A shell-and-tube c-shaped tube bundle heat exchanger simulation body and mounting method

Abstract

The application discloses a shell-and-tube C-shaped tube bundle heat exchanger simulation body and a mounting method. The heat exchanger simulation body is characterized in that a thermocouple and a temperature measuring assembly are arranged, the thermocouple is matched with each layer of filling blocks, and the fine measurement of the temperature field of the heat transfer tube bundle area is realized. The fine measurement of the heat transfer tube wall temperature can be realized, especially the fine measurement of the heat transfer tube wall temperature in different areas of the C-shaped tube bundle heat exchanger with multiple cylinder layers and built-in components can be realized. More solid test data support is provided for the performance research, structure optimization and calculation program verification of the heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of power system test and 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 power systems, the shell-and-tube C-tube bundle heat exchanger is a new type of high-efficiency heat exchange equipment. The C-tube bundle structure effectively suppresses the localized backflow phenomenon of U-tube bundle heat exchangers under low-load conditions, thereby improving the heat exchange efficiency of the heat exchanger. To optimize the flow distribution of the secondary working fluid in the tube bundle area, based on project requirements, the C-tube bundle heat exchanger is typically equipped with an inner shroud. This shroud forms an annular channel between the inner shroud and the pressure shell, and the secondary working fluid is distributed throughout the tube bundle area through diverter holes at the bottom of the shroud.

[0003] According to the simulation criteria, filling blocks must be installed 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-down simulation body test of the C-tube bundle heat exchanger, in order to obtain the flow and heat transfer characteristics of the C-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-tube bundle heat exchanger are generally high temperature and high pressure. After actual testing with various wall temperature measuring instruments, thermocouples are still the most reliable wall temperature measuring instruments. However, for this type of shell and tube C-tube bundle heat exchanger simulation body with an inner tube and built-in filling blocks, the existing technology 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, making it impossible to achieve refined measurement of the heat transfer tube wall temperature. Summary of the Invention

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

[0005] The present invention provides a shell-and-tube C-shaped tube bundle heat exchanger simulation body, the simulation body comprising a pressure vessel, a C-shaped tube bundle, a plurality of filling blocks, and an inner shroud, wherein the heat transfer tubes, 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 tubes of the C-shaped tube bundle, and is connected to a temperature measuring assembly via the temperature measuring hole;

[0006] The multiple filling blocks are distributed in multiple layers in the pressure vessel, 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 vessel arranged at the corresponding positions of the gaps in each layer.

[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-shaped tube bundle, and is disposed close to the C-shaped 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 and outer diameters of the movable sleeve according to the outer diameter of the thermocouple and the outer diameter of the sealing sleeve at the terminal;

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

[0018] Passing the thermocouple through the opening of the inner shell, sliding the movable sleeve to the opening of the inner shell, and sealing and welding 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 vessel, install the lower filling blocks first, then lay the thermocouple on top of the filling blocks of this layer, and transmit it from the corresponding temperature measuring opening of the pressure vessel, and then install the upper filling blocks. Support blocks are set between the two layers of filling blocks so that a certain gap is maintained between the two layers of filling blocks.

[0022] The shell and tube C-type tube bundle heat exchanger simulator provided by the present invention realizes the refined measurement of the tube bundle area parameters of the shell and tube C-type tube bundle heat exchanger test simulator with an inner circumferential tube and built-in filling blocks, providing sufficient data support for the optimization of the shell and tube C-type 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 10mm to 30mm. 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 welding the thermocouple and the heat transfer tube, the movable sleeve is first put on the thermocouple. After the welding of the thermocouple and the heat transfer tube is completed, the inner shell is installed. Silver brazing is used to seal the movable sleeve and the inner shell. Silver brazing is used to seal the thermocouple and the end of the movable sleeve. 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, realizing 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 This is a general structural diagram of a test simulation body of a shell-and-tube 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 casing, the gap between the filling blocks, and the pressure vessel cylinder in sequence.

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

[0031] Figure 6This is a schematic diagram of the installation of a thermocouple and a movable sleeve according to an embodiment of the present invention. The movable sleeve can be repositioned on the thermocouple according to actual installation conditions, facilitating the sealing welding of the protective sleeve and the inner casing after the thermocouple is welded to the heat transfer tube.

[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 cylinder, 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 cylinder 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 to 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 device or element referred to 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] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] The preferred embodiments of the present invention are described below with reference to 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 circumferential tube and a built-in filling block, such as Figures 1 to 3 As shown, the shell and tube C-tube bundle heat exchanger simulation body of this embodiment includes a pressure vessel 10, a C-tube bundle 20, multiple filling blocks 30 and an inner shroud 40. The heat transfer tubes 21, the C-tube bundle 20, the multiple 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-tube bundle 20, and is connected to the temperature measuring component 80 via the temperature measuring hole, and the temperature of the heat exchanger is then 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 vessel 10, and the number of filling blocks 30 in each layer is two or more; the thermocouple 50 passes through the gaps between each layer of filling blocks 30 and exits from the temperature measuring holes of the pressure vessel 10 set at the corresponding positions of each layer of gaps. Figure 2 The area indicated by the oval and Figure 4 This is a schematic diagram of the installation of a wall temperature thermocouple 50. The thermocouple 50, which measures the wall temperature of the heat transfer tube 21, sequentially passes through the inner tube 40, the gap 31 between the filling blocks, and the body of the pressure vessel 10. In this embodiment, the movable sleeve and the inner tube 40 are sealed using silver brazing, and the thermocouple 50 and the end of the movable sleeve are also sealed using silver brazing. The thermocouple 50 is installed in the gaps between each layer of filling blocks 30 and then transmits the temperature out of the pressure vessel 10 through the temperature measurement hole, thus achieving multi-layer penetration of the inner tube 40, the filling blocks 30, and the pressure vessel 10.

[0039] Alternatively, as 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 10mm to 30mm; 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 0.1mm. 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 casing 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 within the pressure vessel 10 is disposed between the pressure vessel 10 and the C-type tube bundle 20, and is disposed adjacent 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. A 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 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 entering 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 collect the working fluid exiting 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 discharge 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 provided 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 at 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-tube heat exchanger simulator of the present invention, equipped with thermocouples and temperature measurement components, enables precise measurement of heat transfer tube wall temperature. This is particularly true for C-tube heat exchangers with multi-layered cylinders (shells) and internal components, providing more robust experimental data support for heat exchanger performance research, structural optimization, and computational program verification. The wall temperature thermocouples ensure excellent sealing performance when passing through the inner shroud, and the sealing structure and method do not affect the annular flow area, ensuring the integrity of the thermocouples.

[0043] The embodiment of 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 with an inner shroud and a built-in filler block. The specific method is described as follows:

[0044] (1) First, determine the inner diameter and outer diameter of the movable sleeve based on the outer diameter of the thermocouple 50 armor and the outer diameter of the sealing sleeve 53 at the terminal end 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 end. 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, and the difference does not exceed 0.1 mm. The length of the movable sleeve is within the range of 10 mm to 30 mm, which can ensure that the movable sleeve protects the thermocouple 50 when the inner 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 movable sleeve and the thermocouple.

[0045] (2) Before silver brazing the thermocouple 50 and the heat transfer tube 21 , first place the movable sleeve on the thermocouple 50 , and then silver braze the thermocouple 50 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, with a difference of no 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. Silver brazing is used to seal the movable sleeve and the inner tube 40. Since silver brazing requires the base material to be preheated to a high temperature to ensure that the melted welding material can be firmly bonded to the base material, 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 surrounding area, 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 installing the inner tube 40, allow the thermocouple 50 to pass through each inner tube 40 through the opening. After the installation of the inner tube 40 is completed, slide the protective sleeve 51 of the thermocouple 50 into the opening, and then use silver brazing to seal the protective sleeve 51 and the inner tube 40. 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 between the movable sleeve and the inner casing 40 is completed, the thermocouple 50 is sealed to the outer end of the movable sleeve using silver brazing, i.e., the thermocouple sealing silver brazing 92. This seals the thermocouple 50 and the movable sleeve and prevents the working fluid from leaking into the heat transfer tube 21 bundle area through the gap between the thermocouple 50 and the movable sleeve, thereby affecting the heat transfer performance. As shown in the figure, the heat transfer tube sealing silver brazing 91, the thermocouple sealing silver brazing 92, and the inner casing sealing silver brazing 93 are shown.

[0048] (5) After completing the silver brazing 92 of the thermocouple seal, 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 measuring openings of the pressure vessel 10, and then the upper filling blocks 30 are installed. A support block is set between the two layers of filling blocks 30 so that a certain gap is retained between the two layers of filling blocks to prevent the upper filling blocks 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 measuring openings of the pressure vessel 10 set at the corresponding positions of each gap, thereby realizing the multi-layer through-installation of the thermocouples 50 from the inner circumference 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 in the bundle area of ​​the heat transfer tubes 21.

[0050] The method for installing a thermocouple 50 for measuring the wall temperature of heat transfer tubes 21 in a shell-and-tube C-tube bundle heat exchanger with an inner shell 40 and built-in filler blocks 30, according to an embodiment of the present invention, is primarily used for precise measurement of the wall temperature of heat transfer tubes 21 in a shell-and-tube C-tube bundle heat exchanger. The embodiment of the present invention provides a method for installing the heat transfer tube 21 wall temperature thermocouple 50 through the inner shell 40, filler blocks 30, and pressure vessel 10, as well as a method for silver brazing and sealing the thermocouple 50 to the inner shell 40. This method enables precise measurement of the wall temperature of heat transfer tubes 21 in different regions of a C-tube bundle 20 heat exchanger with a multi-layered shell and built-in components, providing more robust experimental data support for heat exchanger performance research, structural optimization, and computational program verification.

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

Claims

1. A shell and tube C-shaped tube bundle heat exchanger simulation body, characterized in that: The simulation body includes a pressure vessel (10), a C-type tube bundle (20), a plurality of filling blocks (30) and an inner surrounding tube (40), wherein the heat transfer tube (21), the C-type tube bundle (20), the plurality of filling blocks (30) and the inner surrounding tube (40) are arranged in the pressure vessel (10); the pressure vessel (10) is provided with a temperature measuring hole, and 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; a movable protective sleeve (51) is provided on the outside of the thermocouple (50); The plurality of filling blocks (30) are distributed in multiple layers within the pressure vessel (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 exits from the temperature measuring holes of the pressure vessel (10) provided at positions corresponding to the gaps in each layer; The inner shroud (40) is arranged between the pressure vessel (10) and the C-type tube bundle (20), and is arranged 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 is connected to the heat transfer tube (21) of the C-type tube bundle (20).

2. The shell and tube C-shaped tube bundle heat exchanger simulation body according to claim 1, characterized in that: The protective sleeve (51) can slide outside 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 protective sleeve (51) is inserted into the opening of the inner circumference tube (40), and the protective sleeve (51) and the inner circumference tube (40) are sealed and welded by silver brazing.

5. The shell and tube C-shaped tube bundle heat exchanger simulation body according to claim 4, characterized in that: The connection between the thermocouple (50) and the heat transfer tube (21) is sealed by silver brazing.

6. 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 5, characterized in that: The method comprises: Determine 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 cylinder (40), sliding the movable sleeve to the opening of the inner cylinder (40), and sealing and welding the movable sleeve and the inner cylinder (40); Sealing and welding 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).

7. The method according to claim 6, 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 opening of the pressure container (10), and then the upper filling blocks (30) are installed. A support block is set between the two layers of filling blocks (30) so that a certain gap is retained between the two layers of filling blocks.

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