CN118309836B - Pipeline valve leakage amount estimation method and device, valve and storage medium - Google Patents
Pipeline valve leakage amount estimation method and device, valve and storage medium Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
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Abstract
The present invention relates to the field of valve detection technologies, and in particular, to a method and apparatus for estimating leakage of a pipeline valve, a valve, and a storage medium. The method provided by the invention is based on the enthalpy difference of the valve leakage water at the pipeline starting point and the valve inletAnd based on heat preservation and heat dissipation capacity of pipelineThe relation with the valve leakage mass m obtains the mass m of the valve leakage water in unit time. Compared with the prior art, the method can calculate the mass m of the valve leakage water in unit time according to thermodynamic principles based on the temperature value of the relevant part, the inner radius and the outer radius of the pipeline and the like, has simple calculation process, does not need complex detection tools and professionals, and can provide reference for actual evaluation of engineering as a calculation result.
Description
Technical Field
The present invention relates to the field of pipeline detection technologies, and in particular, to a method and apparatus for estimating leakage of a pipeline valve, a valve, and a storage medium.
Background
One of the functions of the valve in the piping system is to block the flow of fluid. When the sealing surface of the valve is defective, the sealing of the valve may be poor, and the result is that the valve is in a closed state, but still fluid passes through, that is, the valve has internal leakage, which is abbreviated as internal leakage.
The leak rate in the valve is generally not large and is difficult to measure by conventional means. For valves with upstream and downstream temperature differences and larger pressure differences, the internal leakage rate of the valves can be gradually increased along with the time.
In the prior art, the detection of the leakage rate of the pipeline valve is realized by two methods for measuring the internal leakage rate. One is a valve internal leakage rate quantification technique based on acoustic emission signals, and a pressure difference exists between the upstream and downstream of the valve, so that the valve internal leakage can generate noise signals. The acoustic emission valve internal leakage rate detection is an internal leakage rate quantification technology for establishing association between a characteristic signal and a valve internal leakage rate based on experiments and deep learning and a neural network algorithm by detecting an acoustic signal of the valve internal leakage. The other is a valve internal leakage rate quantification technology based on infrared thermal imaging, and high-temperature fluid existing in a pipeline at the inlet of the valve leaks to a downstream pipeline, so that the temperature distribution of the downstream pipeline wall is changed, and the valve internal leakage rate quantification technology is reflected in infrared thermal imaging signals. The infrared thermal imaging valve internal leakage rate detection is a technology for establishing association between infrared signals and valve internal leakage rate based on experiments and deep learning and neural network algorithms by collecting pipeline infrared thermal imaging signals.
Although the method can accurately obtain the internal leakage rate of the valve, the detection time is long and the cost is high. And certain pipelines of the nuclear power plant are only used occasionally under specific working conditions of the unit, and most of the pipeline valves of the unit are in a closed state during running. Once the normally closed valve of the pipeline leaks, fluid upstream of the pipeline can be discharged to the downstream unexpectedly, the leakage amount in the valve is generally small, and the leakage amount cannot be accurately measured by methods such as an ultrasonic flowmeter. On the other hand, once the normally closed valve is found to leak in the engineering, there is generally no strong demand for accurate leak rate, and a quick and economical method is often required to estimate the leak rate of the valve.
Therefore, a method for estimating the leakage of the valve in the pipeline is needed to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a method and a device for estimating the leakage quantity of a pipeline valve, the valve and a storage medium, and the method and the device can be used for rapidly and economically estimating the internal leakage rate of the valve.
To achieve the purpose, the invention adopts the following technical scheme:
The method for estimating the leakage quantity of the pipeline valve comprises the following steps:
Setting the mass of the valve leakage water in unit time as m, and obtaining the enthalpy difference of the leakage water with the mass m at the starting point of the pipeline and the inlet of the valve And mass m of leakage water flow, and heat dissipation capacity of full-length process pipeline；
Based on enthalpy differenceAnd heat dissipation capacity of pipelineAnd calculating to obtain the mass m of the valve leakage water in unit time.
As a preferable technical scheme of the method for estimating the leakage amount of the pipeline valve, the enthalpy difference of the leakage water with the mass m at the pipeline starting point and the valve inlet is obtainedComprising:
Obtaining the heat power Q1 conducted from the exposed pipeline inner wall at the valve inlet to the pipeline outer wall and the heat power Q2 for heat dissipation by convection between the exposed pipeline outer wall per unit length at the valve inlet and the ambient air, wherein ，；
The temperature of the inner wall of the exposed pipeline at the inlet of the valve; The temperature of the outer wall of the exposed pipeline at the inlet of the valve; Is the metal heat conductivity of the pipe wall; 、 respectively the pipeline at the inlet of the valve the radius of the inner wall and the radius of the outer wall, Is ambient temperature;
Obtaining temperature of exposed pipeline inner wall at valve inlet based on Q1 and Q2 ；
Based on the temperature of the exposed pipeline inner wall at the inlet of the valveObtaining specific enthalpy of water at the inlet of the valve；
Obtaining specific enthalpy of water at a pipeline start point based on water temperature at the pipeline start point；
Based on specific enthalpy、Obtaining enthalpy difference of water leakage of mass m at pipeline starting point and valve inlet。
As a preferable technical scheme of the method for estimating the leakage amount of the pipeline valve, the temperature of the exposed pipeline inner wall at the inlet of the valve is obtained based on Q1 and Q2Comprising the following steps:
Let q1=q2, then 。
As a preferable technical scheme of the pipeline valve leakage amount estimation method, the heat dissipation capacity of the whole-length process pipeline of the leakage water flow pipeline with the mass m is obtainedQ comprises:
the heat flow density of heat preservation and heat dissipation of the pipe section in each temperature area is The heat preservation surface area of the pipe section in each temperature area isAverage heat dissipation power of heat preservation of pipe section of each temperature areaWherein
；；
；
Ρ is the average density of water in the pipeline, and the flow velocity v of water in the pipeline; The time required for the leakage water of mass m to flow through the pipeline of length L is t; Setting the constant internal leakage rate of the valve, the time required for the leakage water of the mass m to flow through the pipe sections in different temperature areas and the length of the pipe sectionsProportional, i.e. the time required to flow through each tube segment in a different temperature zone；
The leakage water of mass m flows through the full length process pipe to dissipate heatThe sum of the heat lost by the leakage water of mass m through the various different temperature pipe sections is based onCarry in the above、The formula is obtained；
Wherein L is the total length of the pipeline,For each different ambient temperature region the length of the tube segment is proportional to the total length,For the radius of the heat-insulating outer surface of the pipeline, the average temperature of the heat-insulating surface of each pipeline section in different environment temperature areas isThe ambient temperature of the different areas is。
As a preferable technical scheme of the method for estimating the leakage amount of the pipeline valve, the method is based on enthalpy differenceAnd heat dissipation capacityCalculating the mass m of the valve leakage water in unit time comprises the following steps:
Order the Then。
As a preferable technical scheme of the above-mentioned method for estimating the leakage amount of the pipe valve, the specific enthalpy of the water at the pipe start point is determined based on the temperature of the water at the pipe start point and the pressure of the water at the pipe start point; Determining specific enthalpy of water at the valve inlet based on temperature of water at the valve inlet and pressure of water at the valve inlet。
The invention also provides a device for estimating the leakage amount of the pipeline valve, which is used for executing the method for estimating the leakage amount of the pipeline valve according to any scheme, and comprises the following steps:
The data acquisition module acquires enthalpy difference of the leakage water of the mass m at the pipeline starting point and the valve inlet And mass m of leakage water flow, and heat dissipation capacity of full-length process pipeline；
Data processing module based on enthalpy differenceAnd heat dissipation capacity of pipelineAnd calculating to obtain the mass m of the valve leakage water in unit time.
As a preferable technical scheme of the above-mentioned pipe valve leakage estimating device, 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 obtaining unit is used for obtaining the thermal power Q1 conducted from the inner wall to the outer wall of the exposed pipeline at the valve inlet and the thermal power Q2 for convective heat dissipation between the outer wall of the exposed pipeline at the valve inlet and the ambient air, wherein ，；
The second acquisition unit is used for acquiring the temperature of the inner wall of the exposed pipeline at the inlet of the valveWherein；
The third acquisition unit is used for acquiring the average heat dissipation power of pipe section heat preservation in different temperature areasWherein:；
the fourth acquisition unit is used for acquiring the time required by water with the mass m of valve leakage water flowing through the pipe sections of each different temperature zone in unit time Wherein；
The first data processing unit is based on the specific enthalpy of the water at the beginning of the pipelineSpecific enthalpy of water at the valve inletObtaining enthalpy difference of water leakage of mass mWherein；
The second data processing unit is based onObtainingWherein；
The third data processing unit is based on enthalpy differenceAnd heat dissipation capacityCalculating the mass m of the valve leakage water in unit time, wherein。
The invention also provides a valve, which comprises a pipeline and a valve main body, wherein the valve main body is arranged at one end of the pipeline, and the valve further comprises:
a controller;
The temperature sensor is used for detecting the temperature of the outer surface of the pipe wall of the pipe and the ambient temperature and sending the detected temperature of the outer surface of the pipe wall of the pipe and the detected ambient temperature to the controller;
the pressure sensor is used for detecting the starting point of the pipeline and the water pressure at the valve main body and sending the detected starting point of the pipeline and the detected water pressure at the valve main body to the controller;
A memory for storing one or more programs;
When the one or more programs are executed by the controller, the controller controls the valve to implement the method for estimating a leakage amount of the pipeline valve according to any one of the above schemes.
A storage medium having stored thereon a computer program which when executed by a controller, causes the valve to implement a method of estimating a leakage of a conduit valve according to any one of the above-described aspects.
The invention has at least the following beneficial effects:
In the embodiment of the invention, the mass m of the valve leakage water in unit time and the enthalpy difference of the leakage water at the starting point of the pipeline and the inlet of the valve are used Based on the relation between the heat insulation and the heat dissipation capacity of the pipelineAnd obtaining the mass m of the valve leakage water in unit time according to the relation between the mass m of the valve leakage water in unit time and the mass m of the valve leakage water in unit time, wherein m is the internal leakage rate of the valve. Compared with the prior art, the method can calculate the valve leakage water quality m based on the thermodynamic principle based on the temperature value of the relevant part, the inner radius and the outer radius of the pipeline and the like, has simple calculation process, does not need complex detection tools and professionals, and can provide reference for engineering actual evaluation as a calculation result.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a flow chart of a method for estimating leakage of a pipeline valve according to the present invention;
FIG. 2 is a schematic block diagram of the position of a pipeline valve provided by the invention;
FIG. 3 is a block diagram of a device for estimating leakage of a pipeline valve according to the present invention;
Fig. 4 is a block diagram of a valve provided by the present invention.
In the figure:
201. a controller; 202. a temperature sensor; 203. a pressure sensor; 204. a memory;
301. a data acquisition module; 302. and a data processing module.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The embodiment of the invention provides a method for estimating the leakage quantity of a pipeline valve, which can estimate the internal leakage rate of the valve according to the temperature obtained by a sensor. Compared with the prior art, the method has the advantages of simple steps and low estimation cost.
As shown in fig. 1, the method for estimating the leakage amount of the pipeline valve comprises the following steps:
s101, setting the mass of the valve leakage water in unit time as m, and obtaining the enthalpy difference of the leakage water with the mass m at the starting point of the pipeline and the inlet of the valve And mass m of leakage water flow, and heat dissipation capacity of full-length process pipeline；
It should be noted that the enthalpy differenceThe specific enthalpy data in the physical property table of the water can be inquired according to the temperature and the pressure of the water at the starting point of the pipeline and the inlet of the valve. m is the mass of water leakage 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 a power plant monitoring system, and the temperature of the water in the pipeline at the valve inlet B can be calculated and obtained according to the outer wall temperature, the ambient temperature and the principle of heat transfer chemistry.
S102, based on enthalpy differenceAnd heat dissipation capacity of pipelineAnd calculating to obtain the mass m of the valve leakage water in unit time.
In the embodiment of the invention, the mass m of the valve leakage water in unit time and the enthalpy difference of the leakage water at the starting point of the pipeline and the inlet of the valve are usedBased on the relation between the heat insulation and the heat dissipation capacity of the pipelineThe relation with the mass m of the valve water leakage in unit time obtains the mass m of the valve water leakage in unit time. Compared with the prior art, the method can calculate the mass m of the valve leakage water in unit time based on the thermodynamic principle based on the temperature value of the relevant part, the inner radius and the outer radius of the pipeline and the like, has simple calculation process, does not need complex detection tools and professionals, and can provide reference for actual evaluation of engineering as a calculation result.
In particular, in some embodiments, an enthalpy difference of the leakage water of mass m is obtained at the pipe start a and the valve inlet BComprising the following steps:
Obtaining the heat power Q1 conducted from the exposed pipeline inner wall at the valve inlet B to the pipeline outer wall and the heat power Q2 for heat dissipation of the unit length exposed pipeline outer wall at the valve inlet and the ambient air convection, wherein, ，；
Is the position of the valve inlet B the temperature of the inner wall of the exposed pipeline; The temperature of the outer wall of the exposed pipeline at the inlet B of the valve is; Is the metal heat conductivity of the pipe wall; 、 respectively the pipeline at the inlet B of the valve the radius of the inner wall and the radius of the outer wall, Is ambient temperature;
Obtaining temperature of exposed pipeline inner wall at valve inlet based on Q1 and Q2 (I.e., the water temperature at the valve inlet), i.e., the water temperature at the valve inlet B;
based on the temperature of the exposed pipeline inner wall at the inlet of the valve Obtaining specific enthalpy of water at the beginning of a pipeObtaining specific enthalpy of water at a pipeline start point based on water temperature at the pipeline start point; The water temperature at the beginning of the pipeline is directly read from a power plant monitoring system or obtained by referring to a water temperature calculation method at the inlet of a valve.
Based on specific enthalpy、And mass m to obtain enthalpy difference。
In some embodiments, the bare pipe inner wall temperature at the valve inlet is obtained based on Q1 and Q2Comprising the following steps:
Let q1=q2, then 。
In an actual application scene, the pipeline starting point A is usually connected with a normally open process pipeline, and the temperature and the pressure of water at the pipeline starting point A can be directly obtained through inquiry of a monitoring system of a nuclear power plant. The temperature of the water in the pipeline at the inlet B of the internal leakage valve needs to be calculated. Dismantling the heat insulation layer of the pipeline at the valve inlet B, and measuring the temperature of the outer surface of the metal pipe wall of the pipeline at the valve inlet B after the temperature of the outer wall of the pipeline is stableAnd ambient temperature。
The calculation formula of Q1 is a typical round through wall heat conduction model formula and is a basic principle of heat transfer science; the heat exchange process of the outer surface of the pipe wall and the air belongs to the convection heat exchange.
The convection heat dissipation process of the metal pipeline and the air is complex and is influenced by a plurality of factors, and a general calculation formula does not exist. For the pipeline-air convection heat dissipation process, the heat power of the exposed pipeline at the valve inlet B and the heat dissipation of the ambient air convection can be determined by referring to the method given in GB/T17357-2008 method for measuring heat flow distribution and surface temperature method on site of equipment and pipeline heat loss on the surface of the heat insulation layer.
It can be considered that the temperature of the water in the pipeline at the valve inlet B and the temperature of the inner wall of the exposed pipeline at the valve inlet BThe same applies. Corresponding toThe water pressure at temperature may be determined with reference to the pressure at the beginning of the pipeline, it being understood that the water pressure is approximately the same throughout the slow flowing pipeline.
In some embodiments, the leakage water of mass m is obtained by removing heat from the full length process pipeThe method specifically comprises the following steps:
the heat flow density of heat preservation and heat dissipation of the pipe section in each temperature area is The heat preservation surface area of the pipe section in each temperature area isAverage heat dissipation power of heat preservation of pipe section of each temperature areaWherein:；；
。
ρ is the average density of water in the pipeline, and the flow velocity v of water in the pipeline ; The time required for the leakage water of mass m to flow through the pipeline of length L is t; Setting the constant internal leakage rate of the valve, the time required for the leakage water of the mass m to flow through the pipe sections in different temperature areas and the length of the pipe sectionsProportional, i.e. the time required to flow through each tube segment in a different temperature zone；
The leakage water of mass m flows through the full length process pipe to dissipate heatThe sum of the heat lost by the leakage water of mass m through the various different temperature pipe sections is based onCarry in the above、The formula is obtained；
Wherein L is the total length of the pipeline,For each different ambient temperature region the length of the tube segment is proportional to the total length,For the radius of the heat-insulating outer surface of the pipeline, the average temperature of the heat-insulating surface of each pipeline section in different environment temperature areas isThe ambient temperature of the different areas is。
In some embodiments, the specific enthalpy of the water at the pipe start is determined based on the temperature of the water at the pipe start and the pressure of the water at the pipe start; Determining specific enthalpy of water at the valve inlet based on temperature of water at the valve inlet and pressure of water at the valve inlet。
When the valve is not leaked, water in an upstream pipeline is in a non-flowing static state, and the water temperature tends to be consistent with the ambient temperature along with the extension of time; the valve is internally leaked, and upstream high-temperature water flows from a starting point to the valve direction, so that the temperature of water in a pipeline in front of the valve, metal on the wall of the pipeline and a heat preservation layer are increased. In the process, along with the gradual flow of the upstream high-temperature water to the valve direction, the heat of the high-temperature water can be continuously emitted to the outside air through the pipe wall and the heat preservation layer, and the water temperature is further reduced continuously. Obviously, the faster the valve leakage rate, the faster the high-temperature water at the starting point of the pipeline flows to the valve, and the less heat is emitted in the flowing process, so that the higher the water temperature at the inlet of the valve is, that is, the leakage rate of the valve has a quantitative relationship with the energy difference between the high-temperature water at the starting point of the pipeline and the inlet of the valve.
The energy difference is calculated and obtained by two methods: the method comprises obtaining temperature and pressure of water at pipeline starting point and valve inlet, inquiring physical property table of water to obtain specific enthalpy value at two positions, and further obtaining enthalpy difference of valve leakage mass flow m water. The water temperature in the two-position pipeline can be directly read by a nuclear power plant monitoring system, and can also be obtained by thermodynamic calculation. The second method is to calculate the total heat emitted by the process of the upstream high-temperature water flowing through the whole length of the pipeline. For a pipeline passing through a plurality of different temperature ranges, the total heat dissipation capacity of the process that the high temperature water flows through the whole length of the pipelineEqual to the heat dissipation capacity of the pipe section flowing through each different temperature intervalAnd (3) summing.
Obviously, the energy differences obtained by the two methods are equal in value, i.eThe mass m of the valve leakage water in unit time can be obtained by solving the method,。
For example, table 1 shows the valve internal leakage rate calculation parameters, as shown in fig. 2, the pipeline passes through 3 different floors/environmental temperature areas, and q1=q2 is calculated according to the heat balance principle, and the temperature of the exposed pipeline inner wall at the valve inlet B is obtained by substituting the calculated data in table 1190 C, i.e. the water temperature at the valve inlet B is also 190 c.
As shown in fig. 2, according to the parameters of water at the pipeline starting point a and the valve inlet B, querying the physical property table of water to obtain specific enthalpy values of A, B at two positions, and obtaining enthalpy difference of water at the two positions of about 165.8 KJ/Kg, wherein the enthalpy difference of the valve leakage water in unit time is:
。
Mass m of valve leakage water in unit time flows through heat dissipation capacity of process pipeline in whole length of pipeline Equal to the heat dissipation capacity of the pipe section flowing through each section of different temperature areasThe sum of the two values,。
Heat dissipation capacity of pipe section of each section of different temperature regionEqual to the heat preservation and heat dissipation power of the sectionProduct of flow time t i:。
The mass m of the valve leakage water in unit time is required to flow through each section of the different temperature zone pipe section Proportional to the length of the section of pipe in this region, equal to:。
the meanings of the parameters in the formula are shown in table 1.
Thermal insulation heat dissipation power of pipe sections in different temperature areas of each sectionThe method is calculated according to GB/T17357-2008 method of equipment and pipeline heat insulation layer surface heat loss on-site measurement heat flow metering and surface temperature method.
Considering that the pipeline between the starting point A of the water supply long circulation pipeline and the leakage valve spans 3 floors/temperature areas, the temperature of the heat insulation outer surfaces of the pipelines of different floors, the temperature of the ambient air and the lengths of the pipelines arranged are all obviously different, in order to reduce the calculation error of the heat insulation and dissipation capacity of the pipelines, the method of calculating the heat insulation and dissipation capacity of the pipeline sections of different temperature areas according to floor segmentation and finally summing up to calculate the total heat dissipation loss is adopted, namely:。
the above formula is integrated and can be obtained:
。
Wherein the subscripts i=1, 2,3 denote 3 floors (temperature zones) respectively, Indicates the temperature of the heat-preserving outer surface of the corresponding floor (temperature zone),Representing the ambient temperature of the corresponding floor (temperature zone) (i.e. the ambient temperature of the different zones), x i represents the ratio of the length of the pipe to the total length of the pipe for the corresponding floor (temperature zone). The values of the parameters in the formula are shown in table 1.
Substituting the parameter values in table 1 yields:。
Order the The mass of the internal leakage of the regulating valve is about 6.19 Kg/s.
Table 1 valve leak rate calculation parameters
Compared with the existing valve leakage rate quantifying method, the embodiment provided by the invention has the following advantages:
1. The applicability is wide: the basic thermodynamic principle is applied, so that the valve internal leakage problem of all high-temperature fluid pipelines is applicable.
2. Simple, quick and easy to operate: the calculation method has simple input parameters and easy acquisition, and does not need complex detection equipment and software simulation.
3. The cost is low: ordinary engineers can master the system through training without outsourcing professional technical team implementation.
The embodiment of the invention further provides a device for estimating the leakage amount of a pipeline valve, which is used for executing the method for estimating the leakage amount of the pipeline valve provided by the embodiment of the invention, as shown in fig. 3, the device for estimating the leakage amount of the pipeline valve comprises a data acquisition module 301 and a data processing module 302:
The data acquisition module 301 is used for obtaining the enthalpy difference of the leakage water of the mass m at the pipeline starting point and the valve inlet And mass m of leakage water flow is used for dissipating heat through the whole length of the process pipeline；
The data processing module 302 is configured to be based on enthalpy differenceAnd heat dissipation capacity of pipelineCalculating the mass m of the valve leakage water in unit time, wherein，Is the specific enthalpy of water at the beginning of the pipe,Is the specific enthalpy of water at the inlet of the valve, L is the total length of the pipeline,For each different ambient temperature region the length of the tube segment is proportional to the total length,For the radius of the heat-insulating outer surface of the pipeline, the average temperature of the heat-insulating surface of each pipeline section in different environment temperature areas isThe ambient temperature is，The length of the tube segment is a proportion of the total length for each different ambient temperature region.
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, where:
The first obtaining unit is used for obtaining the thermal power Q1 conducted from the exposed pipeline at the upstream of the valve to the outer wall of the pipeline and the thermal power Q2 for heat dissipation of the exposed pipeline at the upstream of the valve in a unit length manner through convection with ambient air, wherein ，；
The second acquisition unit is used for acquiring the temperature of the inner wall of the exposed pipeline at the inlet of the valveWherein；
The third acquisition unit is used for acquiring the thermal power of pipe section insulation in different temperature areasWherein:；
the fourth acquisition unit is used for acquiring the time required by water with the mass m of valve leakage water flowing through the pipe sections of each different temperature zone in unit time Wherein；
The first data processing unit obtains enthalpy difference based on specific enthalpy h 1 of water at the starting point of the pipeline and specific enthalpy h 2 of water at the inlet of the valveWherein；
The second data processing unit is based onObtainingWherein；
The third data processing unit is based on enthalpy differenceAnd heat dissipation capacityCalculating the mass m of the valve leakage water in unit time, wherein。
In the device for estimating the leakage amount of the pipeline valve provided in this embodiment, the data acquisition module 301 obtains the enthalpy difference of the leakage water of the mass m at the pipeline starting point and the valve inletAnd heat dissipation capacity through the piping process; Enthalpy difference based by the data processing module 302And heat dissipation capacity of pipeline And calculating to obtain the mass m of the valve leakage water in unit time. The pipeline valve leakage quantity estimation device can calculate the mass m of the valve leakage water in unit time, namely the internal leakage rate of the valve based on the temperature value of the relevant part and the pipeline diameter in combination with the thermodynamic principle, the calculation process is simple, complex detection tools and professionals are not needed, and the calculation result can provide reference for engineering actual evaluation.
Fig. 4 is a block diagram of a valve according to an embodiment of the present invention, and as shown in fig. 4, the embodiment of the present invention provides a valve, which includes a pipe and a valve body, wherein the valve body is disposed at one end of the pipe, and 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 a pipe wall outer surface temperature and an environmental temperature of the pipe, and send the detected pipe wall outer surface temperature and the detected environmental temperature to the controller 201; the pressure sensor 203 is configured to detect a start point of a pipe and a water pressure at the valve main body, and send the detected start point of the pipe and the water pressure at the valve main body to the controller 201; memory 204 is used to store one or more programs; when one or more programs are executed by the controller, the controller 201 is caused to control the valve to implement the method for estimating the leakage amount of the pipeline valve according to the embodiment of the present invention.
The memory 204 is a computer readable storage medium that can be used to store software programs, computer executable programs, and modules, such as program instructions/modules corresponding to the pipeline valve leakage amount estimation method in the embodiment of the present invention. The controller 201 executes various functional applications of the valve and data processing by running software programs, instructions and modules stored in the memory 204, i.e., implements the pipe valve leakage amount estimation method of the above-described embodiment.
The memory 204 mainly includes a storage program area and a storage data area, wherein the storage program area can store an operating system, at least one application program required by functions; the storage data area may store data created according to the use of the terminal, etc. In addition, memory 204 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, the memory 204 may further include memory 204 remotely located with respect to the controller 201, which may be connected to the valve via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, 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 the pipeline valve provided by the above embodiment, and technical details which are not described in detail in the present embodiment can be seen in the above embodiment, and the present embodiment has the same beneficial effects of executing the method for estimating the leakage amount of the pipeline valve.
The embodiment of the invention also provides a storage medium, on which a computer program is stored, which when executed by a controller, implements the method for estimating the leakage amount of the pipeline valve according to the above embodiment of the invention.
Of course, the storage medium containing the computer executable instructions provided by the embodiment of the invention is not limited to the operations in the method for estimating the leakage amount of the pipeline valve, but can also execute the related operations in the method for estimating the leakage amount of the pipeline valve provided by the embodiment of the invention, and has corresponding functions and beneficial effects.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., and include several instructions for causing a computer device (which may be a robot, a personal computer, a server, or a network device, etc.) to execute the pipe valve leakage estimation method according to the embodiments of the present invention.
Furthermore, the foregoing description of the preferred embodiments and the principles of the invention is provided herein. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (5)
1. The method for estimating the leakage quantity of the pipeline valve is characterized by comprising the following steps of:
the quality of the valve leakage water in unit time is set as Obtaining the qualityEnthalpy difference of leakage water at pipeline starting point and valve inletAnd mass ofIs used for dissipating heat through the whole length of the process pipeline；
Obtaining enthalpy difference of water leakage of mass m at pipeline starting point and valve inletComprising:
obtaining the exposed inner wall of the pipeline at the inlet of the valve thermal power conducted to the outer wall of the pipe And the unit length of exposed pipeline outer wall at the valve inlet and the thermal power of the convective heat dissipation of the ambient airWherein，
；
The temperature of the inner wall of the exposed pipeline at the inlet of the valve; The temperature of the outer wall of the exposed pipeline at the inlet of the valve; Is the metal heat conductivity of the pipe wall; 、 respectively the pipeline at the inlet of the valve the radius of the inner wall and the radius of the outer wall, Is ambient temperature;
Based on AndObtaining the temperature of the exposed pipeline inner wall at the inlet of the valve；
Based on the temperature of the exposed pipeline inner wall at the inlet of the valveObtaining specific enthalpy of water at the inlet of the valve；
Obtaining specific enthalpy of water at a pipeline start point based on water temperature at the pipeline start point；
Based on specific enthalpy、Obtaining qualityEnthalpy difference of leakage water at pipeline starting point and valve inlet；
Based onAndObtaining the temperature of the exposed pipeline inner wall at the inlet of the valveComprising the following steps:
Order the Then；
Obtaining qualityIs used for dissipating heat through the whole length of the process pipelineComprising the following steps:
the heat flow density of heat preservation and heat dissipation of the pipe section in each temperature area is The heat preservation surface area of the pipe section in each temperature area isAverage heat dissipation power of heat preservation of pipe section of each temperature areaWherein
；；
；
The flow rate of water in the pipeline is the average density of water in the pipelineThen; Quality ofLeakage water flow length of (2)The time required for the pipeline of (2) isThen; The internal leakage rate of the valve is set to be constant, quality is thenThe time required for the leakage water of the (E) pipeline to flow through the pipeline sections in different temperature areas and the length of the pipeline sectionsProportional, i.e. the time required to flow through each tube segment in a different temperature zone；
Quality ofIs used for dissipating heat through the whole length of the process pipelineEqual to massThe sum of the heat lost by the leakage water flowing through the various different temperature pipe sections is based onCarry in the above、The formula is obtained；
Wherein,For the total length of the pipe,For each different ambient temperature region the length of the tube segment is proportional to the total length,For the radius of the heat-insulating outer surface of the pipeline, the average temperature of the heat-insulating surface of each pipeline section in different environment temperature areas isThe ambient temperature of the different areas is；
Based on enthalpy differenceAnd heat dissipation capacityCalculating to obtain the mass m of the valve leakage water in unit time, wherein the mass m comprises the following steps:
Order the Then。
2. The method of estimating a leakage amount of a pipe valve according to claim 1, wherein the specific enthalpy of the water at the pipe start point is determined based on a temperature of the water at the pipe start point and a pressure of the water at the pipe start point; Determining specific enthalpy of water at the valve inlet based on temperature of water at the valve inlet and pressure of water at the valve inlet。
3. A pipe valve leakage amount estimation apparatus for performing the pipe valve leakage amount estimation method according to claim 1 or 2, comprising:
Data acquisition module for obtaining quality Enthalpy difference of leakage water at pipeline starting point and valve inletAnd mass ofIs used for dissipating heat through the whole length of the process pipeline；
Data processing module based on enthalpy differenceAnd heat dissipation capacity of pipelineCalculating to obtain the quality of the valve leakage water in unit time；
The 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 used for acquiring the thermal power conducted from the inner wall to the outer wall of the exposed pipeline at the inlet of the valve And the heat power of the exposed pipeline outer wall at the valve inlet and the convection heat radiation of the ambient airWherein，；
The second acquisition unit is used for acquiring the temperature of the inner wall of the exposed pipeline at the inlet of the valveWherein；
The third acquisition unit is used for acquiring the average heat dissipation power of pipe section heat preservation in different temperature areasWherein:；
the fourth acquisition unit is used for acquiring the quality of the valve leakage water in unit time The time required for water to flow through each segment of the different temperature zonesWherein；
The first data processing unit is based on the specific enthalpy of the water at the beginning of the pipelineSpecific enthalpy of water at the valve inletObtaining qualityEnthalpy difference of leakage water of (2)Wherein；
The second data processing unit is based onObtainingWherein；
The third data processing unit is based on enthalpy differenceAnd heat dissipation capacityCalculating to obtain the quality of the valve leakage water in unit timeWherein。
4. The valve, including pipeline and valve main part, the valve main part set up in the one end of pipeline, characterized by still includes:
a controller;
The temperature sensor is used for detecting the temperature of the outer surface of the pipe wall of the pipe and the ambient temperature and sending the detected temperature of the outer surface of the pipe wall of the pipe and the detected ambient temperature to the controller;
The pressure sensor is used for detecting the starting point of the pipeline and the water pressure at the valve main body and sending the detected starting point of the pipeline and the detected water pressure at the valve main body to the controller;
A memory for storing one or more programs;
The one or more programs, when executed by the controller, cause the controller to control a valve to implement the conduit valve leakage estimation method of claim 1 or 2.
5. A storage medium having stored thereon a computer program, characterized in that the valve, when executed by a controller, implements the method for estimating a leakage amount of a pipe valve according to claim 1 or 2.
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| CN113028299B (en) * | 2021-03-03 | 2022-04-29 | 西北工业大学 | A gas-liquid equivalent detection method and system for micro-leakage of aviation hydraulic pipeline |
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