Steam pipeline corrosion damage suppression device and suppression method

Abstract

The present invention relates to the technical field of steam pipeline safety devices, and discloses a steam pipeline corrosion damage suppression device and suppression method, wherein the corrosion damage suppression processing device comprises a corrosion damage detection mechanism and a controller, the corrosion damage detection mechanism comprises a corrosion damage sensor and a signal processor, the corrosion damage sensor is installed on the steam pipeline, and the signal processor is electrically connected to the corrosion damage sensor; the signal processor is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the heating power regulator of the steam generator. The steam pipeline corrosion damage suppression device can realize the suppression processing of steam pipeline corrosion damage, so as to achieve the purpose of improving the reliability and safety of the steam system.

Description

Technical Field

[0001] The present invention relates to the technical field of steam pipeline safety devices, and in particular to a steam pipeline corrosion damage suppression device and suppression method. Background Art

[0002] A steam generator is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into hot water or steam. Steam generators are mainly classified according to fuel, and can be divided into electric steam generators, oil-fired steam generators, gas-fired steam generators, nuclear-powered steam generators, etc. In a thermal system, water enters the steam generator to absorb heat and become steam; steam enters the steam turbine, and the steam is condensed into water after the steam turbine works; water passes through the condenser and feed water pump and other equipment before entering the steam generator. In this cycle, water and steam, as the flow medium in thermal equipment, both have the ability to dissolve other substances, but the two are in different forms. Water is in liquid form and becomes a solvent, and steam is in vapor form and is called a dissolved gas. Some salts can be dissolved in water or in steam, but the solubility is different.

[0003] Since there are inevitably some impurities in the feed water, the steam generated in the steam generator will carry gas impurities, and a certain amount of impurity gas will also be dissolved in the transportation process, causing impurities to be deposited in the steam circulation pipeline and corrode the pipeline. At present, existing research focuses on chemical water treatment, mainly for corrosion prevention and post-damage treatment, and there is still a gap in the research on real-time inhibition technology for the development of pipeline corrosion damage. Summary of the invention

[0004] The embodiment of the present invention provides a steam pipeline corrosion damage inhibition device and inhibition method, which are used to solve the problem of how to effectively inhibit the development of corrosion damage of the steam pipeline, so as to improve the operation safety of the steam pipeline.

[0005] An embodiment of the present invention provides a steam pipe corrosion damage suppression device, including a corrosion damage detection mechanism and a controller. The corrosion damage detection mechanism includes a corrosion damage sensor and a signal processor. The corrosion damage sensor is installed on the steam pipe, and the signal processor is electrically connected to the corrosion damage sensor; the signal processor is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the heating power regulator of the steam generator.

[0006] Among them, the corrosion damage sensor is a waveguide sensor, and the signal processor is a waveguide detector. The waveguide detector is used to send out an excitation signal and excite ultrasonic guided waves on the steam pipe through the waveguide sensor; the waveguide sensor is used to collect the echo signal generated by the ultrasonic guided wave reflected at the corrosion damage, and send the echo signal to the waveguide detector; the waveguide detector obtains the corrosion damage size value on the steam pipe based on the echo signal, and sends the corrosion damage size value to the controller.

[0007] Wherein, the waveguide sensor comprises a transmitting coil winding and a receiving coil winding wound around the steam pipe, the waveguide detector comprises a transmitting module, a receiving module and a processing module, the input end of the transmitting module is electrically connected to the controller, and the output end of the transmitting module is electrically connected to the input end of the transmitting coil winding, so as to excite ultrasonic guided waves on the steam pipe through the transmitting coil winding;

[0008] The output end of the receiving coil winding, the receiving module, the processing module and the controller are connected in sequence to convert the echo signal into an electrical signal and send it to the controller.

[0009] Wherein, the corrosion damage sensor is a fiber optic Bragg grating sensor, and the signal processor is an optical signal modulator; the optical signal modulator is used to emit an optical signal, and the optical signal is reflected by the fiber optic Bragg grating sensor and transmitted back to the optical signal modulator. The optical signal modulator obtains the corrosion damage size value on the steam pipe based on the reflected optical signal, and sends the detected corrosion damage size value to the controller.

[0010] Among them, multiple fiber grating sensors are distributed at intervals on the same optical fiber, and the optical signal modulator includes a broadband light source, a coupler and a demodulation module. The broadband light source, the coupler and multiple fiber grating sensors are connected in sequence, and the demodulation module is connected to the coupler; the input end of the broadband light source is electrically connected to the controller, and the output end of the demodulation module is electrically connected to the controller.

[0011] The method further comprises a steam dryness meter installed on the steam pipeline, and the steam dryness meter is electrically connected to the controller.

[0012] The embodiment of the present invention further provides a method for suppressing corrosion damage of a steam pipeline using the steam pipeline corrosion damage suppression device as described above, comprising:

[0013] The corrosion damage sensor sends the detected corrosion damage size signal to the controller after being processed by the signal processor, and the controller calculates the first-order derivative of the corrosion damage size value with respect to time to obtain the measured corrosion rate value;

[0014] When the measured corrosion rate value is greater than the preset corrosion rate value, the controller sends an increase signal to the heating power regulator of the steam generator, and the dryness of the steam pipeline increases;

[0015] When the measured corrosion rate value is less than or equal to the preset corrosion rate value, the controller sends a holding signal to the heating power regulator of the steam generator.

[0016] The steam pipeline corrosion damage suppression device and suppression method provided by the embodiment of the present invention, wherein the corrosion damage suppression device monitors the corrosion rate of the steam pipeline, timely adjusts the heating power regulator of the steam generator when the corrosion damage expands and intensifies, and reduces the corrosion of the pipeline by impurities in the steam by increasing the dryness of the steam. The steam pipeline corrosion damage suppression device can suppress the corrosion damage of the steam pipeline, thereby achieving the purpose of improving the reliability and safety of the steam system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 is a schematic diagram of a steam pipeline corrosion damage suppression device in an embodiment of the present invention;

[0019] Figure 2 is a graph showing the relationship between the dryness of steam and the corrosion rate in an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the installation of a corrosion damage detection mechanism in an embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram of the installation of another corrosion damage detection mechanism in an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1. Steam generator; 2. Corrosion damage sensor; 21. Guided wave sensor;

[0024] 211. Transmitting coil winding; 212. Receiving coil winding; 22. Fiber Bragg grating sensor;

[0025] 3. Signal processor; 31. Guided wave detector; 311. Transmitter module;

[0026] 312, receiving module; 313, processing module; 32, optical signal modulator;

[0027] 321. broadband light source; 322. coupler; 323. demodulation module;

[0028] 324, optical fiber; 4, controller; 5, heating power regulator;

[0029] 6. Steam pipeline; 7. Feedwater pump; 8. Steam users;

[0030] 9. Cable; 10. Condenser. DETAILED DESCRIPTION

[0031] 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.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "upper", "lower", "left", "right", etc. are only used to indicate a relative position relationship. When the absolute position of the described object changes, the relative position relationship may also change accordingly. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0033] It should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the invention can be understood in specific circumstances.

[0034] like Figure 1 As shown, a steam pipeline corrosion damage suppression device provided by an embodiment of the present invention includes a corrosion damage detection mechanism and a controller 4. The corrosion damage detection mechanism includes a corrosion damage sensor 2 and a signal processor 3. The corrosion damage sensor 2 is installed on the steam pipeline 6. The signal processor 3 is electrically connected to the corrosion damage sensor 2 through a cable 9. The signal 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 heating power regulator 5 of the steam generator 1 through the cable 9 to adjust the steam dryness produced by the steam generator 1.

[0035] Specifically, the steam generator 1 can be a coal-fired boiler, a nuclear-powered steam generator, a fuel-fired steam generator, and the like. The inlet of the steam pipe 6 is connected to the feedwater 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 feedwater 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.

[0036] A corrosion damage sensor 2 can be installed at a key structural part of the steam pipe 6 to monitor the corrosion damage in real time. The signal detected by the corrosion damage sensor 2 is transmitted to the signal processor 3 in real time for processing, and the corrosion damage size value of the corresponding part is obtained and transmitted to the controller 4. The corrosion damage size value usually starts from a depth of 0.5 mm and gradually increases. The diameter of the corroded part is between 3 mm and 5 mm.

[0037] When the controller 4 detects that the corrosion rate exceeds a certain value, it determines that the corrosion damage of the corresponding key structural parts of the steam pipe 6 is expanding and aggravating, and the controller 4 sends an adjustment instruction to the heating power regulator 5, thereby increasing the heating power of the steam generator 1 through the heating power regulator 5, thereby increasing the dryness of the steam in the steam pipe 6. Figure 2 A graph showing the relationship between the dryness of steam in the steam pipe 6 and the corrosion rate is shown. According to the test results, it can be seen that the corrosion rate of the steam pipe can be significantly reduced by increasing the steam dryness, and after increasing to a certain dryness, the corrosion rate no longer increases, thereby achieving effective suppression of corrosion damage to the steam pipe.

[0038] The steam pipeline corrosion damage suppression device provided in this embodiment monitors the corrosion rate of the steam pipeline, timely adjusts the heating power regulator 5 of the steam generator 1 when the corrosion damage expands and intensifies, and reduces the corrosion of the pipeline by impurities in the steam by increasing the dryness of the steam. The steam pipeline corrosion damage suppression device can suppress the corrosion damage of the steam pipeline and achieve the purpose of improving the reliability and safety of the steam system.

[0039] Furthermore, if Figure 3As shown, the corrosion damage sensor 2 is a waveguide sensor 21, and the signal processor 3 is a waveguide detector 31. The waveguide detector 31 is used to send an excitation signal and excite ultrasonic guided waves on the steam pipe 6 through the waveguide sensor 21. The waveguide sensor 21 is used to collect echo signals generated by the ultrasonic guided waves reflected at the corrosion damage, and send the echo signals to the waveguide detector 31. The waveguide detector 31 obtains the corrosion damage size value on the steam pipe 6 based on the echo signal, and sends the corrosion damage size value to the controller 4.

[0040] Specifically, the principle of guided wave corrosion damage detection is to generate elastic guided waves by exciting mechanical vibrations in the steam pipe 6. When the guided waves propagate in the steam pipe 6, they encounter corrosion damage on the steam pipe 6, and part of the waves will be reflected back. When the reflected guided waves pass through the guided wave sensor 21, a magnetostrictive inverse effect occurs, causing an electrical signal to be generated in the guided wave sensor 21. The guided wave detector 31 collects, processes and analyzes the signals generated in the guided wave sensor 21, thereby realizing the detection of pipeline corrosion damage.

[0041] Furthermore, if Figure 3 As shown, the waveguide sensor 21 includes a transmitting coil winding 211 and a receiving coil winding 212 wound around the steam pipe 6. The transmitting coil winding 211 and the receiving coil winding 212 can be wound around the pipe in a strip shape, or can be directly buckled outside the pipe in a semicircular shell. The waveguide sensor 21 integrates the waveguide excitation and receiving functions.

[0042] The guided wave detector 31 includes a transmitting module 311, a receiving module 312 and a processing module 313. The input end of the transmitting module 311 is electrically connected to the controller 4 to transmit an excitation signal under the instruction of the controller 4. The output end of the transmitting module 311 is electrically connected to the input end of the transmitting coil winding 211 to excite ultrasonic guided waves on the steam pipe 6 through the transmitting coil winding 211, and the transmitting module 311 can send an excitation pulse signal. The output end of the receiving coil winding 212, the receiving module 312, the processing module 313 and the controller 4 are connected in sequence to convert the echo signal into an electrical signal and send it to the controller 4. The processing module 313 can filter, amplify and process the signal transmitted from the receiving module 312, and obtain the corrosion damage size value on the steam pipe 6 by comparing and analyzing the characteristics of the transmitted pulse and the characteristics of the echo signal, and send the corrosion damage size value to the controller 4. More specifically, the guided wave sensor 21 and the guided wave detector 31 in this embodiment can be directly purchased from the market.

[0043] Furthermore, if Figure 4As shown, the corrosion damage sensor 2 is a fiber grating sensor 22, and the signal processor 3 is an optical signal modulator 32. The optical signal modulator 32 is used to send out an optical signal, and the optical signal is reflected by the fiber grating sensor 22 and transmitted back to the optical signal modulator 32. The optical signal modulator 32 obtains the corrosion damage size value on the steam pipe 6 based on the reflected optical signal, and sends the detected corrosion damage size value to the controller 4.

[0044] Specifically, the principle of fiber Bragg grating corrosion damage detection is that the appearance of corrosion damage on the steam pipe 6 and the size change of the corrosion damage cause the wavelength shift, phase change, polarization state change and intensity change of the reflection or transmission spectrum of the fiber Bragg grating sensor 22. By demodulating these spectral changes, the purpose of detecting the size of the corrosion damage is achieved.

[0045] Furthermore, if Figure 4 As shown, multiple fiber grating sensors 22 are distributed on the same optical fiber 324 at intervals, and each fiber grating sensor 22 corresponds to each detection point. The coupling resonance center wavelength of each fiber grating sensor 22 is different but the bandwidth is the same. The optical signal modulator 32 includes a broadband light source 321, a coupler 322 and a demodulation module 323. The broadband light source 321 matches the wavelength range of the fiber grating sensor 22. The broadband light source 321, the coupler 322 and the multiple fiber grating sensors 22 are connected in sequence, and the demodulation module 323 is connected to the coupler 322. When in use, the broadband light source 321 emits an optical signal containing various wavelengths, which enters the fiber grating sensor 22 through the coupler 322 and the optical fiber 324. Each fiber grating sensor 22 only reflects the light wave of its own central reflection wavelength. When the corrosion damage size changes near the detection point, the central reflection wavelength of the fiber grating sensor 22 corresponding to the detection point is offset, and the reflected light signal of the fiber grating sensor 22 enters the demodulation module 323 through the coupler 322 to obtain the corrosion damage size value. The demodulation module 323 can be a spectrum analyzer or a wavelength encoding and demodulation, photoelectric conversion system. The input end of the broadband light source 321 is electrically connected to the controller 4 to emit an optical signal under the instruction of the controller 4. The output end of the demodulation module 323 is electrically connected to the controller 4 to send the corrosion damage size value to the controller 4. The fiber grating sensor 22 and the optical signal modulator 32 in this embodiment can be directly purchased from the market.

[0046] Furthermore, a steam dryness meter (not shown) installed in the steam pipe 6 is also included, 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 be 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 increase in the heating power regulator 5 can be assisted in controlling and adjusting.

[0047] The embodiment of the present invention further provides a method for suppressing corrosion damage of a steam pipeline using the above-mentioned steam pipeline corrosion damage suppression device, comprising:

[0048] Step S10: the corrosion damage sensor 2 sends the detected corrosion damage size signal to the controller 4 after being processed by the signal processor 3. The controller 4 calculates the first-order derivative of the corrosion damage size value with respect to time to obtain the measured corrosion rate value.

[0049] Step S20: When the measured corrosion rate value is greater than the preset corrosion rate value, the controller 4 sends an increase signal to the heating power regulator 5 of the steam generator 1, and the dryness of the steam pipe 6 increases. By increasing the heating power of the steam generator 1, the steam dryness is increased.

[0050] Step S30: When the measured corrosion rate value is less than or equal to the preset corrosion rate value, the controller 4 sends a hold signal to the heating power regulator 5 of the steam generator 1 to stop adjusting the dryness and keep the current dryness unchanged.

[0051] It can be seen from the above embodiments that the steam pipeline corrosion damage suppression device and suppression method provided by the present invention, wherein the corrosion damage suppression device monitors the corrosion rate of the steam pipeline, timely adjusts the heating power regulator 5 of the steam generator 1 when the corrosion damage expands and intensifies, and reduces the corrosion of the pipeline by impurities in the steam by increasing the dryness of the steam. The steam pipeline corrosion damage suppression device can suppress the corrosion damage of the steam pipeline, thereby achieving the purpose of improving the reliability and safety of the steam system.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steam pipeline corrosion damage suppression device, characterized in that: It comprises a corrosion damage detection mechanism and a controller, wherein the corrosion damage detection mechanism comprises a corrosion damage sensor and a signal processor, wherein the corrosion damage sensor is installed at a key structural part of the steam pipeline, and the signal processor is electrically connected to the corrosion damage sensor; the signal processor is electrically connected to an input end of the controller, and an output end of the controller is electrically connected to a heating power regulator of a steam generator; The controller is configured to: when it is detected that the corrosion rate exceeds a certain value, determine that the corrosion damage of the corresponding key structural parts of the steam pipeline is expanding and aggravating, send an adjustment instruction to the heating power regulator, increase the heating power of the steam generator through the heating power regulator, and then increase the dryness of the steam in the steam pipeline.

2. The steam pipeline corrosion damage suppression device according to claim 1, characterized in that: The corrosion damage sensor is a waveguide sensor, and the signal processor is a waveguide detector. The waveguide detector is used to send out an excitation signal and excite ultrasonic waveguides on the steam pipe through the waveguide sensor; the waveguide sensor is used to collect echo signals generated by the ultrasonic waveguides reflected at the corrosion damage site, and send the echo signals to the waveguide detector; the waveguide detector obtains a corrosion damage size value on the steam pipe based on the echo signal, and sends the corrosion damage size value to the controller.

3. The steam pipeline corrosion damage suppression device according to claim 2, characterized in that: The waveguide sensor comprises a transmitting coil winding and a receiving coil winding wound on the steam pipe, the waveguide detector comprises a transmitting module, a receiving module and a processing module, the input end of the transmitting module is electrically connected to the controller, and the output end of the transmitting module is electrically connected to the input end of the transmitting coil winding, so as to excite ultrasonic guided waves on the steam pipe through the transmitting coil winding; The output end of the receiving coil winding, the receiving module, the processing module and the controller are connected in sequence to convert the echo signal into an electrical signal and send it to the controller.

4. The steam pipeline corrosion damage suppression device according to claim 1, characterized in that: The corrosion damage sensor is a fiber grating sensor, and the signal processor is an optical signal modulator; the optical signal modulator is used to emit an optical signal, and the optical signal is reflected by the fiber grating sensor and transmitted back to the optical signal modulator. The optical signal modulator obtains the corrosion damage size value on the steam pipe based on the reflected optical signal, and sends the detected corrosion damage size value to the controller.

5. The steam pipeline corrosion damage suppression device according to claim 4, characterized in that: A plurality of fiber grating sensors are distributed at intervals on the same optical fiber. The optical signal modulator includes a broadband light source, a coupler and a demodulation module. The broadband light source, the coupler and the plurality of fiber grating sensors are connected in sequence, and the demodulation module is connected to the coupler. The input end of the broadband light source is electrically connected to the controller, and the output end of the demodulation module is electrically connected to the controller.

6. The steam pipeline corrosion damage suppression device according to any one of claims 1 to 5, characterized in that: It also includes a steam dryness meter installed on the steam pipeline, and the steam dryness meter is electrically connected to the controller.

7. A method for inhibiting corrosion damage of a steam pipeline using the steam pipeline corrosion damage inhibiting device according to any one of claims 1 to 6, characterized in that: include: The corrosion damage sensor sends the detected corrosion damage size signal to the controller after being processed by the signal processor, and the controller calculates the first-order derivative of the corrosion damage size value with respect to time to obtain the measured corrosion rate value; When the measured corrosion rate value is greater than the preset corrosion rate value, the controller sends an increase signal to the heating power regulator of the steam generator, and the dryness of the steam pipeline increases; When the measured corrosion rate value is less than or equal to the preset corrosion rate value, the controller sends a holding signal to the heating power regulator of the steam generator.

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