CN103529127A - Assessment method of hydrogen damage to water wall tube of boiler - Google Patents
Assessment method of hydrogen damage to water wall tube of boiler Download PDFInfo
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- CN103529127A CN103529127A CN201310454706.0A CN201310454706A CN103529127A CN 103529127 A CN103529127 A CN 103529127A CN 201310454706 A CN201310454706 A CN 201310454706A CN 103529127 A CN103529127 A CN 103529127A
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Abstract
The invention discloses an assessment method of hydrogen damage to a water wall tube of a boiler. The method comprises the steps as follows: 1), a sampling tube in the water wall tube of the boiler is assessed; 2), a test object is selected; 3), a supersonic detector is equipped, 4), the test object is subjected to supersonic detection; 5), according to the step 4), a product logarithmic function and a sonic path distance graph are established; 6); a supersonic attenuation coefficient a0 of the test object is obtained; 7), supersonic detection of the sampling tube is performed; 8), according to the step 7), a product logarithmic function and a sonic path distance graph are established; 9), a supersonic attenuation coefficient a1 of the sampling tube is obtained; 10), a hydrogen damage degree factor value delta of the water wall tube of the boiler is obtained; and 11), an assessment conclusion of the hydrogen damage to the water wall tube of the boiler is drawn. According to the method, special processing of the tested material is not required, the process is simple, the operation is convenient and rapid, the conclusion is accurate, the requirement for the detection environment is less strict, and the efficiency is substantially improved.
Description
Technical field
The invention belongs to technical field of nondestructive testing, be specifically related to a kind of appraisal procedure of boiler water-wall tube hydrogen damage, be applicable to carrying out classification and its risk of breakage is made to assessment metal material hydrogen damage.
Background technology
Boiler water-wall tube is in operation and easily produces the corrosion under sediment, and hydrogen-type corrosion crackle also easily occurs, and the booster fault seriously frequently causing because of hydrogen-type corrosion under sediment once repeatedly occurred in generating plant both at home and abroad.At present metal material hydrogen damage ultrasonic detection method is had to velocity rate method, damped method and backscattering method.But these methods are not all carried out Accurate Classification to the degree of hydrogen damage, do not provide a hydrogen damage risk assessment yet.Therefore,, for the feature of hydrogen-type corrosion crackle, hydrogen-type corrosion degree is carried out to classification and hydrogen-type corrosion crackle and may cause risk of breakage to assess to seem particularly important.
Summary of the invention
The technical problem to be solved in the present invention is, defect for prior art, a kind of appraisal procedure of boiler water-wall tube hydrogen damage is provided, with its to metal material the Non-Destructive Testing mode without hydrogen damage grading and assessment, the boiler water-wall tube hydrogen damage of in-service operation is carried out to detection and assessment reliably, easily and fast.
Technical scheme of the present invention is that the appraisal procedure of the boiler water-wall tube hydrogen damage providing comprises the following steps:
(1), get one of wall pipe in boiler water-wall tube as sample pipe relating to assessment;
(2), choose a pipeline consistent with the material of step (1) institute stopple coupon and specification as test product;
(3), be equipped with a supersonic reflectoscope with compressional wave pulse reflection normal probe and consumptive material couplant.Utilize step (2) test product of getting to carry out zero offset school to this supersonic reflectoscope;
(4), use conventional method, utilize supersonic reflectoscope and couplant through step (3) adjustment, step (2) test product of getting is carried out to ultrasound examination, obtain at least four times on record of the sound pressure amplitude of ultrasonic echo and sound path value record;
(5), use conventional method, by sound pressure amplitude and the sound path value of the ultrasonic echo of step (4) record, set up product logarithmic function and the sound path curve map of corresponding sound pressure amplitude and sound path value;
(6) sound pressure amplitude that, use step (5) is set up and product logarithmic function and the sound path curve map of sound path value carry out linear fit, simulate linear functional relation formula, the slope of this linear functional relation formula is the ultrasonic attenuation coefficient a of step (2) test product of getting
0;
(7), use conventional method, utilize supersonic reflectoscope and couplant through step (3) adjustment, step (1) institute stopple coupon is carried out to ultrasound examination, obtain at least four times on record of the sound pressure amplitude of ultrasonic echo and sound path value record;
(8), use conventional method, by sound pressure amplitude and the sound path value of the ultrasonic echo of step (7) record, set up product logarithmic function and the sound path curve map of corresponding sound pressure amplitude and sound path value;
(9) sound pressure amplitude that, use step (8) is set up and product logarithmic function and the sound path curve map of sound path value carry out linear fit, simulate linear functional relation formula, the slope of this linear functional relation formula is the ultrasonic attenuation coefficient a of step (1) institute stopple coupon
1;
(10), use step (6) gained ultrasonic attenuation coefficient a
0, step (9) gained ultrasonic attenuation coefficient a
1, press formula Δ=a
0/ a
1, in formula, Δ is hydrogen damage degree factor values, calculates, the business of gained is and relates to assessment boiler water-wall tube hydrogen damage degree factor values Δ;
(11), utilize step (10) gained to relate to assessment boiler water-wall tube hydrogen damage degree factor values Δ, according to conventional hydrogen damage graded features, make boiler water-wall tube hydrogen damage assessment result, described in being about to, relate to the corresponding rank of assessment boiler water-wall tube hydrogen damage degree factor values Δ and relate to as evaluating this relative risk degree of assessing boiler water-wall tube hydrogen damage:
(11.1), when Δ≤1.2, the corresponding hydrogen damage rank of Δ is I level, make and relate to assessment boiler water-wall tube without the assessment result of hydrogen damage, this assessment result represent to relate to assessment boiler water-wall tube without obviously decarburization, micro-crack, organize unchanged;
(11.2) when 1.2 < Δ≤1.3, the corresponding hydrogen damage rank of Δ is II level, make the assessment result that relates to the slight hydrogen damage of assessment boiler water-wall tube, this assessment result represents to relate to assessment boiler water wall inside pipe wall and has a small amount of decarburization phenomenon, without obvious micro-crack;
(11.3) when 1.3 < Δ≤1.4, the corresponding hydrogen damage rank of Δ is III level, make the assessment result that relates to the general hydrogen damage of assessment boiler water-wall tube, this assessment result represents to relate to assessment boiler water wall inside pipe wall and has decarburization phenomenon, there is the brilliant micro-crack in obvious edge, along brilliant micro-crack bunchiness not;
(11.4) when Δ > 1.4, the corresponding hydrogen damage rank of Δ is IV level, make the assessment result that relates to the serious hydrogen damage of assessment boiler water-wall tube, this assessment result represents to relate to assessment boiler water wall inside pipe wall and has serious decarburization phenomenon, there is obvious micro-crack, along brilliant micro-crack bunchiness.
The invention has the beneficial effects as follows, while using this method to detect with assessment boiler water-wall tube hydrogen damage, without measured material is carried out to special processing, utilize material compressional wave ultrasonic attenuation index variation difference characteristic and hydrogen damage classification to analyze, can detect and assess boiler water-wall tube hydrogen damage degree, according to the hydrogen damage evaluation factor value of its ultrasonic echo attenuation coefficient, can assess boiler water-wall tube hydrogen damage degree.There is program simple, easy to operate, detect and the feature such as assessment result is accurate, be fast detecting and the effective ways of assessment boiler water-wall tube hydrogen damage.And testing environment is loosely required, and convenient and swift, especially narrow and small high bit space can effectively be measured and be put in place, significantly improved measurement efficiency.
Embodiment
Embodiment 1:
(1), get one of wall pipe in boiler water-wall tube as sample pipe relating to assessment;
(2), choose a pipeline consistent with the material of step (1) institute stopple coupon and specification as test product;
(3), be equipped with a supersonic reflectoscope with compressional wave pulse reflection normal probe and consumptive material couplant.Utilize step (2) test product of getting to carry out zero offset school to this supersonic reflectoscope; The Chinese prestige HS610e type supersonic reflectoscope that supersonic reflectoscope adopts Wuhan, China Zhong Ke innovative technology joint-stock company to produce is joined by this institute.This supersonic reflectoscope is with compressional wave pulse reflection normal probe to adopt commercially available general A type pulse reflection compressional wave normal probe, frequency 5MHz, wafer diameter Ф 6mm; Couplant adopts commercially available regular engine oil, and surface is compensated for as 0dB;
(4), use conventional method, utilize supersonic reflectoscope and couplant through step (3) adjustment, step (2) test product of getting is carried out to ultrasound examination, obtain four times on record of the sound pressure amplitude of ultrasonic echo and sound path value record;
(5), use conventional method, by sound pressure amplitude and the sound path value of the ultrasonic echo of step (4) record, set up product logarithmic function and the sound path curve map of corresponding sound pressure amplitude and sound path value;
(6) sound pressure amplitude that, use step (5) is set up and product logarithmic function and the sound path curve map of sound path value carry out linear fit, simulate linear functional relation formula, the slope of this linear functional relation formula is the ultrasonic attenuation coefficient a of step (2) test product of getting
0;
(7), use conventional method, utilize supersonic reflectoscope and couplant through step (3) adjustment, step (1) institute stopple coupon is carried out to ultrasound examination, obtain four times on record of the sound pressure amplitude of ultrasonic echo and sound path value record;
(8), use conventional method, by sound pressure amplitude and the sound path value of the ultrasonic echo of step (7) record, set up product logarithmic function and the sound path curve map of corresponding sound pressure amplitude and sound path value;
(9) sound pressure amplitude that, use step (8) is set up and product logarithmic function and the sound path curve map of sound path value carry out linear fit, simulate linear functional relation formula, the slope of this linear functional relation formula is the ultrasonic attenuation coefficient a1 of step (1) institute stopple coupon;
(10), use step (6) gained ultrasonic attenuation coefficient a
0, step (9) gained ultrasonic attenuation coefficient a
1, press formula Δ=a
0/ a
1, in formula, Δ is hydrogen damage degree factor values, calculates, the business of gained is and relates to assessment boiler water-wall tube hydrogen damage degree factor values Δ;
(11), utilize step (10) gained to relate to assessment boiler water-wall tube hydrogen damage degree factor values Δ, according to conventional hydrogen damage graded features, make boiler water-wall tube hydrogen damage assessment result, described in being about to, relate to the corresponding rank of assessment boiler water-wall tube hydrogen damage degree factor values Δ and relate to as evaluating this relative risk degree of assessing boiler water-wall tube hydrogen damage: Δ≤1.2, the corresponding hydrogen damage rank of Δ is I level, make and relate to assessment boiler water-wall tube without the assessment result of hydrogen damage, this assessment result represents to relate to assessment boiler water-wall tube without obvious decarburization, micro-crack, organize unchanged.
Embodiment 2:
Step (1)～(3) are with embodiment 1;
(4), use conventional method, utilize supersonic reflectoscope and couplant through step (3) adjustment, step (2) test product of getting is carried out to ultrasound examination, obtain five times on record of the sound pressure amplitude of ultrasonic echo and sound path value record;
Step (5)～(6) are with embodiment 1;
(7), use conventional method, utilize supersonic reflectoscope and couplant through step (3) adjustment, step (1) institute stopple coupon is carried out to ultrasound examination, obtain five times on record of the sound pressure amplitude of ultrasonic echo and sound path value record;
Step (8)～(10) are with embodiment 1;
(11), utilize step (10) gained to relate to assessment boiler water-wall tube hydrogen damage degree factor values Δ, according to conventional hydrogen damage graded features, make boiler water-wall tube hydrogen damage assessment result, described in being about to, relate to the corresponding rank of assessment boiler water-wall tube hydrogen damage degree factor values Δ and relate to the relative risk degree of assessing boiler water-wall tube hydrogen damage: Δ > 1.4 as evaluating this, the corresponding hydrogen damage rank of Δ is IV level, make the assessment result that relates to the serious hydrogen damage of assessment boiler water-wall tube, this assessment result represents to relate to assessment boiler water wall inside pipe wall and has serious decarburization phenomenon, there is obvious micro-crack, along brilliant micro-crack bunchiness.
Claims (1)
1. an appraisal procedure for boiler water-wall tube hydrogen damage, the method comprises the following steps:
(1), get one of wall pipe in boiler water-wall tube as sample pipe relating to assessment;
(2), choose a pipeline consistent with the material of step (1) institute stopple coupon and specification as test product;
(3), be equipped with a supersonic reflectoscope with compressional wave pulse reflection normal probe and consumptive material couplant, utilize step (2) test product of getting to carry out zero offset school to this supersonic reflectoscope;
(4), use conventional method, utilize supersonic reflectoscope and couplant through step (3) adjustment, step (2) test product of getting is carried out to ultrasound examination, obtain at least four times on record of the sound pressure amplitude of ultrasonic echo and sound path value record;
(5), use conventional method, by sound pressure amplitude and the sound path value of the ultrasonic echo of step (4) record, set up product logarithmic function and the sound path curve map of corresponding sound pressure amplitude and sound path value;
(6) sound pressure amplitude that, use step (5) is set up and product logarithmic function and the sound path curve map of sound path value carry out linear fit, simulate linear functional relation formula, the slope of this linear functional relation formula is the ultrasonic attenuation coefficient a0 of step (2) test product of getting;
(7), use conventional method, utilize supersonic reflectoscope and couplant through step (3) adjustment, step (1) institute stopple coupon is carried out to ultrasound examination, obtain at least four times on record of the sound pressure amplitude of ultrasonic echo and sound path value record;
(8), use conventional method, by sound pressure amplitude and the sound path value of the ultrasonic echo of step (7) record, set up product logarithmic function and the sound path curve map of corresponding sound pressure amplitude and sound path value;
(9) sound pressure amplitude that, use step (8) is set up and product logarithmic function and the sound path curve map of sound path value carry out linear fit, simulate linear functional relation formula, the slope of this linear functional relation formula is the ultrasonic attenuation coefficient a1 of step (1) institute stopple coupon;
(10), use step (6) gained ultrasonic attenuation coefficient a
0, step (9) gained ultrasonic attenuation coefficient a
1, press formula Δ=a
0/ a
1, in formula, Δ is hydrogen damage degree factor values, calculates, the business of gained is and relates to assessment boiler water-wall tube hydrogen damage degree factor values Δ;
(11), utilize step (10) gained to relate to assessment boiler water-wall tube hydrogen damage degree factor values Δ, according to conventional hydrogen damage graded features, make boiler water-wall tube hydrogen damage assessment result, described in being about to, relate to the corresponding rank of assessment boiler water-wall tube hydrogen damage degree factor values Δ and relate to as evaluating this relative risk degree of assessing boiler water-wall tube hydrogen damage:
(11.1), when Δ≤1.2, the corresponding hydrogen damage rank of Δ is I level, make and relate to assessment boiler water-wall tube without the assessment result of hydrogen damage, this assessment result represent to relate to assessment boiler water-wall tube without obviously decarburization, micro-crack, organize unchanged;
(11.2) when 1.2 < Δ≤1.3, the corresponding hydrogen damage rank of Δ is II level, make the assessment result that relates to the slight hydrogen damage of assessment boiler water-wall tube, this assessment result represents to relate to assessment boiler water wall inside pipe wall and has a small amount of decarburization phenomenon, without obvious micro-crack;
(11.3) when 1.3 < Δ≤1.4, the corresponding hydrogen damage rank of Δ is III level, make the assessment result that relates to the general hydrogen damage of assessment boiler water-wall tube, this assessment result represents to relate to assessment boiler water wall inside pipe wall and has decarburization phenomenon, there is the brilliant micro-crack in obvious edge, along brilliant micro-crack bunchiness not;
(11.4) when Δ > 1.4, the corresponding hydrogen damage rank of Δ is IV level, make the assessment result that relates to the serious hydrogen damage of assessment boiler water-wall tube, this assessment result represents to relate to assessment boiler water wall inside pipe wall and has serious decarburization phenomenon, there is obvious micro-crack, along brilliant micro-crack bunchiness.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568076A (en) * | 2019-10-22 | 2019-12-13 | 张大练 | ultrasonic detection and diagnosis method for hydrogen damage of boiler water wall pipe |
| CN117571739A (en) * | 2024-01-16 | 2024-02-20 | 中国人民解放军陆军装甲兵学院 | Pipe wall ablation abrasion degree assessment method based on intelligent algorithm |
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|---|---|---|---|---|
| US5243862A (en) * | 1991-06-04 | 1993-09-14 | The Babcock & Wilcox Company | Confirmation of hydrogen damage in boiler tubes by refracted shear waves |
| CN102621224A (en) * | 2012-03-26 | 2012-08-01 | 湖南省湘电锅炉压力容器检验中心有限公司 | Method for measuring ultrasonic attenuation coefficient of solid material |
| CN103245726A (en) * | 2013-04-02 | 2013-08-14 | 华东理工大学 | Device and method for detecting material hydrogen damage through ultrasonic surface waves |
| CN103293225A (en) * | 2013-05-28 | 2013-09-11 | 国家电网公司 | Ultrasonic detection and diagnosis method for hydrogen damages on water-cooling wall pipe of boiler |
-
2013
- 2013-09-29 CN CN201310454706.0A patent/CN103529127B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5243862A (en) * | 1991-06-04 | 1993-09-14 | The Babcock & Wilcox Company | Confirmation of hydrogen damage in boiler tubes by refracted shear waves |
| CN102621224A (en) * | 2012-03-26 | 2012-08-01 | 湖南省湘电锅炉压力容器检验中心有限公司 | Method for measuring ultrasonic attenuation coefficient of solid material |
| CN103245726A (en) * | 2013-04-02 | 2013-08-14 | 华东理工大学 | Device and method for detecting material hydrogen damage through ultrasonic surface waves |
| CN103293225A (en) * | 2013-05-28 | 2013-09-11 | 国家电网公司 | Ultrasonic detection and diagnosis method for hydrogen damages on water-cooling wall pipe of boiler |
Non-Patent Citations (1)
| Title |
|---|
| 马剑民: "火力发电厂锅炉水冷壁管氢损伤超声检测工艺的研究及应用", 《热力发电》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568076A (en) * | 2019-10-22 | 2019-12-13 | 张大练 | ultrasonic detection and diagnosis method for hydrogen damage of boiler water wall pipe |
| CN117571739A (en) * | 2024-01-16 | 2024-02-20 | 中国人民解放军陆军装甲兵学院 | Pipe wall ablation abrasion degree assessment method based on intelligent algorithm |
| CN117571739B (en) * | 2024-01-16 | 2024-03-12 | 中国人民解放军陆军装甲兵学院 | Pipe wall ablation abrasion degree assessment method based on intelligent algorithm |
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Effective date of registration: 20180718 Address after: 410004 398 new Shao Dong Road, Tianxin District, Changsha, Hunan Co-patentee after: Power Science Research Institute of Hunan Electric Power Co., Ltd. Patentee after: State Grid Hunan Electric Power Co., Ltd. Co-patentee after: State Grid Corporation of China Address before: 100033 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee before: Electric Power Research Institute, State Grid Hunan Electric Power Company Patentee before: State Grid Corporation of China Co-patentee before: Hunan Xiangdian Boiler Pressure Vessel Examination Center Co., Ltd. |