Shell-and-tube C-shaped tube bundle heat exchanger simulator and installation method

Abstract

The invention discloses a tube-shell type C-shaped tube bundle heat exchanger simulator and an installation method, and the method achieves the refined measurement of a temperature field of a heat transfer tube bundle region through the arrangement of a thermocouple and a temperature measurement assembly, and the matched installation of the thermocouple and each layer of filling block, and can achieve the refined measurement of the wall temperature of a heat transfer tube. Especially, refined measurement of the wall temperatures of heat transfer tubes in different areas of the C-shaped tube bundle heat exchanger with multiple layers of cylinders and built-in components can be realized, and firmer test data support is provided for performance research, structure optimization and calculation program verification of the heat exchanger.

Description

Technical Field

[0001] The invention relates to the technical field of power system test research equipment, and in particular to a shell and tube type C-shaped tube bundle heat exchanger simulation body and an installation method thereof. Background Art

[0002] In the power system, the shell and tube C-type tube bundle heat exchanger is a new type of high-efficiency heat exchange equipment. The C-shaped tube bundle structure can effectively suppress the local backflow phenomenon of the U-shaped tube bundle heat exchanger under low-load conditions, and can improve the heat exchange efficiency of the heat exchanger. According to the needs of the project, in order to optimize the flow distribution of the secondary side working fluid in the tube bundle area, an inner shroud is usually set inside the C-type tube bundle heat exchanger, and an annular channel is formed between the inner shroud and the pressure shell. The secondary side working fluid is distributed in the tube bundle area through the diversion holes at the bottom of the shroud.

[0003] According to the simulation criteria, a filling block must be set in the cylinder of the test simulation body to achieve accurate simulation of the secondary water volume and the flow area of ​​the annular channel. In the scaled simulation body test of the C-type tube bundle heat exchanger, in order to obtain the flow and heat transfer characteristics of the C-type tube bundle area and improve the refinement of the test, it is necessary to measure the wall temperature of the heat transfer tubes in different areas. The working conditions of the C-type tube bundle heat exchanger are generally high temperature and high pressure. After actual testing of various wall temperature measuring instruments, thermocouples are still the most reliable wall temperature measuring instruments. However, for this shell and tube C-type tube bundle heat exchanger simulation body with an inner circumference and built-in filling blocks, the prior art generally fastens the thermocouple to the heat conduction plate, and the heat conduction plate is fixed to the tube wall by welding or clamps, or the thermocouple is installed in a fixed position, so that the refined measurement of the heat transfer tube wall temperature cannot be achieved. Summary of the invention

[0004] The present invention provides a shell and tube C-shaped tube bundle heat exchanger simulation body and an installation method, which can realize a thermocouple installation process in which a wall temperature thermocouple penetrates a multi-layer structural member and can realize the sealing of an inner shroud, and realize the measurement of the heat transfer tube wall temperature of a shell and tube C-shaped tube bundle heat exchanger simulation body with an inner shroud and a built-in filling block, thereby providing technical support for refined experiments.

[0005] The present invention provides a shell and tube type C-shaped tube bundle heat exchanger simulation body, the simulation body comprises a pressure vessel, a C-shaped tube bundle, a plurality of filling blocks and an inner shroud, the heat transfer tube, the C-shaped tube bundle, the plurality of filling blocks and the inner shroud are arranged in the pressure vessel; the pressure vessel is provided with a temperature measuring hole, the thermocouple is connected to the heat transfer tube of the C-shaped tube bundle, and is connected to a temperature measuring component via the temperature measuring hole;

[0006] The multiple filling blocks are distributed in multiple layers in the pressure container, and the number of filling blocks in each layer is two or more; the thermocouple passes through the gaps between the filling blocks in each layer and exits from the temperature measuring holes of the pressure container arranged at the corresponding positions of each gap.

[0007] Optionally, a movable protective sleeve is provided on the outside of the thermocouple, and the protective sleeve can slide on the outside of the thermocouple;

[0008] The aperture of the protective sleeve is larger than the diameter of the thermocouple, and the outer diameter of the protective sleeve is not larger than the end diameter of the thermocouple.

[0009] Optionally, the length of the protective sleeve is 10 mm to 30 mm;

[0010] The difference between the inner diameter of the protective sleeve and the outer diameter of the thermocouple is less than or equal to 0.1 mm.

[0011] Optionally, the inner shroud is disposed between the pressure vessel and the C-type tube bundle, and is disposed close to the C-type tube bundle;

[0012] The inner shell is provided with an opening, so that the thermocouple passes through the inner shell via the opening and is connected to the heat transfer tube of the C-type tube bundle.

[0013] Optionally, the protective sleeve is inserted into the opening of the inner shell, and the protective sleeve and the inner shell are sealed and welded by silver brazing.

[0014] Optionally, the connection between the thermocouple and the heat transfer tube is sealed by silver brazing.

[0015] The present invention also provides a method for installing a thermocouple for measuring the wall temperature of a heat transfer tube of a shell and tube C-shaped tube bundle heat exchanger, the method comprising:

[0016] Determine the inner diameter and outer diameter of the movable sleeve according to the outer diameter of the thermocouple and the outer diameter of the sealing sleeve of the terminal;

[0017] Put the movable sleeve on the thermocouple, and then silver braze the thermocouple on the heat transfer tube of the C-type tube bundle;

[0018] Pass the thermocouple through the opening of the inner shell, slide the movable sleeve to the opening of the inner shell, and seal and weld the movable sleeve to the inner shell;

[0019] Perform sealing welding on the outer end of the thermocouple and the movable sleeve to achieve sealing between the thermocouple and the movable sleeve;

[0020] The filling blocks are installed layer by layer in the pressure vessel.

[0021] Optionally, when installing filling blocks layer by layer in a pressure container, install the lower filling blocks first, then lay the thermocouples on the filling blocks of this layer, and transmit them from the corresponding temperature measuring openings of the pressure container, and then install the upper filling blocks. Support blocks are set between the two layers of filling blocks so that a certain gap is retained between the two layers of filling blocks.

[0022] The shell and tube C-tube bundle heat exchanger simulation body provided by the present invention realizes the refined measurement of the tube bundle area parameters of the shell and tube C-tube bundle heat exchanger test simulation body with an inner shroud and a built-in filling block, and provides sufficient data support for the optimization of the shell and tube C-tube bundle heat exchanger structure.

[0023] The thermocouple of the present invention is not provided with a permanent protective sleeve, but a movable sleeve with a length of 10 mm to 30 mm. The sleeve aperture is slightly larger than the thermocouple diameter, and the outer diameter of the protective sleeve is not larger than the diameter of the end of the thermocouple. The protective sleeve can slide along the thermocouple to change its position according to the installation needs of the thermocouple, and can pass through the opening of the inner shell. The thermocouple adopts a movable sleeve to achieve welding with the inner shell, and protects the thermocouple during welding. Before the thermocouple is welded to the heat transfer tube, the movable sleeve is firstly sleeved on the thermocouple. After the welding of the thermocouple and the heat transfer tube is completed, the inner shell is installed. The movable sleeve and the inner shell are sealed by silver brazing, and the thermocouple and the end of the movable sleeve are sealed by silver brazing. The thermocouple is laid in the gap between each layer of filling blocks, and then the pressure vessel is transmitted out of the pressure vessel from the temperature measuring hole of the pressure vessel, so as to realize the multi-layer penetration of the inner shell, the filling block and the pressure vessel.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a general structural diagram of a test simulation body of a shell and tube type C-type tube bundle heat exchanger with an inner shroud and built-in filling blocks according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 BB cross section diagram, where the oval area is the wall temperature thermocouple installation diagram;

[0028] Figure 3 for Figure 1 AA cross section diagram;

[0029] Figure 4 This is a schematic diagram of the installation of a wall temperature thermocouple according to an embodiment of the present invention. The thermocouple for measuring the wall temperature of the heat transfer tube passes through the inner enclosure, the gap between the filling blocks, and the cylinder of the pressure container in sequence;

[0030] Figure 5 This is a schematic diagram of a sealing installation structure of a wall temperature thermocouple penetrating an inner shroud according to an embodiment of the present invention;

[0031] Figure 6The schematic diagram of the installation of the thermocouple and the movable sleeve of the embodiment of the present invention; the movable sleeve can be changed on the thermocouple according to the actual installation situation, so as to facilitate the sealing welding of the protective sleeve and the inner casing after the thermocouple and the heat transfer tube are welded;

[0032] Among them, 10-pressure vessel, 11-primary side inlet head, 12-primary side outlet head, 13-secondary side inlet, 14-secondary side outlet, 20-C-type tube bundle, 21-heat transfer tube, 30-filling block, 31-gap between filling block layers, 40-inner enclosure, 50-thermocouple, 51-protective sleeve, 52-gap between movable sleeve and thermocouple, 53-terminal sealing sleeve, 54-lead, 60-descending annular channel top plate, 70-flow distribution hole, 80-temperature measuring component, 91-heat transfer tube sealing silver brazing, 92-thermocouple sealing silver brazing, 93-inner enclosure sealing silver brazing. DETAILED DESCRIPTION

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection 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.

[0036] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0037] The present invention provides a shell and tube type C-shaped tube bundle heat exchanger simulation body with an inner shroud and a built-in filling block, such as Figure 1 to Figure 3 As shown, the shell and tube C-type tube bundle heat exchanger simulation body of this embodiment includes a pressure vessel 10, a C-type tube bundle 20, a plurality of filling blocks 30 and an inner shroud 40, and the heat transfer tube 21, the C-type tube bundle 20, the plurality of filling blocks 30 and the inner shroud 40 are arranged in the pressure vessel 10; the pressure vessel 10 is provided with a temperature measuring hole, the thermocouple 50 is connected to the heat transfer tube 21 of the C-type tube bundle 20, and is connected to the temperature measuring component 80 via the temperature measuring hole, and then the temperature of the heat exchanger is detected by using the temperature measuring component 80.

[0038] See also Figure 2 , multiple filling blocks 30 are distributed in multiple layers from top to bottom in the pressure container 10, and the number of filling blocks 30 in each layer is two or more; the thermocouple 50 passes through the gaps between the filling blocks 30 of each layer, and passes out from the temperature measuring holes of the pressure container 10 arranged at the corresponding positions of each gap. Figure 2 The oval area and Figure 4 The figure is a schematic diagram of the installation of the wall temperature thermocouple 50. The thermocouple 50 for measuring the wall temperature of the heat transfer tube 21 sequentially passes through the inner shroud 40, the gap 31 between the filling blocks, and the cylinder of the pressure vessel 10. In this embodiment, the movable sleeve and the inner shroud 40 are sealed by silver brazing, and the thermocouple 50 and the end of the movable sleeve are sealed by silver brazing; the thermocouple 50 is laid in the gap between each layer of the filling blocks 30, and then passes out of the pressure vessel from the temperature measuring hole of the pressure vessel 10, so as to realize the multi-layer penetration of the inner shroud 40, the filling blocks 30 and the pressure vessel 10.

[0039] Alternatively, if Figures 4 to 6 As shown, a movable protective sleeve 51 is provided on the outside of the thermocouple 50, and the protective sleeve 51 can slide on the outside of the thermocouple 50; the aperture of the protective sleeve 51 is larger than the diameter of the thermocouple 50, and the outer diameter of the protective sleeve 51 is not larger than the end diameter of the thermocouple 50. The length of the protective sleeve 51 is 10 mm to 30 mm; the difference between the inner diameter of the protective sleeve 51 and the outer diameter of the thermocouple 50 is less than or equal to 0.1 mm. The movable protective sleeve 51 provided in this embodiment can change its position on the thermocouple 50 according to the actual installation situation, so as to facilitate the sealing welding of the protective sleeve 51 and the inner shroud 40 after the thermocouple 50 is welded to the heat transfer tube 21. As shown Figure 6 As shown, a lead wire 54 may also be provided for conducting the electrical signal of the thermocouple.

[0040] In this embodiment, the inner shroud 40 in the pressure vessel 10 is disposed between the pressure vessel 10 and the C-type tube bundle 20, and is disposed close to the C-type tube bundle 20; the inner shroud 40 is provided with an opening, so that the thermocouple 50 passes through the inner shroud 40 through the opening and connects to the heat transfer tube 21 of the C-type tube bundle 20. The protective sleeve 51 is inserted into the opening of the inner shroud 40, and the protective sleeve 51 and the inner shroud 40 are sealed and welded by silver brazing. The connection between the thermocouple 50 and the heat transfer tube 21 is sealed by silver brazing, see Figure 5 .

[0041] In addition to the above, Figure 1 As shown, the pressure vessel 10 also has a primary side inlet head 11, a primary side outlet head 12, a secondary side inlet 13 and a secondary side outlet 14. The primary side inlet head 11 is used to distribute the working fluid coming from the primary side inlet pipe to the heat transfer tube bundle and serves as the pressure boundary of the primary side inlet); the primary side outlet head 12 is used to merge the working fluid coming out of the heat transfer tube bundle into the primary side outlet pipe and serves as the pressure boundary of the primary side outlet; the secondary side inlet 13 is used to inject the secondary side working fluid into the heat exchanger, and the secondary side outlet 14 is used to export the secondary side high-temperature steam working fluid. The heat exchanger simulation body can also be provided with a descending annular channel top plate 60, which is arranged at the secondary side inlet 13 to isolate the working fluid at the outlet of the tube bundle area from the working fluid entering the heat exchanger from the secondary side inlet. A plurality of flow distribution holes 70 can also be provided at the bottom of the heat exchanger simulation part to evenly distribute the secondary side working fluid to the tube bundle area.

[0042] The shell and tube C-shaped tube bundle heat exchanger simulation body of the embodiment of the present invention can realize the refined measurement of the heat transfer tube wall temperature by setting the thermocouple and the temperature measuring component, especially can realize the refined measurement of the heat transfer tube wall temperature of different regions of the C-type tube bundle heat exchanger with multi-layer cylinder (shell) and built-in components, and provide more solid test data support for the performance research, structural optimization and calculation program verification of the heat exchanger. The wall temperature thermocouple has good sealing performance when passing through the inner surrounding tube, and the sealing structure and method will not affect the flow area of ​​the annular flow channel, and it is necessary to ensure the integrity of the thermocouple function.

[0043] The embodiment of the present invention also provides a method for installing a thermocouple for measuring the wall temperature of a simulated heat transfer tube of a shell-and-tube C-shaped tube bundle heat exchanger with an inner shroud and a built-in filling block. The specific method is described as follows:

[0044] (1) First, determine the inner and outer diameters of the movable sleeve according to the outer diameter of the thermocouple 50 armor and the outer diameter of the sealing sleeve 53 at the terminal and the temperature measuring assembly 80 of the pressure vessel 10. The outer diameter of the movable sleeve is kept the same as the outer diameter of the sealing sleeve 53 at the terminal. The outer diameter of the movable sleeve does not exceed 4 mm, which reduces the influence of the movable sleeve on the flow area of ​​the annular flow channel. The inner diameter of the movable sleeve is slightly larger than the outer diameter of the thermocouple 50 by no more than 0.1 mm. The length of the movable sleeve is within the range of 10 mm to 30 mm. This can ensure that the movable sleeve protects the thermocouple 50 when the inner circumferential tube 40 is sealed with silver brazing, and will not affect the smooth sliding of the movable sleeve along the thermocouple 50. Figure 6 As shown, there is a gap 52 between the active sleeve and the thermocouple.

[0045] (2) Before the thermocouple 50 and the heat transfer tube 21 are silver-brazed, the movable sleeve is firstly placed on the thermocouple 50 , and then the thermocouple 50 is silver-brazed to the heat transfer tube 21 of the C-type tube bundle 20 .

[0046] (3) After the thermocouple 50 is welded to the heat transfer tube 21, the inner tube 40 is installed. The inner tube 40 has an opening, and the diameter of the opening is slightly larger than the outer diameter of the movable sleeve, and the difference is not more than 0.1 mm. The thermocouple 50 passes through the inner tube 40 from the opening, and then the movable sleeve is slid to the opening of the inner tube 40, and the movable sleeve and the inner tube 40 are sealed and welded by silver brazing. Since silver brazing requires the substrate to be preheated to a relatively high temperature to ensure that the molten welding material can be firmly bonded to the substrate, if there is no movable sleeve protection, when the inner tube 40 is preheated, the flame blocked by the inner tube 40 will spread to the surroundings, which will cause excessive burning of the thermocouple 50, which is very likely to cause the thermocouple 50 to break. After the movable sleeve is used, during the welding process, the movable sleeve can prevent the silver brazing flame from excessively burning the thermocouple 50, causing the thermocouple 50 to break. When the inner tube 40 is installed, the thermocouple 50 is allowed to pass through each inner tube 40 through the opening. After the inner tube 40 is installed, the protective sleeve 51 of the sliding thermocouple 50 is inserted into the opening, and then the protective sleeve 51 and the inner tube 40 are sealed and welded by silver brazing. The protective sleeve 51 can protect the thermocouple 50 from being broken by excessive burning of the flame during silver brazing.

[0047] (4) After the silver brazing seal of the movable sleeve and the inner shroud 40 is completed, the thermocouple 50 and the outer end of the movable sleeve are sealed and welded by silver brazing, i.e., the thermocouple sealing silver brazing 92, so as to achieve the sealing between the thermocouple 50 and the movable sleeve and prevent the working fluid from leaking from the gap between the thermocouple 50 and the movable sleeve into the bundle area of ​​the heat transfer tube 21, thereby affecting the heat exchange performance. As shown in the figure, the heat transfer tube sealing silver brazing 91, the thermocouple sealing silver brazing 92, and the inner shroud sealing silver brazing 93.

[0048] (5) After the silver brazing 92 of the thermocouple seal is completed, during the installation of the filling blocks 30 layer by layer, the lower filling blocks 30 are installed first, and then the thermocouples 50 are laid on the filling blocks 30 of this layer, and are transmitted from the corresponding temperature measurement openings of the pressure vessel 10, and then the upper filling blocks 30 are installed. A support block is arranged between the two filling blocks 30 so that a certain gap is left between the two filling blocks to prevent the upper filling block 30 from directly pressing on the thermocouples 50 and causing damage to the thermocouples 50. In this embodiment, the thermocouples 50 pass through the gaps between the filling blocks 30 of each layer, and are transmitted from the temperature measurement openings of the pressure vessel 10 arranged at the corresponding positions of each gap, so as to realize the multi-layer through-installation of the thermocouples 50 from the inner circumferential tube 40, the filling block 30 assembly and the pressure vessel 10.

[0049] (6) By adopting the above steps, the matching installation of the wall temperature thermocouples 50 at all positions and the filling blocks 30 at each layer is completed, so as to achieve the refined measurement of the temperature field of the bundle area of ​​the heat transfer tube 21.

[0050] The installation method of the thermocouple 50 for measuring the wall temperature of the simulated heat transfer tube 21 of the shell and tube C-shaped tube bundle heat exchanger with an inner shroud 40 and a built-in filling block 30 in the embodiment of the present invention is mainly used for the fine measurement of the wall temperature of the simulated heat transfer tube 21 of the shell and tube C-shaped tube bundle heat exchanger. The embodiment of the present invention provides an installation method of the heat transfer tube 21 wall temperature thermocouple 50 penetrating the inner shroud 40, the filling block 30 and the pressure vessel 10, and a silver brazing sealing method of the thermocouple 50 and the inner shroud 40. This method can realize the fine measurement of the wall temperature of the heat transfer tube 21 in different areas of the C-type tube bundle 20 heat exchanger with a multi-layer cylinder shell and built-in components, and provide more solid experimental data support for the performance research, structural optimization and calculation program verification of the heat exchanger.

[0051] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A shell and tube C-shaped tube bundle heat exchanger simulation body, characterized in that: The simulation body comprises a pressure vessel (10), a C-type tube bundle (20), a plurality of filling blocks (30) and an inner shroud (40); the heat transfer tube (21), the C-type tube bundle (20), the plurality of filling blocks (30) and the inner shroud (40) are arranged in the pressure vessel (10); the pressure vessel (10) is provided with a temperature measuring hole; the thermocouple (50) is connected to the heat transfer tube (21) of the C-type tube bundle (20) and is connected to a temperature measuring component (80) via the temperature measuring hole; The plurality of filling blocks (30) are distributed in multiple layers in the pressure container (10), and the number of filling blocks (30) in each layer is two or more; the thermocouple (50) passes through the gaps between the filling blocks (30) in each layer, and passes out from the temperature measuring holes of the pressure container (10) arranged at positions corresponding to the gaps in each layer.

2. The shell and tube C-shaped tube bundle heat exchanger simulation body according to claim 1, characterized in that: A movable protective sleeve (51) is arranged on the outside of the thermocouple (50), and the protective sleeve (51) can slide on the outside of the thermocouple (50); The aperture of the protective sleeve (51) is larger than the diameter of the thermocouple (50), and the outer diameter of the protective sleeve (51) is not larger than the end diameter of the thermocouple (50).

3. The shell and tube C-shaped tube bundle heat exchanger simulation body according to claim 2, characterized in that: The length of the protective sleeve (51) is 10 mm to 30 mm; The difference between the inner diameter of the protective sleeve (51) and the outer diameter of the thermocouple (50) is less than or equal to 0.1 mm.

4. The shell and tube C-shaped tube bundle heat exchanger simulation body according to claim 1, characterized in that: The inner shroud (40) is disposed between the pressure vessel (10) and the C-shaped tube bundle (20), and is disposed close to the C-shaped tube bundle (20); The inner shroud (40) is provided with an opening, so that the thermocouple (50) passes through the inner shroud (40) via the opening and is connected to the heat transfer tube (21) of the C-type tube bundle (20).

5. The shell and tube C-shaped tube bundle heat exchanger simulation body according to claim 4, characterized in that: The protective sleeve (51) is inserted into the opening of the inner shroud (40), and the protective sleeve (51) and the inner shroud (40) are sealed and welded by silver brazing.

6. The shell and tube C-shaped tube bundle heat exchanger simulation body according to claim 5, characterized in that: The connection between the thermocouple (50) and the heat transfer tube (21) is sealed by silver brazing.

7. A method for installing a thermocouple (50) for measuring the wall temperature of a heat transfer tube (21) of a shell and tube C-shaped tube bundle heat exchanger as claimed in any one of claims 1 to 6, characterized in that: The method comprises: Determining the inner diameter and outer diameter of the movable sleeve according to the outer diameter of the thermocouple (50) and the outer diameter of the terminal sealing sleeve (53); The movable sleeve is placed on the thermocouple (50), and the thermocouple (50) is then silver-brazed to the heat transfer tube (21) of the C-type tube bundle (20); Passing the thermocouple (50) through the opening of the inner shell (40), sliding the movable sleeve to the opening of the inner shell (40), and sealing and welding the movable sleeve and the inner shell (40); Performing sealing welding on the thermocouple (50) and the outer end of the movable sleeve to achieve sealing between the thermocouple (50) and the movable sleeve; Filling blocks (30) are installed layer by layer in the pressure container (10).

8. The method according to claim 7, characterized in that When installing the filling blocks (30) layer by layer in the pressure container (10), the lower filling blocks (30) are installed first, and then the thermocouples (50) are laid on the filling blocks (30) of this layer and transmitted from the corresponding temperature measuring openings of the pressure container (10), and then the upper filling blocks (30) are installed. A support block is arranged between the two filling blocks (30) so that a certain gap is retained between the two filling blocks.

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