CN113462846B - Sublance carbon determination fault emergency treatment method - Google Patents

Sublance carbon determination fault emergency treatment method Download PDF

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CN113462846B
CN113462846B CN202110708687.4A CN202110708687A CN113462846B CN 113462846 B CN113462846 B CN 113462846B CN 202110708687 A CN202110708687 A CN 202110708687A CN 113462846 B CN113462846 B CN 113462846B
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sublance
carbon
molten steel
supply flow
carbon content
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CN113462846A (en
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邱在军
邓勇
廖彬
韩宝
李海波
兰海峰
吴亚男
黄传根
宋健
刘鑫磊
徐志亮
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Maanshan Iron and Steel Co Ltd
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    • 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
    • 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
    • Y02P10/25—Process efficiency

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a sublance carbon determination fault emergency treatment method, and belongs to the field of iron and steel smelting. The method comprises the following steps: s01, establishing a carbon content prediction equation in advance:[C]= A + B × (CO)%, wherein [ C × (CO)%)]The carbon content of the molten steel is shown, A and B are coefficients corresponding to the converter, and (CO)% is the peak value of the CO content of the converter gas after the carbon determination measurement of the sublance; s02, when the sublance carbon determination fault happens, obtaining the CO content peak value (CO) of the converter gas after the measurement 0 % and the peak value (CO) 0 % is substituted into the carbon content prediction equation to obtain the carbon content prediction value [ C ] of the molten steel 0 ](ii) a S03, predicting the value [ C ] according to the carbon content of the molten steel 0 ]And determining how to smelt the alloy subsequently. The method can greatly improve the accuracy and timeliness of the prediction of the carbon content of the molten steel when the sublance carbon determination fault occurs, ensure the correctness and reliability of subsequent judgment and operation of field staff, improve the emergency treatment efficiency after the sublance carbon determination fault occurs, and simultaneously ensure the production quality of steel.

Description

Sublance carbon determination fault emergency treatment method
Technical Field
The invention relates to the field of steel smelting, in particular to an emergency treatment method for carbon determination fault of a sublance.
Background
In the converter steelmaking process, the actual decarburization speed is 'slow at two ends and fast in the middle'. In the initial stage of blowing, the decarburization speed almost linearly increases with the blowing time; in the middle stage of the blowing, the decarburization speed almost depends only on the oxygen supply intensity; in the later stage of the blowing, when the content of carbon is reduced to a certain extent, the diffusion rate of carbon is reduced, and the oxidation rate of carbon is also sharply reduced to be similar to that in the initial stage of the blowing, but the oxidation rate depends on the concentration and diffusion rate of carbon and is proportional to the content of carbon. Generally, carbon determination is required when oxygen is supplied for about 85% in the middle and later stages of smelting.
When a TSC (thyristor switched capacitor) crystallization carbon determination fault of the sublance occurs in a converter equipped with the sublance, the content of main blown carbon cannot be measured, and further serious influence is caused on the production sequence and the production quality. At present, when the crystallization carbon determination of the sublance TSC fails, the following three treatment modes are generally adopted:
(1) the oxygen supply of the oxygen lance is stopped, and the sublance is measured again. However, re-measurement generally takes 2-3 minutes and the probability of not being measured is still large; in addition, the molten steel temperature is higher in the waiting process of the oxygen lifting lance in the later smelting period, the heat loss is larger, and the oxidability of the molten steel is strong to seriously corrode a refractory material of a furnace lining.
(2) And stopping oxygen supply of the oxygen supplying lance, and informing equipment personnel to go to sublance equipment to process faults on site. Since it takes at least 10 minutes for plant personnel to arrive at the site and time for post-processing to arrive, the production time node is greatly affected.
(3) The converter operator judges the carbon content by experience to determine how to smelt subsequently. However, since the sublance is used for carbon determination for a long time, the experience skills of converter operators for judging the carbon content are reduced and are uneven, and the judgment is extremely inaccurate. If the carbon content estimated value is low, namely the actual carbon content is high, the actual auxiliary blown oxygen content is low, the end point oxygen content of the molten steel is low, and finally the phosphorus content of the molten steel is high; if the carbon content estimated value is higher, namely the actual carbon content is lower, the actual auxiliary oxygen supply amount is too much, the final oxygen content of the molten steel is higher, and the molten steel is over-oxidized.
Disclosure of Invention
Technical problems to be solved by the invention
Aiming at the problems existing in the conventional emergency treatment method when the TSC (thyristor switched capacitor) crystallization carbon-fixing fault of the sublance occurs, the invention provides the sublance carbon-fixing fault emergency treatment method which can greatly improve the accuracy and timeliness of the prediction of the carbon content of molten steel when the sublance carbon-fixing fault occurs, ensure the accuracy and reliability of the subsequent judgment and operation of field staff, improve the emergency treatment efficiency after the sublance carbon-fixing fault occurs and ensure the production quality of steel.
Technical scheme
In order to solve the problems, the technical scheme provided by the invention is as follows:
a sublance carbon determination fault emergency treatment method comprises the following steps:
s01, pre-establishing a carbon content prediction equation: [C] = A + B × (CO)%, where [ C ] is the carbon content of molten steel, A and B are coefficients corresponding to the converter, and (CO)% is the peak value of the CO content of converter gas after sublance carbon determination measurement;
s02, when the sublance carbon determination fault occurs, obtaining the CO content peak value (CO) of the converter gas after the measurement 0 % and will peak value (CO) 0 % is substituted into the carbon content prediction equation to obtain the carbon content prediction value [ C ] of the molten steel 0 ]；
S03, predicting a value [ C ] according to the carbon content of the molten steel 0 ]And determining how to smelt subsequently.
Further, the method for obtaining the carbon content prediction equation comprises the following steps:
i, performing sublance carbon determination measurement on n-furnace smelting of a target converter, and sending a molten steel sample obtained by a sublance to a laboratory for detection to obtain the carbon content [ C ] of the molten steel 1 ]～[C n ]And monitoring the CO content peak (CO) of the converter gas measured by the sublance 1 ％～(CO) n Percent, wherein n is more than or equal to 20;
and ii, performing linear regression analysis on the data obtained in the step i to obtain the A and the B.
Further, in the step i, the sub-lance carbon determination is performed when the carbon content of the molten steel is 0.15 to 0.45%.
Further, for a 300 ton converter, n takes a value of 30, a =0.0833, and B =0.51.
Further, in order to improve the accuracy of the prediction of the carbon content [ C ] of the molten steel, the following operations are carried out in the smelting process of the converter:
(1) setting oxygen supply flow, lance position, bottom blowing gas supply flow and net height of a movable smoke hood of the OG system from a furnace mouth of the oxygen lance 1min before measurement by the sublance;
(2) keeping the lance position and the net height of the movable smoke hood of the OG system from the furnace mouth unchanged 0.5min before measuring by the sublance, reducing the oxygen supply flow of the oxygen lance to 55-56% of the oxygen supply flow of the oxygen lance in the step (1), and reducing the bottom blowing gas supply flow to 33-34% of the bottom blowing gas supply flow in the step (1);
(3) and (3) after the sublance measurement is finished, keeping the lance position and the net height of the movable gas hood of the OG system from the furnace mouth unchanged, and adjusting the oxygen supply flow of the oxygen lance to the oxygen supply flow of the oxygen lance in the step (1) and adjusting the bottom blowing gas supply flow to 166-167% of the bottom blowing gas supply flow in the step (1).
Further, in the step (1), the oxygen supply flow rate of the oxygen lance is 63000m for a 300 ton converter 3 The gun position is 1.8m, and the air flow of bottom blowing is 1188m 3 And h, the net height of the movable smoke hood of the OG system from the furnace mouth is 40cm.
Advantageous effects
(1) The invention relates to a sublance carbon-fixing fault emergency treatment method, which constructs a carbon content prediction equation according to the strong linear relation between the CO content peak value generated by the CO content of converter gas and the carbon content in molten steel after sublance measurement, and when the sublance carbon-fixing fault occurs, the CO content peak value (CO) of converter gas is used for carrying out the carbon-fixing fault treatment on the sublance 0 The% is substituted into the carbon content prediction equation, so that an accurate carbon content prediction value of the molten steel is obtained, the accuracy and the timeliness of the prediction of the carbon content of the molten steel when the sublance carbon determination fault occurs are greatly improved, the accuracy and the reliability of the subsequent judgment and operation of field staff are ensured through the emergency treatment method, the emergency treatment efficiency after the sublance carbon determination fault is generated is improved, and the production quality of steel is ensured;
(2) The sublance carbon determination fault emergency treatment method eliminates the influence of oxygen supply flow of an oxygen lance, lance position, bottom blowing gas supply flow and net height of a movable smoke hood of an OG system from a furnace mouth on the CO content in converter gas, thereby improving linear relation between the peak value of the CO content after TSC measurement of the converter gas sublance and the carbon content in molten steel, providing reliable molten steel carbon content for operators when TSC carbon determination fault of the sublance, ensuring smooth production, and simultaneously reducing the occurrence of low oxygen and high phosphorus at the end point and molten steel peroxidation when TSC carbon determination fault occurs in the sublance;
(3) The sublance carbon determination fault emergency treatment method can control the deviation between the carbon content predicted value in the molten steel and laboratory tests within 0.04% aiming at a converter of 300 tons, and the accuracy and the reliability are far higher than those of other existing emergency treatment means.
Drawings
FIG. 1 is a graph showing the change of CO content with time in the process of recovering the smelting gas of the converter.
Detailed Description
The following examples are put forth so as to provide those of ordinary skill in the art with a more complete, thorough, and complete understanding of the principles and techniques of the present invention, as well as the several details of its operation.
Examples
The embodiment provides a sublance carbon determination fault emergency processing method, which comprises the following steps:
s01, establishing a carbon content prediction equation in advance: [C] = A + B × (CO)%, where [ C ] represents the carbon content of molten steel, A and B represent coefficients corresponding to the converter, and (CO)% represents the CO content peak value of converter gas after carbon determination by sublance;
s02, when the sublance carbon determination fault occurs, obtaining the CO content peak value (CO) of the converter gas after the measurement 0 % and the peak value (CO) 0 % is substituted into the carbon content prediction equation to obtain the carbon content prediction value [ C ] of the molten steel 0 ]；
S03, predicting a value [ C ] according to the carbon content of the molten steel 0 ]And determining how to smelt subsequently.
When the TSC probe of the sublance is used for measuring in a converter equipped with the sublance, in order to improve the success rate of sublance measurement, the oxygen supply flow is generally adjusted downwards firstly during measurement, and then is adjusted upwards to the normal flow after the measurement is finished. As shown in FIG. 1, in the above process, the CO content in the converter gas is decreased and then increased as the oxygen flow rate is decreased and then decreased again as the carbon content of molten steel is decreased, and thus the CO content in the gas has a peak value after the sublance is fixed. The long-term tracking research on the spot of the inventor finds that the CO content peak value has a strong linear relation with the carbon content in the molten steel.
According to the sublance carbon determination fault emergency treatment method, a carbon content prediction equation is constructed by utilizing the strong linear relation between the CO content peak value and the carbon content in the molten steel. When the carbon determination fault of the sublance occurs, the CO content peak value (CO) of the converter gas is measured 0 The% is substituted into the carbon content prediction equation, so that an accurate molten steel carbon content prediction value is obtained, the accuracy and timeliness of prediction of the molten steel carbon content when the sublance carbon determination fault occurs are greatly improved, the accuracy and reliability of subsequent judgment and operation of field staff are ensured through the emergency treatment method, the emergency treatment efficiency after the sublance carbon determination fault is generated is improved, and meanwhile, the production quality of steel is ensured.
The carbon content prediction equation is obtained by adopting a linear regression method, and the specific method comprises the following steps:
aiming at the same converter, in the smelting production process, carrying out sublance carbon determination measurement on n-furnace smelting of a target converter, and sending a molten steel sample obtained by a sublance to a laboratory to detect and obtain the carbon content [ C ] of molten steel 1 ]～[C n ]And monitoring the CO content peak value (CO) of the converter gas measured by the sublance 1 ％～(CO) n In order to ensure the accuracy of the two constant values of A and B, the number n of smelting furnaces is more than 20; it will be appreciated that where accuracy is not a concern, the value of n may also be taken to be less than 20;
and ii, performing linear regression analysis on the data obtained in the step i to obtain the A and the B, thus obtaining the carbon content prediction equation.
Through further research by the inventor, the timing of carbon determination measurement of the sublance has certain influence on the accuracy of carbon determination. Further research shows that when the carbon content of the molten steel is in a range of 0.15-0.45%, the measured value closer to the real carbon content of the molten steel can be obtained by performing sublance carbon determination measurement, and oxygen supply is about 85% in the middle and later smelting stages. Therefore, in the scheme, the n furnace data obtained in the process of constructing the carbon content prediction equation are generated by selecting the carbon determination measurement when the carbon content of the molten steel is 0.15-0.45%, so that two numerical values A and B in the more accurate carbon content prediction equation are obtained. Based on the reasons, the carbon determination measurement is carried out when the carbon content of the molten steel is 0.15-0.45%, and the reliability of the emergency treatment method for the carbon determination fault of the sublance is higher after the carbon determination fault of the sublance occurs.
Based on the above method, for a 300 ton converter, n takes a value of 30, where a =0.0833 and B =0.51, the carbon content prediction equation is: [C] =0.0833+0.51 x (CO)%.
The inventor also finds that the CO content peak value generated after the sublance carbon determination measurement is particularly obviously influenced by oxygen lance oxygen supply flow, lance position, bottom blowing gas supply flow and net height between an OG system movable smoke hood and a furnace mouth in a field long-term tracking research, and if the CO content peak value is not accurately acquired, the predicted deviation of the carbon content of molten steel may be increased, so that the prediction accuracy and reliability are reduced. Therefore, in order to improve the accuracy of the prediction of the carbon content [ C ] of the molten steel, the following operations are performed in the converter smelting process:
(1) setting oxygen supply flow, lance position, bottom blowing gas supply flow and net height of a movable smoke hood of the OG system from a furnace mouth of the oxygen lance 1min before measurement by the sublance;
(2) keeping the lance position and the net height of the movable smoke hood of the OG system from the furnace mouth unchanged 0.5min before measuring by the sublance, reducing the oxygen supply flow of the oxygen lance to 55-56% of the oxygen supply flow of the oxygen lance in the step (1), and reducing the bottom blowing gas supply flow to 33-34% of the bottom blowing gas supply flow in the step (1);
(3) and (3) after the sublance measurement is finished, keeping the lance position and the net height of the movable gas hood of the OG system from the furnace mouth unchanged, and adjusting the oxygen supply flow of the oxygen lance to the oxygen supply flow of the oxygen lance in the step (1) and adjusting the bottom blowing gas supply flow to 166-167% of the bottom blowing gas supply flow in the step (1).
The inventor researches and discovers that once the sublance carbon determination fault occurs after the operation is implemented in the converter smelting process, the accuracy and the reliability of the obtained CO content peak value are high, and the predicted value of the carbon content of the molten steel obtained by substituting the carbon content prediction equation is accurate and reliable.
The following is a follow-up test conducted on the same 300-ton converter of the company. The following operation steps are executed in the converter smelting process:
(1) setting oxygen supply flow of the oxygen lance to be 63000m 1min before measuring TSC of the sublance 3 The gun position is 1.8m, and the air flow of bottom blowing is 1188m 3 H, the net height between the movable smoke hood of the OG system and the furnace mouth is 40cm;
(2) the TSC of the sublance is started to be measured 0.5min before the TSC of the sublance is measured, and the oxygen supply flow of the oxygen lance is reduced to 35000m 3 The position of the gun is 1.8m, and the air flow of bottom blowing is reduced to 396m 3 H, the net height between the movable smoke hood of the OG system and the furnace mouth is 40cm;
(3) after the sublance measurement is finished, the oxygen supply flow of the oxygen lance is recovered to 63000m 3 H, the gun position is 1.8m, the air flow of bottom blowing is adjusted up to 1980m 3 And h, the net height of the movable smoke hood of the OG system from the furnace mouth is 40cm.
The carbon content prediction equation is: [C] =0.0833+0.51 x (CO)%. After the carbon determination fault of molten steel occurs, the carbon content of the molten steel is shown in the following table:
serial number Peak value of CO content [C]Prediction value [C]Sample feeding detection value Difference between predicted value and detected value
1 61.2％ 0.40％ 0.42％ 0.02％
2 66.3％ 0.42％ 0.45％ 0.03％
3 39.7％ 0.29％ 0.26％ 0.03％
4 20.2％ 0.19％ 0.17％ 0.02％
According to the results in the table, after the sublance carbon-fixing fault occurs, the sublance carbon-fixing fault emergency treatment method can control the deviation between the predicted value of the carbon content in the molten steel and laboratory tests within 0.04%, has accurate and reliable guiding significance for the subsequent operation of field workers, and ensures the timeliness of emergency treatment after the sublance carbon-fixing fault occurs.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (4)

1. A sublance carbon determination fault emergency treatment method is characterized by comprising the following steps:
s01, establishing a carbon content prediction equation in advance: [C] = A + B × (CO)%, where [ C ] represents the carbon content of molten steel, A and B represent coefficients corresponding to the converter, and (CO)% represents the CO content peak value of converter gas after carbon determination by sublance;
s02, when the sublance carbon determination fault occurs, obtaining the CO content peak value (CO) of the converter gas after the measurement 0 % and will peak value (CO) 0 % is substituted into the carbon content prediction equation to obtain the carbon content prediction value [ C ] of the molten steel 0 ]；
S03, predicting the value [ C ] according to the carbon content of the molten steel 0 ]Determining how to smelt subsequently;
the method for obtaining the carbon content prediction equation comprises the following steps:
i, performing sublance carbon determination measurement on n-furnace smelting of a target converter, and sending a molten steel sample obtained by a sublance to a laboratory for detection to obtain the carbon content [ C ] of the molten steel 1 ]～[C n ]And monitoring the CO content peak (CO) of the converter gas measured by the sublance 1 %～(CO) n Percent, wherein n is more than or equal to 20, and the carbon determination measurement of the auxiliary lance is carried out when the carbon content of the molten steel is 0.15-0.45%;
and ii, carrying out linear regression analysis on the data obtained in the step i to obtain the A and the B.
2. The sublance carbon determination fault emergency treatment method according to claim 1, wherein for a 300 ton converter, n takes a value of 30, wherein a =0.0833 and wherein B =0.51.
3. The sub-lance carbon determination fault emergency treatment method according to claim 1 or 2, characterized in that, in order to improve the accuracy of the prediction of the carbon content [ C ] of molten steel, the following operations are performed in the converter smelting process:
(1) setting oxygen supply flow, lance position, bottom blowing gas supply flow and net height of a movable smoke hood of the OG system from a furnace mouth of the oxygen lance 1min before measurement of the sublance;
(2) keeping the lance position and the net height of the movable smoke hood of the OG system from the furnace mouth unchanged 0.5min before measuring by the sublance, reducing the oxygen supply flow of the oxygen lance to 55-56% of the oxygen supply flow of the oxygen lance in the step (1), and reducing the bottom blowing gas supply flow to 33-34% of the bottom blowing gas supply flow in the step (1);
(3) and (3) after the sublance measurement is finished, keeping the lance position and the net height of the movable gas hood of the OG system from the furnace mouth unchanged, and adjusting the oxygen supply flow of the oxygen lance to the oxygen supply flow of the oxygen lance in the step (1) and adjusting the bottom blowing gas supply flow to 166-167% of the bottom blowing gas supply flow in the step (1).
4. The sub-lance carbon determination fault emergency treatment method according to claim 3, wherein in the step (1), the oxygen lance oxygen supply flow is 63000m plantation/h, the lance position is 1.8m, the bottom blowing gas supply flow is 1188m plantation/h, and the clear height from the movable smoke hood of the OG system to the furnace mouth is 40cm for the 300-ton converter.
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