CN210268565U - Pipeline creep measurement system - Google Patents
Pipeline creep measurement system Download PDFInfo
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- CN210268565U CN210268565U CN201921623616.9U CN201921623616U CN210268565U CN 210268565 U CN210268565 U CN 210268565U CN 201921623616 U CN201921623616 U CN 201921623616U CN 210268565 U CN210268565 U CN 210268565U
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Abstract
The utility model discloses a pipeline creep measurement system, which comprises a pipeline to be measured, an ultrasonic module, a temperature module, an upper computer, a first ultrasonic transducer for generating ultrasonic signals, a second ultrasonic transducer for converting the received ultrasonic signals into electric signals and a temperature sensor for detecting the temperature of the pipeline wall of the pipeline to be measured; the host computer is connected with ultrasonic module and temperature module, the output of ultrasonic module is connected with first ultrasonic transducer, second ultrasonic transducer is connected with the input of ultrasonic module, temperature sensor is connected with temperature module's input, the ultrasonic wave that first ultrasonic transducer sent propagates to the second ultrasonic transducer behind the week surface of pipeline that awaits measuring, this system can measure the creep of pipeline, and have convenient operation, the accurate and the little characteristics of human error of testing result, can furthest avoid the influence of temperature variation to creep measuring result.
Description
Technical Field
The utility model relates to a digital measurement system, concretely relates to pipeline creep measurement system.
Background
The steam pipeline of the power station boiler can cause high-temperature creep damage when running under high-temperature and high-pressure working conditions for a long time, and the steam pipeline can be leaked or exploded due to the superposition of damage accumulation and stress to a certain degree, so that the safe running of a power station is seriously threatened. Through periodical creep measurement and data analysis of the pipeline, the creep rule of the metal of the steam pipeline is mastered in time, and a reliable technical basis is provided for correctly analyzing and predicting the residual life of the pipeline.
At present, the commonly used creep measurement methods of a steam pipeline are mainly divided into two methods, the first method is a creep measurement point measurement method, namely a method for measuring and monitoring the diameter of a section by using a micrometer when the steam pipeline is shut down, the second method is a creep measurement mark measurement method, namely a method for measuring the perimeter of the section by winding a steel tape ruler made of invar alloy on the outer surface of the measured section of the pipeline, and the two methods adopt a length measuring tool for direct measurement. The creep measurement point measurement method has the following limitations: 1) two measuring points in the diameter direction are difficult to align during installation and welding, in addition, the measuring points are easy to fall off after long-term use, and once the measuring points fall off, the whole set of measuring points and the previous measuring data lose significance; 2) the micrometer used for measurement is heavy in weight, large in volume and inconvenient to operate, and a plurality of persons are required to work simultaneously during measurement; 3) the measuring result is greatly influenced by the ambient temperature, and in order to improve the measuring accuracy, the micrometer needs to be kept still beside the measured pipeline for at least 0.5 hour during measurement; 4) the creep direction of the pipeline is not balanced, and the maximum creep direction is not at the position of a measuring point possibly, so that a false measurement phenomenon is caused. Similar limitations exist for the creep measurement flag measurement method: 1) the steel tape ruler used for measurement is large, multiple persons are required to work in a matching mode, and the operation is inconvenient; 2) the environmental temperature has great influence on the measurement result, and the temperature of the steel tape ruler is consistent with the environmental temperature; 3) human errors can be generated in the measurement process by different measuring personnel. Because the creep deformation of the pipeline is very small, the accuracy of the two measurement methods is difficult to meet the requirement, the measurement data is often irregular, and even the situation that the diameter or circumference measurement value of the pipeline at the next time is smaller than that at the previous time occurs, so that the creep supervision is meaningless. Therefore, DL/T438-2016 metal technical supervision of thermal power plant eliminates the mandatory requirement for creep measurement, and the industrial standard DL/T441 creep supervision of high-temperature and high-pressure steam pipeline of thermal power plant for decades loses the original intention of the establishment.
In view of the limitations of the existing measurement means, there is a need to develop a convenient and accurate pipe creep measurement system and method, which will provide powerful technical support for the safety state assessment of high temperature pipes.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome above-mentioned prior art's shortcoming, designed a pipeline creep measurement system, this system can measure the creep of pipeline, and has convenient operation, the accurate and little characteristics of human error of testing result, can avoid the influence of temperature variation to creep measuring result by the at utmost.
In order to achieve the above object, the pipeline creep measurement system of the present invention comprises a pipeline to be measured, an ultrasonic module, a temperature module, an upper computer, a first ultrasonic transducer for generating an ultrasonic signal, a second ultrasonic transducer for converting the received ultrasonic signal into an electrical signal, and a temperature sensor for detecting the wall temperature of the pipeline to be measured;
the host computer is connected with ultrasonic module and temperature module, and the output of ultrasonic module is connected with first ultrasonic transducer, and second ultrasonic transducer is connected with the input of ultrasonic module, and temperature sensor is connected with the input of temperature module, and the ultrasonic wave that first ultrasonic transducer sent propagates to the second ultrasonic transducer behind the a week surface of pipeline that awaits measuring.
The upper computer comprises a processor, a memory and a display, wherein the memory and the display are connected with the processor, and the processor is connected with the ultrasonic module and the temperature module.
The first ultrasonic transducer and the second ultrasonic transducer are connected with the ultrasonic module through the shielding cable.
The utility model discloses following beneficial effect has:
pipeline creep measurement system when concrete operation, utilize ultrasonic ranging principle, control ultrasonic signal along pipeline circumference surface propagation a week, utilize ultrasonic signal and receive the time difference between the ultrasonic signal and calculate the present girth of pipeline, combine the pipeline current wall temperature to calculate the pipeline creep volume simultaneously, what need explain, the utility model discloses in introducing the creep calculation with ultrasonic sound velocity, the material linear expansion coefficient under the different temperatures, the biggest influence of avoiding the temperature variation to creep measurement result, convenient operation, the measurement result is accurate, and the artificial operation error is little.
Drawings
Fig. 1 is a schematic structural view of the present invention;
wherein, 1 is the pipeline to be measured, 2 is first ultrasonic transducer, 3 is the second ultrasonic transducer, 4 is the supersound module, 5 is temperature sensor, 6 is the temperature module, 7 is the host computer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, wherein the structure of fig. 1 is shown only for the part relevant to the present invention, and it is understood by those skilled in the art that the structure shown in the drawings does not constitute a limitation of the system, and may include more or less components than those shown, or some components may be combined, or different component arrangements may be adopted.
Referring to fig. 1, the pipe creep measurement system of the present invention includes a pipe 1 to be measured, an ultrasonic module 4, a temperature module 6, an upper computer 7, a first ultrasonic transducer 2 for generating ultrasonic signals, a second ultrasonic transducer 3 for converting the received ultrasonic signals into electrical signals, and a temperature sensor 5 for detecting the pipe wall temperature of the pipe 1 to be measured; host computer 7 is connected with ultrasonic module 4 and temperature module 6, and the output of ultrasonic module 4 is connected with first ultrasonic transducer 2, and second ultrasonic transducer 3 is connected with ultrasonic module 4's input, and temperature sensor 5 is connected with temperature module 6's input, and the ultrasonic wave that first ultrasonic transducer 2 sent propagates to second ultrasonic transducer 3 behind the week surface of pipeline 1 that awaits measuring.
The upper computer 7 comprises a processor, a memory and a display which are connected with the processor, wherein the processor is connected with the ultrasonic module 4 and the temperature module 6; the first ultrasonic transducer 2 and the second ultrasonic transducer 3 are connected with the ultrasonic module 4 through shielded cables.
The utility model discloses a concrete working process does:
1) inputting the material grade of the pipeline 1 to be tested and the linear expansion coefficient delta of the pipeline 1 material to be tested at different temperatures into the upper computer 7TThe sound velocity mu of ultrasonic waves of the material of the pipeline 1 to be measured at different temperaturesTAnd the distance L between the first ultrasonic transducer 2 and the second ultrasonic transducer 3S；
2) The temperature module 6 measures the temperature information T on the pipe wall of the pipeline 1 to be measured through the temperature sensor 5xAnd detecting the obtained temperature information T of the pipe wall of the pipeline 1 to be detectedxSending to an upper computer 7;
3) the upper computer 7 is used for measuring the temperature T of the pipe wall of the pipeline 1 according to the temperature informationxCalculating the linear expansion coefficient delta of the material of the pipeline 1 to be measured by a linear interpolation methodTx；
Wherein the linear expansion coefficient is generally discrete enumeration type data, i.e. only a specific temperature parameter T1、T2、T3…TnLinear expansion coefficient delta of lower materialT1、δT2、δT3……δTn；
Let T be1、T2、T3…Tn、Tn+1… is a temperature parameter containing a corresponding linear expansion coefficient inputted into the upper computer 7, and T1＜T2＜T3＜…＜Tn＜Tn+1< …, if the wall temperature T of the pipeline 1 to be measuredxExactly between TnAnd Tn+1In between, i.e. Tn≤Tx＜Tn+1At a temperature of TnThe linear expansion coefficient of the material is deltaTnAt a temperature of Tn+1The linear expansion coefficient of the material is deltaTn+1Then the temperature is TxLinear expansion coefficient of the material
When a linear expansion coefficient with higher precision is required, other interpolation methods such as a Newton interpolation method, a Lagrange interpolation method, an Hermite interpolation method and the like can be selected.
4) The upper computer 7 is used for measuring the temperature T of the pipe wall of the pipeline 1 according to the temperature informationxCalculating the ultrasonic sound velocity mu in the material of the pipeline 1 to be measured by a linear interpolation methodTx；
Wherein, the ultrasonic sound velocity is generally discrete enumeration type data, namely only a specific temperature parameter T1、T2、T3…TnSpeed of propagation of ultrasonic waves mu in the lower materialT1、μT2、μT3……μTn；
In particular, assume T1、T2、T3…Tn、Tn+1… is a temperature parameter containing the corresponding ultrasonic sound velocity inputted into the upper computer 7, and T1＜T2＜T3＜…＜Tn＜Tn+1< …, if the wall temperature T of the pipeline 1 to be measuredxExactly between TnAnd Tn+1In between, i.e. Tn≤Tx＜Tn+1At a temperature of TnAt an ultrasonic sound velocity of mu in the materialTnAt a temperature of Tn+1At an ultrasonic sound velocity of mu in the materialTn+1Then the temperature is TxVelocity of ultrasonic sound in material
5) The upper computer 7 controls the ultrasonic module 4 to generate a first electric signal and sends the first electric signal to the first ultrasonic transducer 2, the first ultrasonic transducer 2 converts the first electric signal into an ultrasonic signal, and the ultrasonic signalThe signal enters the second ultrasonic transducer 3 after passing through the surface of the pipeline 1 to be tested for a circle, and is converted into a second electric signal by the second ultrasonic transducer 3 and then sent to the ultrasonic module 4, and the upper computer 7 records the time t for the first ultrasonic transducer 2 to send out ultrasonic waves1And the time t when the second ultrasonic transducer 3 receives the ultrasonic wave2；
6) The upper computer 7 calculates the temperature of the pipe wall of the pipeline 1 to be measured as TxOriginal perimeter C ═ mu of cross section of pipeline 1 to be measuredTx*(t2-t1)+LS；
7) The upper computer 7 calculates the original perimeter C of the section when the temperature of the pipe wall of the pipeline 1 to be measured is converted to 0 DEG C0＝C*(1-Tx*δTx)＝[μTx*(t2-t1)+LS]*(1-Tx*δTx)；
8) After the pipeline 1 to be measured runs at high temperature for W time, the temperature of the pipe wall of the pipeline 1 to be measured, which is measured by the temperature sensor 5, is T'xCalculating the temperature T 'of the material of the pipeline 1 to be measured by a linear interpolation method'xLinear expansion coefficient of (delta)'TxAnd ultrasonic sound velocity of mu'TxSimultaneously, the upper computer 7 records the time t 'of the first ultrasonic transducer 2 sending ultrasonic waves'1And time t 'at which the second ultrasonic transducer 3 receives ultrasonic waves'2Calculating the perimeter C 'of the running section of the pipeline 1 to be measured when the pipe wall temperature of the pipeline 1 to be measured is converted to 0℃'0Comprises the following steps:
C′0＝[μ′Tx*(t′2-t′1)+LS]*(1-Tx′*δ′Tx)
9) the upper computer 7 calculates and outputs the relative creep quantity of the pipeline 1 to be measured after the high-temperature operation W time
It should be noted that the utility model provides an operation all forms through adder, subtracter, divider and multiplier integration, the utility model discloses a point lies in the integration of each device.
Claims (3)
1. The pipeline creep measurement system is characterized by comprising a pipeline (1) to be measured, an ultrasonic module (4), a temperature module (6), an upper computer (7), a first ultrasonic transducer (2) for generating ultrasonic signals, a second ultrasonic transducer (3) for converting the received ultrasonic signals into electric signals and a temperature sensor (5) for detecting the temperature of the pipe wall of the pipeline (1) to be measured;
host computer (7) are connected with ultrasonic module (4) and temperature module (6), and the output of ultrasonic module (4) is connected with first ultrasonic transducer (2), and second ultrasonic transducer (3) are connected with the input of ultrasonic module (4), and temperature sensor (5) are connected with the input of temperature module (6), and the ultrasonic wave that first ultrasonic transducer (2) sent propagates to in second ultrasonic transducer (3) behind the a week surface of pipeline (1) that awaits measuring.
2. The pipe creep measurement system according to claim 1, wherein the upper computer (7) comprises a processor and a memory and a display connected with the processor, wherein the processor is connected with the ultrasonic module (4) and the temperature module (6).
3. The pipe creep measurement system according to claim 1, wherein the first ultrasonic transducer (2) and the second ultrasonic transducer (3) are connected to the ultrasonic module (4) by shielded cables.
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| CN201921623616.9U CN210268565U (en) | 2019-09-26 | 2019-09-26 | Pipeline creep measurement system |
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| CN201921623616.9U CN210268565U (en) | 2019-09-26 | 2019-09-26 | Pipeline creep measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470254A (en) * | 2019-09-26 | 2019-11-19 | 西安热工研究院有限公司 | A kind of pipeline creep measurement system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470254A (en) * | 2019-09-26 | 2019-11-19 | 西安热工研究院有限公司 | A kind of pipeline creep measurement system and method |
| WO2021057288A1 (en) * | 2019-09-26 | 2021-04-01 | 西安热工研究院有限公司 | Pipe creep measurement system and method |
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