CN118256670A - Abnormal eating and loss early warning method for bottom tuyere of bottom blowing and bottom powder spraying converter - Google Patents
Abnormal eating and loss early warning method for bottom tuyere of bottom blowing and bottom powder spraying converter Download PDFInfo
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- CN118256670A CN118256670A CN202410249842.4A CN202410249842A CN118256670A CN 118256670 A CN118256670 A CN 118256670A CN 202410249842 A CN202410249842 A CN 202410249842A CN 118256670 A CN118256670 A CN 118256670A
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- tuyere
- early warning
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- loss
- blowing
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 22
- 238000007664 blowing Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 title claims abstract description 22
- 238000005507 spraying Methods 0.000 title claims description 5
- 239000007921 spray Substances 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 239000011819 refractory material Substances 0.000 claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000003628 erosive effect Effects 0.000 claims abstract description 12
- 239000001301 oxygen Substances 0.000 claims abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000013277 forecasting method Methods 0.000 claims description 3
- 238000009628 steelmaking Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2300/00—Process aspects
- C21C2300/06—Modeling of the process, e.g. for control purposes; CII
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a method for early warning abnormal eating loss of a bottom tuyere of a bottom blowing and bottom powder injection converter, and belongs to the technical field of steelmaking methods. The technical scheme of the invention is as follows: the method comprises the steps of forming pits on the tuyere and peripheral refractory materials, measuring the caliber L value and the depth H value of the pits, representing the tuyere erosion condition through the change of the L value and the H value, and making a prediction method of the tuyere abnormal erosion. The beneficial effects of the invention are as follows: the method has the advantages that the eating loss condition of the bottom tuyere can be monitored in real time based on online feedback of the bottom thickness measurement data, the practicability is high, the running condition of the bottom tuyere of the bottom oxygen blowing bottom powder injection converter can be intuitively and rapidly monitored, and the safe running of the bottom spray gun is ensured.
Description
Technical Field
The invention relates to a method for early warning abnormal eating loss of a bottom tuyere of a bottom blowing and bottom powder injection converter, and belongs to the technical field of steelmaking methods.
Background
The bottom blowing oxygen bottom powder injection combined blown converter steelmaking process is not introduced and industrially applied in large scale in China since the success of the development abroad in the 70 th century, and has a better metallurgical advantage, and has received high attention in recent years from domestic industries. A bottom spray gun for the bottom blowing oxygen bottom powder injection converter is embedded into the furnace bottom refractory, and a spray gun opening is exposed. The bottom spray gun adopts a double-layer pipe nozzle technology, each nozzle consists of two concentric pipes, oxygen carrying lime powder is blown in from a central pipe of the bottom spray gun in the steelmaking process, and natural gas serving as a coolant is blown in from a circular seam of the double-layer pipe. And a bottom air port is formed at the bottom gun port part in the converting process and is in direct contact with the molten pool. Because the bottom spray gun central tube blows oxygen, when the process control and maintenance are unstable, the spray gun is not matched in shape, and the like, the tuyere and surrounding refractory materials can be abnormally damaged, the corrosion is aggravated, pits are easily formed in the area, the service life of the bottom of the furnace is reduced, and serious safety accidents such as steel leakage, burning explosion of the bottom of the furnace and blowing components and parts occur. Therefore, the development of the tuyere erosion real-time monitoring method, particularly in case of abnormality, can even forecast feedback, and has important significance for ensuring safe and stable operation of the converter.
Disclosure of Invention
The invention aims to provide an abnormal eating and loss early warning method for a bottom tuyere of a bottom-blown oxygen bottom-powder injection converter, which can monitor the eating and loss condition of the bottom tuyere in real time through online feedback based on the thickness measurement data of the bottom of the converter, has strong practicability, can intuitively and rapidly monitor the running condition of the bottom tuyere of the bottom-blown oxygen bottom-powder injection converter, ensures the safe running of a bottom spray gun, and effectively solves the problems in the background art.
The technical scheme of the invention is as follows: an abnormal eating and loss early warning method for a bottom tuyere of a bottom blowing and bottom powder spraying converter comprises the following steps:
(1) A bottom spray gun of the bottom blowing oxygen bottom powder injection converter is put into the furnace bottom refractory material, and a spray gun opening is exposed to form an air opening;
(2) After tapping and deslagging of the converter are finished, measuring the thickness of refractory materials at each part of the bottom of the converter by adopting a fixed thickness gauge;
(3) Abnormal erosion occurs in the air port, pits are formed in the air port and the peripheral refractory material, the caliber L value and the depth H value of the pits are measured, and the air port erosion condition is represented according to the L value and the H value;
(4) And (5) making a forecasting method for abnormal erosion of the tuyere.
In the step (4), when H is more than 200mm, the system is forecasted to start.
After the forecasting system is started, L/H is less than 0.5, and the wind gap is abnormally eroded and red for early warning; yellow early warning is carried out in the range of 0.5< L/H <4 >; L/H is more than 4, the early warning is green, and the tuyere is safe.
Under the yellow early warning condition of the bottom tuyere, the tuyere image morphology is combined, the furnace bottom thickness measurement feedback pit is in a V shape or a W shape, and the comprehensive judgment is carried out after the dynamic regulation and control of the tuyere.
After the red early warning is sent, the tuyere is plugged in time.
In the step (2), every equidistant Deltax in the horizontal direction of the fixed thickness gauge can measure and output a vertical distance H value from the fixed thickness gauge to the furnace bottom. Taking the central axis of a certain bottom spray gun as a base point, and the vertical distance measured by the point is denoted as H 0; taking the central axis of a certain bottom spray gun as a base point, the vertical distance recorded leftwards in the horizontal direction is denoted as H m, and the vertical distance measured rightwards and recorded is denoted as H n; when (H n - Hn-1) is smaller than 20: 20 mm and the values of the subsequent adjacent continuous H n-1- Hn-2、Hn-2 - Hn-3、… 、Hn-9 - Hn-10 are smaller than 20: 20 mm, selecting the value of n at the moment; selecting m value by the same way;
The calculation formulas of L and H are as follows:
L =（m + n）·△x
H =（Hm + Hn）- 2H0。
The beneficial effects of the invention are as follows: the method has the advantages that the eating loss condition of the bottom tuyere can be monitored in real time based on online feedback of the bottom thickness measurement data, the practicability is high, the running condition of the bottom tuyere of the bottom oxygen blowing bottom powder injection converter can be intuitively and rapidly monitored, and the safe running of the bottom spray gun is ensured.
Drawings
FIG. 1 is a cross-sectional view of a measurement of the present invention;
FIG. 2 is a view showing the shape of the tuyere pit in the V-shape;
FIG. 3 is a view showing the shape of a W-shaped tuyere pit according to the present invention;
in the figure: a fixed thickness gauge 1 and a bottom spray gun 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments, and it is apparent that the described embodiments are a small part of the embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
An abnormal eating and loss early warning method for a bottom tuyere of a bottom blowing and bottom powder spraying converter comprises the following steps:
(1) A bottom spray gun of the bottom blowing oxygen bottom powder injection converter is put into the furnace bottom refractory material, and a spray gun opening is exposed to form an air opening;
(2) After tapping and deslagging of the converter are finished, measuring the thickness of refractory materials at each part of the bottom of the converter by adopting a fixed thickness gauge;
(3) Abnormal erosion occurs in the air port, pits are formed in the air port and the peripheral refractory material, the caliber L value and the depth H value of the pits are measured, and the air port erosion condition is represented according to the L value and the H value;
(4) And (5) making a forecasting method for abnormal erosion of the tuyere.
In the step (4), when H is more than 200mm, the system is forecasted to start.
After the forecasting system is started, L/H is less than 0.5, and the wind gap is abnormally eroded and red for early warning; yellow early warning is carried out in the range of 0.5< L/H <4 >; L/H is more than 4, the early warning is green, and the tuyere is safe.
Under the yellow early warning condition of the bottom tuyere, the tuyere image morphology is combined, the furnace bottom thickness measurement feedback pit is in a V shape or a W shape, and the comprehensive judgment is carried out after the dynamic regulation and control of the tuyere.
After the red early warning is sent, the tuyere is plugged in time.
In the step (2), every equidistant Deltax in the horizontal direction of the fixed thickness gauge can measure and output a vertical distance H value from the fixed thickness gauge to the furnace bottom. Taking the central axis of a certain bottom spray gun as a base point, and the vertical distance measured by the point is denoted as H 0; taking the central axis of a certain bottom spray gun as a base point, the vertical distance recorded leftwards in the horizontal direction is denoted as H m, and the vertical distance measured rightwards and recorded is denoted as H n; when (H n - Hn-1) is smaller than 20: 20 mm and the values of the subsequent adjacent continuous H n-1- Hn-2、Hn-2 - Hn-3、… 、Hn-9 - Hn-10 are smaller than 20: 20 mm, selecting the value of n at the moment; selecting m value by the same way;
The calculation formulas of L and H are as follows:
L =（m + n）·△x
H =（Hm + Hn）- 2H0。
The principle of the invention is as follows: in the blowing process, a mushroom head-shaped bottom air opening is formed at the outlet part of the bottom gun, and the bottom air opening is in direct contact with the high-temperature molten steel pool. Under normal conditions, the bottom spray gun is synchronous with the corrosion of the peripheral refractory, and pits do not appear or very gentle pits appear around the tuyere. Because the central tube of the bottom lance 2 blows oxygen, under the conditions of unstable process control and maintenance, mismatching of lance types and the like, the bottom tuyere can be abnormally melted and damaged, and the melting and damage is irreversible. After the tuyere is abnormally melted and damaged, the corrosion of the peripheral refractory material is aggravated under the coupling action of high-speed jet flow of gas such as bottom blowing and high temperature and carbon-oxygen reaction, and obvious pits are gradually formed in the bottom tuyere and the peripheral area over time. The obvious pit is an abnormal situation, but the caliber and depth of the pit can objectively erode the tuyere of the bottom of the reaction furnace, so that a basis is provided for judging whether the bottom spray gun can be safely used or not.
In practical application, the method comprises the following specific steps:
(1) After tapping and deslagging of the converter are finished, measuring the thickness of refractory materials at each part of the bottom of the converter by adopting a fixed thickness gauge.
(2) Every equidistant (Deltax) in the horizontal direction of the stationary thickness gauge will measure and output the vertical distance H from the stationary thickness gauge to the furnace bottom. The vertical distance measured at this point, which is based on the central axis of a bottom lance, is designated as H 0.
(3) The vertical distance recorded to the left in the horizontal direction with a certain bottom lance central axis as a base point is denoted as H m, and the vertical distance measured and recorded to the right is denoted as H n.
(4) And determining the values of m and n. When (H n - Hn-1) is less than 20: 20mm and the values of the subsequent adjacent consecutive H n-1- Hn-2、Hn-2 - Hn-3、… 、Hn-9 - Hn-10 are all less than 20: 20mm, the value of n at this time is selected. Similarly, the value of m is selected.
(5) L, H in the present invention is calculated as follows:
L =（m + n）·△x
H =（Hm + Hn）- 2H0
(6) Abnormal eating loss alarm
H is more than 200mm, and alarming is started;
L/H is less than 0.5, and red early warning is carried out;
L/H is more than 4, the early warning is green, and the tuyere is safe;
0.5< L/H <4 >, and yellow warning.
(7) Under the condition of yellow early warning of the bottom tuyere, the tuyere image morphology and the furnace bottom thickness measurement feedback pits are combined to form a V shape or a W shape, and the tuyere is comprehensively judged after dynamic regulation and control are implemented.
(8) After the red early warning is sent out (L/H is less than 0.5), the tuyere is preferably plugged in time, so that the steel leakage or the explosion accident of the furnace bottom element is avoided.
Claims (6)
1. The method for early warning of abnormal eating loss of the bottom tuyere of the bottom blowing and bottom powder spraying converter is characterized by comprising the following steps:
(1) A bottom spray gun of the bottom blowing oxygen bottom powder injection converter is put into the furnace bottom refractory material, and a spray gun opening is exposed to form an air opening;
(2) After tapping and deslagging of the converter are finished, measuring the thickness of refractory materials at each part of the bottom of the converter by adopting a fixed thickness gauge;
(3) Abnormal erosion occurs in the air port, pits are formed in the air port and the peripheral refractory material, the caliber L value and the depth H value of the pits are measured, and the air port erosion condition is represented according to the L value and the H value;
(4) And (5) making a forecasting method for abnormal erosion of the tuyere.
2. The method for early warning of abnormal eating loss of the bottom tuyere of the bottom blowing and bottom powder injection converter according to claim 1, which is characterized in that: in the step (4), when H is more than 200mm, the system is forecasted to start.
3. The method for early warning of abnormal eating loss of the bottom tuyere of the bottom blowing and bottom powder injection converter according to claim 2, which is characterized in that: after the forecasting system is started, L/H is less than 0.5, and the wind gap is abnormally eroded and red for early warning; yellow early warning is carried out in the range of 0.5< L/H <4 >; L/H is more than 4, the early warning is green, and the tuyere is safe.
4. The method for early warning of abnormal eating loss of the bottom tuyere of the bottom blowing and bottom powder injection converter according to claim 3, which is characterized in that: under the yellow early warning condition of the bottom tuyere, the tuyere image morphology is combined, the furnace bottom thickness measurement feedback pit is V-shaped or W-shaped, and the comprehensive judgment is carried out after dynamic regulation and control on the tuyere.
5. The method for early warning of abnormal eating loss of the bottom tuyere of the bottom blowing and bottom powder injection converter according to claim 3, which is characterized in that: after the red early warning is sent, the tuyere is plugged in time.
6. The method for early warning of abnormal eating loss of the bottom tuyere of the bottom blowing and bottom powder injection converter according to claim 1, which is characterized in that: in the step (2), every equidistant Deltax in the horizontal direction of the fixed thickness gauge can measure and output a vertical distance H value from the fixed thickness gauge to the furnace bottom. Taking the central axis of a certain bottom spray gun as a base point, and the vertical distance measured by the point is denoted as H 0; taking the central axis of a certain bottom spray gun as a base point, the vertical distance recorded leftwards in the horizontal direction is denoted as H m, and the vertical distance measured rightwards and recorded is denoted as H n; when (H n - Hn-1) is smaller than 20: 20 mm and the values of the subsequent adjacent continuous H n-1- Hn-2、Hn-2 - Hn-3、… 、Hn-9 - Hn-10 are smaller than 20: 20 mm, selecting the value of n at the moment; selecting m value by the same way;
The calculation formulas of L and H are as follows:
L =（m + n）·△x
H =（Hm + Hn）- 2H0。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410249842.4A CN118256670A (en) | 2024-03-05 | 2024-03-05 | Abnormal eating and loss early warning method for bottom tuyere of bottom blowing and bottom powder spraying converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410249842.4A CN118256670A (en) | 2024-03-05 | 2024-03-05 | Abnormal eating and loss early warning method for bottom tuyere of bottom blowing and bottom powder spraying converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118256670A true CN118256670A (en) | 2024-06-28 |
Family
ID=91612184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410249842.4A Pending CN118256670A (en) | 2024-03-05 | 2024-03-05 | Abnormal eating and loss early warning method for bottom tuyere of bottom blowing and bottom powder spraying converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118256670A (en) |
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2024
- 2024-03-05 CN CN202410249842.4A patent/CN118256670A/en active Pending
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