CN108342540B - A kind of steel mill RH refining equipment automatic control system - Google Patents
A kind of steel mill RH refining equipment automatic control system Download PDFInfo
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- CN108342540B CN108342540B CN201810348808.7A CN201810348808A CN108342540B CN 108342540 B CN108342540 B CN 108342540B CN 201810348808 A CN201810348808 A CN 201810348808A CN 108342540 B CN108342540 B CN 108342540B
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- 239000010959 steel Substances 0.000 title claims abstract description 139
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 135
- 238000007670 refining Methods 0.000 title claims abstract description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 73
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 73
- 239000001301 oxygen Substances 0.000 claims abstract description 73
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 69
- 239000000956 alloy Substances 0.000 claims abstract description 69
- 238000005261 decarburization Methods 0.000 claims abstract description 66
- 238000007664 blowing Methods 0.000 claims abstract description 52
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 41
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000004422 calculation algorithm Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 17
- 238000012545 processing Methods 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 5
- 239000002436 steel type Substances 0.000 claims description 5
- 229910010340 TiFe Inorganic materials 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 3
- 239000006187 pill Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 238000003763 carbonization Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000004886 process control Methods 0.000 description 3
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910002467 CrFe Inorganic materials 0.000 description 1
- 229910005347 FeSi Inorganic materials 0.000 description 1
- 229910005438 FeTi Inorganic materials 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910013496 M-Mn Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention provides a kind of steel mill RH refining equipment automatic control systems, comprising: module, temperature control modules and terminal control module is added in parameter acquisition input module, Decarburization Control module, alloy；Wherein, molten steel is initial and target data for obtaining or inputting for parameter acquisition input module；Decarburization Control module is used for carbon content configuration carbonization treatment time and decarburization blowing oxygen quantity parameter according to molten steel initially and in target data；Alloy is added module and is used for initial molten steel based on the received and target data configuration alloy addition and molten steel acid aluminum melting amount parameter；Temperature control modules initial, target data and alloy addition parameter configuration heating blowing oxygen quantity, heating plus aluminum amount or adding amount of scrap steel parameter for molten steel based on the received；Terminal control module is used to receive the parameter of above-mentioned each module configuration, based on the received parameter configuration control instruction, and is respectively sent to oxygen rifle system, vacuum pump system and the alloy system of RH refining equipment.
Description
Technical Field
The invention relates to the technical field of control, in particular to an automatic control system of RH refining equipment of a steel plant.
Background
Vacuum refining is a refining means commonly adopted in the current steel production, can produce high-quality steel grade with high purity, and meets the requirements of social development on the performance of steel. At present, RH refining technology has been developed from the original single degassing to the multifunctional external refining technology of decarburization, molten steel temperature and component homogenization, desulfurization, dephosphorization and the like, and becomes an essential refining process for smelting a plurality of high-quality steel grades. Because the high-temperature metallurgical reaction in RH refining occurs in a closed vacuum chamber, the process is quite complex, and relates to the processes of flowing, heat transfer, complex reaction and the like, people have quite difficult understanding on the high-temperature metallurgical reaction, and the reaction mechanism, the reaction behavior and the reaction process in the refining process can be judged only through analysis and estimation. At present, the analysis and judgment of the refining process mainly depend on manual operation, particularly, sampling, temperature measurement and analysis are needed at intervals in RH oxygen blowing decarburization and alloying smelting processes, and then the operation process is determined to adjust the components and the temperature of the molten steel.
Compared with the advanced production and research level in foreign countries, China has a small gap in RH process control simulation development and application, and basically has no technology of RH refining simulation control set. In actual production, process control process simulation software which is directly purchased from abroad and matched with equipment is very expensive, and meanwhile, the problem of matching with specific RH refining equipment exists, and the refining process is influenced on the contrary if the matching is not good. And with the continuous progress of the refining level, the production process and the raw material level are continuously changed, so that the adjustment of the introduced model is relatively difficult. In recent years, the problems draw more and more attention of metallurgy workers, and the development of economic and applicable prediction simulation software combined with domestic actual production technology is urgent, particularly on-line control technology, and the solution of the problems has important significance for improving the RH refining level in China and promoting the development of steelmaking technology.
Disclosure of Invention
The invention aims to provide an automatic control system of RH refining equipment in a steel plant, so as to perform predictive simulation and automatic control on the RH refining equipment.
In order to solve the problems, the invention adopts the following technical scheme:
an automatic control system of RH refining equipment of a steel plant comprises:
the system comprises a parameter acquisition input module, a decarburization control module, an alloy adding module, a temperature control module and a terminal control module; wherein,
the parameter acquisition input module is used for acquiring initial molten steel data through a sensor and receiving or acquiring molten steel target data based on table lookup;
the decarburization control module is connected with the parameter acquisition input module and is used for configuring decarburization processing time and decarburization oxygen blowing quantity parameters according to the carbon content in the initial molten steel data and the target molten steel data;
the alloy adding module is connected with the parameter acquisition input module and is used for configuring alloy adding amount and molten steel acid-melting aluminum amount parameters according to the received molten steel initial data and molten steel target data;
the temperature control module is connected with the parameter acquisition input module and the alloy adding module and is used for configuring heating oxygen blowing amount, heating aluminum adding amount or scrap steel adding amount parameters according to the received molten steel initial data, molten steel target data and alloy adding amount parameters;
the terminal control module is respectively connected with the decarburization control module, the alloy adding module and the temperature control module, and is used for receiving the parameters configured by the modules, configuring a control instruction according to the received parameters, and respectively sending the control instruction to an oxygen lance system, a vacuum pump system and an alloy system of the RH refining equipment.
Furthermore, the parameter acquisition input module comprises a sampling unit, a steel grade information input unit, a decarburization parameter input unit, a temperature control parameter input unit and a molten steel component input unit.
Further, the molten steel initial data includes steel type information, molten steel initial components, initial temperature, molten steel initial carbon concentration, molten steel initial oxygen concentration and initial weight, and the molten steel target data includes molten steel target components, target temperature, molten steel target carbon concentration, molten steel free oxygen concentration after decarburization and target weight.
Further, the decarbonization control module includes:
the mode selection unit is used for selecting a pump mode based on steel type information;
the forced oxygen blowing judgment unit is used for judging whether to perform forced oxygen blowing decarburization or not according to the received molten steel initial data and a preset algorithm;
a decarburization processing time calculation unit for calculating a decarburization processing time according to a preset algorithm;
and a decarburization oxygen blowing amount calculation unit for calculating the decarburization oxygen blowing amount according to a preset algorithm.
Further, the temperature control module includes:
the forecast temperature calculation unit is used for calculating forecast temperature according to the received molten steel initial data, molten steel target data and alloy addition quantity parameters and comparing the forecast temperature with the target temperature;
the heating oxygen blowing amount calculating unit is used for calculating the heating oxygen blowing amount according to a preset algorithm when the forecast temperature is less than or equal to the target temperature;
the heating aluminum adding amount calculating unit is used for calculating the heating aluminum adding amount according to a preset algorithm when the forecast temperature is less than or equal to the target temperature;
and a scrap steel addition amount calculation unit for calculating the scrap steel addition amount according to a preset algorithm when the forecast temperature is greater than the target temperature.
Further, the terminal control module includes:
the total oxygen blowing amount calculating unit is used for calculating the total oxygen blowing amount according to the received decarburization oxygen blowing amount and the heating oxygen blowing amount parameters;
the total aluminum shot adding amount calculating unit is used for calculating the total aluminum shot adding amount according to the received parameters of the heating oxygen blowing amount, the heating aluminum adding amount and the molten steel acid molten aluminum amount;
the instruction configuration unit is used for configuring a decarburization processing instruction according to the received total oxygen blowing amount, decarburization processing time, scrap steel addition amount parameters and a pump mode, configuring a holding time and an aluminum adding instruction after decarburization is finished, and configuring an alloy addition instruction according to the received alloy addition amount parameters after aluminum adding is finished;
and the instruction sending unit is used for sending the instructions configured by the instruction configuration unit to an oxygen lance system, a vacuum pump system and an alloy system of the RH refining equipment.
The invention has the beneficial effects that: the method can realize the calculation/simulation of each process control parameter in the RH refining process and the generation of related control instructions based on the initial molten steel data and the target molten steel data which are detected by a sensor or input by workers and the intermediate detection/input data in the process, thereby realizing the high-efficiency prediction simulation and automatic control of RH refining equipment, greatly improving the simulation and production efficiency and having good economic benefit.
Drawings
FIG. 1 is a schematic view of the composition of an RH refining apparatus.
FIG. 2 is a schematic diagram of the control system of the present invention.
FIG. 3 is a schematic diagram of the components and connections of unit modules according to the control system of the present invention.
Fig. 4 is a control flow diagram of the control system according to the embodiment of the present invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
As shown in FIG. 1, the RH refining equipment comprises a ladle 1, a vacuum chamber 2, an oxygen lance system 3, a vacuum pump system 4 and an alloy system 5, wherein the oxygen lance system 3 comprises an oxygen lance 31, a cooling water unit 32 and a gas distribution unit 33, and the alloy system 5 comprises an alloy bin 51, a weighing unit 52 and the like. Since the specific structure and composition of the RH refining apparatus are well known to those skilled in the art, they will not be described in detail herein.
As shown in fig. 2, the present invention provides an automatic control system of RH refining apparatus of steel mill, comprising:
the system comprises a parameter acquisition input module, a decarburization control module, an alloy adding module, a temperature control module and a terminal control module; wherein,
the parameter acquisition input module is used for acquiring initial molten steel data through a sensor and receiving or acquiring molten steel target data based on table lookup;
the decarburization control module is connected with the parameter acquisition input module and is used for configuring decarburization processing time and decarburization oxygen blowing quantity parameters according to the carbon content in the initial molten steel data and the target molten steel data;
the alloy adding module is connected with the parameter acquisition input module and is used for configuring alloy adding amount and molten steel acid-melting aluminum amount parameters according to the received molten steel initial data and molten steel target data;
the temperature control module is connected with the parameter acquisition input module and the alloy adding module and is used for configuring heating oxygen blowing amount, heating aluminum adding amount or scrap steel adding amount parameters according to the received molten steel initial data, molten steel target data and alloy adding amount parameters;
the terminal control module is respectively connected with the decarburization control module, the alloy adding module and the temperature control module, and is used for receiving the parameters configured by the modules, configuring a control instruction according to the received parameters, and respectively sending the control instruction to an oxygen lance system, a vacuum pump system and an alloy system of the RH refining equipment.
Fig. 3 is a schematic diagram showing the components and connections of unit modules of the control system according to the embodiment of the present invention, and the control system according to the present invention is further described in detail with reference to the flowchart shown in fig. 4.
As a preferred embodiment, the parameter acquisition input module comprises a sampling unit, a steel grade information input unit, a decarburization parameter input unit, a temperature control parameter input unit and a molten steel component input unit, and the obtained, received or inquired molten steel initial data comprises steel grade information, molten steel initial components Sj, initial temperatures T0Initial carbon concentration of molten steel [ C ]]0Initial oxygen concentration of molten steel [ O ]]0And initial weight, molten steel target data including target composition of molten steel, target temperature TTargetTarget carbon concentration of molten steel [ C ]]aimAnd the free oxygen concentration [ O ] of the molten steel after the decarburization]endAnd target weight WsteelAnd the like.
Wherein the initial temperature T0And initial oxygen concentration [ O ] of molten steel]0Obtained by sampling and measuring, steel type information, initial composition Sj of molten steel and initial carbon concentration [ C ] of molten steel]0The data are obtained by a query quality inspection table, and the molten steel target data are input by an operator according to relevant requirements.
As a preferred embodiment, the decarburization control module includes:
and the mode selection unit is used for selecting the pump mode based on the steel grade information. Specifically, the following table may be used:
TABLE 0 decarburization model formula coefficients
The forced oxygen blowing judgment unit is used for judging whether to perform forced oxygen blowing decarburization or not according to the received molten steel initial data and a preset algorithm; the preset algorithm here may be selected as:
if: [ O ]]0≥([C]0-[C]aim)×1.33+[O]endFormula (1)
Oxygen is not blown; otherwise, oxygen is blown.
The decarburization oxygen blowing amount calculation unit is used for calculating decarburization oxygen blowing amount according to a preset algorithm; the preset algorithm here may be selected as:
wherein,the oxygen blowing amount is needed for forced decarburization, and beta is an oxygen blowing efficiency parameter.
And a decarburization processing time calculation unit for calculating a decarburization processing time according to a preset algorithm; the preset algorithm here may be selected as:
[C]t＝[C]0exp(-kc·tdecarburization time) Formula (3)
Wherein [ C]tCarbon concentration, k, of molten steel at time tcAs a rate constant of decarburization,
tdecarburization time＝kc -1ln([C]0/[C]aim) Formula (3-1)
As a preferred embodiment, the temperature control module comprises:
the forecast temperature calculation unit is used for calculating forecast temperature according to the received molten steel initial data, molten steel target data and alloy addition quantity parameters and comparing the forecast temperature with the target temperature; wherein the predicted temperature is optionally calculated by:
Tforecasting＝T0+TDEO+TDEC+TALLOY+TVAC+TLADLEFormula (4)
Wherein TDEO is oxygen decarburization temperature variation, TDEC＝([C]0-[C]aim)×KcoKco is the temperature change per 100ppm of C; t isDECFor the aluminium deoxidation temperature variation, TDEO＝[O]end×qAl-o/100，qAl-oIs composed of
Temperature change per 100ppm O removed; t isALLOYTemperature drop for alloy addition (excluding aluminum pellets), TALLOY ═ Sigma (W)j×Kj)/1000，WjTo add the alloy amount, KjIs the temperature drop coefficient of the alloy; TVAC is vacuum
The room state causes temperature drop, different vacuum conditions of the steel plant are statistically analyzed, and manual set values are given, generally the values are 2-3 ℃, and TLADLEIs the natural temperature drop of the ladle, TLADLE＝KLADLE×tTime of treatment，KLADLEIs the ladle temperature drop coefficient, tTime of treatmentThe RH treatment time.
A scrap steel addition amount calculation unit for calculating T when the predicted temperature is higher than the target temperatureForecasting＞TTargetCalculating the addition amount of the scrap steel according to a preset algorithm; the preset algorithm here may be selected as:
Wscrap steel＝[(TTarget-TForecasting)×1000]/KSCARPFormula (5)
Wherein KSCARPIs the temperature drop coefficient of clean scrap steel.
A temperature-rising oxygen-blowing amount calculating unit for calculating T when the predicted temperature is less than or equal to the target temperatureForecasting≤TTargetCalculating the heating oxygen blowing amount according to a preset algorithm; the preset algorithm here may be selected as:
wherein q iso2Is blown to 1m3O2Temperature variation parameters of the molten steel.
And a temperature rise and aluminum addition amount calculation unit for calculating T when the forecast temperature is less than or equal to the target temperatureForecasting≤TTargetCalculating the heating and aluminum adding amount according to a preset algorithm; the preset algorithm here may be selected as:
as a preferred embodiment, the terminal control module includes:
and the total oxygen blowing amount calculating unit is used for calculating the total oxygen blowing amount according to the received decarburization oxygen blowing amount and the heating oxygen blowing amount parameters:
the total aluminum shot adding amount calculating unit is used for calculating the total aluminum shot adding amount according to the received parameters of the heating oxygen blowing amount, the heating aluminum adding amount and the molten steel acid molten aluminum amount; optionally calculated by:
WAL＝WS-AL+WDE-AL+WAls-0.15WTiFeformula (10)
Wherein, WDE-ALThe amount of the added aluminum is the deoxidizer,
WDE-AL＝1.127×10-3[O]end×Wsteelformula (8)
WAlsThe amount of the molten steel acid-melted aluminum,
WALs＝(MAls-SAls)×Wsteelx 1000 formula (9)
MAlsIs the target Al content, S, of the molten steelAlsW is the initial Al content of the molten steelTiFeCalculated for the ferrotitanium alloy.
In addition, when the alloy adding module calculates the adding amount of the alloy, the target value setting of related elements is needed according to the smelting steel species standard, and the components of a sample arriving at a station and a sample ending in the previous working procedure are known; the formula for calculating the addition amount of the alloy can be selected as follows:
Wj＝(Mi-Si)×Wsteel×1000/(ηi-j×￡j) Formula (11)
Wherein M isiIs the target value of molten steel element, SiIs the initial value of molten steel element etai-jIs the content of alloy components and can be obtained by inquiring the alloy component table 1, wherein £ isjThe yield of the alloy can be obtained by inquiring the yield table 2 of the alloy elements.
TABLE 1 alloy composition Table
TABLE 2 yield of alloying elements
| Alloy (I) | Si | Al | Ti | Ca | Symbol of yield | The yield is% |
| Low-carbon ferrosilicon | 76 | ￡FeSi | 97 | |||
| Carburant | ￡C | 96 | ||||
| Manganese metal | ￡M-Mn | 98 | ||||
| Low carbon manganese | ￡LC-Mn | 96 | ||||
| Medium carbon manganese | ￡MC-Mn | 94 | ||||
| Aluminum pill | 99 | ￡AL | 96 | |||
| Ferrotitanium | 60 | ￡FeTi | 94 | |||
| Low-carbon ferrochrome | ￡LC-CrFe | 92 | ||||
| Ferro-phosphorus | ￡P-Fe | 90 | ||||
| Ferroboron | ￡B-Fe | 85 |
Finally, the terminal control module further comprises:
the instruction configuration unit is used for configuring a decarburization processing instruction according to the received total oxygen blowing amount, decarburization processing time, scrap steel addition amount parameters and a pump mode, configuring a holding time and an aluminum adding instruction after decarburization is finished, and configuring an alloy addition instruction according to the received alloy addition amount parameters after aluminum adding is finished;
and the instruction sending unit is used for sending the instruction configured by the instruction configuration unit to an oxygen lance system, a vacuum pump system and an alloy system of the RH refining equipment so as to control the RH refining equipment to complete oxygen blowing, decarburization and various alloy adding operations.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (2)
1. An automatic control system of RH refining equipment of a steel plant is characterized by comprising:
the system comprises a parameter acquisition input module, a decarburization control module, an alloy adding module, a temperature control module and a terminal control module; wherein,
the parameter acquisition input module is used for acquiring initial molten steel data through a sensor and receiving or acquiring molten steel target data based on table lookup; the molten steel initial data comprises steel type information, molten steel initial components Sj and initial temperature T0Initial carbon concentration of molten steel [ C ]]0Initial oxygen concentration of molten steel [ O ]]0And an initial weight, the molten steel target data including a molten steel target composition, a target temperature TTargetTarget carbon concentration of molten steel [ C ]]aimAnd the free oxygen concentration [ O ] of the molten steel after the decarburization]endAnd target weight Wsteel；
The decarburization control module is connected with the parameter acquisition input module and is used for configuring decarburization processing time and decarburization oxygen blowing quantity parameters according to the carbon content in the initial molten steel data and the target molten steel data; the method specifically comprises the following steps:
the mode selection unit is used for selecting a pump mode based on steel type information;
the forced oxygen blowing judgment unit is used for judging whether to perform forced oxygen blowing decarburization or not according to the received molten steel initial data and a preset algorithm; the preset algorithm is as follows: if [ O ]]0≥([C]0-[C]aim)×1.33+[O]endOxygen is not blown; otherwise, blowing oxygen;
the decarburization oxygen blowing amount calculation unit is used for calculating decarburization oxygen blowing amount according to a preset algorithm; the preset algorithm is as follows:wherein,oxygen blowing amount is needed for forced decarburization, and beta is an oxygen blowing efficiency parameter;
and a decarburization processing time calculation unit for calculating a decarburization processing time according to a preset algorithm; the preset algorithm is as follows: [ C ]]t＝[C]0exp(-kc·tDecarburization time) Wherein [ C ]]tCarbon concentration, k, of molten steel at time tcIs a decarburization rate constant, tDecarburization time＝kc -1ln([C]0/[C]aim)；
The alloy adding module is connected with the parameter acquisition input module and is used for configuring alloy adding amount and molten steel acid-soluble aluminum amount parameters according to the received molten steel initial data and molten steel target data; the formula for calculating the addition of the alloy is as follows:
Wj＝(Mi-Si)×Wsteel×1000/(ηi-j×￡j)
wherein M isiIs the target value of molten steel element, SiIs the initial value of molten steel element etai-jIs the content of alloy components, and is obtained by inquiring an alloy component table, wherein £ isjObtaining the yield of the alloy by inquiring an alloy element yield table;
the temperature control module is connected with the parameter acquisition input module and the alloy adding module and is used for configuring heating oxygen blowing amount, heating aluminum adding amount or scrap steel adding amount parameters according to the received molten steel initial data, molten steel target data and alloy adding amount parameters; the method specifically comprises the following steps:
the forecast temperature calculation unit is used for calculating forecast temperature according to the received molten steel initial data, molten steel target data and alloy addition quantity parameters and comparing the forecast temperature with the target temperature; wherein the predicted temperature is calculated by:
Tforecasting＝T0+TDEO+TDEC+TALLOY+TVAC+TLADLE
Wherein, TDEOFor oxygen decarburization temperature variation, TDEC＝([C]0-[C]aim)×Kco，KcoTemperature change per 100ppm of C; t isDECFor the aluminium deoxidation temperature variation, TDEO＝[O]end×qAl-o/100，qAl-oTemperature change for every 100ppm of O removed; t isALLOYTemperature drop due to alloy addition when aluminum pellets are not included, TALLOY＝∑(Wj×Kj)/1000，WjTo add the alloy amount, KjIs the temperature drop coefficient of the alloy; t isVACThe temperature drop is caused by the vacuum chamber state, and an artificial set value, T, is given by statistically analyzing different vacuum conditions of the steel plantLADLEIs the natural temperature drop of the ladle, TLADLE＝KLADLE×tTime of treatment，KLADLEIs the ladle temperature drop coefficient, tTime of treatmentRH treatment time;
the heating oxygen blowing amount calculating unit is used for calculating the heating oxygen blowing amount according to a preset algorithm when the forecast temperature is less than or equal to the target temperature; the preset algorithm is as follows:wherein q iso2Is blown to 1m3O2Temperature variation parameters of the molten steel;
the heating aluminum adding amount calculating unit is used for calculating the heating aluminum adding amount according to a preset algorithm when the forecast temperature is less than or equal to the target temperature; the preset algorithm is as follows:
the scrap steel adding amount calculating unit is used for calculating the scrap steel adding amount according to a preset algorithm when the forecast temperature is higher than the target temperature; the preset algorithm is as follows: wScrap steel＝[(TTarget-TForecasting)×1000]/KSCARPIn which K isSCARPThe temperature drop coefficient of the clean scrap steel is shown;
the terminal control module is respectively connected with the decarburization control module, the alloy adding module and the temperature control module, and is used for receiving parameters configured by the modules, configuring a control instruction according to the received parameters, and respectively sending the control instruction to an oxygen lance system, a vacuum pump system and an alloy system of the RH refining equipment; the method specifically comprises the following steps:
a total oxygen blowing amount calculation unit for calculating the total oxygen blowing amount based on the received decarburization oxygen blowing amount and the temperature rise oxygen blowing amountCalculating the total oxygen blowing amount according to the parameters:
and the total aluminum pill adding amount calculating unit is used for calculating the total aluminum pill adding amount according to the received parameters of the heating oxygen blowing amount, the heating aluminum adding amount and the molten steel acid-soluble aluminum amount through the following formula:
WAL＝WS-AL+WDE-AL+WAls-0.15WTiFe
wherein, WDE-ALThe amount of the added aluminum is the deoxidizer,
WDE-AL＝1.127×10-3[O]end×Wsteel
WAlsthe amount of the molten steel dissolved in the aluminum is,
WALs＝(MAls-SAls)×Wsteel×1000
MAlsis the target Al content, S, of the molten steelAlsW is the initial Al content of the molten steelTiFeCalculating the amount of the ferrotitanium alloy;
the instruction configuration unit is used for configuring a decarburization processing instruction according to the received total oxygen blowing amount, decarburization processing time, scrap steel addition amount parameters and a pump mode, configuring a holding time and an aluminum adding instruction after decarburization is finished, and configuring an alloy addition instruction according to the received alloy addition amount parameters after aluminum adding is finished;
and the instruction sending unit is used for sending the instructions configured by the instruction configuration unit to an oxygen lance system, a vacuum pump system and an alloy system of the RH refining equipment.
2. The automatic control system of RH refining equipment of steel mill according to claim 1, wherein said parameter collection input module comprises a sampling unit, a steel grade information input unit, a decarburization parameter input unit, a temperature control parameter input unit and a molten steel composition input unit.
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| CN109777923B (en) * | 2019-02-28 | 2020-12-15 | 北京首钢股份有限公司 | RH refined alloy adding control method |
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