CN113076505B - Converter molten steel decarburization rate calculation method - Google Patents
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 46
- 238000004364 calculation method Methods 0.000 title claims abstract description 46
- 239000010959 steel Substances 0.000 title claims abstract description 46
- 238000005261 decarburization Methods 0.000 title claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000001301 oxygen Substances 0.000 claims abstract description 108
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 108
- 239000000463 material Substances 0.000 claims abstract description 107
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000007664 blowing Methods 0.000 claims abstract description 28
- 230000010354 integration Effects 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 15
- 238000009825 accumulation Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000012821 model calculation Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention relates to a converter molten steel decarburization rate calculation method, which comprises the following steps: step 1: a carbon content calculation formula after carbon determination of the sublance; step 2: and (3) carrying out a correction formula by utilizing oxygen in the auxiliary material. The decarburization rate in the later stage of converter blowing (after measuring by a sublance) is divided into three stages I, II and III according to the oxygen blowing process, wherein the stages I and III are respectively exponential functions, the stage II is a straight line section, the carbon content is calculated in real time by an integration method, and when the carbon content is calculated in each stage, the oxygen contained in the added auxiliary material and the oxygen blowing amount of the oxygen lance are taken as a unified whole, a calculation formula is corrected, and the hit rate of the calculated carbon content is improved.
Description
Technical Field
The invention relates to a calculation method, in particular to a calculation method for decarburization rate of molten steel of a converter, and belongs to the technical field of automatic control.
Background
The key point of steel-making production is to control the carbon content of molten steel and the temperature of molten steel. For controlling the carbon content of molten steel, a method for predicting the carbon content of molten steel is adopted, and in the smelting stage after measuring by a sublance, a method for determining carbon content of molten steel by flue gas and a method for balancing materials are generally adopted for predicting the carbon content of molten steel, but the precision and the hit rate are not very high. The method for analyzing and determining carbon of converter steelmaking flue gas (application number: CN 201810372680.8) adopts analysis of flue gas components to determine carbon, the accuracy of carbon determination needs to be improved, and meanwhile, the method is deeply dependent on an exhaust gas component analyzer and an exhaust gas flow meter, so that a new scheme is urgently needed to solve the technical problems.
Disclosure of Invention
The invention provides a method for calculating decarburization rate of molten steel of a converter, aiming at the problems existing in the prior art, wherein the decarburization rate of the converter in the later blowing period (after measuring by a sublance) is divided into three stages of I, II and III according to the oxygen blowing process, wherein the I, III stage is an exponential function, the II stage is a straight line section, the carbon content is calculated in real time by an integration method, and when the carbon content is calculated in each stage, oxygen contained in the added auxiliary material and the oxygen blowing amount of an oxygen lance are taken as a unified whole, a calculation formula is corrected, and the hit rate of the calculated carbon content is improved.
In order to achieve the above object, the technical scheme of the invention is as follows, a method for calculating decarburization rate of molten steel in a converter, the method comprising the following steps:
step 1: a carbon content calculation formula after carbon determination of the sublance;
1) The method comprises 3 stages;
the first stage is an exponential function, and the calculation formula is as follows:
the II phase is approximate to a straight line, and the simplified calculation formula is as follows:
dc＝KO+B O1＜O≤O2 (2)
Stage III is an exponential function, and the calculation formula is as follows:
2) The integration method calculates the carbon content in real time, and the calculation formula is as follows:
C＝C Initial initiation -∫dcdo (4)
dc is the decarburization rate;
C is the carbon content of molten steel predicted in real time after the measurement of the sublance, and is the calculated carbon content after the measurement of the sublance;
Step 2: the correction formula (4) is performed using oxygen in the subsidiary material.
1) Oxygen amount in the subsidiary material is calculated
The oxygen in the formula (4) is the oxygen lance oxygen blowing amount. In actual production, a large amount of oxygen is contained in the auxiliary material added to the converter, and the oxygen in the auxiliary material also participates in the reaction. The subsidiary material here means a subsidiary material added after the measuring by the subsidiary gun, and oxygen content in the subsidiary material:
Wherein, K_O Auxiliary material is the oxygen coefficient of the oxygen content in the auxiliary material, and the specific value is shown in Table 1.
TABLE 1 oxygen coefficient of side Material
2) Specification and calculation method for oxygen release in auxiliary material
The oxygen in the auxiliary material is released at a certain rate until the release is completed.
ΔO Auxiliary material ＝V_O Auxiliary material ×Δt (6)
O Auxiliary material ＝O Auxiliary material -ΔO Auxiliary material (7)
Wherein V_O Auxiliary material is the release rate of oxygen in the auxiliary material, and the value is 5m 3/s; Δt is the period of model calculation, and is generally 2 seconds; Δo Auxiliary material is the amount of oxygen released per unit time Δt.
3) Correcting do;
the do in the formula (4) is deltao in the formula (8),
In the formula, O is the normalized oxygen blowing amount of each ton of molten steel, O Actual results is the accumulation of oxygen blowing amounts measured by the sublance, MSW is the calculated weight of molten steel,
A real-time carbon determination technology adopts a calculation method of a formula (4), adopts a fixed period method, and calculates the carbon content of molten steel in a timing and circulating way;
In the formula, O is the normalized oxygen blowing amount of each ton of molten steel, O Actual results is the accumulation of oxygen blowing amount measured by the sublance, MSW is the calculated molten steel weight, and dc is the decarburization rate.
C is the carbon content of the molten steel predicted in real time after the measurement of the sublance, and is the calculated carbon content after the measurement of the sublance.
O＝O Actual results /(MSW/1000)；
Wherein MSW is divided by 1000, and the weight unit of molten steel is changed from kilogram to ton;
Alpha, beta, gamma, O0, O1, O2 and K are related parameters, and the values are as follows:
Alpha is at (28.8, 31.5);
Beta at (7.32,7.53)
Gamma in (20.35, 23.56)
O0＝0；
O 1 at (4.94,5.21);
o 2 at (5.32,5.73);
K is (-1.76, -1.83).
Compared with the prior art, the method has the advantages that 1) the technical scheme uses the three-stage calculation method and the correction by utilizing oxygen in the auxiliary material, the auxiliary material contains a large amount of oxygen, the prior art calculates the real-time carbon content, and only takes the oxygen blowing amount of the oxygen lance as the sole oxygen source for decarburization without considering the oxygen in the auxiliary material. The sum of oxygen in the auxiliary material and oxygen blown by the oxygen gun is used as a source of decarburized oxygen, so that the accuracy of calculating the real-time carbon content is improved; 2) On the basis of measuring carbon determination in the middle of the sublance, the carbon determination of molten steel does not depend on an exhaust gas component analyzer and an exhaust gas flow meter, so that equipment investment is reduced; 3) The accuracy of carbon determination is greatly improved, and the hit rate of a carbon end point is improved by 5% through practical application of the plum steel; 4) The hit rate is improved by 3% within +/-5 ℃ based on the molten steel temperature prediction of the technology; 5) Because the end hit rate is improved, the blowing rate is reduced, the production cost is further reduced, and the labor intensity of converter production operators is also reduced.
Drawings
FIG. 1 is a graph showing decarburization rate as a function of oxygen blowing amount.
The specific embodiment is as follows:
In order to enhance the understanding of the present invention, the present embodiment will be described in detail with reference to the accompanying drawings.
Example 1: referring to fig. 1, a method for calculating decarburization rate of molten steel in a converter, the method comprising the steps of:
step 1: a carbon content calculation formula after carbon determination of the sublance;
1) The method comprises 3 stages;
the first stage is an exponential function, and the calculation formula is as follows:
The II stage is approximate to a straight line, and the simplified calculation formula is as follows:
dc＝KO+B O1＜O≤O2 (2)
The third stage is an exponential function, and the calculation formula is as follows:
2) The integration method calculates the carbon content in real time, and the calculation formula is as follows:
C＝C Initial initiation -∫dcdo (4)
Step 2: the correction formula (4) is performed using oxygen in the subsidiary material.
1) Oxygen amount in the subsidiary material is calculated
The oxygen in the formula (4) is the oxygen lance oxygen blowing amount. In actual production, a large amount of oxygen is contained in the auxiliary material added to the converter, and the oxygen in the auxiliary material also participates in the reaction. The subsidiary material here means a subsidiary material added after the measuring by the subsidiary gun, and oxygen content in the subsidiary material:
Wherein, K_O Auxiliary material is the oxygen coefficient of the oxygen content in the auxiliary material, and the specific value is shown in Table 1.
TABLE 1 oxygen coefficient of side Material
2) Specification and calculation method for oxygen release in auxiliary material
The oxygen in the auxiliary material is released at a certain rate until the release is completed.
ΔO Auxiliary material ＝V_O Auxiliary material ×Δt (6)
O Auxiliary material ＝O Auxiliary material -ΔO Auxiliary material (7)
Wherein V_O Auxiliary material is the release rate of oxygen in the auxiliary material, and the value is 5m 3/s; Δt is the period of model calculation, and is generally 2 seconds; Δo Auxiliary material is the amount of oxygen released per unit time Δt.
3) Correcting do;
the do in the formula (4) is Δo in the formula (8).
A real-time carbon determination technology adopts a calculation method of a formula (4), adopts a fixed period method, and calculates the carbon content of molten steel in a timing and circulating way;
In the formula, O is the normalized oxygen blowing amount of each ton of molten steel, O Actual results is the accumulation of oxygen blowing amount measured by the sublance, MSW is the calculated molten steel weight, and dc is the decarburization rate.
C is the carbon content of the molten steel predicted in real time after the measurement of the sublance, and is the calculated carbon content after the measurement of the sublance.
O＝O Actual results /(MSW/1000)；
Wherein MSW is divided by 1000, and the weight unit of molten steel is changed from kilogram to ton;
Alpha, beta, gamma, O0, O1, O2 and K are related parameters, and the values are as follows:
Alpha is at (28.8, 31.5);
Beta at (7.32,7.53)
Gamma in (20.35, 23.56)
O0＝0；
O 1 at (4.94,5.21);
o 2 at (5.32,5.73);
K is (-1.76, -1.83).
Application example 1: the invention provides a converter molten steel decarburization rate calculation method. The invention comprises three stages of I, II and III according to oxygen blowing process, wherein the I, III th stage is an exponential function and the II th stage is a straight line section.
Step 1: carbon content calculation formula after carbon determination of sublance
1) As shown in fig. 1, the phase i is an exponential function and the formula is calculated according to the 3 phases:
The II stage is approximate to a straight line, and the simplified calculation formula is as follows:
dc＝KO+B O1＜O≤O2 (2)
The third stage is an exponential function, and the calculation formula is as follows:
2) The integration method calculates the carbon content in real time, and the calculation formula is as follows:
C＝C Initial initiation -∫dcdo (4)
Step 2: correction formula (4) using oxygen in the auxiliary material
1) Oxygen amount in the subsidiary material is calculated
The oxygen in the formula (4) is the oxygen lance oxygen blowing amount. In actual production, a large amount of oxygen is contained in the auxiliary material added to the converter, and the oxygen in the auxiliary material also participates in the reaction. The auxiliary material herein means an auxiliary material added after the measurement by the sublance. Oxygen content in the auxiliary material:
Wherein, K_O Auxiliary material is the oxygen coefficient of the oxygen content in the auxiliary material, and the specific value is shown in Table 1.
TABLE 1 oxygen coefficient of side Material
2) Specification and calculation method for oxygen release in auxiliary material
The oxygen in the auxiliary material is released at a certain rate until the release is completed.
ΔO Auxiliary material ＝V_O Auxiliary material ×Δt (6)
O Auxiliary material ＝O Auxiliary material -ΔO Auxiliary material (7)
Wherein V_O Auxiliary material is the release rate of oxygen in the auxiliary material, and the value is 5m 3/s; Δt is the period of model calculation, and is generally 2 seconds; Δo Auxiliary material is the amount of oxygen released per unit time Δt.
3) Correction of do
The do in the formula (4) is Δo in the formula (8).
The real-time carbon determination technology adopts a calculation method of a formula (4), adopts a fixed period method, and calculates the carbon content of molten steel in a timing and circulating way.
In the formula, O is the normalized oxygen blowing amount of each ton of molten steel, O Actual results is the accumulation of oxygen blowing amount measured by the sublance, MSW is the calculated molten steel weight, and dc is the decarburization rate.
C is the carbon content of the molten steel predicted in real time after the measurement of the sublance, and is the calculated carbon content after the measurement of the sublance.
O＝O Actual results /(MSW/1000)
Where MSW is divided by 1000, the weight unit of molten steel is converted from kg to ton.
The values of the parameters are as follows:
α＝29.3，β＝7.42，γ＝21.94，00＝5.45，O1＝5.05,O2＝5.61，K＝-1.8。
application example 2:
This example is the case for use in Mei Gang steel making. The invention comprises three stages of I, II and III according to oxygen blowing process, wherein the I, III th stage is an exponential function and the II th stage is a straight line section.
Step 1: carbon content calculation formula after carbon determination of sublance
1) As shown in FIG. 1, in 3 stages
The I phase is an exponential function, and the calculation formula is as follows:
the II phase is approximate to a straight line, and the simplified calculation formula is as follows:
dc＝KO+B O1＜O≤O2 (2)
the III phase is an exponential function, and the calculation formula is as follows:
2) The integration method calculates the carbon content in real time, and the calculation formula is as follows:
C＝C Initial initiation -∫dcdo (4)
Step 2: correction formula (4) using oxygen in the auxiliary material
1) Oxygen amount in the subsidiary material is calculated
The oxygen in the formula (4) is the oxygen lance oxygen blowing amount. In actual production, a large amount of oxygen is contained in the auxiliary material added to the converter, and the oxygen in the auxiliary material also participates in the reaction. The auxiliary material herein means an auxiliary material added after the measurement by the sublance. Oxygen content in the auxiliary material:
Wherein, K_O Auxiliary material is the oxygen coefficient of the oxygen content in the auxiliary material, and the specific value is shown in Table 1.
TABLE 1 oxygen coefficient of side Material
2) Specification and calculation method for oxygen release in auxiliary material
The oxygen in the auxiliary material is released at a certain rate until the release is completed.
ΔO Auxiliary material ＝V_O Auxiliary material ×Δt (6)
O Auxiliary material ＝O Auxiliary material -ΔO Auxiliary material (7)
Wherein V_O Auxiliary material is the release rate of oxygen in the auxiliary material, and the value is 5m 3/s; Δt is the period of model calculation, and is generally 2 seconds; Δo Auxiliary material is the amount of oxygen released per unit time Δt.
3) Correction of do
The do in the formula (4) is Δo in the formula (8).
The real-time carbon determination technology adopts a calculation method of a formula (4), adopts a fixed period method, and calculates the carbon content of molten steel in a timing and circulating way.
In the formula, O is the normalized oxygen blowing amount of each ton of molten steel, O Actual results is the accumulation of oxygen blowing amount measured by the sublance, MSW is the calculated molten steel weight, and dc is the decarburization rate.
C is the carbon content of the molten steel predicted in real time after the measurement of the sublance, and is the calculated carbon content after the measurement of the sublance.
O＝O Actual results /(MSW/1000)
Where MSW is divided by 1000, the weight unit of molten steel is converted from kg to ton.
The values of the parameters are as follows:
α=29.4, β=7.40, γ=21.96, o 0＝5.47,O1＝5.02,O2 =5.631, k= -1.77. It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and equivalent changes or substitutions made on the basis of the above-mentioned technical solutions fall within the scope of the present invention as defined in the claims.
Claims (1)
1. A method for calculating decarburization rate of molten steel in a converter, comprising the steps of:
step 1: a carbon content calculation formula after carbon determination of the sublance;
step 2: using oxygen in the auxiliary material to carry out a correction formula;
wherein, step 1: the calculation formula of the carbon content after the carbon determination of the sublance is specifically as follows:
1) Decarburization Rate calculation in 3 stages
The first stage is an exponential function, and the calculation formula is as follows:
the II stage is approximate to a straight line, and the simplified calculation formula is as follows:
dc＝KO+B O1＜O≤O2 (2)
The third stage is an exponential function, and the calculation formula is as follows:
2) The carbon content is calculated in real time by an integration method, and the calculation formula is as follows:
C＝C Initial initiation -∫dcdo (4)；
dc is the decarburization rate;
C is the carbon content of molten steel predicted in real time after the measurement of the sublance, and C Initial initiation is the calculated carbon content after the measurement of the sublance;
wherein, step 2: the correction formula (4) is performed by using oxygen in the subsidiary material, and specifically is as follows:
1) Calculating the oxygen content in the auxiliary material;
oxygen in the formula (4) is oxygen lance oxygen blowing amount, and the auxiliary material is auxiliary material added after the measurement of the auxiliary lance, wherein the oxygen content in the auxiliary material is as follows:
Wherein, K_O Auxiliary material is the oxygen coefficient of the oxygen content in the auxiliary material, and the specific value is shown in Table 1;
TABLE 1 oxygen coefficient of side Material
2) Specification and calculation method of oxygen release in auxiliary materials;
The oxygen in the auxiliary material is released all the time at a certain speed until the release is finished;
ΔO Auxiliary material ＝V_O Auxiliary material ×Δt (6)
O Auxiliary material ＝O Auxiliary material -ΔO Auxiliary material (7)
Wherein V_O Auxiliary material is the release rate of oxygen in the auxiliary material, and the value is 5m 3/s; Δt is the period calculated by the model, and the value is 2 seconds; Δo Auxiliary material is the amount of oxygen released per unit time Δt;
3) Correcting do;
the do in the formula (4) is Δo in the formula (8);
a real-time carbon determination technology adopts a calculation method of a formula (4), adopts a fixed period method, and calculates the carbon content of molten steel in a timing and circulating way;
O＝O Actual results /(MSW/1000)；
in the formula, O is the normalized oxygen blowing amount of each ton of molten steel, O Actual results is the accumulation of oxygen blowing amounts measured by the sublance, MSW is the calculated weight of molten steel,
Wherein MSW is divided by 1000, and the weight unit of molten steel is changed from kilogram to ton;
Alpha, beta, gamma, O 0、O1、O2 and K are related parameters, and the values are as follows:
Alpha is at (28.8, 31.5);
Beta at (7.32,7.53)
Gamma in (20.35, 23.56)
O0＝0；
O 1 at (4.94,5.21);
o 2 at (5.32,5.73);
K is (-1.76, -1.83).
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