CN110672232A - Method and device for correcting tube wall temperature of boiler heating surface and storage medium - Google Patents
Method and device for correcting tube wall temperature of boiler heating surface and storage medium Download PDFInfo
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Abstract
The invention discloses a method for correcting the wall temperature of a boiler heating surface pipe. The method comprises the following steps: obtaining the thickness of the oxide scale of the heated surface pipe and the corresponding boiler operation time; calculating a metal equivalent temperature value by using a preset mathematical model according to the thickness and the operation time of the scale; obtaining a temperature value of a temperature measuring point on the outer wall of the boiler; and correcting the temperature value of the furnace outer wall temperature measuring point according to the metal equivalent temperature value to obtain a heated surface pipe wall temperature corrected value. The invention also discloses a device for correcting the wall temperature of the heated surface pipe of the boiler and a computer readable storage medium. The invention can realize the purpose of providing a method for more accurately correcting the temperature value of the tube wall of the heating surface monitored by the temperature measuring point on the outer wall of the boiler.
Description
Technical Field
The invention relates to the technical field of safety monitoring of power station equipment, in particular to a method and a device for correcting the wall temperature of a boiler heating surface pipe and a computer readable storage medium.
Background
The high-temperature creep rupture is a main failure mode of a heating surface pipe of a power station boiler, and pipe explosion accidents caused by the creep rupture account for more than half of unplanned shutdown accidents of the boiler. The wall temperature value of the heating surface pipe in the power station equipment boiler is the first factor influencing the creep life of the heating surface pipe. Therefore, the real metal wall temperature of the heated surface pipe is accurately obtained, and the method plays an important role in mastering the health condition of equipment and reducing the heated surface pipe leakage caused by overtemperature.
At present, due to the influence of factors such as a flue gas environment, a heat transfer characteristic, a radiation area and the like, the fact that temperature measuring points are directly installed in a furnace is not practical, the temperature measuring points are easily influenced by a high-temperature environment, and the temperature measuring points are damaged after a long time, so that monitoring data are mistaken. Therefore, in the prior art, for monitoring the actual wall temperature of the heated surface tube in the furnace, the temperature value of the heated surface tube is determined mainly by installing a wall temperature measuring point outside the furnace and judging and adjusting the temperature value monitored by the wall temperature measuring point according to the industry experience of an operator. The method for adjusting the wall temperature of the heated surface pipe by depending on the experience of the operator is often inaccurate, and the deviation between the method and the actual wall temperature value of the heated surface pipe is easy to exist, so that the real metal wall temperature of the heated surface pipe in the furnace can not be accurately reflected.
Disclosure of Invention
The invention mainly aims to provide a method and a device for correcting the wall temperature of a heated surface tube of a boiler and a computer readable storage medium, and aims to provide a method for correcting the wall temperature value of the heated surface tube monitored by a temperature measuring point on the outer wall of the boiler more accurately.
In order to achieve the above object, the present invention provides a method for correcting a tube wall temperature of a heated surface of a boiler, comprising the steps of:
obtaining the thickness of the oxide scale of the heated surface pipe and the corresponding boiler operation time;
calculating a metal equivalent temperature value by using a preset mathematical model according to the thickness and the operation time of the scale;
obtaining a temperature value of a temperature measuring point on the outer wall of the boiler;
and correcting the temperature value of the furnace outer wall temperature measuring point according to the metal equivalent temperature value to obtain a heated surface pipe wall temperature corrected value.
Optionally, the step of obtaining the thickness of the oxide scale of the heated surface tube includes:
obtaining the position of a temperature measuring point on the outer wall of the furnace;
determining the position of the measuring point of the oxide skin thickness of the heated surface pipe according to the position of the measuring point of the temperature of the outer wall of the furnace and preset boiler parameters;
and carrying out ultrasonic thickness measurement on the measuring point position to obtain the thickness of the oxide scale of the heated surface pipe.
Optionally, the step of performing ultrasonic thickness measurement on the measuring point position to obtain the thickness of the scale skin of the heated surface tube further includes:
receiving parameters obtained by a user through pipe cutting inspection on the heated surface pipe and an oxide skin thickness correction value of the heated surface pipe input after calculation of a metallographic method;
and carrying out ultrasonic thickness measurement on the heated surface pipe according to the oxide scale thickness correction value to obtain the oxide scale thickness of the heated surface pipe.
Optionally, the preset mathematical model is:
where T is the run time (in h), x is the scale thickness (in mm), T is the equivalent temperature (in C.), and a and b are the material constants.
Optionally, the step of correcting the temperature value of the furnace outer wall temperature measuring point according to the metal equivalent temperature value to obtain a corrected value of the heated surface tube wall temperature includes:
obtaining an average temperature value within preset time of a temperature measuring point on the outer wall of the furnace;
calculating to obtain a wall temperature measuring point correction difference value by using a preset first formula according to the metal equivalent temperature value and the average temperature value obtained within the preset time;
and correcting the temperature value of the furnace outer wall temperature measuring point according to the wall temperature measuring point correction difference value to obtain a heated surface pipe wall temperature correction value.
Optionally, the preset first formula is:
ΔT＝T1-T2
wherein △ T is the wall temperature measuring point correction difference, T1 is the metal equivalent temperature value, and T2 is the average temperature value obtained within the preset time.
Optionally, the step of correcting the temperature value of the furnace outer wall temperature measuring point according to the wall temperature measuring point correction difference value to obtain a heated surface pipe wall temperature correction value includes:
and calculating according to the wall temperature measuring point correction difference value and the temperature value of the furnace outer wall temperature measuring point by using a preset second formula to obtain a heated surface pipe wall temperature correction value.
Optionally, the preset second formula is:
T3’＝T3+ΔT
wherein T3' is the corrected value of the wall temperature of the heated surface tube, T3 is the temperature value of the temperature measuring point of the outer wall of the furnace, and △ T is the corrected difference value of the temperature measuring point of the wall.
In addition, in order to achieve the above object, the present invention provides a boiler heating surface tube wall temperature correcting device, including: the system comprises a memory, a processor and a boiler heating surface tube wall temperature correcting program which is stored on the memory and can run on the processor, wherein when the processor executes the boiler heating surface tube wall temperature correcting program, the steps of the boiler heating surface tube wall temperature correcting method are realized.
In addition, in order to achieve the above object, the present invention further provides a computer-readable storage medium, in which a boiler heating surface tube wall temperature correction program is stored, and the computer-readable storage medium, when being executed by a processor, realizes the steps of the boiler heating surface tube wall temperature correction method.
The invention provides a method and a device for correcting the wall temperature of a boiler heating surface pipe and a computer storage medium. In the method, the thickness of the oxide scale of a heated surface pipe and the corresponding boiler running time are obtained; calculating a metal equivalent temperature value by using a preset mathematical model according to the thickness and the operation time of the scale; obtaining a temperature value of a temperature measuring point on the outer wall of the boiler; and correcting the temperature value of the furnace outer wall temperature measuring point according to the metal equivalent temperature value to obtain a heated surface pipe wall temperature corrected value. Through the mode, the method can calculate the metal equivalent temperature value according to the oxide scale thickness of the heated surface pipe, and correct the temperature value monitored by the furnace outer wall temperature measuring point according to the metal equivalent temperature value, so that the corrected temperature value is closer to the actual temperature value of the heated surface pipe, and the temperature value can be used as a key parameter for online monitoring of the wall temperature of the heated surface pipe of the boiler and calculation of service life loss, so that operating personnel can master the health condition of equipment in time through the corrected temperature value, and leakage of the heated surface pipe caused by overtemperature is reduced. Meanwhile, the method utilizes the existing furnace outer wall temperature measuring point of the power plant, does not need to add a new measuring point, does not need to transform the cost, and is a more convenient and practical method for obtaining the temperature value of the heating surface pipe with higher accuracy.
Drawings
FIG. 1 is a schematic diagram of an apparatus in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a first embodiment of a method for correcting the wall temperature of a heated surface of a boiler according to the present invention;
FIG. 3 is a schematic flow chart illustrating a second embodiment of a method for correcting the wall temperature of a boiler heating surface tube according to the present invention;
FIG. 4 is a schematic flow chart illustrating a method for correcting the wall temperature of a heating surface tube of a boiler according to a third embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a fourth embodiment of a method for correcting the wall temperature of a boiler heating surface tube according to the present invention;
FIG. 6 is a schematic flow chart illustrating a fifth embodiment of a method for correcting a wall temperature of a heating surface tube of a boiler according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic device structure diagram of a hardware operating environment according to an embodiment of the present invention.
The terminal of the embodiment of the invention can be a PC, and can also be a terminal device with a data processing function, such as a smart phone, a tablet computer, a portable computer and the like.
As shown in fig. 1, the terminal may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the terminal may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a Wi-Fi module, and the like. Such as light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display screen according to the brightness of ambient light, and a proximity sensor that may turn off the display screen and/or the backlight when the mobile terminal is moved to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), detect the magnitude and direction of gravity when the mobile terminal is stationary, and can be used for applications (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer and tapping) and the like for recognizing the attitude of the mobile terminal; of course, the mobile terminal may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which are not described herein again.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, the memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a boiler heating surface tube wall temperature correcting program.
In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call the boiler heating surface tube wall temperature correction program stored in the memory 1005, and perform the following operations:
obtaining the thickness of the oxide scale of the heated surface pipe and the corresponding boiler operation time;
calculating a metal equivalent temperature value by using a preset mathematical model according to the thickness and the operation time of the scale;
obtaining a temperature value of a temperature measuring point on the outer wall of the boiler;
and correcting the temperature value of the furnace outer wall temperature measuring point according to the metal equivalent temperature value to obtain a heated surface pipe wall temperature corrected value.
Further, the processor 1001 may call the boiler heating surface tube wall temperature correction program stored in the memory 1005, and further perform the following operations:
the step of obtaining the thickness of the oxide scale of the heated surface tube comprises the following steps:
obtaining the position of a temperature measuring point on the outer wall of the furnace;
determining the position of the measuring point of the oxide skin thickness of the heated surface pipe according to the position of the measuring point of the temperature of the outer wall of the furnace and preset boiler parameters;
and carrying out ultrasonic thickness measurement on the measuring point position to obtain the thickness of the oxide scale of the heated surface pipe.
Further, the processor 1001 may call the boiler heating surface tube wall temperature correction program stored in the memory 1005, and further perform the following operations:
the step of performing ultrasonic thickness measurement on the measuring point position to obtain the thickness of the oxide skin of the heated surface pipe further comprises the following steps:
receiving parameters obtained by a user through pipe cutting inspection on the heated surface pipe and an oxide skin thickness correction value of the heated surface pipe input after calculation of a metallographic method;
and carrying out ultrasonic thickness measurement on the heated surface pipe according to the oxide scale thickness correction value to obtain the oxide scale thickness of the heated surface pipe.
Further, the processor 1001 may call the boiler heating surface tube wall temperature correction program stored in the memory 1005, and further perform the following operations:
the preset mathematical model is as follows:
where T is the run time (in h), x is the scale thickness (in mm), T is the equivalent temperature (in C.), and a and b are the material constants.
Further, the processor 1001 may call the boiler heating surface tube wall temperature correction program stored in the memory 1005, and further perform the following operations:
the step of correcting the temperature value of the furnace outer wall temperature measuring point according to the metal equivalent temperature value to obtain a heated surface pipe wall temperature correction value comprises the following steps:
obtaining an average temperature value within preset time of a temperature measuring point on the outer wall of the furnace;
calculating to obtain a wall temperature measuring point correction difference value by using a preset first formula according to the metal equivalent temperature value and the average temperature value obtained within the preset time;
and correcting the temperature value of the furnace outer wall temperature measuring point according to the wall temperature measuring point correction difference value to obtain a heated surface pipe wall temperature correction value.
Further, the processor 1001 may call the boiler heating surface tube wall temperature correction program stored in the memory 1005, and further perform the following operations:
the preset first formula is as follows:
ΔT＝T1-T2
wherein △ T is the wall temperature measuring point correction difference, T1 is the metal equivalent temperature value, and T2 is the average temperature value obtained within the preset time.
Further, the processor 1001 may call the boiler heating surface tube wall temperature correction program stored in the memory 1005, and further perform the following operations:
the step of correcting the temperature value of the furnace outer wall temperature measuring point according to the wall temperature measuring point correction difference value to obtain a heated surface pipe wall temperature correction value comprises the following steps:
and calculating according to the wall temperature measuring point correction difference value and the temperature value of the furnace outer wall temperature measuring point by using a preset second formula to obtain a heated surface pipe wall temperature correction value.
Further, the processor 1001 may call the boiler heating surface tube wall temperature correction program stored in the memory 1005, and further perform the following operations:
the preset second formula is as follows:
T3’＝T3+ΔT
wherein T3' is the corrected value of the wall temperature of the heated surface tube, T3 is the temperature value of the temperature measuring point of the outer wall of the furnace, and △ T is the corrected difference value of the temperature measuring point of the wall.
The specific embodiment of the boiler heating surface tube wall temperature correction device of the present invention is substantially the same as the following embodiments of the boiler heating surface tube wall temperature correction method, and will not be described herein again.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of a method for correcting a wall temperature of a heated surface tube of a boiler according to the present invention, where the method for correcting a wall temperature of a heated surface tube of a boiler includes:
s100, obtaining the thickness of the oxide scale of the heated surface pipe and the corresponding boiler operation time;
in the embodiment of the invention, the heating surface pipe is positioned inside the power plant boiler and consists of a plurality of heating pipes. The oxide scale thickness of the heated surface tube and the corresponding boiler running time are obtained first. The oxide scale thickness of the heated surface tube corresponds to the boiler operation time, and the longer the boiler operation time is, the thicker the oxide scale thickness of the heated surface tube is, so that the operation time of the boiler corresponding to the thickness is recorded while the oxide scale thickness of the heated surface tube is obtained. Specifically, the thickness of the oxide skin of the heated surface pipe can be obtained by performing off-line inspection through ultrasonic thickness measurement, or can be obtained by manual measurement such as pipe cutting.
Step S200, calculating a metal equivalent temperature value by using a preset mathematical model according to the thickness and the operation time of the oxide scale;
after the oxide skin thickness and the operation time of the boiler are obtained, the metal equivalent temperature value can be calculated by utilizing a preset mathematical model according to the oxide skin thickness and the operation time.
The mathematical model refers to that the growth dynamics rule of the oxide layer on the inner wall of the boiler tube has a certain functional relation with the operation time and the temperature, the functional relation can be obtained through test data fitting, and the mathematical model is established on the basis of the functional relation.
The metal equivalent temperature means that the metal wall temperature at a particular time is not significant for calculating creep life loss. Since the metal wall temperature at a particular time is constantly changing over time. Regardless of the temperature and the stress condition, the life loss of a certain section of pipe can be equivalent to the same time of being used under a certain fixed metal temperature and a specific stress condition, and the equivalent metal temperature is called as the metal equivalent temperature.
The preset mathematical model is as follows:
where T is the run time (in h), x is the scale thickness (in mm), T is the equivalent temperature (in C.), and a and b are the material constants.
In the preset mathematical model, a and b are material constants obtained by fitting experimental data.
Step S300, obtaining a temperature value of a temperature measuring point on the outer wall of the boiler;
and obtaining a temperature value of a temperature measuring point on the outer wall of the boiler, wherein the temperature value is obtained by monitoring the temperature measuring point on the outer side of the boiler. The temperature value obtained by monitoring the wall temperature measuring point outside the boiler is deviated from the actual temperature value of the heated surface pipe. Generally, the temperature deviation is about 5 to 10 ℃, and the heat transfer characteristic is deteriorated due to the oxidation of the tube in the later period, and the deviation can reach about 30 ℃.
And S400, correcting the temperature value of the furnace outer wall temperature measuring point according to the metal equivalent temperature value to obtain a heated surface pipe wall temperature correction value.
After the metal equivalent temperature value is obtained through the steps, the temperature value of the furnace outer wall temperature measuring point is corrected according to the metal equivalent temperature value, and a heated surface pipe wall temperature correction value is obtained. The corrected value of the wall temperature of the heated surface tube is closer to the actual temperature value of the heated surface tube, and the actual temperature of the heated surface tube can be more accurately reflected than the temperature value obtained by monitoring of the furnace outer wall temperature measuring point.
The invention provides a method and a device for correcting the wall temperature of a boiler heating surface pipe and a computer storage medium. In the method, the thickness of the oxide scale of a heated surface pipe and the corresponding boiler running time are obtained; calculating a metal equivalent temperature value by using a preset mathematical model according to the thickness and the operation time of the scale; obtaining a temperature value of a temperature measuring point on the outer wall of the boiler; and correcting the temperature value of the furnace outer wall temperature measuring point according to the metal equivalent temperature value to obtain a heated surface pipe wall temperature corrected value. Through the mode, the method can calculate the metal equivalent temperature value according to the oxide scale thickness of the heated surface pipe, and correct the temperature value monitored by the furnace outer wall temperature measuring point according to the metal equivalent temperature value, so that the corrected temperature value is closer to the actual temperature value of the heated surface pipe, and the temperature value can be used as a key parameter for online monitoring of the wall temperature of the heated surface pipe of the boiler and calculation of service life loss, so that operating personnel can master the health condition of equipment in time through the corrected temperature value, and leakage of the heated surface pipe caused by overtemperature is reduced. Meanwhile, the method utilizes the existing furnace outer wall temperature measuring point of the power plant, does not need to add a new measuring point, does not need to transform the cost, and is a more convenient and practical method for obtaining the temperature value of the heating surface pipe with higher accuracy.
Referring to fig. 3, fig. 3 is a schematic flow chart illustrating a second embodiment of a method for correcting a wall temperature of a heating surface of a boiler according to the present invention.
Based on the foregoing embodiment, in this embodiment, step S100 includes:
step S110, obtaining the position of a furnace outer wall temperature measuring point;
in this embodiment, the positions of the furnace outer wall temperature measurement points are obtained first, and specifically, a list of the boiler heating surface wall temperature measurement points can be constructed, including measurement point numbers, measurement point positions, measurement point characteristic descriptions, and the like.
Step S120, determining the measuring point position of the oxide skin thickness of the heated surface pipe according to the position of the furnace outer wall temperature measuring point and preset boiler parameters;
and after the position of the furnace outer wall temperature measuring point is obtained, determining the measuring point position of the oxide skin thickness of the heated surface pipe according to the position of the furnace outer wall temperature measuring point and preset boiler parameters. Specifically, the measuring point position of the oxide skin thickness test of the heating surface tube can be selected according to the position of the outer wall temperature measuring point of the furnace, the design parameters of the boiler and the temperature field distribution of the furnace chamber.
And S130, performing ultrasonic thickness measurement on the measuring point position to obtain the thickness of the oxidized scale of the heated surface pipe.
After a proper measuring point position of the heated surface pipe for measuring the oxide skin thickness is selected, ultrasonic thickness measurement is carried out on the measuring point position, namely, an ultrasonic thickness measuring tool is controlled to measure the measuring point position of the heated surface pipe, and the oxide skin thickness of the heated surface pipe is obtained.
Referring to fig. 4, fig. 4 is a schematic flow chart illustrating a method for correcting a wall temperature of a heated surface tube of a boiler according to a third embodiment of the present invention.
Based on the foregoing embodiment, in this embodiment, step S130 further includes:
step S140, receiving parameters obtained by a user through pipe cutting inspection on the heated surface pipe and an oxide skin thickness correction value of the heated surface pipe input after calculation of a metallographic method;
in the present embodiment, after the scale thickness of the heat-receiving surface pipe is obtained, the scale thickness of the heat-receiving surface pipe may be further corrected. Specifically, the oxide skin thickness correction value of the heated surface tube, which is input by a user after performing tube cutting inspection and metallographic calculation on the heated surface tube, can be received. The calculation of the corrected oxide skin thickness value according to the metallographic method is prior art and is not described in detail in the present application.
And S150, performing ultrasonic thickness measurement on the heated surface pipe according to the oxide scale thickness correction value to obtain the oxide scale thickness of the heated surface pipe.
And after obtaining the corrected scale thickness value, correcting the scale thickness of the heated surface pipe according to the corrected scale thickness value to obtain the corrected scale thickness of the heated surface pipe. The corrected oxide skin thickness of the heated surface pipe is more accurate, and the actual condition of the heated surface pipe can be reflected.
Referring to fig. 5, fig. 5 is a schematic flow chart illustrating a fourth embodiment of a method for correcting a wall temperature of a heating surface of a boiler according to the present invention.
Based on the foregoing embodiment, in this embodiment, step S400 includes:
s410, obtaining an average temperature value obtained within preset time of a temperature measuring point on the outer wall of the furnace;
in this embodiment, the average temperature value obtained within the preset time of the furnace outer wall temperature measurement point is obtained first. The preset time is a set time, and is preferably not less than 30 days, generally, according to experience. Specifically, the average temperature value may be obtained by deriving historical data of wall temperature measurement points within a preset time from a power plant DCS or SIS system, and performing averaging calculation according to the historical data. The average temperature value can reflect the long-term average temperature of the boiler working under the stable working condition.
Step S420, calculating by using a preset first formula according to the metal equivalent temperature value and the average temperature value obtained within the preset time to obtain a wall temperature measuring point correction difference value;
and obtaining a wall temperature measuring point correction difference value by utilizing a preset first formula according to the metal equivalent temperature value and the average temperature value obtained within the preset time.
The preset first formula is as follows:
ΔT＝T1-T2
wherein △ T is the wall temperature measuring point correction difference, T1 is the metal equivalent temperature value, and T2 is the average temperature value obtained within the preset time.
Through the formula, the wall temperature measuring point correction difference value can be calculated.
And step S430, correcting the temperature value of the furnace outer wall temperature measuring point according to the wall temperature measuring point correction difference value to obtain a heated surface pipe wall temperature correction value.
After the correction difference value of the wall temperature measuring point is obtained, the temperature value of the furnace outer wall temperature measuring point can be corrected according to the correction difference value of the wall temperature measuring point, and a heating surface pipe wall temperature correction value is obtained. The corrected value of the wall temperature of the heated surface tube is closer to the actual temperature value of the heated surface tube, and the actual temperature of the heated surface tube can be more accurately reflected than the temperature value obtained by monitoring of the furnace outer wall temperature measuring point.
Referring to fig. 6, fig. 6 is a schematic flow chart illustrating a fifth embodiment of a method for correcting a wall temperature of a heated surface of a boiler according to the present invention.
Based on the foregoing embodiment, in this embodiment, step S430 includes:
and step S431, calculating by using a preset second formula according to the wall temperature measuring point correction difference value and the temperature value of the furnace outer wall temperature measuring point to obtain a heated surface pipe wall temperature correction value.
In this embodiment, after obtaining the correction difference of the wall temperature measurement point, a preset second formula may be used to calculate according to the correction difference of the wall temperature measurement point and the temperature value of the furnace outer wall temperature measurement point, so as to obtain a corrected value of the heated surface tube wall temperature.
The preset second formula is:
T3’＝T3+ΔT
wherein T3' is the corrected value of the wall temperature of the heated surface tube, T3 is the temperature value of the temperature measuring point of the outer wall of the furnace, and △ T is the corrected difference value of the temperature measuring point of the wall.
Through the formula, the wall temperature corrected value of the heated surface pipe can be calculated and obtained according to the wall temperature measuring point corrected difference value and the temperature value of the furnace outer wall temperature measuring point, the wall temperature corrected value of the heated surface pipe is closer to the actual temperature value of the heated surface pipe, and the actual temperature of the heated surface pipe can be more accurately reflected than the temperature value obtained by monitoring the furnace outer wall temperature measuring point.
In addition, the embodiment of the invention also provides a computer readable storage medium.
The computer-readable storage medium of the present invention stores a boiler heating surface tube wall temperature correction program, and the boiler heating surface tube wall temperature correction program, when executed by a processor, implements the steps of the boiler heating surface tube wall temperature correction method as described above.
The method implemented when the boiler heating surface tube wall temperature correction program running on the processor is executed may refer to each embodiment of the boiler heating surface tube wall temperature correction method of the present invention, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for correcting the wall temperature of a boiler heating surface tube is characterized by comprising the following steps of:
obtaining the thickness of the oxide scale of the heated surface pipe and the corresponding boiler operation time;
calculating a metal equivalent temperature value by using a preset mathematical model according to the thickness and the operation time of the scale;
obtaining a long-term average value of temperature values of temperature measuring points on the outer wall of the boiler;
and correcting the temperature value of the furnace outer wall temperature measuring point according to the metal equivalent temperature value to obtain a heated surface pipe wall temperature corrected value.
2. The method for correcting the temperature of a tube wall of a heating surface of a boiler according to claim 1, wherein the step of obtaining the thickness of the scale on the heating surface tube comprises:
obtaining the position of a temperature measuring point on the outer wall of the furnace;
determining the position of the measuring point of the oxide skin thickness of the heated surface pipe according to the position of the measuring point of the temperature of the outer wall of the furnace and preset boiler parameters;
and carrying out ultrasonic thickness measurement on the measuring point positions, and verifying by a metallographic method to obtain the thickness of the oxide scale of the heated surface tube.
3. The method for correcting the wall temperature of the heated surface pipe of the boiler according to claim 2, wherein the step of performing ultrasonic thickness measurement on the positions of the measuring points to obtain the thickness of the oxide skin of the heated surface pipe further comprises:
receiving parameters obtained by a user through pipe cutting inspection on the heated surface pipe and an oxide skin thickness correction value of the heated surface pipe input after calculation of a metallographic method;
and carrying out ultrasonic thickness measurement on the heated surface pipe according to the oxide scale thickness correction value to obtain the oxide scale thickness of the heated surface pipe.
4. The method for correcting the tube wall temperature of the heating surface of the boiler according to claim 1, wherein the preset mathematical model is as follows:
where T is the run time (in h), x is the scale thickness (in mm), T is the equivalent temperature (in C.), and a and b are the material constants.
5. The method for correcting the tube wall temperature of the heating surface of the boiler according to claim 1, wherein the step of correcting the temperature value of the outer wall temperature measurement point of the boiler according to the metal equivalent temperature value to obtain a corrected value of the tube wall temperature of the heating surface comprises:
obtaining an average temperature value within preset time of a temperature measuring point on the outer wall of the furnace;
calculating to obtain a wall temperature measuring point correction difference value by using a preset first formula according to the metal equivalent temperature value and the average temperature value obtained within the preset time;
and correcting the temperature value of the furnace outer wall temperature measuring point according to the wall temperature measuring point correction difference value to obtain a heated surface pipe wall temperature correction value.
6. The method for correcting the tube wall temperature of a heating surface of a boiler according to claim 5, wherein the preset first formula is:
ΔT＝T1-T2
wherein △ T is the wall temperature measuring point correction difference, T1 is the metal equivalent temperature value, and T2 is the average temperature value obtained within the preset time.
7. The method for correcting the tube wall temperature of the heating surface of the boiler according to claim 5, wherein the step of correcting the temperature value of the external furnace wall temperature measuring point according to the correction difference value of the wall temperature measuring point to obtain the corrected value of the tube wall temperature of the heating surface comprises:
and calculating according to the wall temperature measuring point correction difference value and the temperature value of the furnace outer wall temperature measuring point by using a preset second formula to obtain a heated surface pipe wall temperature correction value.
8. The method for correcting the tube wall temperature of a heating surface of a boiler according to claim 7, wherein the predetermined second formula is:
T3’＝T3+ΔT
wherein T3' is the corrected value of the wall temperature of the heated surface tube, T3 is the temperature value of the temperature measuring point of the outer wall of the furnace, and △ T is the corrected difference value of the temperature measuring point of the wall.
9. A boiler heating surface tube wall temperature correcting device is characterized by comprising: a memory, a processor and a boiler heating surface tube wall temperature modification program stored on the memory and operable on the processor, the boiler heating surface tube wall temperature modification program when executed by the processor implementing the steps of the boiler heating surface tube wall temperature modification method according to any one of claims 1 to 8.
10. A computer-readable storage medium, wherein a boiler heating surface tube wall temperature correction program is stored on the computer-readable storage medium, and when the boiler heating surface tube wall temperature correction program is executed by a processor, the steps of the boiler heating surface tube wall temperature correction method according to any one of claims 1 to 8 are implemented.
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