CN103439402B - Ferromagnetism thing deposition chocking-up degree detection method in boiler austenitic stainless steel elbow - Google Patents
Ferromagnetism thing deposition chocking-up degree detection method in boiler austenitic stainless steel elbow Download PDFInfo
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Abstract
The invention discloses ferromagnetism thing deposition chocking-up degree detection method in a kind of boiler austenitic stainless steel elbow, comprising: choose the bend pipe identical with the boiler austenitic stainless steel elbow needing to detect as sample pipe, respectively in the positive bottom of sample pipe outer wall being added with ferromagnetism thing, positive sidepiece and positive top apply a steady magnetic field, measure corresponding magnetic flux value, record the magnetic flux mean value in sample pipe corresponding to ferromagnetism thing accumulated plugging sectional area respectively, opening relationships curve map, same method is adopted to apply a steady magnetic field to tested test tube and the magnetic flux mean value Ф measuring the ferromagnetism thing in tested test tube contrasts with graph of relation, find and the ferromagnetism thing accumulated plugging sectional area corresponding to above-mentioned magnetic flux mean value Ф common flux value, be the ferromagnetism thing accumulated plugging area S in on-the-spot tested test tube.Without the need to carrying out special processing to pipeline outer wall when this method detects, there is simple, safe, reliable, highly sensitive feature.
Description
Technical field
The invention belongs to lossless detection method, be specifically related to ferromagnetism thing deposition chocking-up degree detection method in a kind of boiler austenitic stainless steel elbow.
Background technology
Coarse grained austenite stainless steel has high heat resistance, excellent corrosion stability, high-temperature mechanical property and good welds, is thus widely used at large-sized station boiler and nuclear power component manufacture.But operating experience shows, the high temperature resistance steam oxidation poor-performing of this kind of stainless-steel tube, serious steam side scale spallation is there will be in superheater and reheater operational process in station boiler, the oxide skin of peeling off deposits/piles up and forms blocking in boiler bent pipe, and the boiler bent pipe of blocking causes temperature sharply to rise thus causes overheated booster; And in capital construction or operational process, in constructin phase legacy (as iron filings, steel bistrique etc.) or operational process, the annex (as temperature survey sleeve pipe, attemperator annex etc.) of boiler plant comes off, enter reheater or superheater with steam and deposit/be deposited in lower bend and form blocking, cause temperature sharply to rise and produce booster, having 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 ferromagnetism thing deposition/accumulating amount in boiler stainless steel elbow.And at present ray detection is generally adopted to the measurement of ferromagnetism thing deposition/accumulating amount in boiler coarse grained austenite stainless steel elbow, owing to being subject to the restriction of site space, implement the method difficulty more greatly and easily undetected, and due to ray comparatively large to the harm of human body, affect carrying out smoothly of other service works.
Summary of the invention
The object of this invention is to provide a kind of by ferromagnetism thing deposition chocking-up degree detection method in on-the-spot restriction, the boiler austenitic stainless steel elbow that easy to use, Detection results good, efficiency is high.
The technical scheme realizing the object of the invention employing is as follows:
Ferromagnetism thing deposition chocking-up degree detection method in boiler austenitic stainless steel elbow provided by the invention, carry out according to the following steps:
1, choose with the same material of boiler austenitic stainless steel elbow needing to detect, same specification, with the bend pipe of pattern as sample pipe;
2, the magnetic flux detecting instrument that qualified is selected;
3, be wound around sample pipe one fixing turn with wire, composition magnetic flux measuring coil, wire two ends are connected with magnetic flux detecting instrument input end respectively;
4, simulate boiler on-the-spot, add in one end of institute's stopple coupon the ferromagnetism thing that sectional area is one digit number integer;
5, be added with in the positive bottom of elbow of the sample pipe of ferromagnetism thing, positive sidepiece and positive external wall of upper portion in step 4 respectively and use conventional method to apply a steady magnetic field, utilize this magnetic field to carry out conventional magnetization process to the ferromagnetism thing piled up in described sample pipe;
6, use conventional method measures the magnetic flux value that steady magnetic field in steps of 5 applies the ferromagnetism thing in diverse location loading pipe respectively, record the magnetic flux value corresponding to ferromagnetism thing accumulated plugging sectional area in the sample pipe under this position respectively, and the magnetic flux value of 3 position measurements is averaged;
7, progressively to progressively increase ferromagnetism thing by the integral multiple of integer described in step 4 in the one end being added with the sample pipe of ferromagnetism thing in step 4;
8, step 5, step 6 is repeated successively;
9, step 7, step 8 is repeated successively;
10, by accumulated plugging sectional area and the corresponding magnetic flux value thereof of the ferromagnetism thing of above-mentioned steps record, set up by conventional method and outside to intensify under magnetic field ferromagnetism thing accumulated plugging sectional area and the graph of relation to magnetic flux mean value in sample pipe;
When 11, implementing Site Detection, to the boiler austenitic stainless steel elbow detected be needed as tested test tube, be wound around the tested test tube number of turns identical with sample pipe with wire, composition magnetic flux measuring coil, wire two ends are connected with magnetic flux detecting instrument input end respectively;
12, in the positive bottom of tested test tube, positive side and positive external wall of upper portion, use conventional method to apply a steady magnetic field, utilize this magnetic field to carry out conventional magnetization process to the ferromagnetism thing piled up in tested test tube;
The magnetic flux value of the ferromagnetism thing on 13, use conventional method to measure respectively diverse location that steady magnetic field in step 12 applies in tested test tube, record the magnetic flux value corresponding to ferromagnetism thing accumulating amount in the tested test tube under this position respectively, and the magnetic flux value of 3 position measurements is averaged Ф;
14, the graph of relation using step 10 to set up contrasts with the magnetic flux mean value Ф of tested test tube, find and the ferromagnetism thing accumulated plugging sectional area corresponding to above-mentioned magnetic flux mean value Ф common flux value, be the ferromagnetism thing accumulated plugging area S in on-the-spot tested test tube;
15, ferromagnetism thing accumulated plugging area S value steam flow area theoretical with it S in the tested test tube detected by step 14 is used
0ratio, be ferromagnetism thing deposition/accumulated plugging ratio in on-the-spot tested test tube, ferromagnetism thing deposition/accumulated plugging degree in this detection bend pipe can be obtained by blocked area S and blockage ratio numerical value.
The invention has the beneficial effects as follows, without the need to carrying out special processing to pipeline outer wall when using this method to detect, Non-Destructive Testing can be carried out to the ferromagnetism thing be deposited in bend pipe in in-service boiler Austenitic stainless steel pipe road, there is simple, safe, reliable, highly sensitive feature, therefore loose to the environmental requirement detected, and convenient and swift, especially effectively can both detect emptying of narrow and small pipe and put in place, thus improve detection efficiency significantly.
Technical scheme of the present invention is further illustrated below in conjunction with accompanying drawing.
Accompanying drawing explanation
Fig. 1 applies Constant charge soil position view to ferromagnetism thing in sample pipe in the inventive method.
Fig. 2 is that in sample pipe, ferromagnetism thing deposition section amasss the graph of relation with magnetic flux value under corresponding magnetic field.
Embodiment
See Fig. 1-Fig. 2, ferromagnetism thing deposition chocking-up degree detection method in boiler austenitic stainless steel elbow provided by the invention, carry out according to the following steps:
1, choose with the same material of boiler austenitic stainless steel elbow needing to detect, same specification, with the bend pipe of pattern as sample pipe;
2, the magnetic flux detecting instrument that qualified is selected;
3, be wound around sample pipe 3 one fixing turn with wire, composition magnetic flux measuring coil 4, wire two ends are connected with magnetic flux detecting instrument input end respectively;
4, simulate boiler on-the-spot, adding sectional area in one end of institute's stopple coupon is 5mm
2ferromagnetism thing;
5, be added with in the positive bottom of elbow of the sample pipe 3 of ferromagnetism thing, positive sidepiece and positive external wall of upper portion in step 4 respectively and use conventional method U magnet 1 to apply a steady magnetic field, utilize this magnetic field to carry out conventional magnetization process (see Fig. 1) to the ferromagnetism thing 2 piled up in described sample pipe;
6, use conventional method measures the magnetic flux value that steady magnetic field in steps of 5 applies the ferromagnetism thing in diverse location loading pipe respectively, record the magnetic flux value corresponding to ferromagnetism thing accumulating amount in the sample pipe under this position respectively, and the magnetic flux value of 3 position measurements is averaged;
7, the one end being added with the sample pipe of ferromagnetism thing in step 4 is progressively 5mm by area described in step 4
2integral multiple to progressively increase ferromagnetism thing;
8, step 5, step 6 is repeated successively;
9, step 7, step 8 is repeated successively;
10, amass and corresponding magnetic flux value by the chocking section of the ferromagnetism thing of above-mentioned steps record, set up by conventional method and outside to intensify under magnetic field under sample tubing matter specification ferromagnetism thing accumulated plugging sectional area and the graph of relation (see Fig. 2) to magnetic flux mean value in bend pipe;
When 11, implementing Site Detection, to the boiler austenitic stainless steel elbow detected be needed as tested test tube, be wound around the tested test tube number of turns identical with sample pipe with wire, composition magnetic flux measuring coil, wire two ends are connected with magnetic flux detecting instrument input end respectively;
12, in the positive bottom of detected boiler stainless steel elbow, positive side and positive external wall of upper portion, use conventional method to apply a steady magnetic field, utilize this magnetic field to carry out conventional magnetization process to the ferromagnetism thing piled up in bend pipe;
The magnetic flux value of the ferromagnetism thing on 13, use conventional method to measure respectively diverse location that steady magnetic field in step 12 applies in tested test tube, record the magnetic flux value corresponding to ferromagnetism thing accumulating amount in the tested test tube under this position respectively, and the magnetic flux value of 3 position measurements is averaged Ф;
14, the graph of relation using step 10 to set up contrasts with the magnetic flux mean value Ф of tested test tube, find and the ferromagnetism thing accumulated plugging sectional area corresponding to above-mentioned magnetic flux mean value Ф common flux value, be the ferromagnetism thing accumulated plugging area S in on-the-spot tested test tube;
15, ferromagnetism thing accumulated plugging area S value steam flow area theoretical with it S in the tested test tube detected by step 14 is used
0ratio, be ferromagnetism thing deposition/accumulated plugging ratio in on-the-spot tested test tube, ferromagnetism thing deposition/accumulated plugging degree in this detection bend pipe can be obtained by blocked area S and blockage ratio numerical value.
Claims (1)
1. a ferromagnetism thing deposition chocking-up degree detection method in boiler austenitic stainless steel elbow, is characterized in that carrying out according to the following steps:
1, choose with the same material of boiler austenitic stainless steel elbow needing to detect, same specification, with the bend pipe of pattern as sample pipe;
2, the magnetic flux detecting instrument that qualified is selected;
3, be wound around sample pipe one fixing turn with wire, composition magnetic flux measuring coil, wire two ends are connected with magnetic flux detecting instrument input end respectively;
4, simulate boiler on-the-spot, add in one end of institute's stopple coupon the ferromagnetism thing that sectional area is one digit number integer;
5, be added with in the positive bottom of elbow of the sample pipe of ferromagnetism thing, positive sidepiece and positive external wall of upper portion in step 4 respectively and use conventional method to apply a steady magnetic field, utilize this magnetic field to carry out conventional magnetization process to the ferromagnetism thing piled up in described sample pipe;
6, use conventional method measures the magnetic flux value that steady magnetic field in steps of 5 applies the ferromagnetism thing in diverse location loading pipe respectively, record the magnetic flux value corresponding to ferromagnetism thing accumulated plugging sectional area in the sample pipe under this position respectively, and the magnetic flux value of 3 position measurements is averaged;
7, progressively to progressively increase ferromagnetism thing by the integral multiple of integer described in step 4 in the one end being added with the sample pipe of ferromagnetism thing in step 4;
8, step 5, step 6 is repeated successively;
9, step 7, step 8 is repeated successively;
10, by accumulated plugging sectional area and the corresponding magnetic flux value thereof of the ferromagnetism thing of above-mentioned steps record, set up by conventional method and outside to intensify under magnetic field ferromagnetism thing accumulated plugging sectional area and the graph of relation to magnetic flux mean value in sample pipe;
When 11, implementing Site Detection, to the boiler austenitic stainless steel elbow detected be needed as tested test tube, be wound around the tested test tube number of turns identical with sample pipe with wire, composition magnetic flux measuring coil, wire two ends are connected with magnetic flux detecting instrument input end respectively;
12, in the positive bottom of tested test tube, positive side and positive external wall of upper portion, use conventional method to apply a steady magnetic field, utilize this magnetic field to carry out conventional magnetization process to the ferromagnetism thing piled up in tested test tube;
The magnetic flux value of the ferromagnetism thing on 13, use conventional method to measure respectively diverse location that steady magnetic field in step 12 applies in tested test tube, record the magnetic flux value corresponding to ferromagnetism thing accumulating amount in the tested test tube under this position respectively, and the magnetic flux value of 3 position measurements is averaged Ф;
14, the graph of relation using step 10 to set up contrasts with the magnetic flux mean value Ф of tested test tube, find and the ferromagnetism thing accumulated plugging sectional area corresponding to above-mentioned magnetic flux mean value Ф common flux value, be the ferromagnetism thing accumulated plugging area S in on-the-spot tested test tube;
15, ferromagnetism thing accumulated plugging area S value steam flow area theoretical with it S in the tested test tube detected by step 14 is used
0ratio, be ferromagnetism thing deposition/accumulated plugging ratio in on-the-spot tested test tube, ferromagnetism thing deposition/accumulated plugging degree in this detection bend pipe can be obtained by blocked area S and blockage ratio numerical value.
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| CN105092691B (en) * | 2014-05-09 | 2018-08-07 | 中国特种设备检测研究院 | A kind of quantitative detecting method and detector of the accumulation of pipeline internal oxidition skin |
| BR112017001112A2 (en) * | 2014-07-22 | 2017-11-14 | Shell Int Research | flexible line deposit detection methods using gamma ray densitometry |
| CN106918642B (en) * | 2017-02-28 | 2020-07-28 | 中国大唐集团科学技术研究院有限公司西北分公司 | Measurement accuracy correction method of measurement equipment for oxide skin deposition in boiler tube |
| CN109975398B (en) * | 2017-12-27 | 2022-10-21 | 核动力运行研究所 | Method for detecting wiring of magnetic flux coil of eddy current detection probe of heat transfer pipe |
| CN109855536B (en) * | 2019-02-28 | 2021-04-16 | 中国海洋石油集团有限公司 | Oil and gas pipeline blockage detection method based on strain measurement |
| CN111897013A (en) * | 2019-11-18 | 2020-11-06 | 吉林省电力科学研究院有限公司 | Quantitative electromagnetic detection method for ferromagnetic blockage in ferromagnetic stainless steel pipe |
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