CN103439401A - Device for detecting deposition amount of ferromagnetic matter in austenite stainless steel bent tube for boiler - Google Patents
Device for detecting deposition amount of ferromagnetic matter in austenite stainless steel bent tube for boiler Download PDFInfo
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- CN103439401A CN103439401A CN201310354534XA CN201310354534A CN103439401A CN 103439401 A CN103439401 A CN 103439401A CN 201310354534X A CN201310354534X A CN 201310354534XA CN 201310354534 A CN201310354534 A CN 201310354534A CN 103439401 A CN103439401 A CN 103439401A
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Abstract
The invention discloses a device for detecting the deposition amount of a ferromagnetic matter in an austenite stainless steel bent tube for a boiler. The device comprises a detecting probe, a magnetic flux integrator, a drifting regulation system, a central processing unit (CPU) and an output display system (A/D conversion), wherein the output end of the detecting probe is connected with the input end of the magnetic flux integrator, the output end of the magnetic flux integrator is connected with the input end of the central processing unit and is connected in series with the drifting regulation system, and the output end of the central processing unit (CPU) is connected with the output display system (A/D conversion). When the device is used, the special treatment is not required to be performed on the outer wall of the pipeline, and the nondestructive detection can be perfomed on the ferromagnetic matter in the stainless steel bent tube, the drifting effect is automatically eliminated, so that the measured data is accurate, the detecting device has the characteristics of simplicity, safety, reliability and high sensibility, therefore, the environmental requirement on detection becomes loose, convenience and efficiency are achieved, especially a narrow pipe row space can be effectively detected in place, and the detecting efficiency is greatly improved.
Description
Technical field
The invention belongs to the cannot-harm-detection device, be specifically related to ferromagnetism thing deposition pick-up unit in austenitic stainless steel elbow for a kind of boiler.
Background technology
Newly-built station boiler, in process of construction, because the ferromagnetism things such as the iron filings that produce in manufacture, installation, trial run process, lens, oxide easily are retained in heating surface tube, forms obstruction in pipe in throttle orifice and bend pipe; In-service boiler tubes of power plant in use also there will be serious steam side oxide skin to peel off usually; the oxide skin of peeling off also easily forms and stops up in throttle orifice or bend pipe in boiler tube; thereby the boiler tube temperature of stopping up sharply rises and 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 ferromagnetism thing deposition/accumulating amount in boiler tube.And the measurement of at present the ferromagnetism things such as oxide skin, iron filings in throttle orifice in boiler tube or bend pipe deposition being stopped up generally adopts ray instrument to detect, due to the restriction that is subject to site space, implement the method difficulty larger and easily undetected, and, because ray is larger to the harm of human body, affect carrying out smoothly of other service works.
Summary of the invention
The purpose of this invention is to provide a kind of be not subject to on-the-spot restriction, easy to use, detect ferromagnetism thing deposition pick-up unit in austenitic stainless steel elbow for the boiler effective, that efficiency is high.
The technical scheme that realizes the object of the invention employing is as follows:
Ferromagnetism thing deposition pick-up unit in austenitic stainless steel elbow for boiler provided by the invention, comprise detection probe, magnetic flux integrator, drift adjustment System, CPU (central processing unit) (CPU) and output display system (A/D conversion); Wherein said detection probe output terminal is connected with magnetic flux integrator input end, the magnetic flux integrator output terminal is connected with the CPU (central processing unit) input end and connects with the drift adjustment System, and CPU (central processing unit) (CPU) output terminal is connected with output display system (A/D conversion).
Described drift adjustment System adopts digital to analog converter DAC, resistance R 2 and resistance R 3 to form the automatic regulating float shift circuit, wherein DAC is connected with an end of resistance R 2, the other end of resistance R 2 is connected with the magnetic flux integrator with an end of resistance R 3, the other end ground connection of resistance R 3.
The principle of the invention is: by producing excitation field in detection probe, to forming magnetic conductive loop in detected object, in detection probe, magnetic test coil is for flux detection, because austenitic stainless steel is paramagnetism, magnetoconductivity is close to the magnetoconductivity of air, and the magnetic circuit that probe forms can not change, and does not have induced signal in magnetic test coil, if the ferromagnetism thing is arranged (as oxide skin in stainless-steel tube, iron filings, ferrite type bloom etc.), because the ferromagnetism thing is ferromagnetism, the interior magnetoconductivity of pipe is much larger than the magnetoconductivity of air, the magnetic resistance of the magnetic conductive loop that probe forms reduces, can produce induced signal in coil, the magnetic induction density of magnetic test coil detection signal and excitation field and to detect the area (forming the area of magnetic conductive loop) of the ferromagnetism thing of deposition in stainless steel relevant, under even excitation field, in magnetic test coil, magnetic flux is directly proportional to the area (forming the area of magnetic conductive loop) of the ferromagnetism thing that detects the interior deposition of stainless steel.By setting up the funtcional relationship between ferromagnetism thing deposition and magnetic test coil magnetic flux in stainless steel elbow, suitable integrator range is set, calibrate the coefficient that corresponding range is corresponding with quality, just can measure very accurately ferromagnetism thing deposition in stainless-steel tube.
In the detected object stainless steel elbow during deposited iron Magnetic Materials, detection probe of the present invention is contacted with the bend pipe bottom, utilize the formed magnetic conductive loop of ferromagnetism thing in bend pipe, the interior magnetic test coil of detection probe produces the induced signal of magnetic flux, input in the magnetic flux integrator, the major function of magnetic flux integrator is that the weak voltage signals of magnetic detection probe induction is converted to and can carries out the analog voltage of accurately measuring, and the magnetic flux integrator output voltage is directly proportional to detection probe flux sensing signal.Because the magnetic flux integrator easily produces drift, by the drift adjustment System, drift is compensated, eliminate the impact of the drift of the lower magnetic flux integrator data that work long hours.Output voltage is inputted into central processing unit (CPU) 4 and is carried out data storage, processing etc., then carries out simulating signal by output display system (A/D conversion) 5 and change to digital signal, output display.
The magnetic flux integrator is to use one of the most general surveying instrument in the magnetic survey field, and its effect is that the weak voltage signals of magnetic detection probe induction is converted to and can carries out the analog voltage of accurately measuring.
The invention has the beneficial effects as follows: during use without pipeline outer wall is carried out to special processing, can carry out Non-Destructive Testing to the ferromagnetism thing in stainless steel elbow, automatically eliminated the impact of drift, make measurement data accurate, there are simple, safe, reliable, highly sensitive characteristics, therefore loose to the environmental requirement detected, and convenient and swift, especially can both effectively detect and put in place emptying of narrow and small pipe, thereby improve detection efficiency significantly.The present invention is applicable to the detection to ferromagnetism thing deposition/accumulating amounts such as the oxide skin in the austenitic stainless steel material heating surface tube of large-sized boiler, iron filings.
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing.
The accompanying drawing explanation
Fig. 1 is the structured flowchart of a specific embodiment of apparatus of the present invention.
Fig. 2 be in apparatus of the present invention the magnetic flux integrator with the drift adjustment System the series circuit reference diagram.
Embodiment
Referring to Fig. 1, ferromagnetism thing deposition pick-up unit in austenitic stainless steel elbow for boiler provided by the invention, comprise detection probe 1, magnetic flux integrator 2, drift adjustment System 3, CPU (central processing unit) (CPU) 4 and output display system (A/D conversion) 5; Wherein said detection probe 1 output terminal is connected with magnetic flux integrator 2 input ends, magnetic flux integrator 2 output terminals are connected with CPU (central processing unit) (CPU) 4 input ends and connect with drift adjustment System 3, and CPU (central processing unit) (CPU) 4 output terminals are connected with output display system (A/D conversion) 5.
In apparatus of the present invention, it is CN201210449544.7 that detection probe 1 adopts publication number, and name is called " a kind of probe that detects ferromagnetism thing deposition in heating surface tubes in boilers " disclosed probe of patent documentation; The magnetic flux integrator 2 of its coupling adopts conventional RC formula integrator; Drift adjustment System 3(is referring to Fig. 2), adopt digital to analog converter DAC, resistance R 2 and resistance R 3 to form the automatic regulating float shift circuit, wherein DAC is connected with an end of resistance R 2, and the other end of resistance R 2 is connected with the magnetic flux integrator with an end of resistance R 3, the other end ground connection of resistance R 3.Because there is input offset voltage in amplifier, while not doing compensation, magnetic flux integrator 2 can be with speed drift faster, impact is measured, adopt digital mode to realize digital gain and drift value adjustment, DAC is exactly the automatic adjustment for integrator 2 drifts, and the DAC of employing is AD5621, be 12,6 pin SC70 encapsulation.The drift adjustment System 3 with RC formula integrator 2, be connected, its principle of work and electrical schematic diagram as shown in Figure 2, wherein: the detecting coil that n is detection probe; R1, C is respectively integrating resistor, electric capacity; DAC, R2 and R3 form automatic regulating float shift circuit, the adjustment System 3 of drifting about; When the magnetic flux in the detecting coil of detection probe 1 changes, coil n two ends induced voltage is e, and induced voltage e is by 1 pair of capacitor C integration of resistance R, and the magnetic flux that integrator output voltage is crossed detecting coil to chain is directly proportional, and scale-up factor is 1/RC.CPU (central processing unit) (CPU) 4 has adopted the STM32F100C8 processor of 32; Output display system (A/D conversion) 5 has adopted the ADC chip of 24 AD7799, there are 3 analog input channels, in application, a passage, for transition detection associated magnetic flux signal (A/D conversion), carries out the numeral demonstration of data by the Embedded LED of routine.
Claims (2)
1. a ferromagnetism thing deposition pick-up unit in austenitic stainless steel elbow for boiler, is characterized in that comprising detection probe, magnetic flux integrator, drift adjustment System, CPU (central processing unit) (CPU) and output display system (A/D conversion); Wherein said detection probe output terminal is connected with magnetic flux integrator input end, the magnetic flux integrator output terminal is connected with the CPU (central processing unit) input end and connects with the drift adjustment System, and CPU (central processing unit) (CPU) output terminal is connected with output display system (A/D conversion).
2. ferromagnetism thing deposition pick-up unit in austenitic stainless steel elbow for boiler according to claim 1, it is characterized in that described drift adjustment System adopts digital to analog converter DAC, resistance R 2 and resistance R 3 to form the automatic regulating float shift circuit, wherein DAC is connected with an end of resistance R 2, the other end of resistance R 2 is connected with the magnetic flux integrator with an end of resistance R 3, the other end ground connection of resistance R 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310354534XA CN103439401A (en) | 2013-08-15 | 2013-08-15 | Device for detecting deposition amount of ferromagnetic matter in austenite stainless steel bent tube for boiler |
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| CN201310354534XA CN103439401A (en) | 2013-08-15 | 2013-08-15 | Device for detecting deposition amount of ferromagnetic matter in austenite stainless steel bent tube for boiler |
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| CN103439401A true CN103439401A (en) | 2013-12-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122639A (en) * | 2007-09-19 | 2008-02-13 | 北京科技大学 | Austenitic stainless steel tube inner oxide magnetic damage-free detection device |
| CN101762230A (en) * | 2010-01-11 | 2010-06-30 | 广东电网公司电力科学研究院 | Measuring device of oxide in metal tube based on bipolar magnetic probe |
| CN102235997A (en) * | 2010-05-06 | 2011-11-09 | 陈丙国 | Probe for detecting oxides in austenitic pipe |
| CN102901769A (en) * | 2012-11-12 | 2013-01-30 | 湖南省湘电锅炉压力容器检验中心有限公司 | Probe for detecting ferromagnetic substance deposition in heated surface pipe of boiler |
| US20130111999A1 (en) * | 2010-05-05 | 2013-05-09 | Gerd Dobmann | Method and device for non-destructive material testing by means of ultrasound |
| CN203519557U (en) * | 2013-08-15 | 2014-04-02 | 湖南省湘电锅炉压力容器检验中心有限公司 | Deposition rate detection device for ferromagnetic matters in austenitic stainless steel bent pipe of boiler |
-
2013
- 2013-08-15 CN CN201310354534XA patent/CN103439401A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122639A (en) * | 2007-09-19 | 2008-02-13 | 北京科技大学 | Austenitic stainless steel tube inner oxide magnetic damage-free detection device |
| CN101762230A (en) * | 2010-01-11 | 2010-06-30 | 广东电网公司电力科学研究院 | Measuring device of oxide in metal tube based on bipolar magnetic probe |
| US20130111999A1 (en) * | 2010-05-05 | 2013-05-09 | Gerd Dobmann | Method and device for non-destructive material testing by means of ultrasound |
| CN102235997A (en) * | 2010-05-06 | 2011-11-09 | 陈丙国 | Probe for detecting oxides in austenitic pipe |
| CN102901769A (en) * | 2012-11-12 | 2013-01-30 | 湖南省湘电锅炉压力容器检验中心有限公司 | Probe for detecting ferromagnetic substance deposition in heated surface pipe of boiler |
| CN203519557U (en) * | 2013-08-15 | 2014-04-02 | 湖南省湘电锅炉压力容器检验中心有限公司 | Deposition rate detection device for ferromagnetic matters in austenitic stainless steel bent pipe of boiler |
Non-Patent Citations (1)
| Title |
|---|
| 孟奇等: "积分器系统在软磁合金磁性测量中的应用", 《计量技术》, no. 5, 31 May 2007 (2007-05-31), pages 19 - 21 * |
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Inventor after: Xie Guosheng Inventor after: Long Huiguo Inventor after: Long Yi Inventor after: Xie Yudong Inventor after: Chen Hongdong Inventor before: Xie Guosheng Inventor before: Long Huiguo Inventor before: Long Yi Inventor before: Chen Hongdong |
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Application publication date: 20131211 |