CN116793284A - Online monitoring method for residual thickness of castable of main channel of blast furnace - Google Patents
Online monitoring method for residual thickness of castable of main channel of blast furnace Download PDFInfo
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- CN116793284A CN116793284A CN202310725034.6A CN202310725034A CN116793284A CN 116793284 A CN116793284 A CN 116793284A CN 202310725034 A CN202310725034 A CN 202310725034A CN 116793284 A CN116793284 A CN 116793284A
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- temperature
- castable
- steel shell
- residual thickness
- thickness
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 9
- 239000011819 refractory material Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 238000005266 casting Methods 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Blast Furnaces (AREA)
Abstract
The application relates to the technical field of iron making, and discloses an online monitoring method for residual thickness of a main channel castable of a blast furnace, which comprises the following steps: s1, installing a distributed temperature measuring couple at the height of a slag iron wire on the outer side surface of a main ditch permanent layer refractory material; s2, deducing a castable residual thickness calculation method according to a Fourier law; s3, correcting parameters according to actual conditions. According to the method disclosed by the application, the main groove of the distributed temperature measuring couple is arranged at the height of the slag iron wire on the outer side surface of the permanent layer refractory material, a model is built according to a thermodynamic law, the residual thickness of the castable is calculated by collecting the temperature of the couple, the online monitoring of the residual thickness of the castable is realized, the production state of the main groove is controlled in real time, and the safe production is ensured.
Description
Technical Field
The application relates to the technical field of iron making, and particularly discloses an online monitoring method for residual thickness of a main channel castable of a blast furnace.
Background
The existing method for measuring the residual thickness of the castable in the main channel of the blast furnace is carried out after the residual iron is put in a blocking way, and the residual thickness of the castable is not monitored on line. The prior art discloses an on-line monitoring device and method (publication number is CN 113566691A) for a blast furnace tapping main channel, and the scheme disclosed by the prior art only gives an automatic alarm when molten iron erodes to a precast block.
Disclosure of Invention
The application mainly solves the technical problem of providing an online monitoring method for the residual thickness of the castable of the main channel of the blast furnace, which can solve the problem that the online monitoring of the residual thickness of the castable cannot be realized.
In order to solve the technical problems, according to one aspect of the application, more specifically, an on-line monitoring method for the residual thickness of a castable of a main channel of a blast furnace comprises the following steps:
s1, installing a distributed temperature measuring couple at the height of a slag iron wire on the outer side surface of a main ditch permanent layer refractory material;
s2, deducing a castable residual thickness calculation method according to a Fourier law;
s3, correcting parameters according to actual conditions.
Furthermore, in the step S2, the residual thickness of the castable has the following formula:
in the above, s 1 The thickness of the steel shell is m; s is(s) 2 The thickness of the heat insulation layer is m; s is(s) 3 The thickness of the permanent layer is m; s is(s) 4 The thickness of the casting material is m;
t f the temperature of cold air in the steel shell channel is lower than the temperature of the cold air in the steel shell channel; t is t 1 The temperature of the steel shell is the temperature of the steel shell at the interface of the steel shell and cold air; t is t 2 The temperature at the junction of the steel shell and the heat insulation layer is DEG C; t is t 3 Is heat-insulating layer and permanent layer resistantTemperature at the junction of materials (temperature measuring couple), DEG C; t is t 4 The temperature of the junction of the permanent layer refractory and the castable is at the temperature of DEG C; t is t p The temperature is the temperature of slag iron and the temperature is lower than the temperature;
alpha is the heat exchange coefficient between cold air and steel shell, W.m -2 ·℃ -1 ；λ 1 Is the heat conductivity coefficient of the steel shell, W.m -1 ·℃ -1 ；λ 2 Is the heat conductivity coefficient of the heat insulation layer, W.m -1 ·℃ -1 ；λ 3 Is the heat coefficient of the permanent layer, W.m -1 ·℃ -1 ；λ 4 For the heat conductivity coefficient of casting material, W.m -1 ·℃ -1 。
Because the thermal conductivity changes with temperature (the relation between each thermal conductivity and temperature can be obtained through experiments), the accurate residual thickness s of the castable cannot be directly calculated 4 T can be calculated by trial using the following formula 1 、t 2 、t 4 S is calculated again after the heat conductivity coefficient is corrected according to the temperature 4 Until the last two times s 4 Until the calculated results of (a) are equal:
furthermore, in the step S3, because the cooling effect of the cold air on the steel shell in the direction away from the iron notch is inconsistent (the cooling effect of the air inlet is strongest), the heat exchange coefficient α of the position where each thermocouple is located needs to be corrected separately, and the radiant heat received by the steel shell is not considered in the calculation, so that the heat conduction coefficient of the heat insulation layer needs to be corrected, and the correction method comprises: the measured casting material thickness of the new casting main channel and the off-line main channel and the corresponding temperature measurement couple data before off-line are utilized to calculate alpha and lambda according to the calculation 2 And (5) performing correction.
The online monitoring method for the residual thickness of the castable of the main channel of the blast furnace has the beneficial effects that: according to the method disclosed by the application, the main groove of the distributed temperature measuring couple is arranged at the height of the slag iron wire on the outer side surface of the permanent layer refractory material, a model is built according to a thermodynamic law, the residual thickness of the castable is calculated by collecting the temperature of the couple, the online monitoring of the residual thickness of the castable is realized, the production state of the main groove is controlled in real time, and the safe production is ensured.
Drawings
The application will be described in further detail with reference to the accompanying drawings and detailed description.
FIG. 1 is a schematic of the results of the examples.
Detailed Description
The application will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
According to one aspect of the application, there is provided an on-line monitoring method for residual thickness of castable in a main shaft of a blast furnace, comprising the steps of:
and firstly, installing a distributed temperature measuring couple at the height of the slag iron wire on the outer side surface of the main ditch permanent layer refractory material.
Step two, deducing casting material residual thickness calculation method according to Fourier law
The calculation formula of the casting material residual thickness is as follows:
in the above, s 1 The thickness of the steel shell is m; s is(s) 2 The thickness of the heat insulation layer is m; s is(s) 3 The thickness of the permanent layer is m; s is(s) 4 The thickness of the casting material is m;
t f the temperature of cold air in the steel shell channel is lower than the temperature of the cold air in the steel shell channel; t is t 1 The temperature of the steel shell is the temperature of the steel shell at the interface of the steel shell and cold air; t is t 2 The temperature at the junction of the steel shell and the heat insulation layer is DEG C; t is t 3 The temperature of the junction (temperature measuring couple) between the heat insulation layer and the permanent layer refractory material is at the temperature of DEG C; t is t 4 The temperature of the junction of the permanent layer refractory and the castable is at the temperature of DEG C; t is t p The temperature is the temperature of slag iron and the temperature is lower than the temperature;
alpha is the heat exchange coefficient between cold air and steel shell, W.m -2 ·℃ -1 ；λ 1 Is the heat conductivity coefficient of the steel shell, W.m -1 ·℃ -1 ；λ 2 Is the heat conductivity coefficient of the heat insulation layer, W.m -1 ·℃ -1 ；λ 3 Is the heat coefficient of the permanent layer, W.m -1 ·℃ -1 ；λ 4 For the heat conductivity coefficient of casting material, W.m -1 ·℃ -1 。
Because the thermal conductivity changes with temperature (the relation between each thermal conductivity and temperature can be obtained through experiments), the accurate residual thickness s of the castable cannot be directly calculated 4 T can be calculated by trial using the following formula 1 、t 2 、t 4 S is calculated again after the heat conductivity coefficient is corrected according to the temperature 4 Until the last two times s 4 Until the calculated results of (a) are equal:
third, correcting parameters according to actual conditions
Because the cooling effect of the cold air on the steel shell in the direction away from the iron notch is inconsistent (the cooling effect of the air inlet is strongest), the heat exchange coefficient alpha of the position of each temperature measuring couple needs to be corrected independently, the radiant heat received by the steel shell is not considered in the calculation, and therefore, the heat conduction coefficient of the heat insulation layer needs to be corrected, and the correction method comprises the following steps: the measured casting material thickness of the new casting main channel and the off-line main channel and the corresponding temperature measurement couple data are utilized to calculate alpha and lambda according to the calculation formula 2 And (5) performing correction.
Examples
According to the embodiment, the implementation is carried out according to the method, the primary runner of the permanent layer refractory form is adopted in the primary runner of the blast furnace 1# iron notch and the secondary blast furnace 1# iron notch of a certain iron and steel enterprise, 44 temperature measuring couples are installed on the outer side of the permanent layer refractory, after modeling is adopted, the real-time monitoring of the residual thickness of the castable is realized, and the monitoring result is shown in figure 1.
Of course, the above description is not intended to limit the application, but rather the application is not limited to the above examples, and variations, modifications, additions or substitutions within the spirit and scope of the application will be within the scope of the application.
Claims (3)
1. The method for online monitoring the residual thickness of the castable of the main channel of the blast furnace is characterized by comprising the following steps of:
s1, installing a distributed temperature measuring couple at the height of a slag iron wire on the outer side surface of a main ditch permanent layer refractory material;
s2, deducing a castable residual thickness calculation method according to a Fourier law;
s3, correcting parameters according to actual conditions.
2. The method for on-line monitoring of residual thickness of main channel castable of blast furnace according to claim 1, wherein the method comprises the following steps: in the step S2, the calculation formula of the residual thickness of the castable is as follows:
in the above, s 1 The thickness of the steel shell is m; s is(s) 2 The thickness of the heat insulation layer is m; s is(s) 3 The thickness of the permanent layer is m; s is(s) 4 The thickness of the casting material is m;
t f the temperature of cold air in the steel shell channel is lower than the temperature of the cold air in the steel shell channel; t is t 1 The temperature of the steel shell is the temperature of the steel shell at the interface of the steel shell and cold air; t is t 2 The temperature at the junction of the steel shell and the heat insulation layer is DEG C; t is t 3 The temperature of the junction (temperature measuring couple) between the heat insulation layer and the permanent layer refractory material is at the temperature of DEG C; t is t 4 The temperature of the junction of the permanent layer refractory and the castable is at the temperature of DEG C; t is t p The temperature is the temperature of slag iron and the temperature is lower than the temperature;
alpha is the heat exchange coefficient between cold air and steel shell, W.m -2 ·℃ -1 ；λ 1 Is the heat conductivity coefficient of the steel shell, W.m -1 ·℃ -1 ；λ 2 Is the heat conductivity coefficient of the heat insulation layer, W.m -1 ·℃ -1 ；λ 3 Is the heat coefficient of the permanent layer, W.m -1 ·℃ -1 ；λ 4 For the heat conductivity coefficient of casting material, W.m -1 ·℃-1。
Because the thermal conductivity changes with temperature (the relation between each thermal conductivity and temperature can be obtained through experiments), the accurate residual thickness s of the castable cannot be directly calculated 4 T can be calculated by trial using the following formula 1 、t 2 、t 4 S is calculated again after the heat conductivity coefficient is corrected according to the temperature 4 Until the last two times s 4 Until the calculated results of (a) are equal:
3. the method for on-line monitoring of residual thickness of main channel castable of blast furnace according to claim 2, wherein the method comprises the following steps: in the step S3, because the cooling effect of the cold air on the steel shell in the direction away from the iron notch is inconsistent (the cooling effect of the air inlet is strongest), the heat exchange coefficient α of the position where each temperature measuring couple is located needs to be corrected independently, and the radiant heat received by the steel shell is not considered in the calculation, so that the heat conduction coefficient of the heat insulation layer needs to be corrected, and the correction method comprises the following steps: the measured casting material thickness of the new casting main channel and the off-line main channel and the corresponding temperature measurement couple data are utilized to calculate alpha and lambda according to the calculation formula 2 And (5) performing correction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310725034.6A CN116793284A (en) | 2023-06-19 | 2023-06-19 | Online monitoring method for residual thickness of castable of main channel of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310725034.6A CN116793284A (en) | 2023-06-19 | 2023-06-19 | Online monitoring method for residual thickness of castable of main channel of blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116793284A true CN116793284A (en) | 2023-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310725034.6A Pending CN116793284A (en) | 2023-06-19 | 2023-06-19 | Online monitoring method for residual thickness of castable of main channel of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116793284A (en) |
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2023
- 2023-06-19 CN CN202310725034.6A patent/CN116793284A/en active Pending
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