阅读说明：本技术 稳压器波动管热分层试验方法 (Thermal stratification test method for voltage stabilizer fluctuation tube ) 是由 章济 李国健 冯利法 褚凯 孙浈 管正刚 杨涛 李青华 李扬 曾道英 陈晓飞 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种稳压器波动管热分层试验方法,包括：分别在待试验的稳压器波动管上设置温度传感器组和位移传感器组；利用温度传感器组和位移传感器组监测稳压器波动管的温度数据和位移数据,并根据温度数据计算温差数据；判断温差数据和位移数据是否均符合预设参数要求,并基于温度数据中的温度参数数据集构建待试验稳压器波动管的流体分析模型,截取流体分析模型处于不同工况下各个温度传感器组所处位置处的横截面作为温度检测面,以验证波动管热分层效果。本发明通过对待试验稳压器波动管热分层温度的实时监测获得了波动管热分层的实时监测相关数据,进而判断待试验的稳压器波动管是否满足疲劳设计要求。(The invention discloses a thermal stratification test method for a voltage stabilizer surge tube, which comprises the following steps: respectively arranging a temperature sensor group and a displacement sensor group on a fluctuation tube of the voltage stabilizer to be tested; monitoring temperature data and displacement data of a 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; and judging whether the temperature difference data and the displacement data meet the preset parameter requirements or not, constructing a fluid analysis model of the fluctuation pipe of the voltage stabilizer to be tested based on a temperature parameter data set in the temperature data, and intercepting the cross section of the fluid analysis model at the position of each temperature sensor group under different working conditions as a temperature detection surface so as to verify the thermal stratification effect of the fluctuation pipe. According to the invention, the real-time monitoring related data of the thermal stratification of the fluctuation tube is obtained by monitoring the thermal stratification temperature of the fluctuation tube of the voltage stabilizer to be tested in real time, so that whether the fluctuation tube of the voltage stabilizer to be tested meets the fatigue design requirement is judged.)

1. A thermal stratification test method for a voltage stabilizer surge tube comprises the following steps:

respectively installing temperature sensor groups at a first type of preset position of the fluctuating pipe of the voltage stabilizer to be tested, and installing a displacement sensor group at a second type of preset position of the fluctuating pipe of the voltage stabilizer to be tested;

all the temperature sensor groups and the displacement sensor groups measure the temperature data of a first type of preset position and the displacement data of a second type of preset position of the fluctuating pipe of the voltage stabilizer to be tested under a preset condition according to a preset measuring mode, and calculate temperature difference data according to the temperature data;

judging whether the temperature difference data and the displacement data meet the preset parameter requirements, if so, constructing a fluid analysis model of the fluctuating pipe of the voltage stabilizer to be tested based on a temperature parameter data set in the temperature data, otherwise, judging that the thermal stratification test of the fluctuating pipe of the voltage stabilizer to be tested fails;

intercepting the cross section of the position of each temperature sensor group when the fluid analysis model is under different intercepting conditions as a temperature detection surface, comparing whether data measured by each temperature sensor group under different intercepting conditions are within a preset error range or not based on the temperature detection surface, if so, judging that the thermal stratification test of the fluctuation tube of the voltage stabilizer to be tested is successful, if not, judging that the fluctuation tube of the voltage stabilizer to be tested meets the fatigue design requirement, otherwise, judging that the thermal stratification test of the fluctuation tube of the voltage stabilizer to be tested is failed, and the fluctuation tube of the voltage stabilizer to be tested does not meet the fatigue design requirement, wherein all the intercepting conditions are contained in the preset conditions.

2. The detection method according to claim 1, wherein the preset condition comprises:

a main loop of the nuclear power plant connected with the surge pipe of the voltage stabilizer to be tested is in a temperature rise stage; and

the main loop of the nuclear power plant connected with the surge pipe of the voltage stabilizer to be tested is in a cooling stage,

the temperature rise stage comprises a stage that the temperature of the main loop of the nuclear power plant is sequentially raised to each temperature rise point in a preset temperature rise data set;

and 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 detection method according to claim 2, wherein the temperature-increasing points in the preset temperature-increasing data set include 250 ° F, 350 ° F, and 450 ° F, and the temperature-decreasing points in the preset temperature-decreasing data set include 450 ° F and 350 ° F.

4. The detection method according to claim 1, wherein the preset measurement mode comprises:

when the temperature change value of any one temperature sensor in all the temperature sensor groups is greater than a temperature change threshold value by 2 degrees or the temperature difference value between a top temperature sensor and a bottom temperature sensor set in any one temperature sensor group is greater than a temperature difference threshold value by 2 degrees F, performing data recording on all the temperature sensor groups and a displacement sensor group for one time;

when the displacement value change of any one displacement sensor in all the displacement sensor groups is larger than a displacement change threshold value of 0.1inch, performing one-time data recording on all the temperature sensor groups and the displacement sensor groups;

when the temperature of the main loop of the nuclear power plant sequentially rises to each temperature rising point in a preset temperature rising data set or falls to each temperature falling point in a preset temperature falling data set, the main loop of the nuclear power plant pauses in temperature rising or temperature falling 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 groups and the displacement sensor groups perform primary data recording;

and when all the temperature sensor groups and all the displacement sensor groups do not carry out data recording in a preset discontinuous time period, carrying out one-time data recording on all the temperature sensor groups and all the displacement sensor groups of the fluctuation tube of the voltage stabilizer to be tested.

5. The test method according to claim 4, wherein the temperature variation threshold and the temperature difference threshold can be expanded to ± 10 ° F and the displacement variation threshold can be expanded to ± 0.5inch for the stabilizer surge pipe to be tested in the power plant mode 6 operation.

6. The detection method according to claim 4, wherein the condition when the primary loop of the nuclear power plant stops for a preset time period and then data recording is performed on all the temperature sensor groups and the displacement sensor groups is set as a preset interception condition.

7. The detection method according to claim 2, wherein data obtained by performing data recording on all the temperature sensor groups once is used as a group of temperature sub-data, and the temperature data comprises a plurality of groups of temperature sub-data;

calculating preset temperature difference data according to the temperature data comprises:

subtracting data recorded by two adjacent temperature sensors in each temperature sensor group in each group of temperature subdata to obtain an adjacent sensor temperature difference data group;

and subtracting the data recorded by the same temperature sensors at two adjacent temperature-rising points in the preset temperature-rising data set, and subtracting the data recorded by the same temperature sensors at two adjacent temperature-falling points in the preset temperature-falling data set to obtain a temperature difference data set at the two adjacent temperature points.

8. The detection method according to claim 7, wherein judging whether the preset temperature difference data and the displacement data both meet preset parameter requirements comprises:

judging whether the temperature difference data of adjacent sensors in the temperature difference data group of the adjacent sensors are all smaller than a preset temperature difference threshold value of the adjacent sensors, if so, judging the temperature difference data group of the adjacent temperature points, and otherwise, judging that the preset 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 group are all smaller than a preset phase temperature point temperature difference threshold value, if so, judging that the preset temperature difference data meet the preset parameter requirement, otherwise, judging that the preset temperature difference data do not meet the preset parameter requirement;

and judging whether the displacement data is smaller than a preset displacement threshold value, if so, judging that the displacement data meets the preset parameter requirement, otherwise, judging that the displacement data does not meet the preset parameter requirement.

9. The testing method of claim 1, wherein data obtained by performing data recording on all the temperature sensor groups at one time is used as a set of temperature sub-data, and 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 a surge pipe of the voltage stabilizer to be tested,

and 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 pipe of the voltage stabilizer to be tested in each group of temperature subdata.

10. The method of testing as claimed in claim 1, wherein the fluid analysis model is created using computational fluid dynamics CFD software of ANSYS.

Technical Field

The invention relates to the technical field of nuclear power station nuclear primary equipment debugging, in particular to a thermal stratification test method for a voltage stabilizer fluctuation tube.

Background

In the technical field of nuclear power, a voltage stabilizer surge pipe (called surge pipe for short) is used for connecting a voltage stabilizer and a main coolant pipeline hot section, 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 coolant in the voltage stabilizer is high in temperature and low in density, the coolant occupies the upper part of the section of the surge pipe; the coolant in the main pipeline has low temperature and high density, occupies the lower part of the section of the fluctuation pipe, and is called thermal stratification of the fluctuation pipe of the voltage stabilizer in engineering. Thermal stratification within a surge tube can cause wall temperature stratification, thereby causing gross bending thermal stresses and localized thermal stresses in the surge tube section, producing undesirable displacement and support loads. This phenomenon may threaten the integrity of the surge pipe, creating a safety hazard to the normal operation of the nuclear power plant.

The regulator fluctuation tube needs to be strictly tested before being put into a nuclear power plant, so a relatively perfect thermal stratification test method for the regulator fluctuation tube is needed, but a relatively standard thermal stratification test method for the regulator fluctuation tube is not available in the existing market.

Disclosure of Invention

The invention aims to solve the technical problem that a relatively perfect thermal stratification test method for the fluctuation tube of the voltage stabilizer is not available at the present stage, and equipment damage caused by thermal stratification of the fluctuation tube can occur if the fluctuation tube of the voltage stabilizer is directly put into use.

In order to solve the technical problem, the invention provides a thermal stratification test method for a voltage stabilizer surge tube, which comprises the following steps:

respectively installing temperature sensor groups at a first type of preset position of the fluctuating pipe of the voltage stabilizer to be tested, and installing a displacement sensor group at a second type of preset position of the fluctuating pipe of the voltage stabilizer to be tested;

all the temperature sensor groups and the displacement sensor groups measure the temperature data of a first type of preset position and the displacement data of a second type of preset position of the fluctuating pipe of the voltage stabilizer to be tested under a preset condition according to a preset measuring mode, and calculate temperature difference data according to the temperature data;

judging whether the temperature difference data and the displacement data meet the preset parameter requirements, if so, constructing a fluid analysis model of the fluctuating pipe of the voltage stabilizer to be tested based on a temperature parameter data set in the temperature data, otherwise, judging that the thermal stratification test of the fluctuating pipe of the voltage stabilizer to be tested fails;

intercepting the cross section of the position of each temperature sensor group when the fluid analysis model is under different intercepting conditions as a temperature detection surface, comparing whether data measured by each temperature sensor group under different intercepting conditions are within a preset error range or not based on the temperature detection surface, if so, judging that the thermal stratification test of the fluctuation tube of the voltage stabilizer to be tested is successful, if not, judging that the fluctuation tube of the voltage stabilizer to be tested meets the fatigue design requirement, otherwise, judging that the thermal stratification test of the fluctuation tube of the voltage stabilizer to be tested is failed, and the fluctuation tube of the voltage stabilizer to be tested does not meet the fatigue design requirement, wherein all the intercepting conditions are contained in the preset conditions.

Preferably, the preset conditions include:

a main loop of the nuclear power plant connected with the surge pipe of the voltage stabilizer to be tested is in a temperature rise stage; and

the main loop of the nuclear power plant connected with the surge pipe of the voltage stabilizer to be tested is in a cooling stage,

the temperature rise stage comprises a stage that the temperature of the main loop of the nuclear power plant is sequentially raised to each temperature rise point in a preset temperature rise data set;

and 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 rise points in the preset temperature rise data set include 250 ° F, 350 ° F and 450 ° F, and the temperature fall points in the preset temperature fall data set include 450 ° F and 350 ° F.

Preferably, the preset measuring method includes:

when the temperature change value of any one temperature sensor in all the temperature sensor groups is greater than a temperature change threshold value by 2 degrees or the temperature difference value between a top temperature sensor and a bottom temperature sensor set in any one temperature sensor group is greater than a temperature difference threshold value by 2 degrees F, performing data recording on all the temperature sensor groups and a displacement sensor group for one time;

when the displacement value change of any one displacement sensor in all the displacement sensor groups is larger than a displacement change threshold value of 0.1inch, performing one-time data recording on all the temperature sensor groups and the displacement sensor groups;

when the temperature of the main loop of the nuclear power plant sequentially rises to each temperature rising point in a preset temperature rising data set or falls to each temperature falling point in a preset temperature falling data set, the main loop of the nuclear power plant pauses in temperature rising or temperature falling 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 groups and the displacement sensor groups perform primary data recording;

and when all the temperature sensor groups and all the displacement sensor groups do not carry out data recording in a preset discontinuous time period, carrying out one-time data recording on all the temperature sensor groups and all the displacement sensor groups of the fluctuation tube of the voltage stabilizer to be tested.

Preferably, the temperature change threshold and the temperature difference threshold can be expanded to +/-10 degrees Fahrenheit and the displacement change threshold can be expanded to +/-0.5 inch for the stabilizer surge pipe to be tested in the power plant mode 6 operation condition.

Preferably, the condition when the primary loop of the nuclear power plant completes the primary data recording of all the temperature sensor groups and the displacement sensor groups after the primary loop of the nuclear power plant completes the pause for the preset time period is set as a preset interception condition.

Preferably, data obtained by performing data recording on all the temperature sensor groups once is used as a group of temperature sub-data, and the temperature data comprises a plurality of groups of temperature sub-data;

calculating preset temperature difference data according to the temperature data comprises:

subtracting data recorded by two adjacent temperature sensors in each temperature sensor group in each group of temperature subdata to obtain an adjacent sensor temperature difference data group;

and subtracting the data recorded by the same temperature sensors at two adjacent temperature-rising points in the preset temperature-rising data set, and subtracting the data recorded by the same temperature sensors at two adjacent temperature-falling points in the preset temperature-falling data set to obtain a temperature difference data set at the two adjacent temperature points.

Preferably, the judging whether the preset temperature difference data and the displacement data both meet the preset parameter requirement comprises:

judging whether the temperature difference data of adjacent sensors in the temperature difference data group of the adjacent sensors are all smaller than a preset temperature difference threshold value of the adjacent sensors, if so, judging the temperature difference data group of the adjacent temperature points, and otherwise, judging that the preset 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 group are all smaller than a preset phase temperature point temperature difference threshold value, if so, judging that the preset temperature difference data meet the preset parameter requirement, otherwise, judging that the preset temperature difference data do not meet the preset parameter requirement;

and judging whether the displacement data is smaller than a preset displacement threshold value, if so, 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 a 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 a surge pipe of the voltage stabilizer to be tested,

and 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 pipe of the voltage stabilizer to be tested in each group of temperature subdata.

Preferably, the fluid analysis model is created using the computational fluid dynamics CFD software of ANSYS.

Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:

by applying the thermal stratification test method for the fluctuation tube of the voltage stabilizer, 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 fluctuation tube of the voltage stabilizer, and the temperature data and the displacement data of the fluctuation tube of the voltage stabilizer, which are detected by the temperature sensor groups and the displacement sensor groups, under different conditions are compared with the preset threshold value of the fluctuation tube of the voltage stabilizer, so that the qualification of the fluctuation tube of the voltage stabilizer to be tested is preliminarily judged; and then constructing a fluid analysis model of the fluctuating pipe of the voltage stabilizer to be tested based on a temperature parameter data set in the temperature data, intercepting temperature detection surfaces under different intercepting conditions, comparing data measured by a temperature sensor under the intercepting conditions with corresponding parameter data on the temperature detection surfaces, and further judging that the thermal stratification test of the fluctuating pipe of the voltage stabilizer to be tested is successful, wherein the fluctuating pipe of the voltage stabilizer to be tested meets the fatigue design requirement. Through the real-time monitoring of the thermal layering temperature of the fluctuation tube of the voltage stabilizer to be tested, the related data of the real-time monitoring of the thermal layering of the fluctuation tube are obtained, and then the success of the thermal layering test of the fluctuation tube of the voltage stabilizer to be tested is judged, and the fluctuation tube of the voltage stabilizer to be tested can 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 the 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, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic flow chart illustrating a thermal stratification test method for a regulator surge tube according to an embodiment of the present invention;

fig. 2 shows an arrangement manner of a temperature sensor group and a displacement sensor group on a surge pipe of a voltage stabilizer to be tested in the thermal stratification test method of the voltage stabilizer surge pipe according to the embodiment of the invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.

Because the coolant in the voltage stabilizer is high in temperature and low in density, the coolant occupies the upper part of the section of the surge pipe; the coolant in the main pipeline has low temperature and high density, occupies the lower part of the section of the fluctuation pipe, and is called thermal stratification of the fluctuation pipe of the voltage stabilizer in engineering. Thermal stratification within a surge tube can cause wall temperature stratification, thereby causing gross bending thermal stresses and localized thermal stresses in the surge tube section, producing undesirable displacement and support loads. This phenomenon may threaten the integrity of the surge pipe, creating a safety hazard to the normal operation of the nuclear power plant.

The regulator fluctuation tube needs to be strictly tested before being put into a nuclear power plant, so a relatively perfect thermal stratification test method for the regulator fluctuation tube is needed, but a relatively standard thermal stratification test method for the regulator fluctuation tube is not available in the existing market.

Example one

In order to solve the technical problems in the prior art, the embodiment of the invention provides a thermal stratification test method for a voltage stabilizer fluctuation tube.

FIG. 1 is a schematic flow chart illustrating a thermal stratification test method for a regulator surge tube according to an embodiment of the present invention; referring to fig. 1, the thermal stratification test method for the surge tank of the voltage stabilizer in the embodiment of the invention comprises the following steps.

Step S101, respectively arranging a temperature sensor group at a first type of preset position of a fluctuating pipe of the voltage stabilizer to be tested, and arranging a displacement sensor group at a second type of preset position of the fluctuating pipe of the voltage stabilizer to be tested.

Specifically, the surge pipe of the voltage stabilizer to be tested is installed between the voltage stabilizer and a reactor main loop, so that the thermal layering test of the surge pipe of the voltage stabilizer to be tested is carried out during the thermal test of the power plant. Specifically, temperature sensor groups are respectively arranged at a first type of preset position of a fluctuation tube of the voltage stabilizer to be tested, and a displacement sensor group is arranged at a second type of preset position of the fluctuation tube of the voltage stabilizer to be tested. Fig. 2 shows an arrangement manner of a temperature sensor group and a displacement sensor group on a surge tube of a voltage stabilizer to be tested in the voltage stabilizer surge tube detection method according to the embodiment of the invention. Referring to fig. 2, in the present embodiment, preferably, the first type of preset positions (fig. 2 is referred to for the first type of preset positions) are set at 10 of the surge pipe of the voltage stabilizer to be tested, and the temperature sensor group T1 to the temperature sensor group T10 are sequentially set at the first type of preset positions. Each temperature sensor group comprises five temperature sensors, and the five temperature sensors are uniformly and annularly arranged on a half of fluctuation pipes of the voltage stabilizer to be tested. It should be noted that each temperature sensor group includes a pair of temperature sensors installed on the surge pipe of the voltage stabilizer to be tested, and one of the temperature sensors is set as a top sensor, and the other is set as a bottom sensor. The temperature sensor has a temperature detection range of 70 to 700 degrees fahrenheit with an accuracy of ± 1 degree fahrenheit. Meanwhile, in the embodiment, preferably, 8 key positions of the surge tube of the voltage stabilizer to be tested are selected as second-class preset positions (the second-class preset positions can be set with reference to fig. 2), and the displacement sensor group D1-D8 are sequentially arranged at the second-class preset positions. Wherein the displacement measurements are taken at each of the above positions in a horizontal direction and in a vertical direction perpendicular to the pipeline axis to ensure that the displacement measurements are provided at different axial positions of the surge pipe of the potentiostat 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 the temperature sensors included in the temperature sensor group may also be other reasonable values.

And S102, measuring the temperature data of the first type of preset position and the displacement data of the second type of preset position of the fluctuating pipe of the voltage stabilizer to be tested under the preset condition by all the temperature sensor groups and the displacement sensor groups according to a preset measuring mode, and calculating temperature difference data according to the temperature data.

Specifically, before measurement, the normal use of each installed temperature sensor group and displacement sensor group is ensured, the installation position is recorded, and the heat preservation of the pipeline monitoring position of the fluctuation pipe of the voltage stabilizer to be tested is recovered after each sensor group is installed. Meanwhile, each temperature sensor group is required to ensure good heat preservation, and the forced circulation of nearby cold air is paid attention to.

The method comprises the steps of setting a fluctuating pipe of the voltage stabilizer to be tested under a preset condition, and measuring temperature data and displacement data of the fluctuating pipe of the voltage stabilizer to be tested by utilizing a temperature sensor group and a displacement sensor group which are arranged in a measuring mode.

The specific preset condition is set by controlling the temperature of a main loop of the nuclear power plant connected with a fluctuating pipe of the voltage stabilizer to be tested, and the specific preset condition comprises the step of setting the main loop of the nuclear power plant to be in a temperature rising stage and a cooling stage. The temperature rise stage comprises a stage that the temperature of a main loop of the nuclear power plant is sequentially raised to each temperature rise point in a preset temperature rise 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. It should be noted that, when the temperature of the main loop of the nuclear power plant is raised to each temperature raising point or lowered to each temperature lowering point, the temperature raising or lowering is suspended for a preset time period, so as to accurately detect the temperature data and displacement data of the fluctuating pipe of the voltage stabilizer to be tested at the temperature raising point or the temperature lowering point, and simultaneously avoid the problems of high stress, local plastic deformation and the like of the fluctuating pipe of the voltage stabilizer to be tested, which are caused by too fast temperature raising or lowering of the fluctuating pipe of the voltage stabilizer to be tested. Preferably, the preset period of time 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 data and the displacement data of the temperature sensor group and the displacement sensor group which measure the fluctuation tube of the voltage stabilizer to be tested through a measuring mode specifically comprise:

when the temperature change value of any temperature sensor in all the temperature sensor groups is larger than the temperature change threshold value by 2 degrees or the temperature difference value between the top temperature sensor and the bottom temperature sensor set in any temperature sensor group is larger than the temperature difference threshold value by 2 degrees F (1.11 degrees C.), the data recording is carried out on all the temperature sensor groups and the displacement sensor group. When the displacement value change of any one displacement sensor in all the displacement sensor groups is larger than the displacement change threshold value of 0.1inch (2.54mm), all the temperature sensor groups and the displacement sensor groups perform data recording once. When the temperature of a main loop of a nuclear power plant sequentially rises to each temperature rising point in a preset temperature rising data set or falls to each temperature falling point in a preset temperature falling data set, the main loop of the nuclear power plant pauses temperature rising or temperature falling for a preset time period, and after the main loop of the nuclear power plant finishes pausing for the preset time period, all temperature sensor groups and displacement sensor groups perform primary data recording; and when all the temperature sensor groups and all the displacement sensor groups do not record data in a preset discontinuous time period, recording data once for all the temperature sensor groups and all the displacement sensor groups of the fluctuation pipe of the voltage stabilizer to be tested. Preferably, the preset off-time period is 24 hours.

It should be noted that when the surge pipe of the stabilizer to be tested is operated in the plant mode 6, the temperature variation threshold and the temperature difference threshold may be enlarged to + -10 deg.F, and the displacement variation threshold may be enlarged to + -0.5 inch.

After the temperature data is obtained, the preset temperature difference data is calculated according to the temperature data, so that the requirement of the preset parameters can be judged subsequently.

Specifically, in order to better explain the process of calculating the preset temperature difference data according to the temperature data, data obtained by performing data recording on all the temperature sensor groups for one time is set as a group of temperature sub-data, and the temperature data includes a plurality of groups of temperature sub-data. Calculating preset temperature difference data according to the temperature data specifically comprises the following steps: data recorded by two adjacent temperature sensors in each temperature sensor group in each group of temperature subdata is subjected to difference to obtain an adjacent sensor temperature difference data group; and (3) performing difference on data recorded by the same temperature sensors at all the adjacent two temperature-rising points in the preset temperature-rising data set, performing difference on data recorded by the same temperature sensors at all the adjacent two temperature-falling points in the preset temperature-falling data set to obtain an adjacent temperature point temperature difference data set, and taking the obtained adjacent sensor temperature difference data set and the adjacent temperature point temperature difference data set as preset temperature difference data. It should be noted that the temperature of the temperature-increasing points in the preset temperature-increasing data set are arranged from small to large, and the temperature of the temperature-decreasing points in the preset temperature-decreasing data set are arranged from large to small.

And step S103, judging whether the temperature difference data and the displacement data meet the preset parameter requirements, if so, turning to step S104, and otherwise, turning to step S107.

Specifically, whether the temperature difference data of adjacent sensors in the temperature difference data groups of adjacent sensors are smaller than a preset temperature difference threshold value of adjacent sensors is judged, if yes, the temperature difference data groups of adjacent temperature points are judged, and if not, the preset temperature difference data are judged not to meet the preset parameter requirement; judging whether the adjacent temperature point temperature difference data in the adjacent temperature point temperature difference data group are all smaller than a preset phase temperature point temperature difference threshold value, if so, judging that the preset temperature difference data meet the preset parameter requirement, otherwise, judging that the preset temperature difference data do not meet the preset parameter requirement; judging whether the displacement data is smaller than a preset displacement threshold value, if so, judging that the displacement data meets the preset parameter requirement, and otherwise, judging that the displacement data does not meet the preset parameter requirement; preferably, the preset temperature point temperature difference threshold is 300 ° F. Further, the judgment of the preset temperature difference data is as follows: judging whether the displacement data is smaller than a preset displacement threshold value, if so, judging that the displacement data meets the preset parameter requirement, and turning to the step S104; otherwise go to step S107. Preferably, the preset displacement threshold value can be set according to the requirements of customers.

And step S104, constructing a fluid analysis model of the fluctuating pipe of the voltage stabilizer to be tested based on the temperature parameter data set in the temperature data.

Specifically, when data obtained by recording data of all the temperature sensor groups once is used as a group of temperature subdata, namely, set temperature data comprises a plurality of groups of temperature subdata, and a first type of preset position is set when the temperature sensor group is arranged on a voltage stabilizer fluctuation pipe to be tested, wherein the first type of preset position comprises the head end and the tail end of the voltage stabilizer fluctuation pipe to be tested, and the head end and the tail end of the voltage stabilizer fluctuation pipe to be tested are both provided with the temperature sensor group. On the basis of the temperature parameter data set, the data measured by the temperature sensor groups arranged at the head end and the tail end of the fluctuation pipe of the voltage stabilizer to be tested in each group of temperature subdata is set as the temperature parameter data, and 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 pipe of the voltage stabilizer to be tested in a plurality of temperature subdata in the temperature data. And then constructing a fluid analysis model of the fluctuating pipe of the voltage stabilizer to be tested based on the temperature parameter data set, wherein the fluid analysis model of the fluctuating pipe of the voltage stabilizer to be tested is constructed by using Computational Fluid Dynamics (CFD) software in ANSYS.

Step S105, intercepting the cross section of the position of each temperature sensor group when the fluid analysis model is under different interception conditions as a temperature detection surface, comparing whether the data measured by each temperature sensor group under different interception conditions are within a preset error range or not based on the temperature detection surface, if so, turning to step S106, and otherwise, turning to step S107.

Specifically, the condition when the primary circuit of the nuclear power plant completes pause for a preset time period and then all the temperature sensor groups and the displacement sensor groups record data for one time is set as a preset interception condition. And respectively setting the fluid analysis model under a preset intercepting condition, and intercepting the cross sections of the fluctuation pipes of the voltage stabilizer to be tested at corresponding moments as temperature detection surfaces. And then comparing the plurality of intercepted temperature detection surfaces with data measured by the temperature sensor groups at the positions corresponding to the corresponding conditions respectively to judge whether the data measured by each temperature sensor under the current condition 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, the comparison is performed at the same position under the same condition. Meanwhile, it should be noted that, because the fluid analysis model of the surge pipe of the voltage stabilizer to be tested 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 the temperature sensor groups arranged at the head end and the tail end of the surge pipe of the voltage stabilizer to be tested in each group of temperature subdata, when judging whether the data measured by each temperature sensor group under different interception conditions are all within the preset error range, the judgment whether the data measured by the temperature sensor groups except the temperature sensor groups arranged at the head end and the tail end of the surge pipe of the voltage stabilizer to be tested are all within the preset error range can be carried out only on the data measured under different interception conditions.

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, the working requirement is met.

And S107, judging that the thermal stratification test of the fluctuation pipe of the voltage stabilizer to be tested fails, wherein the fluctuation pipe of the voltage stabilizer to be tested does not meet the fatigue design requirement.

The thermal stratification test method of the voltage stabilizer fluctuation tube provided by the embodiment of the invention comprises the steps of arranging temperature sensor groups and displacement sensor groups at a plurality of positions of the voltage stabilizer fluctuation tube, and comparing temperature data and displacement data of the voltage stabilizer fluctuation tube detected by the temperature sensor groups and the displacement sensor groups under different conditions with preset thresholds of the voltage stabilizer fluctuation tube to preliminarily judge the success of the thermal stratification test of the voltage stabilizer fluctuation tube to be tested; and then constructing a fluid analysis model of the fluctuating pipe of the voltage stabilizer to be tested based on a temperature parameter data set in the temperature data, intercepting temperature detection surfaces under different intercepting conditions, comparing data measured by a temperature sensor under the intercepting conditions with corresponding parameter data on the temperature detection surfaces, and further judging that the thermal stratification test of the fluctuating pipe of the voltage stabilizer to be tested is successful, wherein the fluctuating pipe of the voltage stabilizer to be tested meets the fatigue design requirement. The real-time monitoring related data of the thermal stratification of the fluctuation tube of the voltage stabilizer to be tested is obtained by monitoring the thermal stratification temperature of the fluctuation tube of the voltage stabilizer to be tested in real time, and then whether the fluctuation tube of the voltage stabilizer to be tested meets the fatigue design requirement is judged.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.