CN115747404A - Cold material adding method in converter process - Google Patents
Cold material adding method in converter process Download PDFInfo
- Publication number
- CN115747404A CN115747404A CN202211386637.XA CN202211386637A CN115747404A CN 115747404 A CN115747404 A CN 115747404A CN 202211386637 A CN202211386637 A CN 202211386637A CN 115747404 A CN115747404 A CN 115747404A
- Authority
- CN
- China
- Prior art keywords
- cold
- molten pool
- speed
- temperature
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 63
- 230000008569 process Effects 0.000 title claims abstract description 47
- 239000000463 material Substances 0.000 title claims abstract description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 42
- 239000001301 oxygen Substances 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 238000007664 blowing Methods 0.000 claims abstract description 29
- 230000000694 effects Effects 0.000 claims abstract description 27
- 230000008859 change Effects 0.000 claims abstract description 18
- 238000005261 decarburization Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 238000005262 decarbonization Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052742 iron Inorganic materials 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000007769 metal material Substances 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 5
- 230000004927 fusion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a cold charge adding method in a converter process, and belongs to the technical field of metal material smelting. The technical scheme of the invention is as follows: in the decarburization heating-up stage in the converter blowing process, the current heating-up speed of a molten pool is obtained through calculation according to the actual oxygen supply amount; calculating the cooling effect of the cold material in unit weight through a cold material cooling mechanism; calculating the adding speed of the cold material according to the cooling effect of the cold material in unit weight and the temperature change condition of a molten pool required by the process; feeding at constant speed by a continuous feeding cold material device. The beneficial effects of the invention are: the cold charge adding speed in the blowing process is dynamically adjusted along with the process, and the technical bottleneck problems of splashing and the like caused by cold charge addition in the existing converter blowing process, particularly in the middle and later blowing stages in iron and steel enterprises can be effectively solved.
Description
Technical Field
The invention relates to a cold charge adding method in a converter process, and belongs to the technical field of metal material smelting.
Background
In the converter steelmaking process, the temperature of a molten pool is very important to the blowing stability. When the temperature of the molten pool rises to above 1400 ℃, the molten pool reacts violently, and the temperature change of the molten pool caused by adding cold materials can cause splashing, thereby causing great influence on the production of the converter.
In order to improve this problem, batch feeding, low-temperature zone pre-feeding, and the like are generally used. The effect is not ideal due to the factors of the change of the oxygen supply intensity, the change of the total amount of the feeding materials and the like.
Disclosure of Invention
The invention aims to provide a cold charge adding method in the converter process, which is characterized in that cold charge is added through a continuous charging device, a dynamic cold charge adding mode is determined according to the oxygen supply intensity, the requirement of the temperature change trend of a molten pool and other process requirements through thermodynamic calculation, reasonable molten pool temperature control in the cold charge adding process is realized, the temperature change of the molten pool is ensured to meet the process design requirements under different oxygen supply intensity conditions, the cold charge adding speed in the converting process is dynamically adjusted along with the process, and the problems in the background art are effectively solved.
The technical scheme of the invention is as follows: a cold charge adding method for a converter process comprises the following steps: in the decarburization heating-up stage in the converter blowing process, the current heating-up speed of a molten pool is obtained through calculation according to the actual oxygen supply amount; calculating the cooling effect of the cold material in unit weight through a cold material cooling mechanism; calculating the adding speed of the cold charge according to the cooling effect of the cold charge in unit weight and the temperature change condition of a molten pool required by the process; the constant-speed feeding of the continuous feeding cold material device can realize that the temperature of a molten pool is kept unchanged, reduced at a certain speed and increased at a certain speed in the oxygen blowing process.
The temperature of the molten pool is more than 1400 ℃, and the carbon content of the molten pool is more than 0.8 percent.
The method for calculating the current temperature rise speed of the molten pool comprises the following steps
(1) Thermal effect of the reaction of formula Δ H = a kJ/kg
(2) Thermal effect of the reaction of formula Δ H = b kJ/kg
Hot melting of molten steel = c kJ/kg. K
Heating oxygen decarburization molten steel every minute:
△T1=（A×B/（16/12）×（1-C）×a+ A×B/（32/12）×C×b）/c×D/1000
a oxygen blowing intensity (m 3/min. T)
B oxygen density 1.43 (kg/m 3)
C is the proportion of secondary combustion%
D, the proportion of heat for heating the molten pool%
a: thermal effect kJ/kg of carbon oxidation to CO
b: oxidation of carbon to CO 2 Thermal effect kJ/kg
c: and (5) hot melting kJ/kg of molten steel.
The cooling mechanism of the cold charge is delta T2= T1-T2
T1, cold material reduction and melting cooling
T2: the oxygen in the cold charge reacts with the carbon and the temperature rises.
The cooling effect of the cooling material per unit weight is delta T =deltaT 1-delta T3
And delta T3 is the temperature change condition of the molten pool required by the process.
Adding speed of cold burden:
V=△T/△T2×10（kg/t）
v, adding speed (kg/t) of cold materials.
The invention has the beneficial effects that: cold burden is added through a continuous feeding device, a dynamic cold burden adding mode is determined according to the oxygen supply intensity, the requirements of the change trend of the temperature of a molten pool and other process requirements through thermodynamic calculation, reasonable molten pool temperature control in the cold burden adding process is achieved, the temperature change of the molten pool is guaranteed to meet the process design requirements under the condition of different oxygen supply intensities, the cold burden adding speed in the converting process is dynamically adjusted along with the process, and the technical bottleneck problems of splashing and the like caused by the cold burden adding in the converting process of the existing converter in an iron and steel enterprise, particularly in the middle and later stages of converting, can be effectively solved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail and fully below with reference to the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
A cold charge adding method for a converter process comprises the following steps: in the decarburization heating stage in the converter blowing process, the current heating speed of the molten pool is obtained by calculation according to the actual oxygen supply amount; calculating the cooling effect of the cold material in unit weight through a cold material cooling mechanism; calculating the adding speed of the cold charge according to the cooling effect of the cold charge in unit weight and the temperature change condition of a molten pool required by the process; the constant-speed feeding of the continuous feeding cold material device can realize that the temperature of a molten pool is kept unchanged, reduced at a certain speed and increased at a certain speed in the oxygen blowing process.
The temperature of the molten pool is more than 1400 ℃, and the carbon content of the molten pool is more than 0.8 percent.
The method for calculating the current temperature rise speed of the molten pool comprises
(1) Thermal effect of the reaction of formula Δ H = a kJ/kg
(2) Thermal effect of the reaction of formula Δ H = b kJ/kg
Hot melting of molten steel = c kJ/kg. K
Heating oxygen decarburization molten steel every minute:
△T1=（A×B/（16/12）×（1-C）×a+ A×B/（32/12）×C×b）/c×D/1000
a oxygen blowing intensity (m 3/min. T)
B oxygen density 1.43 (kg/m 3)
C is the proportion of secondary combustion%
D, the proportion of heat for heating the molten pool%
a: thermal effect kJ/kg of carbon oxidation to CO
b: oxidation of carbon to CO 2 Thermal effect kJ/kg
c: and hot melting the molten steel kJ/kg.
The cooling mechanism of the cold charge is delta T2= T1-T2
T1, cold material reduction and melting temperature reduction
T2: the oxygen in the cold charge reacts with the carbon and the temperature rises.
The cooling effect of the cooling material per unit weight is delta T =deltaT 1-delta T3
And delta T3 is the temperature change condition of the molten pool required by the process.
The adding speed of the cold materials is as follows:
V=△T/△T2×10（kg/t）
v, adding speed (kg/t) of cold materials.
The temperature change requirement of a molten pool is confirmed according to the process requirements such as a converting interval and the like, and the common requirements are constant temperature, uniform speed reduction and uniform speed increase. And calculating the temperature rise of the molten pool in unit time according to the oxygen blowing intensity. And calculating the cooling value of the ore in unit weight according to the components of the ore. And obtaining the cold charge adding amount in unit time, namely the cold charge adding speed according to the calculation result.
The method comprises the following specific steps:
step 1:
according to the process requirements of converting interval and the like, the temperature change requirement of a molten pool, TC (DEG C/min) is confirmed
And 2, step:
and calculating the temperature rise of the molten pool in unit time according to the oxygen blowing intensity.
The formula of decarburization reaction:
[C]+1/2{ O 2 }={CO}↑（1）
[C] + { O 2 } = {CO 2 }↑（2）
(1) Thermal effect of the reaction of formula Δ H = a kJ/kg
(2) Thermal effect of the reaction of formula Δ H = b kJ/kg
Hot melting of molten steel = c kJ/kg. K
Heating oxygen decarburization molten steel every minute:
△T1=（A×B/（16/12）×（1-C）×a+ A×B/（32/12）×C×b）/c×D/1000
a oxygen blowing intensity (m 3/min. T)
B oxygen density 1.43 (kg/m 3)
C is the proportion of secondary combustion%
D, the proportion of heat for heating the molten pool%
And step 3:
and calculating the cooling temperature value of 10kg/t of cold charge according to the components of 10kg/t of cold charge.
The cold charge reduction reaction formula:
2[Fe]+3/2{ O 2 }=(Fe 2 O 3 ) (3)
(3) Thermal effect of the reaction of formula Δ H = d kJ/kg
Latent heat of cold charge fusion = e kJ/kg
Cooling the cold material:
T1=（209+6460×f）/c×10/1000
heating ore oxygen:
T2=（10×f×（112/48）/（16/12）×（1-C）×a+ A×B/（32/12）×C×b）/c×D/1000000
f is the iron content of the ore%
The temperature of the cold charge is reduced by 10kg/t per minute.
△T2= T1- T2
And 4, step 4:
and calculating the ore feeding speed.
Influence of ore on molten pool temperature change per minute
△T=△T1-△T3
And the delta T3 is the set requirement of the temperature change of the molten pool.
Ore addition rate:
V=△T/△T2×10（kg/t）
v ore addition rate (kg/t)
The invention is further illustrated by the following examples:
example 1:
100 tons of converter, the oxygen blowing percentage is 40 percent, the oxygen blowing intensity is 3.6 m3/min.t, and the temperature is constant in the process of adding cold materials. The iron content of the cold charge is 65 percent.
Oxygen blowing decarburization is carried out, the temperature is raised by 39.3 ℃/min, and 10kg of cold burden is cooled by 28.7 ℃.
The required cooling speed of the molten pool is 39.3-0=39.9 ℃/min.
The ore feeding speed V =39.3/28.7 × 10=13.68 kg/t.min, i.e. 1368 kg/min.
Example 2:
100 tons of converter, the oxygen blowing percentage is 40 percent, the oxygen blowing intensity is 3.0 m3/min.t, and the temperature is constant in the process of adding cold charge. The iron content of the cold charge is 65 percent.
Oxygen blowing decarburization, temperature rising and 10kg cold charge cooling are carried out at the temperature of 32.7 ℃/min and 28.7 ℃.
The required cooling speed of the molten pool is 32.7-0=32.7 ℃/min.
The ore feeding speed V =32.7/28.7 × 10=11.04 kg/t.min, i.e. 1104 kg/min.
Example 3:
the oxygen blowing percentage of the 100 ton converter is 60 percent, the oxygen blowing intensity is 3.6 m3/min.t, and the temperature is required to be reduced by 5 ℃/min at a constant speed in the process of adding cold materials. The iron content of the cold charge is 62 percent.
Oxygen blowing decarburization is carried out, the temperature is raised by 39.3 ℃/min, and the temperature of 10kg of cold burden is lowered by 27.4 ℃.
The required cooling speed of the molten pool is 39.3- (-5) =44.3 ℃/min.
The ore feeding speed V = 44.3/27.4X 10=16.18kg/t.min, namely 1618kg/min.
Example 4:
100 tons of converter, the oxygen blowing percentage is 80 percent, the oxygen blowing intensity is 3.6 m3/min.t, and the process requires that the temperature is uniformly increased by 20 ℃/min in the process of adding cold materials. The iron content of the cold charge is 68 percent.
Oxygen blowing decarburization is carried out, the temperature is raised by 39.3 ℃/min, and 10kg of cold burden is cooled by 30.0 ℃.
The required cooling speed of the molten pool is 39.3- (20) =19.3 ℃/min.
The ore feeding speed V =19.3/30.0 × 10=6.42kg/t.min, i.e. 642kg/min.
The foregoing description of the disclosed embodiments will enable those skilled in the art to make or use the invention, and it will be apparent to those skilled in the art that various modifications to these embodiments may be made, and the general principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention, and the invention is therefore not to be limited to the embodiments illustrated herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A cold charge adding method in a converter process is characterized by comprising the following steps: in the decarburization heating stage in the converter blowing process, the current heating speed of the molten pool is obtained by calculation according to the actual oxygen supply amount; calculating the cooling effect of the cold material in unit weight through a cold material cooling mechanism; calculating the adding speed of the cold material according to the cooling effect of the cold material in unit weight and the temperature change condition of a molten pool required by the process; the temperature of a molten pool is kept unchanged, reduced or increased in the oxygen blowing process by feeding materials at a constant speed through the continuous feeding cold material device.
2. The converter process cold charge addition method according to claim 1, characterized in that: the temperature of the molten pool is more than 1400 ℃, and the carbon content of the molten pool is more than 0.8 percent.
3. The converter process cold charge addition method according to claim 1, characterized in that: the method for calculating the current temperature rise speed of the molten pool comprises the following steps:
decarburization reaction C +1/2O 2 = CO ═ c, reaction thermal effect Δ H = a kJ/kg;
decarbonization reaction C]+ O 2 = CO 2 ℃,. DELTA.H reaction thermal effect = b kJ/kg;
hot melting of molten steel = c kJ/kg. K
Heating oxygen decarburization molten steel every minute:
△T1=（A×B/（16/12）×（1-C）×a+ A×B/（32/12）×C×b）/c×D/1000
a oxygen blowing intensity (m 3/min.t)
B oxygen density 1.43 (kg/m 3)
C is the proportion of secondary combustion%
D, the proportion of heat for heating the molten pool%
a: thermal effect kJ/kg of carbon oxidation to CO
b: oxidation of carbon to CO 2 Thermal effect kJ/kg
c: and (5) hot melting kJ/kg of molten steel.
4. The method for adding cold burden in converter process according to claim 1, characterized in that: the cooling mechanism of the cold charge is delta T2= T1-T2
T1, cold material reduction and melting temperature reduction
T2: the oxygen in the cold charge reacts with the carbon and the temperature rises.
5. The method for adding cold burden in converter process according to claim 1, characterized in that: the cooling effect of the cooling material per unit weight is delta T =deltaT 1-delta T3
Delta T3 is the temperature change condition of the molten pool required by the process;
the adding speed of the cold materials is as follows:
V=△T/△T2×10（kg/t）
v, adding speed (kg/t) of cold materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211386637.XA CN115747404A (en) | 2022-11-07 | 2022-11-07 | Cold material adding method in converter process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211386637.XA CN115747404A (en) | 2022-11-07 | 2022-11-07 | Cold material adding method in converter process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115747404A true CN115747404A (en) | 2023-03-07 |
Family
ID=85357341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211386637.XA Pending CN115747404A (en) | 2022-11-07 | 2022-11-07 | Cold material adding method in converter process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115747404A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09157765A (en) * | 1995-12-01 | 1997-06-17 | Nkk Corp | Smelting reduction method of chromium ore |
| CN105132611A (en) * | 2015-09-29 | 2015-12-09 | 山东钢铁股份有限公司 | Method for producing ultra-low phosphorous steel through single slag of converter |
| CN107299182A (en) * | 2017-07-17 | 2017-10-27 | 唐山不锈钢有限责任公司 | A kind of method that converter utilizes scrap smelting half steel |
| CN107858475A (en) * | 2017-10-20 | 2018-03-30 | 河钢股份有限公司承德分公司 | A kind of method that converter extracting vanadium terminal is precisely controlled |
| CN110042188A (en) * | 2019-04-30 | 2019-07-23 | 马鞍山钢铁股份有限公司 | A method of bessemerizing outlet temperature compensation |
| CN110804684A (en) * | 2019-10-16 | 2020-02-18 | 北京科技大学 | CO converter2-O2Dynamic control method for temperature of mixed blowing smelting fire point area |
| CN115109894A (en) * | 2022-06-13 | 2022-09-27 | 山西太钢不锈钢股份有限公司 | Method for controlling splashing during desiliconization period of smelting stainless steel |
-
2022
- 2022-11-07 CN CN202211386637.XA patent/CN115747404A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09157765A (en) * | 1995-12-01 | 1997-06-17 | Nkk Corp | Smelting reduction method of chromium ore |
| CN105132611A (en) * | 2015-09-29 | 2015-12-09 | 山东钢铁股份有限公司 | Method for producing ultra-low phosphorous steel through single slag of converter |
| CN107299182A (en) * | 2017-07-17 | 2017-10-27 | 唐山不锈钢有限责任公司 | A kind of method that converter utilizes scrap smelting half steel |
| CN107858475A (en) * | 2017-10-20 | 2018-03-30 | 河钢股份有限公司承德分公司 | A kind of method that converter extracting vanadium terminal is precisely controlled |
| CN110042188A (en) * | 2019-04-30 | 2019-07-23 | 马鞍山钢铁股份有限公司 | A method of bessemerizing outlet temperature compensation |
| CN110804684A (en) * | 2019-10-16 | 2020-02-18 | 北京科技大学 | CO converter2-O2Dynamic control method for temperature of mixed blowing smelting fire point area |
| CN115109894A (en) * | 2022-06-13 | 2022-09-27 | 山西太钢不锈钢股份有限公司 | Method for controlling splashing during desiliconization period of smelting stainless steel |
Non-Patent Citations (2)
| Title |
|---|
| 杨文远, 郑丛杰, 崔健, 许春雷, 蒋晓放: "大型转炉吹炼过程中熔池温度的变化状况", 钢铁研究学报, no. 04 * |
| 杨毓和, 杨小琴: "云冶转炉富氧吹炼初步实践", 有色冶炼, no. 05 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110129517B (en) | Method for smelting high-silicon iron water based on converter duplex method to improve dephosphorization rate of desiliconization furnace | |
| CN101962714B (en) | Production method of low-silicon low-titanium and high-carbon ferrochrome smelted by submerged arc furnace | |
| CN115747404A (en) | Cold material adding method in converter process | |
| CN114875211B (en) | Method for smelting stainless steel and efficiently desilicating | |
| CN103205522A (en) | Method for smelting plain carbon steel from semi-steel | |
| CN111733355B (en) | Method for producing low-nitrogen medium-low micro-carbon ferrochrome by refining electric furnace | |
| US4001009A (en) | Process for the manufacture of steels with a high chromium content | |
| US1939874A (en) | Method for the production of steel | |
| CN112813221B (en) | Method for extracting vanadium from high-silicon vanadium-containing molten iron by converter | |
| CN112481439B (en) | Smelting process of converter low-phosphorus steel | |
| CN115261552A (en) | Method for extracting vanadium from high-temperature molten iron by converter | |
| CN114990279A (en) | Method for reducing iron-steel ratio under limit heat balance | |
| CN115537491B (en) | Converter converting method of low-temperature low-silicon molten iron | |
| CN115418434B (en) | Production method of low-phosphorus molten iron for carburetion | |
| CN109609719B (en) | Method for extracting vanadium by binary gas supply converter | |
| CN115096071B (en) | Method for reducing consumption of steel-making lime of electric arc furnace by recycling tailings | |
| JPH0421727B2 (en) | ||
| JPH01252715A (en) | Method for operating iron bath type smelting reduction furnace | |
| CN116926260A (en) | Temperature control method for converter steelmaking process | |
| JPH0826378B2 (en) | Method for producing molten iron containing chromium | |
| CN115449594A (en) | Stainless steel smelting method using high chromium to replace low chromium | |
| CN116334336A (en) | Method for producing chromium-containing molten iron | |
| CN114790503A (en) | Smelting method by adding iron ore | |
| CN113201622A (en) | Method for smelting high-quality carbon steel by 120t converter | |
| CN113293254A (en) | High-efficiency utilization process of high-grade iron-containing raw material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |