Temperature measuring device for measuring temperature of center of lead bismuth alloy heating section pipeline and measuring method thereof

Abstract

The invention discloses a temperature measuring device for measuring the center temperature of a lead bismuth alloy heating section pipeline. The temperature measuring device comprises a supporting pipe, a thermocouple and a guide rod, the supporting pipe penetrates through the interior of the heating section pipeline body in the radial direction, a first through hole and a second through hole are formed in the connecting positions of the supporting pipe and the pipe walls of the left side and the right side of the pipeline body, and a detection window is formed in the middle of the supporting pipe. The thermocouple and the guide rod are in sealed connection with the pipeline body, one end of the thermocouple is provided with a detection portion and a bending portion, one end of the guide rod is provided with a guide face, the end, provided with the detection portion, of the thermocouple extends into the supporting pipe from the first through hole, the end, provided with the guide face, of the guide rod extends into the supporting pipe from the second through hole, and the guide face abuts against the bending portion. And the bending part is formed, so that the detection part extends out of the detection window. The temperature measuring device is convenient to install, high in measuring precision, resistant to high temperature and corrosion and suitable for the working environment of the liquid lead bismuth alloy.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature measurement, and in particular to a temperature measuring device and a measuring method thereof for measuring the central temperature of a lead-bismuth alloy heating section pipeline. Background Art

[0002] Lead-bismuth stacks have significant characteristics such as high inherent safety, miniaturization, and broad application prospects. They are an important research direction for advanced nuclear energy systems. Liquid lead-bismuth alloys are widely used in nuclear energy, thermal engineering and other fields due to their excellent thermal conductivity and radiation resistance. Compared with conventional liquids such as water, liquid lead-bismuth alloys have unique thermophysical properties such as low Prandtl number, high thermal conductivity, large density, viscosity and thermal expansion coefficient. They exhibit unique thermal hydraulic characteristics during the natural circulation process, which are significantly different from the natural circulation of water in terms of flow heat transfer and system thermal hydraulic characteristics. At the same time, they are also different from liquid sodium coolants in circulation flow. Therefore, when measuring the temperature field inside the pipeline, it is necessary to accurately locate the center of the pipeline. However, the measurement equipment used in the prior art is difficult to meet the measurement requirements in high-temperature liquid metal environments due to problems such as complex structure, inconvenient operation and insufficient accuracy.

[0003] Therefore, there is an urgent need for a center measurement method with simple design and high accuracy. Summary of the invention

[0004] The main purpose of the present invention is to propose a temperature measuring device for the central temperature of a lead-bismuth alloy heating section pipeline, which is easy to install, has high measurement accuracy, is resistant to high temperature and corrosion, and is suitable for the working environment of liquid lead-bismuth alloy.

[0005] To achieve the above-mentioned purpose, the present invention proposes a temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline, comprising a support tube, a thermocouple and a guide rod; the support tube is radially arranged inside the heating section pipeline body, a first through hole and a second through hole are arranged at the connection between the support tube and the left and right sides of the pipeline body, and a detection window is opened in the middle of the support tube; the thermocouple and the guide rod are respectively sealed and connected to the pipeline body; a detection part and a bending part are arranged at one end of the thermocouple, and a guide surface is arranged at one end of the guide rod. The end of the thermocouple provided with the detection part extends into the support tube through the first through hole, and the end of the guide rod provided with the guide surface extends into the support tube through the second through hole, and the guide surface abuts against the bending part, and the guide surface is used to form the bending part so that the detection part extends out of the detection window.

[0006] The present invention radially arranges a support tube inside the main body of the heating section pipeline, so that the thermocouple penetrates into the main body of the pipeline through the support tube, and controls the thermocouple detection part to extend out of the detection window of the support tube to contact the liquid metal through the guide rod, thereby accurately controlling the detection position to be located at the center of the pipeline body, and avoiding the deviation of the temperature measuring element caused by the action of the liquid metal fluid, thereby achieving higher measurement accuracy.

[0007] Preferably, the temperature measuring device further comprises a first mounting assembly and a second mounting assembly;

[0008] The first mounting assembly includes a first tube seat, a first clamping nut and a first clamping core, one end of the first tube seat is fixedly connected to the left end of the support tube, the other end of the first tube seat is threadedly connected to the first clamping nut, and the first clamping core is arranged in the first clamping nut;

[0009] The second mounting assembly comprises a second tube seat, a second clamping nut and a second clamping core, one end of the second tube seat is fixedly connected to the right end of the support tube, the other end of the second tube seat is threadedly connected to the second clamping nut, and the second clamping core is arranged in the second clamping nut;

[0010] The end of the thermocouple provided with the detection part is inserted through the first installation component and extends into the support tube through the first through hole; the end of the guide rod provided with the guide surface is inserted through the second installation component and extends into the support tube through the second through hole.

[0011] The first mounting assembly and the second mounting assembly are provided to facilitate the thermocouple and the guide rod to extend directly from the outside of the heating copper plate through the first mounting assembly and the second mounting assembly into the pipeline body, making the operation more convenient. The sealing and fixing are achieved by the cooperation of the compression nut and the card core.

[0012] Preferably, the first clamp and the second clamp are made of copper. Copper has the ability to deform, and can be used with a clamping nut to clamp the thermocouple and the guide rod by deformation to achieve sealing and fixing. Copper is also resistant to high temperature and corrosion, and is suitable for the working environment of liquid lead-bismuth alloy.

[0013] Preferably, the first tube seat includes a first thin tube seat and a first thick tube seat connected by threads, the first thin tube seat is fixedly connected to the left end of the support tube, the first thick tube seat is threadedly connected to the first clamping nut, and the diameter of the first thin tube seat is smaller than the diameter of the first thick tube seat.

[0014] The second tube seat includes a second thin tube seat and a second thick tube seat connected by threads, the second thin tube seat is fixedly connected to the left end of the support tube, the second thick tube seat is threadedly connected to the second clamping nut, and the diameter of the second thin tube seat is smaller than the diameter of the second thick tube seat.

[0015] Usually, to measure the temperature inside the pipeline of the liquid lead-bismuth alloy heating section, it is necessary to drill a hole in the heating copper plate wrapped around the pipeline. The thickness of the copper plate is usually more than 50 cm. The larger the diameter of the hole, the more uneven the heating surface of the pipeline body and the more difficult it is to drill the hole. Therefore, it is necessary to minimize the diameter of the hole. Therefore, a combination of a thin tube seat and a thick tube seat is adopted. The thin tube seat is placed in the copper plate, and the thick tube seat is connected with the tightening nut. The assembly cost can be reduced through simple assembly.

[0016] Preferably, the length of the detection window along the axial direction of the support tube is 58 mm. The size of the detection window is adjusted so that the detection part of the thermocouple can be easily extended out of the detection window by bending.

[0017] Preferably, the detection window faces the liquid inlet side of the pipeline body, and the axis of the pipeline body passes through the detection window, so that the detection window is located at the center of the pipeline body, and the thermocouple is in direct contact with the liquid lead-bismuth alloy after extending out of the detection window, so that the detection is more accurate.

[0018] Preferably, the length of the thermocouple extending into the support tube is 115 mm to 130 mm; the length of the guide rod extending into the support tube is 115 mm to 130 mm. By adjusting the length of the thermocouple and the guide rod, the detection section of the thermocouple extends from the detection window of the support tube through the guide surface of the guide rod, so as to facilitate contact with the liquid lead-bismuth alloy for temperature detection.

[0019] On the other hand, the present invention also provides a method for measuring the central temperature of a lead-bismuth alloy heating section pipeline, comprising the following steps:

[0020] S1. Install the support pipe radially through the interior of the heating section pipeline body;

[0021] S2, installing the first installation assembly and the second installation assembly at both ends of the support pipe respectively, and welding and sealing them with the pipe body;

[0022] S3, inserting the thermocouple into the first mounting assembly and extending it into the support tube through the first through hole, and adjusting the length and position of the thermocouple to ensure that its detection part is located at the center of the pipeline body;

[0023] S4, inserting the guide rod into the second mounting assembly and extending it into the support tube through the second through hole, adjusting the length of the guide rod so that one end of the thermocouple located in the support tube is bent along the guide surface to form a bent portion, so that the detection portion extends out of the detection window;

[0024] S5, tighten the first clamping nut and the second clamping nut, squeeze and deform the first clamping core and the second clamping core to respectively fix the positions of the thermocouple and the guide rod to complete the positioning and sealing.

[0025] The method described in the present invention is simple to operate and convenient to install, and can accurately position the temperature measuring section of the thermocouple at the center of the lead-bismuth alloy heating section pipeline without being offset by the impact of the liquid lead-bismuth alloy, and has high measurement accuracy; the material is resistant to high temperature and corrosion, and is suitable for the working environment of the liquid lead-bismuth alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the structure of the temperature measuring device in the embodiment when it is in the temperature measuring state;

[0028] Figure 2 is a schematic diagram of the structure of the first installation component and the second installation component in the embodiment;

[0029] Figure 3 It is a schematic diagram of the structure when the thermocouple is inserted after the first mounting assembly is connected to the support tube in the embodiment.

[0030] In the accompanying drawings: 1-pipe body, 2-support tube, 21-first through hole, 22-second through hole, 23-detection window, 3-thermocouple, 31-detection part, 32-bending part, 4-guide rod, 41-guide surface, 5-first mounting assembly, 51-first tube seat, 511-first thin tube seat, 512-first thick tube seat, 52-first tightening nut, 53-first clamping core, 6-second mounting assembly, 61-second tube seat, 611-second thin tube seat, 612-second thick tube seat, 62-second tightening nut, 63-second clamping core.

[0031] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

[0033] It should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In addition, the term "include" and any variation thereof all mean "at least include".

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0036] Example

[0037] Reference Figures 1 to 3The present invention provides a temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline, comprising a support tube 2, a thermocouple 3 and a guide rod 4. The support tube 2 is radially arranged to penetrate the interior of the heating section pipeline body 1, and a first through hole 21 and a second through hole 22 are provided at the connection between the support tube 2 and the left and right sides of the pipeline body 1, and a detection window 23 is provided in the middle of the support tube 2. In practical applications, the support tube 2 can be pre-set in the pipeline body 1, or it can be installed later, that is, after drilling holes on both sides of the pipeline body 1, the support tube 2 is inserted into the pipeline body 1. The thermocouple 3 and the guide rod 4 are respectively sealed and connected to the pipeline body 1, and one end of the thermocouple 3 is provided with a detection part 31 and a bending part 32, and one end of the guide rod 4 is provided with a guide surface 41, and the guide surface 41 is an inclined inclined surface. In practical applications, the surface of the inclined surface can be a plane or a concave arc surface. In some embodiments, one end of the thermocouple 3 having a detection portion 31 is inserted into the support tube 2 through the first through hole 21, and one end of the guide rod 4 having a guide surface 41 is inserted into the support tube 2 through the second through hole 22. The lengths of the thermocouple 3 and the guide rod 4 are adjusted so that the two are in contact at the detection window 23. The detection portion 31 of the thermocouple 3 is offset in path through the guide surface 41, so that a bending portion 32 is formed at the end of the thermocouple 3, and the bending portion 32 finally abuts against the guide surface 41, and the detection portion 31 extends out of the detection window 23. When the thermocouple 3 and the guide rod 4 are inserted into the support tube 2 and finally the detection portion 31 extends out of the detection window 23, a known sealing method such as welding sealing can be used to seal the thermocouple 3 and the guide rod 4 at the first through hole 21 and the second through hole 22.

[0038] In the prior art, because the liquid lead-bismuth alloy has flow heat transfer and system thermal hydraulic characteristics different from those of conventional water circulation, when measuring the temperature field inside the pipeline, it is necessary to accurately locate the center of the pipeline, and the liquid lead-bismuth alloy has a large density, and the impact force on the thermocouple 3 during the flow is strong, which can easily cause the thermocouple 3 to produce position displacement, and the difficulty of high-precision measurement is greatly increased. At the same time, the high-temperature and corrosion resistance standards of the material in the high-temperature liquid metal environment are high, and the measurement requirements are difficult to meet. The traditional measurement equipment has a complex structure, inconvenient operation, and insufficient accuracy. The present invention arranges a radial support tube 2 in the pipeline body 1, places the thermocouple 3 in the support tube 2, opens a detection window 23 on the support tube 2, and uses a guide rod 4 to make the temperature measurement section of the thermocouple 3 extend out of the detection window 23, so as to achieve accurate positioning, and avoid the impact of the liquid lead-bismuth alloy flow on the measurement position of the thermocouple 3, improve the detection accuracy, and the whole set of temperature measurement device is simple in design and easy to operate.

[0039] In this embodiment, Figure 1 and Figure 2As shown, the temperature measuring device also includes a first mounting component 5 and a second mounting component 6. The first mounting component 5 includes a first tube seat 51, a first clamping nut 52 and a first clamping core 53. One end of the first tube seat 51 is fixedly connected to the left end of the support tube 2, and the other end of the first tube seat 51 is threadedly connected to the first clamping nut 52, and the first clamping core 53 is arranged in the first clamping nut 52; the second mounting component 6 includes a second tube seat 61, a second clamping nut 62 and a second clamping core 63. One end of the second tube seat 61 is fixedly connected to the right end of the support tube 2, and the other end of the second tube seat 61 is threadedly connected to the second clamping nut 62, and the second clamping core 63 is arranged in the second clamping nut 62. One end of the thermocouple 3 having a detection part 31 is inserted into the first mounting assembly 5 and extends into the support tube 2 through the first through hole 21. One end of the guide rod 4 having a guide surface 41 is inserted into the second mounting assembly 6 and extends into the support tube 2 through the second through hole 22. The lengths of the thermocouple 3 and the guide rod 4 are adjusted so that the two contact at the detection window 23. The detection part 31 of the thermocouple 3 is offset through the guide surface 41, so that a bending part 32 is formed at the end of the thermocouple 3. The bending part 32 finally abuts against the guide surface 41, and the detection part 31 extends out of the detection window 23. When the thermocouple 3 and the guide rod 4 are inserted into the support tube 2 and the detection part 31 finally extends out of the detection window 23, the first clamping nut 52 and the second clamping nut 62 are tightened. Since the first clamping core 53 and the second clamping core 63 are made of copper, the thermocouple 3 and the guide rod 4 are fixed and sealed through extrusion deformation. Since the periphery of the liquid lead-bismuth alloy heating section pipeline body 1 is usually wrapped with a thick copper plate for heating, the first mounting component 5 and the second mounting component 6 are used to pass through the copper plate to connect with the pipeline body 1, so that the thermocouple 3 and the guide rod 4 can more easily enter the pipeline body 1.

[0040] In order to minimize the size of the hole opening on the copper plate, in this embodiment, Figure 2 and Figure 3 As shown, the first tube seat 51 includes a first thin tube seat 511 and a first thick tube seat 512 connected by threads, the first thin tube seat 511 is fixedly connected to the left end of the support tube 2, the first thick tube seat 512 is threadedly connected to the first clamping nut 52, and the diameter of the first thin tube seat 511 is smaller than the diameter of the first thick tube seat 512. The second tube seat 61 includes a second thin tube seat 611 and a second thick tube seat 612 connected by threads, the second thin tube seat 611 is fixedly connected to the right end of the support tube 2, the second thick tube seat 612 is threadedly connected to the second clamping nut 62, and the diameter of the second thin tube seat 611 is smaller than the diameter of the second thick tube seat 612. By combining the thin tube seat and the thick tube seat, the thin tube seat is buried in the copper plate, which can reduce the difficulty of opening the copper plate and reduce the cost. At the same time, the thick tube seat is used as a connection to perfectly match the aperture of the clamping nut. The thin tube seat, the thick tube seat and the clamping nut are all made of 316 stainless steel, which is resistant to high temperature and corrosion.

[0041] In this embodiment, the length of the detection window 23 along the axial direction of the support tube 2 is 58 mm. The size of the detection window 23 is adjusted so that the detection portion 31 of the thermocouple 3 can be easily extended out of the detection window 23 after being bent. The length of the thermocouple 3 extending into the support tube 2 is 115 mm to 130 mm, and the length of the guide rod 4 extending into the support tube 2 is 115 mm to 130 mm. The lengths of the thermocouple 3 and the guide rod 4 are adjusted so that the thermocouple 3 contacts the guide rod 4 at the detection window 23, and the detection section of the thermocouple 3 extends out of the detection window 23 after being bent by the guide surface 41, so as to be conveniently in contact with the liquid lead-bismuth alloy and positioned in the center of the pipeline for temperature detection.

[0042] Using the above-mentioned temperature measuring device, the present invention provides a method for measuring the central temperature of a lead-bismuth alloy heating section pipeline, comprising the following steps:

[0043] S1, radially penetrate and install the support pipe 2 inside the heating section pipeline body 1;

[0044] S2, installing the first installation component 5 and the second installation component 6 at both ends of the support pipe 2 respectively, and welding and sealing with the pipeline body 1;

[0045] S3, insert the thermocouple 3 into the first mounting assembly 5, and extend it into the support tube 2 through the first through hole 21, and adjust the length and position of the thermocouple 3 to ensure that its detection part 31 is located at the center of the pipeline body 1;

[0046] S4, insert the guide rod 4 into the second mounting assembly 6, and extend it into the support tube 2 through the second through hole 22, and adjust the length of the guide rod 4 so that the end of the thermocouple 3 located in the support tube 2 is bent along the guide surface 41 to form a bending portion 32, so that the detection portion 31 extends out of the detection window 23;

[0047] S5, tighten the first clamping nut 52 and the second clamping nut 62, squeeze and deform the first clamping core 53 and the second clamping core 63 to respectively fix the positions of the thermocouple 3 and the guide rod 4 to complete the positioning and sealing.

[0048] According to the temperature measuring device and the measuring method provided in this embodiment, the length of the thermocouple 3 extending into the support tube 2 is adjusted to 123 mm, the length of the guide rod 4 extending into the support tube 2 is adjusted to 119 mm, the copper plate is controlled to heat, and the central temperature of the liquid lead-bismuth alloy heating section pipeline body 1 is measured under different heating powers. Due to the characteristics of the liquid lead-bismuth alloy itself, a constant heat flow and a constant cold source are maintained in the closed pipeline loop, and a stable temperature distribution is finally formed in the loop, and a stable temperature stratification is formed in the heating pipeline. In order to verify the measurement accuracy of the measurement method of the present invention, the measurement is also performed. The temperature at the same cross section of the pipeline body 1 at a distance of 1 mm from the pipeline wall can also be measured by inserting a thermocouple in a known manner. Since only the temperature at a distance of 1 mm from the pipeline wall needs to be measured, a hole can be directly punched on the pipeline wall to control the length of the inserted thermocouple, or other known measurement methods can be used. The punching position can be any other position of the same cross section of the pipeline body 1 where the first through hole 21 and the second through hole 22 are located. In this embodiment, the line connecting the punching position at the temperature of 1 mm from the pipeline wall and the center of the pipeline is perpendicular to the line connecting the first through hole 21 and the second through hole 22. The data obtained by measuring the center temperature of the pipeline and the temperature at 1 mm from the pipeline wall at different heating powers are compared with the temperature of the CFD simulation data, and the results are shown in Table 1.

[0049] Table 1

[0050]

[0051] It can be seen that by adopting the temperature measuring device and the measuring method described in the present invention, the error range of the measured pipeline center temperature and the CFD simulation data under different heating powers is 1.8-3.1%, and the error range of the temperature difference between the pipeline center and the point 1 mm away from the pipeline wall and the CFD simulation data fluctuates within 3%, with high measurement accuracy and precise positioning.

[0052] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline, characterized in that: The invention comprises a support tube (2), a thermocouple (3) and a guide rod (4); the support tube (2) is radially arranged to penetrate the interior of a heating section pipeline body (1); a first through hole (21) and a second through hole (22) are provided at the connection between the support tube (2) and the left and right pipe walls of the pipeline body (1); a detection window (23) is provided in the middle of the support tube (2); the thermocouple (3) and the guide rod (4) are respectively sealed and connected to the pipeline body (1); one end of the thermocouple (3) is provided with a detection portion (31) and a bending portion (32); A guide surface (41) is provided at one end of the guide rod (4); one end of the thermocouple (3) provided with the detection portion (31) extends into the support tube (2) through the first through hole (21); one end of the guide rod (4) provided with the guide surface (41) extends into the support tube (2) through the second through hole (22); the guide surface (41) abuts against the bending portion (32); the guide surface (41) is used to form the bending portion (32) so that the detection portion (31) extends out of the detection window (23).

2. A temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline according to claim 1, characterized in that: It also includes a first mounting assembly (5) and a second mounting assembly (6); The first mounting assembly (5) comprises a first tube seat (51), a first clamping nut (52) and a first clamping core (53); one end of the first tube seat (51) is fixedly connected to the left end of the support tube (2); the other end of the first tube seat (51) is threadedly connected to the first clamping nut (52); and the first clamping core (53) is arranged in the first clamping nut (52); The second mounting assembly (6) comprises a second tube seat (61), a second clamping nut (62) and a second clamping core (63); one end of the second tube seat (61) is fixedly connected to the right end of the support tube (2); the other end of the second tube seat (61) is threadedly connected to the second clamping nut (62); and the second clamping core (63) is arranged in the second clamping nut (62); One end of the thermocouple (3) provided with the detection portion (31) is inserted through the first mounting assembly (5) and extends into the support tube (2) through the first through hole (21); and one end of the guide rod (4) provided with the guide surface (41) is inserted through the second mounting assembly (6) and extends into the support tube (2) through the second through hole (22).

3. A temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline according to claim 2, characterized in that: The first card core (53) and the second card core (63) are made of red copper.

4. A temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline according to claim 2, characterized in that: The first tube seat (51) comprises a first thin tube seat (511) and a first thick tube seat (512) connected by threads, the first thin tube seat (511) is fixedly connected to the left end of the support tube (2), the first thick tube seat (512) is threadedly connected to the first clamping nut (52), and the diameter of the first thin tube seat (511) is smaller than the diameter of the first thick tube seat (512).

5. A temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline according to claim 2, characterized in that: The second tube seat (61) comprises a second thin tube seat (611) and a second thick tube seat (612) which are connected by threads, the second thin tube seat (611) is fixedly connected to the left end of the support tube (2), the second thick tube seat (612) is threadedly connected to the second clamping nut (62), and the diameter of the second thin tube seat (611) is smaller than the diameter of the second thick tube seat (612).

6. A temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline according to claim 1, characterized in that: The length of the detection window (23) along the axial direction of the support tube (2) is 58 mm.

7. A temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline according to claim 1, characterized in that: The detection window (23) faces the liquid inlet side of the pipeline body (1), and the axis of the pipeline body (1) passes through the detection window (23).

8. A temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline according to claim 1, characterized in that: The length of the thermocouple (3) extending into the support tube (2) is 115 mm to 130 mm; the length of the guide rod (4) extending into the support tube (2) is 115 mm to 130 mm.

9. A method for measuring the central temperature of a lead-bismuth alloy heating section pipeline, characterized in that: Using a temperature measuring device for measuring the central temperature of a lead-bismuth alloy heating section pipeline as described in any one of claims 2 to 8, the measuring steps include: S1, installing the support pipe (2) radially through the interior of the heating section pipeline body (1); S2, installing the first installation component (5) and the second installation component (6) at the two ends of the support pipe (2) respectively, and welding and sealing them with the pipeline body (1); S3, inserting the thermocouple (3) into the first mounting assembly (5), and extending the thermocouple (3) into the support tube (2) through the first through hole (21), and adjusting the length and position of the thermocouple (3) to ensure that the detection portion (31) thereof is located at the center of the pipeline body (1); S4, inserting the guide rod (4) into the second mounting assembly (6), and extending the guide rod (4) into the support tube (2) through the second through hole (22), adjusting the length of the guide rod (4) so ​​that one end of the thermocouple (3) located in the support tube (2) is bent along the guide surface (41) to form a bent portion (32), thereby allowing the detection portion (31) to extend out of the detection window (23); S5, tightening the first clamping nut (52) and the second clamping nut (62), squeezing and deforming the first clamping core (53) and the second clamping core (63) to respectively fix the positions of the thermocouple (3) and the guide rod (4) to complete positioning and sealing.

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