CN112649460B - Thermal stratification test method for surge tube of voltage stabilizer - Google Patents
Thermal stratification test method for surge tube of voltage stabilizer Download PDFInfo
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- CN112649460B CN112649460B CN201910957022.XA CN201910957022A CN112649460B CN 112649460 B CN112649460 B CN 112649460B CN 201910957022 A CN201910957022 A CN 201910957022A CN 112649460 B CN112649460 B CN 112649460B
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- 239000003381 stabilizer Substances 0.000 title claims abstract description 92
- 238000013517 stratification Methods 0.000 title claims abstract description 39
- 238000010998 test method Methods 0.000 title claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims abstract description 89
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000013461 design Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000012360 testing method Methods 0.000 claims description 18
- 230000000630 rising effect Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 description 5
- 230000008646 thermal stress Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a thermal stratification test method of a surge tube of a voltage stabilizer, which comprises the following steps: a temperature sensor group and a displacement sensor group are respectively arranged on a surge tube of the voltage stabilizer to be tested; monitoring temperature data and displacement data of the fluctuation tube of the voltage stabilizer by using a temperature sensor group and a displacement sensor group, and calculating temperature difference data according to the temperature data; judging whether the temperature difference data and the displacement data meet the preset parameter requirements, constructing a fluid analysis model of the fluctuation tube of the voltage stabilizer to be tested based on a temperature parameter data set in the temperature data, and intercepting cross sections of the fluid analysis model at positions of each temperature sensor group under different working conditions as temperature detection surfaces so as to verify the thermal layering effect of the fluctuation tube. According to the invention, the real-time monitoring related data of the thermal stratification of the surge tube of the voltage stabilizer to be tested is obtained through the real-time monitoring of the thermal stratification temperature of the surge tube, so that whether the surge tube of the voltage stabilizer to be tested meets the fatigue design requirement is judged.
Description
Technical Field
The invention relates to the technical field of debugging of nuclear primary equipment of a nuclear power station, in particular to a thermal stratification test method of a surge tube of a voltage stabilizer.
Background
In the technical field of nuclear power, a surge tube (surge tube for short) of the voltage stabilizer is used for connecting the voltage stabilizer with a hot section of a main coolant pipeline, is a main transmission channel for controlling the pressure of a main system by the voltage stabilizer, and belongs to one of important nuclear safety primary pipelines of a nuclear power station.
Because the temperature of the coolant in the voltage stabilizer is high, the density is low, and the upper part of the section of the fluctuation pipe is occupied; the coolant in the main pipeline has low temperature and high density, occupies the lower part of the section of the surge tube, and is called as surge tube thermal stratification of the voltage stabilizer in engineering. Thermal stratification within the surge tube causes the tube wall temperature to delaminate, thereby creating gross bending thermal stresses and localized thermal stresses in the surge tube cross-section, creating unintended displacement and supporting loads. This phenomenon may pose a threat to the integrity of the surge tube, creating a safety hazard for the normal operation of the nuclear power plant.
The voltage regulator fluctuation tube needs to be subjected to strict test before being put into use in a nuclear power plant, so that a more perfect voltage regulator fluctuation tube thermal stratification test method is needed, but no more standard voltage regulator fluctuation tube thermal stratification test method exists in the existing market.
Disclosure of Invention
The invention aims to solve the technical problem that a relatively perfect thermal layering test method for the surge tube of the voltage regulator is not available at the present stage, and equipment damage caused by the thermal layering of the surge tube can occur if the surge tube of the voltage regulator is directly put into use.
In order to solve the technical problems, the invention provides a thermal stratification test method of a surge tube of a voltage stabilizer, which comprises the following steps:
respectively installing a temperature sensor group at a first type preset position of the to-be-tested voltage stabilizer fluctuation tube, and installing a displacement sensor group at a second type preset position of the to-be-tested voltage stabilizer fluctuation tube;
all the temperature sensor groups and the displacement sensor groups measure temperature data of a first type preset position and displacement data of a second type preset position of the fluctuation tube of the voltage stabilizer to be tested under a preset condition according to a preset measurement mode, and temperature difference data are calculated according to the temperature data;
judging whether the temperature difference data and the displacement data meet preset parameter requirements, if so, constructing a fluid analysis model of the to-be-tested voltage stabilizer fluctuation tube based on a temperature parameter data set in the temperature data, otherwise, judging that the thermal stratification test of the to-be-tested voltage stabilizer fluctuation tube fails;
intercepting cross sections of positions of all temperature sensor groups when the fluid analysis model is under different interception conditions as temperature detection surfaces, comparing whether data measured by all temperature sensor groups under different interception conditions are all in a preset error range or not based on the temperature detection surfaces, if so, judging that the thermal stratification test of the to-be-tested voltage stabilizer is successful, and if not, judging that the thermal stratification test of the to-be-tested voltage stabilizer fails, and if not, judging that the thermal stratification test of the to-be-tested voltage stabilizer does not meet the fatigue design requirement, wherein all interception conditions are contained in the preset conditions.
Preferably, the preset condition includes:
the main loop of the nuclear power plant connected with the fluctuation pipe of the voltage stabilizer to be tested is in a heating stage; and
the main loop of the nuclear power plant connected with the fluctuation pipe of the voltage stabilizer to be tested is in a cooling stage,
the temperature rising stage comprises a stage that the temperature of the main loop of the nuclear power plant is sequentially raised to each temperature rising point in a preset temperature rising data set;
the cooling stage comprises a stage that the temperature of the voltage stabilizer is sequentially reduced to each cooling point in a preset cooling data set.
Preferably, the temperature increase points in the preset temperature increase data set include 250°f, 350°f, and 450°f, and the temperature decrease points in the preset temperature decrease data set include 450°f and 350°f.
Preferably, the preset measurement mode includes:
when the temperature change value of any one temperature sensor in all the temperature sensor groups is larger than a temperature change threshold value by 2 degrees or the temperature difference value of the top temperature sensor and the bottom temperature sensor set in any one temperature sensor group is larger than a temperature difference threshold value by 2 degrees F, recording data of all the temperature sensor groups and the displacement sensor groups once;
when the change of the displacement value of any one of the displacement sensor groups is larger than the displacement change threshold value by 0.1inch, recording data of all the temperature sensor groups and the displacement sensor groups once;
after the temperature of the main loop of the nuclear power plant is sequentially increased to each heating point in a preset heating data set or is reduced to each cooling point in a preset cooling data set, the main loop of the nuclear power plant pauses heating or cooling for a preset time period, and after the main loop of the nuclear power plant finishes pausing for the preset time period, all the temperature sensor sets and the displacement sensor sets perform data recording once;
and when all the temperature sensor groups and the displacement sensor groups do not record data in a preset intermittent time period, recording data once by all the temperature sensor groups and the displacement sensor groups of the to-be-tested voltage stabilizer fluctuation tube.
Preferably, the temperature change threshold and the temperature difference threshold may be extended to + -10 deg.f and the displacement change threshold may be extended to + -0.5 inch in the case of the stabilizer to be tested surge tube in power plant mode 6 operation.
Preferably, the condition that all the temperature sensor groups and the displacement sensor groups perform one-time data recording after the main loop of the nuclear power plant finishes suspending for a preset period of time is set as the interception condition.
Preferably, data obtained by performing data recording on all the temperature sensor groups once is used as one group of temperature sub-data, and the temperature data comprises a plurality of groups of temperature sub-data;
calculating temperature difference data from the temperature data includes:
the data recorded by two adjacent temperature sensors in each temperature sensor group in each temperature sub-data group are subjected to difference making to obtain an adjacent sensor temperature difference data group;
and making differences between the data recorded by the same temperature sensors of two adjacent heating points in the preset heating data set, and making differences between the data recorded by the same temperature sensors of two adjacent cooling points in the preset cooling data set to obtain an adjacent temperature point temperature difference data set.
Preferably, determining whether the temperature difference data and the displacement data both meet a preset parameter requirement includes:
judging whether the adjacent sensor temperature difference data in the adjacent sensor temperature difference data set are smaller than a preset adjacent sensor temperature difference threshold value, if yes, judging the adjacent temperature point temperature difference data set, otherwise, judging that the temperature difference data do not meet preset parameter requirements;
judging whether the adjacent temperature point temperature difference data in the adjacent temperature point temperature difference data set are smaller than a preset Xiang Wen point temperature difference threshold value, if yes, judging that the temperature difference data meet preset parameter requirements, otherwise, judging that the temperature difference data do not meet the preset parameter requirements;
judging whether the displacement data is smaller than a preset displacement threshold value, if yes, judging that the displacement data meets the preset parameter requirement, otherwise, judging that the displacement data does not meet the preset parameter requirement.
Preferably, data obtained by performing data recording on all the temperature sensor groups once is used as one group of temperature sub-data, and the temperature data comprises a plurality of groups of temperature sub-data;
the first type of preset positions comprise the head end and the tail end of the surge tube of the voltage stabilizer to be tested,
the temperature parameter data set in the temperature data is a set formed by temperature parameter data measured by temperature sensor groups arranged at the head end and the tail end of the fluctuation tube of the voltage stabilizer to be tested in each group of temperature sub data.
Preferably, the fluid analysis model is built using ANSYS' computational fluid dynamics CFD software.
One or more embodiments of the above-described solution may have the following advantages or benefits compared to the prior art:
by applying the thermal layering test method for the voltage regulator fluctuation tube, provided by the embodiment of the invention, the qualification of the voltage regulator fluctuation tube to be tested is primarily judged by arranging the temperature sensor group and the displacement sensor group at a plurality of positions of the voltage regulator fluctuation tube and comparing the temperature data and the displacement data of the voltage regulator fluctuation tube detected by the temperature sensor group and the displacement sensor group under different conditions with the preset threshold value of the voltage regulator fluctuation tube; and then, constructing a fluid analysis model of the to-be-tested voltage stabilizer fluctuation tube based on a temperature parameter data set in the temperature data, intercepting temperature detection surfaces under different interception conditions, comparing data measured by a temperature sensor under the interception conditions with corresponding parameter data on the temperature detection surfaces, and further judging that the to-be-tested voltage stabilizer fluctuation tube is successful in thermal stratification test, wherein the to-be-tested voltage stabilizer fluctuation tube meets the fatigue design requirement. The real-time monitoring of the thermal stratification temperature of the to-be-tested voltage stabilizer is carried out, so that real-time monitoring related data of the thermal stratification of the to-be-tested voltage stabilizer is obtained, and further, the success of the thermal stratification test of the to-be-tested voltage stabilizer is judged, and the to-be-tested voltage stabilizer does not meet the fatigue design requirement.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention, without limitation to the invention. In the drawings:
FIG. 1 is a schematic flow chart of a thermal stratification test method of a surge tube of a voltage regulator according to an embodiment of the present invention;
fig. 2 shows an arrangement of a temperature sensor group and a displacement sensor group on a surge tube of a voltage regulator to be tested in a surge tube thermal stratification test method of a voltage regulator according to an embodiment of the present invention.
Detailed Description
The following will describe embodiments of the present invention in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present invention, and realizing the technical effects can be fully understood and implemented accordingly. It should be noted that, as long as no conflict is formed, each embodiment of the present invention and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
Because the temperature of the coolant in the voltage stabilizer is high, the density is low, and the upper part of the section of the fluctuation pipe is occupied; the coolant in the main pipeline has low temperature and high density, occupies the lower part of the section of the surge tube, and is called as surge tube thermal stratification of the voltage stabilizer in engineering. Thermal stratification within the surge tube causes the tube wall temperature to delaminate, thereby creating gross bending thermal stresses and localized thermal stresses in the surge tube cross-section, creating unintended displacement and supporting loads. This phenomenon may pose a threat to the integrity of the surge tube, creating a safety hazard for the normal operation of the nuclear power plant.
The voltage regulator fluctuation tube needs to be subjected to strict test before being put into use in a nuclear power plant, so that a more perfect voltage regulator fluctuation tube thermal stratification test method is needed, but no more standard voltage regulator fluctuation tube thermal stratification test method exists in the existing market.
Example 1
In order to solve the technical problems in the prior art, the embodiment of the invention provides a thermal stratification test method for a surge tube of a voltage regulator.
FIG. 1 is a schematic flow chart of a thermal stratification test method of a surge tube of a voltage regulator according to an embodiment of the present invention; referring to fig. 1, the method for testing the thermal stratification of the surge tube of the voltage regulator according to the embodiment of the invention comprises the following steps.
Step S101, respectively setting a temperature sensor group at a first type preset position of a surge tube of the voltage stabilizer to be tested, and setting a displacement sensor group at a second type preset position of the surge tube of the voltage stabilizer to be tested.
Specifically, the surge tube of the voltage stabilizer to be tested is installed between the voltage stabilizer and the reactor main loop, so that the surge tube thermal stratification test of the surge tube of the voltage stabilizer to be tested is realized during the thermal test of the power plant. Specifically, temperature sensor groups are respectively arranged at first type preset positions of the to-be-tested voltage stabilizer fluctuation tube, and displacement sensor groups are arranged at second type preset positions of the to-be-tested voltage stabilizer fluctuation tube. Fig. 2 shows an arrangement of a temperature sensor group and a displacement sensor group on a surge tube of a voltage regulator to be tested in a surge tube detection method of a voltage regulator according to an embodiment of the present invention. Referring to fig. 2, preferably, the first type preset position is set at the head end, the tail end, the corner and other 10 positions of the surge tube of the voltage stabilizer to be tested (the first type preset position may be set with reference to fig. 2), and the temperature sensor group T1 to the temperature sensor group T10 are sequentially set at the first type preset position. Each temperature sensor group comprises five temperature sensors which are uniformly and annularly arranged on a half of fluctuation tube of the voltage stabilizer to be tested. It should be noted that each group of temperature sensor groups includes a pair of temperature sensors installed on the surge tube of the voltage stabilizer to be tested, one of which is set as the top sensor and the other as the bottom sensor. The temperature sensor has a temperature detection range of 70 DEG F to 700 DEG F with an accuracy of + -1 DEG F. Meanwhile, preferably, the key positions of the 8 positions of the surge tube of the voltage stabilizer to be tested are selected as the second type preset positions (the second type preset positions can be set with reference to fig. 2), and the displacement sensor group D1 to the displacement sensor group D8 are sequentially set at the second type preset positions. Wherein the displacement measurements are taken in both the horizontal and vertical directions at each of the above-described locations, perpendicular to the pipe axis, to ensure that the displacement measurements are provided at different axial locations of the surge line of the voltage regulator to be tested. The displacement range of the selected displacement sensor is +/-5 inch (+ -127 mm), and the accuracy is +/-0.1 inch (+ -2.54 mm).
It should be noted that the number of temperature sensors included in the temperature sensor group may be other reasonable values.
Step S102, all temperature sensor groups and displacement sensor groups measure temperature data of a first type preset position and displacement data of a second type preset position of the fluctuation tube of the voltage stabilizer to be tested under preset conditions according to a preset measurement mode, and temperature difference data are calculated according to the temperature data.
Specifically, before measurement, each installed temperature sensor group and displacement sensor group are ensured to be normally used and the installation position is recorded, and after each sensor group is installed, the heat preservation of the pipeline monitoring position of the fluctuation pipe of the voltage stabilizer to be tested is recovered. Meanwhile, each temperature sensor group should ensure good heat preservation and pay attention to forced circulation of nearby cold air.
Setting the fluctuation tube of the voltage stabilizer to be tested under a preset condition, and measuring the temperature data and the displacement data of the fluctuation tube of the voltage stabilizer to be tested in a measuring mode by utilizing the set temperature sensor group and the set displacement sensor group.
The setting of the specific preset conditions is realized by controlling the temperature of a main loop of the nuclear power plant, which is connected with a surge tube of the voltage stabilizer to be tested, and the setting of the main loop of the nuclear power plant specifically comprises the heating stage and the cooling stage. The temperature rising stage comprises a stage that the temperature of a main loop of the nuclear power plant is sequentially raised to each temperature rising point in a preset temperature rising data set; the cooling stage comprises the stage that the temperature of the voltage stabilizer is sequentially reduced to each cooling point in the preset cooling data set. It should be noted that, when the main loop of the nuclear power plant is heated to each heating point or cooled to each cooling point, heating or cooling is suspended for a preset period of time, so as to accurately detect temperature data and displacement data of the to-be-tested voltage regulator fluctuation tube at the heating point or cooling point, and meanwhile, avoid the problems of high stress and local plastic deformation of the to-be-tested voltage regulator fluctuation tube caused by too fast heating or cooling of the to-be-tested voltage regulator fluctuation tube. Preferably, the preset time period is 1 hour. Preferably, the temperature increase points in the preset temperature increase data set include 250°f, 350°f, and 450°f, and the temperature decrease points in the preset temperature decrease data set include 450°f and 350°f.
The temperature sensor group and the displacement sensor group measure the temperature data and the displacement data of the fluctuation tube of the voltage stabilizer to be tested in a measuring mode, and the temperature data and the displacement data specifically comprise:
when the temperature change value of any one temperature sensor in all the temperature sensor groups is larger than the temperature change threshold value by 2 degrees or the temperature difference value of the top temperature sensor and the bottom temperature sensor set in any one temperature sensor group is larger than the temperature difference threshold value by 2 degrees (1.11 ℃), all the temperature sensor groups and the displacement sensor groups conduct data recording once. When the change of the displacement value of any one of the displacement sensors in all the displacement sensor groups is larger than the displacement change threshold value of 0.1inch (2.54 mm), all the temperature sensor groups and the displacement sensor groups conduct data recording once. When the temperature of the main loop of the nuclear power plant is sequentially increased to each heating point in a preset heating data set or is reduced to each cooling point in a preset cooling data set, the main loop of the nuclear power plant pauses heating or cooling for a preset time period, and when the main loop of the nuclear power plant finishes pausing for the preset time period, all the temperature sensor sets and the displacement sensor sets perform primary data recording; and when all the temperature sensor groups and the displacement sensor groups do not record data in a preset intermittent time period, recording data once by all the temperature sensor groups and the displacement sensor groups of the to-be-tested voltage stabilizer fluctuation tube. Preferably, the preset break period is 24 hours.
It should be noted that when the stabilizer to be tested surge tube is operated in the power plant mode 6, the temperature change threshold and the temperature difference threshold may be expanded to ±10°f, and the displacement change threshold may be expanded to ±0.5inch.
After the temperature data is obtained, temperature difference data are calculated according to the temperature data, so that the subsequent judgment of the preset parameter requirements is facilitated.
Specifically, in order to better explain the process of calculating the temperature difference data according to the temperature data, data obtained by performing data recording once on all the temperature sensor groups is set as one group of temperature sub-data, and then the temperature data comprises a plurality of groups of temperature sub-data. The calculating the temperature difference data according to the temperature data specifically comprises: the data recorded by two adjacent temperature sensors in each temperature sensor group in each group of temperature sub-data are subjected to difference to obtain adjacent sensor temperature difference data groups; and taking the difference between the data recorded by the same temperature sensors of all adjacent two temperature rising points in the preset temperature rising data set, taking the difference between the data recorded by the same temperature sensors of all adjacent two temperature reducing points in the preset temperature reducing data set to obtain an adjacent temperature point temperature difference data set, and taking the obtained adjacent sensor temperature difference data set and the obtained adjacent temperature point temperature difference data set as temperature difference data. It should be noted that, the temperature of the heating points in the preset heating data set are sequentially arranged from small to large, and the temperature of the cooling points in the preset cooling data set are sequentially arranged from large to small.
Step S103, judging whether the temperature difference data and the displacement data meet the preset parameter requirements, if yes, turning to step S104, otherwise turning to step S107.
Specifically, judging whether the adjacent sensor temperature difference data in the adjacent sensor temperature difference data set are smaller than a preset adjacent sensor temperature difference threshold value, if yes, judging the adjacent temperature point temperature difference data set, otherwise, judging that the temperature difference data do not meet the preset parameter requirement; judging whether the adjacent temperature point temperature difference data in the adjacent temperature point temperature difference data set are smaller than a preset Xiang Wen point temperature difference threshold value, if yes, judging that the temperature difference data meet the preset parameter requirement, otherwise, judging that the temperature difference data do not meet the preset parameter requirement; judging whether the displacement data is smaller than a preset displacement threshold, if yes, judging that the displacement data meets the preset parameter requirement, otherwise, judging that the displacement data does not meet the preset parameter requirement; preferably, the preset temperature point differential threshold is 300°f. Further, the judgment of the temperature difference data is as follows: judging whether the displacement data is smaller than a preset displacement threshold value, if yes, judging that the displacement data meets the preset parameter requirement, and turning to step S104; otherwise, the process goes to step S107. Preferably, the preset displacement threshold may be set according to customer requirements.
And step S104, constructing a fluid analysis model of the surge tube of the voltage stabilizer to be tested based on the temperature parameter data set in the temperature data.
Specifically, when data obtained by performing data recording on all the temperature sensor groups once is used as a set of temperature sub-data, namely, when the set temperature data comprises a plurality of sets of temperature sub-data, and when the temperature sensor groups are arranged on the to-be-tested voltage stabilizer fluctuation tube, the first type of preset positions are arranged to comprise the head end and the tail end of the to-be-tested voltage stabilizer fluctuation tube, and the head end and the tail end of the to-be-tested voltage stabilizer fluctuation tube are both provided with the temperature sensor groups. And setting the data measured by the temperature sensor groups arranged at the head end and the tail end of the fluctuation tube of the voltage stabilizer to be tested in each group of temperature sub-data as temperature parameter data, wherein the temperature parameter data set is a set formed by combining the temperature parameter data measured by the temperature sensor groups arranged at the head end and the tail end of the fluctuation tube of the voltage stabilizer to be tested in a plurality of temperature sub-data in the temperature data. And then constructing a fluid analysis model of the to-be-tested stabilizer fluctuation tube based on the temperature parameter data set, wherein the fluid analysis model of the to-be-tested stabilizer fluctuation tube is constructed by utilizing Computational Fluid Dynamics (CFD) software in ANSYS.
Step S105, intercepting cross sections of positions of each temperature sensor group when the fluid analysis model is under different intercepting conditions as temperature detection surfaces, comparing whether data measured by each temperature sensor group under different intercepting conditions are all within a preset error range or not based on the temperature detection surfaces, if so, turning to step S106, otherwise, turning to step S107.
Specifically, the condition that all the temperature sensor groups and the displacement sensor groups perform one-time data recording after the main loop of the nuclear power plant is set to finish suspending the preset time period is set as the interception condition. And respectively setting the fluid analysis models under the intercepting condition, and intercepting cross sections of the to-be-tested voltage stabilizer at the positions of the fluctuation tubes at corresponding moments as temperature detection surfaces. And comparing the intercepted temperature detection surfaces with data measured by temperature sensors at positions corresponding to the corresponding conditions respectively to judge whether the data measured by the temperature sensors under the current conditions are all within a preset error range, and turning to the step S106, otherwise turning to the step S107.
When comparing the data measured by the temperature sensor with the data on the cross section, it should be the comparison at the same position under the same conditions. Meanwhile, it should be noted that, because the fluid analysis model of the to-be-tested voltage stabilizer fluctuation tube is constructed based on the temperature parameter data set, and the temperature parameter data set is a set formed by temperature parameter data measured by temperature sensor groups arranged at the head end and the tail end of the to-be-tested voltage stabilizer fluctuation tube in each group of temperature sub-data, when judging whether the data measured by each temperature sensor group under different interception conditions are all within a preset error range, the judgment whether the data measured by the temperature sensor groups arranged at the head end and the tail end of the to-be-tested voltage stabilizer fluctuation tube under different interception conditions are all within the preset error range can be also performed.
And S106, judging that the thermal stratification test of the fluctuation tube of the voltage stabilizer to be tested is successful, wherein the fluctuation tube of the voltage stabilizer to be tested meets the fatigue design requirement, namely meets the working requirement.
And step S107, judging that the thermal delamination test of the surge tube of the voltage stabilizer to be tested fails, wherein the surge tube of the voltage stabilizer to be tested does not meet the fatigue design requirement.
According to the thermal stratification test method for the voltage regulator fluctuation tube, provided by the embodiment of the invention, the temperature sensor groups and the displacement sensor groups are arranged at a plurality of positions of the voltage regulator fluctuation tube, and the temperature data and the displacement data of the voltage regulator fluctuation tube detected by the temperature sensor groups and the displacement sensor groups under different conditions are compared with the preset threshold value of the voltage regulator fluctuation tube, so that the success of the thermal stratification test of the voltage regulator fluctuation tube to be tested is primarily judged; and then, constructing a fluid analysis model of the to-be-tested voltage stabilizer fluctuation tube based on a temperature parameter data set in the temperature data, intercepting temperature detection surfaces under different interception conditions, comparing data measured by a temperature sensor under the interception conditions with corresponding parameter data on the temperature detection surfaces, and further judging that the thermal stratification test of the to-be-tested voltage stabilizer fluctuation tube is successful, wherein the to-be-tested voltage stabilizer fluctuation tube meets the fatigue design requirement. Through the real-time monitoring of the temperature of the thermal stratification of the surge tube of the voltage stabilizer to be tested, the real-time monitoring related data of the thermal stratification of the surge tube is obtained, and whether the surge tube of the voltage stabilizer to be tested meets the fatigue design requirement is judged.
Although the embodiments of the present invention are disclosed above, the embodiments are only used for the convenience of understanding the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the present disclosure as defined by the appended claims.
Claims (9)
1. A thermal stratification test method of a surge tube of a voltage stabilizer comprises the following steps:
respectively installing a temperature sensor group at a first type preset position of a surge tube of the voltage stabilizer to be tested, and installing a displacement sensor group at a second type preset position of the surge tube of the voltage stabilizer to be tested;
all the temperature sensor groups and the displacement sensor groups measure temperature data of a first type preset position and displacement data of a second type preset position of the fluctuation tube of the voltage stabilizer to be tested under a preset condition according to a preset measurement mode, and temperature difference data are calculated according to the temperature data;
judging whether the temperature difference data and the displacement data meet preset parameter requirements, if so, constructing a fluid analysis model of the to-be-tested voltage stabilizer fluctuation tube based on a temperature parameter data set in the temperature data, otherwise, judging that the thermal stratification test of the to-be-tested voltage stabilizer fluctuation tube fails;
intercepting cross sections of positions of all temperature sensor groups when the fluid analysis model is under different interception conditions as temperature detection surfaces, and comparing whether data measured by all temperature sensor groups under different interception conditions are all within a preset error range or not based on the temperature detection surfaces, if so, judging that the thermal stratification test of the to-be-tested voltage regulator fluctuation tube is successful, and if not, judging that the thermal stratification test of the to-be-tested voltage regulator fluctuation tube fails, and the to-be-tested voltage regulator fluctuation tube does not meet the fatigue design requirement, wherein all interception conditions are included in the preset conditions;
the preset measurement mode comprises the following steps:
when the temperature of the main loop of the nuclear power plant is sequentially increased to each heating point in a preset heating data set or is reduced to each cooling point in a preset cooling data set, the main loop of the nuclear power plant pauses heating or cooling for a preset time period, and when the main loop of the nuclear power plant completes pausing for the preset time period, all the temperature sensor sets and the displacement sensor sets perform one-time data recording,
setting the condition when all the temperature sensor groups and the displacement sensor groups perform one-time data recording after the main loop of the nuclear power plant finishes suspending for a preset period of time as a interception condition,
and taking data obtained by carrying out data recording on all the temperature sensor groups once as a group of temperature sub-data, wherein the temperature parameter data set in the temperature data is a set formed by temperature parameter data measured by the temperature sensor groups arranged at the head end and the tail end of the fluctuation tube of the voltage stabilizer to be tested in each group of temperature sub-data.
2. The test method according to claim 1, wherein the preset conditions include:
the main loop of the nuclear power plant connected with the fluctuation pipe of the voltage stabilizer to be tested is in a heating stage; and
the main loop of the nuclear power plant connected with the fluctuation pipe of the voltage stabilizer to be tested is in a cooling stage,
the temperature rising stage comprises a stage that the temperature of the main loop of the nuclear power plant is sequentially raised to each temperature rising point in a preset temperature rising data set;
the cooling stage comprises a stage that the temperature of the voltage stabilizer is sequentially reduced to each cooling point in a preset cooling data set.
3. The test method of claim 2, wherein the elevated temperature points in the pre-set elevated temperature data set comprise 250°f, 350°f, and 450°f, and the reduced temperature points in the pre-set reduced temperature data set comprise 450°f and 350°f.
4. The test method according to claim 1, wherein the predetermined measurement mode further comprises:
when the temperature change value of any one temperature sensor in all the temperature sensor groups is larger than a temperature change threshold value by 2 degrees or the temperature difference value of the top temperature sensor and the bottom temperature sensor set in any one temperature sensor group is larger than a temperature difference threshold value by 2 degrees F, recording data of all the temperature sensor groups and the displacement sensor groups once;
when the change of the displacement value of any one of the displacement sensor groups is larger than the displacement change threshold value by 0.1inch, recording data of all the temperature sensor groups and the displacement sensor groups once;
and when all the temperature sensor groups and the displacement sensor groups do not record data in a preset intermittent time period, recording data once by all the temperature sensor groups and the displacement sensor groups of the to-be-tested voltage stabilizer fluctuation tube.
5. The method of claim 4, wherein the temperature change threshold and the temperature difference threshold are expandable to + -10 DEG F and the displacement change threshold is expandable to + -0.5 inch when the regulator to be tested is operating in a power plant mode.
6. The method of claim 2, wherein the temperature data comprises a plurality of sets of temperature sub-data;
calculating temperature difference data from the temperature data includes:
the data recorded by two adjacent temperature sensors in each temperature sensor group in each temperature sub-data group are subjected to difference making to obtain an adjacent sensor temperature difference data group;
and making differences between the data recorded by the same temperature sensors of two adjacent heating points in the preset heating data set, and making differences between the data recorded by the same temperature sensors of two adjacent cooling points in the preset cooling data set to obtain an adjacent temperature point temperature difference data set.
7. The test method of claim 6, wherein determining whether the temperature difference data and the displacement data both meet a preset parameter requirement comprises:
judging whether the adjacent sensor temperature difference data in the adjacent sensor temperature difference data set are smaller than a preset adjacent sensor temperature difference threshold value, if yes, judging the adjacent temperature point temperature difference data set, otherwise, judging that the temperature difference data do not meet preset parameter requirements;
judging whether the adjacent temperature point temperature difference data in the adjacent temperature point temperature difference data set are smaller than a preset adjacent temperature point temperature difference threshold value, if yes, judging that the temperature difference data meet preset parameter requirements, otherwise, judging that the temperature difference data do not meet the preset parameter requirements; judging whether the displacement data is smaller than a preset displacement threshold value, if yes, judging that the displacement data meets the preset parameter requirement, otherwise, judging that the displacement data does not meet the preset parameter requirement.
8. The method of claim 1, wherein the temperature data comprises a plurality of sets of temperature sub-data;
the first type of preset positions comprise the head end and the tail end of the surge tube of the voltage stabilizer to be tested.
9. The test method of claim 1, wherein the fluid analysis model is established using ANSYS computational fluid dynamics CFD software.
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