CN215005115U - Device for detecting accumulated oxides in boiler heating surface tube - Google Patents
Device for detecting accumulated oxides in boiler heating surface tube Download PDFInfo
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- CN215005115U CN215005115U CN202120593966.6U CN202120593966U CN215005115U CN 215005115 U CN215005115 U CN 215005115U CN 202120593966 U CN202120593966 U CN 202120593966U CN 215005115 U CN215005115 U CN 215005115U
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Abstract
The utility model discloses an oxide detection device is piled up to boiler heating surface intraduct, including dynamic detector and integration probe, integration probe is connected with the dynamic detector electricity, and the integration probe includes the pure iron urceolus, is provided with magnetizing coil in the pure iron urceolus, and the interior upper portion of pure iron urceolus is provided with annular piezoelectric type pressure sensor, and piezoelectric type pressure sensor is located magnetizing coil's top. The dynamic detector comprises an electromagnet signal processing module and a piezoelectric signal processing module, wherein the electromagnet signal processing module is electrically connected with the magnetizing coil, and the piezoelectric signal processing module is electrically connected with the piezoelectric pressure sensor. The electromagnet signal processing module can linearly control the magnetic field intensity generated by the magnetizing coil, and the piezoelectric signal processing module can dynamically acquire the voltage value of the piezoelectric pressure sensor. The utility model discloses the realization is to the short-term test of the intraductal oxide accumulation volume of various heating surfaces, and detection efficiency is high, and the data accuracy is good, and application scope is wide.
Description
Technical Field
The utility model relates to a boiler receives the inside oxide detection area that piles up of surface, concretely relates to boiler receives the inside oxide detection device that piles up of surface.
Background
In recent years, with the large production of ultra (supercritical) thermal power generating units and the large application of new materials and new processes, a great number of power plants have been in succession to have the problem of steam side oxides on the inner walls of heating surfaces such as high-temperature superheaters and high-temperature reheaters of boilers, and the problem has gradually become a major frequent problem affecting the safe and stable operation of the thermal power generating units.
From the aspect of oxide generation, under the action of high-temperature steam, the generation of oxide on the steam side of the inner wall of the high-temperature heating surface of the power station unit is inevitable. In the process of operating the supercritical once-through boiler of the thermal power plant, the highest steam temperature can reach 550-600 ℃, the strong oxidation range of the steam is 450-700 ℃, the steam is just in the operating temperature range of the boiler, the steam is decomposed into hydrogen and oxygen atoms in the temperature range, and the product generated by the reaction of the hydrogen and oxygen atoms and the metal ions on the steam side wall of the inner wall of the heating surface of the boiler is oxide (Fe is used as the oxide)2O3、Fe3O4FeO, as the main component), the metal tube wall will be continuously oxidized with the continuation of the high-temperature high-pressure atmosphere, finally forming a large amount of oxides.
On one hand, from the viewpoint of oxide peeling, on the other hand, the expansion coefficients of widely used austenitic stainless steel materials, T91/92 materials and the like and the generated oxides thereof are greatly different, and large thermal stress is generated when the external temperature changes greatly; on the other hand, the frequent peak regulation of the power station unit, the start and stop caused by the frequent peak regulation and the change of the load at any time inevitably cause the change of the medium temperature, and the problems of oxide generation and peeling caused by the change of the medium temperature cannot be avoided.
Oxides are peeled off in the operation of a boiler or a start-stop furnace, and can be accumulated and even blocked at the bent pipes of the heating surfaces of the boiler, such as a high-temperature superheater, a high-temperature reheater and the like, and overtemperature pipe explosion is caused when the serious conditions are serious. For this purpose, the oxide accumulation inside the boiler heating surface tube is periodically detected, and whether treatment is required is determined according to the detection result.
The current detection methods include ray detection, ultrasonic detection and the like. The ray detection operation is complex, other operation processes are influenced, and the detection efficiency is low; during ultrasonic detection, water needs to be filled into the pipe at first, and operation is complex, so that the difficulty in detecting the oxide accumulation in the pipe is increased.
The publication number is: 108240850B, the core technology is to test the magnetic attraction of the permanent magnet to the sample tube with known oxide accumulation through the developed integrated pressure probe of the permanent magnet and the resistance film pressure sensor, to build the single value corresponding relation between the magnetic attraction and the oxide accumulation in the tube, to further realize the measurement of the actual oxide accumulation in the austenitic stainless steel tube. The method is simple to operate and high in detection efficiency, but the method is only suitable for non-ferromagnetic austenitic stainless steel tubes, and for ferromagnetic materials such as T91/92 and the like which are widely applied to the heating surface of a boiler, the method cannot detect the ferromagnetic materials based on an integrated probe developed by a permanent magnet; and the method does not consider the influence of the gravity of the probe on the test pressure value. The measured precision is not high, and the detection application range is limited.
SUMMERY OF THE UTILITY MODEL
To the inside problem of piling up the oxide detection existence of current boiler heating surface, the utility model provides a boiler heating surface is inside to pile up oxide detection device can be used to the detection of ferromagnetism, the intraductal oxide accumulation volume of non-ferromagnetism's boiler heating surface.
The utility model adopts the following technical proposal:
a device for detecting oxide accumulated in the interior of a boiler heating surface tube comprises a dynamic detector and an integrated probe, wherein the integrated probe is electrically connected with the dynamic detector and comprises a pure iron outer tube, a magnetizing coil is arranged in the pure iron outer tube, an annular piezoelectric pressure sensor is arranged at the upper inner part of the pure iron outer tube and positioned above the magnetizing coil;
the dynamic detector comprises an electromagnet signal processing module and a piezoelectric signal processing module, wherein the electromagnet signal processing module is electrically connected with the magnetizing coil, and the piezoelectric signal processing module is electrically connected with the piezoelectric pressure sensor;
the electromagnet signal processing module can linearly control the magnetic field intensity generated by the magnetizing coil, and the piezoelectric signal processing module can dynamically acquire the voltage value of the piezoelectric pressure sensor.
Preferably, the top end face of the piezoelectric pressure sensor is flush with the top end face of the pure iron outer cylinder.
Preferably, the top of the pure iron outer cylinder is covered with a flexible protective film, and the piezoelectric pressure sensor can be covered by the flexible protective film.
Preferably, the bottom of the magnetizing coil is provided with a power interface, and the power interface is electrically connected with the electromagnet signal processing module.
Preferably, the power interface is electrically connected with the electromagnet signal processing module through a power line.
Preferably, a piezoelectric signal interface is arranged on the piezoelectric pressure sensor, and the piezoelectric signal interface is electrically connected with the piezoelectric signal processing module.
Preferably, the piezoelectric signal interface is electrically connected with the piezoelectric signal processing module through a signal line.
Preferably, the magnetizing coil is made of pure red copper.
Preferably, the dynamic detector further comprises an oscilloscope, and the oscilloscope is connected with the piezoelectric signal processing module.
Preferably, the dynamic detector further comprises a power supply and a switch button.
The utility model has the advantages that:
the utility model provides a pair of oxide detection device is piled up to boiler heating surface intraduct, set up the integration probe, combine electromagnet and piezoelectric type pressure sensor, and realize the magnetic field intensity that linear control magnetizing coil produced and gather piezoelectric type pressure sensor's voltage value through electromagnet signal processing module and piezoelectric signal processing module, thereby establish the single value corresponding relation of magnetic attraction increment curve envelope area value and intraductal oxide accumulation, and then realize the short-term test to the intraductal oxide accumulation of various heating surfaces, the detection efficiency is high, the data accuracy is good, wide application scope.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
FIG. 1 is a top view of an integrated probe.
FIG. 2 is a cross-sectional view of an integrated probe.
Fig. 3 is a schematic view of the operation of the present invention.
1. An integrated probe; 2. a pure iron outer cylinder; 3. a magnetizing coil; 4. a power interface; 5. a piezoelectric pressure sensor; 6. an electrical signal interface; 7. a flexible protective film; 8. a heated face tube; 9. stacking an oxide; 10. a dynamic detector; 11. an oscilloscope; 12. a piezoelectric signal processing module; 13. an electromagnet signal processing module; 14. a power source; 15. a switch button; 16. a signal line; 17. a power line.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Under the action of high-temperature steam, the generated oxide components of the T91/92 tube are Fe in the forms of non-ferromagnetic austenitic stainless steel materials and ferromagnetic T91/92 tubes2O3、Fe3O4Mainly FeO and FeO. The oxide is ferromagnetic, and the distribution and content of the oxide in the tube can affect the magnetic properties of the whole tube.
From the theory of magnetization characteristics, it is known that the additional magnetic field excited by different substances after magnetization is different. After the ferromagnetic material is excited and magnetized, the generated additional magnetic field intensity is far greater than the excitation magnetic field intensity, so that the magnetic field can be obviously enhanced and the ferromagnetic material is strongly attracted by the excitation magnet. The larger the magnetic flux density inside the ferromagnetic material is, the larger the magnetic attraction force between the magnet and the material is, and the magnetic permeability, thickness, shape and the like of the material can influence the magnitude of the magnetic attraction force.
Utilize above-mentioned two points, the utility model discloses an exert plus excitation magnetic field, establish and receive the relevant magnetic characteristic relation of the inside ferromagnetic oxide magnetic attraction of surface to this content and the distribution of the inside oxide of judgement receiving surface.
Referring to fig. 1, the device for detecting oxide accumulated inside a boiler heating surface tube comprises a dynamic detector and an integrated probe 1, wherein the integrated probe 1 is electrically connected with a dynamic detector 10.
The integrated probe 1 comprises a pure iron outer cylinder 2, a magnetizing coil 3 is arranged in the pure iron outer cylinder, an annular piezoelectric pressure sensor 5 is arranged at the inner upper part of the pure iron outer cylinder, and the piezoelectric pressure sensor 5 is positioned above the magnetizing coil 3.
The top end surface of the piezoelectric pressure sensor 5 is flush with the top end surface of the pure iron outer cylinder 2.
The top of the pure iron outer cylinder 2 is covered with a flexible protective film 7 which can cover the piezoelectric pressure sensor.
The dynamic detector comprises an electromagnet signal processing module 13 and a piezoelectric signal processing module 12, wherein the electromagnet signal processing module 13 is electrically connected with the magnetizing coil 3, and the piezoelectric signal processing module 12 is electrically connected with the piezoelectric pressure sensor 5.
The electromagnet signal processing module can linearly control the magnetic field intensity generated by the magnetizing coil, and the piezoelectric signal processing module can dynamically acquire and process the voltage value of the piezoelectric pressure sensor.
The bottom of the magnetizing coil is provided with a power interface 4, and the power interface 4 is electrically connected with the electromagnet signal processing module 13.
Specifically, the power interface is electrically connected with the electromagnet signal processing module through a power line 17.
The piezoelectric pressure sensor is provided with a piezoelectric signal interface 6, and the piezoelectric signal interface is electrically connected with the piezoelectric signal processing module 12.
Specifically, the piezoelectric signal interface 6 is electrically connected to the piezoelectric signal processing module through a signal line 16.
The magnetizing coil is made of pure red copper, has strong electric conductivity and fast heat dissipation, and adopts a direct current working mode.
The dynamic detector also comprises an oscilloscope 11 which is connected with the piezoelectric signal processing module.
In addition, the dynamic monitor includes a power source 14 and a switch button 15.
The piezoelectric pressure sensor is made of a single crystal lithium iodate material.
Utilize the utility model discloses the process that detects the inside accumulational oxide accumulation of boiler heating surface pipe does:
and (3) switching on a power supply of the dynamic detector, contacting the integrated probe to the outer surface of the heated surface tube 8 to be detected, operating a switch button, electrifying the magnetizing coil by the electromagnet signal processing module, increasing the electrifying current from zero to the maximum linearly within a certain time T, and gradually increasing the intensity of the exciting magnetic field from zero to the saturation intensity. Under the action of the excitation magnetic field, the additional magnetic field intensity generated by the heated surface pipe to be detected and the accumulated oxide 9 in the heated surface pipe gradually increases from zero to saturation intensity. The magnetic attraction force between the integrated probe and the heated surface pipe to be detected is gradually increased from zero to the maximum value. Meanwhile, the piezoelectric signal processing module dynamically acquires a voltage value generated by the piezoelectric pressure sensor due to the magnetic attraction within the electrifying time T, and properly processes and amplifies the voltage value to generate a real-time magnetic attraction value (f) -T curve; and the curve can be derived to generate a real-time magnetic attraction increment-electrifying time (d (f) -t) curve. The influence of the self gravity of the probe on the magnetic attraction is a fixed value after the probe is in place, and the influence can be eliminated after the curve is derived. And after one-time dynamic pressure application is completed, the piezoelectric signal processing module outputs the value of the enveloping area of the magnetic attraction value-added curve.
The magnetic attraction value curve and the magnetic attraction value-added curve can be displayed on the oscilloscope in real time, and the piezoelectric signal processing module finally outputs the magnetic attraction value-added curve envelope area value. And obtaining the accumulation amount of the oxide of the heated surface pipe to be detected according to the value of the envelope area of the magnetic attraction increment curve.
The corresponding relation between the accumulation amount of the oxide and the value of the envelope area of the value-added curve of the magnetic attraction force can be obtained in advance through experiments.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (10)
1. The device for detecting the accumulated oxides in the interior of the heating surface pipe of the boiler is characterized by comprising a dynamic detector and an integrated probe, wherein the integrated probe is electrically connected with the dynamic detector and comprises a pure iron outer cylinder, a magnetizing coil is arranged in the pure iron outer cylinder, an annular piezoelectric pressure sensor is arranged at the upper inner part of the pure iron outer cylinder, and the piezoelectric pressure sensor is positioned above the magnetizing coil;
the dynamic detector comprises an electromagnet signal processing module and a piezoelectric signal processing module, wherein the electromagnet signal processing module is electrically connected with the magnetizing coil, and the piezoelectric signal processing module is electrically connected with the piezoelectric pressure sensor;
the electromagnet signal processing module can linearly control the magnetic field intensity generated by the magnetizing coil, and the piezoelectric signal processing module can dynamically acquire the voltage value of the piezoelectric pressure sensor.
2. The apparatus for detecting oxide buildup inside a boiler heating surface tube as set forth in claim 1, wherein a top end face of said piezoelectric pressure sensor is flush with a top end face of said pure iron outer tube.
3. The apparatus for detecting oxide accumulated inside a boiler heating surface tube according to claim 1, wherein the top of said pure iron outer tube is covered with a flexible protective film capable of covering the piezoelectric pressure sensor.
4. The device for detecting oxide accumulated inside a boiler heating surface tube according to claim 1, wherein a power interface is arranged at the bottom of the magnetizing coil and electrically connected with the electromagnet signal processing module.
5. The apparatus of claim 4, wherein the power interface is electrically connected to the electromagnet signal processing module via a power line.
6. The apparatus of claim 1, wherein the piezoelectric pressure sensor is provided with a piezoelectric signal interface, and the piezoelectric signal interface is electrically connected to the piezoelectric signal processing module.
7. The apparatus of claim 6, wherein the piezoelectric signal interface is electrically connected to the piezoelectric signal processing module via a signal line.
8. The apparatus as claimed in claim 1, wherein the magnetizing coil is made of pure red copper.
9. The apparatus of claim 1, wherein the dynamic detector further comprises an oscilloscope, and the oscilloscope is connected to the piezoelectric signal processing module.
10. The apparatus of claim 1, wherein the dynamic detector further comprises a power supply and a switch button.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120593966.6U CN215005115U (en) | 2021-03-24 | 2021-03-24 | Device for detecting accumulated oxides in boiler heating surface tube |
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| CN202120593966.6U CN215005115U (en) | 2021-03-24 | 2021-03-24 | Device for detecting accumulated oxides in boiler heating surface tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114643537A (en) * | 2022-03-14 | 2022-06-21 | 长沙矿冶研究院有限责任公司 | Automatic sand inspection device and method for sand supply tank of high-pressure water jet cleaning equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114643537A (en) * | 2022-03-14 | 2022-06-21 | 长沙矿冶研究院有限责任公司 | Automatic sand inspection device and method for sand supply tank of high-pressure water jet cleaning equipment |
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