CN108845032B - Ultrasonic detection method for hydrogen damage of boiler water wall pipe - Google Patents
Ultrasonic detection method for hydrogen damage of boiler water wall pipe Download PDFInfo
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- CN108845032B CN108845032B CN201810521898.5A CN201810521898A CN108845032B CN 108845032 B CN108845032 B CN 108845032B CN 201810521898 A CN201810521898 A CN 201810521898A CN 108845032 B CN108845032 B CN 108845032B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
- G01B17/025—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness for measuring thickness of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2695—Bottles, containers
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Acoustics & Sound (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention belongs to the technical field of industrial detection, and particularly relates to an ultrasonic detection method for hydrogen damage of a boiler water wall pipe, which comprises the following specific steps: s1: taking down the measured object and processing the surface of the measured object; s2: mounting an object to be measured on an operation frame; s3: coating a couplant on a measuring surface of an object to be measured and installing an ultrasonic thickness gauge; s4: selecting parameters of the ultrasonic thickness gauge and measuring the thickness; s5: the measuring data is recorded and the measuring position is changed, and the scheme is simple in steps and convenient to measure in the operation process, and the portability of detection is improved by matching with the operation frame.
Description
Technical Field
The invention relates to the technical field of industrial detection, in particular to an ultrasonic detection method for hydrogen damage of a boiler water wall pipe.
Background
The water-cooled wall is the main heated part of the boiler, and is composed of a plurality of rows of steel pipes and distributed around the hearth of the boiler. The inside of the furnace is flowing water or steam, and the outside receives the heat of the flame of the boiler furnace. Mainly absorbs the radiation heat of high-temperature combustion products in the hearth, and the working medium rises in the hearth and is heated and evaporated.
Carbon in steel is replaced by hydrogen, so that pearlite in the steel disappears and decarburization occurs, methane is generated through reaction, the diffusion capacity of the methane in the steel is very low, the methane is easy to gather in original microscopic gaps of crystal boundaries, the methane quantity is increased, the molecular volume of the methane is larger than that of the hydrogen, huge pressure is generated among crystal grains after long-term use, cracks are finally generated, the light degree and the plasticity of the steel are reduced, and the classification of the hydrogen corrosion degree and the detection of the fracture risk possibly caused by the hydrogen corrosion cracks are particularly important.
Disclosure of Invention
The invention aims to provide an ultrasonic detection method for hydrogen damage of a boiler water wall tube, which aims to solve the problems that carbon in steel is replaced by hydrogen, so that pearlite in the steel disappears and decarburization occurs, huge pressure is generated among grains after long time, cracks are finally generated, and the mild degree and plasticity of the steel are reduced.
In order to achieve the purpose, the invention provides the following technical scheme: a boiler water wall pipe hydrogen damage ultrasonic detection method comprises the following specific detection method steps:
s1: taking down the measured object, and carrying out surface treatment on the measured object: the boiler water wall pipe is a water wall formed by connecting independent steel pipes which are connected in parallel, the independent steel pipes are taken down, the surfaces of the taken-down steel pipes are cleaned, and redundant welding spots are removed;
s2: mounting an object to be measured on a handling frame: placing the steel pipe cleaned in the step S1 on an operation rack: the operating frame comprises an upright post assembly, a sleeve assembly, a sliding clamp assembly, a supporting piece, a probe clamping plate and a supporting spring, wherein two ends of a steel pipe are respectively inserted into the sleeve assemblies at the upper side and the lower side;
s3: coating a coupling agent on a measuring surface of an object to be measured and installing an ultrasonic thickness gauge: the particle activity of the heated surface of the steel pipe is high, hydrogen damage usually occurs on the heated surface of the steel pipe, the steel pipe rotates in the sleeve assembly in the step S2, the heated surface of the steel pipe faces the left side, the steel pipe is fixed with the sleeve assembly through a bolt, the heated surface of the steel pipe is uniformly coated with a coupling agent, and a test probe of an ultrasonic thickness gauge is clamped in a groove on a probe clamping plate;
s4: selecting parameters of the ultrasonic thickness gauge and measuring the thickness: the method comprises the following steps that an ultrasonic thickness gauge is subjected to zero calibration, the measuring range of the ultrasonic thickness gauge is selected according to the approximate thickness range of a steel pipe, a probe clamping plate moves rightwards under the action of the elastic force of a supporting spring, a test probe of the ultrasonic thickness gauge moves rightwards, the test probe of the ultrasonic thickness gauge is tightly attached to one surface, coated with a coupling agent, of the steel pipe and coupled with the test probe of the ultrasonic thickness gauge, the ultrasonic thickness gauge displays good coupling and measures the thickness, a sliding strip and a sliding groove are matched between a sliding clamp assembly and an upright post assembly, rotation is avoided, and the ultrasonic thickness gauge is operated twice for measuring the thickness;
s5: recording measurement data and replacing measurement positions: and (4) recording the thickness values measured in the step (S4), sliding the slide card assembly from top to bottom, measuring the thickness of each position of the heating surface of the steel pipe from top to bottom by a test probe of the ultrasonic thickness gauge, selecting the value with the smaller thickness value in the two measurement results as a measurement value, displaying all the measurement values in a coordinate system and making a line graph, and determining whether the steel pipe is damaged or not through the made line graph.
Preferably, the upright post component selects the length of the corresponding upright post component according to the lengths of different steel pipes.
Preferably, in the step S4, the ultrasonic thickness gauge performs two thickness measurement operations, and the division planes of the two thickness measurement operations of the test probe of the ultrasonic thickness gauge are 90 °.
Preferably, the recording of the thickness value in step S5 is performed by PC, and the measurement value of the ultrasonic thickness gauge is obtained and displayed and manufactured by the PC.
Compared with the prior art, the invention has the beneficial effects that: this scheme is in operation process, and the step is simple, and it is convenient to measure, and the use of cooperation handling frame improves the portability that detects.
Drawings
FIG. 1 is a flow chart of the detection method of the present invention;
FIG. 2 is a schematic structural view of the handling frame of the present invention;
fig. 3 is a schematic view of an installation structure of the present invention.
In the figure: 1 column component, 2 sleeve components, 3 sliding clamp components, 4 supporting pieces, 5 supporting springs and 6 probe clamping plates.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a boiler water wall pipe hydrogen damage ultrasonic detection method comprises the following specific detection method steps:
s1: taking down the measured object, and carrying out surface treatment on the measured object: the water wall tube of the boiler is usually a water wall formed by connecting independent steel tubes which are connected in parallel, the independent steel tubes are taken down, the surface of the taken-down steel tubes is cleaned, redundant welding spots are removed, and the surface of the steel tubes is cleaned by a rust remover or a steel wire brush;
s2: mounting an object to be measured on a handling frame: placing the steel pipe cleaned in the step S1 on an operation rack: the operation frame comprises an upright post component 1, a sleeve component 2, a sliding clamp component 3, a support component 4, a probe clamping plate 6 and a support spring 5, wherein two ends of a steel pipe are respectively inserted into the sleeve components 2 at the upper side and the lower side;
s3: coating a coupling agent on a measuring surface of an object to be measured and installing an ultrasonic thickness gauge: the particle activity of the heated surface of the steel pipe is high, hydrogen damage usually occurs on the heated surface of the steel pipe, the steel pipe rotates in the sleeve assembly 2 in the step S2, the heated surface of the steel pipe faces to the left side, the steel pipe is fixed with the sleeve assembly 2 through bolts, the heated surface of the steel pipe is uniformly coated with a coupling agent, and a test probe of an ultrasonic thickness gauge is clamped in a groove on the probe clamping plate 6;
s4: selecting parameters of the ultrasonic thickness gauge and measuring the thickness: the method comprises the steps that an ultrasonic thickness gauge is subjected to zero calibration, the measuring range of the ultrasonic thickness gauge is selected according to the approximate thickness range of a steel pipe, a probe clamping plate 6 moves rightwards under the action of the elastic force of a supporting spring 5, a test probe of the ultrasonic thickness gauge moves rightwards, the test probe of the ultrasonic thickness gauge is tightly attached to one surface, coated with a coupling agent, of the steel pipe and coupled with the test probe of the ultrasonic thickness gauge, the ultrasonic thickness gauge displays good coupling and measures the thickness, a sliding strip and a sliding groove are matched between a sliding clamp assembly 3 and an upright post assembly 1, rotation is avoided, and the ultrasonic thickness gauge is subjected to thickness measurement twice;
s5: recording measurement data and replacing measurement positions: and (4) recording the thickness values measured in the step (S4), sliding the slide card assembly 3 from top to bottom, measuring the thickness of each position of the heating surface of the steel pipe from top to bottom by a test probe of the ultrasonic thickness gauge, selecting the value with the smaller thickness value in the two measurement results as a measurement value, displaying all the measurement values in a coordinate system and making a line graph, and determining whether the steel pipe is damaged or not through the made line graph.
The length of the corresponding upright post component 1 is selected by the upright post component 1 according to different lengths of steel pipes, the operation of the ultrasonic thickness gauge for measuring the thickness in the step S4 is carried out twice, the division surfaces of the test probe of the ultrasonic thickness gauge for measuring the thickness twice are 90 degrees, the thickness value is recorded by a PC end in the step S5, the measured value of the ultrasonic thickness gauge is obtained, and the measured value is displayed and manufactured by the PC end.
Examples
As shown in figure 3, the water wall tube is inserted between the upper and lower sets of sleeve pipe components 2, and the probe is clamped on the probe clamping plate 6 through screw fixation.
The ultrasonic thickness gauge of QU1600 is selected as a measuring instrument, the measuring range is (0.75-300) mm, an RS232 interface is connected, the connection with a PC end is convenient, the damage condition of the water wall tube is approximately the same, and only sampling detection is needed during detection.
Selecting a detection environment: the temperature is-20 ℃ to 50 ℃; there is no strong vibration, no magnetic field and no corrosive medium around the detection point.
Selecting parameters of the ultrasonic thickness gauge: when the thickness range is selected, firstly, the measurement is carried out by a micrometer, and the maximum value of the measurement range is selected as the value when the measurement value of the ultrasonic thickness gauge is more than 10% of the measurement value.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The ultrasonic detection method for hydrogen damage of the water wall pipe of the boiler is characterized by comprising the following steps of: the specific detection method of the ultrasonic detection method for the hydrogen damage of the water wall pipe of the boiler comprises the following steps:
s1: taking down the measured object, and carrying out surface treatment on the measured object: the boiler water wall pipe is a water wall formed by connecting independent steel pipes which are connected in parallel, the independent steel pipes are taken down, the surfaces of the taken-down steel pipes are cleaned, and redundant welding spots are removed;
s2: mounting an object to be measured on a handling frame: placing the steel pipe cleaned in the step S1 on an operation rack: the operating frame comprises an upright post assembly (1), a sleeve assembly (2), a sliding clamp assembly (3), a supporting piece (4), a probe clamping plate (6) and a supporting spring (5), wherein two ends of a steel pipe are respectively inserted into the sleeve assemblies (2) at the upper side and the lower side;
s3: coating a coupling agent on a measuring surface of an object to be measured and installing an ultrasonic thickness gauge: the particle activity of the heated surface of the steel pipe is high, hydrogen damage usually occurs on the heated surface of the steel pipe, the steel pipe rotates in the sleeve assembly (2) in the step S2, the heated surface of the steel pipe faces the left side, the steel pipe is fixed with the sleeve assembly (2) through bolts, the heated surface of the steel pipe is uniformly coated with a coupling agent, and a test probe of an ultrasonic thickness gauge is clamped in a groove on a probe clamping plate (6);
s4: selecting parameters of the ultrasonic thickness gauge and measuring the thickness: the ultrasonic thickness gauge is subjected to zero calibration, the measuring range of the ultrasonic thickness gauge is selected according to the approximate thickness range of the steel pipe, the probe clamping plate (6) moves rightwards under the action of the elastic force of the supporting spring (5), the testing probe of the ultrasonic thickness gauge moves rightwards, the testing probe of the ultrasonic thickness gauge is tightly attached to one surface, coated with the coupling agent, of the steel pipe and coupled with the testing probe of the ultrasonic thickness gauge, the ultrasonic thickness gauge displays good coupling and measures the thickness, the ultrasonic thickness gauge measures the thickness twice, the two-time measuring cutting surfaces of the testing probe of the ultrasonic thickness gauge for measuring the thickness twice are 90 degrees, the sliding clamp assembly (3) is matched with the upright post assembly (1) through a sliding strip and a sliding groove, rotation is avoided, and the ultrasonic thickness gauge is measured twice;
s5: recording measurement data and replacing measurement positions: and (4) recording the thickness value measured in the step (S4), sliding the slide card assembly (3) from top to bottom, measuring the thickness of each position of the heating surface of the steel pipe from top to bottom by a test probe of the ultrasonic thickness gauge, selecting the value with the smaller thickness value in the two measurement results as a measurement value, displaying all the measurement values in a coordinate system and making a line graph, and determining whether the steel pipe is damaged or not through the made line graph.
2. The ultrasonic detection method for the hydrogen damage of the boiler water wall pipe according to claim 1, characterized in that: the upright post component (1) selects the length of the corresponding upright post component (1) according to different lengths of the steel pipes.
3. The ultrasonic detection method for the hydrogen damage of the boiler water wall pipe according to claim 1, characterized in that: in the step S5, the recording mode of the thickness value is PC-side recording, the measurement value of the ultrasonic thickness gauge is obtained, and the measurement value is displayed and manufactured through the PC-side.
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| CN201810521898.5A CN108845032B (en) | 2018-05-28 | 2018-05-28 | Ultrasonic detection method for hydrogen damage of boiler water wall pipe |
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| CN201810521898.5A CN108845032B (en) | 2018-05-28 | 2018-05-28 | Ultrasonic detection method for hydrogen damage of boiler water wall pipe |
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| CN108845032B true CN108845032B (en) | 2021-02-12 |
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| CN110568076A (en) * | 2019-10-22 | 2019-12-13 | 张大练 | ultrasonic detection and diagnosis method for hydrogen damage of boiler water wall pipe |
| CN113176331B (en) * | 2021-03-29 | 2022-11-08 | 国能锅炉压力容器检验有限公司 | Method for detecting hydrogen damage of material through ultrasonic circumferential guided wave sound velocity |
| CN113176332B (en) * | 2021-03-29 | 2022-11-08 | 国能锅炉压力容器检验有限公司 | Method for detecting hydrogen damage of material through ultrasonic axial guided wave sound velocity |
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| JPH06347249A (en) * | 1993-06-04 | 1994-12-20 | Japan Energy Corp | Wall-thickness measuring apparatus |
| JP4686378B2 (en) * | 2006-02-27 | 2011-05-25 | 株式会社東芝 | Pipe inspection device |
| CN102830158B (en) * | 2012-08-29 | 2015-04-08 | 中国石油天然气集团公司 | Bend pipe damage scanning and detecting apparatus based on magnetic memory effect |
| CN102980539A (en) * | 2012-11-19 | 2013-03-20 | 河北省电力公司电力科学研究院 | Method for measuring thicknesses of metal layer and oxide layer of wall of boiler heating surface tube |
| CN104747886B (en) * | 2015-04-01 | 2016-09-28 | 中国神华能源股份有限公司 | Locating support for the cannot-harm-detection device |
| CN205384002U (en) * | 2016-02-16 | 2016-07-13 | 长沙天卓塑胶有限公司 | Pipeline wall thickness ultrasonic measurement device |
| CN106226400B (en) * | 2016-06-29 | 2019-04-30 | 中国石油大学(北京) | Shale anisotropy measurement device and measurement method |
| CN107831216B (en) * | 2017-10-23 | 2020-08-11 | 广元市特种设备监督检验所 | Boiler pipeline ultrasonic detection device |
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