CN112014539A - Method for monitoring service life loss state of boiler tube - Google Patents
Method for monitoring service life loss state of boiler tube Download PDFInfo
- Publication number
- CN112014539A CN112014539A CN202010717635.9A CN202010717635A CN112014539A CN 112014539 A CN112014539 A CN 112014539A CN 202010717635 A CN202010717635 A CN 202010717635A CN 112014539 A CN112014539 A CN 112014539A
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- pipeline
- wall
- electric telescopic
- telescopic rod
- compression
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/204—Structure thereof, e.g. crystal structure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
Abstract
The invention belongs to the technical field of boiler pipeline detection, and particularly discloses a boiler tube life loss state monitoring method, which comprises the following steps of S1: taking a long straight pipeline to be detected, acquiring a predicted value T of the service life of the pipeline and an initial value H of the thickness of the inner wall of the pipeline, cleaning and airing the inner wall and the outer wall of the pipeline, and removing dust on the surface of the pipeline; s2: the scraping device extends into the inner wall of the pipeline to be tested, rust at multiple positions on the inner wall of the pipeline is scraped by the scraping device, the extending distance of the electric telescopic rod is transmitted to the display to be displayed by the displacement sensor, and the standard value of the displacement sensor is set by an operator through the PLC; s3: cleaning and airing the pipeline subjected to rust removal in the step S2 to remove the removed rust; s4: the grinding wheel on the scraping device is provided with the inner core, then the scraping device is moved into the pipeline to be measured again, and the thickness of the inner wall of the pipeline can be estimated by using the inner core and the piezoelectric sensor.
Description
Technical Field
The invention relates to a method for monitoring the service life loss state of a boiler tube, and belongs to the technical field of boiler tube detection.
Background
Boiler tube is after using for a long time, the phenomenon of corrosion appears at the pipeline inner wall to lead to the pipeline inner wall attenuation, when the pipeline inner wall is thin to a certain extent, just need change the pipeline, current boiler tube has special maintenance personal to carry out periodic monitoring to it in the use, guarantees boiler tube's safety, but the maintenance personal can't monitor the consume state in the life-span of pipeline, thereby can't the in service behavior of understanding this pipeline directly perceivedly.
Disclosure of Invention
The present invention is directed to a method for monitoring a state of boiler tube life loss, so as to solve the problems of the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for monitoring the service life loss state of a boiler tube comprises the following steps:
s1: taking a long straight pipeline to be detected, acquiring a predicted value T of the service life of the pipeline and an initial value H of the thickness of the inner wall of the pipeline, cleaning and airing the inner wall and the outer wall of the pipeline, and removing dust on the surface of the pipeline;
s2: the scraping device extends into the inner wall of the pipeline to be detected, the rotating speed of the scraping device is controlled to be 900 plus 1400rpm/min, rust on multiple positions of the inner wall of the pipeline is scraped by the scraping device, the extending distance of the electric telescopic rod can be transmitted to the display to be displayed by the displacement sensor, and an operator sets the standard value of the displacement sensor through the PLC;
s3: controlling the scraping device to move out of the pipeline to be tested, cleaning and airing the pipeline with the rust removed in S2, and removing the removed rust;
s4: the position of scraping rust on the inner wall of the pipeline can be calculated according to the extension distance of the electric telescopic rod in the S2, the position corresponding to the outer wall of the pipeline is marked, a piezoelectric sensor is arranged at the marked position, the piezoelectric sensor is connected with external equipment, and a calculation formula is shown as follows: the distance between every two adjacent grinding wheels is equal to L/(N +1), L is the length of the electric telescopic rod after being stretched, and N is the number of positions on the electric telescopic rod where the grinding wheels are arranged;
s5: arranging the inner core on the surface of the grinding wheel, moving the scraping device into the pipeline to be tested again, ensuring that the length of the electric telescopic rod after being extended is the same as that in S2, transmitting a piezoelectric pulse signal to the inner core by using the piezoelectric sensor, transmitting a back-pressure electric pulse signal to the piezoelectric sensor by the inner core, and deducing the thickness value of the inner wall of the pipeline at the position by external equipment according to the back-pressure electric pulse signal; and averaging the measured inner wall thickness values of the plurality of pipelines by M, and then deducing the service life loss S of the pipeline to be measured as (1-M/H) multiplied by T.
Preferably, scraping device is including removing base, driving motor, electric telescopic handle, compression subassembly and sanding wheel, it is fixed with driving motor on the base to remove, and driving motor's output is fixed with the output shaft, is fixed with first connecting plate on the output shaft, is fixed with electric telescopic handle on the first connecting plate, and electric telescopic handle's end is fixed with the second connecting plate, is provided with displacement sensor on the second connecting plate.
Preferably, the electric telescopic handle is equidistantly provided with a compression assembly, the compression assembly comprises a compression cylinder, a compression rod is slidably arranged in the compression cylinder, a polishing wheel is arranged on the compression rod, and the compression rod is connected with the bottom of the inner side of the compression cylinder through a spring.
Preferably, the inner wall of the compression cylinder is provided with a limiting sliding groove, two sides of the compression rod are fixed with limiting sliding blocks, and the limiting sliding blocks are connected with the limiting sliding groove in a sliding mode.
Preferably, the electric telescopic rod is provided with an illuminating lamp and a camera respectively at two sides of the compression assembly; a display and a PLC are arranged on the movable base; the displacement sensor and the camera are electrically connected with the display; and the displacement sensor and the electric telescopic rod are electrically connected with the PLC.
Preferably, the displacement sensor is used for measuring the length of the electric telescopic rod after the electric telescopic rod extends; the PLC controller is used for controlling the whole length of the electric telescopic rod after being extended.
Preferably, the inner core is made of wear-resistant materials.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a method for monitoring the service life loss state of a boiler tube, which comprises the steps of scraping rust on multiple positions of the inner wall of a pipeline to be detected by a scraping device, measuring the average value of the thicknesses of the inner wall of the pipeline after the rust is scraped by using a piezoelectric sensor and an inner core, and obtaining the service life loss of the pipeline to be detected according to a calculation formula S (1-M/H) multiplied by T by using a predicted value T of the service life of the pipeline and an initial value H of the thickness of the inner wall of the pipeline; therefore, the boiler pipeline service condition can be visually known by the maintainers, and the maintainers can overhaul and replace the boiler pipeline in time.
Drawings
FIG. 1 is a schematic view of a scraping device according to the present invention;
fig. 2 is an enlarged view of a portion a in fig. 1.
In the figure: 1. moving the base; 2. a drive motor; 3. an electric telescopic rod; 4. grinding the wheel; 5. a first connecting plate; 6. a second connecting plate; 7. a displacement sensor; 8. a compression cylinder; 801. a limiting chute; 9. a compression rod; 10. a spring; 11. a limiting slide block; 12. an illuminating lamp; 13. a camera; 14. a display; 15. a PLC controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1-2, the present invention provides a technical solution: a method for monitoring the service life loss state of a boiler tube comprises the following steps:
s1: taking a long straight pipeline to be detected, acquiring a predicted value T of the service life of the pipeline and an initial value H of the thickness of the inner wall of the pipeline, cleaning and airing the inner wall and the outer wall of the pipeline, and removing dust on the surface of the pipeline;
s2: the scraping device extends into the inner wall of the pipeline to be detected, the rotating speed of the scraping device is controlled to be 900 plus 1400rpm/min, rust at multiple positions on the inner wall of the pipeline is scraped by the scraping device, the extending distance of the electric telescopic rod 3 is transmitted to a display by the displacement sensor 7 to be displayed, and an operator sets the standard value of the displacement sensor 7 through the PLC 15;
s3: controlling the scraping device to move out of the pipeline to be tested, cleaning and airing the pipeline with the rust removed in S2, and removing the removed rust;
s4: the position of scraping rust on the inner wall of the pipeline can be calculated according to the extension distance of the electric telescopic rod 3 in the S2, the corresponding position of the outer wall of the pipeline is marked, a piezoelectric sensor is arranged at the marked position, the piezoelectric sensor is connected with external equipment, and a calculation formula is shown as follows: x is L/(N +1), X is the distance between adjacent grinding wheels 4, L is the extended length of the electric telescopic rod 3, and N is the number of positions on the electric telescopic rod 3 where the grinding wheels 4 are arranged;
s5: arranging the inner core on the surface of the grinding wheel 4, moving the scraping device into the pipeline to be measured again, ensuring that the length of the electric telescopic rod 3 after being extended is the same as that in S2, transmitting a piezoelectric pulse signal to the inner core by using a piezoelectric sensor, transmitting a back-pressure electric pulse signal to the piezoelectric sensor by the inner core, and deducing the thickness value of the inner wall of the pipeline according to the back-pressure electric pulse signal by external equipment; and averaging the measured inner wall thickness values of the plurality of pipelines by M, and then deducing the service life loss S of the pipeline to be measured as (1-M/H) multiplied by T.
Further, scraping device is including removing base 1, driving motor 2, electric telescopic handle 3, compression subassembly and the wheel 4 of polishing, remove and be fixed with driving motor 2 on the base 1, driving motor 2's output is fixed with the output shaft, is fixed with first connecting plate 5 on the output shaft, is fixed with electric telescopic handle 3 on the first connecting plate 5, and electric telescopic handle 3's end is fixed with second connecting plate 6, is provided with displacement sensor 7 on the second connecting plate 6.
Further, the electric telescopic handle 3 is last to be provided with the compression subassembly at equidistant, and the compression subassembly includes a compression section of thick bamboo 8, and it is provided with compression rod 9 to slide in the compression section of thick bamboo 8, sets up grinding wheel 4 on the compression rod 9, and compression rod 9 passes through spring 10 and is connected with the inboard bottom of a compression section of thick bamboo 8.
Furthermore, the inner wall of the compression cylinder 8 is provided with a limiting sliding groove 801, two sides of the compression rod 9 are fixed with limiting sliding blocks 11, and the limiting sliding blocks 11 are slidably connected with the limiting sliding groove 801.
Furthermore, an illuminating lamp 12 and a camera 13 are respectively arranged on the two sides of the electric telescopic rod 3, which are positioned on the compression component; a display 14 and a PLC (programmable logic controller) 15 are arranged on the mobile base 1; the displacement sensor 7 and the camera 13 are electrically connected with the display 14; and the displacement sensor 7 and the electric telescopic rod 3 are electrically connected with the PLC 15.
Further, the displacement sensor 7 is used for measuring the length of the electric telescopic rod 3 after being extended; the PLC controller 15 is used to control the overall length of the electric telescopic rod 3 after extension.
Furthermore, the inner core is made of wear-resistant materials.
The working principle is as follows: the invention relates to a method for monitoring the service life loss state of a boiler pipe, which comprises the following steps of firstly cleaning dust on the surface and the inner wall of a boiler pipe to be tested; then starting the electric telescopic rod 3 to enable the polishing wheel 4 to move into the pipeline to be tested until the tail end of the electric telescopic rod 3 is flush with the tail end of the pipeline to be tested; the displacement sensor 7 transmits the length value of the electric telescopic rod 3 after being stretched to the display 14 for displaying; the operator sets the length value as the standard value of the electric telescopic rod 3 through the PLC 15, and simultaneously according to a calculation formula: calculating the position of the pipeline inner wall where rust is scraped off by X/(N +1), marking the position on the outer wall of the pipeline, and arranging a piezoelectric sensor at the marked position, wherein the piezoelectric sensor is connected with external equipment; then the driving motor 2 is started, the driving motor 2 drives the electric telescopic rod 3 to rotate so as to drive the polishing wheel 4 to do circular motion along the inner wall of the pipeline to be tested, polishing operation is carried out on multiple positions of the inner wall of the pipeline, further, rust on the inner wall of the pipeline can be polished off, an operator can display the polishing state of the inner wall of the pipeline through the display 14, when the rust cannot be seen during polishing, the driving motor 2 is stopped, then the electric telescopic rod 3 is started again, the polishing wheel 4 is made to move out of the pipeline to be tested, the pipeline to be tested and the polishing wheel 4 are cleaned, the rust polished off on the inner wall of the pipeline to be tested is cleaned, then an inner core is bonded on the surface of the polishing wheel 4, the PLC 15 controls the electric telescopic rod 3 to move into the pipeline to be tested according to a set standard value, and the whole length of the electric telescopic rod 3 after being extended is ensured, ensuring that the grinding wheel 4 can move to the grinding position again, enabling the inner core to be in contact with the grinding position, transmitting a piezoelectric pulse signal to the inner core through the piezoelectric sensor, reflecting a back-pressure electric pulse signal to the piezoelectric sensor by the inner core, transmitting the back-pressure electric pulse signal to external equipment by the piezoelectric sensor, deducing the thickness value of the inner wall of the pipeline after grinding by the external equipment according to the back-pressure electric pulse signal, taking the average value (reduced error) of the thickness values of the inner wall of the pipeline at multiple positions, and obtaining the service life loss of the pipeline to be measured through a calculation formula S ═ 1-M/H (multiplied; therefore, the boiler pipeline service condition can be visually known by the maintainers, and the maintainers can overhaul and replace the boiler pipeline in time.
It is worth noting that: the whole device realizes control over the device through the master control button, and the device matched with the control button is common equipment, belongs to the existing mature technology, and is not repeated for the electrical connection relation and the specific circuit structure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for monitoring the service life loss state of a boiler tube is characterized in that: the method comprises the following steps:
s1: taking a long straight pipeline to be detected, acquiring a predicted value T of the service life of the pipeline and an initial value H of the thickness of the inner wall of the pipeline, cleaning and airing the inner wall and the outer wall of the pipeline, and removing dust on the surface of the pipeline;
s2: enabling the scraping device to extend into the inner wall of the pipeline to be detected, controlling the rotating speed of the scraping device to be at 900-1400rpm/min, scraping rust at multiple positions on the inner wall of the pipeline through the scraping device, transmitting the extension distance of the electric telescopic rod (3) to a display for displaying through the displacement sensor (7), and setting the standard value of the displacement sensor (7) by an operator through the PLC (15);
s3: controlling the scraping device to move out of the pipeline to be tested, cleaning and airing the pipeline with the rust removed in S2, and removing the removed rust;
s4: according to the extension distance of the electric telescopic rod (3) in the S2, the position of scraping rust on the inner wall of the pipeline can be calculated, the corresponding position of the outer wall of the pipeline is marked, a piezoelectric sensor is arranged at the marked position, the piezoelectric sensor is connected with external equipment, and a formula is calculated: x is L/(N +1), X is the distance between adjacent polishing wheels (4), L is the extended length of the electric telescopic rod (3), and N is the number of positions on the electric telescopic rod (3) where the polishing wheels (4) are arranged;
s5: arranging the inner core on the surface of the grinding wheel (4), moving the scraping device into the pipeline to be measured again, ensuring that the length of the electric telescopic rod (3) after being extended is the same as that in S2, transmitting a piezoelectric pulse signal to the inner core by using the piezoelectric sensor, transmitting a back-pressure electric pulse signal to the piezoelectric sensor by the inner core, and deducing the thickness value of the inner wall of the pipeline at the position by external equipment according to the back-pressure electric pulse signal; and averaging the measured inner wall thickness values of the plurality of pipelines by M, and then deducing the service life loss S of the pipeline to be measured as (1-M/H) multiplied by T.
2. The method for monitoring the state of wear of boiler tubes as set forth in claim 1, wherein: scraping device is including removing base (1), driving motor (2), electric telescopic handle (3), compression subassembly and sanding wheel (4), be fixed with driving motor (2) on removing base (1), the output of driving motor (2) is fixed with the output shaft, is fixed with first connecting plate (5) on the output shaft, is fixed with electric telescopic handle (3) on first connecting plate (5), and the end of electric telescopic handle (3) is fixed with second connecting plate (6), is provided with displacement sensor (7) on second connecting plate (6).
3. The method for monitoring the state of wear of boiler tubes as set forth in claim 2, wherein: the electric telescopic rod (3) is provided with compression assemblies at equal intervals, each compression assembly comprises a compression cylinder (8), a compression rod (9) is arranged in each compression cylinder (8) in a sliding mode, a polishing wheel (4) is arranged on each compression rod (9), and each compression rod (9) is connected with the bottom of the inner side of each compression cylinder (8) through a spring (10).
4. The method of claim 3, wherein the method comprises the steps of: the inner wall of the compression cylinder (8) is provided with a limiting sliding groove (801), limiting sliding blocks (11) are fixed on two sides of the compression rod (9), and the limiting sliding blocks (11) are in sliding connection with the limiting sliding groove (801).
5. The method for monitoring the state of wear of boiler tubes as set forth in claim 2, wherein: an illuminating lamp (12) and a camera (13) are respectively arranged on the two sides of the electric telescopic rod (3) which are positioned on the compression component; a display (14) and a PLC (programmable logic controller) (15) are arranged on the movable base (1); the displacement sensor (7) and the camera (13) are electrically connected with the display (14); the displacement sensor (7) and the electric telescopic rod (3) are electrically connected with the PLC (15).
6. The method for monitoring the state of wear of boiler tubes as set forth in claim 2, wherein: the displacement sensor (7) is used for measuring the length of the electric telescopic rod (3) after being extended; the PLC (15) is used for controlling the whole length of the electric telescopic rod (3) after being extended.
7. The method for monitoring the state of wear of boiler tubes as set forth in claim 1, wherein: the inner core is made of wear-resistant materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010717635.9A CN112014539A (en) | 2020-07-23 | 2020-07-23 | Method for monitoring service life loss state of boiler tube |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010717635.9A CN112014539A (en) | 2020-07-23 | 2020-07-23 | Method for monitoring service life loss state of boiler tube |
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Cited By (1)
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| CN115338206A (en) * | 2022-08-12 | 2022-11-15 | 中冶赛迪技术研究中心有限公司 | Automatic ash removal device for horizontal cylindrical dust removal pipeline |
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| CN115338206B (en) * | 2022-08-12 | 2024-01-26 | 中冶赛迪技术研究中心有限公司 | Automatic ash removing device for horizontal cylindrical dust removing pipeline |
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