CN111854668A - Blast furnace lining thickness calculation device and method based on distributed optical fiber temperature measurement - Google Patents
Blast furnace lining thickness calculation device and method based on distributed optical fiber temperature measurement Download PDFInfo
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- CN111854668A CN111854668A CN202010868955.4A CN202010868955A CN111854668A CN 111854668 A CN111854668 A CN 111854668A CN 202010868955 A CN202010868955 A CN 202010868955A CN 111854668 A CN111854668 A CN 111854668A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 118
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000004364 calculation method Methods 0.000 title claims description 25
- 230000003628 erosive effect Effects 0.000 claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000012546 transfer Methods 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 230000004907 flux Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- 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
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
- G01B21/085—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness using thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Blast Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to a device and a method for calculating the thickness of a blast furnace lining based on distributed optical fiber temperature measurement, and belongs to the technical field of blast furnaces. The device comprises a refractory lining, joint filler, cooling equipment, a blast furnace shell, a distributed optical fiber, an optical fiber sensing temperature measurement system and a blast furnace hearth temperature database; based on the optical fiber temperature measurement principle, the optical fibers are laid in the inner lining of the industrial furnace along the circumferential direction and the height direction of the inner lining of the furnace, so that the Rayleigh, Raman and Brillouin scattering light obtained from each scattering region in the optical fibers can be used for obtaining the temperature of the corresponding position of the corresponding scattering region, and the lowest distance between adjacent temperature measurement points can reach a millimeter level; meanwhile, the heat flux strength and the residual thickness of the lining of the blast furnace hearth are calculated by utilizing the heat transfer principle, so that the traditional thermocouple temperature monitoring mode can be replaced, the abnormal erosion point of the lining can be positioned within 24 hours of the temperature and the residual thickness of the lining of the blast furnace hearth, the safety production risk of the blast furnace is reduced, and the guarantee is provided for the high-efficiency safety production of the blast furnace.
Description
Technical Field
The invention belongs to the technical field of blast furnaces, and relates to a device and a method for calculating the thickness of a furnace lining of a blast furnace based on distributed optical fiber temperature measurement.
Background
The blast furnace is used as a main method of modern iron making at present, the iron yield of the blast furnace accounts for more than 90 percent of the total iron making yield in the world, and the blast furnace is the leading iron making equipment which is most efficient, low in consumption and environment-friendly at present. However, in recent years, blast furnaces at home and abroad frequently have burning-through accidents of inner linings and suffer from abnormal erosion of hearth inner lining carbon bricks, some blast furnaces are burnt through even in 1 to 2 years of operation, the production life of the blast furnaces is greatly shortened, the safety production of the blast furnaces is seriously threatened, and huge economic losses are caused to enterprises. Therefore, the thickness of the blast furnace lining is monitored in real time, the blast furnace is prevented from being burnt through, and the method has extremely important significance for the production and operation of the blast furnace.
The blast furnace is a black box with extremely severe environment, and the lining temperature of the blast furnace hearth is mainly monitored by a thermocouple arranged in the blast furnace lining at present, and the lining thickness of the blast furnace hearth is calculated according to the thermocouple temperature and a heat transfer model. However, the number of the openings of the furnace shell is limited safely, and the thermocouples in the circumferential direction are generally spaced by 1-3 m, so that the number of the temperature monitoring is limited, the circumferential direction of the hearth cannot be detected in a full-coverage manner, the obtained residual thickness monitoring of the hearth lining has a large monitoring blind area, the omnibearing and full-coverage monitoring of the thickness of the blast furnace lining cannot be realized, and great potential safety hazards are brought to the production of the blast furnace.
Therefore, how to realize the monitoring of the thickness of the blast furnace lining for 24 hours without blind areas and full coverage, accurately and quickly locate the abnormal erosion point of the hearth lining and ensure the safe and long-life production of the blast furnace is one of the key problems which are urgently solved at present.
Disclosure of Invention
In view of the above, the invention aims to provide a device and a method for calculating the thickness of a lining of a blast furnace based on distributed optical fiber temperature measurement, which are used for realizing 24-hour blind-area-free and omnibearing monitoring of the thickness of a lining of the blast furnace, particularly the lining of the blast furnace hearth, accurately and quickly positioning an abnormal erosion point of the lining of the hearth, reducing the safety risk of blast furnace production and providing guarantee for high-efficiency and safe production of the blast furnace.
In order to achieve the purpose, the invention provides the following technical scheme:
a blast furnace lining thickness calculating device based on distributed optical fiber temperature measurement comprises a refractory lining, a joint filler, a cooling device, a blast furnace shell, a distributed optical fiber, an optical fiber sensing temperature measuring system and a blast furnace hearth temperature database;
the refractory lining is in a circular ring shape, and joint filling materials, cooling equipment and a blast furnace shell are sequentially covered outwards;
the refractory lining is provided with a groove, and distributed optical fibers are laid along the circumference and the height direction of the blast furnace hearth;
the starting end and the tail end of the distributed optical fiber are connected with an optical fiber sensing temperature measuring system;
and the optical fiber sensing temperature measuring system is connected with a blast furnace hearth temperature database.
Optionally, the distributed optical fiber is laid in at least 2 rings along the circumference of the refractory lining.
Optionally, the distributed optical fiber is laid in multiple layers along the height direction of the refractory lining.
Optionally, the location of the groove is on the upper surface of the refractory lining.
A blast furnace lining thickness calculation method based on distributed optical fiber temperature measurement comprises the following steps:
1) slotting on the lining of the blast furnace hearth, and laying distributed optical fibers along the circumference and the height direction of the blast furnace hearth;
2) connecting the starting end and the tail end of the distributed optical fiber with an optical fiber sensing temperature measuring system;
3) the optical fiber sensing temperature measuring system collects the temperature T of the hearth lining along the optical fiber pathij、Tij', and will be at temperature Tij、Tij' store into blast furnace hearth temperature database;
4) initializing highest temperature T of hearth liningmax；
5) Extracting temperature data T of temperature measuring point of each layer of optical fiber from blast furnace hearth temperature databaseij、Tij’；
6) Extracting temperature data T of optical fiberijAnd the highest temperature T of the lining of the initial hearthmaxComparing;
7) when T isij＞TmaxWhen it is, T will beijAssigning data to Tmax；
8) Introducing refractory parameters of a blast furnace hearth, design parameters of the blast furnace hearth and optical fiber arrangement parameters, and calculating heat flow intensity q between temperature measuring points of the optical fiber by using a Fourier heat transfer formulaij；
9) According to the obtained heat flow intensity qijAnd calculating the isothermal line at 1150 ℃ to obtain the thickness S of the hearth liningij；
10) According to the calculated thickness S of the hearth liningijDrawing a lining erosion line of the furnace hearth, including drawing a lining erosion line in the circumferential direction and a lining erosion line in the height direction;
11) when T isij≤TmaxIn the process, the lining of the furnace hearth is not corroded, calculation is not carried out, and the step 10) is directly carried out to draw a corrosion line of the lining of the furnace hearth;
12) finally, displaying the erosion line of the hearth lining in real time on line to guide the production and operation of the blast furnace;
13) and (5) repeating the steps 5) to 12), and continuously and repeatedly calculating the erosion thickness of the hearth lining to realize dynamic monitoring of the thickness change of the hearth lining.
Optionally, at least 2 rings of the distributed optical fibers are laid along the circumferential direction of the blast furnace lining; and the distributed optical fibers are laid in multiple layers along the height direction of the blast furnace lining.
Optionally, the spatial resolution of the distributed optical fiber laid along the circumferential direction and the height direction is less than 0.5 m.
Optionally, the position of the notch is located on the upper surface of the blast furnace lining.
Optionally, in the step 8), the heat flow intensity q isijThe calculation formula is as follows:
in the formula, qijRepresents the heat flow intensity between the temperature measuring points of the inner ring fiber and the outer ring fiber, w/m2；
TijThe temperature point of the optical fiber laid on the inner ring of the blast furnace lining of each layer is represented as DEG C;
Tij' denotes the temperature point, DEG C, of the optical fiber laid in each layer on the outer ring of the blast furnace lining;
L0representing the arrangement spacing m of the inner ring optical fiber and the outer ring optical fiber of each layer;
lambda represents the thermal conductivity of the blast furnace lining, w/m.DEG C;
i represents the number of temperature measurement points of the optical fiber in the circumferential direction, and i is 1, 2 and 3.
j denotes the number of optical fiber layers in the height direction, and j is 1, 2, 3.
Optionally, in the step, the thickness S of the hearth liningijThe calculation formula is as follows:
in the formula, SijRepresents the remaining thickness of the lining of the blast furnace, m;
qijrepresents the heat flow intensity between the temperature measuring points of the inner ring fiber and the outer ring fiber, w/m2；
1150 ℃ represents the temperature of the solidification line of the blast furnace slag iron, and the temperature is usually taken as an isotherm of the corrosion of the lining;
L1the distance m between the inner ring optical fiber and the cold surface of the blast furnace lining is shown.
The invention has the beneficial effects that: according to the scheme, based on the optical fiber temperature measurement principle, the optical fibers are laid in the inner lining of the industrial furnace along the circumferential direction and the height direction of the inner lining of the furnace, so that the temperature of the corresponding position of the corresponding scattering area can be obtained by utilizing Rayleigh, Raman and Brillouin scattering light obtained from each scattering area in the optical fibers, and the distance between adjacent temperature measurement points can reach a millimeter level; meanwhile, the heat flux strength and the residual thickness of the lining of the blast furnace hearth can be calculated quickly and accurately in real time by utilizing the heat transfer principle, so that the traditional thermocouple temperature monitoring mode can be replaced, the 24-hour blind area-free and omnibearing monitoring on the temperature and the residual thickness of the lining of the blast furnace hearth can be realized, the abnormal erosion point of the lining can be accurately and quickly positioned, the safety production risk of the blast furnace is reduced, and the guarantee is provided for the high-efficiency safety production of the blast furnace.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of a blast furnace lining thickness calculation method based on distributed optical fiber temperature measurement according to the present invention;
FIG. 2 is a schematic view of a configuration in which optical fibers are arranged in the circumferential direction of the inner lining of the hearth of the blast furnace;
FIG. 3 is a schematic structural view of an optical fiber arranged in the height direction of the lining of the hearth of the blast furnace;
FIG. 4 is a schematic view of the cross-sectional structure A-A in FIG. 2;
FIG. 5 is a schematic view of a circumferential erosion profile of a blast furnace hearth lining;
FIG. 6 is a schematic view showing the erosion profile in the height direction of the blast furnace hearth lining.
Reference numerals: 1-refractory lining; 2-joint compound filling; 3-a cooling device; 4-blast furnace shell; 5-a distributed optical fiber; 6-high-temperature molten iron; 7-circumferential erosion contour lines of the blast furnace hearth lining; 8-erosion contour lines of the blast furnace hearth lining in the height direction; 9-optical fiber sensing temperature measuring system; 10-blast furnace hearth temperature database.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 6, the present embodiment provides a method for calculating a thickness of a lining of a blast furnace based on distributed optical fiber temperature measurement, including the following steps:
1) aiming at a newly-built or overhauled blast furnace, when a hearth refractory lining 1 is built in a blast furnace hearth, a 2-ring annular groove is formed in the upper surface of the refractory lining 1, the existing thermocouple hole or newly-opened hole is utilized to introduce the distributed optical fiber 2 into the blast furnace hearth, the distributed optical fiber 5 is laid in the refractory lining 1 along the annular groove, after the laying is finished, the annular groove is filled with an unformed refractory material with the same performance as that of the refractory lining 1, and the distributed optical fiber 2 is ensured to be in close contact with the refractory lining 1. And (3) laying 2 rings of distributed optical fibers 2 on the upper surface of the refractory lining 1 every time the refractory lining 1 is laid.
2) The initial section and the tail end of the distributed optical fiber 2 laid in the refractory lining 1 of the blast furnace are connected with an optical fiber sensing temperature measuring system 9, and the optical fiber sensing temperature measuring system 9 is connected with a blast furnace hearth temperature database 10.
3) Starting the optical fiber sensing temperature measuring system 9, the optical fiber sensing temperature measuring system 9 will collect the temperature T of the refractory lining 1 of the blast furnace hearth along the path of the distributed optical fiber 1ij、Tij', and stored in the blast furnace hearth temperature database 10.
4) Initializing the highest temperature T of the refractory lining of the blast furnace hearthmaxAnd the judgment basis is convenient for the first calculation of the system when the temperature is 25 ℃.
5) Extracting temperature data T of temperature measuring points of the 2-ring distributed optical fiber 2 in each layer of refractory lining 1 from a blast furnace hearth temperature database 10ij、Tij’。
6) The thickness of the lining of the furnace hearth is calculated, and the temperature data T of the inner ring optical fiber of each layer is extractedijAnd the highest temperature T of the lining of the initial hearthmaxA comparison is made.
7) When T isij＞TmaxThen, the inner ring temperature data T proposed this time is usedijAssigning data to TmaxAnd stored to replace the initial hearth lining maximum temperature TmaxValue as T at the time of the next round calculationmaxThe value is obtained.
8) Introducing refractory parameters of a blast furnace hearth, design parameters of the blast furnace hearth and optical fiber arrangement parameters, and calculating the heat flow intensity q between temperature measuring points of the distributed optical fiber 2 by using a Fourier heat transfer formulaijThe calculation formula is as follows:
in the formula, qijThe intensity of heat flow between the temperature measuring points of the inner ring optical fiber and the outer ring optical fiber is w/m2；
Tij-the temperature point, c, of the optical fibre laid in each layer on the inner ring of the blast furnace lining;
Tij' -temperature point of optical fiber laid on outer ring of blast furnace lining in each layer, ° c;
L0-m is the arrangement spacing of the inner and outer ring optical fibers in each layer;
lambda-is the thermal conductivity of the blast furnace lining, w/m.DEG C;
i-represents the number of temperature measurement points of the optical fiber in the circumferential direction, wherein i is 1, 2 and 3.
j-represents the number of optical fiber layers in the height direction, j being 1, 2, 3.
9) According to the obtained heat flow intensity qijAnd calculating the temperature of the isothermal line at 1150 ℃ to obtain the thickness S of the refractory lining 1 of the hearthijThe calculation formula is as follows:
in the formula, Sij-is the residual thickness of the lining of the blast furnace, m;
qijthe intensity of heat flow between the temperature measuring points of the inner ring optical fiber and the outer ring optical fiber is w/m2；
1150 ℃ is the temperature of the solidification line of the blast furnace slag iron, and the temperature is usually used for representing the isotherm of the erosion of the lining;
L1the distance m between the inner ring optical fiber and the cold surface of the blast furnace lining is defined as the distance.
10) According to the calculated thickness S of the refractory lining 1 of the hearthijDrawing an erosion line of the hearth lining, and collecting the thickness value S of each layer of the refractory lining 1 in the circumferential direction1j、S2j、S3j、S4j、……、SnjDrawing an erosion line 7 on the inner liner in the circumferential direction of each layer; the thickness value S of the refractory lining 1 in the height direction of each section is collectedi1、Si2、Si3、Si4、……、SinAnd drawing a lining erosion line 8 in the height direction, thereby monitoring the thickness of the refractory lining 1 of the blast furnace hearth in a real-time full-coverage manner.
11) When T isij≤TmaxAnd (3) during the period of extracting the temperature data, the lining of the furnace hearth is not corroded, calculation is not carried out, and the step 10) is directly carried out to draw the corrosion line of the lining of the furnace hearth.
12) Finally, the erosion line of the hearth lining is displayed on line in real time to guide the production and operation of the blast furnace.
13) And (5) repeating the steps 5) to 12), and continuously and repeatedly calculating the erosion thickness of the hearth lining to realize dynamic monitoring of the thickness change of the hearth lining.
The specific embodiment is as follows: taking a certain blast furnace hearth as an example, 2 rings of distributed optical fibers 2 are arranged on each layer of inner ring lining 1 of the blast furnace hearth, and because the distributed optical fibers can be provided with a plurality of points along an optical fiber path, for convenience of display, only 25 optical fiber temperature measuring points are arranged in the circumferential direction of each layer of inner ring lining 1.
2-layer temperature measuring optical fiber 2 interval L in circumferential direction0100mm, distance L between inner ring optical fiber and inner liner cold surface1＝200mm。
The thermal conductivity λ of the refractory lining 1 is 18w/m ° c;
the melting temperature of the iron condensing layer is 1150 ℃;
initializing the highest temperature T of the refractory lining of the blast furnace hearthmax＝25℃
When the temperature measurement data T of the 2-ring distributed optical fiber 2 in each layer of the refractory lining 1 is extracted from the blast furnace hearth temperature database 10 at a certain timeij、Tij' is shown in Table 1 below.
TABLE 1
According to the calculation method, the thickness S of the hearth lining 1 can be calculatedijAt this time Tij＞TmaxWhen calculating, will TijValue assignment to TmaxAnd storage is carried out, so that the next calculation is convenient. Specifically, as shown in table 2 below.
TABLE 2
Circumferential liner erosion lines 7 can be drawn according to table 2, as shown in fig. 3.
When the temperature measurement data T of the 2-ring distributed optical fiber 2 in each layer of the refractory lining 1 is extracted from the blast furnace hearth temperature database 10 at a certain timeij、Tij' some points in the formula have values below TmaxWhen the value is greater than the value, it means that the refractory lining 1 corresponding to the point is not eroded, and the points are not calculated at this time, but S calculated last time is usedijInstead, as shown in table 3 below.
TABLE 3
And drawing a lining erosion line 7 in the circumferential direction according to the table 3, thereby continuously extracting the temperature of the distributed optical fiber 2 and calculating the thickness of the hearth lining 1 in real time.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a blast furnace lining thickness calculating device based on distributed optical fiber temperature measurement which characterized in that: the device comprises a refractory lining, joint filler, cooling equipment, a blast furnace shell, a distributed optical fiber, an optical fiber sensing temperature measurement system and a blast furnace hearth temperature database;
the refractory lining is in a circular ring shape, and joint filling materials, cooling equipment and a blast furnace shell are sequentially covered outwards;
the refractory lining is provided with a groove, and distributed optical fibers are laid along the circumference and the height direction of the blast furnace hearth;
the starting end and the tail end of the distributed optical fiber are connected with an optical fiber sensing temperature measuring system;
and the optical fiber sensing temperature measuring system is connected with a blast furnace hearth temperature database.
2. The device for calculating the thickness of the lining of the blast furnace based on the distributed optical fiber temperature measurement is characterized in that: the distributed optical fibers are laid in at least 2 rings along the circumference of the refractory lining.
3. The blast furnace lining thickness calculation device based on distributed optical fiber temperature measurement according to claim 1, wherein: and multiple layers of distributed optical fibers are laid along the height direction of the refractory lining.
4. The blast furnace lining thickness calculation device based on distributed optical fiber temperature measurement according to claim 1, wherein: the location of the trough is on the upper surface of the refractory lining.
5. A blast furnace lining thickness calculation method based on distributed optical fiber temperature measurement is characterized by comprising the following steps: the method comprises the following steps:
1) slotting on the lining of the blast furnace hearth, and laying distributed optical fibers along the circumference and the height direction of the blast furnace hearth;
2) connecting the starting end and the tail end of the distributed optical fiber with an optical fiber sensing temperature measuring system;
3) the optical fiber sensing temperature measuring system collects the temperature T of the hearth lining along the optical fiber pathij、Tij', and will be at temperature Tij、Tij' store into blast furnace hearth temperature database;
4) initializing highest temperature T of hearth liningmax；
5) Extracting temperature data T of temperature measuring point of each layer of optical fiber from blast furnace hearth temperature databaseij、Tij’；
6) Extracting temperature data T of optical fiberijAnd the highest temperature T of the lining of the initial hearthmaxRatio of performanceComparing;
7) when T isij＞TmaxWhen it is, T will beijAssigning data to Tmax；
8) Introducing refractory parameters of a blast furnace hearth, design parameters of the blast furnace hearth and optical fiber arrangement parameters, and calculating heat flow intensity q between temperature measuring points of the optical fiber by using a Fourier heat transfer formulaij；
9) According to the obtained heat flow intensity qijAnd calculating the isothermal line at 1150 ℃ to obtain the thickness S of the hearth liningij；
10) According to the calculated thickness S of the hearth liningijDrawing a lining erosion line of the furnace hearth, including drawing a lining erosion line in the circumferential direction and a lining erosion line in the height direction;
11) when T isij≤TmaxIn the process, the lining of the furnace hearth is not corroded, calculation is not carried out, and the step 10) is directly carried out to draw a corrosion line of the lining of the furnace hearth;
12) finally, displaying the erosion line of the hearth lining in real time on line to guide the production and operation of the blast furnace;
13) and (5) repeating the steps 5) to 12), and continuously and repeatedly calculating the erosion thickness of the hearth lining to realize dynamic monitoring of the thickness change of the hearth lining.
6. The blast furnace lining thickness calculation method based on distributed optical fiber temperature measurement according to claim 5, characterized in that: at least 2 rings of distributed optical fibers are laid along the circumferential direction of the blast furnace lining; and the distributed optical fibers are laid in multiple layers along the height direction of the blast furnace lining.
7. The blast furnace lining thickness calculation method based on distributed optical fiber temperature measurement according to claim 6, characterized in that: the spatial resolution of the distributed optical fiber laid along the circumferential direction and the height direction is less than 0.5 m.
8. The blast furnace lining thickness calculation method based on distributed optical fiber temperature measurement according to claim 5, characterized in that: the position of the notch is positioned on the upper surface of the blast furnace lining.
9. The blast furnace lining thickness calculation method based on distributed optical fiber temperature measurement according to claim 5, characterized in that: in the step 8), the heat flow intensity qijThe calculation formula is as follows:
in the formula, qijRepresents the heat flow intensity between the temperature measuring points of the inner ring fiber and the outer ring fiber, w/m2；
TijThe temperature point of the optical fiber laid on the inner ring of the blast furnace lining of each layer is represented as DEG C;
Tij' denotes the temperature point, DEG C, of the optical fiber laid in each layer on the outer ring of the blast furnace lining;
L0representing the arrangement spacing m of the inner ring optical fiber and the outer ring optical fiber of each layer;
lambda represents the thermal conductivity of the blast furnace lining, w/m.DEG C;
i represents the number of temperature measurement points of the optical fiber in the circumferential direction, and i is 1, 2 and 3.
j denotes the number of optical fiber layers in the height direction, and j is 1, 2, 3.
10. The blast furnace lining thickness calculation method based on distributed optical fiber temperature measurement according to claim 1, characterized in that: in the step, the thickness S of the hearth liningijThe calculation formula is as follows:
in the formula, SijRepresents the remaining thickness of the lining of the blast furnace, m;
qijrepresents the heat flow intensity between the temperature measuring points of the inner ring fiber and the outer ring fiber, w/m2；
1150 ℃ represents the temperature of the solidification line of the blast furnace slag iron, and the temperature is usually taken as an isotherm of the corrosion of the lining;
L1the distance m between the inner ring optical fiber and the cold surface of the blast furnace lining is shown.
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| CN113237447A (en) * | 2021-04-21 | 2021-08-10 | 武汉钢铁有限公司 | Method for estimating thickness of carbon brick on side wall of blast furnace hearth |
| CN113667784A (en) * | 2021-06-28 | 2021-11-19 | 鞍钢股份有限公司 | Method for judging erosion condition of blast furnace hearth |
| CN114292973A (en) * | 2021-12-17 | 2022-04-08 | 山东莱钢永锋钢铁有限公司 | Method for estimating and monitoring temperature of refractory material in blast furnace lining |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237447A (en) * | 2021-04-21 | 2021-08-10 | 武汉钢铁有限公司 | Method for estimating thickness of carbon brick on side wall of blast furnace hearth |
| CN113667784A (en) * | 2021-06-28 | 2021-11-19 | 鞍钢股份有限公司 | Method for judging erosion condition of blast furnace hearth |
| CN114292973A (en) * | 2021-12-17 | 2022-04-08 | 山东莱钢永锋钢铁有限公司 | Method for estimating and monitoring temperature of refractory material in blast furnace lining |
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