CN203519557U - Deposition rate detection device for ferromagnetic matters in austenitic stainless steel bent pipe of boiler - Google Patents
Deposition rate detection device for ferromagnetic matters in austenitic stainless steel bent pipe of boiler Download PDFInfo
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- CN203519557U CN203519557U CN201320497119.5U CN201320497119U CN203519557U CN 203519557 U CN203519557 U CN 203519557U CN 201320497119 U CN201320497119 U CN 201320497119U CN 203519557 U CN203519557 U CN 203519557U
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Abstract
The utility model discloses a deposition rate detection device for ferromagnetic matters in an austenitic stainless steel bent pipe of a boiler. The deposition rate detection device comprises a detection probe, a magnetic flux integrator, a drifting adjustment system, a central processing unit (CPU) and an output display system (A/D (Analog to Digital) conversion), wherein the output end of the detection 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 CPU and is in series connection with the drifting adjustment system, and the output end of the CPU is connected with the output display system (A/D conversion). According to the deposition rate detection device, the ferromagnetic matters in the austenitic stainless steel bent pipe can be subjected to nondestructive testing without carrying out the special processing on the outer wall of a pipeline in a use process, so that the influence of drifting is automatically eliminated, and measured data is accurate; the deposition rate detection device has the characteristics of simplicity, safety, reliability and high sensitivity, has low requirements on a detection environment, is convenient and rapid and particularly can be used for effectively and completely detecting narrow spaces of tube rows, and the detection efficiency is greatly increased.
Description
Technical field
The utility model belongs to the cannot-harm-detection device, is 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 are easily 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 conventionally; 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 thing depositions such as oxide skin, iron filings in throttle orifice in boiler tube or bend pipe being stopped up generally adopts ray instrument to detect, owing to being subject to the restriction of 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.
Utility model content
The purpose of this utility model be 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, efficiency is high.
The technical scheme that realizes the employing of the utility model object is as follows:
Ferromagnetism thing deposition pick-up unit in austenitic stainless steel elbow for the boiler that the utility model provides, comprises 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, magnetic flux integrator output terminal is connected with CPU (central processing unit) input end and connects with 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 automatic regulating float shift circuit, wherein DAC is connected with one end of resistance R 2, the other end of resistance R 2 is connected with magnetic flux integrator with one end of resistance R 3, the other end ground connection of resistance R 3.
The utility model principle 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 have ferromagnetism thing in stainless-steel tube (as oxide skin, iron filings, ferrite type bloom etc.), because 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, in coil, can produce induced signal, magnetic test coil detection signal is relevant with the area (forming the area of magnetic conductive loop) of the magnetic induction density of excitation field and the ferromagnetism thing of the interior deposition of detection stainless steel, under even excitation field, in magnetic test coil, magnetic flux is directly proportional to the area (forming the area of magnetic conductive loop) that detects the ferromagnetism thing of 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 detected object stainless steel elbow during deposited iron Magnetic Materials, detection probe of the present utility model is contacted with 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 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 accurately analog voltage of measurement, and magnetic flux integrator output voltage is directly proportional to detection probe flux sensing signal.Because magnetic flux integrator easily produces drift, by 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 by output display system (A/D conversion) 5, carries out simulating signal and change to digital signal, output display.
Magnetic flux integrator is in magnetic survey field, to use one of the most general surveying instrument, and its effect is that the weak voltage signals of magnetic detection probe induction is converted to and can carries out the analog voltage accurately measured.
The beneficial effects of the utility model are: 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 is simple, safe, reliable, highly sensitive feature, therefore loose to the environmental requirement detecting, and convenient and swift, especially emptying of narrow and small pipe can both effectively be detected and be put in place, thereby improve detection efficiency significantly.The utility model 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.
Below in conjunction with accompanying drawing, further illustrate the technical solution of the utility model.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a specific embodiment of the utility model device.
Fig. 2 be in the utility model device magnetic flux integrator with drift adjustment System series circuit reference diagram.
Embodiment
Referring to Fig. 1, ferromagnetism thing deposition pick-up unit in austenitic stainless steel elbow for the boiler that the utility model provides, comprises 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 the utility model device, 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 automatic regulating float shift circuit, wherein DAC is connected with one end of resistance R 2, and the other end of resistance R 2 is connected with magnetic flux integrator with one end of resistance R 3, the other end ground connection of resistance R 3.Because amplifier exists input offset voltage, while not compensating, 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.Drift adjustment System 3 be connected with RC formula integrator 2, 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, passage is for transition detection associated magnetic flux signal (A/D conversion), and the numeral that the Embedded LED by routine carries out data shows.
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) and output display system; Wherein said detection probe output terminal is connected with magnetic flux integrator input end, and magnetic flux integrator output terminal is connected with CPU (central processing unit) input end and connects with drift adjustment System, and CPU (central processing unit) output terminal is connected with output display system.
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 automatic regulating float shift circuit, wherein DAC is connected with one end of resistance R 2, the other end of resistance R 2 is connected with magnetic flux integrator with one end of resistance R 3, the other end ground connection of resistance R 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320497119.5U CN203519557U (en) | 2013-08-15 | 2013-08-15 | Deposition rate detection device for ferromagnetic matters in austenitic stainless steel bent pipe of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320497119.5U CN203519557U (en) | 2013-08-15 | 2013-08-15 | Deposition rate detection device for ferromagnetic matters in austenitic stainless steel bent pipe of boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203519557U true CN203519557U (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320497119.5U Expired - Lifetime CN203519557U (en) | 2013-08-15 | 2013-08-15 | Deposition rate detection device for ferromagnetic matters in austenitic stainless steel bent pipe of boiler |
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| Country | Link |
|---|---|
| CN (1) | CN203519557U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439401A (en) * | 2013-08-15 | 2013-12-11 | 湖南省湘电锅炉压力容器检验中心有限公司 | Device for detecting deposition amount of ferromagnetic matter in austenite stainless steel bent tube for boiler |
-
2013
- 2013-08-15 CN CN201320497119.5U patent/CN203519557U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439401A (en) * | 2013-08-15 | 2013-12-11 | 湖南省湘电锅炉压力容器检验中心有限公司 | Device for detecting deposition amount of ferromagnetic matter in austenite stainless steel bent tube for boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140402 |