A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measurement system with temperature compensation

Abstract

The application relates to the field of controllable nuclear fusion devices, and discloses a magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measuring system with temperature compensation, which comprises at least two groups of shielding pipes inserted into a test container, the shielding pipes are arranged in parallel with each other and located in the same plane, and temperature sensors are uniformly and interval arranged on the shielding pipes along the pipe length direction; a magnetic field exists in the test container, the detection end of the temperature sensor is in contact with the medium in the test container after penetrating through the shielding pipe body from the shielding pipe, and the shielding pipe body is configured to shield the magnetic field in the test container. The application can reflect the real cross-section temperature of the high-temperature lead-lithium alloy flow, improves the measuring precision, greatly reduces the influence of the magnetic resistance effect or the magnetic heat electromotive force on the data measured by the temperature sensor in the strong magnetic field environment through temperature compensation, makes the measured data close to the actual data, has a low deviation value in the test, can reflect the real cross-section temperature of the high-temperature lead-lithium alloy flow, and improves the measuring precision.

Description

TECHNICAL FIELD

[0001] The application relates to the field of controllable nuclear fusion devices, in particular to a magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measuring system with temperature compensation. BACKGROUND

[0002] In the field of controllable nuclear fusion, a liquid blanket has the advantages of simple structure, economy, high efficiency and on-line tritium extraction, and is a key component of a controllable nuclear fusion reactor, which adopts lithium-lead alloy as a neutron multiplier, tritium breeder and coolant; since the lithium-lead alloy is an electrically conductive fluid, it will generate a Lorentz force under the action of a strong magnetic field, significantly increasing the flow pressure drop and reducing the power generation efficiency, which is referred to as the MHD effect. In order to study the relationship between the pressure drop, flow rate, temperature and magnetic field of high-temperature lithium-lead alloy flow in a magnetic field environment, the cross-section temperature of the high-temperature lithium-lead alloy flow needs to be measured and the temperature field needs to be analyzed.

[0003] When the temperature field is analyzed, the temperature sensor is in a strong magnetic field environment, and according to the types of the temperature sensor, the temperature data measured by the temperature sensor will deviate from the actual temperature value due to the magnetoresistance effect or the thermoelectric potential, so that the actual cross-section temperature of the high-temperature lithium-lead alloy flow cannot be truly reflected, and the measurement accuracy is affected, and therefore it is urgent to be solved. SUMMARY

[0004] In order to avoid and overcome the technical problems existing in the prior art, the application provides a magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measuring system with temperature compensation. The application can reflect the actual cross-section temperature of the high-temperature lithium-lead alloy flow, and improve the measurement accuracy.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme:

[0006] A magnetic shielding high-temperature lithium-lead fluid pipeline cross-section temperature field measuring system with temperature compensation comprises at least two groups of shielding pipes inserted into a test container, each shielding pipe is arranged in parallel with each other and located in the same plane, and temperature sensors are uniformly and spaced apart along the length direction of each shielding pipe; a magnetic field exists in the test container, the detection end of the temperature sensor is in contact with the medium in the test container after passing through the pipe body of the shielding pipe from the shielding pipe, and the pipe body of the shielding pipe is configured to shield the magnetic field in the test container;

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

[0008]

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

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

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

[0012] As a further scheme of the present application: a threaded heat sleeve pipe is coaxially sleeved outside the tube body of the shielding tube, and the pitch of the threads of the threaded heat sleeve pipe corresponds to the spacing between adjacent temperature sensors.

[0013] As a further scheme of the present application: the radially outward protruding length of the temperature sensor corresponds to the thread wall thickness of the threaded heat sleeve pipe.

[0014] As a further scheme of the present application: the shielding tube is fixed after being slidingly fitted with the test container along the insertion direction of the shielding tube, and the shielding tube and the test container are rotationally fitted.

[0015] As a further scheme of the present application: a positioning thread is coaxially arranged at one end of the shielding tube outside the test container, and the shielding tube is slidingly fitted with the test container along the axial direction, and then locked and fixed by a positioning nut outside the test container, and a high-temperature-resistant metal sealing gasket is arranged on the locking surface of the positioning nut.

[0016] As a further scheme of the present application: the test container is provided with a positioning hole, and a positioning groove is uniformly arranged on the inner wall of the positioning hole in the circumferential direction, the shielding tube is inserted into the test container and rotationally positioned after being abutted with the positioning groove.

[0017] As a further scheme of the present application: the temperature sensors on each shielding tube are arranged in an inclined manner, and the inclined direction corresponds to the flow direction of the medium in the test container.

[0018] As a further scheme of the present application: a fixing pin is arranged at one end of the shielding tube outside the test container, the lead wires of each temperature sensor are locked and then led outwards, and connected to a signal acquisition card.

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

[0020] As a further scheme of the present application: the temperature sensor is a thermocouple type temperature sensor.

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

[0022] 1. The present application greatly reduces the influence of the magnetoresistance effect or the magnetothermal electromotive force on the measured data of the temperature sensor in a strong magnetic field environment through temperature compensation, so that the measured data is close to the actual data, the deviation value of the test is low, the real cross-section temperature during the flow of high-temperature lead-lithium alloy can be reflected, and the measurement precision is improved.

[0023] 2、The threaded hot sleeve pipe is provided, which can increase the strength of the temperature sensor under the impact of high flow rate fluid of the pipe, prolong the service life, reduce the fatigue stress by 90% at most, and has a protection effect on the temperature sensor.

[0024] 3、The threaded fixing and positioning hole positioning are used to control the insertion depth and rotation angle of the shielding pipe, so that the measuring point position of the temperature sensor is changed. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 It is a structural schematic view of the present application.

[0026] Fig. 2 It is a sectional view of the present application.

[0027] Fig. 3 It is a curve verification view of the temperature difference measured by the sensor under different working conditions.

[0028] In the figure:

[0029] 1, test container; 11, positioning hole;

[0030] 2, shielding pipe; 21, positioning thread; 22, temperature sensor;

[0031] 23, threaded hot sleeve pipe; 24, positioning nut. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0033] Please refer to Figs. 1-3 In the embodiments of the present application, a magnetic shielding high-temperature lithium-lead fluid pipe cross-section temperature field measurement system with temperature compensation includes a test container 1 in a flat planar shape, a plurality of installation openings are arranged on the test container 1, and a plurality of parallel and uniformly spaced shielding pipes 2 are inserted into the test container 1.

[0034] The channel size of the test container 1 is 280mmx600mmx2400mm, 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 heat flow of a single side 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] A plurality of temperature sensors 22 are arranged on a probe in the shielding tube 2, the measuring end of the sensor 22 penetrates through the tube body of the shielding tube 2 and is led into the test cavity of the test container 1, and the surface is coated with a corrosion-resistant high-temperature-resistant coating. The temperature sensor 22 is preferably arranged obliquely, and the oblique direction is the same as the flow direction of the medium in the test container 1. The signal measured by the temperature sensor 22 is transmitted out through the lead wire, so as to realize cross-section matrix temperature measurement. The temperature sensor 22 in this embodiment is preferably a thermocouple type temperature sensor. The thermocouple has low cost and high precision in high temperature measurement; the thermocouple wire diameter can be very small, which can minimize the diameter of the multi-point sensor when measuring the pipe cross-section temperature, and reduce the influence on the pipe flow resistance; compared with platinum resistance and other temperature sensors, the temperature measurement is less affected by the magnetic field, and the stability is high. The outer layer of the shielding tube 2 is a nickel-based alloy material, which can withstand high temperature of 1100°C and resist high-temperature lithium-lead alloy fluid corrosion, and the inner layer of the shielding tube 2 is zinc oxide material, which is an oxide-based composite material with electromagnetic shielding / absorbing performance and can withstand high temperature of 1900°C. The shielding tube 2 is semi-open, and the small opening at the upper part of the multi-point sensor is used to lead out the lead wire.

[0036] The metal tube of the measuring end of the temperature sensor 22 has a minimum diameter of 5mm under 1MPa working environment, 6mm under 1-3MPa working environment, 7mm under 3-10MPa working environment, and the outer ring of the shielding tube 2 needs to be provided with a threaded hot sleeve 23 under the working environment higher than 10MPa, and the thickness of the threaded hot sleeve 23 is 9-11mm under the working environment of 10-16MPa, and the thickness can be calculated according to the actual situation under other conditions.

[0037] The threaded hot sleeve 23 is in a spiral shape, which is used to increase the strength of the temperature sensor 22 under the impact of high-flow fluid in the pipeline, improve the service life, and reduce the fatigue stress by 90% at most, so as to protect the temperature sensor 22. The thread pitch of the threaded hot sleeve 23 corresponds to the distance between adjacent temperature sensors 22, and the outer convex length of the temperature sensor 22 in the radial direction of the shielding tube 2 corresponds to the thread wall thickness of the threaded hot sleeve 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 arranged in the test container 1, and a positioning groove is uniformly arranged on the inner wall of the positioning hole 11 in the circumferential direction. The end of the shielding tube 2 corresponds to the positioning groove, the shielding tube 2 is inserted into the positioning hole 11 after being rotated by a set angle and abutting against the positioning groove, and then the rotation is stopped for positioning, so as to realize the adjustment of the angle.

[0039] In order to adjust the insertion depth of the shielding tube 2 in the test container 1, a positioning thread 21 is arranged at one end of the shielding tube 2 outside the test container 1, and after the insertion depth is adjusted by plugging, the shielding tube 2 is locked and fixed by a positioning nut 24, and the locking surface of the positioning nut 24 is provided with a high-temperature-resistant metal sealing gasket. A fixing pin is arranged at one end of the shielding tube 2 outside the test container 1, and the fixing pin is fixed to the temperature sensor 22 through the corresponding card hole, thereby increasing the stability under the impact of the pipeline fluid.

[0040] In 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 in the shielding tube 2.

[0045] As shown in the table, Fig. 3 the control variable is whether there is a magnetic field, so that the temperature difference measured by the temperature sensor under different magnetic field environments is calculated, and it can be seen that the temperature difference measured by a single thermocouple temperature sensor in the 400, 500, 600 and 700℃ environments is relatively consistent with the calculated temperature difference, and the error is not more than 0.1℃, which verifies the accuracy and reliability of the calculation.

[0046] The basic principles of the present application are described above in combination with specific embodiments, but it should be pointed out that the advantages, advantages, effects and the like mentioned in the present application are only examples and not limitations, and these advantages, advantages, effects and the like cannot be considered as the necessary possession of each embodiment of the present application. In addition, the above-mentioned specific details are only for the purpose of example and for the purpose of understanding, and are not limited to the above-mentioned specific details.

[0047] The block diagram of the device, apparatus, equipment, system involved in the present application is only an illustrative example and is not intended to require or imply that the connection, arrangement and configuration shown in the block diagram must be connected, arranged and configured. As those skilled in the art will recognize, these devices, apparatus, equipment, system can be connected, arranged and configured in any way. Words such as "include", "contain", "have" and the like are open-ended words, which mean "include but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

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 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 body of the shielding tube (2) from inside the shielding tube (2) and contacts the medium in the test container (1); the body of 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 display 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 protrusion 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 fitted with the test container (1) along its insertion direction and then fixed, and the shielding tube (2) and the test container (1) are rotationally fitted.

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 provided on one end of the shielding tube (2) located outside the test container (1). After the shielding tube (2) is axially slidably engaged with the test container (1), 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 distributed along the circumference. The shielding tube (2) is located in the test container (1) and is plugged into 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 at an angle, and the direction of the angle 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) outside the test container (1); the leads 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 nickel-based alloy material, and the inner layer is made of 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.

Images