CN114166157B - Intelligent quantitative method for oxide skin in tube according to ray intensity curve - Google Patents
Intelligent quantitative method for oxide skin in tube according to ray intensity curve Download PDFInfo
- Publication number
- CN114166157B CN114166157B CN202111487579.5A CN202111487579A CN114166157B CN 114166157 B CN114166157 B CN 114166157B CN 202111487579 A CN202111487579 A CN 202111487579A CN 114166157 B CN114166157 B CN 114166157B
- Authority
- CN
- China
- Prior art keywords
- curve
- tube
- ray
- pipe
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004445 quantitative analysis Methods 0.000 title description 2
- 238000001514 detection method Methods 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000012545 processing Methods 0.000 claims abstract description 24
- 239000007787 solid Substances 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000009825 accumulation Methods 0.000 claims abstract description 10
- 230000005251 gamma ray Effects 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 29
- 230000005855 radiation Effects 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 230000003993 interaction Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000011895 specific detection Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000011002 quantification Methods 0.000 claims description 2
- 230000003313 weakening effect Effects 0.000 claims 1
- 230000036541 health Effects 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 description 7
- 238000003384 imaging method Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000005865 ionizing radiation Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 208000019155 Radiation injury Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/288—X-rays; Gamma rays or other forms of ionising radiation
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention provides a method for intelligently quantifying the height of accumulated oxide scale in a detected pipe according to the shape of an oxide scale accumulation detection ray intensity curve, which is used for a miniature gamma-ray source or a miniature x-ray source automatic detection device. The whole ray intensity curve received by the receiver of the detection device is processed by a data processing system and is divided into three sections of smooth curves, wherein two obvious turning points exist; when oxide skin or other solid foreign matters exist in the pipe, the smooth curve of the middle section breaks the smooth state, and an inflection point appears, wherein the position of the inflection point is the height of accumulated oxide skin or solid foreign matters in the pipe. The method does not need to process films and images, has high detection speed, good economy and less influence on the health of staff, and has reliable detection results as long as equipment is reliable.
Description
Technical Field
The invention relates to the field of detection of the interior of a heated pipe of a thermal power generation boiler, in particular to a method for intelligently quantifying according to the shape of a curve of the intensity of radiation detected by oxide scale accumulation.
Background
The current thermal power generation boiler is developed to a high-parameter supercritical boiler, the high-temperature steam oxidation phenomenon in a high-temperature heating surface tube of the boiler becomes necessary due to the higher temperature and pressure, and oxide skin generated by steam oxidation can be peeled off and accumulated in a U-shaped bent tube under a certain condition, so that the bent tube is blocked, and the safe operation of a thermal power generation unit is seriously threatened. To solve this problem, the amount of scale deposited inside the boiler tubes is detected in time. When the scale is accumulated in the pipe to the extent that the operation safety of the boiler is affected, the pipe is cut and the scale accumulated in the pipe is cleaned.
The conventional detection methods include various methods such as radiation detection, electromagnetic detection and ultrasonic detection, and each method has advantages and disadvantages. The radiographic inspection has various radiographic inspection, real-time imaging, DR inspection, CR inspection and the like, and relates to an imaging or electronic imaging mode, the inspection process is complex, the labor intensity is high, the process method and equipment are complex, the electronic imaging problem needs to be solved, the inspection speed is low, the influence of ionizing radiation on the health of staff is large, and the judgment precision of the inspection result is not high.
Disclosure of Invention
In order to solve the problems, the invention provides a method for intelligently quantifying the shape of the curve of the intensity of the detection rays according to the scale accumulation by utilizing a miniature gamma-ray source or a miniature x-ray source automatic detection device, which does not need to process films and images, has high detection speed relatively, good economy, less influence on the health of staff, and reliable detection results as long as equipment is reliable.
The method for intelligently quantifying the oxide skin in the tube according to the ray intensity curve is characterized by comprising the following steps of:
(1) According to the theory of interaction of rays and substances, a ray intensity curve of rays passing through a tube is calculated according to the specification and the material of a tube of a high-temperature heating surface of a common boiler;
(2) Presetting detection process parameters and detection programs;
(3) Testing to obtain a detection curve and check data of the detected pipe;
(4) And (3) performing test detection by using a sample tube, and checking the accuracy and reliability of a detection result according to the actual stacking height of oxide skin or foreign matters in the tube.
Preferably, in the step (1), the radiation intensity curve obtained by calculation is a theoretical curve; the theoretical curve forms of the radiation intensity of the pipes with different specifications and materials are the same, the theoretical curve forms are three sections of curves, and the maximum value I of the intensity is obtained at the position without the pipe 0 The shape of the device is a straight line; the curvature of each of the three curved sections is different when the specifications and materials of the pipes are different.
Preferably, in the step (2), the traveling speed v of the automatic detection system is set; setting the intensity of the rays emitted by the ray emitter to be I when the rays are not directly irradiated to the receiver through other solid or liquid substances 0 The method comprises the steps of carrying out a first treatment on the surface of the The intensity of the rays received by the receiver after passing through the pipe wall is Ip, and an Ip graph is formed in the process that the ray emitter and the receiver synchronously pass through the detected pipe; the sensitivity of the ray receiver is adjusted according to the detection test condition or the emission intensity of the ray emission device is adjusted according to the sensitivity of the receiver.
Preferably, the Ip curve has a fixed shape, and in the fixed shape, the instrument system can ignore the Ip value according to the curve shape, calculate and confirm that no foreign matter exists in the pipe; when oxide skin or foreign matter is accumulated in the pipe, the oxide skin or the foreign matter attenuates the ray, a certain intensity attenuation area is arranged on the Ip curve, and the Ip curve changes.
Preferably, in the step (3), according to a specific detection object, testing and obtaining a ray intensity curve of the pipe with corresponding specification, size and material; in the test, according to the set detected travelling speed v, timing is performed according to the curve sampling point, and the error between the actual travelling speed and the set value is verified according to the data of the actual wall thickness, the inner diameter and the outer diameter of the pipe, so that the error reaches the minimum value.
Preferably, the specific way of acquiring the ray intensity curve is as follows: the system records that the sampling frequency of the intensity value Ip is 50-100 times/second, the detection device and the pipe move at a constant speed with the relative speed of v, and the system obtains the curve of the ray intensity value Ip. Depending on the instrument configuration, a suitable sampling frequency is taken. The frequency is too high, the operation speed of the instrument is slow, and the detection speed is slow.
Preferably, the specific way of adjusting the error is:
setting O as the starting positions of the ray emitter and the ray receiver, and A, B, C as the positions to which the ray emitter and the ray receiver respectively run;
counting from point 0 and denoted t 0 The method comprises the steps of carrying out a first treatment on the surface of the The time taken for the rows of the radiation emitter and receiver to reach point a is noted as t A The time taken to travel to point B is noted as t B The time taken to travel to point C is noted as t C ；
The actual tube has an outer diameter D and the data measured by the test is 0c=v×t C ；
The actual internal diameter of the tube was Di, and the experimental measurement data ab=v× (t B -t A )；
The actual wall thickness of the tube is δ, the experimental measurement data 0a=bc=v×t A ＝v×(t C -t B )。
The calculation formula for error adjustment is as follows, wherein the set value v of the detected travelling speed is v' according to the error adjustment of the test data and the actual pipe size data:
v′＝v×D÷(0C)＝v×Di÷(AB)＝v×δ÷(0A)＝v×δ÷(BC)
preferably, in the step (4), the method for determining the scale or foreign matter accumulation height is as follows: when no oxide skin or foreign matter or water exists in the pipe, the whole curve is divided into three sections of smooth curves, wherein two obvious turning points exist; when oxide skin or foreign matter exists in the pipe, the smooth curve of the middle section breaks the smooth state, and an inflection point h appears, wherein the inflection point h is the position corresponding to the height of the accumulated oxide skin or solid foreign matter; the oxide scale accumulation or foreign matter height is recorded as h, and the system calculation formula is as follows:
h＝v′×(t h -t A )
in the formula, h is the stacking height of oxide scale in the tube;
v' —the travel speed set by the instrument after error calibration;
t h -the instrument starts timing from point 0 to point h;
t A -the instrument starts timing from point 0 to point a.
Preferably, the mass equivalent of the oxide scale deposited in the pipe is converted by converting the size or the proportion of the occupied section of the pipe according to the relation between the stacking height of the oxide scale or the solid foreign matters and the occupied section of the pipe or by experimental comparison data.
Preferably, a miniature gamma-ray source or miniature x-ray source is adopted to automatically detect the device and a data processing system; the receiver transmits the received ray intensity to the data processing system, the data processing system comprises a program setting module, a data receiving module, an analysis module and a processing module, the advancing speed v is the synchronous uniform advancing speed when the ray emitter and the receiver which are preset in the data processing system detect, the program setting module presets the processing program for processing the Ip curve obtained by the test detection and the data checking formula, and the test values of A, B, C and h points are input into the data processing system to calibrate the detection device.
Compared with the prior art, the invention has the advantages that:
according to the detection of the existing miniature gamma-ray source or miniature x-ray source automatic detection device, a program is set in the data processing system in advance to perform data processing, and the oxide scale and foreign matter accumulation height can be obtained through the positions of three curve inflection points, so that the method is simple and feasible;
the method does not need to process films and images, has high detection speed, good economy and less influence on the health of staff, and has reliable detection results as long as equipment is reliable.
Drawings
FIG. 1 is a comparison of a method for intelligent quantification of the shape of a ray intensity curve based on scale buildup detection using the present invention;
wherein, the left side of the a graph is a schematic diagram of the relative positions of a ray emitter and a ray receiver, and the right side is an Ip curve when no oxide scale or solid foreign matters exist in the tube;
the left side of the graph b is a schematic diagram of the relative positions of the ray emitter and the ray receiver in the detection process, and the right side is an Ip curve when oxide scale or solid foreign matters exist in the tube.
In the figure, 1-tube wall; a 2-emitter; a 3-receiver; 4-ray intensity curve
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; some well known structures in the drawings and descriptions thereof may be omitted to those skilled in the art; the terms "upper," "lower," "front," "rear," "radial," "transverse," "longitudinal," "horizontal," "parallel," and the like refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
In the present invention, the terms "mounted," "connected," "secured," and the like are to be construed broadly, unless otherwise specifically indicated and defined. For example, the two parts can be fixedly connected, detachably connected or integrated; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or by communication between two elements or interaction between the two elements, unless explicitly defined otherwise, the meaning of the terms in this disclosure will be understood to those of ordinary skill in the art.
As shown in fig. 1, a method for intelligently quantifying oxide scale in a tube according to a ray intensity curve is characterized in that the method comprises the following steps:
(1) According to the theory of interaction between the rays and the substance, calculating an obtained ray intensity curve as a theoretical curve; the theoretical curve forms of the radiation intensity of the pipes with different specifications and materials are the same, the theoretical curve forms are three sections of curves, and the maximum value I of the intensity is obtained at the position without the pipe 0 The shape of the device is a straight line; the curvature of each of the three curved sections is different when the specifications and materials of the pipes are different.
(2) Presetting detection process parameters and detection programs: setting the travelling speed v of an automatic detection system; the radiation emitted by the radiation emitter 2 is directly irradiated on the receiver 3 without other solid or liquid substances, and the intensity of the radiation received by the receiver 3 is set as I 0 The method comprises the steps of carrying out a first treatment on the surface of the The intensity of the rays received by the receiver 3 after passing through the pipe wall 1 is Ip, and an Ip curve 4 is formed in the process that the ray emitter and the receiver synchronously pass through the detected pipe; the sensitivity of the radiation receiver 3 is adjusted according to the detection test situation or the emission intensity of the radiation emitting device is adjusted according to the sensitivity of the receiver.
The Ip curve 4 presents a fixed shape, under which the instrument system can ignore the Ip value according to the curve shape, calculate and confirm that no foreign matter exists inside the tube; when oxide skin or foreign matter is accumulated in the pipe, the oxide skin or the foreign matter attenuates the ray, a certain intensity attenuation area is arranged on the Ip curve, and the Ip curve changes.
(3) Testing to obtain a detection curve and verification data of the detected pipe: according to a specific detection object, testing and obtaining a ray intensity curve of a pipe with corresponding specification, size and material; in the test, according to the set detected travelling speed v, timing is carried out according to the curve sampling point, and the errors of the actual travelling speed and the set value are verified according to the actual wall thickness, the outer diameter and the inner diameter of the pipe, so that the errors reach the minimum value.
The specific mode for acquiring the ray intensity curve is as follows: the system records that the sampling frequency of the intensity value Ip is 50-100 times/second, the detection device and the pipe move at a constant speed with the relative speed of v, and the system obtains a ray intensity value Ip curve 4. Depending on the instrument configuration, a suitable sampling frequency is taken. The frequency is too high, the operation speed of the instrument is slow, and the detection speed is slow.
The specific way of adjusting the error is:
setting O as the starting positions of the ray emitter and the ray receiver, and A, B, C as the positions to which the ray emitter and the ray receiver respectively run;
counting from point 0 and denoted t 0 The method comprises the steps of carrying out a first treatment on the surface of the The time taken for the rows of the radiation emitter and receiver to reach point a is noted as t A The time taken to travel to point B is noted as t B The time taken to travel to point C is noted as t C ；
The actual tube has an outer diameter D and the data measured by the test is 0c=v×t C ；
The actual internal diameter of the tube was Di, and the experimental measurement data ab=v× (t B -t A )；
The actual wall thickness of the tube is δ, the experimental measurement data 0a=bc=v×t A ＝v×(t C -t B )。
The calculation formula for error adjustment is as follows, wherein the set value v of the detected travelling speed is v' according to the error adjustment of the test data and the actual pipe size data:
v′＝v×D÷(0C)＝v×Di÷(AB)＝v×δ÷(0A)＝v×δ÷(BC)
(4) And (3) performing test detection by using a sample tube, and checking the accuracy and reliability of a detection result according to the actual stacking height of oxide skin or foreign matters in the tube.
As shown in a of fig. 1, the method for determining the scale or foreign matter accumulation height is as follows: when no oxide scale or foreign matter or water exists in the pipe, the whole Ip curve 4 is divided into three sections of smooth curves, wherein two obvious turning points exist; as shown in a b diagram in fig. 1, when oxide scale or foreign matter exists in the pipe, the smooth state of the middle section smooth curve can be broken, and an inflection point h appears in the Ip curve 4, wherein the inflection point h is the position corresponding to the height of accumulated oxide scale or solid foreign matter; the oxide scale accumulation or foreign matter height is recorded as h, and the system calculation formula is as follows:
h＝v′×(t h -t A )
in the formula, h is the stacking height of oxide scale in the tube;
v' —the travel speed set by the instrument after error calibration;
t h -the instrument starts timing from point 0 to point h;
t A -the instrument starts timing from point 0 to point a.
According to the relation between the stacking height of oxide skin or solid foreign matters and the inner section of the pipe, the size or the proportion of the inner section of the pipe is calculated, or the mass equivalent of the stacked oxide skin in the pipe is converted through experimental comparison data.
A miniature gamma-ray source or a miniature x-ray source is adopted to automatically detect the device and a data processing system; the receiver transmits the received ray intensity to the data processing system, the data processing system comprises a program setting module, a data receiving module, an analysis module and a processing module, the advancing speed v is the synchronous uniform advancing speed when the ray emitter and the receiver which are preset in the data processing system detect, the program setting module presets the processing program for processing the Ip curve obtained by the test detection and the data checking formula, and the test values of A, B, C and h points are input into the data processing system to calibrate the detection device.
During detection, the ray emitter 2 and the receiver 3 stand on two sides of the pipe to be detected, the clear distance between the ray emitter and the receiver is larger than the outer diameter of the pipe to be detected, the pipe is not touched, and the ray emitter and the receiver synchronously travel at a constant speed during the test.
Example 1
The detection is that HG-1913/25.4-YM3 model boiler high temperature superheater tube. The boiler is a supercritical parameter, the outlet temperature of the final superheater is 571 ℃, the steam pressure is 25.4MPa, the production is started in 10 months in 2008, and the running time is accumulated for 72876.5 hours; the specification of the superheater tube is phi 50 multiplied by 8mm, and the brand of austenitic steel used is SA213-TP347H.
The detection instrument used was CH-Ir6. The detection steps are as follows:
1. mounting a tool to a boiler tube panel to be inspected
And (3) correctly installing the tool according to the conditions of the site of the boiler pipe to be detected, the maximum height position of oxide scale deposition in the boiler pipe to be detected and the like, so that the clear distance between the radiation emitter and the receiver is about 60mm, installing the radiation emitter and the receiver, and connecting the control circuit and the receiver to receive the data circuit.
2. Personnel withdraw the frock mounted position and reach the safe position of instrument control department, ensure that personnel do not receive ionizing radiation injury.
3. And checking the instrument. The control system is turned on to move the radiation emitter and receiver to the position below the tube so that the radiation received by the receiver is not interfered by the tube. After the computer display is stable, opening a closed window of the miniature ray source, and checking the ray intensity I received by a receiver displayed in the display 0 Judging I according to experience or according to distance, activity of ray source and the like 0 Whether the value is normal.
4. Detection of
The ray emitter and the ray receiver are enabled to ascend synchronously, all bent pipes in the detected pipe screen are detected, the instrument records detection data, judgment of detection results is automatically completed, and a detection curve is displayed for manual check.
Example two
The detection is that the B & WB-2082/28.0-M model boiler is a high temperature superheater tube. The boiler is ultra-supercritical, the outlet temperature of the superheater is 605 ℃, the steam pressure is 28.0MPa, the production is started in 2013 1 month, and the accumulated running time is 43625.7 hours; the specification of the superheater tube is phi 41.3 multiplied by 7mm, and the brand of austenitic steel used is Super304HSB.
The same instrument system as in example 1 was used.
The instrument was checked and tested as in example 1.
Example III
The final stage reheater tube of the DG3000/27.46-II1 boiler was tested. The boiler is ultra-supercritical, the outlet temperature of the final-stage reheater is 603 ℃, the pressure is 5.94MPa, the production is started in 12 months in 2008, and the running time is accumulated for 86736.5 hours; the reheater tube has a specification of phi 57 x 4mm and a steel grade of T92.
The same instrument system as in example 1 was used.
The instrument was checked and tested as in example 1.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that the invention is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the invention.
Claims (4)
1. The method for intelligently quantifying the oxide skin in the tube according to the ray intensity curve is characterized by comprising the following steps of:
(1) According to the theory of interaction of rays and substances, a ray intensity curve of rays passing through a tube is calculated according to the specification and the material of a tube of a high-temperature heating surface of a common boiler;
(2) Presetting detection process parameters and detection programs;
(3) Testing to obtain a detection curve and check data of the detected pipe;
(4) Performing test detection by using a sample tube, and checking the accuracy and reliability of a detection result according to the actual stacking height of oxide skin or foreign matters in the tube;
in the step (1), the radiation intensity curve obtained by calculation is a theoretical curve; the theoretical curve forms of the radiation intensity of the pipes with different specifications and materials are the same, the theoretical curve forms are three sections of curves, and the maximum value I of the intensity is obtained at the position without the pipe 0 The shape of the device is a straight line; the curvature of each of the three sections of the curve is different when the specifications and the materials of the pipes are different;
in the step (2), setting the traveling speed v of the automatic detection system; setting the radiation emitted by the radiation emitter to be not directly irradiated by other solid or liquid substancesThe intensity of the rays which are transmitted to the receiver and received by the receiver is I 0 The method comprises the steps of carrying out a first treatment on the surface of the The intensity of the ray received by the receiver after the ray passes through the pipe wall is I p During the synchronous passing of the radiation emitter and the receiver through the detected tube, I is formed p A curve; the sensitivity of the ray receiver is adjusted according to the detection test condition or the emission intensity of the ray emission device is adjusted according to the sensitivity of the receiver;
in the step (3), testing and obtaining the ray intensity curve of the pipe with corresponding specification, size and material according to a specific detection object; i p The curve assumes a fixed shape in which the instrument system can ignore I according to the curve shape p Calculating the value and confirming that no foreign matter exists in the pipe; when oxide skin or foreign matter is deposited in the tube, the oxide skin or foreign matter attenuates the radiation, I p The curve has a certain intensity weakening area, I p The curve changes;
during the test, according to the set detected travelling speed v, timing according to the curve sampling point, and according to the actual wall thickness of the pipe, the data of the inner diameter and the outer diameter of the pipe, verifying the error between the actual travelling speed and a set value, and adjusting to enable the error to reach the minimum value; the specific way of adjusting the error is:
setting O as the starting positions of the ray emitter and the ray receiver, and A, B, C as the positions to which the ray emitter and the ray receiver respectively run;
counting from point 0 and denoted t 0 The method comprises the steps of carrying out a first treatment on the surface of the The time taken for the rows of the radiation emitter and receiver to reach point a is noted as t A The time taken to travel to point B is noted as t B The time taken to travel to point C is noted as t C ；
The actual tube has an outer diameter D and the data measured by the test is 0c=v×t C ；
The actual inner diameter of the tube is D i Experimental measurement data ab=v× (t B -t A )；
The actual wall thickness of the tube is δ, the experimental measurement data 0a=bc=v×t A ＝v×(t C -t B )；
The calculation formula for error adjustment is as follows, wherein the set value v of the detected travelling speed is v' according to the error adjustment of the test data and the actual pipe size data:
v′＝v×D÷(0C)＝v×D i ÷(AB)＝v×δ÷(0A)＝v×δ÷(BC)；
in the step (4), the method for determining the scale or foreign matter accumulation height is as follows: when no oxide skin or foreign matter or water exists in the pipe, the whole curve is divided into three sections of smooth curves, wherein two obvious turning points exist; when oxide skin or foreign matter exists in the pipe, the smooth curve of the middle section breaks the smooth state, and an inflection point h appears, wherein the inflection point h is the position corresponding to the height of the accumulated oxide skin or solid foreign matter; the oxide scale accumulation or foreign matter height is recorded as h, and the system calculation formula is as follows:
h＝v′×(t h -t A )
in the formula, h is the stacking height of oxide scale in the tube;
v' —the travel speed set by the instrument after error calibration;
t h -the instrument starts timing from point 0 to point h;
t A -the instrument starts timing from point 0 to point a.
2. The method for intelligently quantifying oxide scale in a tube according to the ray intensity curve according to claim 1, wherein the specific way of obtaining the ray intensity curve is as follows: system recording intensity value I p The sampling point frequency is 50-100 times/second, the detection device and the tube move at constant speed with v relative speed, and the system obtains the ray intensity value I p Is a curve of (2).
3. The method for intelligently quantifying the oxide scale in the tube according to the ray intensity curve according to claim 1, wherein the mass equivalent of the oxide scale piled in the tube is converted according to the relation between the piling height of the oxide scale or solid foreign matters and the inner section of the tube, or the size or the proportion of the inner section of the tube is calculated, or the test comparison data are used for converting the mass equivalent of the oxide scale piled in the tube.
4. A method for the intelligent quantification of scale in a tube according to a ray intensity curve according to any one of claims 1-3The method is characterized in that a miniature gamma-ray source or a miniature x-ray source is adopted to automatically detect the device and a data processing system; the receiver transmits the received ray intensity to a data processing system, the data processing system comprises a program setting module, a data receiving module, an analysis module and a processing module, the advancing speed v is the synchronous uniform advancing speed when the ray emitter and the receiver which are preset in the data processing system detect, and the program setting module presets I obtained by processing test detection p The test values of the curve processing program, the data checking formula, A, B, C and the h point are input into a data processing system to calibrate the detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111487579.5A CN114166157B (en) | 2021-12-08 | 2021-12-08 | Intelligent quantitative method for oxide skin in tube according to ray intensity curve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111487579.5A CN114166157B (en) | 2021-12-08 | 2021-12-08 | Intelligent quantitative method for oxide skin in tube according to ray intensity curve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114166157A CN114166157A (en) | 2022-03-11 |
| CN114166157B true CN114166157B (en) | 2023-10-20 |
Family
ID=80484089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111487579.5A Active CN114166157B (en) | 2021-12-08 | 2021-12-08 | Intelligent quantitative method for oxide skin in tube according to ray intensity curve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114166157B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3835323A (en) * | 1972-08-07 | 1974-09-10 | J Kahil | Radiation inspection apparatus with adjustable shutter for inspecting different sizes of tubular goods |
| CN1376909A (en) * | 2001-03-23 | 2002-10-30 | 何凤歧 | Gamma-ray detecting method and device for in-duty pipeline network |
| CN2569114Y (en) * | 2002-09-23 | 2003-08-27 | 中国铝业股份有限公司 | Gamma gage on-line measurer of counter tube guard seal |
| JP2005351687A (en) * | 2004-06-09 | 2005-12-22 | Jfe Steel Kk | Evaluation method for press workability of zinc base-plated steel iron |
| JP2006090892A (en) * | 2004-09-24 | 2006-04-06 | Futec Inc | Apparatus and method for measuring coated sheet, using x-ray transmission method |
| CN101216164A (en) * | 2007-12-29 | 2008-07-09 | 西安交通大学 | Water-cooled wall on-line safe evaluation method |
| CN101750011A (en) * | 2010-01-19 | 2010-06-23 | 广东拓奇电力技术发展有限公司 | Scale detecting instrument in tube on high-temperature heating surface of supercritical boiler and detection method |
| CN101769881A (en) * | 2010-01-19 | 2010-07-07 | 华南理工大学 | Gamma-ray source-based ray nondestructive testing device for foreign body inside small-diameter metal tube |
| CN101839746A (en) * | 2009-10-25 | 2010-09-22 | 梁法春 | Method and device for measuring accumulated liquid of natural gas pipeline |
| CN102735313A (en) * | 2012-06-19 | 2012-10-17 | 郭云昌 | Method for determining middle material level curve of continuous passive nuclear material level gage |
| CN105403288A (en) * | 2015-12-10 | 2016-03-16 | 无锡拓能自动化科技有限公司 | Gas pipeline effusion monitoring system and monitoring method |
| CN107478147A (en) * | 2017-08-01 | 2017-12-15 | 湘潭大学 | Come off oxide skin ulking thickness pulse eddy current detection method and device in a kind of austenite boiler tube |
| CN111189972A (en) * | 2018-11-14 | 2020-05-22 | 国电锅炉压力容器检验有限公司 | Method for measuring equivalent weight of accumulated height of oxide skin in boiler tube |
| CN111505031A (en) * | 2020-04-14 | 2020-08-07 | 国网河南省电力公司电力科学研究院 | Three-dimensional visual imaging detection method for internal structure of gas insulated electrical equipment |
-
2021
- 2021-12-08 CN CN202111487579.5A patent/CN114166157B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3835323A (en) * | 1972-08-07 | 1974-09-10 | J Kahil | Radiation inspection apparatus with adjustable shutter for inspecting different sizes of tubular goods |
| CN1376909A (en) * | 2001-03-23 | 2002-10-30 | 何凤歧 | Gamma-ray detecting method and device for in-duty pipeline network |
| CN2569114Y (en) * | 2002-09-23 | 2003-08-27 | 中国铝业股份有限公司 | Gamma gage on-line measurer of counter tube guard seal |
| JP2005351687A (en) * | 2004-06-09 | 2005-12-22 | Jfe Steel Kk | Evaluation method for press workability of zinc base-plated steel iron |
| JP2006090892A (en) * | 2004-09-24 | 2006-04-06 | Futec Inc | Apparatus and method for measuring coated sheet, using x-ray transmission method |
| CN101216164A (en) * | 2007-12-29 | 2008-07-09 | 西安交通大学 | Water-cooled wall on-line safe evaluation method |
| CN101839746A (en) * | 2009-10-25 | 2010-09-22 | 梁法春 | Method and device for measuring accumulated liquid of natural gas pipeline |
| CN101750011A (en) * | 2010-01-19 | 2010-06-23 | 广东拓奇电力技术发展有限公司 | Scale detecting instrument in tube on high-temperature heating surface of supercritical boiler and detection method |
| CN101769881A (en) * | 2010-01-19 | 2010-07-07 | 华南理工大学 | Gamma-ray source-based ray nondestructive testing device for foreign body inside small-diameter metal tube |
| CN102735313A (en) * | 2012-06-19 | 2012-10-17 | 郭云昌 | Method for determining middle material level curve of continuous passive nuclear material level gage |
| CN105403288A (en) * | 2015-12-10 | 2016-03-16 | 无锡拓能自动化科技有限公司 | Gas pipeline effusion monitoring system and monitoring method |
| CN107478147A (en) * | 2017-08-01 | 2017-12-15 | 湘潭大学 | Come off oxide skin ulking thickness pulse eddy current detection method and device in a kind of austenite boiler tube |
| CN111189972A (en) * | 2018-11-14 | 2020-05-22 | 国电锅炉压力容器检验有限公司 | Method for measuring equivalent weight of accumulated height of oxide skin in boiler tube |
| CN111505031A (en) * | 2020-04-14 | 2020-08-07 | 国网河南省电力公司电力科学研究院 | Three-dimensional visual imaging detection method for internal structure of gas insulated electrical equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114166157A (en) | 2022-03-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4330835A (en) | Method and apparatus for determining the internal dimension of hollow bodies | |
| EP2233921A1 (en) | A method and system for transducer element fault detection for phased array ultrasonic instruments | |
| CN109387567A (en) | One kind being based on the modified increasing material manufacturing laser ultrasonic detection data processing method of velocity of wave | |
| CN108152367B (en) | Low-frequency array eddy current positioning quantitative analysis method | |
| CN106198738A (en) | A kind of localization method of rayleigh waves inspection small diameter tube longitudinal defect | |
| CN103543208B (en) | Method for reducing near surface blind region in TOFD (Time of Flight Diffraction) detection based on spectral analysis principle | |
| EP0242425B1 (en) | Method for evaluating residual fatigue life of mechanical parts | |
| CN114589396B (en) | On-line monitoring method of ultrasonic welding machine | |
| JPS6239379B2 (en) | ||
| CN114166157B (en) | Intelligent quantitative method for oxide skin in tube according to ray intensity curve | |
| US10416123B2 (en) | Flaw detection sensitivity adjustment method and abnormality diagnosis method for ultrasonic probe | |
| JPH02120659A (en) | Non-destructive dimensions and defect inspection for thin tube weld part | |
| WO2011046148A1 (en) | Non-destructive examination method and device | |
| KR20210059924A (en) | Measuring system and method of metal material property | |
| CN110353714A (en) | CT equipment method for detecting abnormality, device, equipment and storage medium | |
| EP2622362B1 (en) | Nondestructive inspection method for a heat exchanger employing adaptive noise thresholding | |
| CN110988138B (en) | Weld assembly quality detection device and method | |
| JPS5847252A (en) | Detecting method for flaw in welded part of reaction tube by ultrasonic flaw detection | |
| KR102308070B1 (en) | Ultrasonic inspection system of fuel tube for pressurized water reactor | |
| CN201444148U (en) | Inside burr automatic monitoring device in flaw detecting system | |
| CN115802907A (en) | Oriented tobacco product | |
| JP2594835B2 (en) | A method of extracting the thinned part of a double-walled pipe made of dissimilar materials and measuring the thickness of the thinned part | |
| JP6364280B2 (en) | Evaluation method of thread defect | |
| JP5750066B2 (en) | Non-destructive inspection method using guided waves | |
| JP7381884B2 (en) | How to inspect the inner surface of a pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |