CN112322823A - Method for calculating oxygen supply curve in converter steelmaking process in stages - Google Patents

Method for calculating oxygen supply curve in converter steelmaking process in stages Download PDF

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CN112322823A
CN112322823A CN202011217055.XA CN202011217055A CN112322823A CN 112322823 A CN112322823 A CN 112322823A CN 202011217055 A CN202011217055 A CN 202011217055A CN 112322823 A CN112322823 A CN 112322823A
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杨凌志
陈凤
郑富强
郭宇峰
李勃
王帅
姜涛
李光辉
李骞
薛波涛
谢泽强
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Central South University
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    • C—CHEMISTRY; METALLURGY
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Abstract

The invention discloses a method for calculating an oxygen supply curve in a converter steelmaking process in stages, which comprises the following steps: dividing the whole smelting process into a plurality of stages, and calculating the oxygen consumption of each stage and corresponding the oxygen consumption to the time of each stage to obtain an oxygen supply curve; and calculating the total mass of the slag, the mass of each component in the slag and the total mass of the molten steel at the end of the stage, taking the result as the initial condition of the next stage, and circularly calculating until the smelting is finished. The invention is based on the principle of material balance calculation in the steelmaking process, calculates the oxygen injection amount in the steelmaking process by using a circular operation method according to the technological requirements of oxygen injection and auxiliary material feeding in the steelmaking process, and provides a theoretical direct method for obtaining an oxygen supply curve in the converter steelmaking process. The method divides the smelting stage into a plurality of equal parts, can more visually express the smelting state of each stage, and guides the field process flow in time through model calculation.

Description

Method for calculating oxygen supply curve in converter steelmaking process in stages
Technical Field
The invention belongs to the field of converter steelmaking, and particularly relates to a method for calculating an oxygen supply curve in a converter steelmaking process.
Background
At present, the automation and intellectualization of the converter steelmaking process have become a development trend. In order to realize one-key steel making of the converter, an oxygen supply curve of an oxygen lance of the converter needs to be set in advance, so that the process requirements (components and temperatures of molten steel and slag) of each stage of the converter are met, and the end point steel tapping requirement is further met. In the actual production process of the steel enterprise, the oxygen supply curve is set according to the judgment of the experience of workers, and when the process requirements of the steel making process need to be changed, the oxygen supply curve is difficult to quantitatively adjust, so that a quick and intuitive method for calculating the oxygen supply curve in the steel making process of the converter is lacked.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects and shortcomings in the background art and provide a method for calculating an oxygen supply curve in a converter steelmaking process based on material balance, which is rapid and intuitive.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for calculating an oxygen supply curve in a converter steelmaking process in stages comprises the following steps: dividing the whole smelting process into a plurality of stages, and calculating the oxygen consumption of each stage and corresponding the oxygen consumption to the time of each stage to obtain an oxygen supply curve;
wherein the total oxygen consumption of a certain stage comprises the total oxygen consumption of the elements of the molten steel and the oxygen consumption of each auxiliary material; the total oxygen consumption of the molten steel elements comprises the total oxygen consumption of carbon element to generate carbon monoxide, the total oxygen consumption of carbon element to generate carbon dioxide, the total oxygen consumption of silicon element to generate silicon dioxide, the total oxygen consumption of manganese element to generate manganese oxide, the total oxygen consumption of phosphorus element to generate phosphorus pentoxide, the total oxygen consumption of sulfur element to generate sulfur dioxide, the total oxygen consumption of sulfur element to generate calcium sulfide, the oxygen consumption of iron element to oxidize into ferrous oxide and the oxygen consumption of iron element to oxidize into ferric oxide;
and calculating the total mass of the slag, the mass of each component in the slag and the total mass of the molten steel at the end of the stage, taking the result as the initial condition of the next stage, and circularly calculating until the smelting is finished.
Further, before calculation in each stage, the composition and temperature of the molten clear sample obtained by mixing the molten iron and the scrap steel are calculated.
Further, the whole smelting stage is divided into a plurality of stages, and the interval between every two stages is 1-3 minutes.
Further, the total mass of oxygen consumed by the carbon element to generate carbon monoxide and the total mass of oxygen consumed by the carbon element to generate carbon dioxide are calculated according to the proportion of the carbon element to generate carbon monoxide or carbon dioxide.
Further, the total oxygen consumption mass of sulfur dioxide generated by the sulfur element and the total oxygen consumption mass of calcium sulfide generated by the sulfur element are calculated according to the proportion of sulfur dioxide or CaS generated by the sulfur element.
Further, according to the content of FeO in the slag and Fe in the slag2O3The oxygen consumption of the iron element oxidized into ferrous oxide and the oxygen consumption of the iron element oxidized into ferric oxide are calculated.
Furthermore, the oxygen consumption of each auxiliary material comprises the oxygen consumption of lime, pellet ore, white magnesium balls, fluorite and dolomite.
Further, the total mass of the molten steel is obtained by subtracting the loss amount of each stage from the original added total mass and adding the mass of the iron carried by the ore.
Compared with the prior art, the invention has the beneficial effects that:
the invention is based on the principle of material balance calculation in the steelmaking process, calculates the oxygen injection amount in the steelmaking process by using a circular operation method according to the technological requirements of oxygen injection and auxiliary material feeding in the steelmaking process, and provides a theoretical direct method for obtaining an oxygen supply curve in the converter steelmaking process. The method divides the smelting stage into a plurality of equal parts, can more visually express the smelting state of each stage, and guides the field process flow in time through model calculation. When the technological requirements for the steel-making process need to be changed, the oxygen supply curve can be conveniently and quantitatively adjusted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a computational flow diagram of one embodiment of the present invention;
FIG. 2 is an oxygen supply curve obtained in the example of the present invention.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Referring to fig. 1, the method for calculating an oxygen supply curve in a converter steelmaking process based on material balance and energy balance principles according to the requirements of the components and temperature in each stage of the converter according to the embodiment of the invention comprises the following steps:
the method comprises the following steps: acquiring initial conditions, collecting the quality and components of various raw materials, and providing the initial conditions for calculating the components of the solution sample in the next step.
Obtaining auxiliary material components which mainly comprise the following components: lime, pellets, white magnesium balls, fluorite, and dolomite.
And collecting the quality of molten iron, scrap steel and molten iron slag initially input into the converter. And obtaining initial calculation conditions of the model.
Wherein HM.W is the weight (Kg) of molten iron, Steel.W is the weight (Kg) of molten steel, Scap.W is the weight (Kg) of scrap steel, and TSZ.W is the weight (Kg) of molten iron slag.
Step two: and (3) molten steel clear sample calculation, wherein the molten clear sample obtained after mixing the molten iron and the scrap steel is subjected to component and temperature calculation, so that basic parameters are provided for subsequent energy balance and oxidation reaction of each element.
And calculating the content value and the temperature value of each element in molten steel after the molten iron and the scrap steel are dissolved and cleared according to the content and the temperature condition of each substance element of the molten iron and the scrap steel.
The proportion of the carbon element in the molten steel is equal to the sum of the proportion of the carbon element in the molten iron multiplied by the mass of the molten iron and the proportion of the carbon element in the scrap multiplied by the mass of the scrap divided by the total mass of the initial molten steel, and the other elements are similar in calculation;
Figure BDA0002760745500000031
Figure BDA0002760745500000032
Figure BDA0002760745500000033
Figure BDA0002760745500000034
Figure BDA0002760745500000035
the temperature of the molten clear liquid steel is calculated according to the specific heat, the latent heat of fusion and the temperature of the molten clear liquid steel.
Figure BDA0002760745500000036
Wherein, Steel.X is the content (%) of each element in the molten steel, and (wherein, X represents C, Si, Mn, P and S). HM.W _ X is the content (%) of each element in molten iron (wherein X represents C, Si, Mn, P, S), Scrap.W _ X is the content (%) of each element in scrap steel (wherein X represents C, Si, Mn, P, S), HM.T is the initial temperature (DEG C) of molten iron, Scrap.T is the initial temperature (DEG C) of scrap steel, CH.MIs the specific heat capacity of molten iron [ J/(kg x DEG C)]，CsteelIs the specific heat capacity of the scrap steel [ J/(Kg. degreeC.)]，Hsteel272000(J) is the latent heat of fusion, T0Is the initial temperature of the molten steel. (. degree. C.)
Step three: and obtaining the component requirements and the technological parameter requirements of the process molten steel at the stage. The process parameters obtained in this stage will affect the subsequent furnace gas calculation, and the calculation of the molten steel quality will use the parameters in this step.
From the third step, the method calculates the oxygen supply amount and auxiliary materials (lime and the like) according to the molten steel component requirements of the corresponding stage of the process; and according to the requirements of the components of the process molten steel, obtaining the requirements of the components of the molten steel at the end of the stage. And acquiring the slag alkalinity requirement at the end of the stage according to the technological parameter requirement. Where HM _ C1 represents the amount of iron beads in the slag as a percentage (%) of the amount of slag, HM _ C2 represents the amount of iron water lost by spattering as a percentage (%) of the amount of iron water, HM _ C3 represents the amount of smoke as a percentage (%) of the amount of iron water, HM _ C4 represents the amount of FeO as a percentage (%) of the amount of FeO, and HM _ C5 represents Fe2O3Is contained in (a%) HM _ C6 represents the percentage (%) of the total amount of molten iron content in the slag splashed on the furnace, HM _ C7 represents the percentage (%) of the total amount of free oxygen content in the furnace gas at 1450 deg.C, and HM _ C8 represents the percentage (%) of O in the oxygen content2Ratio (%) and HM _ C9 represents N in oxygen component2Ratio (%) of the component (A).
Step four: and calculating the oxidation condition of each element in the molten steel in the stage. The oxidation amount of each element (except for Fe) is calculated in the step, and the oxidation product influences the furnace gas.
The reaction in which each element is oxidized mainly includes a reaction with oxygen and a reaction with carbon dioxide, and the oxidation reaction with oxygen is discussed first. The oxidation reaction of all oxygen gases is carried out under known conditions, and carbon monoxide is generated from carbon element at k1, and carbon dioxide is generated at k 2. Sulfur dioxide for k3 and CaS for k 4.
The specific reaction equation is as follows:
2C+O2＝2CO
C+O2＝CO2
Si+O2＝SiO2
2Mn+O2＝2MnO
4P+5O2＝2P2O5
S+O2＝SO2
YHLC-＞CO＝Oxi-C×0.9
Figure BDA0002760745500000041
Figure BDA0002760745500000042
Figure BDA0002760745500000043
the total mass (Kg) of the elements oxidized can be found from the above table, wherein OxiC represents the total mass (Kg) of carbon oxides, Oxi-Si represents the total mass (Kg) of silicon oxides, Oxi-Mn represents the total mass (Kg) of manganese oxides, Oxi-P represents the total mass (Kg) of phosphorus oxides, Oxi-S represents the total mass (Kg) of sulfur oxides, YHLC-＞CORepresents the total mass (Kg) of carbon oxidized to carbon monoxide,
Figure BDA0002760745500000044
represents the total mass (Kg) of carbon oxidized to carbon dioxide,
Figure BDA0002760745500000045
represents the total oxidation mass (Kg) of sulfur to sulfur dioxide, YHLS-＞CaSRepresents the total mass (Kg) of sulfur oxidized to form calcium sulfide.
Figure BDA0002760745500000051
Represents the total mass (Kg) of silicon-to-silica oxidized, YHLMn-＞MnORepresents the total oxidation mass (Kg) of manganese into manganese oxide,
Figure BDA0002760745500000052
represents the total mass (Kg) of phosphorus oxidized to phosphorus pentoxide.
Calculating the oxygen consumption of each element reaction, wherein the specific formula is as follows:
Figure BDA0002760745500000053
Figure BDA0002760745500000054
Figure BDA0002760745500000055
Figure BDA0002760745500000056
Figure BDA0002760745500000057
Figure BDA0002760745500000058
Figure BDA0002760745500000059
HYLC-＞COrepresents the total oxygen consumption (Kg) of carbon element reacting to generate carbon monoxide;
Figure BDA00027607455000000510
represents the total mass (Kg) of oxygen consumed by carbon element to generate carbon dioxide;
Figure BDA00027607455000000511
represents the total oxygen consumption (Kg) of silicon element to generate silicon dioxide; HYLMn-＞MnORepresents the total oxygen consumption (Kg) of manganese element to generate manganese oxide;
Figure BDA00027607455000000512
represents the total oxygen consumption (Kg) of phosphorus element to generate phosphorus pentoxide;
Figure BDA00027607455000000513
represents the total oxygen consumption (Kg) of sulfur element to generate sulfur dioxide; HYLS-＞CaSRepresents the total oxygen consumption (Kg) of sulfur element to form calcium sulfide.
The amount of oxidation products of each element reaction is calculated by the following specific formula:
Figure BDA00027607455000000514
Figure BDA00027607455000000515
Figure BDA0002760745500000061
Figure BDA0002760745500000062
Figure BDA0002760745500000063
Figure BDA0002760745500000064
Figure BDA0002760745500000065
YHCWC-＞COrepresenting the total mass (Kg) of carbon monoxide product,
Figure BDA0002760745500000066
representing the total mass (Kg) of carbon dioxide product,
Figure BDA0002760745500000067
representing the total mass (Kg) of the silica product, YHCWMn-＞MnORepresenting the total mass (Kg) of the manganese oxide product,
Figure BDA0002760745500000068
representing the total mass (Kg) of the phosphorus pentoxide product,
Figure BDA0002760745500000069
representing the total mass (Kg) of sulfur dioxide product, YHCWS-＞CaSRepresents the total mass (Kg) of the calcium sulfide product.
Step five: the additive (lime) contains CaO and SiO2The lime is brought into the slag, and the amount of lime to be added can be calculated from the final slag basicity.
The auxiliary materials mainly comprise: lime, pellets, white magnesium balls, fluorite, dolomite and the like. According to the addition of pellet, white magnesium ball, fluorite and dolomite, calculating CaO and SiO brought into slag in the auxiliary materials2Amount of (2)
Figure BDA00027607455000000610
And
Figure BDA00027607455000000611
the addition of lime is calculated according to the slag alkalinity requirement at the stage. The specific components of the light-burned dolomite and the lime are listed, and the other components are similar.
The light-burned dolomite comprises the following components:
BYS.CaO＝BYS.W×BYS._CaO BYS.SiO2＝BYS.W×BYS._SiO2
BYS.MgO＝BYS.W×BYS._MgO BYS.Al2O3＝BYS.W×BYS._Al2O3
BYS.S＝BYS.W×BYS._S BYS.FeO＝BYS.W×BYS._FeO
BYS.Fe2O3＝BYS.W×BYS._Fe2O3 BYS.H2O＝BYS.W×BYS._H2O
BYS.CaF2＝BYS.W×BYS._CaF2 BYS.P＝BYS.W×BYS._P
BYS.Ta＝BYS.W×BYS._Ta
Figure BDA0002760745500000071
Figure BDA0002760745500000072
wherein BYS.W represents the total mass (Kg) of the dolomite, and BYS.X represents the proportion (%) of each component in the dolomite. BYS.S _ CaO represents the mass (Kg) of calcium oxide consumed by elemental sulfur, BYS.P _ P2O5Representing phosphorus in dolomiteOxidation mass (Kg) of the element.
The lime components are as follows:
SH.CaO＝SH.W×SH._CaO SH.SiO2＝SH.W×SH._SiO2
SH.MgO＝SH.W×SH._MgO SH.Al2O3＝SH.W×SH._Al2O3
SH.S＝SH.W×SH._S SH.FeO＝SH.W×SH._FeO
SH.Fe2O3＝SH.W×SH._Fe2O3 SH.H2O＝SH.W×SH._H2O
SH.CaF2＝SH.W×SH._CaF2 SH.P＝SH.W×SH._P
SH.Ta＝SH.W×SH._Ta
Figure BDA0002760745500000073
Figure BDA0002760745500000074
where sh.w represents the total mass (Kg) of lime and SH · _xrepresents the proportion (%) of each component in the lime. SH.S _ CaO represents the mass (Kg) of calcium oxide consumed by elemental sulfur, SH.P _ P2O5The oxidation mass (Kg) of phosphorus in lime is shown.
The lime addition amount and the components are as follows:
according to the components in the molten steel, the proportion of effective lime is as follows:
SH_YX＝SH._CaO-SH._SiO2×ZZ_JD
where SH _ YX represents the percentage (%) of available lime and SH _ CaO represents the CaO content (%) of the lime. SH (chemical vapor deposition) SiO2Indicating SiO in lime2And ZZ _ JD represents the total final slag basicity (mol/L) of the molten steel.
The mass calculation formula of the added lime is as follows:
Figure BDA0002760745500000081
step six: and (3) carrying out oxidation reaction on the iron element, and calculating the total mass of the slag to obtain the mass of the iron element.
The oxidation reaction of iron element mainly includes the reaction with oxygen and the reaction with carbon dioxide, and the oxidation reaction with oxygen is discussed first, and it is known that the total amount of slag needs to be calculated first.
HM._ZFeO＝Z_FeO+Z_Fe2O3
Figure BDA0002760745500000082
HM. _ ZFeO represents the total iron oxide (%) in the slag, HM. _ TFe represents the total iron content (%), Z _ FeO represents the iron oxide FeO (%) in the slag, and Z _ Fe2O3 represents the iron oxide Fe (Fe) in the slag2O3(％)。
The total amount and components of the final slag are as follows, and the amounts of calcium oxide and silicon dioxide in the slag are similar to each other:
slag.CaO＝SH.CaO+QTK.CaO+TSZ.CaO+BMQ.CaO+YS.CaO+JZC.CaO+BYS.CaO
slag.SiO2＝SH.SiO2+QTK.SiO2+TSZ.SiO2+BMQ.SiO2+YS.SiO2+JZC.SiO2+BYS.SiO2+YHCWSi-＞SiO2
slag.w-Except_Fe＝slag.CaO+slag.SiO2+slag.MgO+slag.Al2O3+slag.CaF2+slag.CaS+slag.P2O5+slag.Ta+slag.MnO
Figure BDA0002760745500000083
and slag.w represents the total mass (Kg) of the slag, slag.w-exception _ Fe represents the total mass (Kg) of the slag from which iron oxides are removed, and slag.x represents the mass (Kg) of each component in the slag. Sh.x represents the mass (Kg) of each component in lime. Tsz. x represents the mass (Kg) of each component in the molten iron slag. BMQ.X represents the respective composition in white magnesium spheresMass in minutes (Kg). Ys.x represents the mass (Kg) of each component in fluorite. And JZC.X represents the mass (Kg) of each component in the slag splashing layer. BYS.X represents the mass (Kg) of each component in dolomite. (wherein X represents CaO, MgO, S, Fe2O3、CaF2、Ta、SiO2、Al2O3、FeO、H2O、P)。
The iron oxide amount calculation formula is as follows:
slag.FeO＝slag.w×Z_FeO
slag.Fe2O3＝slag.w×Z_Fe2O3
slag.FeO_CW＝slag.FeO-JZC.FeO-TSZ.FeO
slag.Fe2O3_CW＝slag.Fe2O3-JZC.Fe2O3-TSZ.Fe2O3
FeO represents the FeO content (Kg) in the slag, slag2O3Represents Fe in slag2O3FeO _ CW represents the mass (Kg) of FeO oxidized in the actual molten iron, and slag Fe2O3"CW" represents Fe oxidized in actual molten iron2O3Mass (Kg) of (c).
The oxidation reaction of iron is specifically as follows:
Figure BDA0002760745500000091
Figure BDA0002760745500000092
Figure BDA0002760745500000093
Figure BDA0002760745500000094
Figure BDA0002760745500000095
Figure BDA0002760745500000096
wherein YHLFe-＞FeORepresents the oxidation amount (Kg) of the iron element to ferrous oxide,
Figure BDA0002760745500000097
represents the oxidation amount (Kg) of iron element into ferric oxide, HYLFe-＞FeORepresents the oxygen consumption (Kg) of ferrous oxide,
Figure BDA0002760745500000098
represents oxygen consumption (Kg) of iron sesquioxide, YHCWFe-＞FeORepresents the product amount (Kg) of ferrous oxide, YHCWFe-＞Fe2O3Represents the amount (Kg) of the product of ferric oxide.
Step seven: and 4, calculating the total oxygen consumption of the stage, calculating the oxygen consumption of each element and the condition of an oxidation product through the fourth step, obtaining the total mass of the stage oxygen consumption, and providing data for drawing a nutrient supply curve in the ninth step.
Firstly, the total oxygen consumption of the molten steel needs to be calculated, and the specific formula is as follows:
Figure BDA0002760745500000099
wherein HM.HYL.w represents the total oxygen consumption (Kg) of the molten steel element.
The furnace gas mainly comprises carbon monoxide, carbon dioxide, sulfur dioxide and water vapor.
The specific mass formula is as follows:
HMC-＞CO＝YHCWC-＞CO
Figure BDA0002760745500000101
Figure BDA0002760745500000102
Figure BDA0002760745500000103
wherein HMC-＞CORepresenting the mass (Kg) of carbon monoxide in the furnace gas,
Figure BDA0002760745500000104
representing the mass (Kg) of carbon dioxide in the furnace gas,
Figure BDA0002760745500000105
representing the mass (Kg) of sulfur dioxide in the furnace gas,
Figure BDA0002760745500000106
representing the mass (Kg) of water vapor in the furnace gas.
The consumption of oxygen in each adjuvant is specifically calculated as follows:
Figure BDA0002760745500000107
HYL_SH.w＝SH.P_P2O5
HYL_QTK.w＝QTK.P_P2O5
HYL_BMQ.w＝BMQ.P_P2O5
HYL_YS.w＝YS.P_P2O5
HYL_BYS.w＝BYS.P_P2O5
HYL_JZC.w＝JZC.P_P2O5
HYL_TSZ.w＝TSZ.P_P2O5
HYL-X.w represents the oxygen consumption (Kg) of each adjuvant. Wherein X represents YC (smoke dust), SH (lime), QTK (pellet), BMQ (white magnesium ball), YS (fluorite), BYS (dolomite), JZC (slag splashing layer) and TSZ (molten iron slag).
Step eight: and calculating the quality and the components of the molten steel and the slag at the end of the stage, and taking the result as the initial condition of the new stage. And repeating the step three by the data obtained in the step eight, and circulating in the way until smelting is finished.
1) Slag:
Figure BDA0002760745500000108
2) calculating the slag components:
slag.CaO＝SH.CaO+QTK.CaO+TSZ.CaO+BMQ.CaO+YS.CaO+JZC.CaO+BYS.CaO
slag.SiO2＝SH.SiO2+QTK.SiO2+TSZ.SiO2+BMQ.SiO2+YS.SiO2+JZC.SiO2+BYS.SiO2+YHCWSi-＞SiO2
slag.MgO＝SH.MgO+QTK.MgO+TSZ.MgO+BMQ.MgO+YS.MgO+JZC.MgO+BYS.MgO
slag.Al2O3＝SH.Al2O3+QTK.Al2O3+TSZ.Al2O3+BMQ.Al2O3+YS.Al2O3+JZC.Al2O3+BYS.Al2O3
slag.CaF2＝SH.CaF2+QTK.CaF2+TSZ.CaF2+BMQ.CaF2+YS.CaF2+JZC.CaF2+BYS.CaF2
slag.CaS＝SH.CaS+QTK.CaS+TSZ.CaS+BMQ.CaS+YS.CaS+JZC.CaS+BYS.CaS+YHCWS-＞CaS
Figure BDA0002760745500000111
slag.Ta＝SH.Ta+QTK.Ta+TSZ.Ta+BMQ.Ta+YS.Ta+JZC.Ta+BYS.Ta
slag.MnO＝SH.MnO+QTK.MnO+TSZ.MnO+BMQ.MnO+YS.MnO+JZC.MnO+BYS.MnO
x represents the mass (Kg) of each component in the slag, (wherein X represents CaO, SiO2、MgO、Al2O3、CaF2、CaS、P2O5、Ta、MnO)。
3) Molten steel
The total mass of the molten steel is the mass of the final molten steel obtained by subtracting the loss of each stage from the total mass of the original molten steel.
The blowing loss calculation formula in smelting is as follows:
HM.C1＝HM_C1×slag.w
HM.C2＝HM_C2×100
HM.C3＝HM_C3×100
Figure BDA0002760745500000112
HM.C7＝YHL.O-w
Figure BDA0002760745500000113
HM_Aim.w＝100-HM.C1-HM.C2-HM.C4_Fe-HM.C7+HM.C8
where hm.c1 represents the loss mass (Kg) of iron globules in the slag, hm.c2 represents the loss mass (Kg) of splashing, hm.c3 represents the loss mass (Kg) of soot, hm.c4_ Fe loss mass (Kg) of iron in soot, hm.c7 represents the loss mass (Kg) of elemental oxidation, hm.c8 represents the mass (Kg) of iron carried in the ore, and HM _ aim.w represents the mass (Kg) of the target molten steel. And repeating the step three, circulating the process till the smelting is finished, obtaining the oxygen consumption and the lime consumption of each stage, and finally obtaining an oxygen supply curve.
Step nine: drawing oxygen supply curve
Obtaining the oxygen consumption of each stage by calculating the oxygen consumption of each element and the total oxygen consumption in the step seven1Oxygen consumption2Oxygen consumption3Oxygen consumption4And equally dividing the whole smelting stage into sixteen equal parts, wherein each stage is separated by two minutes, the X axis of the curve represents time, the Y axis represents oxygen flow, and the time of each stage corresponds to the oxygen flow one by one to finally obtain an oxygen supply curve, as shown in figure 2.
The invention provides a theoretical direct method for obtaining an oxygen supply curve in the converter steelmaking process. The method divides the smelting stage into a plurality of equal parts, can more visually express the smelting state of each stage, and guides the field process flow in time through model calculation.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (8)

1. A method for calculating an oxygen supply curve in a converter steelmaking process in stages is characterized by comprising the following steps: dividing the whole smelting process into a plurality of stages, and calculating the oxygen consumption of each stage and corresponding the oxygen consumption to the time of each stage to obtain an oxygen supply curve;
wherein the total oxygen consumption of a certain stage comprises the total oxygen consumption of the elements of the molten steel and the oxygen consumption of each auxiliary material; the total oxygen consumption of the molten steel elements comprises the total oxygen consumption of carbon element to generate carbon monoxide, the total oxygen consumption of carbon element to generate carbon dioxide, the total oxygen consumption of silicon element to generate silicon dioxide, the total oxygen consumption of manganese element to generate manganese oxide, the total oxygen consumption of phosphorus element to generate phosphorus pentoxide, the total oxygen consumption of sulfur element to generate sulfur dioxide, the total oxygen consumption of sulfur element to generate calcium sulfide, the oxygen consumption of iron element to oxidize into ferrous oxide and the oxygen consumption of iron element to oxidize into ferric oxide;
and calculating the total mass of the slag, the mass of each component in the slag and the total mass of the molten steel at the end of the stage, taking the result as the initial condition of the next stage, and circularly calculating until the smelting is finished.
2. The method of claim 1, wherein the composition and temperature of the molten iron and scrap steel mixed sample are calculated before each step.
3. The method for calculating the oxygen supply curve in the steelmaking process of the converter in stages as claimed in claim 1, wherein the whole smelting stage is divided into a plurality of stages at intervals of 1-3 minutes.
4. The method for calculating the oxygen supply curve in the converter steelmaking process in stages as claimed in claim 1, wherein the total oxygen consumption mass of carbon element for generating carbon monoxide by reaction and the total oxygen consumption mass of carbon element for generating carbon dioxide are calculated according to the ratio of carbon element for generating carbon monoxide or carbon dioxide.
5. The method for calculating the oxygen supply curve in the converter steelmaking process in stages as claimed in claim 1, wherein the total oxygen consumption mass of sulfur element to generate sulfur dioxide and the total oxygen consumption mass of sulfur element to generate calcium sulfide are calculated according to the proportion of sulfur element to generate sulfur dioxide or CaS.
6. The method for calculating the oxygen supply curve in the converter steelmaking process in stages as claimed in claim 1, wherein the oxygen supply curve is calculated according to the FeO content in the slag and the Fe content in the slag2O3The oxygen consumption of the iron element oxidized into ferrous oxide and the oxygen consumption of the iron element oxidized into ferric oxide are calculated.
7. The method for calculating the oxygen supply curve in the converter steelmaking process in stages as claimed in claim 1, wherein the oxygen consumption of each auxiliary material includes the oxygen consumption of lime, pellet, white magnesium ball, fluorite and dolomite.
8. The method of claim 1, wherein the total mass of molten steel is calculated by subtracting the loss of each stage from the total mass of molten steel added as received and adding the mass of iron carried in the ore.
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