CN117029759A - Boiler water-cooled wall deformation monitoring method, system and device based on strain measurement - Google Patents
Boiler water-cooled wall deformation monitoring method, system and device based on strain measurement Download PDFInfo
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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Abstract
The method, the system and the device for monitoring the deformation of the water-cooled wall of the boiler based on the strain measurement acquire the strain measurement values of the high-temperature strain gauges on the inner side and the outer side of the strip-shaped plate according to a preset time interval; calculating an actual disturbance value of the specified monitoring point by using strain measurement values of two high-temperature strain gauges of the specified monitoring point, and measuring the water-cooled wall plane by a mechanism that the water-cooled wall plane is bent after the water-cooled wall bulges, so as to detect the bending degree of the water-cooled wall plane; the traditional technology cannot realize on-line measurement of bulges due to the high temperature characteristic of the water-cooled wall, cannot know the severity of the bulges before the faults further evolve, and cannot extract and take method measures; the application can realize online measurement; the traditional technology is not accurate in obtaining the micro deformation of the water-cooled wall no matter the method of manual measurement or image identification, and the method for obtaining the high-temperature strain value has higher measurement precision, can amplify the micro deformation amount and is more beneficial to the identification of early deformation.
Description
Technical Field
The application belongs to the technical field of boiler monitoring, and particularly relates to a method, a system and a device for monitoring deformation of a boiler water wall based on strain measurement.
Background
At present, a boiler water cooling wall is a main heated part of a boiler and consists of a plurality of steel pipes which are arranged in parallel, wherein the pipes are welded and connected through thin plates and distributed around a boiler hearth to form a closed combustion space. The water wall pipe is filled with flowing water or steam, and the outside receives the heat of the flame of the boiler furnace. In operation, the flow distribution among the pipes of the water wall pipe often deviates from the design value due to the deposition of local blockage dirt or scale, so that the overheating phenomenon of part of the water wall pipe occurs, and when the temperature difference between adjacent pipes exceeds 50 ℃, the water wall is bulged, deformed and even broken due to the action of heat stress.
At present, due to the high-temperature environment in the boiler, the bulge deformation of the water-cooled wall is not easy to measure, and only after the boiler is stopped and cooled, the water-cooled wall enters the inner space of the boiler by an maintainer and is monitored by a visual inspection method. The method relying on manual monitoring cannot solve the problem at the beginning of deformation of the boiler, often causes further development of deformation, causes rupture and leakage of the water-cooled wall, and causes unplanned shutdown of the boiler.
Disclosure of Invention
Therefore, the application provides a strain measurement-based method, a strain measurement-based system and a strain measurement-based device for monitoring the deformation of the boiler water-cooling wall, which are used for realizing the on-line monitoring of the bulge deformation of the boiler water-cooling wall, determining the safety and the reliability of the boiler water-cooling wall from the early stage of failure, and solving the problems that the traditional method depends on manual work or needs to monitor after the boiler is stopped and the monitoring accuracy is low.
In order to achieve the above object, the present application provides the following technical solutions: in a first aspect, a method for monitoring deformation of a water-cooled wall of a boiler based on strain measurement is provided, comprising:
collecting strain measurement values of high-temperature strain gauges on the inner side and the outer side of the strip-shaped plate according to a preset time interval;
calculating the actual disturbance value of the appointed monitoring point by using the strain measurement values of the two high-temperature strain gauges of the appointed monitoring point;
the formula for calculating the disturbance degree value h of the appointed monitoring point is as follows:
wherein L is the distance between the pipelines; epsilon i The strain measurement value is the strain measurement value of the inner high-temperature strain gauge; epsilon o The strain measurement value is the strain measurement value of the outer high-temperature strain gauge; k is the neutral layer coefficient, K is defined by the bending inner diameter R i And inquiring the thickness delta of the plate to obtain; a is the strain measurement intermediate variable.
As a preferable scheme of the strain measurement-based boiler water wall deformation monitoring method, the iterative analysis is carried out on the actual disturbance value h of the designated monitoring point, and the iterative analysis steps comprise:
collecting strain measurement epsilon of outer high-temperature strain gauge i And inside high temperature strainSheet strain measurement epsilon o ；
Setting an initial value h of the disturbance degree 0 The method comprises the steps of carrying out a first treatment on the surface of the Calculating the curved inner diameter R using equation (3) i ；
By means of a curved inner diameter R i Inquiring the thickness delta of the plate to obtain a neutral layer coefficient K;
obtaining an iterative disturbance value h by using a formula (1) and a formula (2) 1 ；
Calculating an iterative disturbance value h 1 Initial value h of sum scrambling degree 0 Is a difference deltah;
judging whether the difference value delta h is smaller than the iteration end threshold delta 0 If the difference value delta h is smaller than the iteration end threshold delta 0 The iterative disturbance value h 1 As a disturbance value h specifying the monitoring point.
In a second aspect, the present application provides a strain measurement-based boiler water wall deformation monitoring system, which adopts the strain measurement-based boiler water wall deformation monitoring method of the first aspect or any possible implementation manner thereof, and comprises a water wall deformation measurement assembly, wherein the water wall deformation measurement assembly comprises strip-shaped plates connected to two water wall pipelines and deformed along with water wall bulges; high-temperature strain gauges are welded on the inner side and the outer side of the center of the strip-shaped plate;
the high-temperature strain gauge is connected with a strain acquisition instrument through a wire, and the strain acquisition instrument is used for acquiring a measured value of the high-temperature strain gauge; the strain acquisition instrument is connected with an engineer station, and the engineer station is used for judging the bulging deformation degree of the boiler water wall by utilizing the measured value of the high-temperature strain gauge.
As a preferable scheme of the boiler water wall deformation monitoring system based on strain measurement, a space exists between two water wall pipelines connected by the strip-shaped plate, and 3 to 6 water wall pipelines are arranged between the two water wall pipelines at intervals;
the direction of the strip-shaped plate is the horizontal direction, and the strip-shaped plate is positioned at the position of 2.0m above the burner.
As a preferable scheme of the boiler water wall deformation monitoring system based on strain measurement, the high-temperature strain gauge is welded at the middle position of the strip-shaped plate by a spot welding method, the number of welding spots in the long side direction of the high-temperature strain gauge is more than 20, and the number of welding spots in the short side direction of the high-temperature strain gauge is more than 10.
As a preferable scheme of the boiler water wall deformation monitoring system based on strain measurement, the measurement value of the high-temperature strain gauge is as follows:
and 1/2 of the difference between the high temperature strain gauge measurement value inside the central position of the strip-shaped plate and the high temperature strain gauge measurement value outside the central position of the strip-shaped plate.
As a preferable scheme of the boiler water wall deformation monitoring system based on strain measurement, finite element software is utilized to model the strip-shaped plate, a corresponding relation between the strain measurement value of the strip-shaped plate and the water wall bulge disturbance value is established, and the water wall bulge disturbance value is obtained through the corresponding relation between the strain measurement value and the water wall bulge disturbance value.
As a preferable scheme of the boiler water wall deformation monitoring system based on strain measurement, the water wall bulge disturbance value is monitored, and bulge alarm is carried out when the water wall bulge disturbance value exceeds a preset limit value.
In a third aspect, the present application provides a strain measurement-based boiler water wall deformation monitoring device, comprising:
the measured value acquisition module is used for acquiring strain measured values of the high-temperature strain gauges on the inner side and the outer side of the strip-shaped plate according to a preset time interval;
the disturbance degree value calculation module is used for calculating the actual disturbance degree value of the appointed monitoring point by utilizing the strain measurement values of the two high-temperature strain gauges of the appointed monitoring point;
the formula for calculating the disturbance degree value h of the appointed monitoring point is as follows:
wherein L is the distance between the pipelines; epsilon i The strain measurement value is the strain measurement value of the inner high-temperature strain gauge; epsilon o The strain measurement value is the strain measurement value of the outer high-temperature strain gauge; k is the neutral layer coefficient, K is defined by the bending inner diameter R i And inquiring the thickness delta of the plate to obtain; a is the strain measurement intermediate variable.
As a preferable scheme of the boiler water wall deformation monitoring device based on strain measurement, the device further comprises:
the iteration analysis module is used for carrying out iteration analysis on the actual disturbance value h of the appointed monitoring point;
the iteration analysis module utilizes the outer high-temperature strain gauge strain measurement epsilon acquired by the measurement acquisition module i And an inboard high temperature strain gauge strain measurement ε o ；
The iterative analysis module comprises:
a bending inner diameter calculation sub-module for setting a disturbance degree initial value h 0 The method comprises the steps of carrying out a first treatment on the surface of the Calculating the curved inner diameter R using equation (3) i ；
Neutral layer coefficient query submodule for utilizing curved inner diameter R i Inquiring the thickness delta of the plate to obtain a neutral layer coefficient K;
an iterative disturbance value calculation sub-module for obtaining an iterative disturbance value h by using the formula (1) and the formula (2) 1 ；
An iteration precision analysis sub-module for calculating an iteration disturbance value h 1 Initial value h of sum scrambling degree 0 Is a difference deltah;
an iteration end submodule for judging whether the difference value delta h is smaller than an iteration end threshold delta 0 If the difference value delta h is smaller than the iteration end threshold delta 0 The iterative disturbance value h 1 As a disturbance value h specifying the monitoring point.
The application has the beneficial effects that the bending degree of the water-cooled wall plane is detected by measuring the water-cooled wall plane through a mechanism that the water-cooled wall plane can be bent after the water-cooled wall bulges; the traditional technology cannot realize on-line measurement of bulges due to the high temperature characteristic of the water-cooled wall, cannot know the severity of the bulges before the faults further evolve, and cannot extract and take method measures; the application can realize online measurement; the traditional technology is not accurate in obtaining the micro deformation of the water-cooled wall no matter the method of manual measurement or image identification, and the method for obtaining the high-temperature strain value has higher measurement precision, can amplify the micro deformation amount and is more beneficial to the identification of early deformation.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the application, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present application, should fall within the scope of the application.
FIG. 1 is a flow chart of iterative processing of a strain measurement-based boiler water wall deformation monitoring method provided by an embodiment of the application;
FIG. 2 is a schematic diagram of a strain measurement-based boiler water wall deformation monitoring system according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a high temperature strain gauge installation plan of a strain measurement-based boiler water wall deformation monitoring system according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a high-temperature strain gauge installation side view of a boiler water wall deformation monitoring system based on strain measurement according to an embodiment of the present application;
FIG. 5 is a schematic diagram of welding high-temperature strain gauges of a boiler water wall deformation monitoring system based on strain measurement according to an embodiment of the present application;
FIG. 6 is a schematic diagram of deformation of a strip plate of a strain measurement-based boiler water wall deformation monitoring system according to an embodiment of the present application;
fig. 7 is a diagram of a boiler water wall deformation monitoring device based on strain measurement according to an embodiment of the present application.
Detailed Description
Other advantages and advantages of the present application will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the related art, a displacement sensor for detecting deformation of a membrane water wall is disclosed, and deformation of a pipeline is measured through three displacement sensors.
In the related art, a defect detection system, a method, equipment and a medium of the boiler water-cooling wall are also disclosed, wherein an unmanned aerial vehicle enters the boiler after the boiler is stopped to collect an image of the water-cooling wall, and the image is compared with the image collected last time to judge the defect of the boiler, including deformation of the water-cooling wall. The device based on image recognition has low success rate of recognition of micro deformation of the water-cooled wall, and can only monitor after the boiler is stopped.
In view of the above, the embodiments of the present application provide a method, a system, and a device for monitoring deformation of a boiler water wall based on strain measurement, which utilize the method of strain measurement to realize online monitoring of the deformation of the boiler water wall bulge, and determine the safety and reliability of the boiler water wall from the early stage of failure occurrence. The following is a specific content of an embodiment of the present application.
Example 1
Referring to fig. 1, embodiment 1 of the present application provides a method for monitoring deformation of a boiler water wall based on strain measurement, comprising the following steps:
collecting strain measurement values of high-temperature strain gauges on the inner side and the outer side of the strip-shaped plate according to a preset time interval;
calculating the actual disturbance value of the appointed monitoring point by using the strain measurement values of the two high-temperature strain gauges of the appointed monitoring point;
the formula for calculating the disturbance degree value h of the appointed monitoring point is as follows:
wherein L is the distance between the pipelines; epsilon i The strain measurement value is the strain measurement value of the inner high-temperature strain gauge; epsilon o The strain measurement value is the strain measurement value of the outer high-temperature strain gauge; k is the neutral layer coefficient, K is defined by the bending inner diameter R i And inquiring the thickness delta of the plate to obtain; a is the strain measurement intermediate variable.
In this embodiment, strain measurement values of high-temperature strain gauges installed on the inner side and the outer side of a strip-shaped plate are collected once every 1 minute, a lead-out wire of the high-temperature strain gauge and a strain acquisition instrument are connected, the strain acquisition instrument sends the strain measurement values of the high-temperature strain gauge to an engineer station, the engineer station calculates a disturbance value h according to the strain measurement values of the high-temperature strain gauge through a formula, two high-temperature strain gauges of the same monitoring point calculate an average value to be used as an actual disturbance value of the point, and an alarm is given when the disturbance exceeds a certain limit value.
In practical calculation, the deflection h is known to obtain the bending inner diameter R i And the neutral layer coefficient K value are used for calculating the disturbance degree h, so that an iteration method is adopted for calculation, and the iteration flow is adoptedAs shown in fig. 1 below.
Specifically, the iterative analysis is performed on the actual disturbance value h of the designated monitoring point, and the iterative analysis steps include:
collecting strain measurement epsilon of outer high-temperature strain gauge i And an inboard high temperature strain gauge strain measurement ε o ；
Setting an initial value h of the disturbance degree 0 The method comprises the steps of carrying out a first treatment on the surface of the Calculating the curved inner diameter R using equation (3) i ；
By means of a curved inner diameter R i Inquiring the thickness delta of the plate to obtain a neutral layer coefficient K;
obtaining an iterative disturbance value h by using a formula (1) and a formula (2) 1 ；
Calculating an iterative disturbance value h 1 Initial value h of sum scrambling degree 0 Is a difference deltah;
judging whether the difference value delta h is smaller than the iteration end threshold delta 0 If the difference value delta h is smaller than the iteration end threshold delta 0 The iterative disturbance value h 1 As a disturbance value h specifying the monitoring point.
Therefore, after the water-cooled wall bulges, a mechanism that the water-cooled wall plane bends is adopted, the water-cooled wall plane is measured, and the bending degree of the water-cooled wall plane is detected; the traditional technology cannot realize on-line measurement of bulges due to the high temperature characteristic of the water-cooled wall, cannot know the severity of the bulges before the faults further evolve, and cannot extract and take method measures; the application can realize online measurement; the traditional technology is not accurate in obtaining the micro deformation of the water-cooled wall no matter the method of manual measurement or image identification, and the method for obtaining the high-temperature strain value has higher measurement precision, can amplify the micro deformation amount and is more beneficial to the identification of early deformation.
It should be noted that the method of the embodiments of the present disclosure may be performed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene, and is completed by mutually matching a plurality of devices. In the case of such a distributed scenario, one of the devices may perform only one or more steps of the methods of embodiments of the present disclosure, the devices interacting with each other to accomplish the methods.
It should be noted that the foregoing describes some embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Example 2
Referring to fig. 2, 3 and 4, embodiment 2 of the present application provides a strain measurement-based boiler water wall deformation monitoring system, which adopts the strain measurement-based boiler water wall deformation monitoring method of embodiment 1 or any possible implementation thereof, and comprises a water wall deformation measurement assembly, wherein the water wall deformation measurement assembly comprises a strip-shaped plate 2 connected to two water wall pipelines 1 and deformed along with water wall bulges; high-temperature strain gauges 3 are welded on the inner side and the outer side of the center of the strip-shaped plate 2;
the high-temperature strain gauge 3 is connected with a strain acquisition instrument 5 through a lead 4, and the strain acquisition instrument 5 is used for acquiring a measured value of the high-temperature strain gauge 3; the strain acquisition instrument 5 is connected with an engineer station 6, and the engineer station 6 is used for judging the bulging deformation degree of the boiler water wall by utilizing the measured value of the high-temperature strain gauge 3.
In this embodiment, a space exists between two water wall pipelines 1 connected with the strip plate 2, and 3 to 6 water wall pipelines 1 are spaced between two water wall pipelines 1; the direction of the strip-shaped plate 2 is horizontal, and the strip-shaped plate 2 is positioned at the position of 2.0m above the burner.
Referring to fig. 5, in this embodiment, the high-temperature strain gauge 3 is welded to the middle position of the strip-shaped plate 2 by spot welding, the number of welding spots in the long side direction of the high-temperature strain gauge 3 is greater than 20, and the number of welding spots in the short side direction of the high-temperature strain gauge 3 is greater than 10.
Specifically, a water-cooled wall deformation measuring assembly is arranged at the position of 2.0m above the outer wall burner of the water-cooled wall; the water wall deformation measuring assembly is characterized in that strip-shaped plates 2 which deform together with the water wall bulges are welded on two water wall pipelines 1 (3-6 intervals), and high-temperature strain gauges 3 which can bear more than 700 ℃ are welded on the inner side and the outer side of the central position of the strip-shaped plates 2. The deformation of the water-cooled wall can be measured by adopting the strain gauge 3 capable of bearing the high temperature of more than 700 ℃, so that the on-line measurement can be realized.
Wherein, the strip-shaped plate 2 adopts an austenitic steel plate, and two ends of the austenitic steel plate are respectively welded on the outer side surfaces of 3-6 water wall pipelines 1 at intervals. The high-temperature strain gauge 3 is welded to the middle position of the austenitic steel plate by a spot welding method, wherein 20 welding spots are more than 20 welding spots in the long side direction, and 10 welding spots are more than 10 welding spots in the short side direction.
Referring to fig. 6, in this embodiment, the measured values of the high temperature strain gauge 3 are:
1/2 of the difference between the measurement value of the high temperature strain gauge 3 inside the center position of the strip-shaped plate 2 and the measurement value of the high temperature strain gauge 3 outside the center position of the strip-shaped plate 2. Modeling the strip-shaped plate 2 by using finite element software, establishing a corresponding relation between a strain measurement value of the strip-shaped plate 2 and a water-cooled wall bulge disturbance value, and obtaining the water-cooled wall bulge disturbance value through the corresponding relation between the strain measurement value and the water-cooled wall bulge disturbance value; and monitoring the bulge disturbance value of the water-cooled wall, and performing bulge alarm when the bulge disturbance value of the water-cooled wall exceeds a preset limit value.
Specifically, the measured values of the high temperature strain gauge 3 are transmitted to the strain gauge 5 via the wire 4, and the strain gauge 5 data is further sent to the engineer station 6. After the deformation, 1/2 of the difference between the measured value of the inner high temperature strain gauge 3 and the measured value of the outer high temperature strain gauge 3 is used as the measured value of the deformation of the strip plate 2, and the degree of the bulge deformation of the boiler water wall is judged on the engineer station 6 by using the measured value. Further, finite element software is utilized to model the measurement strip plate 2, a corresponding relation between the strain measurement value and the bulge deformation value is established, the bulge disturbance degree, namely the bulge deformation amount, can be accurately calculated through the strain measurement value and the corresponding relation value, and an alarm is given when the bulge disturbance degree exceeds a certain limit value.
The analysis method of the finite element software integration comprises the following steps:
the formula for calculating the disturbance degree value h of the appointed monitoring point is as follows:
wherein L is the distance between the pipelines; epsilon i The strain measurement value is the inner high-temperature strain gauge 3; epsilon o The strain measurement value is the strain measurement value of the outer high-temperature strain gauge 3; k is the neutral layer coefficient, K is defined by the bending inner diameter R i And inquiring the thickness delta of the plate to obtain; a is the strain measurement intermediate variable.
In summary, in the embodiment of the application, the water-cooled wall deformation measuring assembly is arranged at the position 2.0m above the external wall burner of the water-cooled wall; the water wall deformation measuring assembly is characterized in that strip-shaped plates 2 which deform together with the water wall bulges are welded on two water wall pipelines 1 (3-6 intervals), and high-temperature strain gauges 3 which can bear more than 700 ℃ are welded on the inner side and the outer side of the central position of the strip-shaped plates 2. The deformation of the water-cooled wall can be measured by adopting the strain gauge 3 capable of bearing the high temperature of more than 700 ℃, so that the on-line measurement can be realized. The measured values of the high temperature strain gauge 3 are transmitted via the wire 4 to a strain gauge 5, and the strain gauge 5 data is further sent to an engineer station 6. After the deformation, 1/2 of the difference between the measured value of the inner high temperature strain gauge 3 and the measured value of the outer high temperature strain gauge 3 is used as the measured value of the deformation of the strip plate 2, and the degree of the bulge deformation of the boiler water wall is judged on the engineer station 6 by using the measured value. Further, finite element software is utilized to model the measurement strip plate 2, a corresponding relation between the strain measurement value and the bulge deformation value is established, the bulge disturbance degree, namely the bulge deformation amount, can be accurately calculated through the strain measurement value and the corresponding relation value, and an alarm is given when the bulge disturbance degree exceeds a certain limit value. The method for acquiring the high-temperature strain value has higher measurement precision, can amplify the micro deformation and is more beneficial to the identification of early deformation.
Example 3
Referring to fig. 3, embodiment 3 of the present application provides a strain measurement-based boiler water wall deformation monitoring device, including:
the measured value acquisition module 7 is used for acquiring strain measured values of the high-temperature strain gauges on the inner side and the outer side of the strip-shaped plate according to a preset time interval;
the disturbance degree value calculation module 8 is used for calculating the actual disturbance degree value of the appointed monitoring point by using the strain measurement values of the two high-temperature strain gauges of the appointed monitoring point;
the formula for calculating the disturbance degree value h of the appointed monitoring point is as follows:
wherein L is the distance between the pipelines; epsilon i The strain measurement value is the strain measurement value of the inner high-temperature strain gauge; epsilon o The strain measurement value is the strain measurement value of the outer high-temperature strain gauge; k is the neutral layer coefficient, K is defined by the bending inner diameter R i And inquiring the thickness delta of the plate to obtain; a is the strain measurement intermediate variable.
In this embodiment, the method further includes:
the iteration analysis module 9 is used for carrying out iteration analysis on the actual disturbance value h of the appointed monitoring point;
the iterative analysis module 3 utilizes the outside high temperature strain gauge strain measurement acquired by the measurement value acquisition module 7Value epsilon i And an inboard high temperature strain gauge strain measurement ε o ；
The iterative analysis module 9 comprises:
a curved inner diameter calculation sub-module 91 for setting a disturbance degree initial value h 0 The method comprises the steps of carrying out a first treatment on the surface of the Calculating the curved inner diameter R using equation (3) i ；
Neutral layer coefficient query submodule 92 for utilizing a curved inner diameter R i Inquiring the thickness delta of the plate to obtain a neutral layer coefficient K;
an iterative disturbance value calculation sub-module 93 for obtaining an iterative disturbance value h by using the formula (1) and the formula (2) 1 ；
An iteration accuracy analysis sub-module 94 for calculating an iteration disturbance value h 1 Initial value h of sum scrambling degree 0 Is a difference deltah;
an iteration end submodule 95 for judging whether the difference Δh is smaller than the iteration end threshold Δh 0 If the difference value delta h is smaller than the iteration end threshold delta 0 The iterative disturbance value h 1 As a disturbance value h specifying the monitoring point.
It should be noted that, because the content of information interaction and execution process between the modules of the above-mentioned device is based on the same concept as the method embodiment in the embodiment 1 of the present application, the technical effects brought by the content are the same as the method embodiment of the present application, and the specific content can be referred to the description in the foregoing illustrated method embodiment of the present application, which is not repeated herein.
Example 4
Embodiment 4 of the present application provides a non-transitory computer readable storage medium having stored therein program code for a strain measurement-based boiler water wall deformation monitoring method, the program code comprising instructions for performing the strain measurement-based boiler water wall deformation monitoring method of embodiment 1 or any possible implementation thereof.
Computer readable storage media can be any available media that can be accessed by a computer or data storage devices, such as servers, data centers, etc., that contain an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk, SSD), etc.
Example 5
Embodiment 5 of the present application provides an electronic device, including: a memory and a processor;
the processor and the memory complete communication with each other through a bus; the memory stores program instructions executable by the processor to invoke the program instructions capable of performing the strain measurement based boiler water wall deformation monitoring method of embodiment 1 or any possible implementation thereof.
Specifically, the processor may be implemented by hardware or software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor, implemented by reading software code stored in a memory, which may be integrated in the processor, or may reside outside the processor, and which may reside separately.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.).
It will be appreciated by those skilled in the art that the modules or steps of the application described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may alternatively be implemented in program code executable by computing devices, so that they may be stored in a memory device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.
While the application has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the application and are intended to be within the scope of the application as claimed.
Claims (10)
1. The method for monitoring the deformation of the water-cooled wall of the boiler based on the strain measurement is characterized by comprising the following steps of:
collecting strain measurement values of high-temperature strain gauges on the inner side and the outer side of the strip-shaped plate according to a preset time interval;
calculating the actual disturbance value of the appointed monitoring point by using the strain measurement values of the two high-temperature strain gauges of the appointed monitoring point;
the formula for calculating the disturbance degree value h of the appointed monitoring point is as follows:
wherein L is the distance between the pipelines; epsilon i The strain measurement value is the strain measurement value of the inner high-temperature strain gauge; epsilon o The strain measurement value is the strain measurement value of the outer high-temperature strain gauge; k is the neutral layer coefficient, K is defined by the bending inner diameter R i And inquiring the thickness delta of the plate to obtain; a is the strain measurement intermediate variable.
2. The strain measurement-based boiler water wall deformation monitoring method according to claim 1, wherein the step of performing iterative analysis on the actual disturbance value h of the designated monitoring point comprises:
collecting strain measurement epsilon of inner high-temperature strain gauge i And outboard high temperature strain gauge strain measurement ε o ；
Setting an initial value h of the disturbance degree 0 The method comprises the steps of carrying out a first treatment on the surface of the Calculating the curved inner diameter R using equation (3) i ；
By means of a curved inner diameter R i Inquiring the thickness delta of the plate to obtain a neutral layer coefficient K;
obtaining an iterative disturbance value h by using a formula (1) and a formula (2) 1 ；
Calculating an iterative disturbance value h 1 Initial value h of sum scrambling degree 0 Is a difference deltah;
judging whether the difference value delta h is smaller than the iteration end threshold delta 0 If the difference value delta h is smaller than the iteration end threshold delta 0 The iterative disturbance value h 1 As a disturbance value h specifying the monitoring point.
3. A strain measurement-based boiler water wall deformation monitoring system, which adopts the strain measurement-based boiler water wall deformation monitoring method according to any one of claims 1 to 2, and is characterized by comprising a water wall deformation measurement assembly, wherein the water wall deformation measurement assembly comprises strip-shaped plates connected to two water wall pipelines and deformed along with water wall bulges; high-temperature strain gauges are welded on the inner side and the outer side of the center of the strip-shaped plate;
the high-temperature strain gauge is connected with a strain acquisition instrument through a wire, and the strain acquisition instrument is used for acquiring a measured value of the high-temperature strain gauge; the strain acquisition instrument is connected with an engineer station, and the engineer station is used for judging the bulging deformation degree of the boiler water wall by utilizing the measured value of the high-temperature strain gauge.
4. The strain measurement based boiler water wall deformation monitoring system of claim 3 wherein there is a space between two water wall pipes connected by the strip plate, and 3 to 6 water wall pipes are spaced between two water wall pipes;
the direction of the strip-shaped plate is the horizontal direction, and the strip-shaped plate is positioned at the position of 2.0m above the burner.
5. The strain measurement-based boiler water wall deformation monitoring system according to claim 4, wherein the high-temperature strain gauge is welded at the middle position of the strip-shaped plate by a spot welding method, the number of welding spots in the long side direction of the high-temperature strain gauge is more than 20, and the number of welding spots in the short side direction of the high-temperature strain gauge is more than 10.
6. The strain measurement-based boiler water wall deformation monitoring system of claim 5 wherein the high temperature strain gauge measurement is:
and 1/2 of the difference between the high temperature strain gauge measurement value inside the central position of the strip-shaped plate and the high temperature strain gauge measurement value outside the central position of the strip-shaped plate.
7. The strain measurement-based boiler water wall deformation monitoring system of claim 6, wherein the strip is modeled using finite element software, a correspondence between strain measurement values of the strip and water wall bulge disturbance values is established, and the water wall bulge disturbance values are obtained from the correspondence between strain measurement values and water wall bulge disturbance values.
8. The strain measurement-based boiler water wall deformation monitoring system of claim 7, wherein the water wall bulge disturbance value is monitored, and bulge warning is performed when the water wall bulge disturbance value exceeds a preset limit value.
9. Boiler water wall deformation monitoring device based on strain measurement, its characterized in that includes:
the measured value acquisition module is used for acquiring strain measured values of the high-temperature strain gauges on the inner side and the outer side of the strip-shaped plate according to a preset time interval;
the disturbance degree value calculation module is used for calculating the actual disturbance degree value of the appointed monitoring point by utilizing the strain measurement values of the two high-temperature strain gauges of the appointed monitoring point;
the formula for calculating the disturbance degree value h of the appointed monitoring point is as follows:
wherein L is the distance between the pipelines; epsilon i The strain measurement value is the strain measurement value of the inner high-temperature strain gauge; epsilon o The strain measurement value is the strain measurement value of the outer high-temperature strain gauge; k is the neutral layer coefficient, K is defined by the bending inner diameter R i And inquiring the thickness delta of the plate to obtain; a is the strain measurement intermediate variable.
10. The strain measurement-based boiler water wall deformation monitoring device of claim 9, further comprising:
the iteration analysis module is used for carrying out iteration analysis on the actual disturbance value h of the appointed monitoring point;
the iteration analysis module utilizes the inner side high temperature strain gauge strain measurement epsilon acquired by the measurement acquisition module i And outboard high temperature strain gauge strain measurement ε o ；
The iterative analysis module comprises:
a bending inner diameter calculation sub-module for setting a disturbance degree initial value h 0 The method comprises the steps of carrying out a first treatment on the surface of the Calculating the curved inner diameter R using equation (3) i ；
Neutral layer coefficient query submodule for utilizing curved inner diameter R i Inquiring the thickness delta of the plate to obtain a neutral layer coefficient K;
an iterative disturbance value calculation sub-module for obtaining an iterative disturbance value h by using the formula (1) and the formula (2) 1 ；
An iteration precision analysis sub-module for calculating an iteration disturbance value h 1 Initial value h of sum scrambling degree 0 Is a difference deltah;
an iteration end submodule for judging whether the difference value delta h is smaller than an iteration end threshold delta 0 If the difference value delta h is smaller than the iteration end threshold delta 0 The iterative disturbance value h 1 As a disturbance value h specifying the monitoring point.
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| CN202311173606.0A CN117029759A (en) | 2023-09-12 | 2023-09-12 | Boiler water-cooled wall deformation monitoring method, system and device based on strain measurement |
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| CN202311173606.0A CN117029759A (en) | 2023-09-12 | 2023-09-12 | Boiler water-cooled wall deformation monitoring method, system and device based on strain measurement |
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