CN116622929A - Method for automatically controlling opening degree of two-venturi throat of converter - Google Patents
Method for automatically controlling opening degree of two-venturi throat of converter Download PDFInfo
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- CN116622929A CN116622929A CN202310753575.XA CN202310753575A CN116622929A CN 116622929 A CN116622929 A CN 116622929A CN 202310753575 A CN202310753575 A CN 202310753575A CN 116622929 A CN116622929 A CN 116622929A
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- converter
- opening
- value
- initial value
- throat
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000002893 slag Substances 0.000 claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 35
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 239000003546 flue gas Substances 0.000 claims abstract description 16
- 239000000779 smoke Substances 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 34
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 17
- 239000001569 carbon dioxide Substances 0.000 claims description 17
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 230000008016 vaporization Effects 0.000 claims description 4
- 238000009834 vaporization Methods 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 abstract description 16
- 230000005236 sound signal Effects 0.000 abstract description 9
- 238000011084 recovery Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 238000009628 steelmaking Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 206010013023 diphtheria Diseases 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static 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
- C21C5/30—Regulating or controlling the blowing
-
- 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
Landscapes
- 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 relates to a method for automatically controlling the opening degree of a converter secondary throat, which is characterized in that in the converter blowing process, when the converter is in a charging state, when the converter blows to a slag point, after the converter blows to the slag point, before the converter sublance process is tested, when the temperature of molten steel is close to a smelting end point, a flue gas analyzer, a flame machine vision device and an audio signal acquisition device are used for acquiring the gas content of top gas, the change of the light intensity of the converter mouth or the light intensity of the lower edge of the converter mouth and the data information of a converter blowing sonar slag measurement value, and the acquired data information is transmitted to a PLC/DCS system, so that the opening degree of the converter secondary throat is automatically controlled in the converter blowing process when the converter is in the charging state. The invention has the advantages that: no manual intervention is needed, the smoke overflow is reduced, the gas recovery rate is improved, and the production safety is maintained.
Description
Technical Field
The invention relates to the technical field of converter gas recovery, in particular to a method for automatically controlling the opening degree of a two-venturi throat of a converter.
Background
In converter steelmaking, the control of the flue II throat is very important, and the following conditions can occur if the control is not good: the recovery rate of coal gas is affected, and negative energy steelmaking carbon emission is affected; smoke dust is easy to overflow, and environmental protection is affected; the frame and platform equipment of the flame firing factory are easy to be caused, and the crisis production is safe.
The prior method for controlling the diphtheria comprises the following steps:
1. manual fire observation is manually controlled, the excessive smoke and fire are observed through human eyes, and the opening of the throat of the second language is manually adjusted.
2. The method is characterized in that the pressure taking port is arranged on the inner side of the smoke hood, the environment is bad, and the pressure taking port is often blocked by hot smoke dust, steel slag and splashes, so that the pressure taking port cannot be normally used.
3. According to the static mode adjusting method, a fixed opening degree is set for a fixed time according to big data; publication number is CN107630120B, which discloses a method for adjusting the two venturi throat of a converter, and the disclosure is as follows:
1) During the process of adding iron and scrap steel, the opening of the throat of the second grade is controlled to be 40-50 percent;
2) In the oxidation period of the silicomanganese before the oxygen blowing amount is 20 percent, the opening of the RD valve is controlled to be 50 to 60 percent;
3) The oxygen blowing amount is 20 to 75 percent, and the opening degree of the RD valve is controlled to be more than 90 percent in the carbon oxygen violent oxidation period;
4) After the oxygen blowing amount is 75%, controlling the opening of the RD valve to be 65% -75%;
5) When the sublance process test starts, controlling the opening of the RD valve to be 50% -60%;
6) After oxygen blowing is finished, controlling the opening of the RD valve to be 40% -50%;
the disadvantage is that the regulation method is to statically control the two-character laryngeal opening.
4. The automatic mode adjusting method has the following publication number: CN105154615B discloses a "device and method for automatically adjusting the throat of converter two-venturi, which breaks through the micro-differential pressure control mode of the traditional pressure sensor of the throat, and adds a gas analyzer sensor, an oxygen gun position sensor and an oxygen regulating valve position sensor which are respectively arranged on the side surfaces of the flue gas pipelines of the fan and the three-way valve, and uses signals of carbon monoxide content, oxygen content and oxygen gun position as marks, and controls the throat hydraulic station through a PLC, when all detected signals meet the condition requirements, the weight moves downwards to a specified position, and when any one of the detected signals does not meet the condition, the weight moves upwards and returns to the initial position, thereby realizing the automatic control and adjustment of the throat of converter two-venturi; the gas content is utilized to dynamically control the two-venturi throat, and the disadvantage is that the variable is single.
Disclosure of Invention
The invention aims to provide a method for automatically controlling the opening of a converter II throat, which is used for automatically controlling the opening of the converter II throat through a plurality of variables of a charging state, the change of the gas content of the top gas of the converter, the change of the light intensity of the converter mouth or the light intensity of the lower edge of the converter mouth and the slag measuring value of a blowing sonar when the converter starts blowing, so that the overflow of smoke dust during steelmaking is reduced, the gas recovery rate is improved, and the production safety is maintained.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
the method for automatically controlling the opening of the second venturi throat of the converter is realized based on a PLC/DCS system, takes an empirical value before starting converting as an initial value of the opening value of the second venturi throat of the converter, and specifically comprises the following steps:
1) When the interior of the converter is in a charging state, the opening of the converter II throat is set as follows: increasing the opening degree I on the basis of the initial value, and returning to the initial value after maintaining the set time I;
2) When the converter blows to a slag point, the sum of the carbon monoxide concentration and the carbon dioxide concentration of the top gas is larger than a first set value, or the carbon dioxide concentration of the top gas is larger than a second set value, and the opening of a throat of the converter II is set as follows: increasing the opening II on the basis of the initial value, maintaining the setting time II, and returning to the initial value;
3) When the converter blows to a slag point, the method comprises the following steps:
s1, setting the opening of a converter II throat as: increasing the opening III on the basis of the initial value, and returning to the initial value after the light intensity value reaching the converter mouth is restored to the set threshold value;
s2, when the light intensity value of the lower edge of the converter mouth is larger than a second set threshold value, setting the opening of the converter II throat to be: increasing the opening fourth on the basis of the initial value, and returning the initial value after the light intensity value reaching the lower edge of the converter mouth is maintained to be restored to the set threshold value II;
4) When the converter blows to a slag point and the sonar slag measurement value falls in the dry return area, the opening of the second venturi throat of the converter is set as follows: reducing the opening five on the basis of the initial value, and returning to the initial value after the sonar residue detection value is separated from the dry return region;
5) Before the converter sublance process test, if the sum of the carbon monoxide concentration and the carbon dioxide concentration of the top gas is detected to suddenly drop, and the sonar slag detection value falls in a splash zone, setting the opening of the converter II throat to be: increasing the opening by six on the basis of the initial value, and returning to the initial value when the sonar slag measurement value is separated from the splashing region or when the slope of the sum of the carbon monoxide concentration and the carbon dioxide concentration of the top gas is greater than zero;
6) When the temperature of the molten steel approaches to the smelting end point, the light intensity value of the furnace mouth becomes strong, and the opening of the second venturi throat of the converter is restored to the initial value.
The converter sonar slag measurement value is the sound intensity value of fixed-frequency sound.
The carbon monoxide concentration of the top gas and the carbon dioxide concentration of the top gas are detected by a flue gas analyzer, and the flue gas analyzer is arranged at the tail end of the rising section of the vaporization cooling flue of the converter waste heat boiler; the light intensity value of the converter mouth or the strong light value of the lower edge of the converter mouth is detected by a flame machine vision device which is arranged right opposite to the converter fire door; the sonar slag measurement value is detected through a flame machine vision device, and the flame machine vision device is arranged on the position, opposite to the furnace mouth, of the trunnion side wall of the converter.
The flame machine vision device comprises a camera, the flame machine vision device comprises a sound sensor, and the smoke analyzer, the flame machine vision device and the flame machine vision device are all connected with the PLC/DCS system.
Compared with the prior art, the invention has the beneficial effects that:
the flue gas analyzer, the flame machine vision device and the audio signal acquisition device are used for acquiring the gas content of the top gas, the light intensity of the converter mouth or the light intensity change of the lower edge of the converter mouth and the data information of the converter blowing sonar slag measurement value, and transmitting the acquired data information to the PLC/DCS system, so that the opening degree of the converter secondary venturi mouth is automatically controlled in the converter blowing process when the converter is in a charging state, the gas recovery rate is realized, and the production safety is maintained.
Drawings
FIG. 1 is a schematic diagram of a method for automatically controlling the opening degree of a two-venturi throat of a converter.
Fig. 2 is a test curve of a converting process in converter steelmaking.
Fig. 3 is a schematic diagram of the control principle of the two venturi laryngeal opening.
In the figure: 1-flame machine vision device 2-audio signal collection device 3-flue gas analyzer 4-converter exhaust-heat boiler vaporization cooling flue.
Detailed Description
The present invention will be described in detail below with reference to the drawings of the specification, but it should be noted that the practice of the present invention is not limited to the following embodiments.
The following examples are given by way of illustration of detailed embodiments and specific procedures based on the technical scheme of the present invention, but the scope of the present invention is not limited to the following examples. The methods used in the examples described below are conventional methods unless otherwise specified.
[ example 1 ]
The main cause of the overflow of the flue gas during the converter steelmaking blowing is as follows:
1. when the converter is in a charging state, dust overflows;
2. the flue gas overflows when molten steel splashes;
3. the flue gas overflows when carbon monoxide or carbon dioxide of top gas generated during converting suddenly changes;
for the three reasons, acquiring data information of gas content change of top gas, light intensity of a converter mouth or light intensity of a lower edge of the converter mouth, a converter sonar slag measurement value (the converter sonar slag measurement value is a sound intensity value of fixed frequency sound) through a flue gas analyzer, a flame machine vision device and an audio signal acquisition device, transmitting the acquired data information to a PLC/DCS (programmable logic controller/distributed control system), and automatically controlling opening of a converter secondary throat in the converter blowing process when the converter is in a charging state, wherein the method is shown in fig. 1, and the carbon monoxide concentration of the top gas and the carbon dioxide concentration of the top gas are detected through a flue gas analyzer 3, wherein the flue gas analyzer 3 is arranged in front of a tail end descending section of an ascending section of a vaporization cooling flue 4 of a converter waste heat boiler; when molten steel is splashed, strong light is generated at the lower edge of the converter mouth, the light intensity value of the converter mouth or the strong light value of the lower edge of the converter mouth is detected by a flame machine vision device, and the flame machine vision device is arranged at the position, which is 20 meters right opposite to a fire door of the converter, and the camera can observe the flame of the converter mouth when the converter is steelmaking; the sonar slag measurement value is detected through an audio signal acquisition device, and the audio signal acquisition device is arranged on the position, opposite to the gap between the furnace mouth and the smoke hood, of the trunnion side wall of the converter; the flame machine vision device comprises a camera, the camera is used for detecting a furnace mouth area and a furnace mouth lower edge area, detecting whether steel slag overflows from the furnace mouth lower edge or not, the audio signal acquisition device comprises a sound sensor and an audio transducer, the sound sensor converts an acquisition signal into a 4-20mA signal through the audio transducer, the sound sensor of the audio signal acquisition device is used for detecting a sonar slag measurement value, and the smoke analyzer, the flame machine vision device and the audio signal acquisition device are all connected with the PLC/DCS system.
Referring to FIG. 2, FIG. 3, a shows a furnace mouth light intensity detection curve, b shows a sonar curve, c shows a curve of the sum of carbon monoxide and carbon dioxide, d shows a carbon dioxide curve, and e shows a carbon monoxide curve; before converting, the opening of the two-text laryngeal opening is set to 65 percent according to manual experience. When blowing is started, the following contents are specifically included:
1) When the interior of the converter is in a charging state, the opening of the converter II throat is set as follows: increasing the opening by 5% to 70% on the basis of the initial value, and returning to the initial value after maintaining for 20 seconds;
2) When the converter blows to a slag point, the carbon monoxide concentration of the top gas is 20% -27% greater than a set value, or when the carbon dioxide concentration value of the top gas starts to decrease from rising, smoke dust starts to become large and has a splashing trend, and the opening of the two venturi throat of the converter is set as follows: increasing the opening by 10% on the basis of 65% of the initial value, and returning to the initial value after maintaining for 1 minute;
3) When the converter blows to a slag point, the method comprises the following steps:
step S1, when the light intensity value of the converter mouth is smaller than a set threshold 27, the flue gas is overlarge, light is blocked, and the opening of the converter II throat is set as follows: the opening degree is increased by 10 percent on the basis of 65 percent of the initial value, and the initial value is returned after the light intensity value reaching the converter mouth is maintained to be recovered to the set threshold value 32;
s2, when the light intensity value of the lower edge of the converter mouth is larger than a set threshold value 50, steel slag overflows to the lower edge of the converter mouth, and the opening of the converter II throat is set as follows: the opening degree is increased by 10 percent on the basis of 65 percent of the initial value, and the light intensity value which is maintained to the lower edge of the converter mouth is restored to the set threshold value 45, so that the initial value is returned;
4) When the converter blows to a slag point, and the sonar slag measurement value falls in a dry return area, the generated smoke is reduced, and the opening of the second venturi throat of the converter is set as follows: reducing the opening by 10% on the basis of 65% of the initial value, and returning to the initial value after the sonar slag measurement value is separated from the dry return area for increasing the gas recovery rate;
5) Before the converter sublance process test, if the sum of the detected carbon monoxide concentration and the carbon dioxide concentration suddenly drops and the sonar slag measurement value falls in a splash zone, the molten steel splashing is about to happen, and the opening of the throat of the converter II is set as follows: increasing the opening by 10% on the basis of 65% of the initial value, and returning to the initial value when the sum content slope of the carbon monoxide concentration and the carbon dioxide concentration is greater than zero or the sonar slag measurement value is separated from the splashing region;
6) When the temperature of the molten steel is very high and approaches to the smelting end point, the opening of the second venturi throat of the converter is restored to 65% of the initial value when the light intensity value of the furnace mouth becomes stronger to the set threshold 72.
According to the invention, the flue gas analyzer, the flame machine vision device and the audio signal acquisition device are used for acquiring the gas content of the top gas, the light intensity of the converter mouth or the change of the light intensity at the lower edge of the converter mouth, and the data information of the slag measuring value of the converter blowing sonar, and transmitting the acquired data information to the PLC/DCS system, when the converter is in a charging state, the opening degree of the converter secondary throat in the converter blowing process is automatically controlled, the manual intervention is not needed, the smoke overflow is reduced, the gas recovery rate is improved, and the production safety is maintained.
Claims (4)
1. The method for automatically controlling the opening of the second venturi throat of the converter is realized based on a PLC/DCS system, and is characterized in that an empirical value before starting converting is taken as an initial value of the opening of the second venturi throat of the converter, and the method specifically comprises the following steps when the converter starts converting:
1) When the interior of the converter is in a charging state, the opening of the converter II throat is set as follows: increasing the opening degree I on the basis of the initial value, and returning to the initial value after maintaining the set time I;
2) When the converter blows to a slag point, the sum of the carbon monoxide concentration and the carbon dioxide concentration of the top gas is larger than a first set value, or the carbon dioxide concentration of the top gas is larger than a second set value, and the opening of a throat of the converter II is set as follows: increasing the opening II on the basis of the initial value, maintaining the setting time II, and returning to the initial value;
3) When the converter blows to a slag point, the method comprises the following steps:
s1, setting the opening of a converter II throat as: increasing the opening III on the basis of the initial value, and returning to the initial value after the light intensity value reaching the converter mouth is restored to the set threshold value;
s2, when the light intensity value of the lower edge of the converter mouth is larger than a second set threshold value, setting the opening of the converter II throat to be: increasing the opening fourth on the basis of the initial value, and returning the initial value after the light intensity value reaching the lower edge of the converter mouth is maintained to be restored to the set threshold value II;
4) When the converter blows to a slag point and the sonar slag measurement value falls in the dry return area, the opening of the second venturi throat of the converter is set as follows: reducing the opening five on the basis of the initial value, and returning to the initial value after the sonar residue detection value is separated from the dry return region;
5) Before the converter sublance process test, if the sum of the carbon monoxide concentration and the carbon dioxide concentration of the top gas is detected to suddenly drop, and the sonar slag detection value falls in a splash zone, setting the opening of the converter II throat to be: increasing the opening by six on the basis of the initial value, and returning to the initial value when the sonar slag measurement value is separated from the splashing region or when the slope of the sum of the carbon monoxide concentration and the carbon dioxide concentration of the top gas is greater than zero;
6) When the temperature of the molten steel approaches to the smelting end point, the light intensity value of the furnace mouth becomes strong, and the opening of the second venturi throat of the converter is restored to the initial value.
2. The method for automatically controlling the opening of the two-venturi throat of the converter according to claim 1, wherein the converter sonar slag measurement value is a sound intensity value of fixed-frequency sound.
3. The method for automatically controlling the opening degree of a two-venturi throat of a converter according to claim 1, wherein the carbon monoxide concentration of the top gas and the carbon dioxide concentration of the top gas are detected by a flue gas analyzer, and the flue gas analyzer is arranged at the tail end of the rising section of the vaporization cooling flue of the waste heat boiler of the converter; the light intensity value of the converter mouth or the strong light value of the lower edge of the converter mouth is detected by a flame machine vision device which is arranged right opposite to the converter fire door; the sonar slag measurement value is detected through a flame machine vision device, and the flame machine vision device is arranged on the side wall of the trunnion of the converter and is opposite to the furnace mouth.
4. The method for automatically controlling the opening of the two-venturi throat of the converter according to claim 3, wherein the flame machine vision device comprises a camera, the flame machine vision device comprises a sound sensor, and the smoke analyzer, the flame machine vision device and the flame machine vision device are all connected with the PLC/DCS system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310753575.XA CN116622929A (en) | 2023-06-26 | 2023-06-26 | Method for automatically controlling opening degree of two-venturi throat of converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310753575.XA CN116622929A (en) | 2023-06-26 | 2023-06-26 | Method for automatically controlling opening degree of two-venturi throat of converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116622929A true CN116622929A (en) | 2023-08-22 |
Family
ID=87617172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310753575.XA Pending CN116622929A (en) | 2023-06-26 | 2023-06-26 | Method for automatically controlling opening degree of two-venturi throat of converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116622929A (en) |
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2023
- 2023-06-26 CN CN202310753575.XA patent/CN116622929A/en active Pending
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