Method and device for measuring blocking temperature of sodium medium

Abstract

The invention particularly relates to a sodium medium blocking temperature measuring method, which comprises the following steps of: acquiring the temperature and the flow of a sodium medium in a blocking hole of a blocking meter according to a set sampling period and sampling point interval time, and forming a sodium medium flow-sodium medium temperature curve in the sampling period; solving a second derivative of the sodium medium flow curve point in the sampling period, and judging a sodium medium flow decline inflection point in the sampling period; and outputting the sodium medium temperature corresponding to the sodium medium flow reduction inflection point in the sampling period as the sodium medium blocking temperature in the sampling period. The invention further relates to a sodium medium blocking temperature measuring device. According to the invention, automatic, efficient and accurate measurement of the blocking temperature of the sodium medium is realized.

Description

Technical Field

[0001] The invention relates to the technical field of instrumentation and operation of nuclear power plants, and in particular to a method and device for measuring sodium medium blocking temperature. Background Art

[0002] The blockage meter is an online measuring instrument for measuring impurities in sodium in a fast reactor. The impurity situation in sodium is obtained by measuring the blocking temperature. The working principle of the blockage meter is that the solubility of non-metallic impurities changes with temperature. Sodium flows through the blocking area of ​​the blockage meter through a branch, and the frequency conversion fan cools the blocking area at a certain rate. The temperature of the sodium flowing through the blocking area drops. When the sodium temperature drops below the saturation temperature of the impurities, the impurities precipitate in the blocking hole of the blockage meter. The accumulation of impurities in the blocking hole causes the sodium flow to decrease. If cooling is stopped after the blockage occurs and heating is used instead, the impurities will continue to dissolve from the blocking hole, and finally the sodium flow will return to the original level. Here, the temperature at the blocking hole when the sodium flow begins to decrease is called the blocking temperature. The blockage meter determines the impurity content in the sodium flow by measuring the sodium flow temperature when the blocking hole is blocked.

[0003] The blockage meter has two measurement methods: manual measurement and automatic measurement. Manual measurement is to read the flow and blockage temperature values ​​by conventional instruments. In the local PLC, the automatic measurement algorithm of the blockage meter uses the percentage of sodium flow reduction to determine the inflection point of sodium flow reduction, thereby obtaining the blockage temperature and sending it to the DCS for display. However, the blockage temperature measured by this algorithm is often too high compared to the actual blockage temperature, and the deviation is too large. According to the current on-site measurement results of a fast reactor, manual measurement is more accurate than the automatic measurement of the local PLC, but the measurement efficiency is low. Summary of the invention

[0004] The object of the present invention is to provide a method and device for measuring the blocking temperature of a sodium medium, so as to realize automatic, efficient and accurate measurement of the blocking temperature of a sodium medium.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for measuring sodium medium blocking temperature comprises the following steps:

[0007] The sodium medium temperature and sodium medium flow rate in the plugging hole of the plugging meter are collected according to the set sampling period and sampling point interval time to form a sodium medium flow rate-sodium medium temperature curve within the sampling period;

[0008] The second-order derivative of the sodium medium flow curve point within the sampling period is calculated to determine the inflection point of the sodium medium flow decrease within the sampling period;

[0009] The sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period is output as the sodium medium blocking temperature within the sampling period.

[0010] As one of the feasible ways, the second-order derivative of the sodium medium flow curve point within the sampling period is calculated;

[0011] When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, the point is judged to be the inflection point of the sodium medium flow rate decrease within the sampling period, and the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period is output as the sodium medium blocking temperature within the sampling period.

[0012] As another achievable method, the second-order derivative of the sodium medium flow curve point within the sampling period is calculated;

[0013] When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, and the points within the set time after the point show a decreasing trend, the point is judged to be the inflection point of the sodium medium flow rate decrease within the sampling period, and the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period is output as the sodium medium blocking temperature within the sampling period.

[0014] As one of the feasible methods, after determining the inflection point of the sodium medium flow rate decrease within the sampling period and outputting the sodium medium blocking temperature within the sampling period, stop collecting the sodium medium flow rate and the sodium medium temperature within the sampling period, and stop determining the inflection point of the sodium medium flow rate decrease within the sampling period and outputting the sodium medium blocking temperature within the sampling period of the blocking meter.

[0015] As one of the achievable methods, after outputting the sodium medium blocking temperature in the previous sampling cycle, resetting and triggering collect the sodium medium temperature and sodium medium flow rate in the blocking hole of the blocking meter according to the set sampling cycle and sampling point interval time, and forming a sodium medium flow rate-sodium medium temperature curve in the next sampling cycle;

[0016] After forming the sodium medium flow-sodium medium temperature curve in the next sampling cycle, reset and trigger to determine the sodium medium flow drop inflection point in the next sampling cycle and output the sodium medium blocking temperature in the next sampling cycle.

[0017] As one achievable manner, the sodium medium blocking temperature measurement method further includes: after determining the sodium medium flow rate decline inflection point within the sampling period, marking the sodium medium flow rate decline inflection point on the sodium medium flow rate curve within the sampling period.

[0018] The present invention also provides a sodium medium blockage temperature measuring device, comprising:

[0019] The sampling point module is used to collect the sodium medium temperature and sodium medium flow rate in the plugging hole of the plugging meter according to the set sampling period and sampling point interval time, and form a sodium medium flow rate-sodium medium temperature curve within the sampling period;

[0020] The blocking temperature measurement module is used to obtain the second-order derivative of the sodium medium flow curve point within the sampling period, determine the inflection point of the sodium medium flow decline within the sampling period; and output the sodium medium temperature corresponding to the inflection point of the sodium medium flow decline within the sampling period as the sodium medium blocking temperature within the sampling period.

[0021] As one of the achievable methods, the blocking temperature measurement module calculates the second-order derivative of the sodium medium flow curve point within the sampling period;

[0022] When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, the blocking temperature measurement module determines that the point is the inflection point of the sodium medium flow rate decrease within the sampling period, and outputs the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period as the sodium medium blocking temperature within the sampling period.

[0023] As another achievable method, the blocking temperature measurement module calculates the second-order derivative of the sodium medium flow curve point within the sampling period;

[0024] When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, and the points within the set time after the point show a decreasing trend, the blocking temperature measurement module determines that the point is the inflection point of the sodium medium flow rate decrease within the sampling period, and outputs the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period as the sodium medium blocking temperature within the sampling period.

[0025] As one of the feasible ways, after the blocking temperature measurement module determines the inflection point of the sodium medium flow rate decrease within the sampling period and outputs the sodium medium blocking temperature within the sampling period, it stops collecting the sodium medium flow rate and the sodium medium temperature within the sampling period, and stops determining the inflection point of the sodium medium flow rate decrease within the sampling period and outputting the sodium medium blocking temperature within the blocking meter sampling period.

[0026] As one of the achievable ways, the sodium medium blockage temperature measuring device further includes a periodic triggering module;

[0027] After the blocking temperature measurement module outputs the sodium medium blocking temperature in the previous sampling cycle, the periodic trigger module resets and triggers the sampling point module to collect the sodium medium temperature and sodium medium flow in the blocking hole of the blocking meter according to the set sampling point interval time, and forms a sodium medium flow-sodium medium temperature curve in the next sampling cycle;

[0028] After the sampling point module forms the sodium medium flow-sodium medium temperature curve in the next sampling period, the periodic trigger module resets and triggers the blocking temperature measurement module to determine the sodium medium flow decline inflection point in the next sampling period and output the sodium medium blocking temperature in the next sampling period.

[0029] As one of the feasible ways, after the blocking temperature measurement module determines the sodium medium flow rate decline inflection point within the sampling period, it marks the sodium medium flow rate decline inflection point on the sodium medium flow rate curve within the sampling period and outputs the sodium medium blocking temperature within the sampling period.

[0030] Beneficial technical effects of the present invention:

[0031] The sodium medium blocking temperature measurement method and device of the present invention do not need to determine a certain threshold value or set value. The sodium medium flow rate decline inflection point is determined by comparing the size relationship between the second-order derivatives or slope differences of adjacent points on the sodium medium flow curve. The sodium medium temperature corresponding to the sodium medium flow rate decline inflection point is the sodium medium blocking temperature, thereby realizing automatic, efficient and accurate measurement of the sodium medium blocking temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic flow chart of an embodiment of a method for measuring sodium medium blocking temperature of the present invention;

[0033] Figure 2 It is a structural schematic diagram of an embodiment of a sodium medium blocking temperature measuring device of the present invention;

[0034] Figure 3 This is a schematic diagram of the sodium medium flow-sodium medium temperature curve within a sampling period. DETAILED DESCRIPTION

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0038] See also Figure 1 This embodiment provides a sodium medium blocking temperature measurement method, comprising the following steps:

[0039] The sodium medium temperature and sodium medium flow rate in the plugging hole of the plugging meter are collected according to the set sampling period and sampling point interval time to form a sodium medium flow rate-sodium medium temperature curve within the sampling period;

[0040] The second-order derivative of the sodium medium flow curve point within the sampling period is calculated to determine the inflection point of the sodium medium flow decrease within the sampling period;

[0041] The sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period is output as the sodium medium blocking temperature within the sampling period.

[0042] In this embodiment, as one of the achievable methods, the second-order derivative of the sodium medium flow curve point within the sampling period is calculated;

[0043] When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, the point is judged to be the inflection point of the sodium medium flow rate decrease within the sampling period, and the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period is output as the sodium medium blocking temperature within the sampling period.

[0044] In one sampling cycle, the sodium medium flows through the blocking hole of the blockage meter, the temperature of the sodium medium in the blocking hole of the blockage meter drops to the blocking temperature and maintains for a period of time before rising to recovery, and the sodium medium flow in the blocking hole of the blockage meter drops to the lowest point and then rises to recovery.

[0045] The temperature of the sodium medium in the blocking hole is controlled by a variable frequency fan. When the temperature of the sodium medium in the blocking hole reaches the blocking temperature, impurities in the sodium medium are precipitated, the blocking hole is blocked, and the sodium medium flow in the blocking hole decreases. The sodium medium temperature corresponding to the inflection point of the sodium medium flow decrease in the blocking hole is the sodium medium blocking temperature.

[0046] The geometric meaning of the second derivative is to describe the curvature of the curve. The curvature of the curve can be understood as the degree of curvature of the curve point. It can be seen from the sodium medium flow curve that the sodium medium flow decline inflection point, the sodium medium flow minimum point and the sodium medium flow rise inflection point are the most curved in the sodium medium flow curve. Combining the curvature of the curve and the analysis of the sodium medium flow curve, the second derivative of the sodium medium flow curve point can be obtained to obtain the point with the largest curvature in the sodium medium flow curve, and then further screened to obtain the sodium medium flow decline inflection point.

[0047] The first derivative of a continuous curve indicates the slope of the tangent line of the curve at a certain point, and the second derivative of a continuous curve indicates how fast the slope of the curve changes. The larger the absolute value of the second derivative of the curve, the faster the slope of the curve changes. The descending inflection point, the minimum point, and the rising inflection point are all the points where the slope changes the fastest on the curve, so the sodium medium flow descending inflection point, the sodium medium flow minimum point, and the sodium medium flow rising inflection point are the ones with the largest absolute value of the second derivative in the sodium medium flow curve. The four curves divided by the sodium medium flow descending inflection point, the sodium medium flow minimum point, and the sodium medium flow rising inflection point are analyzed respectively. The slope change rate of the curve before the sodium medium flow descending inflection point is close to 0, that is, the second derivative value is close to 0. The curve after the sodium medium flow descending inflection point is approximately a linear function curve with a negative slope, and the slope change rate is also close to 0, that is, the second derivative value is close to 0. Similarly, the second derivative values ​​of the curves before and after the sodium medium flow rising inflection point are also close to 0.

[0048] The second-order derivative limit definition formula is: It can be seen from the definition formula of the second-order derivative limit that under the same Δx condition, the size of the second-order derivative value is determined by the first-order derivative of the adjacent points on the curve, so the judgment condition for calculating the second-order derivative can also be simplified to comparing the adjacent slope differences to determine the inflection point. This judgment method does not require determining a certain threshold or set value. Set the appropriate sampling interval time and sampling period, and by comparing the size relationship between the second-order derivatives or slope differences of adjacent points on the curve, the inflection point of the sodium flow decrease can be obtained.

[0049] According to the concavity and convexity of the curve and the definition formula of the second-order derivative limit, the positive and negative second-order derivative values ​​of the sodium medium flow rising inflection point, the sodium medium flow falling inflection point and the sodium medium flow minimum point on the sodium medium flow curve are judged respectively; the second-order derivative values ​​of the sodium medium flow falling inflection point and the sodium medium flow rising inflection point are less than 0, and the second-order derivative value of the sodium medium flow minimum point is greater than 0.

[0050] The absolute value of the second-order derivative of the sodium medium flow rising inflection point, the sodium medium flow falling inflection point and the sodium medium flow minimum point is the largest in the sodium medium flow curve. Combined with the positive and negative judgment of the second-order derivative of the sodium medium flow rising inflection point, the sodium medium flow falling inflection point and the sodium medium flow minimum point, it can be seen that the sodium medium flow falling inflection point and the sodium medium flow rising inflection point are the points with the smallest second-order derivative in the sodium medium flow curve, and the sodium medium flow minimum point is the point with the largest second-order derivative in the sodium medium flow curve. The second-order derivatives of the sodium medium flow rising inflection point and the sodium medium flow falling inflection point are both less than 0 and are smaller than the second-order derivatives of the points on both sides of the inflection point.

[0051] Assuming that the sodium medium flow value collected within the sampling period will not show a sudden high-frequency signal, the inflection point of the sodium medium flow decrease can be determined by first calculating the second-order derivative of the sodium medium flow curve point, and then comparing it with the second-order derivative values ​​of the adjacent curve points on both sides. If the second-order derivative value of this point is less than 0 and is less than the second-order derivative value of the adjacent curve points on both sides, it can be determined that this point is the inflection point of the sodium medium flow increase or the inflection point of the sodium medium flow decrease.

[0052] In order to ensure that the inflection point of the sodium medium flow rate decrease is more accurate, in this embodiment, as another achievable method, the second-order derivative of the sodium medium flow rate curve point within the sampling period is calculated;

[0053] When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, and the points within the set time after the point show a decreasing trend, the point is judged to be the inflection point of the sodium medium flow rate decrease within the sampling period, and the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period is output as the sodium medium blocking temperature within the sampling period.

[0054] Since the rising inflection point of the sodium medium flow rate within the sampling period is not what the present invention needs to obtain, the rising inflection point of the sodium medium flow rate within the sampling period appears after the falling inflection point of the sodium medium flow rate. In this embodiment, as one of the achievable methods, after determining the falling inflection point of the sodium medium flow rate within the sampling period and outputting the sodium medium blocking temperature within the sampling period, the sodium medium flow rate and the sodium medium temperature within the sampling period are stopped from being collected, and the sodium medium flow rate falling inflection point within the sampling period and the sodium medium blocking temperature within the sampling period of the output blocking meter are stopped.

[0055] In this embodiment, as one of the achievable methods, after outputting the sodium medium blocking temperature in the previous sampling period, resetting and triggering collect the sodium medium temperature and sodium medium flow rate in the blocking hole of the blocking meter according to the set sampling period and sampling point interval time, and forming a sodium medium flow rate-sodium medium temperature curve in the next sampling period;

[0056] After forming the sodium medium flow-sodium medium temperature curve in the next sampling cycle, reset and trigger to determine the sodium medium flow drop inflection point in the next sampling cycle and output the sodium medium blocking temperature in the next sampling cycle.

[0057] In this embodiment, as one of the achievable ways, the sodium medium blocking temperature measurement method further includes: after determining the sodium medium flow rate decline inflection point within the sampling period, marking the sodium medium flow rate decline inflection point on the sodium medium flow rate curve within the sampling period.

[0058] In this embodiment, as one of the achievable ways, the sodium medium blocking temperature measurement method further includes: forming a sodium medium blocking temperature curve from the sodium medium blocking temperature in each sampling period.

[0059] refer to Figure 2 As an implementation of the above method, the present invention provides an embodiment of a sodium medium blockage temperature measuring device. The device embodiment corresponds to the embodiment of the above sodium medium blockage temperature measuring method. The device can be specifically applied to various electronic devices.

[0060] The sodium medium blockage temperature measuring device described in this embodiment includes:

[0061] The sampling point module is used to collect the sodium medium temperature and sodium medium flow rate in the plugging hole of the plugging meter according to the set sampling period and sampling point interval time, and form a sodium medium flow rate-sodium medium temperature curve within the sampling period;

[0062] The blocking temperature measurement module is used to obtain the second-order derivative of the sodium medium flow curve point within the sampling period, determine the inflection point of the sodium medium flow decline within the sampling period; and output the sodium medium temperature corresponding to the inflection point of the sodium medium flow decline within the sampling period as the sodium medium blocking temperature within the sampling period.

[0063] In this embodiment, as one of the achievable methods, the blocking temperature measurement module calculates the second-order derivative of the sodium medium flow curve point within the sampling period;

[0064] When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, the blocking temperature measurement module determines that the point is the inflection point of the sodium medium flow rate decrease within the sampling period, and outputs the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period as the sodium medium blocking temperature within the sampling period.

[0065] In this embodiment, as another achievable method, the blocking temperature measurement module calculates the second-order derivative of the sodium medium flow curve point within the sampling period;

[0066] When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, and the points within the set time after the point show a decreasing trend, the blocking temperature measurement module determines that the point is the inflection point of the sodium medium flow rate decrease within the sampling period, and outputs the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period as the sodium medium blocking temperature within the sampling period.

[0067] In this embodiment, as one of the feasible methods, after the blocking temperature measurement module determines the inflection point of the sodium medium flow rate decrease within the sampling period and outputs the sodium medium blocking temperature within the sampling period, it stops collecting the sodium medium flow rate and the sodium medium temperature within the sampling period, and stops determining the inflection point of the sodium medium flow rate decrease within the sampling period and outputting the sodium medium blocking temperature within the blocking meter sampling period.

[0068] In this embodiment, as one of the achievable ways, the sodium medium blockage temperature measuring device further includes a periodic triggering module;

[0069] After the blocking temperature measurement module outputs the sodium medium blocking temperature in the previous sampling cycle, the periodic trigger module resets and triggers the sampling point module to collect the sodium medium temperature and sodium medium flow in the blocking hole of the blocking meter according to the set sampling point interval time, and forms a sodium medium flow-sodium medium temperature curve in the next sampling cycle;

[0070] After the sampling point module forms the sodium medium flow-sodium medium temperature curve in the next sampling period, the periodic trigger module resets and triggers the blocking temperature measurement module to determine the sodium medium flow decline inflection point in the next sampling period and output the sodium medium blocking temperature in the next sampling period.

[0071] In this embodiment, as one of the feasible methods, after the blocking temperature measurement module determines the inflection point of the sodium medium flow rate decrease within the sampling period, the sodium medium flow rate decrease inflection point is marked on the sodium medium flow rate curve within the sampling period, and the sodium medium blocking temperature within the sampling period is output.

[0072] In this embodiment, as one of the achievable ways, the blocking temperature measurement module forms a sodium medium blocking temperature curve from the sodium medium blocking temperature points in each sampling period.

[0073] For the same blockage hole of the blockage meter and the same sodium medium, under the same other conditions, the sodium medium blockage temperature within a sampling cycle is manually measured to be 151.1°C, and the sodium medium blockage temperature measurement device measures the sodium medium blockage temperature within a sampling cycle to be 152.49°C. The deviation of the sodium medium blockage temperatures measured by the two is within 4°C, which meets the requirements of personnel for automatic measurement of the blockage meter.

[0074] The commonly used algorithm for determining the sodium medium blocking temperature is the threshold judgment method, which determines whether it is the sodium medium flow inflection point by measuring the sodium medium flow value dropping to a certain percentage or the sodium medium flow value passing through the blocking hole is less than a certain set value. For example, when the sodium medium flow value in the blocking hole drops by 2%, the output is displayed as the sodium medium blocking temperature. This method has certain defects when applied on site. For some blocking meters, when the sodium medium flow curve fluctuates slightly, it will be judged in advance as the sodium medium flow drop inflection point, and the threshold is not easy to determine. When the threshold is set inappropriately, it will cause misjudgment. The sodium medium blocking temperature determination algorithm derived from the second-order derivative idea does not need to determine a certain threshold or set value. By comparing the size relationship between the second-order derivative or slope difference of adjacent points on the curve, the sodium medium flow drop inflection point can be obtained, realizing automatic, simple and accurate measurement of sodium medium blocking temperature.

[0075] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for measuring sodium medium blocking temperature, characterized in that: The following steps are involved: The sodium medium temperature and sodium medium flow rate in the plugging hole of the plugging meter are collected according to the set sampling period and sampling point interval time to form a sodium medium flow rate-sodium medium temperature curve within the sampling period; The second-order derivative of the sodium medium flow curve point within the sampling period is calculated to determine the inflection point of the sodium medium flow decrease within the sampling period; The sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period is output as the sodium medium blocking temperature within the sampling period.

2. The sodium medium blocking temperature measurement method according to claim 1, characterized in that: Calculate the second-order derivative of the sodium medium flow curve point within the sampling period; When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, the point is judged to be the inflection point of the sodium medium flow rate decrease within the sampling period, and the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period is output as the sodium medium blocking temperature within the sampling period.

3. The sodium medium blocking temperature measurement method according to claim 1, characterized in that: Calculate the second-order derivative of the sodium medium flow curve point within the sampling period; When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, and the points within the set time after the point show a decreasing trend, the point is judged to be the inflection point of the sodium medium flow rate decrease within the sampling period, and the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period is output as the sodium medium blocking temperature within the sampling period.

4. The sodium medium blocking temperature measurement method according to claim 2 or 3, characterized in that: After determining the inflection point of the sodium medium flow rate decrease within the sampling period and outputting the sodium medium blocking temperature within the sampling period, stop collecting the sodium medium flow rate and sodium medium temperature within the sampling period, and stop determining the inflection point of the sodium medium flow rate decrease within the sampling period and outputting the sodium medium blocking temperature within the sampling period of the blocking meter.

5. The sodium medium blocking temperature measurement method according to claim 1, characterized in that: After outputting the sodium medium blocking temperature in the previous sampling cycle, reset and trigger to collect the sodium medium temperature and sodium medium flow in the blocking hole of the blocking meter according to the set sampling cycle and sampling point interval time, and form a sodium medium flow-sodium medium temperature curve in the next sampling cycle; After forming the sodium medium flow-sodium medium temperature curve in the next sampling cycle, reset and trigger to determine the sodium medium flow drop inflection point in the next sampling cycle and output the sodium medium blocking temperature in the next sampling cycle.

6. A sodium medium blockage temperature measuring device, characterized in that: include: The sampling point module is used to collect the sodium medium temperature and sodium medium flow rate in the plugging hole of the plugging meter according to the set sampling period and sampling point interval time, and form a sodium medium flow rate-sodium medium temperature curve within the sampling period; The blocking temperature measurement module is used to obtain the second-order derivative of the sodium medium flow curve point within the sampling period, determine the inflection point of the sodium medium flow decline within the sampling period; and output the sodium medium temperature corresponding to the inflection point of the sodium medium flow decline within the sampling period as the sodium medium blocking temperature within the sampling period.

7. The sodium medium blockage temperature measuring device according to claim 6, characterized in that: The blocking temperature measurement module calculates the second-order derivative of the sodium medium flow curve point within the sampling period; When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, the blocking temperature measurement module determines that the point is the inflection point of the sodium medium flow rate decrease within the sampling period, and outputs the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period as the sodium medium blocking temperature within the sampling period.

8. The sodium medium blockage temperature measuring device according to claim 6, characterized in that: The blocking temperature measurement module calculates the second-order derivative of the sodium medium flow curve point within the sampling period; When the second-order derivative of a point is less than 0 and is smaller than the second-order derivatives of the adjacent points before and after the point, and the points within the set time after the point show a decreasing trend, the blocking temperature measurement module determines that the point is the inflection point of the sodium medium flow rate decrease within the sampling period, and outputs the sodium medium temperature corresponding to the inflection point of the sodium medium flow rate decrease within the sampling period as the sodium medium blocking temperature within the sampling period.

9. The sodium medium blockage temperature measuring device according to claim 7 or 8, characterized in that: After determining the sodium medium flow rate decline inflection point within the sampling period and outputting the sodium medium blocking temperature within the sampling period, the blocking temperature measurement module stops collecting the sodium medium flow rate and sodium medium temperature within the sampling period, stops determining the sodium medium flow rate decline inflection point within the sampling period and outputting the sodium medium blocking temperature within the blocking meter sampling period.

10. The sodium medium blockage temperature measuring device according to claim 6, characterized in that: It also includes a periodic trigger module; After the blocking temperature measurement module outputs the sodium medium blocking temperature in the previous sampling cycle, the periodic trigger module resets and triggers the sampling point module to collect the sodium medium temperature and sodium medium flow in the blocking hole of the blocking meter according to the set sampling point interval time, and forms a sodium medium flow-sodium medium temperature curve in the next sampling cycle; After the sampling point module forms the sodium medium flow-sodium medium temperature curve in the next sampling period, the periodic trigger module resets and triggers the blocking temperature measurement module to determine the sodium medium flow decline inflection point in the next sampling period and output the sodium medium blocking temperature in the next sampling period.

Images