CN114350873A - Blast furnace iron runner erosion line position determination method - Google Patents
Blast furnace iron runner erosion line position determination method Download PDFInfo
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- CN114350873A CN114350873A CN202210065984.6A CN202210065984A CN114350873A CN 114350873 A CN114350873 A CN 114350873A CN 202210065984 A CN202210065984 A CN 202210065984A CN 114350873 A CN114350873 A CN 114350873A
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- iron runner
- thermocouple
- layer
- copper plate
- iron
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 90
- 230000003628 erosive effect Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 22
- 239000010949 copper Substances 0.000 claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000011819 refractory material Substances 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 238000010276 construction Methods 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 57
- 239000011449 brick Substances 0.000 claims description 22
- 239000004927 clay Substances 0.000 claims description 21
- 239000011229 interlayer Substances 0.000 claims description 2
- 238000013316 zoning Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 abstract description 11
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 238000004364 calculation method Methods 0.000 description 8
- 239000004576 sand Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000008531 maintenance mechanism Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Blast Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a blast furnace iron runner erosion line position determination method, wherein a layer of copper plate is pre-embedded on the outer surface of an iron runner permanent layer during construction and building, and each copper plate can monitor the temperature condition of an iron runner refractory material in a coverage area; thermocouples are arranged on the outer side of the copper plate and in the steel grooves in the corresponding areas, the distance between every two adjacent transverse thermocouples is less than 1m, and the thermocouple wire ends of the thermocouples are in close contact with the copper plate; a thermocouple protective sleeve is arranged on the outer side of the thermocouple, and a signal is led to a thermocouple collecting box through a compensating lead; rejecting unreasonable data collected by a thermocouple collection box; judging the position of an erosion line at 1150 ℃ according to the temperature field, wherein the iron runner erosion line is controlled to be in the residual thickness of the working layer; the problem that a large number of blind areas exist in the existing iron runner monitoring is solved, each partition is simulated into a one-dimensional steady-state temperature field, the temperature field in the lining of the iron runner of each partition is calculated through a two-point method, the position of an erosion line at 1150 ℃ is judged according to the temperature field, and then the erosion condition of each partition of the iron runner is judged.
Description
Technical Field
The invention belongs to the technical field of blast furnace iron runner processes, and particularly relates to a blast furnace iron runner erosion line position determination method.
Background
In the judgment of the service life of the iron runner, the service life of most blast furnace iron runners is generally judged by experience (such as iron tapping amount and iron tapping days), and a reliable detection means is lacked; in order to accurately grasp the thickness of the residual refractory material of the iron runner, tools for measuring the thickness of the residual refractory material are developed at home and abroad, and weak parts are regularly measured to serve as a basis for judging the thickness of the residual refractory material, but real-time monitoring cannot be realized, comprehensive inspection cannot be realized, and parts with serious local erosion can be missed to be inspected; with the use of thermocouples, the newly-built blast furnace generally adopts a pre-buried thermocouple mode to measure the temperature outside the iron runner, and the erosion degree of the iron runner is judged by combining the temperature change with the production experience. No matter what the above-mentioned mode, judge that the iron runner corrodes the degree mainly or relies on people's experience to can only judge to local (inspection position or installation galvanic couple position), and the judgement mode that relies on the experience varies from person to person, and the randomness is great, appears because the inspection is not in place very easily and takes place that main runner local burns out and causes the iron leakage accident in the actual production process.
Disclosure of Invention
The invention aims to provide a blast furnace iron runner erosion line position determination method.
The technical scheme adopted by the invention for solving the technical problems is as follows: a blast furnace iron runner erosion line position determination method comprises the following steps:
1) when in construction and masonry, a layer of copper plate is embedded in the outer surface of the iron runner permanent layer, each iron hook can be divided into 18-30 areas according to the length, and each copper plate can monitor the temperature condition of the refractory material of the iron runner in the covered area so as to form a stable temperature field;
2) thermocouples are arranged on the outer side of the copper plate and in the steel grooves in the corresponding areas, the distance between every two adjacent transverse thermocouples is less than 1m, and the thermocouple wire ends of the thermocouples are in close contact with the copper plate;
3) a thermocouple protective sleeve is arranged on the outer side of the thermocouple, and a signal is led to a thermocouple collecting box through a compensating lead;
4) rejecting unreasonable data collected by a thermocouple collection box; and (3) judging the position of an erosion line at 1150 ℃ according to the temperature field, wherein the iron runner erosion line is controlled to be in the residual thickness of the working layer, and the heat transfer control equation is as follows:
wherein, λ 1 is the thermal conductivity of the working layer of the iron runner, λ 2 is the thermal conductivity of the permanent layer of the iron runner, λ 3 is the thermal conductivity of the clay insulating brick, t0 is the temperature of the inner surface of the steel bath corresponding to the partition, t1 is the temperature of the interface between the permanent layer and the working layer, tw is the temperature detected by galvanic couple, Δ h is the residual thickness of the working layer of the iron runner, h1 is the thickness of the permanent layer of the iron runner, and h2 is the thickness of the clay insulating brick.
5) Specifically, the iron hook is provided with a permanent layer and a working layer, clay heat-insulating bricks are arranged on the outer side and the bottom of the permanent layer, sand filling layers are arranged on the outer sides of the clay heat-insulating bricks, clay refractory bricks are arranged on the bottoms of the clay heat-insulating bricks and the outer sides of the sand filling layers, and heat-resistant concrete is arranged on the outer sides of the clay refractory bricks.
The invention has the following beneficial effects: the method comprises the steps of carrying out partition control on the iron runner, solving the problem that a large number of blind areas exist in the existing iron runner monitoring, simulating each partition into a one-dimensional steady-state temperature field, calculating the temperature field in the lining of the iron runner of each partition by a two-point method, judging the position of an erosion line at 1150 ℃ according to the temperature field, and further judging the erosion condition of each partition of the iron runner.
Drawings
FIG. 1 is a schematic cross-sectional view of a widthwise portion of an iron runner.
Fig. 2 is an enlarged view taken at a-a of fig. 1.
In the figure: 1-a permanent layer; 2-a working layer; 3-a thermocouple; 4-thermocouple protective sleeve; 5-a compensation wire; 6-heat-resistant concrete; 7-clay refractory bricks; 8-filling a sand layer; 9-steel shell; 10-clay insulating brick; 11-copper plate.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-2, the blast furnace iron runner erosion line position determination method comprises a permanent layer 1, a working layer 2, a thermocouple 3, a thermocouple protection sleeve 4, a compensation lead 5, heat-resistant concrete 6, clay refractory bricks 7, a sand-filled layer 8, a steel shell 9, clay heat-insulating bricks 10 and a copper plate 11.
A blast furnace iron runner erosion line position determination method comprises the following steps:
1) when in construction and masonry, a layer of copper plate 11 (one is embedded on each of two sides of the iron runner) is embedded on the outer surface of the permanent layer of the iron runner, each main runner can be divided into 18-30 distributed unequally according to the length, and each copper plate 11 can monitor the temperature condition of the refractory material of the iron runner in the coverage area. Two layers of thermocouples 3 are arranged on the outer side of the copper plate 11 and the steel tank in the corresponding area, the distance between the two transverse thermocouples 3 is less than 1m, the thermocouple wire ends of the thermocouples 3 are in close contact with the copper plate 11, the temperature measured by the thermocouples 3 is not only one point, but also one surface with the thermocouples 3 as the center, so that the thermocouples 3 can accurately and safely measure the real-time temperature of the copper plate coverage area in real time, and the blind area of a common thermocouple monitoring device is eliminated. The copper plate 11 is preset on the outer surface of the permanent layer 1 when the iron runner is poured, so that the structure and other properties of the whole iron runner are not affected; in order to protect the thermocouple and facilitate the replacement of the thermocouple, a thermocouple protection sleeve 4 is installed at a corresponding position; the signal is directed to the thermocouple collection box by a compensating lead 5. The device can monitor the temperature change of the iron runner comprehensively without dead zones, judge the corrosion condition of the iron runner, adapt to the complex working environment of the iron runner and solve the problem that the local temperature cannot be detected to be too high due to low heat conductivity coefficient of the refractory material of the iron runner; by adopting the replaceable thermocouple, the thermocouple 3 can be conveniently replaced after the thermocouple is damaged.
2) Calculating an iron runner erosion line: dividing the lining into a permanent layer 1 and a working layer 2 according to the difference of the lining of the iron runner made of refractory materials, wherein the maintenance and the construction of the iron runner are carried out on the working layer 2, and the erosion line of the iron runner is controlled to be the residual thickness of the working layer; a layer of clay heat insulation brick in the steel shell belongs to a heat insulation material and has large temperature gradient. The distribution considers the heat transfer of the permanent layer 1 and the working layer 2 as a one-dimensional steady heat transfer process; the clayey insulating brick has large temperature gradient, influences driving school on calculation result, and can be regarded as a steady heat transfer process to obtain a heat transfer control equation
Wherein λ is1Is the heat conductivity coefficient, lambda, of the working layer of the iron runner2Is the thermal conductivity, lambda, of the permanent layer of the iron runner3Is the heat conductivity coefficient, t, of the clay insulating brick0For zoning the temperature of the inner surface of the corresponding steel channel, t1Temperature at the interface of the permanent layer and the working layer, twFor the temperature detected by the couple, Delta h is the working layer of the iron runnerResidual thickness, h1Is the thickness of the permanent layer of the iron runner h2The thickness of the clay interlayer thermal brick is shown.
3) The working environment of the blast furnace iron runner thermocouple is severe and is easy to damage, although the thermocouple can be replaced, the existence of bad points can not be completely eliminated, unreasonable data must be eliminated to ensure the correctness of the calculation result, and the accuracy of judging the erosion line is improved.
The invention solves the problem that the ordinary iron runner galvanic couple preset scheme can not comprehensively monitor the temperature change of the iron runner, and realizes comprehensive monitoring according to the operation characteristics of the iron runner by using the copper plate 11 to control the iron runner in a subarea way; the iron runner is controlled in a partition mode according to a finite element method, a one-dimensional steady-state heat conduction equation is established in each partition mode, the temperature field in the iron runner lining is calculated, the calculation method is simple, the calculation amount is small, the method is suitable for the iron runner erosion characteristic, and the calculation stability and accuracy meet the monitoring requirement of the blast furnace iron runner. The method can realize on-line monitoring and automatic early warning of the temperature field distribution of the iron runner, is beneficial to the blast furnace operators to timely master the corrosion evolution law and the corrosion thickness change of the lining of the iron runner, prevents the iron runner from burning through, establishes a reasonable iron runner maintenance mechanism and a refractory use standard, finally reduces the consumption of ton iron refractory, and prevents and reduces safety accidents.
Key point and protection point of the invention
1) Establishing an iron runner temperature monitoring device by using a copper plate;
2) finite element simulation division is carried out on the iron runner, so that comprehensive monitoring of the iron runner is realized;
3) the model building method is characterized in that each partition builds a one-dimensional steady-state heat conduction equation according to the model building method, and the calculation method is simple;
and (2) carrying out steady-state heat conduction calculation, wherein the grid position is fixed, although the iron runner is divided into different areas such as a side wall, a bottom, a combination part and the like, the heat conduction coefficient of the used material is stable, and the poured iron runner refractory is made of the same material used for the heat insulation material, the side wall and the bottom, and has little influence on the whole temperature field, so that a stable two-dimensional temperature field can be formed, the thermocouple arranged on the grid node is used for providing data, and the temperature of the whole node on the grid outside the iron runner is calculated by adopting a finite element method.
And establishing a two-dimensional temperature field outside the iron runner according to the calculation result, and calculating the position of the 1150 ℃ erosion line at the position of the iron runner by adopting a two-point method to obtain the residual lining thickness of the position. According to the difference that the lining of the iron runner uses the refractory material, the lining is divided into a permanent layer and a working layer, the maintenance and the construction of the iron runner are carried out on the working layer, and the erosion line of the iron runner is controlled to be the residual thickness of the working layer. The distribution considers the heat transfer of the permanent layer and the working layer as a one-dimensional steady-state heat transfer process to obtain a heat transfer control equation.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (2)
1. A blast furnace iron runner erosion line position determination method is characterized by comprising the following steps:
1) when in construction and masonry, a layer of copper plate is embedded in the outer surface of the iron runner permanent layer, each iron hook can be divided into 18-30 areas according to the length, and each copper plate can monitor the temperature condition of the refractory material of the iron runner in the covered area so as to form a stable temperature field;
2) thermocouples are arranged on the outer side of the copper plate and in the steel grooves in the corresponding areas, the distance between every two adjacent transverse thermocouples is less than 1m, and the thermocouple wire ends of the thermocouples are in close contact with the copper plate;
3) a thermocouple protective sleeve is arranged on the outer side of the thermocouple, and a signal is led to a thermocouple collecting box through a compensating lead;
4) rejecting unreasonable data collected by a thermocouple collection box; and (3) judging the position of an erosion line at 1150 ℃ according to the temperature field, wherein the iron runner erosion line is controlled to be in the residual thickness of the working layer, and the heat transfer control equation is as follows:
wherein λ is1Is the heat conductivity coefficient, lambda, of the working layer of the iron runner2Is the thermal conductivity, lambda, of the permanent layer of the iron runner3Is the heat conductivity coefficient, t, of the clay insulating brick0For zoning the temperature of the inner surface of the corresponding steel channel, t1Temperature at the interface of the permanent layer and the working layer, twThe temperature detected by the couple, delta h is the residual thickness of the working layer of the iron runner, h1Is the thickness of the permanent layer of the iron runner h2The thickness of the clay interlayer thermal brick is shown.
2. The method as claimed in claim 1, wherein the iron hook is provided with a permanent layer and a working layer, clay insulating bricks are provided on the outer side and bottom of the permanent layer, a sand-filling layer is provided on the outer side of the clay insulating bricks, clay refractory bricks are provided on the bottom of the clay insulating bricks and outer sides of the sand-filling layer, and heat-resistant concrete is provided on the outer sides of the clay refractory bricks.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210065984.6A CN114350873A (en) | 2022-01-20 | 2022-01-20 | Blast furnace iron runner erosion line position determination method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210065984.6A CN114350873A (en) | 2022-01-20 | 2022-01-20 | Blast furnace iron runner erosion line position determination method |
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| CN114350873A true CN114350873A (en) | 2022-04-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114854921A (en) * | 2022-05-06 | 2022-08-05 | 上海宝宬冶金科技有限公司 | Blast furnace iron runner erosion monitoring system with thermocouple capable of being replaced online in real time |
| CN115074471A (en) * | 2022-07-01 | 2022-09-20 | 中钢石家庄工程设计研究院有限公司 | Slag iron runner online intelligent control method, device, system and medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215103364U (en) * | 2021-01-20 | 2021-12-10 | 山东省冶金设计院股份有限公司 | Main iron runner temperature measuring device |
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- 2022-01-20 CN CN202210065984.6A patent/CN114350873A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215103364U (en) * | 2021-01-20 | 2021-12-10 | 山东省冶金设计院股份有限公司 | Main iron runner temperature measuring device |
Non-Patent Citations (1)
| Title |
|---|
| 芶毅等: "高炉铁沟侵蚀监测装置的构建与开发", 《山东冶金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114854921A (en) * | 2022-05-06 | 2022-08-05 | 上海宝宬冶金科技有限公司 | Blast furnace iron runner erosion monitoring system with thermocouple capable of being replaced online in real time |
| CN115074471A (en) * | 2022-07-01 | 2022-09-20 | 中钢石家庄工程设计研究院有限公司 | Slag iron runner online intelligent control method, device, system and medium |
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Application publication date: 20220415 |