Method and system for determining velocity of fluid in a steam generator

Abstract

Embodiments of the present application relate to the field of steam generators, and in particular to a method and system for determining the velocity of fluid in a steam generator. The method comprises: S10, determining the position of a probe for positioning a laser; S20, perpendicularly incident the laser on the outside window surface of the steam generator; S30, adjusting the position of the laser focal point to a predetermined measurement position according to the position of the probe; S40, moving the laser along the axial direction of the steam generator to measure the axial velocity of the fluid using the laser; S50, incident the laser along the top of the steam generator to adjust the position of the laser focal point to a predetermined measurement position; S60, moving the laser along the radial direction of the steam generator to measure the radial velocity of the fluid using the laser; S70, determining the velocity of the fluid according to the axial velocity determined in S40 and the radial velocity determined in S60. The method can improve the accuracy of the determined velocity of the fluid and provide support for the subsequent design of the steam generator.

Description

Technical Field

[0001] Embodiments of this application relate to the field of steam generators, and more specifically to a method and system for determining the velocity of a fluid in a steam generator. Background Technology

[0002] The statements herein are provided merely as background information in connection with this application and do not necessarily constitute prior art.

[0003] In a reactor, the steam generator is an important piece of equipment. It is used to generate steam from the heat produced by the fuel in the reactor core, and then generate electricity from the steam. The velocity of the fluid inside the steam generator is related to the power generation efficiency. Therefore, it is necessary to determine the velocity of the fluid inside the steam generator.

[0004] Currently, there are still many limitations in the technology for determining the velocity of fluids inside a steam generator. Summary of the Invention

[0005] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] To address the aforementioned problems, embodiments of this application provide a method and system for determining the velocity of fluid in a steam generator.

[0007] In a first aspect, embodiments of this application provide a method for determining the velocity of a fluid in a steam generator, the method comprising the following steps: S10: determining the position of a probe for positioning a laser; S20: perpendicularly incident a laser onto the outer viewing window surface of the steam generator; S30: adjusting the position of the laser focal point to a predetermined measurement position according to the position of the probe; S40: moving the laser along the axial direction of the steam generator to determine the axial velocity of the fluid using the laser; S50: incident the laser along the top of the steam generator to bring the position of the laser focal point to the predetermined measurement position; S60: moving the laser radially along the steam generator to determine the radial velocity of the fluid using the laser; S70: determining the velocity of the fluid based on the axial velocity determined in step S40 and the radial velocity determined in step S60.

[0008] Because the tube spacing of the steam generator is very small, the method provided in this application uses laser to determine the velocity of the fluid inside the steam generator. Compared with using ultrasound to determine the velocity of the fluid inside the steam generator, this avoids the influence of the tube spacing on the velocity determination and improves the accuracy of the determined fluid velocity. At the same time, the method provided in this application determines the fluid velocity by determining the axial and radial velocities, which further improves the accuracy of the determined fluid velocity. Furthermore, by positioning the laser probe, the obtained fluid velocity can be used for subsequent CFD (fluid dynamics) calculations, which can verify the accuracy of CFD and provide support for the design of the subsequent steam generator.

[0009] Secondly, embodiments of this application provide a system for determining the velocity of a fluid in a steam generator, comprising a probe and a laser. The probe is disposed within the steam generator and configured to guide the laser beam of the laser; the laser is configured to emit a laser beam and determine the velocity of the fluid in the steam generator according to the aforementioned method. Attached Figure Description

[0010] Other objects and advantages of this application will become apparent from the following description of embodiments of this application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of this application.

[0011] Figure 1 This is a schematic diagram of a probe being arranged in a steam generator according to an embodiment of this application.

[0012] Figure 2 The method provided in the embodiments of this application is used to arrange the probe in a top view of a steam generator.

[0013] Explanation of reference numerals in the attached figures: 10. Probe; 200. Steam generator; 210. External viewing window; 220. Flow equalization grid; 301. Laser movement path.

[0014] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0015] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0016] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0017] In related technologies, ultrasonic waves are typically used to determine the velocity of fluid inside a steam generator. However, due to the small spacing between the tube bundles in a steam generator, ultrasonic waves are reflected by the tube bundles, resulting in inaccurate measurements of the fluid velocity.

[0018] To address the aforementioned problems, embodiments of this application provide a method and system for determining the velocity of fluid in a steam generator.

[0019] See Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the probe 10 being arranged in the steam generator 200 according to the method provided in the embodiments of this application. Figure 2 This is a top view of a probe 10 arranged in a steam generator 200 according to an embodiment of this application. An embodiment of this application provides a method for determining the velocity of a fluid in a steam generator, which may include the following steps S10-S70.

[0020] S10: Determine the position of the probe 10 used for positioning the laser; S20: Direct the laser perpendicularly onto the surface of the outer viewing window 210 of the steam generator 200; S30: Adjust the position of the laser focal point to the predetermined measurement position according to the position of the probe 10; S40: Move the laser along the axial direction of the steam generator 200 to determine the axial velocity of the fluid using the laser; S50: Direct the laser along the top of the steam generator 200 to bring the position of the laser focal point to the predetermined measurement position; S60: Move the laser radially along the steam generator 200 to determine the radial velocity of the fluid using the laser; S70: Determine the velocity of the fluid based on the axial velocity determined in step S40 and the radial velocity determined in step S60.

[0021] Because the tube spacing of the steam generator 200 is very small, the method provided in this application uses laser to determine the velocity of the fluid inside the steam generator 200. Compared with using ultrasound to determine the velocity of the fluid inside the steam generator 200, this avoids the influence of the tube spacing on the velocity determination and improves the accuracy of the measured fluid velocity. At the same time, the method provided in this application determines the fluid velocity by determining the axial and radial velocities, which further improves the accuracy of the determined fluid velocity. Furthermore, by positioning the laser probe 10, the obtained fluid velocity can be used for subsequent CFD (fluid dynamics) calculations, which can verify the accuracy of CFD and provide support for the subsequent design of the steam generator 200.

[0022] In some embodiments, a plurality of probes 10 are provided within the steam generator 200 to determine the location of laser beam focusing and measurement, thereby enabling the laser to focus the laser beam at the measurement location and improve the accuracy of the determined fluid velocity.

[0023] See Figure 2 In some embodiments, the plurality of probes 10 are arranged in a circle along the circumference of the steam generator 200.

[0024] In some embodiments, step S10 may further include the following steps: determining the centerline of the outer viewing window 210 of the steam generator 200; moving a predetermined distance radially from the centerline along the steam generator 200 to fix the probe 10 to the flow equalization grid 220 of the steam generator 200. Since the axial velocity of the fluid is not uniform throughout the steam generator 200, in the embodiments of this application, by placing the probe 10 at the flow equalization grid 220 where the axial velocity of the fluid is uniform, the axial velocity of the uniform fluid can be determined, thereby ensuring the accuracy of the determined axial velocity of the fluid.

[0025] By moving the probe 10 radially a predetermined distance from the centerline along the steam generator 200, and positioning it at this location, it is possible to avoid the probe 10 being placed inside the holes of the flow equalization grid 220. When using the probe 10 to guide the laser measurement position, the laser position is adjusted to a position where the probe 10 has not moved the predetermined distance.

[0026] In some embodiments, step S20 may further include the following step: determining whether the laser is perpendicular to the surface of the outer window 210 of the steam generator 200 based on the fact that the laser is emitted from the opposite side window of the outer window 210. Since the steam generator 200 has a large number of tubes with small spacing, it is difficult to determine whether the laser is perpendicularly incident. Therefore, in the embodiments of this application, by determining whether the laser is perpendicularly incident based on the fact that the laser is emitted from the opposite side window of the outer window 210, the difficulty of determining whether the laser is perpendicularly incident can be reduced, making it easier to determine whether the laser is perpendicular to the surface of the outer window 210 of the steam generator 200.

[0027] In some embodiments, step S30 may further include the following steps: adjusting the position of the laser focal point to the surface of the outer viewing window 210; adjusting the axial and circumferential positions of the laser focal point so that it is located at the center of the outer viewing window 210; adjusting the position of the laser focal point radially so that it is located at the top of the probe 10; and adjusting the position of the laser focal point radially again so that it reaches the predetermined measurement position. In such an embodiment, by adjusting the position of the laser focal point through the above steps, it is possible to ensure that the predetermined measurement position is the true starting point for determining the axial velocity of the fluid, and to ensure that the multiple probes 10 are consistent in the circumferential direction, thereby improving the accuracy of the determined axial velocity of the fluid.

[0028] See Figure 1 , Figure 1 The diagram illustrates a laser movement path 301 along the axial direction of the steam generator 200 when measuring the axial velocity of the fluid in the steam generator 200. In some embodiments, in step S40, the laser may move along the axial direction of the steam generator 200 at predetermined intervals. In such embodiments, moving the laser along the axial direction of the steam generator 200 at predetermined intervals allows for the acquisition of the axial velocity distribution of the fluid, resulting in a more accurate determination of the fluid's axial velocity.

[0029] See Figure 1 In some embodiments, the predetermined spacing can be the length of the outer window 210. In such embodiments, by setting the predetermined spacing to the length of the outer window 210, the distance the laser moves can be accurately determined, and thus, when determining the axial velocity of the fluid based on the laser movement, the axial velocity of the fluid can be accurately determined, thereby accurately determining the fluid velocity.

[0030] In some embodiments, step S50 may further include the following steps: adjusting the position of the laser focal point to the surface of the top window; adjusting the axial and circumferential positions of the laser focal point so that it is located at the top of the probe 10; and radially adjusting the position of the laser focal point according to the position of the probe 10 so that it reaches the predetermined measurement position. In such an embodiment, by adjusting the position of the laser focal point through the above steps, it is possible to ensure that the predetermined measurement position is the true starting point for determining the radial velocity of the fluid, and it is possible to ensure that the multiple probes 10 are consistent in the circumferential direction, thereby improving the accuracy of the determined radial velocity of the fluid.

[0031] In some embodiments, in step S60, the laser moves radially along the steam generator 200 at a predetermined interval. In such embodiments, moving the laser radially along the steam generator 200 at a predetermined interval allows for obtaining the radial velocity distribution of the fluid, resulting in a more accurate determination of the fluid's radial velocity.

[0032] In some embodiments, the predetermined distance the laser moves radially along the steam generator 200 can be the length of the top window. In such embodiments, by setting the predetermined distance to the length of the top window, the distance the laser moves can be accurately determined, and thus, when determining the radial velocity of the fluid based on the laser's movement, the radial velocity of the fluid can be accurately determined, thereby accurately determining the fluid's velocity.

[0033] Embodiments of this application also provide a system for determining the velocity of a fluid in a steam generator 200, which may include a probe 10 and a laser. The probe 10 is disposed within the steam generator 200 and configured to serve as a guide for the laser beam of the laser; the laser is configured to emit a laser beam and determine the velocity of the fluid in the steam generator 200 according to the method provided in any embodiment of this application.

[0034] Because the tube spacing of the steam generator 200 is very small, the system provided in the embodiments of this application uses laser to measure the velocity of the fluid inside the steam generator 200. Compared with using ultrasound to measure the velocity of the fluid inside the steam generator 200, this avoids the influence of the tube spacing on the velocity measurement and improves the accuracy of the measured fluid velocity. At the same time, the system provided in the embodiments of this application determines the axial velocity and radial velocity of the fluid by the method provided in any embodiment of this application, thereby determining the fluid velocity, which can further improve the accuracy of the determined fluid velocity. Furthermore, by using the probe 10 as a guide for the laser, the position of the laser can be determined by determining the position of the probe 10, thereby determining the laser's movement path. This allows the obtained fluid velocity to be used for subsequent CFD (fluid dynamics) calculations, verifying the accuracy of the CFD and providing support for the subsequent design of the steam generator 200.

[0035] In some embodiments, the system provided in this application may further include a data processor configured to receive signals from a laser and process the laser signals to determine the velocity of the fluid in the steam generator 200. For specific processing methods, those skilled in the art can select a data processor using commonly used data processing methods.

[0036] It should also be noted that, without conflict, the embodiments and features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A method for determining the velocity of a fluid in a steam generator, characterized in that, The method includes the following steps: S10: Determine the position of the probe used to locate the laser; S20: The laser is incident perpendicularly onto the outer viewing window surface of the steam generator; S30: Adjust the position of the laser focus point to the predetermined measurement position according to the position of the probe; S40: Move the laser along the axial direction of the steam generator to determine the axial velocity of the fluid using the laser; S50: The laser is incident along the top of the steam generator so that the laser focal point is positioned at a predetermined measurement location; S60: Move the laser radially along the steam generator to determine the radial velocity of the fluid using the laser; S70: Determine the velocity of the fluid based on the axial velocity determined in step S40 and the radial velocity determined in step S60.

2. The method according to claim 1, characterized in that, Step S10 also includes the following steps: Determine the centerline of the outer viewing window of the steam generator; Starting from the center line, move a predetermined distance radially along the steam generator to fix the probe to the flow equalization grid plate of the steam generator.

3. The method according to claim 1, characterized in that, Step S20 also includes the following steps: Based on the fact that the laser is emitted from the opposite side window of the outer window, it is determined that the laser is perpendicular to the surface of the outer window of the steam generator.

4. The method according to claim 1, characterized in that, Step S30 also includes the following steps: Adjust the position of the laser focal point to the surface of the outer window; Adjust the axial and circumferential positions of the laser focal point so that it is located at the center of the outer window; Adjust the position of the laser focusing point radially so that it is located at the top of the probe; The position of the laser focus point is adjusted radially again so that it reaches the predetermined measurement position.

5. The method according to claim 1, characterized in that, In step S40, the laser moves along the axial direction of the steam generator at a predetermined interval.

6. The method according to claim 5, characterized in that, The predetermined spacing is the length of the outer window.

7. The method according to claim 1, characterized in that, The S50 step also includes the following steps: Adjust the position of the laser focusing point to the surface of the top window; Adjust the axial and circumferential positions of the laser focal point so that it is located at the top of the probe; Based on the position of the probe, the position of the laser focusing point is radially adjusted so that it reaches the predetermined measurement position.

8. The method according to claim 1, characterized in that, In step S60, the laser moves radially along the steam generator at a predetermined interval.

9. A system for determining the velocity of a fluid in a steam generator, characterized in that, It includes: Probes, lasers The probe is disposed inside the steam generator and is configured to serve as a guide for the laser beam of the laser. The laser is configured to emit laser light and to determine the velocity of the fluid in the steam generator according to any one of claims 1-8.

10. The system according to claim 9, characterized in that, It also includes a data processor configured to receive signals from the laser and process the signals from the laser to determine the velocity of the fluid in the steam generator.

Images