Steam pipeline system and steam pipeline crack damage control method

Abstract

The present invention relates to the technical field of steam pipelines, and discloses a steam pipeline system and a method for controlling crack damage in a steam pipeline, wherein the steam pipeline system includes a connected steam generator and a steam pipeline, and also includes a crack control device, the crack control device includes a crack monitoring mechanism and a controller, the crack monitoring mechanism is connected to the steam pipeline and is used to monitor the crack extension of the steam pipeline in real time, the controller is electrically connected to the crack monitoring mechanism and the steam generator respectively, and the controller is used to control the steam generator to adjust the steam dryness in the steam pipeline when the crack monitoring mechanism detects that the crack extension of the steam pipeline exceeds a preset range. The steam pipeline system and the method for controlling crack damage in a steam pipeline provided by the present invention can reduce the crack extension rate of the steam pipeline by adjusting the steam dryness, thereby controlling the crack extension and development of the steam pipeline, which is of great significance to improving the safety and reliability of the steam pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of steam pipelines, and in particular to a steam pipeline system and a method for controlling crack damage in a steam pipeline. Background Art

[0002] With the continuous increase of temperature and pressure parameters of thermal power units at home and abroad, the increase of service time of units in service and the deep peak load regulation of units, thermal power units have repeatedly experienced leakage accidents caused by steam pipe cracks in recent years. Cracks in steam pipes may cause leakage or even rupture, which will cause serious harm. Therefore, emergency control of crack propagation in running steam pipes is of great significance to improving the reliability and safety of steam system operation.

[0003] The existing treatment technologies for steam pipe cracks are mainly aimed at crack prevention and post-damage treatment, and lack of control technology for steam pipe crack expansion. Summary of the invention

[0004] The embodiments of the present invention provide a steam pipeline system and a method for controlling crack damage in a steam pipeline, which are used to solve or partially solve the problem that the existing treatment of steam pipeline cracks lacks a technology for controlling the expansion of steam pipeline cracks.

[0005] An embodiment of the present invention provides a steam pipeline system, including a connected steam generator and a steam pipeline, and also including a crack control device, wherein the crack control device includes a crack monitoring mechanism and a controller, wherein the crack monitoring mechanism is connected to the steam pipeline and is used to monitor the crack extension of the steam pipeline in real time, and the controller is electrically connected to the crack monitoring mechanism and the steam generator respectively, and the controller is used to control the steam generator to adjust the steam dryness in the steam pipeline when the crack monitoring mechanism detects that the crack extension of the steam pipeline exceeds a preset range.

[0006] Based on the above scheme, the crack monitoring mechanism includes a crack sensor and a processor. The crack sensor is connected to the surface of the steam pipe and monitors the crack extension in real time. The processor is electrically connected to the crack sensor and is used to obtain the crack extension size value according to the monitoring result of the crack sensor.

[0007] On the basis of the above solution, the crack monitoring mechanism is arranged at the elbow part and / or the multi-way part of the steam pipeline.

[0008] On the basis of the above solution, a steam dryness meter is further connected to the steam pipeline, and the steam dryness meter is electrically connected to the controller.

[0009] An embodiment of the present invention further provides a method for controlling crack damage in a steam pipeline, the control method comprising: monitoring the crack extension of the steam pipeline in real time; and adjusting the steam dryness in the steam pipeline when the crack extension of the steam pipeline exceeds a preset range.

[0010] On the basis of the above scheme, real-time monitoring of crack growth of the steam pipeline specifically includes: real-time monitoring of the crack size of the steam pipeline; and obtaining the crack growth rate according to the crack size of the steam pipeline.

[0011] On the basis of the above scheme, the crack extension of the steam pipe exceeds the preset range specifically includes: the crack extension rate of the steam pipe is greater than a first preset value.

[0012] On the basis of the above scheme, after adjusting the steam dryness in the steam pipe, it also includes: continuing to monitor the crack extension of the steam pipe in real time; when the crack extension rate of the steam pipe is less than a second preset value, maintaining the current dryness of the steam in the steam pipe; wherein the second preset value is less than the first preset value.

[0013] On the basis of the above scheme, adjusting the steam dryness in the steam pipeline specifically includes: obtaining in advance through experiments the optimal steam dryness value that can make the crack growth rate of the steam pipeline reach the lowest range; and adjusting the dryness of the steam in the steam pipeline according to the optimal steam dryness value.

[0014] On the basis of the above scheme, real-time monitoring of crack propagation of the steam pipeline specifically includes: real-time monitoring of crack propagation at elbows and / or multi-pass parts of the steam pipeline.

[0015] A steam pipeline system and a method for controlling crack damage in a steam pipeline provided by an embodiment of the present invention can obtain the crack extension status of the steam pipeline in real time by setting a crack monitoring mechanism. When the crack extension exceeds an allowable range, a controller is set to control a steam generator to adjust the dryness of steam in the steam pipeline, thereby reducing the crack extension rate of the steam pipeline. This can effectively control the crack extension and development of the steam pipeline and extend the service life of the steam pipeline, which is of great significance to improving the safety and reliability of the steam pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A connection diagram of a steam pipeline system according to an embodiment of the present invention;

[0018] Figure 2 is a graph showing the relationship between steam dryness and crack growth rate in an embodiment of the present invention.

[0019] Description of reference numerals:

[0020] Among them, 1. steam generator; 2. crack sensor; 3. processor; 4. controller; 5. heating power regulator; 6. steam pipeline; 7. delivery pump; 8. steam user; 9. cable; 10. condenser. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] refer to Figure 1 The embodiment of the present invention provides a steam pipeline system, which includes a connected steam generator 1 and a steam pipeline 6, and also includes a crack control device. The crack control device includes a crack monitoring mechanism and a controller 4, wherein the crack monitoring mechanism is connected to the steam pipeline 6 and is used to monitor the crack extension of the steam pipeline 6 in real time. The controller 4 is electrically connected to the crack monitoring mechanism and the steam generator 1 respectively. The controller 4 is used to control the steam generator 1 to adjust the steam dryness in the steam pipeline 6 when the crack monitoring mechanism detects that the crack extension of the steam pipeline 6 exceeds a preset range.

[0024] The steam pipe 6 is a pipe with steam as the flowing medium. Steam is transported to the required location through the steam pipe 6. During operation, the steam pipe 6 may be damaged by cracks due to the pressure of the internal steam, thermal fatigue, etc. This embodiment proposes to set a crack control device to control the crack propagation of the steam pipe 6. Different from the existing technology for preventing crack propagation and repairing after damage, the crack control device in this embodiment is used to control the crack propagation process of the steam pipe 6.

[0025] The crack control device monitors the crack propagation of the steam pipe 6 in real time through the crack monitoring mechanism, and judges the crack propagation of the steam pipe 6 in real time according to the crack situation. Specifically, the crack monitoring mechanism can be used to monitor the crack propagation rate of the steam pipe 6 in real time. The allowable range of the crack propagation rate can be preset. When the crack propagation rate of the steam pipe 6 exceeds the allowable range, the crack control device controls the steam generator 1 to adjust the dryness of the generated steam through the controller 4 to adjust the dryness of the steam in the steam pipe 6. According to the test results, when the steam in the steam pipe 6 is within a certain dryness range, the crack propagation rate of the steam pipe 6 will be significantly reduced. Therefore, by adjusting the dryness of the steam in the steam pipe 6 to reach the dryness range, the continued growth of the crack propagation rate can be effectively controlled, and the control of the crack propagation of the steam pipe 6 can be achieved.

[0026] A steam pipeline system provided in this embodiment can obtain the crack expansion situation of the steam pipe 6 in real time by setting a crack monitoring mechanism. When the crack expansion exceeds the allowable range, the controller 4 is set to control the steam generator 1 to adjust the dryness of the steam in the steam pipe 6 to reduce the crack expansion rate of the steam pipe 6, thereby effectively controlling the crack expansion and development of the steam pipe 6 and extending the service life of the steam pipe 6, which is of great significance to improving the safety and reliability of the steam pipe 6.

[0027] On the basis of the above embodiment, further, the crack monitoring mechanism includes a crack sensor 2 and a processor 3. The crack sensor 2 is connected to the surface of the steam pipe 6 and monitors the crack extension in real time. The processor 3 is electrically connected to the crack sensor 2 and is used to obtain the crack extension size value according to the monitoring result of the crack sensor 2.

[0028] The crack sensor 2 monitors the crack extension in real time at the crack position of the steam pipe 6. The crack sensor 2 is electrically connected to the processor 3 through the cable 9, that is, the signal connection. The crack sensor 2 is installed on the steam pipe 6, and can be specifically connected to the outer surface of the steam pipe 6; the processor 3 is electrically connected to the crack sensor 2 through the cable 9. The processor 3 is electrically connected to the input end of the controller 4 through the cable 9, and the output end of the controller 4 is electrically connected to the steam generator 1 through the cable 9 to control the operating parameters of the steam generator 1.

[0029] A crack sensor 2 can be installed at a key structural position of the steam pipe 6 to monitor the crack expansion in real time. The signal detected by the crack sensor 2 is transmitted to the processor 3 in real time for processing to obtain the crack expansion size value of the corresponding position. The crack expansion rate can be obtained by taking the first-order derivative of the crack expansion size value with respect to time, and the crack expansion rate is sent to the controller 4 in real time.

[0030] When the controller 4 detects that the crack growth rate exceeds a certain value, it determines that the crack growth of the corresponding key structural parts of the steam pipe 6 is aggravated, and the controller 4 sends an adjustment instruction to the steam generator 1, and adjusts the dryness of the steam in the steam pipe 6 by adjusting the dryness of the steam generated by the steam generator 1, so as to reduce the crack growth rate of the steam pipe 6.

[0031] Further, in this embodiment, the crack sensor 2 is a guided wave sensor, and the processor 3 is a guided wave detector. The guided wave detector is used to send an excitation signal and excite an ultrasonic guided wave on the steam pipe 6 through the guided wave sensor. The guided wave sensor is used to collect the echo signal generated by the ultrasonic guided wave reflected at the crack, and send the echo signal to the guided wave detector. The guided wave detector obtains the crack extension size value on the steam pipe 6 based on the echo signal, and obtains the crack extension rate according to the crack extension size value.

[0032] Specifically, the principle of waveguide crack extension detection is to generate elastic waveguide by exciting mechanical vibration in the steam pipe 6. When the waveguide propagates in the steam pipe 6, it encounters cracks on the steam pipe 6, and part of the wave will be reflected back. When the reflected waveguide passes through the waveguide sensor, a magnetostrictive inverse effect occurs, which generates an electrical signal in the waveguide sensor. The waveguide detector collects, processes and analyzes the signal generated in the waveguide sensor, and can detect the crack extension of the pipeline. By comparing and analyzing the characteristics of the transmitted pulse and the characteristics of the echo signal, the crack extension size value on the steam pipe 6 is obtained, and then the crack extension rate is obtained.

[0033] Furthermore, the crack sensor 2 may also be a fiber grating sensor, and the processor 3 may correspond to an optical signal modulator. The optical signal modulator is used to send an optical signal, which is reflected by the fiber grating sensor and transmitted back to the optical signal modulator. The optical signal modulator obtains the crack extension size value on the steam pipe 6 based on the reflected optical signal, and then obtains the crack extension rate.

[0034] The crack monitoring mechanism may be any structure that can monitor and obtain the crack extension size value of the crack site, and is not specifically limited.

[0035] On the basis of the above embodiment, the crack monitoring mechanism is further provided at the elbow and / or multi-pass portion of the steam pipe 6. The multi-pass portion is a multi-pass connection interface portion. The elbow and multi-pass portion of the steam pipe 6 are portions where cracks are prone to propagation. The crack monitoring mechanism may be provided at the elbow and / or multi-pass portion of the steam pipe 6 to focus on monitoring the key portions of the steam pipe 6 and improve the control efficiency and effect.

[0036] Furthermore, when multiple crack monitoring mechanisms are provided at multiple locations of the steam pipe 6 , when any crack monitoring mechanism detects that the crack propagation rate exceeds the allowable range, the steam parameters in the steam pipe 6 can be adjusted by controlling the steam generator 1 .

[0037] On the basis of the above embodiment, further, a steam dryness meter is connected to the steam pipe 6, and the steam dryness meter is electrically connected to the controller 4. The steam pipeline system also includes a steam dryness meter (not shown in the figure) installed on the steam pipe 6, and the steam dryness meter is electrically connected to the controller 4. The steam dryness meter is used to detect the dryness of the steam in the steam pipe 6. The steam dryness meter can adopt a throttling orifice plate dryness meter, a dual conductivity dryness meter, etc., which can be directly purchased from the market, such as SQTK pure steam quality detector, KZP-15 steam dryness detector, etc. By detecting the steam dryness in real time, the adjustment amount of the steam generator 1 can be assisted in control.

[0038] refer to Figure 1 Specifically, the output end of the controller 4 is electrically connected to the heating power regulator 5 of the steam generator 1 through the cable 9 to adjust the steam dryness produced by the steam generator 1. The steam generator 1 can be a coal-fired boiler, a nuclear power steam generator 1, an oil-fired steam generator 1, and the like.

[0039] The steam pipeline system also includes a delivery pump 7 arranged on the steam pipe 6. It also includes a steam user 8 and a condenser 10. The steam pipes 6 are connected to form a circulation loop. The inlet of the steam pipe 6 can be connected to the delivery pump 7, and the outlet of the steam pipe 6 is connected to the corresponding steam user 8. The steam user 8 can be a steam turbine, which can be used for power generation or directly used to drive power machinery by converting the thermal energy of steam into mechanical energy; the steam user 8 can also be a heating user, which directly uses the thermal energy of steam for heating. The used steam or condensate is further cooled by heat exchange through the condenser 10, and the cooled condensate is again transported to the steam generator 1 by the delivery pump 7 to form a steam-condensate circulation system. In addition, the steam system can also be equipped with condensate pumps, deaerators, regenerators and other equipment, and the layout of the steam pipe 6 can be adjusted and designed according to actual conditions. Figure 1 The diagram is for illustrative purposes only.

[0040] On the basis of the above-mentioned embodiment, further, this embodiment provides a method for controlling crack damage of the steam pipe 6, the control method comprising: real-time monitoring of the crack extension of the steam pipe 6; when the crack extension of the steam pipe 6 exceeds a preset range, adjusting the dryness of the steam in the steam pipe 6.

[0041] On the basis of the above embodiment, further, real-time monitoring of crack propagation of the steam pipe 6 specifically includes: real-time monitoring of the crack size of the steam pipe 6; and obtaining the crack propagation rate according to the crack size of the steam pipe 6.

[0042] On the basis of the above embodiment, further, the crack extension of the steam pipe 6 exceeds the preset range specifically includes: the crack extension rate of the steam pipe 6 is greater than a first preset value.

[0043] On the basis of the above embodiment, further, after adjusting the dryness of the steam in the steam pipe 6, it also includes: continuing to monitor the crack propagation of the steam pipe 6 in real time; when the crack propagation rate of the steam pipe 6 is less than the second preset value, maintaining the current dryness of the steam in the steam pipe 6. That is, after the dryness of the steam in the steam pipe 6 is adjusted when the crack propagation rate of the steam pipe 6 is greater than the first preset value, the crack propagation rate of the steam pipe 6 is continued to be monitored, and when the crack propagation rate decreases to less than the second preset value, the adjustment of the dryness of the steam in the steam pipe 6 can be stopped, and the current steam dryness can be maintained. Among them, the second preset value is less than the first preset value.

[0044] According to the test, when the dryness of the steam in the steam pipe 6 is within a certain range, the crack growth rate of the key parts of the steam pipe 6 will be significantly reduced. The crack monitoring mechanism of the steam pipe 6 monitors the crack growth rate of the key structural parts and transmits the crack growth rate value to the controller 4. When the crack growth rate value suddenly increases to exceed the first preset value, it indicates that the crack growth of the steam pipe 6 is aggravated. The controller 4 sends a dryness adjustment instruction to the steam generator 1. When the crack growth rate of the key structural parts of the steam pipe 6 is reduced to a permissible stable value, that is, reduced to below the second preset value, the dryness adjustment is stopped.

[0045] On the basis of the above embodiment, further, adjusting the dryness of the steam in the steam pipe 6 specifically includes: obtaining in advance through experiments the optimal steam dryness value that can make the crack growth rate of the steam pipe 6 reach the lowest range; and adjusting the dryness of the steam in the steam pipe 6 according to the optimal steam dryness value.

[0046] On the basis of the above embodiment, further, real-time monitoring of crack propagation of the steam pipe 6 specifically includes: real-time monitoring of crack propagation at elbows and / or multi-pass parts of the steam pipe 6.

[0047] Due to the multiple working conditions and complex system of the steam pipeline 6, the steam dryness value for significantly reducing the crack growth rate of the steam pipeline 6 will change with the working conditions and is not a fixed value. That is, with the different specific operating conditions of the steam pipeline 6, the optimal steam dryness value that can reduce the crack growth rate of the steam pipeline 6 to the lowest range is also different, that is, the steam with the same dryness value has different effects on reducing the crack growth rate of the steam pipeline 6 under different working conditions. In order to reduce the crack growth rate of the steam pipeline 6 under different working conditions to the lowest range, the required steam dryness value is different.

[0048] Figure 2 The figure shows the relationship between the steam dryness and the crack growth rate of the steam pipe 6 under a specific working condition. According to the test results, it can be seen that under this working condition, the crack growth rate of the steam pipe 6 can be significantly reduced by increasing the steam dryness from 60%. After the steam dryness increases to a certain value, the crack growth rate will rebound as the steam dryness continues to increase. However, there is an optimal steam dryness value range that can make the crack growth rate of the steam pipe 6 reach the lowest. By reasonably adjusting the steam dryness, the crack growth of the steam pipe 6 can be effectively suppressed.

[0049] This embodiment proposes that the influence of steam dryness on the crack growth rate of the steam pipe 6 under different working conditions can be studied in advance through experiments. The optimal steam dryness values ​​corresponding to the crack growth rate of the steam pipe 6 reaching the lowest range under different working conditions are obtained. The optimal steam dryness value can also be a range. Then, when the steam pipe 6 is actually in operation, the dryness of the steam in the steam pipe 6 is controlled and adjusted according to the optimal steam dryness value corresponding to the actual operating condition and the real-time dryness of the steam in the actual operating condition.

[0050] Specifically, when the real-time steam dryness in the steam pipe 6 is greater than the optimal steam dryness value, the steam dryness in the steam pipe 6 is reduced; when the real-time steam dryness in the steam pipe 6 is less than the optimal steam dryness value, the steam dryness in the steam pipe 6 is increased.

[0051] On the basis of the above embodiments, further, this embodiment aims at the deficiencies of the existing steam pipe 6 crack extension control technology and means, and proposes a steam pipe 6 crack extension emergency control device. The control device is particularly suitable for the main steam pipe. The steam pipe 6 crack extension emergency control device mainly includes a steam pipe 6 crack monitoring mechanism and a controller 4; the crack extension emergency control device is connected to the steam pipe 6. The crack monitoring mechanism includes a crack sensor 2 and a processor 3, the crack sensor 2 is connected to the steam pipe 6, and the processor 3 is electrically connected to the crack sensor 2; the output end of the processor 3 is electrically connected to the input end of the controller 4, and the output end of the controller 4 is electrically connected to the heating power regulator 5 of the steam generator 1.

[0052] refer to Figure 1 The present embodiment provides a steam pipeline system, i.e., a pipeline system using steam as a medium. The steam pipeline system includes a steam generator 1, a steam pipeline 6, and a steam user 8, wherein the steam pipeline 6 is provided with a crack propagation emergency control device. The steam pipeline system also includes a delivery pump 7. The delivery pump 7 is used to deliver steam. The steam pipeline 6 flows through the steam user 8. The crack propagation emergency control device can be provided on the steam pipeline 6 between the steam generator 1 and the steam user 8.

[0053] The processor 3 in the crack monitoring mechanism of the steam pipe 6 is connected to the crack sensor 2 through the cable 9, and the crack extension size of the key structural part of the steam pipe 6 is obtained. The crack extension rate of the key structural part of the steam pipe 6 can be obtained by taking the first-order derivative of the crack extension size of the key structural part of the steam pipe 6 with respect to time. When the crack extension rate of the key structural part of the steam pipe 6 suddenly increases, it is determined that the crack extension of the key structural part of the steam pipe 6 is aggravated, and a steam dryness adjustment signal is transmitted to the controller 4, and the controller 4 sends a dryness adjustment instruction to the steam generator 1, and the steam dryness is adjusted according to the requirements. When the crack extension rate of the key structural part of the steam pipe 6 is reduced to the permitted stable value, the crack monitoring mechanism of the steam pipe 6 transmits a signal to stop adjusting the dryness to the controller 4, and the controller 4 sends an instruction to stop adjusting the dryness to the steam generator 1.

[0054] When the dryness of the steam in the steam pipe 6 is within a certain range, the crack growth rate of the steam pipe 6 can be significantly reduced, thereby achieving emergency control of the crack growth rate of the steam pipe 6 and improving the reliability and safety of the steam pipe 6.

[0055] Since the rupture of the steam pipe 6 will cause serious harm, emergency control of the crack growth rate of the running steam pipe 6 is of great significance to improving the reliability and safety of the steam system operation. The supercritical carbon dioxide powered steam pipe 6 structural safety control device and method are combined with the steam pipe 6 crack size monitoring technology. By adjusting the steam dryness in the steam pipe 6, the crack growth rate of the steam pipe 6 can be significantly reduced, the crack growth development of the steam pipe 6 can be effectively controlled, the service life of the steam pipe 6 can be extended, and the safety and reliability of the steam pipe 6 can be improved.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam pipeline system, comprising a connected steam generator and a steam pipeline, characterized in that: It also includes a crack control device, the crack control device includes a crack monitoring mechanism and a controller, the crack monitoring mechanism is connected to the steam pipeline and is used to monitor the crack extension of the steam pipeline in real time, the controller is electrically connected to the crack monitoring mechanism and the steam generator respectively, and the controller is used to control the steam generator to adjust the steam dryness in the steam pipeline when the crack monitoring mechanism detects that the crack extension of the steam pipeline exceeds a preset range; The crack monitoring mechanism is arranged at a key structural position to monitor the crack growth rate of the key structural position; the controller is configured as follows: when it is detected that the crack growth rate exceeds a certain value, it is determined that the crack growth of the corresponding key structural position of the steam pipeline is aggravated, and the controller sends an adjustment instruction to the steam generator, and adjusts the dryness of the steam in the steam pipeline by adjusting the dryness of the steam generated by the steam generator, so as to reduce the crack growth rate of the steam pipeline.

2. The steam pipeline system according to claim 1, characterized in that: The crack monitoring mechanism includes a crack sensor and a processor. The crack sensor is connected to the surface of the steam pipe and monitors crack extension in real time. The processor is electrically connected to the crack sensor and is used to obtain a crack extension size value according to the monitoring result of the crack sensor.

3. The steam pipeline system according to claim 1, characterized in that: The crack monitoring mechanism is arranged at the elbow portion and / or the multi-pass portion of the steam pipeline.

4. The steam pipeline system according to claim 1, characterized in that: The steam pipeline is also connected to a steam dryness meter, and the steam dryness meter is electrically connected to the controller.

5. A method for controlling crack damage in a steam pipeline, characterized in that: Using the steam pipeline system according to any one of claims 1 to 4, the control method comprises: Real-time monitoring of crack growth in steam pipes; When the crack of the steam pipe expands beyond a preset range, the steam dryness in the steam pipe is adjusted.

6. The method for controlling crack damage in a steam pipeline according to claim 5, characterized in that: Real-time monitoring of crack growth in steam pipes specifically includes: Real-time monitoring of crack size in steam pipes; The crack growth rate is obtained according to the crack size of the steam pipe.

7. The method for controlling crack damage in a steam pipeline according to claim 5, characterized in that: The crack extension of the steam pipe beyond the preset range specifically includes: The crack growth rate of the steam pipe is greater than a first preset value.

8. The method for controlling crack damage in a steam pipeline according to claim 7, characterized in that: After adjusting the steam dryness in the steam pipeline, it also includes: Continue to monitor crack growth in steam pipes in real time; When the crack growth rate of the steam pipeline is less than a second preset value, maintaining the current dryness of the steam in the steam pipeline; The second preset value is smaller than the first preset value.

9. The method for controlling crack damage in a steam pipeline according to claim 5, characterized in that: Adjusting the steam dryness in the steam pipeline specifically includes: The optimal steam dryness value that can make the crack growth rate of the steam pipeline reach the lowest range is known in advance through experiments; The dryness of steam in the steam pipeline is adjusted according to the optimal steam dryness value.

10. The method for controlling crack damage in a steam pipeline according to claim 5, characterized in that: Real-time monitoring of crack growth in steam pipes specifically includes: Real-time monitoring of crack propagation at elbows and / or multi-pass locations of steam pipes.

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