Method and device for monitoring bent pipe state of boiler main steam pipeline

Abstract

The invention discloses a boiler main steam pipeline elbow state monitoring method and device, and relates to the field of elbow state monitoring, a temperature sensor is arranged to detect the temperature of an elbow, the monitored temperature is applied to a main steam pipeline elbow temperature-stress model, and the stress condition of the whole area of the elbow is obtained through simulation; the strain sensor is used for monitoring the strain and stress conditions at the mounting position of the sensor, the simulated overall stress and the monitored local stress are compared with respective corresponding stress threshold values, and meanwhile, the monitored strain is compared with the corresponding strain threshold value, so that the stress condition of the bent pipe is judged to determine the state of the bent pipe; the stress strain of the bent pipe can be accurately monitored in real time, so that the stress condition of the bent pipe is accurately determined, and the stress condition of the bent pipe is adjusted in time.

Description

Technical Field

[0001] The present application relates to the field of pipe bend status monitoring, and in particular to a method and device for monitoring the pipe bend status of a boiler main steam pipeline. Background Art

[0002] Today, the development trend of thermal power boiler units is large capacity, high parameters and supercritical. In order to ensure the safe and reliable operation of the unit equipment and improve production efficiency and economic benefits, high-temperature and high-pressure pipeline materials are required to have excellent performance, especially high-temperature creep performance and stress corrosion resistance of pipeline materials. In the actual operation of the boiler, the pipeline will be displaced and stressed due to thermal expansion and contraction. In the actual operation of coal-fired power plants, the pipeline will produce great stress, exceeding the limit of the pipeline. In order to ensure safe operation, elbows are needed to absorb the axial expansion displacement of the pipe and withstand the impact of the fluid in the pipe, which makes the elbows very easy to be damaged.

[0003] At present, during the operation of domestic power plants, the methods for monitoring the main steam pipeline are lead drop test and micrometer test. The test results are easily affected by external factors such as the environment, and the accuracy is difficult to guarantee. In addition, it is impossible to obtain real-time data statistics, analysis and storage. There is a lack of real-time online monitoring and analysis monitoring system, which makes it impossible to make real-time adjustments. Summary of the invention

[0004] The purpose of this application is to provide a method and device for monitoring the status of a boiler main steam pipe elbow, which can monitor the stress and strain of the elbow in real time and accurately, so as to accurately determine the stress condition of the elbow so as to adjust the stress condition of the elbow in time.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a device for monitoring the state of a main steam pipe elbow of a boiler, comprising: a temperature sensor, a strain sensor, a data acquisition module and a host computer;

[0007] The temperature sensor is arranged at a first preset position of the bent pipe to be monitored, and is used to collect the temperature at the first preset position of the bent pipe to be monitored;

[0008] The strain sensor is disposed at a second preset position of the bent pipe to be monitored, and is used to collect strain and stress at the second preset position of the bent pipe to be monitored;

[0009] The data acquisition module is connected to the temperature sensor, the strain sensor and the host computer respectively, and is used to receive the temperature collected by the temperature sensor and the strain and stress collected by the strain sensor, and upload the temperature, strain and stress to the host computer;

[0010] The host computer is used to import the received temperature into the temperature-stress model of the main steam pipeline elbow, obtain the simulated stress of the entire area of ​​the elbow to be monitored, and determine the state of the elbow to be monitored based on the collected stress, strain and simulated stress.

[0011] Optionally, the host computer includes: a simulation model building unit, a stress analysis unit, a stress comparison unit and a state analysis unit;

[0012] The simulation model building unit is used to build the temperature-stress model of the main steam pipeline elbow according to the physical model of the elbow to be monitored;

[0013] The stress analysis unit is used to import the temperature collected by the temperature sensor into the temperature-stress model of the main steam pipeline elbow to obtain the simulated stress of the entire area of ​​the elbow to be monitored;

[0014] The stress comparison unit is used to compare the simulated stress and the collected stress with the corresponding preset stress thresholds, and to compare the collected strain with the preset strain threshold;

[0015] The state analysis unit is used to regard the monitored elbow as being in a dangerous state if the simulated stress exceeds the corresponding preset stress threshold, or the collected stress exceeds the corresponding preset stress threshold, or the collected strain exceeds the preset strain threshold.

[0016] Optionally, the boiler main steam pipe bend state monitoring device also includes: a stress adjustment module; the stress adjustment module is connected to the host computer and is used to adjust the stress condition of the bend to be monitored according to the stress size exceeding a preset stress threshold or the strain size exceeding a strain threshold when the bend to be monitored is in a dangerous state.

[0017] Optionally, the stress adjustment module includes a spring support and an electric adjuster;

[0018] The electric regulator is connected to the host computer and is used to receive the adjustment signal output by the host computer, and adjust the spring expansion and contraction amount of the spring support and hanger according to the adjustment signal to change the stress condition of the bent pipe to be monitored; the adjustment signal is determined by the host computer according to the stress magnitude exceeding the preset stress threshold and the strain magnitude exceeding the preset strain threshold;

[0019] The spring support hanger is used to suspend the bent pipe to be monitored.

[0020] Optionally, the temperature sensor is arranged at the connection between the straight pipe and the curved pipe of the main steam pipeline.

[0021] Optionally, the strain sensors are arranged at the inner edge, outer edge and side edge of the bent pipe to be monitored.

[0022] In a second aspect, the present application provides a method for monitoring the state of a main steam pipe elbow of a boiler, comprising:

[0023] Obtaining the strain and stress collected by the strain sensor arranged on the bent pipe to be monitored and the temperature collected by the temperature sensor;

[0024] The collected temperature is introduced into the temperature-stress model of the main steam pipeline elbow to obtain the simulated stress of the elbow to be monitored;

[0025] The state of the bent pipe to be monitored is determined based on the collected stress, strain and simulated stress.

[0026] Optionally, the boiler main steam pipe elbow status monitoring method further includes:

[0027] When the bent pipe to be monitored is in a dangerous state, the stress condition of the bent pipe to be monitored is adjusted according to the stress magnitude exceeding a preset stress threshold or the strain magnitude exceeding a strain threshold.

[0028] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-mentioned method for monitoring the status of a bend in a main steam pipe of a boiler.

[0029] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for monitoring the status of a bend in a main steam pipe of a boiler.

[0030] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0031] The present application provides a method and device for monitoring the state of a bend in a main steam pipeline of a boiler. A temperature sensor is set to detect the temperature of the bend, and the monitored temperature is applied to the temperature-stress model of the bend of the main steam pipeline to simulate the stress condition of the entire area of ​​the bend. A strain sensor is used to detect the strain and stress condition at the sensor installation position, and the simulated overall stress and the monitored local stress are compared with their respective corresponding stress thresholds. At the same time, the monitored strain is compared with the corresponding strain threshold, so as to judge the stress condition of the bend to determine the state of the bend. The present application can monitor the stress and strain of the bend in real time and accurately, so as to accurately determine the stress condition of the bend, so as to adjust the stress condition of the bend in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a device for monitoring the state of a main steam pipe elbow of a boiler provided in Example 1 of the present application;

[0034] Figure 2 A schematic diagram of the installation positions of the temperature sensor and the strain sensor provided in Example 1 of the present application;

[0035] Figure 3 A schematic diagram of the regulation principle of the stress regulation module provided in Example 1 of the present application;

[0036] Figure 4 A schematic diagram of the installation of a spring support and hanger provided in Example 1 of the present application;

[0037] Figure 5 A schematic flow chart of a method for monitoring the state of a main steam pipe elbow of a boiler provided in Example 1 of the present application;

[0038] Figure 6 A schematic diagram of a technical route for a method for monitoring the state of a main steam pipe elbow of a boiler provided in Example 2 of the present application;

[0039] Figure 7 A schematic diagram of the structure of a computer device provided in Example 3 of the present application.

[0040] Figure numerals: 1-temperature sensor, 2-strain sensor, 3-data acquisition module, 4-host computer, 5-electric regulator, 6-spring support bracket, 7-extension monitoring sensor. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] Example 1

[0044] This embodiment provides a device for monitoring the state of a main steam pipe elbow of a boiler. Figure 1 As shown, the boiler main steam pipe elbow state monitoring device includes: a temperature sensor 1, a strain sensor 2, a data acquisition module 3 and a host computer 4.

[0045] The temperature sensor 1 is disposed at a first preset position of the bend to be monitored, and is used to collect the temperature at the first preset position of the bend to be monitored. Figure 2 As shown, as an example, the temperature sensor 1 is arranged at the connection between the straight pipe and the curved pipe of the main steam pipeline. Figure 2 In FIG. 1 , a, b, c, and d are temperature measurement points, i.e., the installation positions of the temperature sensor 1. The temperature measurement points are located at the inlet and outlet of the elbow and are used to measure the temperature of the inlet and outlet of the elbow. As an example, the temperature sensor 1 can use a high-temperature thermocouple to measure the temperature of the elbow.

[0046] The strain sensor 2 is disposed at a second preset position of the bend to be monitored, and is used to collect the strain and stress at the second preset position of the bend to be monitored. Figure 2 As shown, as an example, the strain sensor 2 is arranged at the inner edge, outer edge and two side edges of the bent pipe to be monitored. Figure 2 In the figure, e and f are the installation positions of strain sensors 2. The strain sensors 2 are arranged vertically and horizontally to collect stress and strain values ​​acting on the main steam pipeline elbow along the X, Y and Z directions to ensure that the monitoring data can fully reflect the actual situation and strain of the elbow.

[0047] The data acquisition module 3 (wireless data acquisition module) is respectively connected (communication connection) to the temperature sensor 1, the strain sensor 2 and the host computer 4, and is used to receive the temperature collected by the temperature sensor 1 and the strain and stress collected by the strain sensor 2, and upload the temperature, strain and stress to the host computer 4.

[0048] The host computer 4 is used to import the received temperature into the temperature-stress model of the main steam pipe elbow to perform stress simulation, obtain the simulated stress of the entire area of ​​the elbow to be monitored, and determine the state of the elbow to be monitored based on the collected stress, strain and simulated stress.

[0049] The present application installs a temperature sensor 1 and a strain sensor 2 at a specific position of the main steam pipeline bend to monitor the temperature, strain and stress of the boiler bend in real time online, and imports the temperature into the temperature-stress model of the main steam pipeline bend to simulate the overall force of the bend. Through multiple monitoring of temperature, stress and strain, it is determined and analyzed whether the bend is in a dangerous state; if it is in a dangerous state, the bend position is adjusted in time to improve the stress condition.

[0050] As an optional implementation, the host computer 4 includes: a simulation model building unit, a stress analysis unit, a stress comparison unit and a state analysis unit.

[0051] The simulation model building unit is used to build the temperature-stress model of the main steam pipeline elbow according to the physical model of the elbow to be monitored.

[0052] The temperature-stress model of the main steam pipe elbow should be constructed according to the material and specification of the corresponding elbow of the main steam pipe. The geometric model should be constructed with a 1:1 ratio. The boundary conditions should be input for long-term operation conditions to simulate the stress field of the boiler elbow. The temperature-stress model of the elbow should be corrected in combination with the data monitored by temperature sensor 1 and strain sensor 2. Stress simulation should be performed through the elbow temperature-stress model to determine the stress concentration area of ​​the elbow, and monitoring and early warning should be carried out in the stress concentration area.

[0053] The stress analysis unit is used to import the temperature collected by the temperature sensor 1 into the temperature-stress model of the main steam pipe elbow to obtain the simulated stress of the entire area of ​​the elbow to be monitored.

[0054] The stress comparison unit is used to compare the simulated stress and the collected stress with the corresponding preset stress thresholds, and to compare the collected strain with the preset strain threshold.

[0055] The state analysis unit is used to determine that the pipe bend to be monitored is in a dangerous state if the simulated stress exceeds the corresponding preset stress threshold, or the collected stress exceeds the corresponding preset stress threshold, or the collected strain exceeds the preset strain threshold. If both the stress and the strain do not exceed the corresponding safety threshold, the pipe bend is considered to be in a safe operating state.

[0056] When the bend is in a dangerous state, it is necessary to adjust the stress condition of the bend of the main steam pipe through the control and adjustment module. In order to achieve the stress adjustment of the bend to be monitored, in the present application, the boiler main steam pipe bend state monitoring device also includes: a stress adjustment module. The stress adjustment module is connected to the host computer 4 (communication connection), and is used to adjust the stress condition of the bend to be monitored according to the stress exceeding the preset stress threshold or the strain exceeding the strain threshold when the bend to be monitored is in a dangerous state.

[0057] As an optional implementation, Figure 3 As shown, the stress adjustment module includes a spring support bracket 6 and an electric adjuster 5.

[0058] The electric regulator 5 is connected to the host computer 4 and is used to receive the adjustment signal output by the host computer 4, and adjust the spring expansion and contraction amount of the spring support and hanger 6 according to the adjustment signal to change the stress condition of the bent pipe to be monitored; the adjustment signal is determined by the host computer 4 according to the stress magnitude exceeding the preset stress threshold and the strain magnitude exceeding the preset strain threshold. The stress magnitude of the preset stress threshold refers to the collected stress magnitude exceeding the preset stress threshold corresponding to the collected stress or the simulated stress magnitude exceeding the preset stress threshold corresponding to the simulated stress.

[0059] The spring support and hanger 6 is used to suspend the bent pipe to be monitored. The electric regulator is connected to the spring of the spring support and hanger, and the spring is connected to the structural member of the support and hanger through a screw rod or a bolt.

[0060] like Figure 4 As shown, a schematic diagram of the spring support hanger 6 suspending the main steam pipe is shown. The support hanger of the spring support hanger 6 is installed in the horizontal straight pipe position, and the vertical straight pipe is in a fixed state. When the elbow is monitored to be in a dangerous state, the upper computer 4 sends an adjustment signal to the stress adjustment module. When the boiler is running and the temperature rises, the elbow is deformed due to expansion, and the stress and strain exceed the standard. According to the stress and strain exceeding the safety threshold, the expansion and contraction amount of the spring of the spring support hanger 6 is controlled to adjust the stress state of the elbow until the stress state is within a safe range.

[0061] When the stress adjustment module is working, the upper computer 4 sends an adjustment signal to the electric regulator 5, and the electric regulator 5 controls the spring support and hanger 6. The electric regulator 5 is composed of a motor, a transmission device and a feedback device (extension monitoring sensor 7). After the electric regulator 5 receives the adjustment signal from the upper computer 4, the electric regulator 5 drives the transmission device to operate through the rotation of the motor, and adjusts the extension and contraction of the spring support and hanger 6 according to the adjustment signal. During adjustment, the extension and contraction of each spring support and hanger 6 (generally multiple spring support and hangers 6 are installed on the pipeline) is monitored by the extension and contraction monitoring sensor 7, and fed back to the upper computer 4. When the control requirement of the extension and contraction is met, it stops, and then the state of the bent pipe is monitored according to the temperature, stress and strain that continue to be collected. If it is still in a dangerous state, continue to adjust the extension and contraction of the spring support and hanger 6 until the bent pipe is in a safe operating state. The adjustment signal can be regarded as being sent by the state analysis unit of the upper computer.

[0062] In this embodiment, by installing a temperature sensor 1 and a strain sensor 2 at the elbow of the boiler main steam pipeline, the temperature and stress-strain state of the elbow are monitored in real time, and the overall stress of the elbow is analyzed according to the elbow material specifications combined with the numerical model (elbow temperature-stress model), ensuring that the stress and strain of the elbow exceeds the theoretical safety threshold in time and an early warning is issued, and the stress position of the elbow is adjusted by the spring support bracket 6 to improve the stress state of the elbow. Through real-time monitoring, real-time data can be provided to help engineering personnel understand the stress and deformation status of the elbow in time, and realize the safe operation of the elbow of the boiler main steam pipeline.

[0063] Example 2

[0064] This embodiment provides a method for monitoring the state of a main steam pipe bend in a boiler, the execution subject is a host computer 4, such as Figure 5 and Figure 6 As shown, the method for monitoring the state of the elbow of the main steam pipe of the boiler includes:

[0065] S1: Obtain the strain and stress collected by the strain sensor 2 arranged on the bent pipe to be monitored and the temperature collected by the temperature sensor 1.

[0066] The temperature sensor 1 and the strain sensor 2 transmit the real-time status data of the elbow when the boiler is running to the wireless data acquisition module. The wireless data acquisition module uploads the collected temperature, stress and strain data to the host computer 4.

[0067] S2: The collected temperature is introduced into the temperature-stress model of the main steam pipeline elbow to obtain the simulated stress of the elbow to be monitored.

[0068] Modeling is carried out according to the specifications and materials of the main steam pipe elbow, and the boundary conditions under different boiler load conditions are simulated to obtain the temperature-stress model of the main steam pipe elbow.

[0069] S3: Determine the state of the bent pipe to be monitored according to the collected stress, strain and simulated stress.

[0070] The host computer 4 stores theoretical stress thresholds (preset stress thresholds) and theoretical strain thresholds (preset strain thresholds) corresponding to different temperatures of the elbows on the steam pipeline.

[0071] The host computer 4 stores the temperature and stress-strain data uploaded by the wireless data acquisition module, and automatically cleans it up at regular intervals to ensure the normal operation of the control platform. It also compares the stress and strain with the theoretical stress threshold and theoretical strain threshold at the corresponding temperature to determine the working state of the elbow. If it is found that the theoretical stress value or strain value is exceeded, the boiler elbow enters a dangerous state and the elbow stress adjustment operation is started.

[0072] Therefore, when the elbow to be monitored is in a dangerous state, the method for monitoring the state of the elbow of the boiler main steam pipeline further includes:

[0073] S4: When the bent pipe to be monitored is in a dangerous state, the stress condition of the bent pipe to be monitored is adjusted according to the stress magnitude exceeding a preset stress threshold and the strain magnitude exceeding a strain threshold.

[0074] The stress adjustment module adjusts the stress state of the main steam pipe elbow according to the adjustment instruction of the host computer 4, improves the area where the stress of the elbow is concentrated, and after adjusting the stress of the elbow, the host computer 4 compares the temperature, stress and strain data changes transmitted by the wireless data acquisition module before and after the adjustment to confirm whether the elbow is out of the dangerous state. If it is in the dangerous state, continue to adjust it through the stress adjustment module. If the elbow is in a safe operation state, stop adjusting. The host computer 4 saves the temperature, stress and strain data of the elbow before and after the dangerous state for later analysis and research.

[0075] Example 3

[0076] This embodiment provides a computer device, which may be a server or a terminal. Its internal structure diagram may be as follows: Figure 7 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store real-time collected temperature, stress and strain data and bend state data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the above-mentioned method for monitoring the state of a boiler main steam pipe bend is implemented.

[0077] Those skilled in the art will understand that Figure 7The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0078] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the method for monitoring the state of a main steam pipe bend in a boiler is implemented.

[0079] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0080] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0081] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A boiler main steam pipe elbow status monitoring device, characterized in that: The boiler main steam pipeline elbow state monitoring device comprises: a temperature sensor, a strain sensor, a data acquisition module and a host computer; The temperature sensor is arranged at a first preset position of the bent pipe to be monitored, and is used to collect the temperature at the first preset position of the bent pipe to be monitored; The strain sensor is disposed at a second preset position of the bent pipe to be monitored, and is used to collect strain and stress at the second preset position of the bent pipe to be monitored; The data acquisition module is connected to the temperature sensor, the strain sensor and the host computer respectively, and is used to receive the temperature collected by the temperature sensor and the strain and stress collected by the strain sensor, and upload the temperature, strain and stress to the host computer; The host computer is used to import the received temperature into the temperature-stress model of the main steam pipeline elbow, obtain the simulated stress of the entire area of ​​the elbow to be monitored, and determine the state of the elbow to be monitored based on the collected stress, strain and simulated stress.

2. The boiler main steam pipe elbow state monitoring device according to claim 1 is characterized in that: The host computer includes: a simulation model building unit, a stress analysis unit, a stress comparison unit and a state analysis unit; The simulation model building unit is used to build the temperature-stress model of the main steam pipeline elbow according to the physical model of the elbow to be monitored; The stress analysis unit is used to import the temperature collected by the temperature sensor into the temperature-stress model of the main steam pipeline elbow to obtain the simulated stress of the entire area of ​​the elbow to be monitored; The stress comparison unit is used to compare the simulated stress and the collected stress with the corresponding preset stress thresholds, and to compare the collected strain with the preset strain threshold; The state analysis unit is used to regard the monitored elbow as being in a dangerous state if the simulated stress exceeds the corresponding preset stress threshold, or the collected stress exceeds the corresponding preset stress threshold, or the collected strain exceeds the preset strain threshold.

3. The boiler main steam pipe elbow state monitoring device according to claim 2 is characterized in that: The boiler main steam pipe elbow state monitoring device also includes: a stress adjustment module; the stress adjustment module is connected to the host computer and is used to adjust the stress condition of the monitored elbow according to the stress magnitude exceeding the preset stress threshold and the strain magnitude exceeding the strain threshold when the monitored elbow is in a dangerous state.

4. The boiler main steam pipe elbow state monitoring device according to claim 3 is characterized in that: The stress adjustment module includes a spring support and hanger and an electric adjuster; The electric regulator is connected to the host computer and is used to receive the adjustment signal output by the host computer, and adjust the spring expansion and contraction amount of the spring support and hanger according to the adjustment signal to change the stress condition of the bent pipe to be monitored; the adjustment signal is determined by the host computer according to the stress magnitude exceeding the preset stress threshold and the strain magnitude exceeding the preset strain threshold; The spring support hanger is used to suspend the bent pipe to be monitored.

5. The boiler main steam pipe elbow state monitoring device according to claim 1 is characterized in that: The temperature sensor is arranged at the connection between the straight pipe and the curved pipe of the main steam pipeline.

6. The boiler main steam pipe elbow state monitoring device according to claim 1, characterized in that: The strain sensors are arranged at the inner edge, outer edge and side edge of the bent pipe to be monitored.

7. A method for monitoring the state of a boiler main steam pipe elbow, characterized in that: The method for monitoring the state of a main steam pipe elbow of a boiler comprises: Obtaining the strain and stress collected by the strain sensor arranged on the bent pipe to be monitored and the temperature collected by the temperature sensor; The collected temperature is introduced into the temperature-stress model of the main steam pipeline elbow to obtain the simulated stress of the elbow to be monitored; The state of the bent pipe to be monitored is determined based on the collected stress, strain and simulated stress.

8. The method for monitoring the state of a main steam pipe elbow of a boiler according to claim 7, characterized in that: The method for monitoring the state of a main steam pipe elbow of a boiler further comprises: When the bent pipe to be monitored is in a dangerous state, the stress condition of the bent pipe to be monitored is adjusted according to the stress magnitude exceeding a preset stress threshold or the strain magnitude exceeding a strain threshold.

9. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for monitoring the status of the main steam pipe bend of the boiler as described in claim 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for monitoring the state of the main steam pipe bend of the boiler as claimed in claim 7 is implemented.

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