zinc oxide.

[0020] As a further solution of the present invention: the temperature sensor is a thermocouple temperature sensor.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention greatly reduces the influence of magnetoresistance effect or magneto-thermoelectric potential on the data measured by the temperature sensor in a strong magnetic field environment through temperature compensation, so that the measured data is close to the actual data, the test deviation value is low, and the actual cross-sectional temperature of the high-temperature lead-lithium alloy during flow is reflected, thereby improving the measurement accuracy.

[0023] 2. The setting of the threaded thermal sleeve of the present invention can increase the strength of the temperature sensor under the impact of high-speed fluid in the pipeline, improve the service life, reduce fatigue stress by up to 90%, and play a protective effect on the temperature sensor.

[0024] 3. The present invention controls the insertion depth and rotation angle of the shielding tube by means of threaded fixation and positioning holes, thereby changing the measuring point position of the temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a cross-sectional view of the present invention.

[0027] Figure 3 This is a curve verification diagram of the temperature difference measured by the sensor under different working conditions of the present invention.

[0028] In the picture:

[0029] 1. Test container; 11. Positioning hole;

[0030] 2. Shielding tube; 21. Positioning thread; 22. Temperature sensor;

[0031] 23. Threaded thermowell; 24. Positioning nut. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 efforts are within the scope of protection of the present invention.

[0033] See also Figures 1 to 3 In an embodiment of the present invention, a magnetically shielded high-temperature lithium-lead fluid pipeline cross-sectional temperature field measurement system with temperature compensation includes a flat, planar test container 1, on which multiple groups of mounting ports are provided, and multiple groups of parallel, evenly spaced shielding tubes 2 are inserted into the test container 1.

[0034] The channel size of the test container 1 is 280mm×600mm×2400mm, the inlet temperature of the lithium-lead alloy fluid in the test container 1 is 400~700℃, the inlet flow rate of the test container 1 is 1kg / s~32kg / s, the design pressure of the test container 1 is 1MPa, the maximum pressure drop of the test container 1 is 0.6MPa, and the maximum single-side heat flux of the test container 1 is 0.25MW / m 2In this embodiment, the shielding tube 2 is inserted into the test container 1 along the vertical direction, and the medium in the test container 1 flows from bottom to top along the vertical direction.

[0035] Multiple temperature sensors 22 are arranged on a probe inside the shielded tube 2. The measuring end of the sensor 22 passes through the tube body of the shielded tube 2 and is led out into the test cavity of the test container 1. Its surface is coated with a corrosion-resistant and high-temperature resistant coating. The temperature sensor 22 is preferably arranged at an angle, with the tilt direction being the same as the flow direction of the medium inside the test container 1. The signal measured by the temperature sensor 22 is transmitted through the lead wire, thereby realizing cross-sectional matrix temperature measurement. The temperature sensor 22 in this embodiment is preferably a thermocouple type temperature sensor. Thermocouples are low-cost and high-precision in high-temperature measurement. The diameter of the thermocouple wire can be made very thin, which can minimize the diameter of the multi-point sensor when measuring the temperature of the pipeline cross section and reduce the impact on the pipeline flow resistance. Compared with temperature sensors such as platinum resistance, its temperature measurement is relatively less affected by magnetic fields and has high stability. The outer layer of the shielded tube 2 is made of nickel-based alloy, which can withstand temperatures of 1100°C and resist corrosion from high-temperature lithium-lead alloy fluids. The inner layer of the shielded tube 2 is made of zinc oxide, an oxide-based composite material with electromagnetic shielding / wave absorption properties, which can withstand temperatures of 1900°C. The shielding tube 2 is semi-open, and the small opening is at the upper part of the multi-point sensor for leading out the wires.

[0036] The minimum diameter of the metal tube at the measuring end of the temperature sensor 22 is 5 mm in a working environment of 1 MPa, 6 mm in a working environment of 1-3 MPa, and 7 mm in a working environment of 3-10 MPa. In a working environment above 10 MPa, a threaded thermal sleeve 23 needs to be added to the outer ring of the shielding tube 2. In a working environment of 10-16 MPa, the minimum thickness of the threaded thermal sleeve 23 is 9-11 mm. Other situations can be calculated according to actual conditions.

[0037] The spiral-shaped threaded thermowell 23 is designed to strengthen the temperature sensor 22 under high-velocity fluid impact, extending its service life and reducing fatigue stress by up to 90%, effectively protecting the temperature sensor 22. The thread pitch of the threaded thermowell 23 corresponds to the spacing between adjacent temperature sensors 22, and the radial protrusion length of the temperature sensor 22 along the shielded tube 2 corresponds to the wall thickness of the thread of the threaded thermowell 23.

[0038] In order to adjust the rotation angle of the shielding tube 2 in the test container 1, a positioning hole 11 corresponding to the position of the shielding tube 2 is opened in the test container 1, and the inner wall of the positioning hole 11 is evenly provided with positioning grooves along the circumference. The end of the shielding tube 2 corresponds to the positioning groove. The shielding tube 2 is disengaged from the positioning hole 11 and rotated to a set angle, then inserted into the positioning hole 11 and abutted against the positioning groove to stop rotation and position, so as to achieve angle adjustment.

[0039] To adjust the insertion depth of the shielding tube 2 within the test container 1, a positioning thread 21 is provided on the end of the shielding tube 2 that lies outside the test container 1. After adjusting the insertion depth by inserting and removing the shielding tube 2, the shielding tube 2 is secured with a positioning nut 24. The locking surface of the positioning nut 24 is provided with a high-temperature resistant metal sealing gasket. A retaining pin is provided on the end of the shielding tube 2 that lies outside the test container 1. The retaining pin secures the temperature sensor 22 via a corresponding bayonet, enhancing stability under impact from pipeline fluid.

[0040] Under this working condition, the actual temperature T measured by the temperature sensor 22 on each shielding tube 2 is:

[0041]

[0042] Wherein, T0 represents the display temperature of the temperature sensor 22;

[0043] B0 represents the environmental magnetic field value in the test container 1;

[0044] B1 represents the magnetic field value inside the shield tube 2 .

[0045] like Figure 3 As shown, the control variable is the presence or absence of a magnetic field, so as to calculate the temperature difference when the temperature sensor measures under different magnetic field environments. It can be seen that the temperature difference measured by the single thermocouple temperature sensor in the environments of 400, 500, 600, and 700°C is consistent with the temperature difference calculated by the present invention, and the error does not exceed 0.1°C, which verifies the accuracy and reliability of the calculation.

[0046] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0047] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

Claims

1. A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation, characterized in that: The invention comprises at least two groups of shielding tubes (2) inserted into a test container (1), wherein the shielding tubes (2) are arranged parallel to each other and located in the same plane, and temperature sensors (22) are evenly spaced along the length direction of each shielding tube (2); a magnetic field exists in the test container (1), and a detection end of the temperature sensor (22) passes through the shielding tube (2) from the shielding tube (2) and contacts with a medium in the test container (1); the shielding tube (2) is configured to shield the magnetic field in the test container (1); The actual temperature T measured by the temperature sensor (22) on each shielding tube (2) is: Wherein, T0 represents the displayed temperature of the temperature sensor (22); B0 represents the environmental magnetic field value in the test container (1); B1 represents the magnetic field value inside the shielding tube (2).

2. A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation according to claim 1, characterized in that: The shielding tube (2) is coaxially sleeved outside the tube body with a threaded thermal sleeve (23) for reducing the flow resistance of the temperature sensor (22), and the thread pitch of the threaded thermal sleeve (23) corresponds to the spacing between adjacent temperature sensors (22).

3. A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation according to claim 2, characterized in that: The outward protruding length of the temperature sensor (22) along the radial direction of the shielding tube (2) corresponds to the thread wall thickness of the threaded thermal sleeve (23).

4. A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation according to any one of claims 1 to 3, characterized in that: The shielding tube (2) is slidably matched with the test container (1) along its insertion direction and then fixed, and the shielding tube (2) and the test container (1) are rotationally matched.

5. A magnetic shielding high temperature lithium lead fluid pipeline cross section temperature field measurement system with temperature compensation according to claim 4, characterized in that: A positioning thread (21) is coaxially formed at one end of the shielding tube (2) located outside the test container (1). After the shielding tube (2) is slidably matched with the test container (1) along the axial direction, it is locked and fixed by a positioning nut (24) located outside the test container (1). A high-temperature resistant metal sealing gasket is provided on the locking surface of the positioning nut (24).

6. A magnetic shielding high temperature lithium lead fluid pipeline cross section temperature field measurement system with temperature compensation according to claim 4, characterized in that: The test container (1) is provided with a positioning hole (11), and the inner wall of the positioning hole (11) is provided with positioning grooves evenly arranged along the circumferential direction. The shielding tube (2) is located in the test container (1) and is plugged into and matched with the positioning hole (11), and is locked in position after contacting the positioning groove.

7. A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation according to any one of claims 1 to 3, characterized in that: The temperature sensor (22) on each shielding tube (2) is arranged in an inclined manner, and the inclination direction corresponds to the flow direction of the medium in the test container (1).

8. A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation according to any one of claims 1 to 3, characterized in that: A fixing pin is provided at one end of the shielding tube (2) located outside the test container (1); the lead wires of each temperature sensor (22) are locked by the fixing pin and then led outwards and connected to a signal acquisition card.

9. A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation according to any one of claims 1 to 3, characterized in that: The outer layer of the shielding tube (2) is made of a nickel-based alloy material, and the inner layer is made of a zinc oxide material.

10. A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation according to any one of claims 1 to 3, characterized in that: The temperature sensor (22) is a thermocouple type temperature sensor.

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