CN101799313B - Lifting force detecting method for accumulating amount of oxide scale in austenitic stainless steel elbow pipe of boiler - Google Patents
Lifting force detecting method for accumulating amount of oxide scale in austenitic stainless steel elbow pipe of boiler Download PDFInfo
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- CN101799313B CN101799313B CN2010101354931A CN201010135493A CN101799313B CN 101799313 B CN101799313 B CN 101799313B CN 2010101354931 A CN2010101354931 A CN 2010101354931A CN 201010135493 A CN201010135493 A CN 201010135493A CN 101799313 B CN101799313 B CN 101799313B
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Abstract
The invention discloses a lifting force detecting method for the accumulating amount of oxide scale in an austenitic stainless steel elbow pipe of a boiler, which comprises the following steps of: (1) selecting a sample pipe; (2) adding oxide scale into the sample pipe; (3) carrying out magnetization processing on the oxide scale accumulated in the elbow pipe; and measuring a magnetic field lifting force value of the oxide scale in an elbow of the sample pipe; (4) and (5) making a relation curve figure between the accumulating amount of the oxide scale in different sample pipes and the corresponding magnetic field lifting force values; (6) carrying out magnetization processing on the oxide scale accumulated in the elbow pipe in the detected boiler elbow pipe and measuring the magnetic field lifting force value F of the oxide scale accumulated in the elbow pipe; and (7) searching out the accumulating amount of the oxide scale in the detected boiler elbow pipe by using the relation curve figure. The method can carry out nondestructive detection on the oxide scale in the austenitic stainless steel elbow pipe of the in-service boiler without special processing and has the characteristics of simplicity, safety, reliability and high sensitivity.
Description
Technical field
The invention belongs to technical field of nondestructive testing, relate to the lifting force detection method of oxide skin accumulating amount in a kind of boiler austenitic stainless steel elbow.Be applicable to the superheater to large-sized boiler, the detection that reheater is used the oxide skin accumulating amount in the austenitic stainless steel elbow.
Background technology
The coarse-grain austenitic stainless steel has high heat resistance, good corrosion stability, high-temperature mechanical property and good welds, thereby obtained using widely in large-sized station boiler and nuclear power component manufacture, but operating experience shows, this class stainless-steel tube is in operation and easily produces high temperature resistance steam oxidation poor-performing, can occur serious steam side oxide skin in station boiler in superheater and the reheater operational process peels off, the oxide skin of peeling off forms obstruction in boiler bent pipe, thereby the boiler bent pipe that stops up causes temperature sharply to rise causes overheated booster, has a strong impact on the safe and stable operation of boiler.In order to prevent the generation of pipe explosion accident, very necessary to the detection of scale cinder accumulation amount in boiler bent pipe.And at present ray detection is generally adopted in the measurement of oxide skin accumulating amount in the boiler coarse-grain austenitic stainless steel elbow, owing to be subjected to the restriction of site space, implement the bigger and easy omission of this method difficulty, and, influence carrying out smoothly of other service works because ray is bigger to the harm of human body.
Summary of the invention
The technical problem to be solved in the present invention is, pile up the defective that difficulty is big, sensitivity is low at the oxide skin that above-mentioned ray detection method detects in the boiler bent pipe, propose a kind of reliably, easily, the lifting force detection method of oxide skin accumulating amount in the boiler austenitic stainless steel elbow fast, so that discovery in time, processing are in time stopped up, avoid stopping up the frequent booster of initiation because of oxide skin.
Technical solution of the present invention is that the lifting force detection method of oxide skin accumulating amount comprises the steps: in the boiler austenitic stainless steel elbow
1, selects austenitic stainless steel elbow on the boiler as the sample pipe;
2, the oxide skin that progressively adds a mass unit at an end of institute's stopple coupon forms different oxide skin accumulating amounts;
3, corresponding to each the oxide skin accumulating amount in the sample pipe, on the outer wall of the elbow bottom of sample pipe, apply a permanent magnetic field with conventional method, the oxide skin of piling up in the described sample pipe is magnetized processing; Re-use conventional method and measure permanent magnetic field under the situation of permanent magnetic field to the magnetic field lifting force value of the oxide skin in the sample pipe bend or removing and add under the situation of permanent magnetic field the magnetic field lifting force value of oxide skin in the test specimens pipe keeping adding;
4, make graph of relation between oxide skin accumulating amount in the sample pipe and the corresponding magnetic field lifting force value according to the magnetic field lifting force value of the oxide skin accumulating amount of step 2 and step 3 correspondence;
5, according to step 1 to 4 graph of relation of making between oxide skin accumulating amount and the corresponding magnetic field lifting force value of boiler austenitic stainless steel sample pipe of unlike material, different size and different types;
When 6, implementing on-the-spot the detection, on the outer wall of the bottom of detected boiler bent pipe, use conventional method to apply one and stablize the oxide skin of piling up in to boiler bent pipe in permanent magnetic field and magnetize processing; Re-use conventional method and measure the magnetic field lifting force value F of the oxide skin of piling up in the boiler bent pipe under the detected steady magnetic strength or the magnetic field lifting force value F of the interior oxide skin of piling up of boiler bent pipe;
7, use the graph of relation of step 5 making and detected bend pipe contrast, find with the detected boiler sample pipe that the boiler bent pipe material is identical, specification is identical and pattern is identical in the accumulating amount of oxide skin and the graph of relation of pairing magnetic field lifting force value, find the boiler bent pipe magnetic field lifting force value F identical magnetic field lifting force value pairing oxide skin accumulating amount detected at graph of relation, be the on-the-spot detected interior oxide skin accumulating amount of boiler bent pipe with step 6.
The invention has the beneficial effects as follows, need not pipeline outer wall is carried out special processing when using this method to detect, can carry out Non-Destructive Testing to the oxide skin that in the labour boiler tubing, is deposited in the bend pipe, have simple, safe, reliable, highly sensitive characteristics, therefore loose to the environmental requirement that detects, and convenient and swift, especially put in place, thereby improved detection efficiency significantly detecting effectively between narrow and small pipe emptying.
Description of drawings
Fig. 1 is the inventive method applies permanent magnetic field to the oxide skin in the sample pipe a synoptic diagram.
Fig. 2 is the synoptic diagram of the inventive method to the test of the oxide skin in sample pipe magnetic field lifting force value.
Fig. 3 is the graph of relation of oxide skin accumulating amount and corresponding magnetic field lifting force value in the sample pipe.
Embodiment
Embodiment
(1), the boiler austenitic stainless steel elbow of selecting unlike material, different size and different types from the boiler scene respectively is as sample, takes out oxide skin in institute's stopple coupon pipe, comprise as the bend pipe sample: L shaped curved Φ 57 * 4.5mm, material is TP304H; U-shaped is bent Φ 57 * 4.5mm, and material is the curved Φ 51 * 6mm of TP304H and V-arrangement, and material is TP304H;
(2), simulate the boiler scene, respectively in the end adding 5g of institute's stopple coupon oxide skin;
(3), the bend pipe 1 bottom outer wall in step (2) uses permanent magnet 3 formation magnetic field intensitys to be 356.6mT one permanent magnetic field, make the outer camber line tangent line of permanent magnetic field normal direction and elbow vertical, utilize this magnetic field that the oxide skin 2 of piling up in the described bend pipe 1 is carried out the routine magnetization and handle, referring to Fig. 1;
(4), use conventional dynamometer 4 to measure the lifting force value 1.5N that step (3) applies the oxide skin in the sample pipe bend under the permanent magnetic field, write down the pairing magnetic field of oxide skin accumulating amount lifting force value in the various kinds pipe respectively; Also can measure the magnetic field lifting force value by instrument, referring to Fig. 2 with the stress test sheet of routine;
(5), be added with the end integral multiple of (2) the described 5g oxide skin of progressively increasing progressively set by step of the sample pipe of oxide skin in step (2);
(6), repeating step (3), step (4) successively;
(7), repeating step (5), step (6) successively;
(8), by the accumulating amount and the corresponding lifting force value thereof of the oxide skin of above-mentioned steps record, conventional method is made and is added under the permanent magnetic field, L shaped curved Φ 57 * 4.5mm, material is TP304H; U-shaped is bent Φ 57 * 4.5mm, and material is the curved Φ 51 * 6mm of TP304H and V-arrangement, material be in the sample pipe of TP304H in the graph of relation of oxide skin accumulating amount and corresponding magnetic field lifting force value, as shown in Figure 3;
When (9), implementing on-the-spot the detection, use magnetic field intensity to be 356.6mT one permanent magnetic field, with contact on the bottom outer wall of detected boiler bent pipe, make the outer camber line tangent line of steady magnetic field normal direction and elbow vertical, utilize this magnetic field that the oxide skin of piling up in the bend pipe is carried out routine magnetization processing;
(10), use dynamometer (or stress test sheet) to measure the magnetic field lifting force value F of the oxide skin of piling up in the bend pipe detected under the permanent magnetic strength;
(11), use the contrast of step (8) graph of relation of being set up and detected bend pipe, find with the detected bend pipe that the bend pipe material is identical, specification is identical and pattern is identical in the accumulating amount of oxide skin and the relation curve of pairing magnetic field lifting force value, with the pairing oxide skin accumulating amount of above-mentioned magnetic field lifting force value F same magnetic field lifting force value, be the on-the-spot detected interior oxide skin accumulating amount of boiler bent pipe.As through the contrast, find the curved Φ 57 * 4.5mm of U-shaped among the figure, material is that the relation curve of oxide skin accumulating amount and corresponding magnetic field lifting force value of TP304H sample pipe is identical with material, specification and the pattern of on-the-spot detected boiler bent pipe, and the magnetic field lifting force value F of the oxide skin of piling up in the detected boiler bent pipe is 3.9N, then corresponding curve oxide skin accumulating amount is 20g, and this oxide skin accumulating amount is the on-the-spot detected interior oxide skin accumulating amount of boiler bent pipe.
In the said method step (4), also permanent magnet can be removed, add under the situation of permanent magnetic field the magnetic field lifting force value of oxide skin in the test specimens pipe removing, and make graph of relation.Because oxide skin is magnetized under the effect that adds permanent magnetic field in the sample pipe, to remove and still have magnetic force after adding permanent magnetic field, also available conventional method is tested its magnetic field lifting force value.Certainly, step (10) is to the detection of scene to boiler bent pipe, and the magnetic field lifting force value F of the oxide skin of piling up in the bend pipe also should carry out removing under the situation that adds permanent magnetic field.
Claims (1)
1. the lifting force detection method of the interior oxide skin accumulating amount of boiler austenitic stainless steel elbow is characterized in that comprising the steps:
(1), selects austenitic stainless steel elbow on the boiler as the sample pipe;
(2), the oxide skin that progressively adds a mass unit at an end of institute's stopple coupon forms different oxide skin accumulating amounts;
(3), corresponding to each the oxide skin accumulating amount in the sample pipe, on the outer wall of the elbow bottom of sample pipe, apply a permanent magnetic field with conventional method, the oxide skin of piling up in the described sample pipe is magnetized processing; Re-use conventional method and measure permanent magnetic field under the situation of permanent magnetic field to the magnetic field lifting force value of the oxide skin in the sample pipe bend or removing and add the magnetic field lifting force value of measuring oxide skin in the test specimens pipe under the situation of permanent magnetic field keeping adding;
(4), make graph of relation between oxide skin accumulating amount in the sample pipe and the corresponding magnetic field lifting force value according to the magnetic field lifting force value of the oxide skin accumulating amount of step 2 and step 3 correspondence;
(5), according to step 1 to 4 graph of relation of making between oxide skin accumulating amount and the corresponding magnetic field lifting force value of boiler austenitic stainless steel sample pipe of unlike material, different size and different types;
(6), when implementing on-the-spot the detection, on the outer wall of the bottom of detected boiler bent pipe, use conventional method to apply one and stablize the oxide skin of piling up in to boiler bent pipe in permanent magnetic field and magnetize processing; Re-use conventional method and measure permanent magnetic field under the situation of permanent magnetic field to the magnetic field lifting force value of the oxide skin in the detected boiler bent pipe or withdrawing from and add the magnetic field lifting force value of measuring oxide skin in the detected boiler bent pipe under the situation of permanent magnetic field keeping adding;
(7), use the graph of relation of step 5 making and detected bend pipe contrast, find with the detected boiler sample pipe that the boiler bent pipe material is identical, specification is identical and pattern is identical in the accumulating amount of oxide skin and the graph of relation of pairing magnetic field lifting force value, find the boiler bent pipe magnetic field lifting force value identical magnetic field lifting force value pairing oxide skin accumulating amount detected at graph of relation, be the on-the-spot detected interior oxide skin accumulating amount of boiler bent pipe with step 6.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102052662B (en) * | 2010-10-26 | 2014-10-08 | 华南理工大学 | On-line prewarning device and prewarning method for iron scale blockage in high-temperature pipeline of super-critical boiler |
| CN107478147B (en) * | 2017-08-01 | 2019-12-06 | 湘潭大学 | Pulse eddy current detection method and device for thickness of accumulated scale falling off in austenitic boiler tube |
| CN108240850B (en) * | 2018-01-29 | 2020-06-26 | 国电锅炉压力容器检验中心 | Method for detecting oxide accumulation amount in austenitic stainless steel pipe |
| 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 |
| CN111413243A (en) * | 2019-01-04 | 2020-07-14 | 国电锅炉压力容器检验有限公司 | Intelligent quantitative detection method and detector for accumulated oxide skin in boiler tube |
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| JP2000131008A (en) * | 1998-10-26 | 2000-05-12 | Kawasaki Steel Corp | Apparatus for detecting deposit quantity of magnetic body |
| EP1227296A1 (en) * | 2001-01-19 | 2002-07-31 | Framatome ANP GmbH | Measuring system for evaluating the thickness of an oxide layer ( shadow corrosion, lift off ) with a leading sledge |
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Owner name: HU NAN ELECTRIC POWER COMPANY RESEARCH ACADEMY STA Effective date: 20130910 |
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Effective date of registration: 20130910 Address after: 410007 M3 group, torch City, hi tech Development Zone, Hunan, Changsha Patentee after: Hunan Xiangdian Boiler Pressure Vessel Examination Center Co., Ltd. Patentee after: Science Research Institute of Hunan Electric Power Co., Ltd. Patentee after: State Grid Corporation of China Address before: 410007, No. 79 hydroelectric power street, Yuhua District, Hunan, Changsha Patentee before: Hunan Xiangdian Boiler Pressure Vessel Examination Center Co., Ltd. |