阅读说明：本技术 蒸汽管路系统及蒸汽管道裂纹损伤控制方法 (Steam pipeline system and steam pipeline crack damage control method ) 是由 劳星胜 林原胜 柳勇 赵振兴 柯志武 柯汉兵 戴春辉 张克龙 代路 吴君 吕伟剑 于 2020-05-28 设计创作，主要内容包括：本发明涉及蒸汽管路技术领域,公开了一种蒸汽管路系统及蒸汽管道裂纹损伤控制方法,其中蒸汽管路系统包括相连的蒸汽发生器和蒸汽管道,还包括裂纹控制装置,裂纹控制装置包括裂纹监测机构和控制器,裂纹监测机构连接于蒸汽管道、用于对蒸汽管道的裂纹扩展进行实时监测,控制器与裂纹监测机构和蒸汽发生器分别电连接,控制器用于在裂纹监测机构监测到蒸汽管道的裂纹扩展超出预设范围时控制蒸汽发生器对蒸汽管道内的蒸汽干度进行调节。本发明提供的一种蒸汽管路系统及蒸汽管道裂纹损伤控制方法,通过调节蒸汽干度可降低蒸汽管道的裂纹扩展速率,从而可控制蒸汽管道的裂纹扩展发展,对提高蒸汽管道的安全可靠性具有重要意义。(The invention relates to the technical field of steam pipelines, and discloses a steam pipeline system and a steam pipeline crack damage control method, wherein the steam pipeline system comprises a steam generator and a steam pipeline which are connected, and further comprises a crack control device, the crack control device comprises a crack monitoring mechanism and a controller, the crack monitoring mechanism is connected to the steam pipeline and used for monitoring crack propagation of the steam pipeline in real time, the controller is electrically connected with the crack monitoring mechanism and the steam generator respectively, and the controller is used for controlling the steam generator to adjust the steam dryness in the steam pipeline when the crack monitoring mechanism monitors that the crack propagation of the steam pipeline exceeds a preset range. According to the steam pipeline system and the steam pipeline crack damage control method, provided by the invention, the crack propagation rate of the steam pipeline can be reduced by adjusting the steam dryness, so that the crack propagation development of the steam pipeline can be controlled, and the steam pipeline crack damage control method has important significance for improving the safety and reliability of the steam pipeline.)

1. The steam pipeline system comprises a steam generator and a steam pipeline which are connected, and is characterized by further comprising a crack control device, wherein the crack control device comprises a crack monitoring mechanism and a controller, the crack monitoring mechanism is connected to the steam pipeline and used for monitoring crack propagation of the steam pipeline in real time, the controller is electrically connected with the crack monitoring mechanism and the steam generator respectively, and the controller is used for controlling the steam generator to adjust the steam dryness in the steam pipeline when the crack monitoring mechanism monitors that the crack propagation of the steam pipeline exceeds a preset range.

2. The vapor pipe system according to claim 1, wherein the crack monitoring mechanism comprises a crack sensor and a processor, the crack sensor is connected to the surface of the vapor pipe and monitors the crack propagation in real time, and the processor is electrically connected to the crack sensor and is used for obtaining a crack propagation size value according to the monitoring result of the crack sensor.

3. The vapor line system of claim 1, wherein the crack-monitoring mechanism is disposed at an elbow portion and/or a multi-pass portion of the vapor conduit.

4. The steam pipe system of claim 1, wherein a steam dryness meter is further connected to the steam pipe, and the steam dryness meter is electrically connected to the controller.

5. A steam pipeline crack damage control method is characterized by comprising the following steps:

monitoring crack propagation of the steam pipeline in real time;

and when the crack propagation of the steam pipeline exceeds a preset range, regulating the dryness of the steam in the steam pipeline.

6. The steam pipeline crack damage control method of claim 5, wherein the monitoring of crack propagation of the steam pipeline in real time specifically comprises:

monitoring the crack size of the steam pipeline in real time;

the crack propagation rate is obtained according to the crack size of the steam pipeline.

7. The method for controlling crack damage of a steam pipeline according to claim 5, wherein the crack propagation of the steam pipeline beyond a preset range specifically comprises:

the crack propagation rate of the steam pipe is greater than a first preset value.

8. The steam pipeline crack damage control method of claim 7, further comprising, after adjusting the dryness of the steam within the steam pipeline:

continuously monitoring the crack propagation of the steam pipeline in real time;

when the crack propagation rate of the steam pipeline is smaller than a second preset value, maintaining the current dryness of the steam in the steam pipeline;

and the second preset value is smaller than the first preset value.

9. The steam pipeline crack damage control method of claim 5, wherein adjusting the steam quality within the steam pipeline specifically comprises:

the optimal steam quality value which can enable the crack propagation rate of the steam pipeline to reach the lowest range is obtained in advance through experiments;

and adjusting the dryness of the steam in the steam pipeline according to the optimal steam dryness value.

10. The steam pipeline crack damage control method of claim 5, wherein the monitoring of crack propagation of the steam pipeline in real time specifically comprises:

and monitoring the crack propagation of the elbow part and/or the multi-way part of the steam pipeline in real time.

Technical Field

The invention relates to the technical field of steam pipelines, in particular to a steam pipeline system and a steam pipeline crack damage control method.

Background

Along with the continuous increase of temperature and pressure parameters of thermal power generating units at home and abroad, the increase of the service time of the thermal power generating units in service and the deep peak shaving of the thermal power generating units, in recent years, leakage accidents caused by steam pipeline cracks occur to the thermal power generating units for many times. The steam pipeline is cracked to cause leakage and even breakage, and the steam pipeline is broken to cause serious harm, so that emergency control is performed on crack propagation of the steam pipeline in operation, and the emergency control method has important significance for improving the operation reliability and safety of a steam system.

The existing treatment technology for the cracks of the steam pipeline mainly aims at the crack prevention and the damaged post-treatment, and lacks a control technology for the crack propagation of the steam pipeline.

Disclosure of Invention

The embodiment of the invention provides a steam pipeline system and a steam pipeline crack damage control method, which are used for solving or partially solving the problem that the existing steam pipeline crack treatment lacks a steam pipeline crack propagation control technology.

The embodiment of the invention provides a steam pipeline system, which comprises a steam generator and a steam pipeline which are connected, and further comprises a crack control device, wherein the crack control device comprises a crack monitoring mechanism and a controller, the crack monitoring mechanism is connected to the steam pipeline and used for monitoring crack propagation of the steam pipeline in real time, the controller is electrically connected with the crack monitoring mechanism and the steam generator respectively, and the controller is used for controlling the steam generator to adjust the steam dryness in the steam pipeline when the crack monitoring mechanism monitors that the crack propagation of the steam pipeline exceeds a preset range.

On the basis of the scheme, the crack monitoring mechanism comprises a crack sensor and a processor, the crack sensor is connected to the surface of the steam pipeline and used for monitoring crack propagation in real time, and the processor is electrically connected with the crack sensor and used for obtaining a crack propagation size value according to a monitoring result of the crack sensor.

On the basis of the scheme, the crack monitoring mechanism is arranged at the elbow part and/or the multi-way part of the steam pipeline.

On the basis of the scheme, the steam pipeline is further connected with a steam dryness meter, and the steam dryness meter is electrically connected with the controller.

The embodiment of the invention also provides a steam pipeline crack damage control method, which comprises the following steps: monitoring crack propagation of the steam pipeline in real time; and when the crack propagation of the steam pipeline exceeds a preset range, regulating the dryness of the steam in the steam pipeline.

On the basis of the scheme, the real-time monitoring of the crack propagation of the steam pipeline specifically comprises the following steps: monitoring the crack size of the steam pipeline in real time; the crack propagation rate is obtained according to the crack size of the steam pipeline.

On the basis of the scheme, the step of extending the crack of the steam pipeline beyond the preset range specifically comprises the following steps: the crack propagation rate of the steam pipe is greater than a first preset value.

On the basis of the scheme, the method also comprises the following steps after the steam dryness in the steam pipeline is adjusted: continuously monitoring the crack propagation of the steam pipeline in real time; when the crack propagation rate of the steam pipeline is smaller than a second preset value, maintaining the current dryness of the steam in the steam pipeline; and the second preset value is smaller than the first preset value.

On the basis of the scheme, the step of adjusting the steam dryness in the steam pipeline specifically comprises the following steps: the optimal steam quality value which can enable the crack propagation rate of the steam pipeline to reach the lowest range is obtained in advance through experiments; and adjusting the dryness of the steam in the steam pipeline according to the optimal steam dryness value.

On the basis of the scheme, the real-time monitoring of the crack propagation of the steam pipeline specifically comprises the following steps: and monitoring the crack propagation of the elbow part and/or the multi-way part of the steam pipeline in real time.

According to the steam pipeline system and the steam pipeline crack damage control method provided by the embodiment of the invention, the crack propagation condition of the steam pipeline can be known in real time by arranging the crack monitoring mechanism, and the crack propagation rate of the steam pipeline can be reduced by controlling the steam generator to adjust the dryness of the steam in the steam pipeline when the crack propagation exceeds the allowable range, so that the crack propagation development of the steam pipeline can be effectively controlled, the service life of the steam pipeline is prolonged, and the method has important significance for improving the safety and reliability of the steam pipeline.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the connection of a vapor piping system according to an embodiment of the present invention;

FIG. 2 is a graph of steam quality versus crack propagation rate for an example of the present invention.

Description of reference numerals:

wherein, 1, a steam generator; 2. a crack sensor; 3. a processor; 4. a controller; 5. a heating power regulator; 6. a steam line; 7. a delivery pump; 8. a steam user; 9. a cable; 10. a condenser.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, an embodiment of the present invention provides a steam pipeline system including a steam generator 1 and a steam pipe 6 connected together, and further including a crack control device. The crack control device comprises a crack monitoring mechanism and a controller 4, wherein the crack monitoring mechanism is connected to the steam pipeline 6 and is used for monitoring the crack propagation 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 for controlling the steam generator 1 to adjust the steam dryness inside the steam pipeline 6 when the crack monitoring mechanism monitors that the crack propagation of the steam pipeline 6 exceeds a preset range.

The steam pipe 6 is a pipe with steam as a flowing medium. The steam is delivered to the desired location through a steam pipe 6. The steam pipe 6 may be damaged by cracks due to pressure of internal steam, thermal fatigue, etc. during operation. The present embodiment proposes to provide crack control means for controlling the crack propagation of the steam pipe 6. Unlike the conventional technologies for preventing crack propagation and performing repair treatment after breakage, the crack control device in this embodiment is used to control the crack propagation process of the steam pipe 6.

The crack control device monitors the crack propagation condition of the steam pipeline 6 in real time through the crack monitoring mechanism, and judges the crack propagation condition of the steam pipeline 6 in real time according to the crack condition. Specifically, the crack monitoring mechanism may be used to monitor the crack propagation rate of the steam pipeline 6 in real time. An allowable range of the crack propagation rate may be preset, and 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, the crack propagation rate of the steam pipe 6 is significantly reduced when the steam in the steam pipe 6 is in a certain dryness range. Therefore, the dryness of the steam in the steam pipeline 6 is adjusted to reach the dryness range, the continuous growth of the crack propagation rate can be effectively controlled, and the crack propagation of the steam pipeline 6 is controlled.

The steam pipeline system provided by the embodiment can acquire the crack propagation condition of the steam pipeline 6 in real time by arranging the crack monitoring mechanism, the controller 4 is arranged when the crack propagation exceeds the allowable range, the crack propagation rate of the steam pipeline 6 can be reduced by controlling the steam generator 1 to adjust the dryness of the steam in the steam pipeline 6, so that the crack propagation development of the steam pipeline 6 can be effectively controlled, the service life of the steam pipeline 6 is prolonged, and the steam pipeline system has important significance for improving the safety and reliability of the steam pipeline 6.

On the basis of the above embodiment, further, the crack monitoring mechanism comprises a crack sensor 2 and a processor 3, and the crack sensor 2 is connected to the surface of the steam pipeline 6 and monitors crack propagation in real time. The processor 3 is electrically connected with the crack sensor 2 and is used for obtaining a crack propagation size value according to the monitoring result of the crack sensor 2.

The crack sensor 2 monitors the crack propagation condition in real time at the crack part of the steam pipeline 6. The crack sensor 2 is electrically connected, i.e. signal-connected, to the processor 3 by means of a cable 9. The crack sensor 2 is arranged on the steam pipeline 6 and can be connected to the outer surface of the steam pipeline 6; the processor 3 is electrically connected to the crack sensor 2 via a cable 9. The processor 3 is electrically connected to an input of the controller 4 via a cable 9, and an output of the controller 4 is electrically connected to the steam generator 1 via a cable 9 for controlling the operating parameters of the steam generator 1.

The crack sensor 2 can be installed at a key structure part of the steam pipeline 6 to monitor crack propagation in real time, signals detected by the crack sensor 2 are transmitted to the processor 3 in real time to be processed, a crack propagation size value of a corresponding part is obtained, a first derivative is obtained according to the crack propagation size value and time, a crack propagation rate can be obtained, and the crack propagation rate is sent to the controller 4 in real time.

When the controller 4 detects that the crack propagation rate exceeds a certain numerical value, the crack propagation of the corresponding key structure part of the steam pipeline 6 is aggravated, the controller 4 sends an adjusting instruction to the steam generator 1, and the dryness of the steam in the steam pipeline 6 is adjusted by adjusting the dryness of the steam generated by the steam generator 1, so that the crack propagation rate of the steam pipeline 6 is controlled to be reduced.

Further, crack sensor 2 is the guided wave sensor in this embodiment, and treater 3 is the guided wave detector, and the guided wave detector is used for sending excitation signal to excite out the supersound guided wave on steam conduit 6 through the guided wave sensor. The guided wave sensor is used for collecting echo signals generated by reflection of the ultrasonic guided waves at the cracks and sending the echo signals to the guided wave detector. The guided wave detector obtains a crack propagation size value on the steam pipeline 6 based on the echo signal, and obtains a crack propagation rate according to the crack propagation size value.

Specifically, the principle that guided wave crack growth detected is through inciting somebody to action mechanical oscillation production elasticity guided wave in steam conduit 6, and the guided wave meets the crackle on steam conduit 6 at the in-process of steam conduit 6 internal propagation, and partly ripples can reflect back, and the guided wave that reflects back takes place the inverse effect of magnetostriction when passing through guided wave sensor, produces the signal of telecommunication among the messenger guided wave sensor, and the guided wave detector carries out the acquisition and treatment analysis to the signal that produces among the guided wave sensor, just can realize the detection to pipeline crack growth. By comparing and analyzing the characteristics of the sending pulse and the characteristics of the echo signal, a crack propagation size value on the steam pipeline 6 is obtained, and further the crack propagation rate is obtained.

Further, the crack sensor 2 may also be a fiber grating sensor, and the processor 3 may correspond to an optical signal demodulator. The optical signal demodulator is used for sending out optical signals, the optical signals are reflected by the fiber bragg grating sensor and transmitted back to the optical signal demodulator, and the optical signal demodulator obtains a crack propagation size value on the steam pipeline 6 based on the reflected optical signals, so that the crack propagation rate is obtained.

The crack monitoring mechanism may be any structure capable of monitoring and acquiring a crack propagation size value of the crack portion, and is not limited specifically.

On the basis of the above-mentioned embodiment, further, the crack monitoring mechanism is disposed at the elbow portion and/or the multi-pass portion of the steam pipe 6. The multi-way part is the multi-way connecting interface part. The bend portion and the multi-pass portion of the steam pipe 6 are portions where crack propagation is likely to occur. Crack monitoring mechanisms can be arranged at the elbow part and/or the multi-way part of the steam pipeline 6 so as to perform key monitoring on the key part of the steam pipeline 6 and improve the control efficiency and effect.

Further, when a plurality of crack monitoring mechanisms are arranged at a plurality of positions of the steam pipeline 6, when any crack monitoring mechanism monitors that the crack propagation rate exceeds the allowable range, the steam parameters in the steam pipeline 6 can be adjusted by controlling the steam generator 1.

In addition to the above embodiments, a steam dryness meter is further connected to the steam pipeline 6, and the steam dryness meter is electrically connected to the controller 4. The steam pipe system further comprises a steam dryness meter (not shown) mounted on the steam pipe 6, the steam dryness meter being electrically connected to the controller 4. The steam dryness meter is used for detecting the dryness of the steam in the steam pipeline 6. The steam dryness meter can adopt an orifice plate type dryness meter, a double-conductivity type dryness meter and the like, and can be directly purchased from the market, such as an SQTK pure steam quality detector, an KZP-15 type steam dryness detector and the like. By detecting the steam dryness in real time, the adjustment amount of the steam generator 1 can be controlled and adjusted in an auxiliary manner.

Referring to fig. 1, in particular, the output of the controller 4 is electrically connected to the heating power regulator 5 of the steam generator 1 via a cable 9 to regulate the dryness of the steam produced by the steam generator 1. The steam generator 1 may be a coal-fired boiler, a nuclear power steam generator 1, an oil-fired steam generator 1, or the like.

The steam line system also comprises a delivery pump 7 arranged on the steam pipe 6. Also included are 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 may be connected to a delivery pump 7 and the outlet of the steam pipe 6 is connected to a corresponding steam user 8. The steam user 8 can be a steam turbine, and can be used for generating electricity or directly used for driving power machinery by converting the heat energy of the steam into mechanical energy; the steam user 8 can also be a heat supply user, and directly utilizes the heat energy of the steam to supply heat. The used steam or condensed water is further subjected to heat exchange and cooling through the condenser 10, and the cooled condensed water is conveyed to the steam generator 1 through the conveying pump 7 again to form a steam-condensed water circulating system. In addition, the steam system can be provided with a condensate pump, a deaerator, a heat regenerator and other equipment, the arrangement of the steam pipeline 6 can be adjusted and designed according to actual conditions, and only a schematic diagram is shown in figure 1.

On the basis of the above embodiments, further, the present embodiment provides a crack damage control method for a steam pipeline 6, the control method including: monitoring the crack propagation of the steam pipeline 6 in real time; when the crack propagation of the steam pipe 6 exceeds a preset range, the dryness of the steam in the steam pipe 6 is adjusted.

On the basis of the above embodiment, further, the real-time monitoring of crack propagation of the steam pipeline 6 specifically includes: monitoring the crack size of the steam pipeline 6 in real time; the crack propagation rate is obtained according to the crack size of the steam pipe 6.

On the basis of the above embodiment, further, the crack propagation of the steam pipe 6 beyond the preset range specifically includes: the crack propagation rate of the steam pipe 6 is greater than a first preset value.

On the basis of the above embodiment, further, after adjusting the dryness of the steam in the steam pipeline 6, the method further includes: continuously monitoring the crack propagation of the steam pipeline 6 in real time; when the crack propagation rate of the steam pipe 6 is smaller than the second preset value, the current dryness of the steam inside the steam pipe 6 is maintained. Namely, after the dryness fraction of the steam in the steam pipeline 6 is adjusted when the crack propagation rate of the steam pipeline 6 is greater than the first preset value, the crack propagation rate of the steam pipeline 6 is continuously monitored, and when the crack propagation rate is reduced to be lower than the second preset value, the dryness fraction of the steam in the steam pipeline 6 can be stopped being adjusted, so that the current dryness fraction of the steam can be maintained. And the second preset value is smaller than the first preset value.

According to tests, when the dryness of the steam in the steam pipeline 6 is in a certain range, the crack propagation rate of the key part of the steam pipeline 6 is obviously reduced. The crack monitoring mechanism of the steam pipeline 6 monitors the crack propagation rate of the key structure part and transmits a crack propagation rate value to the controller 4, when the crack propagation rate value is suddenly increased to exceed a first preset value, which indicates that the crack propagation of the steam pipeline 6 is accelerated, the controller 4 sends a dryness fraction adjustment instruction to the steam generator 1, and when the crack propagation rate of the key structure part of the steam pipeline 6 is reduced to an allowable stable value, namely, is reduced to be lower than a second preset value, dryness fraction adjustment is stopped.

On the basis of the above embodiment, further, the adjusting the dryness of the steam in the steam pipeline 6 specifically includes: the optimal steam dryness value which can enable the crack propagation rate of the steam pipeline 6 to reach the lowest range is obtained in advance through experiments; and adjusting the dryness of the steam in the steam pipeline 6 according to the optimal steam dryness value.

On the basis of the above embodiment, further, the real-time monitoring of crack propagation of the steam pipeline 6 specifically includes: and monitoring the crack propagation of the elbow part and/or the multi-way part of the steam pipeline 6 in real time.

Because the steam pipeline 6 has a plurality of working conditions and a complex system, the steam dryness value for realizing the obvious reduction of the crack propagation rate of the steam pipeline 6 can change along with the working conditions and is not a fixed value. That is, the optimal steam quality value capable of reducing the crack propagation rate of the steam pipeline 6 to the minimum range is different according to different specific operating conditions of the steam pipeline 6, that is, the effect of the steam with the same quality value on the reduction of the crack propagation rate of the steam pipeline 6 under different operating conditions is different, and the required steam quality values are different in order to reduce the crack propagation rate of the steam pipeline 6 under different operating conditions to the minimum range.

Fig. 2 shows a relationship diagram between the steam quality and the crack propagation rate of the steam pipeline 6 under a specific working condition, and it can be seen from the test results that, under the working condition, the crack propagation rate of the steam pipeline 6 can be significantly reduced by increasing the steam quality from 60%, after the steam quality is increased to a certain value, the crack propagation rate can rebound and grow along with the continuous increase of the steam quality, but there is an optimal steam quality value range capable of enabling the crack propagation rate of the steam pipeline 6 to reach the lowest, and effective inhibition of crack propagation of the steam pipeline 6 can be achieved by reasonably adjusting the steam quality.

The embodiment proposes that the influence of the steam dryness on the crack propagation rate of the steam pipeline 6 under different working conditions can be studied in advance through experiments. And obtaining the optimal steam dryness values respectively corresponding to the minimum crack propagation rate of the steam pipeline 6 under different working conditions. The optimal steam quality value may also be a range. And then, when the steam pipeline 6 is actually operated, controlling and adjusting the dryness of the steam in the steam pipeline 6 according to the optimal steam dryness value corresponding to the actual operation working condition and the real-time dryness of the steam in the actual operation working condition.

Specifically, when the real-time dryness of the steam in the steam pipeline 6 is greater than the optimal steam dryness value, the dryness of the steam in the steam pipeline 6 is reduced; and when the real-time dryness of the steam in the steam pipeline 6 is less than the optimal steam dryness value, improving the dryness of the steam in the steam pipeline 6.

On the basis of the above embodiments, further, the present embodiment provides a steam pipeline 6 crack propagation emergency control device, aiming at the defects of the existing steam pipeline 6 crack propagation control technology and means. The control device is particularly suitable for use in a main steam line. The emergency control device for crack propagation of the steam pipeline 6 mainly comprises a crack monitoring mechanism of the steam pipeline 6 and a controller 4; the emergency crack propagation control device is connected to the steam pipeline 6. The crack monitoring mechanism comprises a crack sensor 2 and a processor 3, the crack sensor 2 is connected to the steam pipeline 6, and the processor 3 is electrically connected with the crack sensor 2; the output of the processor 3 is electrically connected to the input of the controller 4 and the output of the controller 4 is electrically connected to the heating power regulator 5 of the steam generator 1.

Referring to fig. 1, the present embodiment provides a steam pipeline system, i.e. a pipeline system using steam as a medium. The steam pipeline system comprises 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 line system also comprises a delivery pump 7. The delivery pump 7 is used for delivering steam. The steam pipe 6 flows through a steam consumer 8. The crack propagation emergency control device may be arranged on the steam line 6 between the steam generator 1 and the steam user 8.

The processor 3 in the crack monitoring mechanism of the steam pipeline 6 is connected with the crack sensor 2 through a cable 9, the crack propagation size of the key structure part of the steam pipeline 6 is obtained, and the first derivative of the crack propagation size of the key structure part of the steam pipeline 6 with respect to time is obtained, so that the crack propagation rate of the key structure part of the steam pipeline 6 can be obtained. When the crack propagation rate of the key structure part of the steam pipeline 6 is suddenly increased, the crack propagation of the key structure part of the steam pipeline 6 is judged to be aggravated, a steam dryness adjusting signal is transmitted to the controller 4, the controller 4 sends a dryness adjusting instruction to the steam generator 1, and the steam dryness is adjusted according to requirements. When the crack propagation rate of the key structure part of the steam pipeline 6 is reduced to an allowable stable value, the crack monitoring mechanism of the steam pipeline 6 transmits a signal for stopping adjusting the dryness fraction to the controller 4, and the controller 4 sends an instruction for stopping adjusting the dryness fraction to the steam generator 1.

The dryness of the steam in the steam pipeline 6 is in a certain range, so that the crack propagation rate of the steam pipeline 6 can be obviously reduced, the emergency control on the crack propagation rate of the steam pipeline 6 is realized, and the purposes of improving the reliability and the safety of the steam pipeline 6 are achieved.

Because the steam pipeline 6 is broken to cause serious harm, the emergency control is carried out on the crack propagation rate of the steam pipeline 6 in operation, and the emergency control method has important significance for improving the operation reliability and safety of a steam system. The safety control device and the method for the supercritical carbon dioxide power steam pipeline 6 structure are combined with a steam pipeline 6 crack size monitoring technology, and by adjusting the steam dryness in the steam pipeline 6, the crack propagation rate of the steam pipeline 6 can be obviously reduced, the crack propagation development of the steam pipeline 6 is effectively controlled, the service life of the steam pipeline 6 is prolonged, and the safety and the reliability of the steam pipeline 6 are improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.