CN111120988A - Boiler heating surface pipe wall overtemperature early warning method based on hearth temperature field distribution - Google Patents
Boiler heating surface pipe wall overtemperature early warning method based on hearth temperature field distribution Download PDFInfo
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- CN111120988A CN111120988A CN201911264033.6A CN201911264033A CN111120988A CN 111120988 A CN111120988 A CN 111120988A CN 201911264033 A CN201911264033 A CN 201911264033A CN 111120988 A CN111120988 A CN 111120988A
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- temperature
- heating surface
- field distribution
- pipe wall
- boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/38—Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
Abstract
The invention relates to a boiler heating surface pipe wall overtemperature early warning method based on hearth temperature field distribution, which comprises the following steps: step 1, acquiring temperature values of any point in a two-dimensional temperature field distribution area of a hearth temperature measurement plane at the bottom of a screen superheater and at the lower part of a flame folding angle; step 2, performing data fitting by taking the unit load, the bottom smoke temperature of the screen in the furnace, the desuperheating water quantity and the steam temperature as input variables and taking the wall temperature as an output variable based on historical data to obtain a fitting curve; and 3, comparing the difference value of the actually measured wall temperature and the fitting curve with a preset alarm value, if the difference value is greater than the preset alarm value, judging that the pipe wall of the heating surface of the boiler is over-temperature, and sending an over-temperature alarm signal. The invention takes the unit load, the bottom smoke temperature of the furnace inner screen, the desuperheating water amount and the steam temperature as important parameters for the overtemperature early warning of the heating surface, performs data fitting on the wall temperature under different working conditions, and can provide overtemperature early warning information of the heating surface in real time by taking the difference value of the actually measured wall temperature and a fitting curve as a criterion.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a boiler heating surface pipe wall overtemperature early warning method based on hearth temperature field distribution.
Background
There are a large number of metal pipes and components in the boiler plant, which are exposed to high temperature and pressure for a long time, and the safety of which is a crucial issue. However, because of various types, different specifications and large quantity of high-temperature metal parts of the boiler, and the shortage of management means, online detection methods and data processing methods, the over-temperature and subsequent trends in the pipe wall of the heating surface of the boiler cannot be predicted at present, and the safety and service life problems of the high-temperature pipeline of the boiler are always great problems troubling power generation enterprises.
Disclosure of Invention
Aiming at the problem of overtemperature of the heating surface of the boiler, the invention takes the load of a unit, the smoke temperature at the bottom of a screen in the boiler, the amount of desuperheating water and the steam temperature as important parameters for overtemperature warning of the heating surface, performs data fitting on the wall temperature under different working conditions, and provides overtemperature warning information of the heating surface in real time by taking the difference between the actually measured wall temperature and a fitting curve as a criterion.
The invention provides a boiler heating surface pipe wall overtemperature early warning method based on hearth temperature field distribution, which comprises the following steps:
step 1, acquiring temperature values of any point in a two-dimensional temperature field distribution area of a hearth temperature measurement plane at the bottom of a screen superheater and at the lower part of a flame folding angle;
step 2, performing data fitting by taking the unit load, the bottom smoke temperature of the screen in the furnace, the desuperheating water quantity and the steam temperature as input variables and taking the wall temperature as an output variable based on historical data to obtain a fitting curve;
and 3, comparing the difference value of the actually measured wall temperature and the fitting curve with a preset alarm value, if the difference value is greater than the preset alarm value, judging that the pipe wall of the heating surface of the boiler is over-temperature, and sending an over-temperature alarm signal.
Further, the temperature of the bottom smoke of the screen in the furnace in the step 2 is represented by a three-dimensional vector (X, Y, T); wherein, T is the average temperature of the plane, X, Y is the central position of the temperature field, and the definition formula is:
in the formula, N, M represents the number of nodes in the x and y directions after the two-dimensional temperature field distribution is subjected to gridding division, and T (x, y) represents the temperature value at (x, y).
Further, the preset alarm value in the step 3 is set according to different unit capacities and different furnace types.
By means of the scheme, the boiler heating surface pipe wall overtemperature early warning method based on hearth temperature field distribution is adopted, unit load, furnace screen bottom smoke temperature, desuperheating water amount and steam temperature are used as important parameters of heating surface overtemperature early warning, wall temperature is subjected to data fitting under different working conditions, the difference value of the actually measured wall temperature and a fitting curve is used as a criterion, and heating surface overtemperature early warning information can be provided in real time.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a flow chart of an over-temperature early warning method for a tube wall of a heating surface of a boiler based on hearth temperature field distribution according to the invention;
FIG. 2 is a schematic view of the position of the measuring plane of the temperature field of the furnace chamber according to the present invention;
FIG. 3 is a schematic of data fitting according to the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1 to 3, the embodiment provides a boiler heating surface tube wall overtemperature early warning method based on hearth temperature field distribution, including:
step S1, obtaining the temperature value of any point in the two-dimensional temperature field distribution area of the bottom of the screen superheater and the temperature measuring plane of the hearth below the folded flame angle; the schematic position of the measuring plane of the furnace temperature field is shown in figure 2.
Step S2, performing data fitting by taking the unit load, the bottom smoke temperature of the screen in the furnace, the desuperheating water amount and the steam temperature as input variables and taking the wall temperature as an output variable based on historical data to obtain a fitting curve; a schematic of the data fit is shown in figure 3.
Step S3, using the difference (Delta T) between the measured wall temperature and the fitting curve as the criterion and presetting the alarm value (T)alarm) Comparing, if the difference value (Delta T) is greater than a preset alarm value (T)alarm) And judging the overtemperature of the pipe wall of the heating surface of the boiler and sending an overtemperature alarm signal.
According to the boiler heating surface pipe wall overtemperature early warning method based on hearth temperature field distribution, unit load, furnace screen bottom smoke temperature, desuperheating water volume and steam temperature are used as important parameters of heating surface overtemperature early warning, wall temperature is subjected to data fitting under different working conditions, and the difference value of the actually measured wall temperature and a fitting curve is used as a criterion, so that heating surface overtemperature early warning information can be provided in real time.
In the present embodiment, the furnace bottom screen smoke temperature in step S2 is represented by a three-dimensional vector (X, Y, T); wherein, T is the average temperature of the plane, X, Y is the central position of the temperature field, and the definition formula is:
in the formula, N, M represents the number of nodes in the x and y directions after the two-dimensional temperature field distribution is subjected to gridding division, and T (x, y) represents the temperature value at (x, y).
In this embodiment, the alarm value (T) is preset in step 3alarm) Can be set according to different unit capacities and different furnace types.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A boiler heating surface pipe wall overtemperature early warning method based on hearth temperature field distribution is characterized by comprising the following steps:
step 1, acquiring temperature values of any point in a two-dimensional temperature field distribution area of a hearth temperature measurement plane at the bottom of a screen superheater and at the lower part of a flame folding angle;
step 2, performing data fitting by taking the unit load, the bottom smoke temperature of the screen in the furnace, the desuperheating water quantity and the steam temperature as input variables and taking the wall temperature as an output variable based on historical data to obtain a fitting curve;
and 3, comparing the difference value of the actually measured wall temperature and the fitting curve with a preset alarm value, if the difference value is greater than the preset alarm value, judging that the pipe wall of the heating surface of the boiler is over-temperature, and sending an over-temperature alarm signal.
2. The boiler heating surface pipe wall overtemperature warning method based on the hearth temperature field distribution of claim 1, wherein in the step 2, the temperature of the bottom smoke of the inner screen of the boiler is represented by a three-dimensional vector (X, Y, T); wherein, T is the average temperature of the plane, X, Y is the central position of the temperature field, and the definition formula is:
in the formula, N, M represents the number of nodes in the x and y directions after the two-dimensional temperature field distribution is subjected to gridding division, and T (x, y) represents the temperature value at (x, y).
3. The boiler heating surface pipe wall overtemperature warning method based on the hearth temperature field distribution of claim 1, wherein the preset alarm value in the step 3 is set according to different unit capacities and different furnace types.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113757637A (en) * | 2021-07-29 | 2021-12-07 | 华能(浙江)能源开发有限公司玉环分公司 | Early warning method for wall temperature of boiler superheater |
| CN114110550A (en) * | 2021-11-12 | 2022-03-01 | 国电内蒙古东胜热电有限公司 | Boiler temperature prediction method and system |
| CN114484409A (en) * | 2022-02-22 | 2022-05-13 | 北京博数智源人工智能科技有限公司 | Early warning method and device for furnace tube leakage accident of thermal power plant |
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| CN114484409A (en) * | 2022-02-22 | 2022-05-13 | 北京博数智源人工智能科技有限公司 | Early warning method and device for furnace tube leakage accident of thermal power plant |
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Application publication date: 20200508 |