Method and device for estimating leakage amount of pipeline valve, valve and storage medium

Abstract

A method for estimating a mass m of leaked water from a pipeline valve per unit time based on an enthalpy difference for the mass m of leaked water, between a starting point of the pipeline and a valv

Description

TECHNICAL FIELD The present invention relates to the technical field of pipeline detection, and more particularly to a method and device for estimating the leakage amount of a pipeline valve, a valve and a storage medium. BACKGROUND One of the functions of valves in piping systems is to block fluid flow. When there are defects on the valve sealing surface, it may lead to poor sealing of the valve. The consequence is that although the valve is in the closed state, fluid can still pass through, which is known as internal leakage. The internal leakage rate of valves is generally low and difficult to measure through conventional methods. For valves with significant temperature and pressure differences between the upstream and downstream sides, the internal leakage rate may gradually increase over time. In the prior art, there are two methods to detect the leakage rate of pipeline valves for determining the internal leakage rate. One is the quantitative technology for valve internal leakage rate based on acoustic emission signals. Due to the pressure difference between the upstream and downstream of the valve, valve internal leakage will generate noise signals. Acoustic emission valve internal leakage rate detection involves detecting the acoustic signals of valve internal leakage, processing and extracting characteristic signals, and establishing a correlation between the characteristic signals and the valve internal leakage rate based on experiments, deep learning, and neural network algorithms. The other is the quantitative technology for valve internal leakage rate based on infrared thermography. When high-temperature fluid inside the pipeline at the valve inlet leaks into the downstream pipeline, it will cause changes in the temperature distribution of the downstream pipeline wall, which will be reflected in the infrared thermography signals. Infrared thermography valve internal leakage rate detection involves collecting infrared thermography signals of the pipeline and establishing a correlation between the infrared signals and the valve internal leakage rate based on experiments, deep learning, and neural network algorithms. Although the aforementioned methods can accurately obtain the internal leakage rate of valves, they are time-consuming and costly. In nuclear power plants, some pipelines are only occasionally used under specific operating conditions of the unit, and the pipeline valves remain closed for most of the unit’s operating time. If internal leakage occurs in the normally closed valves of such pipelines, it will result in unintended discharge of fluid from the upstream to the downstream of the pipeline. Moreover, the internal leakage amount of valves is generally small, and the leakage amount cannot be accurately measured by methods such as ultrasonic flowmeters. On the other hand, once internal leakage is detected in normally closed valves during engineering operations, there is often no strong demand for precise leakage rate measurement. Instead, a quick and economical method is needed to estimate the internal leakage rate of the valve. Therefore, there is an urgent need for a method for estimating the leakage amount of a pipeline valve to solve the above technical problems. SUMMARY An objective of the present invention to provide a method and device for estimating the leakage amount of a pipeline valve, a valve and a storage medium that can quickly and economically estimate the internal leakage rate of the valve. To achieve this objective, the present invention adopts the following technical solutions: a method for estimating the leakage amount of a pipeline valve, including the steps of: setting the mass of leaked water from a valve per unit time as m, obtaining an enthalpy difference AH of the leaked water of the mass m at a starting point of a pipeline and a valve inlet, and a pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline; and obtaining the mass m of the leaked water from the valve per unit time based on the enthalpy difference AH and the pipeline heat dissipation amount AQ. As a preferred technical solution of the above method for estimating the leakage amount of a pipeline valve, obtaining the enthalpy difference AH of the leaked water of the mass m at the starting point of the pipeline and the valve inlet including: obtaining thermal power QI conducted from an exposed inner wall of the pipeline at the valve inlet to an outer wall of the pipeline and thermal power Q2 of convection heat dissipation between the exposed outer wall of the pipeline per unit length at the valve inlet and the ambient air, wherein 1 s ¢2 ^1^2 +OMV W Tin represents the temperature of the exposed inner wall of the pipeline at the valve inlet; To represents the temperature of the exposed outer wall of the pipeline at the valve inlet; Y represents the thermal conductivity of the pipeline wall; n and r2 represent the radii of the inner and outer walls of the pipeline at the valve inlet, respectively; and Tf represents the ambient temperature; obtaining the temperature Tin of the exposed inner wall of the pipeline at the valve inlet based on QI and Q2; obtaining a specific enthalpy h2 of the water at the valve inlet based on the temperature Tin of the exposed inner wall of the pipeline at the valve inlet; obtaining a specific enthalpy hi of the water at the pipeline starting point based on the water temperature at the pipeline starting point; and Afi *" Ah.___h A obtaining an enthalpy difference ■ ■ * ■ of the leaked water of the mass m at the pipeline starting point and the valve inlet based on the specific enthalpy h2 and the specific enthalpy hi. As a preferred technical solution of the above method for estimating the leakage amount of a pipeline valve, obtaining the temperature Tin of the exposed inner wall of the pipeline at the valve inlet based on QI and Q2 including: iWHWk- % 1 ............................................................ letting Afe, then obtaining ’f As a preferred technical solution of the above method for estimating the leakage amount of a pipeline valve, obtaining the pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline including: obtaining a heat flux density qi of insulation heat dissipation for a pipeline segment within each temperature zone, an insulation surface area Si for a pipeline segment within each temperature zone, and average heat dissipation power Qi for insulation of a pipeline segment within each temperature zone, wherein P represents an average density of water inside the pipeline, and a flow velocity of m v =--- water inside the pipeline is V, then P™!; the time required for the leaked water of L Lpnr? the mass m to flow through the pipeline of length L is t, then v m ; an internal leakage rate of the valve is set to be constant, then the time required for the leaked water of the mass m to flow through the pipeline segment in a different temperature zone is directly proportional to the length Xi of the pipeline segment, i.e., the time required to flow through the pipeline segment in the different temperature zone is the pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline is equal to the sum of the heat loss incurred by the leaked water of the mass m flowing through the pipeline segments in different temperature zones, based on the above-mentioned formulas Qi and ti are substituted to obtain wherein, L represents the total length of the pipeline, Xi represents the proportion of the length of the pipeline segment within each different ambient temperature zone to the total length, rs represents the radius of an insulated outer surface of the pipeline, the average temperature of the insulated surface of the pipeline segment in each different ambient temperature zone is Twi, and the ambient temperature in different zones is Th. As a preferred technical solution of the above method for estimating the leakage amount of a pipeline valve, obtaining the mass m of the leaked water from the valve per unit time based on the enthalpy difference AH and the heat dissipation amount AQ including: bar, LS43? 4 - L)! ■ (L * L) - letting A then obtaining 'i 81 As a preferred technical solution of the above method for estimating the leakage amount of a pipeline valve, the specific enthalpy hi of the water at the starting point of the pipeline is determined based on the temperature and pressure of the water at the starting point of the pipeline; the specific enthalpy h2 of the water at the valve inlet is determined based on the temperature and pressure of the water at the valve inlet. The present invention also provides a device for estimating the leakage amount of a pipeline valve, configured to perform the method for estimating the leakage amount of a pipeline valve according to any one of the above solutions, including: a data acquisition module, configured to obtain an enthalpy difference AH of the leaked water of the mass m at a starting point of a pipeline and a valve inlet, and a pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline; and a data processing module, configured to calculate the mass of the leaked water from the valve per unit time based on the enthalpy difference AH and the pipeline heat dissipation amount AQ. As a preferred technical solution of the above device for estimating the leakage amount of a pipeline valve described above, the data acquisition module includes a first acquisition unit, a second acquisition unit, a third acquisition unit and a fourth acquisition unit, and the data processing module includes a first data processing unit, a second data processing unit and a third data processing unit; the first acquisition unit is configured to acquire thermal power QI conducted from an exposed inner wall of the pipeline at the valve inlet to an outer wall of the pipeline and thermal power Q2 of convection heat dissipation between the exposed outer wall of Ql = ——-the pipeline at the valve inlet and the ambient air, wherein i , Q2 = hrf [9.432+a®(^-TF)b(r»-TF); the second acquisition unit is configured to acquire the temperature Tin of the exposed inner wall of the pipeline at the valve inlet, wherein i; 0 fl - TOP (¾ - TFb T- - x r * ; the third acquisition unit is configured to acquire average heat dissipation power Qi for insulation of a pipeline segment within each temperature zone, wherein the fourth acquisition unit is configured to acquire the time ti required by the leaked water of the mass m from the valve per unit time to flow through the pipeline segment in each different temperature zone, wherein t; = vt--^'X<; the first data processing unit obtains an enthalpy difference AH of the leaked water of the mass m based on the specific enthalpy hi of the water at the pipeline starting point and the specific enthalpy hi of the water at the valve inlet; wherein M = Hl' 0¾ - kJ; the second data processing unit obtains AQ based on AQ~5 AQi~5 Qi ■ q, wherein and the third data processing unit calculates the mass m of the leaked water from the valve per unit time based on the enthalpy difference AH and the heat dissipation amount AQ, wherein = The present invention also provides a valve, including a pipeline and a valve body, the valve body being arranged at one end of the pipeline, and further including: a controller; a temperature sensor, configured to detect the outer surface temperature of the pipeline wall and the ambient temperature, and to transmit the detected outer surface temperature of the pipeline wall and the ambient temperature to the controller; a pressure sensor, configured to detect the water pressures at the starting point of the pipeline and at the valve body, and to transmit the detected pressures at the starting point of the pipeline and at the valve body to the controller; and a memory, configured to store one or more programs; wherein when the one or more programs are executed by the controller, the controller controls the valve to implement the method for estimating the leakage amount of a pipeline valve according to any one of the above solutions. A storage medium having a computer program stored thereon, when the program is executed by a controller, the valve implements the method for estimating the leakage amount of a pipeline valve according to any one of the above solutions. The present invention has at least the following beneficial effects: in an embodiment of the present invention, according to the relationship between the mass m of the leaked water from the valve per unit time and the enthalpy difference AH of the leaked water at a starting point of a pipeline and a valve inlet, and based on the relationship between the heat dissipation amount for pipeline insulation AQ and the mass m of the leaked water from the valve per unit time, the mass m of the leaked water from the valve per unit time is obtained. Since m represents the mass of leaked water from the valve per unit time, m is therefore the internal leakage rate of the valve. Compared with the prior art, the method can calculate the mass m of the leaked water from the valve based on the temperature values of relevant parts, the inner and outer radii of the pipeline, and other parameters, by using thermodynamic principles. The calculation process is simple and convenient, requiring neither complex detection tools nor professionals. The calculation results can provide a reference for practical engineering assessments. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly explain the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to the contents of the embodiments of the present invention and these drawings without making creative labor for those skilled in the art. FIG. 1 is a flowchart illustrating a method for estimating the leakage amount of a pipeline valve according to the present invention; FIG. 2 is a schematic block diagram of a pipeline valve position according to the present invention; FIG. 3 is a block diagram of a device for estimating the leakage amount of a pipeline valve according to the present invention; and FIG. 4 is a block diagram of a valve according to the present invention. In the drawings: 201, controller; 202, temperature sensor; 203, pressure sensor; 204, memory; 301, data acquisition module; 302, data processing module. DETAILED DESCRIPTION The present invention will now be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for illustration of the invention, and are not intended to limit the invention. In addition, it should be noted that, for convenience of description, only some, but not all, structures related to the present invention are shown in the drawings. In the description of the present invention, unless expressly specified and limited otherwise, the terms “connected”, “connection”, and “fixed” are to be understood broadly, for example, conenction may be fixed connection, detachable connection, or integred connection; the connection may be mechanical or electrical connection; connection may be direct connection or indirect connection through an intermediate medium, or it can be the internal communication of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention will be understood by those skilled in the art. In the present invention, unless expressly specified and defined otherwise, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact or that the first and second features are not in direct contact but are in contact through another feature between them. Also, a first feature being “above”, “over” or “on” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is at a higher level than the second feature. A first feature being “below”, “beneath” or “under” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is at a lower level than the second feature. In the description of the present embodiment, the terms “upper”, “lower”, “right”, and other directional or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. These terms are solely for the purpose of facilitating description and simplifying operations, and do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, or operate in specific orientations. Therefore, they should not be understood as limitations of the invention. Additionally, the terms “first” and “second” are merely used for distinction in description and do not have special meanings. Embodiments of the present invention provide a method for estimating the leakage amount of a pipeline valve, which can estimates the internal leakage rate of the valve based on the temperature obtained by the sensor. Compared to the prior art, the procedure is simple and the estimation cost is low. As shown in FIG. 1, a method for estimating the leakage amount of a pipeline valve includes the following steps: S101, the mass of leaked water from a valve per unit time is set as m, an enthalpy difference AH of the leaked water of the mass m at a starting point of a pipeline and a valve inlet, and a pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline are obtained; it should be noted that the enthalpy difference AH can be obtained by querying the specific enthalpy data in the water property table based on the temperatures and pressures of the water at the pipeline starting point and the valve inlet, and m represents the mass of the leaked water per unit time. As shown in FIG. 2, the temperature and pressure parameters of the water at the pipeline starting point A can be directly obtained through the power plant monitoring system. The water temperature inside the pipeline at the valve inlet B can be calculated based on the pipeline outer wall temperature, ambient temperature, and principles of heat transfer. SI02, the mass m of the leaked water from the valve per unit time is obtained based on the enthalpy difference AH and the pipeline heat dissipation amount AQ. In an embodiment of the present invention, according to the relationship between the mass m of the leaked water from the valve per unit time and the enthalpy difference AH of the leaked water at a starting point of a pipeline and a valve inlet, and based on the relationship between the heat dissipation amount for pipeline insulation AQ and the mass m of the leaked water from the valve per unit time, the mass m of the leaked water from the valve per unit time is obtained. Compared with the prior art, the method can calculate the mass m of the leaked water from the valve based on the temperature values of relevant parts, the inner and outer radii of the pipeline, and other parameters, by using thermodynamic principles. The calculation process is simple and convenient, requiring neither complex detection tools nor professionals. The calculation results can provide a reference for practical engineering assessments. Specifically, in some embodiments, obtaining the enthalpy difference AH of the leaked water of the mass m at the starting point A of the pipeline and the valve inlet B includes: obtaining thermal power QI conducted from an exposed inner wall of the pipeline at the valve inlet B to an outer wall of the pipeline and thermal power Q2 of convection heat dissipation between the exposed outer wall of the pipeline per unit length at the valve inlet and the ambient air, wherein Q2 [M2 Tin represents the temperature of the exposed inner wall of the pipeline at the valve inlet B; To represents the temperature of the exposed outer wall of the pipeline at the valve inlet B; Y represents the thermal conductivity of the pipeline wall; n and r2 represent the radii of the inner and outer walls of the pipeline at the valve inlet B, respectively; and Tf represents the ambient temperature; the temperature Tin of the exposed inner wall of the pipeline at the valve inlet is obtained based on QI and Q2 (i.e., the water temperature at the valve inlet), specifically, the water temperature at the valve inlet B; the specific enthalpy h2 of the water at the valve inlet is obtained based on the temperature Tin of the exposed inner wall of the pipeline at the valve inlet; the specific enthalpy hi of the water at the pipeline starting point is obtained based on the water temperature at the pipeline starting point; and the water temperature at the starting point of the pipeline can be directly read from the monitoring system of the power plant or obtained by referring to the calculation method for water temperature at the valve inlet. AH pi *h- h" j An enthalpy difference 's * is obtained based on the specific enthalpy h2 and the specific enthalpy hi, as well as the mass m. In some embodiments, obtaining the temperature Tin of the exposed inner wall of the pipeline at the valve inlet based on QI and Q2 includes: v™---— letting then obtaining Y In practical application scenarios, the starting point A of the pipeline is usually connected to a normally open process pipeline, and the temperature and pressure of the water at this position can usually be directly obtained by querying the monitoring system of the nuclear power plant. However, the temperature of the water inside the pipeline at the inlet B of the internally leaking valve needs to be calculated. The insulation layer of the pipeline at the valve inlet B is removed, and after the outer wall temperature of the pipeline stabilizes, the outer surface temperature To of the metal pipeline wall at the valve inlet B and the ambient temperature Tf are measured. The calculation formula for QI is a typical cylindrical wall heat conduction model formula, which is based on the fundamental principles of heat transfer. The heat exchange process between the outer surface of the pipeline wall and the air belongs to convective heat transfer. The convective heat dissipation process between the metal pipeline and air is relatively complex and influenced by numerous factors, so there is no universal calculation formula. For the convective heat dissipation process between the pipeline and the air, reference can be made to the methods given in GB / T17357-2008 “In-situ measurements of heat loss through thermal insulation of equipment and pipes-Heat flow meter apparatus and surface temperature method” to determine the thermal power of convective heat dissipation between the exposed pipeline at the valve inlet B and the ambient air. It can be assumed that the water temperature in the pipeline at the valve inlet B is the same as the temperature Tin of the inner wall of the exposed pipeline at the valve inlet B. The water pressure corresponding to the temperature Tin can be determined by referring to the pressure at the starting point of the pipeline. It can be understood that the water pressure at various positions in a slowly flowing pipeline is approximately the same. In some embodiments, obtaining the pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline specifically includes: obtaining a heat flux density qi of insulation heat dissipation for a pipeline segment within each temperature zone, an insulation surface area Si for a pipeline segment within each temperature zone, and average heat dissipation power Qi for insulation of a .4.4 t VWl Igp P represents an average density of water inside the pipeline, and a flow velocity of m V = --------2 water inside the pipeline is V, then PW; the time required for the leaked water of L Lpurf the mass m to flow through the pipeline of length L is t, then v m ; an internal leakage rate of the valve is set to be constant, then the time required for the leaked water of the mass m to flow through the pipeline segment in a different temperature zone is directly proportional to the length Xi of the pipeline segment, i.e., the time required to flow through the pipeline segment in the different temperature UM zone is ® ; the pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline is equal to the sum of the heat loss incurred by the leaked water of the mass m flowing through the pipeline + • .... + + + . . segments in different temperature zones, based on , the above-mentioned formulas Qi and ti are substituted to obtain v ...... } iQ — --------- ) 1 * ' • 10 >1 j, - iS . wherein, L represents the total length of the pipeline, Xi represents the proportion of the length of the pipeline segment within each different ambient temperature zone to the total length, rs represents the radius of an insulated outer surface of the pipeline, the average temperature of the insulated surface of the pipeline segment in each different ambient temperature zone is Twi, and the ambient temperature in different zones is Th. In some embodiments, the specific enthalpy hi of the water at the starting point of the pipeline is determined based on the temperature and pressure of the water at the starting point of the pipeline; the specific enthalpy h2 of the water at the valve inlet is determined based on the temperature and pressure of the water at the valve inlet. When the valve has no leakage, the water in the upstream pipeline is in a static state of non-flow, and as time passes, the water temperature will converge with the ambient temperature. When a valve has internal leakage, high-temperature water from the upstream will flow towards the valve from the starting point, resulting in an increase in temperature of the water, the metal pipeline wall, and the insulation layer in the pipeline before the valve. During this process, as the high-temperature water from the upstream gradually flows towards the valve, the heat of the high-temperature water will continue to dissipate into the outside air through the pipeline wall and the insulation layer, further causing the water temperature to decrease continuously. Obviously, the faster the valve leakage rate, the faster the high-temperature water at the pipeline starting point flows towards the valve, and the less heat is dissipated during the flow, so the water temperature at the valve inlet will be higher. In other words, there is a quantitative relationship between the valve leakage rate and the energy difference of the high-temperature water between the positions at the pipeline starting point and the valve inlet. This solution calculates the aforementioned energy difference through two methods: one method involves obtaining the temperatures and pressures of the water at the pipeline starting point and the valve inlet, querying the physical property table of water to obtain the specific enthalpy values at these two positions, and then obtaining the enthalpy difference AH of the leaked water of the mass m. The water temperatures in the pipeline at these two positions can be directly read from the monitoring system of the nuclear power plant or obtained through thermodynamic calculations. The second method involves calculating the total heat dissipation amount AQ during the process of the upstream high-temperature water flowing through the entire length of the pipeline. For the pipeline that traverses a plurality of temperature zones, the total heat dissipation amount of the high-temperature water flowing through the entire length of the pipeline is equal to the sum of the heat dissipation amounts of respective pipeline segments in different temperature zones. Obviously, the energy differences obtained by the above two methods are numerically equal, i.e. AH=AQ, based on this, the mass m of the leaked water from the valve per !—--------------:—:—l unit time can be solved, '1 2 For example, Table 1 presents the calculation parameters for the internal leakage rate of a valve. As shown in FIG. 2, the pipeline traverses three different floors / ambient temperature zones. Based on the principle of heat balance, QI = Q2. By substituting the data in Table 1 into the calculation, the the temperature Tin of the exposed inner wall of the pipeline at the valve inlet B is 190°C, which is also the water temperature at the valve inlet B. As shown in FIG. 2, based on the parameters of the water at the pipeline starting point A and the valve inlet B, the physical property table of water is consulted to obtain the specific enthalpy values at positions A and B, and the enthalpy difference of the water at these two positions is obtained, which is approximately 165.8 KJ / Kg. Corresponding to the mass m of the leaked water from the valve per unit time, the enthalpy difference of the water at the pipeline starting point A and the valve inlet B is: The pipeline heat dissipation amount AQ during the process of the leaked water of the mass m from the valve flowing through the entire length of the pipeline is equal to the sum of the heat dissipation amounts AQi incurred by the leaked water of the mass m flowing through the pipeline segments in different temperature zones, The heat dissipation amount AQi of each pipeline segment in a different temperature zone is equal to the product of the insulation heat dissipation power Qi of the segment m fl fl    t AQi ~ Qi ‘ ti and the flow time b: XI XI u. The time ti required for the leaked water of the mass m to flow through the pipeline segment in a different temperature zone is directly proportional to the length Xi of the pipeline segment in the area, and ! : ' m The meanings of the parameters in the formulas are shown in Table 1. The insulation heat dissipation power Qi of the segment in the different temperature zone is calculated according to the methods in GB / T17357-2008 “In-situ measurements of heat loss through thermal insulation of equipment and pipes-Heat flow meter apparatus and surface temperature method”. Considering that the pipeline between the starting point A of the feedwater long-loop pipeline and the leaking valve spans across three floors / temperature zones, there are significant differences in the insulation outer surface temperature, ambient air temperature, and pipeline length arranged on different floors. In order to reduce the calculation error of pipeline insulation heat dissipation, the method of calculating the insulation heat dissipation amounts of the pipeline segments in the different temperature zones by floor segments and summing up to obtain the total heat loss is AQ ~ / AQi ™ / Q| • tj adopted, i.e., By combining the above formulas, th following formula can be obtained: AQ=•) !W2+M5& - y| ■  ~ IsH iii . 4»* Wherein, the subscript i=l, 2, 3 represents the three floors (temperature zones) respectively, Twi represents the insulation outer surface temperature of the corresponding floor (temperature zone), Tf; represents the ambient temperature of the corresponding floor (temperature zone) (i.e., the ambient temperature in a different zone), and x; represents the proportion of the pipeline length of the corresponding floor (temperature zone) to the total pipeline length. The values of the parameters in the formula are given in Table 1. 6.37x10« =-- After substituting the values of the parameters in Table 1, ® can be obtained. By letting AH=AQ, the internal leakage mass of the regulator valve is about 6.19 Kg / s. Table 1 Valve leakage rate calculation parameters Parameters Value Inner radius n (mm) of pipeline 164. 5 Insulation radius r2 (mm) of pipeline 382 Total length L (m) of pipeline before valve 39.16 Density p (Kg / m2) of water at 210°C 857.6 Temperature Twi (°C) of insulation outer surface of pipeline on different floors 33.0 (i=l) 26.2 (i=2) 21.9 (i=3) Ambient temperature Tn (°C) on different floors 24.3 (i=l) 21.4 (i=2) 17.9 (i=3) Proportion Xi of pipeline length on different floors to total length of pipeline before valve 0.05 (i=l) 0.2 (i=2) 0.75 (i=3) Water specific enthalpy value hi (KJ / Kg) at pipeline starting point A (obtained by querying a physical property table) 973.4 Specific enthalpy value h2 (KJ / Kg) of water at 190°C (obtained by querying a physical property table) 807.6 Compared to existing valve leakage rate quantification methods, the embodiments provided herein have the following advantages: 1. Wide applicability: fundamental thermodynamic principles are utilized, which are suitable for addressing valve internal leakage problems in all high-temperature fluid pipelines. 2. Convenience, rapidness, and ease of operation: the calculation method requires simple input parameters that are easy to obtain, thus eliminating the need for complex testing equipment and software simulations. 3. Low cost: ordinary engineers can master the method after training, thus eliminating the need to outsource professional technical teams for implementation. The embodiment of the present invention further provides a device for estimating the leakage amount of a pipeline valve, configured to perform the method for estimating the leakage amount of a pipeline valve provided by the embodiment of the present invention, as shown in FIG. 3, the device for estimating the leakage amount of a pipeline valve includes a data acquisition module 301 and a data processing module 302: the data acquisition module 301 is configured to obtain an enthalpy difference AH of the leaked water of the mass m at a starting point of a pipeline and a valve inlet, and a pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline; and the data processing module 302 is configured to calculate the mass of the leaked water from the valve per unit time based on the enthalpy difference AH and the pipeline heat dissipation amount AQ; wherein , hi represents the specific enthalpy hi of the water at the pipeline starting point, h2 represnts the specific enthalpy h2 of the water at the valve inlet, L represents the total length of the pipeline, Xi represents the proportion of the length of the pipeline segment within each different ambient temperature zone to the total length, rs represents the radius of an insulated outer surface of the pipeline, the average temperature of the insulated surface of the pipeline segment in each different ambient temperature zone is Twi, the ambient temperature is Th, and Xi represents the proportion of the length of the pipeline segment within each different ambient temperature zone to the total length. Specifically, the data acquisition module 301 includes a first acquisition unit, a second acquisition unit, a third acquisition unit and a fourth acquisition unit, and the data processing module 302 includes a first data processing unit, a second data processing unit and a third data processing unit, wherein: the first acquisition unit is configured to acquire thermal power QI conducted from an exposed pipeline on the valve upstream to an outer wall of the pipeline and thermal power Q2 of convection heat dissipation between the exposed outer wall of the pipeline per unit length on the valve upstream and the ambient air, wherein «■****» 5 Q2 = 2;Tiy [9.432^ the second acquisition unit is configured to acquire the temperature Tin of the exposed inner wall of the pipeline at the valve inlet, wherein r; ■ p.433 r $4¾ - TOI' ’ &r the third acquisition unit is configured to acquire thermal power Qi for insulation of a pipeline segment within each temperature zone, wherein the fourth acquisition unit is configured to acquire the time ti required by the leaked water of the mass m from the valve per unit time to flow through the pipeline segment in each different temperature zone, wherein = ■{-—-•$; the first data processing unit obtains an enthalpy difference AH based on the specific enthalpy hi of the water at the pipeline starting point and the specific enthalpy h2 of the water at the valve inlet; wherein AH s®* (1¾ ~ h J; the second data processing unit obtains AQ based on AQ = —J AQi::: / Qfh, wherein - ±2212 -7t _ y, - 2 and the third data processing unit calculates the mass m of the leaked water from the valve per unit time based on the enthalpy difference AH and the heat dissipation amount AQ, wherein , v !. 1 i The device for estimating the leakage amount of a pipeline valve provided by the embodiment obtains the enthalpy difference AH of the leaked water of the mass m at a starting point of a pipeline and a valve inlet, and the heat dissipation amount AQ during the process of the leaked water flowing through the pipeline through the data acquisition module 301, and obtains the mass m of the leaked water from the valve per unit time based on the enthalpy difference AH and the pipeline heat dissipation amount AQ through the data processing module 302. The device for estimating the leakage amount of a pipeline valve can calculate the mass m of the leaked water from the valve (i.e., the internal leakage rate of the valve) based on the temperature values of relevant parts, the diameter of the pipeline, and in combination with thermodynamic principles. The calculation process is simple and convenient, requiring neither complex detection tools nor professionals. The calculation results can provide a reference for practical engineering assessments. FIG. 4 is a block diagram of a valve according to an embodiment of the present invention. As shown in FIG. 4, the embodiment of the present invention provides a valve including a pipeline and a valve body, the valve body being arranged at one end of the pipeline. The valve further includes a controller 201, a temperature sensor 202, a pressure sensor 203 and a memory 204. The temperature sensor 202 is configured to detect the outer surface temperature of the pipeline wall and the ambient temperature, and to transmit the detected outer surface temperature of the pipeline wall and the ambient temperature to the controller 201; the pressure sensor 203 is configured to detect the water pressures at the starting point of the pipeline and at the valve body, and to transmit the detected pressures at the starting point of the pipeline and at the valve body to the controller 201; and the memory 204 is configured to store one or more programs; wherein when the one or more programs are executed by the controller, the controller 201 controls the valve to implement the method for estimating the leakage amount of a pipeline valve provided by embodiments of the present invention. As a computer-readable storage medium, the memory 204 can be used to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the method for estimating the leakage amount of a pipeline valve in the embodiment of the present invention. The controller 201 executes various functional applications and data processing of the valve by running software programs, instructions, and modules stored in the memory 204, that is, implements the method for estimating the leakage amount of a pipeline valve of the above-described embodiment. The memory 204 mainly includes a stored program area and a stored data area, wherein, the stored program area can store an operating system, an application program required by at least one function; the stored data area may store data created according to the use of the terminal, and the like. In addition, the memory 204 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state memory device. In some examples, the memory 204 may further include a memory 204 remotely located with respect to the controller 201, which may be connected to the valves through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communications network, and combinations thereof. The valve provided by the embodiment of the present invention belongs to the same inventive concept as the method for estimating the leakage amount of a pipeline valve provided by the above embodiment, the technical details which are not described in detail in the present embodiment can be referred to the above embodiment, and the present embodiment has the same advantageous effects of performing the method for estimating the leakage amount of a pipeline valve. An embodiment of the present invention also provides a storage medium having stored thereon a computer program which, when executed by a controller, implements the method for estimating the leakage amount of a pipeline valve according to the above embodiment of the present invention. Of course, an embodiment of the present invention provides a storage medium containing computer-executable instructions, the computer-executable instructions thereof are not limited to the operations in the method for estimating the leakage amount of a pipeline valve as described above, but may also perform the relevant operations in the method for estimating the leakage amount of a pipeline valve provided by the embodiments of the present invention, and have corresponding functions and advantageous effects. From the above description of the embodiments, it will be clear to those skilled in the art that the present invention can be implemented by means of software and necessary general purpose hardware, and of course can be implemented by means of hardware, but the former is the better embodiment in many cases. Based on such understanding, the technical solution of the present invention, in essence, or the part contributing to the prior art, can be embodied in the form of a software product, the computer software product may be stored in a computer-readable storage medium, for example, a floppy disk, a ROM, a RAM, a FLASH, a hard disk, or an optical disk of a computer includes instructions for causing a computer device (e.g., a robot, a PC, a server, a network device, or the like) to perform the method for estimating the leakage amount of a pipeline valve according to various embodiments of the present invention. Furthermore, the foregoing is merely the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious variations, readjustments and substitutions will occur to those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in more detail with reference to the above embodiments, the present invention is not limited to the above embodiments, but can include many other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for estimating the leakage amount of a pipeline valve, characterized by comprising the steps of:setting the mass of leaked water from a valve per unit time as m, obtaining an enthalpy difference AH of the leaked water of the mass m at a starting point of a pipeline and a valve inlet, and a pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline;obtaining the enthalpy difference AH of the leaked water of the mass m at the starting point of the pipeline and the valve inlet comprising:obtaining thermal power QI conducted from an exposed inner wall of the pipeline at the valve inlet to an outer wall of the pipeline and thermal power Q2 of convection heat dissipation between the exposed outer wall of the pipeline per unit length at theALAvalve inlet and the ambient air, wherein■WA®■ [9.® + WiTj - Tfj] ■ ft - Tf).Tin represents the temperature of the exposed inner wall of the pipeline at the valve inlet; To represents the temperature of the exposed outer wall of the pipeline at the valve inlet; Y represents the thermal conductivity of the pipeline wall; n and r2 represent the radii of the inner and outer walls of the pipeline at the valve inlet, respectively; and Tf represents the ambient temperature;obtaining the temperature Tin of the exposed inner wall of the pipeline at the valve inlet based on QI and Q2;obtaining a specific enthalpy h2 of the water at the valve inlet based on the temperature Tin of the exposed inner wall of the pipeline at the valve inlet;obtaining a specific enthalpy hi of the water at the pipeline starting point based on the water temperature at the pipeline starting point; andAM w h —n* jobtaining an enthalpy difference !S1 « of the leaked water of themass m at the pipeline starting point and the valve inlet based on the specific enthalpy h2 and the specific enthalpy hi;obtaining the temperature Tin of the exposed inner wall of the pipeline at the valve inlet based on QI and Q2 comprising:WO 0. W L - %~ ™----—----0 ¾letting 0¾ then obtaining J ;obtaining the pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline comprising:obtaining a heat flux density qi of insulation heat dissipation for a pipeline segment within each temperature zone, an insulation surface area Si for a pipeline segment within each temperature zone, and average heat dissipation power Qi for insulation of a pipeline segment within each temperature zone, whereinQ. 2¾ L >f 0.0¾ ~ ’ (¾ "%);P represents an average density of water inside the pipeline, and a flow velocity mof water inside the pipeline is V, then ; the time required for the leaked waterL Lp-nr^of the mass m to flow through the pipeline of length L is t, then V m ; an internal leakage rate of the valve is set to be constant, then the time required for theleaked water of the mass m to flow through the pipeline segment in a different temperature zone is directly proportional to the length Xi of the pipeline segment, i.e., the time required to flow through the pipeline segment in the different temperaturezone is ® ;the pipeline heat dissipation amount AQ during the process of the leaked water ofthe mass m flowing through the entire length of the pipeline is equal to the sum of theheat loss incurred by the leaked water of the mass m flowing through the pipelinesegments in different temperature zones, based ontheabove-mentioned formulas Qi and ti are substituted to obtain. $ X .... . X, .,.-wherein, L represents the total length of the pipeline, Xi represents the proportion of the length of the pipeline segment within each different ambient temperature zone to the total length, r? represents the radius of an insulated outer surface of the pipeline, the average temperature of the insulated surface of the pipeline segment in each different ambient temperature zone is Twi, and the ambient temperature in different zones is Th; andobtaining the mass m of the leaked water from the valve per unit time based on the enthalpy difference AH and the heat dissipation amount AQ comprising:letting A H” A Q, then obtaining2. The method for estimating the leakage amount of a pipeline valve according to claim 1, characterized in that the specific enthalpy hi of the water at the starting point of the pipeline is determined based on the temperature and pressure of the water at the starting point of the pipeline; the specific enthalpy h2 of the water at the valve inlet is determined based on the temperature and pressure of the water at the valve inlet.

3. A device for estimating the leakage amount of a pipeline valve, configured to perform the method for estimating the leakage amount of a pipeline valve according to claim 1 or 2, characterized by comprising:a data acquisition module, configured to obtain an enthalpy difference AH of the leaked water of the mass m at a starting point of a pipeline and a valve inlet, and a pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline; anda data processing module, configured to calculate the mass of the leaked water from the valve per unit time based on the enthalpy difference AH and the pipeline heat dissipation amount AQ; whereinthe data acquisition module comprises a first acquisition unit, a second acquisition unit, a third acquisition unit and a fourth acquisition unit, and the data processing module comprises a first data processing unit, a second data processing unit and a third data processing unit;the first acquisition unit is configured to acquire thermal power QI conductedfrom an exposed inner wall of the pipeline at the valve inlet to an outer wall of thepipeline and thermal power Q2 of convection heat dissipation between the exposedouter wall of the pipeline at the valve inlet and the ambient air, whereinQ2 - 21¾ <[9432+OlWo - Tf)H^the second acquisition unit is configured to acquire the temperature Tin of the exposed inner wall of the pipeline at the valve inlet, wherein- p-tVTJ 1¾the third acquisition unit is configured to acquire average heat dissipation power Qi for insulation of a pipeline segment within each temperature zone, whereinQ( = qr Sj = 2^L • [9432 i 0.05(¾ - TR)J • (¾ -1¾the fourth acquisition unit is configured to acquire the time ti required by the leaked water of the mass m from the valve per unit time to flow through the pipeline• i vrr . • Wsegment in each different temperature zone, wherein =X; ■ t = —-■ c;the first data processing unit obtains an enthalpy difference AH of the leaked water of the mass m based on the specific enthalpy hi of the water at the pipeline starting point and the specific enthalpy h2 of the water at the valve inlet; wherein ~ n? (h - hfl;the second data processing unit obtains AQ based on, . SWfOj V’. <• . , ,wherein andAQthe third data processing unit calculates the mass m of the leaked water from the valve per unit time based on the enthalpy difference AH and the heat dissipationamount AQ, wherein4. A valve, comprising a pipeline and a valve body, the valve body being arranged at one end of the pipeline, characterized by further comprising:a controller;a temperature sensor, configured to detect the outer surface temperature of the pipeline wall and the ambient temperature, and to transmit the detected outer surface temperature of the pipeline wall and the ambient temperature to the controller;a pressure sensor, configured to detect the water pressures at the starting point of the pipeline and at the valve body, and to transmit the detected pressures at the starting point of the pipeline and at the valve body to the controller; anda memory, configured to store one or more programs; whereinwhen the one or more programs are executed by the controller, the controller controls the valve to implement the method for estimating the leakage amount of a pipeline valve according to claim 1 or 2.

5. A storage medium having a computer program stored thereon, characterized in that when the program is executed by a controller, the valve implements the method for estimating the leakage amount of a pipeline valve according to claim 1 or 2.Claims11 12 251. A method for estimating the leakage amount of a pipeline valve, characterized by comprising the steps of:setting the mass of leaked water from a valve per unit time as m, obtaining an enthalpy difference AH of the leaked water of the mass m at a starting point of a pipeline and a valve inlet, and a pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline;obtaining the enthalpy difference AH of the leaked water of the mass m at the starting point of the pipeline and the valve inlet comprising:obtaining thermal power QI conducted from an exposed inner wall of the pipeline at the valve inlet to an exposed outer wall of the pipeline and thermal power Q2 of convection heat dissipation between the exposed outer wall of the pipeline per unitlength at the valve inlet and the ambient air, whereinTin represents the temperature of the exposed inner wall of the pipeline at the valve inlet; To represents the temperature of the exposed outer wall of the pipeline at the valve inlet; Y represents the thermal conductivity of the pipeline wall; n and r2 represent the radii of the exposed inner and outer walls of the pipeline at the valve inlet, respectively; and Tf represents the ambient temperature;obtaining the temperature Tin of the exposed inner wall of the pipeline at the valve inlet based on QI and Q2;11 12 25obtaining a specific enthalpy h2 of the water at the valve inlet based on the temperature Tin of the exposed inner wall of the pipeline at the valve inlet;obtaining a specific enthalpy hi of the water at the pipeline starting point based on the water temperature at the pipeline starting point; andAh $ h iobtaining an enthalpy difference “ ~ « of the leaked water of themass m at the pipeline starting point and the valve inlet based on the specific enthalpy h2 and the specific enthalpy hi;obtaining the temperature Tin of the exposed inner wall of the pipeline at the valve inlet based on QI and Q2 comprising:MO 0. B L - %~ ™------ letting 0¾ then obtaining J ;obtaining the pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline comprising:obtaining a heat flux density qi of insulation heat dissipation for a pipeline segment within each temperature zone, an insulation surface area Si for a pipeline segment within each temperature zone, and average heat dissipation power Qi for insulation of a pipeline segment within each temperature zone, whereinP represents an average density of water inside the pipeline, and a flow velocity mof water inside the pipeline is V, then ; the time required for the leaked waterL Lp-nr^of the mass m to flow through the pipeline of length L is t, then V m ; an internal leakage rate of the valve is set to be constant, then the time required for theleaked water of the mass m to flow through the pipeline segment in a different temperature zone is directly proportional to the length Xi of the pipeline segment, i.e., the time required to flow through the pipeline segment in the different temperaturet- S 't11 12 25zone is ' ® ;the pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline is equal to the sum of the heat loss incurred by the leaked water of the mass m flowing through the pipeline• ,.pp ,, AQ = >AQ. = >Qi -h ,segments in different temperature zones, based on ’, theabove-mentioned formulas Qi and ti are substituted to obtainf    - u.   Us;wherein, L represents the total length of the pipeline, Xi represents the proportion of the length of the pipeline segment within each different ambient temperature zone to the total length, r? represents the radius of an insulated outer surface of the pipeline, the average temperature of the insulated surface of the pipeline segment in each different ambient temperature zone is Twi, and the ambient temperature in different zones is Th; andobtaining the mass m of the leaked water from the valve per unit time based on the enthalpy difference AH and the heat dissipation amount AQ comprising:letting A H” A Q, then obtaining11 12 252. The method for estimating the leakage amount of a pipeline valve according to claim 1, characterized in that the specific enthalpy hi of the water at the starting point of the pipeline is determined based on the temperature and pressure of the water at the starting point of the pipeline; the specific enthalpy h2 of the water at the valve inlet is determined based on the temperature and pressure of the water at the valve inlet.

3. A device for estimating the leakage amount of a pipeline valve, configured to perform the method for estimating the leakage amount of a pipeline valve according to claim 1 or 2, characterized by comprising:a data acquisition module, configured to obtain an enthalpy difference AH of the leaked water of the mass m at a starting point of a pipeline and a valve inlet, and a pipeline heat dissipation amount AQ during the process of the leaked water of the mass m flowing through the entire length of the pipeline; anda data processing module, configured to calculate the mass of the leaked water from the valve per unit time based on the enthalpy difference AH and the pipeline heat dissipation amount AQ; whereinthe data acquisition module comprises a first acquisition unit, a second acquisition unit, a third acquisition unit and a fourth acquisition unit, and the data processing module comprises a first data processing unit, a second data processing unit and a third data processing unit;the first acquisition unit is configured to acquire thermal power QI conducted from an exposed inner wall of the pipeline at the valve inlet to an exposed outer wall of the pipeline and thermal power Q2 of convection heat dissipation between theexposed outer wall of the pipeline at the valve inlet and the ambient air, wherein¢ = 271.-(4432+005^-1^-(1,)-¾.the second acquisition unit is configured to acquire the temperature Tin of theexposed inner wall of the pipeline at the valve inlet, wherein................h-Tthe third acquisition unit is configured to acquire average heat dissipation power Qi11 12 25for insulation of a pipeline segment within each temperature zone, whereinthe fourth acquisition unit is configured to acquire the time ti required by the leaked water of the mass m from the valve per unit time to flow through the pipelinesegment in each different temperature zone, whereinthe first data processing unit obtains an enthalpy difference AH of the leakedwater of the mass m based on the specific enthalpy hi of the water at the pipelinestarting point and the specific enthalpy h2 of the water at the valve inlet; whereinthe second data processing unit obtains AQ based onwherein $the third data processing unit calculates the mass m of the leaked water from the valve per unit time based on the enthalpy difference AH and the heat dissipationamount AQ, wherein s = *;'si11 12 254. A valve, comprising a pipeline and a valve body, the valve body being arranged at one end of the pipeline, characterized by further comprising:a controller;a temperature sensor, configured to detect the outer surface temperature of the pipeline wall and the ambient temperature, and to transmit the detected outer surface temperature of the pipeline wall and the ambient temperature to the controller;a pressure sensor, configured to detect the water pressures at the starting point of the pipeline and at the valve body, and to transmit the detected pressures at the starting point of the pipeline and at the valve body to the controller; anda memory, configured to store one or more programs; whereinwhen the one or more programs are executed by the controller, the controller controls the valve to implement the method for estimating the leakage amount of a pipeline valve according to claim 1 or 2.

5. A storage medium having a computer program stored thereon, characterized in that when the program is executed by a controller, the valve implements the method for estimating the leakage amount of a pipeline valve according to claim 1 or 2.IntellectualPropertyOfficeApplication GB2505221.8Search report under Section 17 of the Patents Act 1977Date search completed: 31 July 2025Claims searched: 1-5International classificationSubclass and subgroup Valid from F16K37 / 00 01 / 01 / 2006 G01M3 / 00 01 / 01 / 2006 G01M3 / 28 01 / 01 / 2006Field of searchWorldwide search of patent documents classified in the following areas of the IPC:G01M, F16K, F17DDatabases used in the preparation of this search report:SEARCH-PATENTDocuments considered to be relevantPatent literatureCategory Relevant claims Document of relevance A - US 2004 / 0225458 A1 SHERIKAR, See figure 1, and paragraphs [0014] and [0023] in particular.Intellectual Property Office is an operating name of the Patent Office www.gov.uk / ipoCN 110375924 AUNIV HENAN POLYTECHNIC, See figure 2 in particular.Non-patent literatureCategory Relevant claims Document of relevanceCategoriesLetter or DescriptionsymbolX Document indicating lack of novelty or inventive step.Y Document indicating lack of inventive step, if combined with anotherdocument of the same category.& Member of the same patent family. A Document indicating technological background. P Document published on or after the priority date but before the fling date of the present application. E Earlier application published on or after the filing date of the present application.

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