CN101250606A - Method for reducing dust of steel mill by using CO2 - Google Patents
Method for reducing dust of steel mill by using CO2 Download PDFInfo
- Publication number
- CN101250606A CN101250606A CNA2008101041272A CN200810104127A CN101250606A CN 101250606 A CN101250606 A CN 101250606A CN A2008101041272 A CNA2008101041272 A CN A2008101041272A CN 200810104127 A CN200810104127 A CN 200810104127A CN 101250606 A CN101250606 A CN 101250606A
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- iron
- oxygen
- carbonic acid
- gas
- acid gas
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- 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
- Y02P10/20—Recycling
Abstract
The invention belongs to the ferrous metallurgy and environmental protection field, relating to a treatment for offscum, which comprises a converter steelmaking and electric furnace steelmaking technology. The traditional treatment process in current offscum is recycled after dust removal and dust collection, which is a post treatment process. The invention aims to provide a novel process which can reduce dust generation in steelmaking process, and reduces the burning loss of iron and other melt elements in the smelting process. The process comprises mixing a little amount of CO2 gas into oxygen jet flow, reducing the temperature of the flash points region of a molten pool when the mixed gas jet flow is sprayed on the molten pool, controlling the evaporation of iron when the temperature of flash points region is decreased under 2750 DEG C, and reducing dust discharge in steelmaking smelting process, wherein the CO2 content in the mixed gas is controlled within 1-9%, and the content of oxygen is 99-91%. The process is suitable to the technology for the converter steelmaking of 30-300 ton and electric furnace steelmaking of 30-200 ton. The evaporation amount of iron is reduced about 30-70% through adopting the process, and the iron loss which is caused by dust is reduced 5-10kg/t.
Description
Technical field
The invention belongs to energy-saving and emission-reduction, the field of environment protection of ferrous metallurgy, the flue dust that relates generally to the STEELMAKING PRODUCTION process produces and discharging.
Background technology
Steelmaking process adopts oxygen to finish decarburization, dephosphorisation reaction as oxygenant usually, realizes tasks such as molten bath intensification and removal are mingled with.Because oxygen jet directly contacts the molten bath, produce the high temperature fire point zone more than 3000 ℃.And the boiling point of metallic iron is 2750 ℃, so iron forms evaporation oxidation flue dust and discharges with high-temperature flue gas.In the STEELMAKING PRODUCTION process, each ton steel will produce the fume amount of 1-2% at present, about 10-20kg.The increase of fume amount has not only reduced recovery rate of iron but also has increased the load of dust remove of steel-making.
Summary of the invention
The objective of the invention is to adopt a kind of method that can reduce the fume from steel making generation, promptly reduce the evaporation scaling loss of smelting process metallic iron and other metallic elements, reach the minimizing soot emissions.
Though the reaction of carbonic acid gas and iron, carbon is oxidizing reaction but thermo-negative reaction.In the converting process, oxygen jet fire point district localized hyperthermia is the major cause that flue dust produces.The present invention amounts of carbon dioxide CO
2Gas is blended in the oxygen jet, when the mixed gas jet is ejected into the molten bath, the temperature that has reduced molten bath " fire point district " (is the zone that gas directly contacts with molten steel, this zone account for the molten bath about 4%), when fire point district temperature is reduced to below 2750 ℃, the evaporation of iron will be controlled, and soot emissions will reduce in the steel-making smelting process.
A kind of CO that utilizes
2Gas reduces the method that fume from steel making produces, after it is characterized in that amounts of carbon dioxide carried out uniform mixing by a mixing device and oxygen, guarantee in oxygen and the carbon dioxide gas mixture by regulation system, the content of carbonic acid gas is controlled at below 9%, the content of oxygen is more than 91%, i.e. steel-making blowing adopts the oxygen of 1-9% carbonic acid gas and 99-91% to carry out oxidation operation.
The present invention is in section different tap to tap time of steelmaking process, adopts the mode of segmentation control carbonic acid gas and oxygen proportion, controls the generation of flue dust.Promptly smelt first period interior (as in 0-5min) of beginning, the oxygen mix winding-up of 4-7% carbonic acid gas and 96-93%.At this moment because the oxidizing reaction of carbon is not also carried out by Temperature Influence fully, and the oxidation of iron is serious, the ratio that improves carbonic acid gas will be controlled the evaporation oxidation of iron.Second period of smelting (as smelting in the 5-9min), 1-2% carbonic acid gas and the winding-up of 99-98% oxygen mix; At this moment the oxidation of carbon begins fierceness and carries out, can control the part evaporation of iron, at this moment suitably reduce the ratio of carbonic acid gas, guarantee that liquid steel temperature reaches metallurgical requirement, the 3rd period (in 9-13min) of smelting, 5-9% carbonic acid gas and the winding-up of 95-91% oxygen mix, the restriction of the concentration of carbon in the steel is received in the oxidation of carbon at this moment, the evaporation oxidation aggravation of iron, the ratio that improves carbonic acid gas can be controlled the velocity of evaporation of iron.
The jet concrete division of period of oxygen and carbon dioxide gas mixture of the present invention will be determined by the speed of response of smelting process decarburization.
The present invention is applicable to converter steelmaking of 30-300 ton and 30-200 ton arc furnace steeling process.Adopt the present invention, the steam output of iron reduces about 30-70%, and the iron loss that flue dust causes reduces 5-10kg/t.
Embodiment
(1) 100 ton of converter smelting process installs the CO that adopts 1-5% with carbonic acid gas and oxygen through one
2Mix in the oxygen and jet, smelt (first period): CO in the beginning 0-5min
2-O
2CO in the mixed gas
2Concentration is 4%, O
2Concentration is 96%, according to the situation of in-furnace slag, and decision CO
2The winding-up time.Mixed gas flow adopts 18000-20000Nm
3/ h, pressure are 0.6-1.0Mpa.
The decarburization stage (second period): 5-9 minute, after change slag task is finished, CO
2-O
2CO in the mixed gas
2Concentration is 1%, O
2Concentration is 99%, and mixed gas flow is 20000-23000Nm
3/ h is according to the carbon content decision decarburization time in molten bath in the stove.
Temperature rise period (the 3rd period): behind the 9-13min, 7% carbonic acid gas and the winding-up of 93% oxygen mix, mixed gas flow is 23000-25000Nm
3/ h, according to the oxidation and the intensification situation of carbon in the stove,, reach the temperature and the steel grades of tapping.
(2) 70 tons of electric arc furnace smelting technologies: adopt CO
2-O
2Mixed injection utilizes 1-6 to prop up spray gun.The scrap melting stage (first period): CO
2-O
2CO in the mixed gas
2Concentration is 1%, O
2Concentration is 99%.According to scrap melting situation in the stove, decision CO
2-O
2The winding-up time.Mixed gas flow adopts 3000Nm
3/ h, pressure are 0.6-1.2Mpa.
The dephosphorization under oxidizing atmosphere stage (second period): CO
2-O
2CO in the mixed gas
2Concentration is 4%, O
2Concentration is 96%, and mixed gas flow is 4000Nm
3/ h is according to the phosphorus content decision dephosphorization time in molten bath in the stove.
The oxidation and decarbonization stage (the 3rd period): CO
2-O
2CO in the mixed gas
2Concentration is 8%, O
2Concentration is 92%, and mixed gas flow is 5000Nm
3/ h is according to the carbon content decision decarburization time in molten bath in the stove.Finally reach the temperature and the steel grades of tapping.
Claims (2)
1. one kind is utilized CO
2Gas reduces the method that fume from steel making produces, after it is characterized in that amounts of carbon dioxide carried out uniform mixing by a mixing device and oxygen, guarantee in the mixed gas by regulation system, the content of carbonic acid gas is controlled at 1-9%, the content of oxygen is at 99-91%, i.e. steel-making blowing adopts the oxygen of 1-9% carbonic acid gas and 99-91% to carry out oxidation operation; Be blended in the oxygen jet with a small amount of CO2 gas, when the mixed gas jet is ejected into the molten bath, reduced the temperature in molten bath " fire point district ", it is the zone that gas directly contacts with molten steel, this zone accounts for 4% of molten bath, when fire point district temperature is reduced to below 2750 ℃, the evaporation of iron will be controlled, and soot emissions will reduce in the steel-making smelting process.
2. the CO that utilizes as claimed in claim 1
2Gas reduces the method that fume from steel making produces, it is characterized in that: in section different tap to tap time of steelmaking process, adopt the mode of segmentation control carbonic acid gas and oxygen proportion, the generation of control flue dust, first period of smelting, promptly in 0-5min, adopt the oxygen mix winding-up of 4-7% carbonic acid gas and 96-93%; At this moment because the oxidizing reaction of carbon is not also carried out by Temperature Influence fully, and the oxidation of iron is serious, the ratio that improves carbonic acid gas will be controlled the evaporation oxidation of iron; Second period of smelting, promptly smelt in the 5-9min, adopt the winding-up of 1-2% carbonic acid gas and 99-98% oxygen mix; At this moment the oxidation of carbon begins fierceness and carries out, and can control the part evaporation of iron, at this moment suitably reduces the ratio of carbonic acid gas, guarantees that liquid steel temperature reaches metallurgical requirement; The 3rd period of smelting, promptly in 9-13min, adopt the winding-up of 5-9% carbonic acid gas and 95-91% oxygen mix, the oxidation of carbon at this moment is subjected to the restriction of the concentration of carbon in the steel, the evaporation oxidation aggravation of iron, the ratio that improves carbonic acid gas can be controlled the velocity of evaporation of iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008101041272A CN100560740C (en) | 2008-04-16 | 2008-04-16 | A kind of CO that utilizes 2Gas reduces the method that fume from steel making produces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008101041272A CN100560740C (en) | 2008-04-16 | 2008-04-16 | A kind of CO that utilizes 2Gas reduces the method that fume from steel making produces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101250606A true CN101250606A (en) | 2008-08-27 |
| CN100560740C CN100560740C (en) | 2009-11-18 |
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ID=39954205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2008101041272A Active CN100560740C (en) | 2008-04-16 | 2008-04-16 | A kind of CO that utilizes 2Gas reduces the method that fume from steel making produces |
Country Status (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146491B (en) * | 2010-02-05 | 2014-01-01 | 鞍钢股份有限公司 | Method for smelting clean steel by supplementation and decarburization with CO2 at end of converter blowing |
| CN108330242A (en) * | 2018-02-08 | 2018-07-27 | 北京科技大学 | It is a kind of to utilize CO2The areas pneumatic steelmaking Huo Dian are inhibited to inhale the method for nitrogen |
| CN108796163A (en) * | 2018-06-13 | 2018-11-13 | 北京科技大学 | It is a kind of to utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point |
| CN110628983A (en) * | 2019-10-10 | 2019-12-31 | 北京科技大学 | Converter smelting fire point area temperature continuous monitoring oxygen lance system and monitoring method |
| 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 |
-
2008
- 2008-04-16 CN CNB2008101041272A patent/CN100560740C/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146491B (en) * | 2010-02-05 | 2014-01-01 | 鞍钢股份有限公司 | Method for smelting clean steel by supplementation and decarburization with CO2 at end of converter blowing |
| CN108330242A (en) * | 2018-02-08 | 2018-07-27 | 北京科技大学 | It is a kind of to utilize CO2The areas pneumatic steelmaking Huo Dian are inhibited to inhale the method for nitrogen |
| CN108796163A (en) * | 2018-06-13 | 2018-11-13 | 北京科技大学 | It is a kind of to utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point |
| CN110628983A (en) * | 2019-10-10 | 2019-12-31 | 北京科技大学 | Converter smelting fire point area temperature continuous monitoring oxygen lance system and monitoring method |
| 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 |
| WO2021073015A1 (en) * | 2019-10-16 | 2021-04-22 | 北京科技大学 | Converter co2-o2 mixed injection smelting method and dynamic temperature control method in fire-point region |
| US11788160B2 (en) | 2019-10-16 | 2023-10-17 | University Of Science And Technology Beijing | Converter CO2—O2 mixed injection smelting method and method of dynamically controlling fire point area temperature |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100560740C (en) | 2009-11-18 |
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