A supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function and its installation method.

Abstract

This invention relates to the field of thermal power generation and turbine mechanical condition monitoring technology. The invention discloses a supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function and its installation method, including a temperature sensing device housing, a temperature sensing element, and a lead wire connection assembly. The temperature sensing element includes an armored lead wire body and a temperature sensing element thermistor. The temperature sensing device housing includes a flange, an insertion section and a connecting section respectively disposed at both axial ends of the flange. A first receiving cavity is provided axially inside the temperature sensing device housing. The opening of the first receiving cavity is located at the end of the connecting section, and its bottom is located at the end of the insertion section. A connector mounting seat is threadedly connected to the end of the connecting section away from the insertion section. The armored lead wire body is detachably connected to the connector mounting seat through the lead wire connection assembly, and its end is located at the bottom of the first receiving cavity. The insertion section is used to pass through the insertion through-hole of the outer cylinder and extend into the temperature sensing hole of the inner cylinder. This invention has the advantages of good sealing effect and online maintenance capability.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation and turbine mechanical condition monitoring technology, specifically a supercritical CO2 turbine temperature monitoring device with online replacement function of temperature sensing element and its installation method. Background Technology

[0002] Supercritical carbon dioxide (sCO2) power cycles, with their advantages of high efficiency and compact system, have shown significant application potential in advanced power generation, waste heat recovery and other fields.

[0003] like Figure 1 As shown, the turbine, as the core working component of the sCO2 cycle, requires sufficient safety and reliability under high-temperature and high-pressure conditions. This is especially important for ensuring the sealing of the horizontal split surface of the cylinder and reducing the working stress on the fastening bolts. High-parameter turbines typically employ a double-layer cylinder structure consisting of an inner cylinder 2 and an outer cylinder 1. The interlayer of this structure is connected to the exhaust gas from the inner cylinder 2 or the intermediate final stage exhaust gas, allowing the inner cylinder 2 and outer cylinder 1 to respectively bear a portion of the pressure and temperature differences. To monitor the temperature field at different locations within the inner cylinder 2 and outer cylinder 1 of the turbine, temperature measuring points are typically installed at typical positions on both cylinders.

[0004] In high-parameter turbine devices employing a double-cylinder structure, the pressure in the interlayer space is generally above 5 MPa. Therefore, the temperature sensing element 4, used to measure the temperature of the inner and outer walls of the inner cylinder 2 or the temperature of the medium, must withstand high interlayer sealing pressure, which places extremely high demands on the sealing reliability and service life of the temperature monitoring device.

[0005] In practical applications, the sealing of temperature sensing element 4 often fails, leading to media leakage.

[0006] like Figure 1 , Figure 2 As shown, the mounting base 3 includes an insertion end 31 and a connecting end 32 away from the insertion end 31, as well as a first through hole 33 penetrating the insertion end 31 and the connecting end 32. The first through hole 33 is used for the armored lead body 41 to pass through, and the connecting end 32 is provided with a mounting screw hole.

[0007] The temperature sensing element 4 includes an armored lead body 41 and a temperature sensing element thermistor 42 disposed at the end of the armored lead body 41.

[0008] The lead wire connection assembly includes a threaded connector 5, a ferrule 6, and a ferrule locking nut 7. The threaded connector 5 includes a threaded section 51 connected to the mounting screw hole, a stop portion 52 with an outer diameter larger than the threaded section 51, and a ferrule locking threaded section 53 located away from the threaded section 51. The threaded section 51 and the ferrule locking threaded section 53 are respectively located at both ends of the stop portion 52 in the axial direction.

[0009] The threaded connector 5 also has a second through hole 54 through the threaded section 51, the stop part 52, and the ferrule locking threaded section 53 for the armored lead wire to pass through. The armored lead wire body 41 passes through the second through hole 54 of the threaded connector 5, and a ferrule 6 is provided near the ferrule locking threaded section 53. The ferrule locking nut 7 has a third through hole for the armored lead wire body 41 to pass through. The ferrule locking nut 7 passes through the third through hole, covers the armored lead wire, is located near the ferrule 6, and is threadedly connected to the ferrule locking threaded section 53. The ferrule locking threaded section 53 and the ferrule locking nut 7 are respectively provided with ferrule 6 positioning grooves on opposite sides.

[0010] In actual use, the outer cylinder 1 is provided with an insertion through hole 11 for inserting the housing of the temperature measuring device. Corresponding to the insertion through hole 11, the inner cylinder 2 is provided with a temperature measuring hole 21 for inserting the armored lead body 41. The end of the temperature measuring hole 21 forms a receiving cavity for the thermistor part 42 of the temperature measuring element. After the mounting base 3, the armored lead body 41, and the lead connection assembly are assembled, the mounting base 3 is inserted into the insertion through hole 11 of the outer cylinder 1, and the armored lead body 41 is sequentially inserted into the mounting base 3 and the temperature measuring hole 21, so that the thermistor part 42 of the temperature measuring element is fully in the test position. Among them, after the threaded connector 5 is connected to the mounting base 3, the stop part 52 of the threaded connector 5 and the opposite side of the mounting base 3 are in contact with each other.

[0011] However, during use, when the sealing pressure in the interlayer space between the inner cylinder 2 and the outer cylinder 1 is too high, the sealing pressure is transmitted outward through the first through hole 33, causing the thread seal between the threaded section 51 of the threaded joint 5 and the mounting base 3 to fail; and the sealing pressure is transmitted outward through the second through hole 54, causing the ferrule 6 to fail to seal.

[0012] If not addressed promptly, this could seriously threaten the safety of the turbine equipment and the lives and property of operation and maintenance personnel. Furthermore, this type of temperature sensing device cannot be immediately replaced online after the temperature sensing element 4 is damaged; replacement can only be performed after the turbine unit has been completely shut down. Forced shutdown would impact power grid dispatching or the power demand of downstream drive equipment. Summary of the Invention

[0013] The purpose of this invention is to address the shortcomings of existing technologies by providing a supercritical CO2 turbine temperature monitoring device and its installation method that does not bear the pressure of the turbine working fluid, does not suffer from sealing failure due to excessive sealing pressure, can replace damaged temperature sensing elements online without waiting for the turbine unit to shut down, and can extend the service life of the temperature sensing elements.

[0014] The technical objective of this invention is achieved through the following technical solution: A temperature monitoring device for a supercritical CO2 turbine with online temperature sensing element replacement capability is disclosed. This device is used with a supercritical CO2 turbine having an inner and outer cylinder. It includes a temperature sensing device housing, a temperature sensing element, and a lead wire connection assembly. The temperature sensing element comprises an armored lead wire body and a temperature sensing element thermistor located at the end of the armored lead wire body. The temperature sensing device housing includes a flange, an insertion section, and a connecting section located at both axial ends of the flange. A first receiving cavity is provided axially within the temperature sensing device housing for inserting the armored lead wire body. The opening of the first receiving cavity is located at the end of the connecting section, and its bottom is located at the end of the insertion section. A threaded portion is provided at the end of the connecting section away from the insertion section, and the threaded portion is connected to a connector mounting seat. The connector mounting base is provided with a fourth through hole for the armored lead wire body to pass through; one end of the armored lead wire body is detachably connected to the connector mounting base through a lead wire connection assembly, and the end with the temperature sensing element is located at the bottom of the first receiving cavity; the insertion section is used to pass through the insertion through hole of the outer cylinder and extend into the temperature sensing hole of the inner cylinder; the flange is detachably connected to the outer cylinder, and the opposite sides of the two are in contact with each other.

[0015] Preferably, the insertion segment includes a first insertion segment, a second insertion segment, and a third insertion segment with diameters decreasing progressively from near to far; the opening extends to the end of the third insertion segment and forms a cavity at the end for accommodating the thermistor of the temperature sensing element; correspondingly, the temperature sensing hole of the inner cylinder includes a first hole segment through which the second insertion segment passes and a second hole segment into which the third insertion segment is inserted.

[0016] Preferably, a gasket mounting groove is provided on the side of the outer cylinder away from the inner cylinder and near the insertion through hole. A metal spiral wound gasket is provided in the gasket mounting groove, and the two axial ends of the metal spiral wound gasket abut against the flange and the outer cylinder, respectively.

[0017] Preferably, the lead wire connection assembly includes a threaded connector, a ferrule, and a ferrule locking nut; the threaded connector is installed at the end of the connector mounting base away from the connection portion.

[0018] Preferably, the threaded connector includes a stop portion that is annular and larger than the diameter of the threaded section, a threaded section and a ferrule locking threaded section respectively disposed at both axial ends of the stop portion, and a second through hole for axially penetrating the threaded section, the stop portion and the ferrule locking threaded section; the threaded section is threadedly connected to the end of the connector mounting base away from the connecting portion, and the second through hole is used for the armored lead body to pass through.

[0019] Preferably, the ferrule is positioned near the locking thread section of the ferrule on the armored lead wire; the ferrule locking nut has a third through hole through which the armored lead wire body passes, and the ferrule locking nut passes through the third through hole to the armored lead wire, covers the outside of the ferrule, and is threadedly connected to the locking thread section of the ferrule.

[0020] Preferably, when the temperature measuring hole of the inner cylinder is a temperature measuring through hole, a temperature measuring protective sleeve is installed in the temperature measuring through hole, and the temperature measuring protective sleeve is used to cover the second and third insertion sections of the insertion section.

[0021] Preferably, the temperature measuring protective sleeve includes a sleeve opening and a sleeve cavity for accommodating the second insertion section and the third insertion section; the sleeve cavity forms a temperature measuring part for accommodating the thermistor of the temperature measuring element; the outer side of the temperature measuring protective sleeve is provided with a limiting protrusion, and correspondingly, the inner cylinder is provided with a limiting groove that cooperates with the limiting protrusion.

[0022] A method for installing a supercritical CO2 turbine temperature monitoring device as described in any of the above claims, used for measuring the metal temperature of the inner cylinder, includes the following steps: A temperature measuring hole is machined at the temperature measuring part of the inner cylinder, and a guide hole is machined at the opening of the temperature measuring hole; Insertion through holes, screw holes, and gasket mounting slots are machined at corresponding positions on the outer cylinder; Assemble the connector mounting base and the temperature measuring device housing into one unit, then insert the temperature measuring device housing into the temperature measuring hole of the inner cylinder, and connect the flange of the temperature measuring device housing to the outer cylinder with screws. At the same time, install the metal spiral wound gasket in the gasket mounting groove during the installation process. The total length from the outer end of the connector mounting base to the bottom end of the first receiving cavity of the temperature measuring device housing after the connector mounting base and the temperature measuring device housing are assembled into one unit is denoted as the installation insertion depth. Install the temperature sensing element onto the connector mounting base via the lead wire connection assembly, and adjust the insertion depth of the temperature sensing element to match the measured installation insertion depth, ensuring that the thermal part of the temperature sensing element is in contact with the bottom of the temperature sensing hole.

[0023] A method for installing a supercritical CO2 turbine temperature monitoring device as described above, used for measuring the temperature of the working fluid inside the inner cylinder, includes the following steps: A temperature measuring through hole is machined at the temperature measuring part of the inner cylinder, and a temperature measuring protective sleeve is fixed in the temperature measuring through hole. A guide hole is machined at the opening of the temperature measuring protective sleeve. Insertion through holes, screw holes, and gasket mounting slots are machined at corresponding positions on the outer cylinder; Assemble the connector mounting base and the temperature measuring device housing into one unit, then insert the temperature measuring device housing into the temperature measuring part of the temperature measuring protective sleeve, and connect the flange of the temperature measuring device housing to the outer cylinder with screws. At the same time, install the metal spiral wound gasket in the gasket mounting groove during the installation process. The total length from the outer end of the connector mounting base to the bottom end of the first receiving cavity of the temperature measuring device housing after the connector mounting base and the temperature measuring device housing are assembled into one unit is denoted as the installation insertion depth. Install the temperature sensing element onto the connector mounting base via the lead wire connection assembly, and adjust the insertion depth of the temperature sensing element to match the measured installation insertion depth, ensuring that the thermal part of the temperature sensing element is in contact with the bottom of the temperature sensing hole.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention fundamentally solves the sealing failure problem caused by the high permeability of supercritical CO2 by physically isolating the sealing structure of the temperature sensing element from the high-pressure jacket space, while also enabling online replacement of the temperature sensing element without shutting down the system. This invention has the advantages of good sealing performance and online maintenance capability.

[0025] 2. This invention, by setting the insertion section as a multi-stage stepped structure with the diameter decreasing from near to far, and forming a precise fit with the stepped hole section corresponding to the temperature measuring hole of the inner cylinder, not only achieves precise radial positioning and axial guidance between the temperature measuring device housing and the inner cylinder, effectively preventing insertion deviation, but also adaptively absorbs the relative displacement caused by the thermal expansion difference between the inner cylinder and the temperature measuring flange under high temperature conditions through the matching contact of each stepped section and the hole section, ensuring that the end of the third insertion section always maintains stable contact with the bottom of the temperature measuring hole. Thus, while ensuring the accuracy of temperature measurement, it provides a reliable mechanical basis for online replacement of the temperature measuring element. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the use of an existing temperature monitoring device; Figure 2 yes Figure 1 Enlarged view of section A and schematic diagram of the location of seal failure when the existing temperature monitoring device is in use; Figure 3 This is a schematic diagram of the structure of the present invention when used for measuring the metal temperature of the inner cylinder; Figure 4 This is a schematic diagram of the structure for measuring the internal working fluid temperature of the present invention. Reference numerals: 1—Outer cylinder; 11—Insertion through hole; 12—Metal spiral wound gasket; 2—Inner cylinder; 21—Temperature measuring hole; 211—First hole section; 212—Second hole section; 22—Temperature measuring protective sleeve; 221—Sleeve cavity; 222—Limiting protrusion; 23—Limiting groove; 3—Mounting base; 31—Insert end; 32—Connecting end; 33—First through hole; 4—Temperature sensing element; 41—Sheathed lead body; 42—Thermistor of temperature sensing element; 5—Threaded connector; 51—Threaded section; 52—Stop; 53—Locking threaded section; 54—Second through hole; 6—Flange; 7—Flange locking nut; 8—Housing of temperature measuring device; 81—Flange; 82—Insertion section; 821—First insertion section; 822—Second insertion section; 823—Third insertion section; 83—Connecting part; 84—Bolt; 9—Connector mounting base; L—Installation depth. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] like Figures 1-4As shown, a supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function is used in a supercritical CO2 turbine having an inner cylinder 2 and an outer cylinder 1; it includes a temperature sensing device housing 8, a temperature sensing element 4, and a lead wire connection assembly; the temperature sensing element 4 includes an armored lead wire body 41 and a temperature sensing element thermistor 42 disposed at the end of the armored lead wire body 41; the temperature sensing device housing 8 includes a flange 81, an insertion section 82 and a connecting section 83 respectively disposed at both axial ends of the flange 81; the temperature sensing device housing 8 has a first receiving cavity along its axial direction for inserting the armored lead wire body 41; the opening of the first receiving cavity is disposed at the end of the connecting section 83, and its bottom is disposed at the end of the insertion section 82; the end of the connecting section 83 away from the insertion section 82 has a threaded part, and the threaded part is connected to a connector mounting seat 9. The connector mounting base 9 has a fourth through hole through which the armored lead wire body 41 passes; one end of the armored lead wire body 41 is detachably connected to the connector mounting base 9 via a lead wire connection assembly, and the end with the temperature sensing element thermistor 42 is located at the bottom of the first receiving cavity; the insertion section 82 is used to pass through the insertion through hole 11 of the outer cylinder 1 and extend into the temperature sensing hole 21 of the inner cylinder 2; the flange part 81 is detachably connected to the outer cylinder 1, and their opposite sides are fitted together. By physically isolating the sealing structure of the temperature sensing element 4 from the high-pressure jacket space, the problem of sealing failure caused by the high permeability of supercritical CO2 is fundamentally solved, and the online replacement of the temperature sensing element 4 without stopping the machine is realized.

[0031] like Figures 3-4 As shown, the insertion section 82 includes a first insertion section 821, a second insertion section 822, and a third insertion section 823, with their diameters decreasing progressively from near to far. The opening extends to the end of the third insertion section 823, where a cavity is formed to accommodate the thermistor part 42 of the temperature sensing element. Correspondingly, the temperature sensing hole 21 of the inner cylinder 2 includes a first hole section 211 through which the second insertion section 822 passes and a second hole section 212 through which the third insertion section 823 is inserted. In a specific implementation, a guide hole is provided at the opening of the temperature sensing hole 21 of the inner cylinder 2. This device, by setting the insertion section 82 as a multi-stage stepped structure with the diameter decreasing from near to far, and forming a precise fit with the stepped hole section corresponding to the temperature measuring hole 21 of the inner cylinder 2, not only achieves precise radial positioning and axial guidance between the temperature measuring device housing 8 and the inner cylinder 2, effectively preventing insertion deviation, but also adaptively absorbs the relative displacement caused by the thermal expansion difference between the inner cylinder 2 and the temperature measuring device housing 8 under high temperature conditions through the matching contact of each stepped section and the hole section. This ensures that the end of the third insertion section 823 always maintains stable contact with the bottom of the temperature measuring hole 21, thus providing a reliable mechanical basis for online replacement of the temperature measuring element 4 while ensuring temperature measurement accuracy.

[0032] like Figures 3-4As shown, a gasket mounting groove is provided on the side of the outer cylinder 1 away from the inner cylinder 2, near the insertion through hole 11. A metal spiral wound gasket 12 is provided in the gasket mounting groove, and the two axial ends of the metal spiral wound gasket 12 abut against the flange part 81 and the outer cylinder 1, respectively. By setting the metal spiral wound gasket 12 in the gasket mounting groove between the flange part 81 and the outer cylinder 1 and making it axially abut against the flange, the sealing reliability of the flange connection surface under high temperature and high pressure conditions is effectively enhanced, and leakage of supercritical CO2 working fluid is prevented.

[0033] like Figures 1-4 As shown, the lead wire connection assembly includes a threaded connector 5, a ferrule 6, and a ferrule locking nut 7; the threaded connector 5 is installed at the end of the connector mounting base 9 away from the connecting part 83. In a specific implementation, the inner walls of the fourth through hole of the connector mounting base 9 are respectively provided with internal threads at both ends. One end of the connector mounting base 9 is connected to the threaded part of the connecting part 83, and the other end is connected to the threaded connector 5.

[0034] The threaded connector 5 includes a stop portion 52 that is annular and larger than the diameter of the threaded section 51, a threaded section 51 and a ferrule locking threaded section 53 respectively provided at both axial ends of the stop portion 52, and a second through hole 54 that axially penetrates the threaded section 51, the stop portion 52 and the ferrule locking threaded section 53; the threaded section 51 is threadedly connected to the end of the connector mounting base 9 away from the connecting portion 83, and the second through hole 54 is used for the armored lead body 41 to pass through.

[0035] The ferrule 6 is located on the armored lead body 41 near the ferrule locking thread section 53; the ferrule locking nut 7 is provided with a third through hole through which the armored lead body 41 passes. The ferrule locking nut 7 passes through the third through hole through the armored lead body 41, covers the ferrule 6, and is threadedly connected to the ferrule locking thread section 53.

[0036] like Figure 4As shown, when the temperature measuring hole 21 of the inner cylinder 2 is a through-hole, a temperature measuring protective sleeve 22 is installed in the through-hole. The temperature measuring protective sleeve 22 is used to cover the second insertion section 822 and the third insertion section 823 of the insertion section 82. The material of the temperature measuring protective sleeve 22 must be of the same grade as the material of the inner cylinder 2 to ensure that it can withstand the temperature of the working medium and has high temperature resistance, etc. When the temperature measuring hole 21 of the inner cylinder 2 is a through-hole (i.e., used to measure the temperature of the working medium flowing through the inner cylinder 2), by independently setting the temperature measuring protective sleeve 22 in the through-hole of the inner cylinder 2, and having the temperature measuring protective sleeve 22 cover the second insertion section 822 and the third insertion section 823 of the temperature measuring device housing 8, the following beneficial effects are achieved: On the one hand, the temperature measuring protective sleeve 22 isolates the temperature measuring device housing 8 from the high temperature and high pressure flowing medium inside the inner cylinder 2, so that the temperature measuring device housing 8 is still in a pressureless or low-pressure sandwich environment, thereby maintaining the thread. The sealing structures such as connector 5 and ferrule 6 do not bear the pressure of the medium. On the other hand, the temperature measuring protective sleeve 22, as an independent pressure-bearing component, can provide a dedicated installation channel for the thermal element to measure the temperature of the flowing medium without changing the overall structure of the inner cylinder 2. At the same time, through its stepped fit with the insertion section 82, it ensures that the thermal part 42 of the temperature measuring element can be accurately inserted into the preset measuring point position in the medium flow channel. This not only expands the temperature measuring function of the device, but also ensures the repeatability and sealing reliability when replacing the temperature measuring element 4 online.

[0037] like Figure 4 As shown, the temperature measuring protective sleeve 22 includes a sleeve opening and a sleeve cavity 221 for accommodating the second insertion section 822 and the third insertion section 823; the sleeve cavity 221 forms a temperature measuring part for accommodating the thermistor part 42 of the temperature measuring element; a limiting protrusion 222 is provided on the outer side of the temperature measuring protective sleeve 22, and correspondingly, the inner cylinder 2 is provided with a limiting groove 23 that cooperates with the limiting protrusion 222. By setting a limiting protrusion 222 on the outside of the temperature measuring protective sleeve 22 and precisely matching it with the limiting groove 23 of the inner cylinder 2, this structure can achieve rapid and accurate axial and circumferential positioning during installation, preventing the temperature measuring protective sleeve 22 from rotating or axially shifting under high temperature and high pressure conditions. This ensures that the second insertion section 822 and the third insertion section 823 are always concentric with the sleeve cavity 221 and that the thermal sensing part 42 of the temperature measuring element is precisely aligned with the preset measuring point position. At the same time, this limiting structure can ensure that the temperature measuring protective sleeve 22 can be reset to the same installation position each time the temperature measuring element 4 is repeatedly disassembled and reassembled, thereby significantly improving the repeatability and temperature measurement consistency after online replacement of the temperature measuring element 4, and effectively avoiding the risk of mechanical wear or sealing failure caused by sleeve displacement.

[0038] like Figure 3 As shown, in practical use, a method for installing a supercritical CO2 turbine temperature monitoring device for measuring the metal temperature of the inner cylinder includes the following steps: A temperature measuring hole 21 is machined at the temperature measuring part of the inner cylinder 2, and a guide hole is machined at the opening of the temperature measuring hole 21; The insertion through hole 11, the screw hole, and the gasket mounting groove are machined at the corresponding positions of the outer cylinder 1; Assemble the connector mounting base 9 and the temperature measuring device housing 8 into one unit. Then, insert the temperature measuring device housing 8 into the temperature measuring hole 21 of the inner cylinder 2, and connect the flange 81 of the temperature measuring device housing 8 to the outer cylinder 1 using bolts 84. Simultaneously, install the metal spiral wound gasket 12 into the gasket mounting groove during installation. In actual use, there is a small gap between the third insertion section 823 of the insertion section 82 of the temperature measuring device housing 8 and the temperature measuring hole 21. The material expansion coefficient of the temperature measuring device housing 8 should be as consistent as possible with the material of the temperature measuring hole 21 (i.e., the cylinder).

[0039] The total length from the outer end of the measuring connector mounting base 9 to the bottom end of the first receiving cavity of the temperature measuring device housing 8 after the measuring connector mounting base 9 and the temperature measuring device housing 8 are assembled into one unit is denoted as the installation insertion depth L. The temperature sensing element 4 is installed on the connector mounting base 9 via the lead wire connection assembly, and the insertion depth of the temperature sensing element 4 is adjusted to match the measured installation insertion depth L, ensuring that the thermal part 42 of the temperature sensing element is in contact with the bottom of the temperature sensing hole 21.

[0040] This installation method involves pre-assembling the connector mounting base 9 and the temperature measuring device housing 8 into a single unit, then inserting the entire unit into the inner cylinder 2. The position of the temperature measuring element 4 is precisely adjusted according to the measured insertion depth L, ensuring that the thermal part 42 of the temperature measuring element is always in reliable contact with the bottom of the temperature measuring hole 21. This provides an accurate installation benchmark and structural basis for replacing the temperature measuring element 4 online without disassembling the housing, while ensuring temperature measurement accuracy.

[0041] like Figure 4 As shown, in practical use, a method for installing a supercritical CO2 turbine temperature monitoring device for measuring the temperature of the working fluid inside the inner cylinder includes the following steps: A temperature measuring through hole is machined at the temperature measuring part of the inner cylinder 2, and a temperature measuring protective sleeve 22 is fixed in the temperature measuring through hole. A guide hole is machined at the opening of the temperature measuring protective sleeve 22. The insertion through hole 11, the screw hole, and the gasket mounting groove are machined at the corresponding positions of the outer cylinder 1; Assemble the connector mounting base 9 and the temperature measuring device housing 8 into one unit, then insert the temperature measuring device housing 8 into the temperature measuring part of the temperature measuring protective sleeve 22, and connect the flange part 81 of the temperature measuring device housing 8 to the outer cylinder 1 through bolts 84. At the same time, install the metal spiral wound gasket 12 in the gasket mounting groove during the installation process. The total length from the outer end of the measuring connector mounting base 9 to the bottom end of the first receiving cavity of the temperature measuring device housing 8 after the measuring connector mounting base 9 and the temperature measuring device housing 8 are assembled into one unit is denoted as the installation insertion depth L. The temperature sensing element 4 is installed on the connector mounting base 9 via the lead wire connection assembly, and the insertion depth of the temperature sensing element 4 is adjusted to match the measured installation insertion depth L, ensuring that the thermal part 42 of the temperature sensing element is in contact with the bottom of the temperature sensing hole 21.

[0042] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A temperature monitoring device for a supercritical CO2 turbine with online replacement of temperature sensing elements, used in a supercritical CO2 turbine with an inner cylinder and an outer cylinder, characterized in that, Includes the temperature measuring device housing, temperature measuring element, and lead wire connection assembly; The temperature sensing element includes an armored lead body and a temperature sensing element thermistor disposed at the end of the armored lead body; The temperature measuring device housing includes a flange, an insertion section and a connecting section respectively disposed at both axial ends of the flange; the temperature measuring device housing has a first receiving cavity along its axial direction for inserting the armored lead body; the opening of the first receiving cavity is disposed at the end of the connecting section, and its bottom is disposed at the end of the insertion section. The end of the connecting part away from the insertion section is provided with a threaded part, and the threaded part is connected to a connector mounting seat; the connector mounting seat is provided with a fourth through hole for the armored lead body to pass through; One end of the armored lead body is detachably connected to the connector mounting base via a lead connection assembly, and the end with the temperature sensing element is located at the bottom of the first receiving cavity. The insertion section is used to pass through the insertion through hole of the outer cylinder and extend into the temperature measuring hole of the inner cylinder; the flange is detachably connected to the outer cylinder, and the opposite sides of the two are in contact with each other.

2. The supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function according to claim 1, characterized in that, The insertion segment includes a first insertion segment, a second insertion segment, and a third insertion segment, which are progressively smaller in diameter from near to far; the opening extends to the end of the third insertion segment and forms a cavity at the end for accommodating the thermistor of the temperature sensing element; Correspondingly, the temperature measuring hole of the inner cylinder includes a first hole section for the second insertion section to pass through and a second hole section for the third insertion section to be inserted.

3. The supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function according to claim 1, characterized in that, The outer cylinder has a gasket mounting groove on the side away from the inner cylinder and near the insertion through hole. A metal spiral wound gasket is provided in the gasket mounting groove, and the two axial ends of the metal spiral wound gasket abut against the flange and the outer cylinder, respectively.

4. The supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function according to claim 1, characterized in that, The lead wire connection assembly includes a threaded connector, a ferrule, and a ferrule lock nut; the threaded connector is installed at the end of the connector mounting base away from the connection portion.

5. The supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function according to claim 4, characterized in that, The threaded connector includes a stop portion that is annular and larger than the diameter of the threaded section, a threaded section and a ferrule locking threaded section respectively provided at both axial ends of the stop portion, and a second through hole for the axially penetrating threaded section, the stop portion and the ferrule locking threaded section; the threaded section is threadedly connected to the end of the connector mounting base away from the connecting portion, and the second through hole is used for the armored lead body to pass through.

6. The supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function according to claim 4, characterized in that, The ferrule is positioned near the locking thread section of the ferrule on the armored lead wire; the ferrule locking nut has a third through hole through which the armored lead wire body passes, and the ferrule locking nut passes through the third through hole, covers the outside of the ferrule, and is threadedly connected to the locking thread section of the ferrule.

7. The supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function according to claim 1, characterized in that, When the temperature measuring hole of the inner cylinder is a temperature measuring through hole, a temperature measuring protective sleeve is installed in the temperature measuring through hole, and the temperature measuring protective sleeve is used to cover the second and third insertion sections of the insertion section.

8. The supercritical CO2 turbine temperature monitoring device with online temperature sensing element replacement function according to claim 7, characterized in that, The temperature measuring protective sleeve includes a sleeve opening and a sleeve cavity that accommodates the second insertion section and the third insertion section; the sleeve cavity forms a temperature measuring section for accommodating the thermistor of the temperature measuring element. The outer side of the temperature measuring protective sleeve is provided with a limiting protrusion, and correspondingly, the inner cylinder is provided with a limiting groove that cooperates with the limiting protrusion.

9. A method for installing a supercritical CO2 turbine temperature monitoring device as described in any one of claims 1 to 6, used for measuring the metal temperature of the inner cylinder, characterized in that, Includes the following steps: A temperature measuring hole is machined at the temperature measuring part of the inner cylinder, and a guide hole is machined at the opening of the temperature measuring hole; Insertion through holes, screw holes, and gasket mounting slots are machined at corresponding positions on the outer cylinder; Assemble the connector mounting base and the temperature measuring device housing into one unit, then insert the temperature measuring device housing into the temperature measuring hole of the inner cylinder, and connect the flange of the temperature measuring device housing to the outer cylinder with screws. At the same time, install the metal spiral wound gasket in the gasket mounting groove during the installation process. The total length from the outer end of the connector mounting base to the bottom end of the first receiving cavity of the temperature measuring device housing after the connector mounting base and the temperature measuring device housing are assembled into one unit is denoted as the installation insertion depth. Install the temperature sensing element onto the connector mounting base via the lead wire connection assembly, and adjust the insertion depth of the temperature sensing element to match the measured installation insertion depth, ensuring that the thermal part of the temperature sensing element is in contact with the bottom of the temperature sensing hole.

10. A method for installing a supercritical CO2 turbine temperature monitoring device as described in any one of claims 1 to 8, used for measuring the temperature of the working fluid inside the inner cylinder, characterized in that... Includes the following steps: A temperature measuring through hole is machined at the temperature measuring part of the inner cylinder, and a temperature measuring protective sleeve is fixed in the temperature measuring through hole. A guide hole is machined at the opening of the temperature measuring protective sleeve. Insertion through holes, screw holes, and gasket mounting slots are machined at corresponding positions on the outer cylinder; Assemble the connector mounting base and the temperature measuring device housing into one unit, then insert the temperature measuring device housing into the temperature measuring part of the temperature measuring protective sleeve, and connect the flange of the temperature measuring device housing to the outer cylinder with screws. At the same time, install the metal spiral wound gasket in the gasket mounting groove during the installation process. The total length from the outer end of the connector mounting base to the bottom end of the first receiving cavity of the temperature measuring device housing after the connector mounting base and the temperature measuring device housing are assembled into one unit is denoted as the installation insertion depth. Install the temperature sensing element onto the connector mounting base via the lead wire connection assembly, and adjust the insertion depth of the temperature sensing element to match the measured installation insertion depth, ensuring that the thermal part of the temperature sensing element is in contact with the bottom of the temperature sensing hole.

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