CN110628981A - Solidification experience method for defining splashing in converter blowing period - Google Patents
Solidification experience method for defining splashing in converter blowing period Download PDFInfo
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- CN110628981A CN110628981A CN201910916514.4A CN201910916514A CN110628981A CN 110628981 A CN110628981 A CN 110628981A CN 201910916514 A CN201910916514 A CN 201910916514A CN 110628981 A CN110628981 A CN 110628981A
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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
- C21C5/30—Regulating or controlling the blowing
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Abstract
The invention relates to the field of converter blowing, and discloses a solidification experience method for defining splashing in a converter blowing period, which comprises the following steps: collecting gas concentration data in converter blowing records which do not splash in the process of a plurality of furnaces to form a gas concentration minimum curve, obtaining a gas concentration real-time change curve in the actual steelmaking process, prompting that splash risks exist when the gas concentration real-time change curve exceeds the gas concentration minimum curve at a certain blowing time point, timely taking measures for correspondingly adjusting the gun position, and removing an alarm after the gas concentration real-time change curve returns to the lower part of the gas concentration minimum curve. The solidification experience method for defining the splashing in the converter blowing period enables a steelmaking operator to predict the impending splashing of the converter in time, and avoids the splashing problem of the converter by adjusting the lance position of an oxygen lance of the converter in time.
Description
Technical Field
The invention relates to the field of converter blowing, in particular to a solidification experience method for defining splashing in a converter blowing period.
Background
The problem of "splashing" can occur in the production process of the converter for various reasons. The time period of the splash occurrence is divided into early splash, middle splash and later splash.
Wherein, the early stage of splashing is mainly caused by concentrated feeding, relatively low temperature in a molten pool, bad slag melting condition or high silicon content in molten iron; the later stage 'splash' is mainly caused by improper control of the gun position in the operation process, the pollution caused by 'splash' in the early stage and the later stage is relatively small, and the 'splash' problem can be avoided by adjusting the operation mode.
However, the splashing appearing in the middle stage mainly shows that the carbon-oxygen reaction is severe, the temperature rise in the furnace is faster, iron oxide is gathered in the slag, liquid metal is sprayed out in the splashing process, the concentration of the formed overflow smoke is high, the pressure is large, the existing secondary dust removal facility is incapable of effectively recovering, and finally roof red dust for a long time is formed.
Disclosure of Invention
The invention aims to provide a solidification experience method for defining splashing in the converter blowing period aiming at the defects of the technology, so that a steelmaking operator can predict the impending splashing of the converter in time and avoid the splashing problem of the converter by adjusting the lance position of an oxygen lance of the converter in time.
In order to achieve the above purpose, the present invention provides a solidification experience method for defining the occurrence of splashing in the blowing period of a converter, which comprises the following steps:
A) collecting gas concentration data in converter converting records which do not splash in the converting process of a plurality of furnaces, and taking the minimum value of the gas concentration at each time point according to converting time points to form a gas concentration minimum value curve under the normal converting condition;
B) in the actual steelmaking process, acquiring gas concentration data in the converter in real time to form a gas concentration real-time change curve, and comparing the gas concentration real-time change curve with the gas concentration minimum curve under the normal converting condition acquired in the step A) according to converting time points;
C) when the real-time change curve of the gas concentration exceeds the minimum curve of the gas concentration at a certain converting time point, the real-time change curve of the gas concentration is crossed with the minimum curve of the gas concentration, so that the splashing risk is prompted, and measures for adjusting the gun position correspondingly are taken in time;
D) after the measure of correspondingly adjusting the gun position is taken, the alarm is released after the real-time change curve of the gas concentration returns to the lower part of the minimum curve of the gas concentration.
Preferably, after one actual steelmaking is completed, if the actual steelmaking does not splash, the gas concentration data in the current converting process is imported into the step A), the data is corrected, a new gas concentration minimum value curve is formed, and the accuracy is higher.
Preferably, after 2-4 minutes from the beginning of converting, increasing the minimum value of the gas concentration at each time point obtained in the step A) by 0.04-0.06 upwards to form an early warning value of the gas concentration at each time point, further forming a gas concentration early warning curve under a normal converting condition, and using the gas concentration early warning curve synchronously with the gas concentration minimum value curve.
Preferably, in the step a), furnace mouth micro-differential pressure data in a converter blowing record without splashing in the blowing process are collected at the same time, according to the blowing time points, the maximum value of the furnace mouth micro-differential pressure at each time point is taken to form a furnace mouth micro-differential pressure maximum value curve under the normal blowing condition, in the actual steel-making process, furnace mouth micro-differential pressure data in the converter are obtained in real time to form a furnace mouth micro-differential pressure real-time change curve, the furnace mouth micro-differential pressure real-time change curve and the furnace mouth micro-differential pressure maximum value curve under the normal blowing condition obtained in the step a) are compared according to the blowing time points, when the furnace mouth micro-differential pressure real-time change curve exceeds the furnace mouth micro-differential pressure maximum value curve at a certain blowing time point, the furnace mouth micro-differential pressure real-time change curve and the furnace mouth micro-differential pressure maximum value curve are crossed, the splashing risk is prompted, and.
The principle of the solidification experimental method for defining splashing in the converter blowing period is as follows:
the oxygen blowing amount of the converter is relatively stable in the blowing process. At this time, oxygen mainly and respectively reacts with iron element in the molten iron to form iron oxide smoke, and reacts with carbon element in the molten iron to form carbon monoxide gas. Before the iron oxide smoke dust and carbon monoxide gas enter the primary smoke dust removal system, the pressure formed at the converter mouth of the converter can be timely collected by a pressure monitoring system arranged at the inlet of the movable smoke hood to form a furnace mouth micro-differential pressure change curve, and a secondary throat in the primary smoke washing system can adjust the opening of the secondary throat according to the furnace mouth micro-differential pressure change curve so as to adapt to the requirements of smoke pressure and flow under the working condition at that time.
After the synchronous analysis of the relevant curve of the number of times of the furnace with the splashing is carried out, the fact that the carbon-oxygen reaction is more violent when the temperature in the converter is further increased when the blowing enters the middle period is found, and the concentration of the carbon monoxide generated in the converter is higher and basically between 60% and 45%. And then, the pressure data fed back by the micro-differential pressure at the furnace mouth is reduced on the basis of the earlier stage, and the gas concentration is also reduced. Obviously, there is a certain difference from normal converting, and the slight differential pressure at the furnace mouth is reduced, which shows that the amount of smoke (iron oxide) is relatively reduced; the decrease in the gas concentration indicates that the carbon-oxygen reaction is reduced, while the converter oxygen blowing is unchanged. This only means that part of the iron oxide enters the slag layer and accumulates, and at this time, the oxygen also reacts with the iron oxide in the slag layer to form iron sesquioxide soot. The sudden superposition of the flue gas volume can lead the pressure data fed back by the micro differential pressure at the furnace mouth to be suddenly increased, and finally form the 'splashing' of the converter.
Compared with the prior art, the invention has the following advantages:
1. the applicability is strong, and the method is suitable for the advanced prediction prevention and control of the splashing problem in the production process of the converter;
2. the method is simple, only the data of the 'gas concentration' curve formed in the normal steelmaking process needs to be collected and analyzed to form a minimum gas concentration curve, the minimum gas concentration curve is compared with an actual relevant curve formed in the actual steelmaking process, when the relevant curve formed in the actual steelmaking process deviates from the lower limit of the minimum gas concentration curve, an early warning signal appears, and a steelmaking operator prompts to take corresponding measures for adjusting the gun position according to the early warning signal, so that the 'splashing' problem is avoided;
3. more adjusting time is reserved for a steelmaking operator by setting a coal gas concentration early warning curve;
4. the accuracy of early warning is improved by combining a furnace mouth micro-differential pressure maximum value curve;
5. importing data formed in each normal steelmaking process into the step A), correcting the data to form a new minimum gas concentration curve, and achieving higher accuracy;
6. the method does not need additional equipment investment and has good economical efficiency.
Drawings
FIG. 1 is a schematic representation of the minimum gas concentration curve under normal blowing conditions in the empirical method of solidification for defining the occurrence of slopping during the converter blowing period of the present invention.
Detailed Description
The following specific examples further illustrate the invention in detail.
A solidification experience method for defining the occurrence of splashing in the blowing period of a converter comprises the following steps:
A) collecting 1000 converter converting data, screening out 208 converter converting records that the furnace does not splash, and taking the minimum value of the gas concentration at each time point according to converting time points, wherein the minimum value is shown in the following table:
forming a gas concentration minimum curve under normal converting conditions as shown in figure 1;
B) in the actual steelmaking process, acquiring gas concentration data in the converter in real time to form a gas concentration real-time change curve, and comparing the gas concentration real-time change curve with the gas concentration minimum curve under the normal converting condition acquired in the step A) according to converting time points;
C) when the real-time change curve of the gas concentration exceeds the minimum curve of the gas concentration at a certain converting time point, the real-time change curve of the gas concentration is crossed with the minimum curve of the gas concentration, so that the splashing risk is prompted, and measures for adjusting the gun position correspondingly are taken in time;
D) after the measure of correspondingly adjusting the gun position is taken, the alarm is released after the real-time change curve of the gas concentration returns to the lower part of the minimum curve of the gas concentration.
In addition, in the step A), furnace mouth micro-differential pressure data in a converter blowing record without splashing in the blowing process are collected simultaneously, the maximum value of the furnace mouth micro-differential pressure at each time point is taken according to the blowing time points to form a furnace mouth micro-differential pressure maximum value curve under the normal blowing condition, in the actual steel-making process, furnace mouth micro-differential pressure data in the converter are obtained in real time to form a furnace mouth micro-differential pressure real-time change curve, the furnace mouth micro-differential pressure real-time change curve and the furnace mouth micro-differential pressure maximum value curve are compared according to the blowing time points and the furnace mouth micro-differential pressure maximum value curve under the normal blowing condition obtained in the step A), when the furnace mouth micro-differential pressure real-time change curve exceeds the furnace mouth micro-differential pressure maximum value curve at a certain blowing time point, the furnace mouth micro-differential pressure real-time change curve and the furnace mouth micro-differential pressure maximum value curve are.
In this embodiment, after one actual steelmaking is completed, if the actual steelmaking does not splash, the gas concentration data in the current converting process is imported into step a), and a new gas concentration minimum curve is formed.
In another embodiment, after blowing starts for 3 minutes, the minimum value of the gas concentration at each time point obtained in the step A) is increased by 0.05 upwards to form an early warning value of the gas concentration at each time point, so that a gas concentration early warning curve under a normal blowing condition is formed and is used synchronously with the gas concentration minimum value curve.
The solidification experience method for defining the splashing in the converter blowing period has strong applicability, and is suitable for advanced prediction prevention and control of the splashing problem in the converter production process; the method is simple, only the data of the gas concentration curve formed in the normal steelmaking process needs to be collected and analyzed to form a gas concentration minimum value curve, the gas concentration minimum value curve is compared with an actual relevant curve formed in the actual steelmaking process, when the relevant curve formed in the actual steelmaking process deviates from the lower limit of the gas concentration minimum value curve, an early warning signal appears, and a steelmaking operator prompts to take corresponding measures for adjusting the gun position according to the early warning signal, so that the splashing problem is avoided; in addition, by setting a coal gas concentration early warning curve, more adjusting time is reserved for a steelmaking operator, and the early warning accuracy is improved by combining a furnace mouth micro-differential pressure maximum curve; and the data formed in the normal steelmaking process each time is led into the step A), the data is corrected to form a new coal gas concentration minimum curve, and the accuracy is higher; the method does not need additional equipment investment and has good economical efficiency.
Claims (4)
1. A solidification experience method for defining the occurrence of splashing during the blowing period of a converter is characterized in that: the method comprises the following steps:
A) collecting gas concentration data in converter converting records which do not splash in the converting process of a plurality of furnaces, and taking the minimum value of the gas concentration at each time point according to converting time points to form a gas concentration minimum value curve under the normal converting condition;
B) in the actual steelmaking process, acquiring gas concentration data in the converter in real time to form a gas concentration real-time change curve, and comparing the gas concentration real-time change curve with the gas concentration minimum curve under the normal converting condition acquired in the step A) according to converting time points;
C) when the real-time change curve of the gas concentration exceeds the minimum curve of the gas concentration at a certain converting time point, the real-time change curve of the gas concentration is crossed with the minimum curve of the gas concentration, so that the splashing risk is prompted, and measures for adjusting the gun position correspondingly are taken in time;
D) after the measure of correspondingly adjusting the gun position is taken, the alarm is released after the real-time change curve of the gas concentration returns to the lower part of the minimum curve of the gas concentration.
2. The empirical method for solidification with limited occurrence of slopping during the converter blowing period as claimed in claim 1, wherein: and (C) after one actual steelmaking is finished, if the actual steelmaking does not splash, importing the gas concentration data in the current converting process into the step A) to form a new gas concentration minimum curve.
3. The empirical method for solidification with limited occurrence of slopping during the converter blowing period as claimed in claim 1, wherein: after 2-4 minutes from the beginning of converting, increasing the minimum value of the gas concentration at each time point obtained in the step A) by 0.04-0.06 upwards to form an early warning value of the gas concentration at each time point, further forming a gas concentration early warning curve under a normal converting condition, and using the gas concentration early warning curve synchronously with the minimum value of the gas concentration curve.
4. The empirical method for solidification with limited occurrence of slopping during the converter blowing period as claimed in claim 1, wherein: in the step A), furnace mouth micro-differential pressure data in a converter converting record without splashing in the converting process are collected simultaneously, the maximum value of the furnace mouth micro-differential pressure at each time point is taken according to converting time points to form a furnace mouth micro-differential pressure maximum value curve under a normal converting condition, in the actual steel-making process, furnace mouth micro-differential pressure data in a converter are obtained in real time to form a furnace mouth micro-differential pressure real-time change curve, the furnace mouth micro-differential pressure real-time change curve and the furnace mouth micro-differential pressure maximum value curve are compared according to the converting time points and the furnace mouth micro-differential pressure maximum value curve under the normal converting condition obtained in the step A), when the furnace mouth micro-differential pressure real-time change curve exceeds the furnace mouth micro-differential pressure maximum value curve at one converting time point, the furnace mouth micro-differential pressure real-time change curve and the furnace mouth micro-differential pressure maximum value curve are crossed, the splashing.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113046511A (en) * | 2021-03-15 | 2021-06-29 | 包头钢铁（集团）有限责任公司 | Method for stably controlling splashing and drying of converter |
| CN113435037A (en) * | 2021-06-25 | 2021-09-24 | 马鞍山钢铁股份有限公司 | Method for judging slag pouring time in early stage of cast residue smelting of 300t converter |
| CN113564296A (en) * | 2021-06-25 | 2021-10-29 | 武汉钢铁有限公司 | Splashing early warning method and system for steel converter and industrial control equipment |
| CN114525375A (en) * | 2022-03-25 | 2022-05-24 | 山东钢铁股份有限公司 | Method and system for controlling abnormal furnace conditions of converter |
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| JPS6017011A (en) * | 1983-07-07 | 1985-01-28 | Daido Steel Co Ltd | Vessel for refining by blowing of gas |
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| CN102363825A (en) * | 2011-11-11 | 2012-02-29 | 田陆 | Method, device and system for controlling furnace conditions of convertor steelmaking |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113046511A (en) * | 2021-03-15 | 2021-06-29 | 包头钢铁（集团）有限责任公司 | Method for stably controlling splashing and drying of converter |
| CN113435037A (en) * | 2021-06-25 | 2021-09-24 | 马鞍山钢铁股份有限公司 | Method for judging slag pouring time in early stage of cast residue smelting of 300t converter |
| CN113564296A (en) * | 2021-06-25 | 2021-10-29 | 武汉钢铁有限公司 | Splashing early warning method and system for steel converter and industrial control equipment |
| CN113435037B (en) * | 2021-06-25 | 2022-08-26 | 马鞍山钢铁股份有限公司 | Method for judging slag pouring time in early stage of cast residue smelting of 300t converter |
| CN113564296B (en) * | 2021-06-25 | 2023-02-28 | 武汉钢铁有限公司 | Splashing early warning method and system for steel converter and industrial control equipment |
| CN114525375A (en) * | 2022-03-25 | 2022-05-24 | 山东钢铁股份有限公司 | Method and system for controlling abnormal furnace conditions of converter |
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