CN113817890B - Method for controlling dry dedusting explosion venting of converter - Google Patents
Method for controlling dry dedusting explosion venting of converter Download PDFInfo
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- CN113817890B CN113817890B CN202110967060.0A CN202110967060A CN113817890B CN 113817890 B CN113817890 B CN 113817890B CN 202110967060 A CN202110967060 A CN 202110967060A CN 113817890 B CN113817890 B CN 113817890B
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- oxygen
- equal
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- preset opening
- lance
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for controlling dry dedusting explosion venting of a converter, which comprises the following steps: adjusting a preset opening of an oxygen flow regulating valve before converting, keeping low flow 3 seconds before converting, wherein the upper limit of the preset opening is taken when the slag amount is large, the light thin steel scrap is more, the oxygen pressure is less than or equal to 1.8MPa, and the lower limit of the preset opening is taken when the slag amount is small, the light thin steel scrap is less, the oxygen pressure is more than or equal to 2.0MPa, and the middle and later converting periods are carried out; the furnace mouth keeps micro-positive pressure by adjusting the rotating speed of the fan; blowing by an oxygen lance when the oxygen content of a gas analyzer in the flue is more than or equal to 20 percent; in an automatic state, slowing down carbon-oxygen reaction, controlling the time of low flow, and when the oxygen content is reduced, adjusting the oxygen flow upwards; in an abnormal manual mode, blowing is started to blow at a low flow rate and a high lance position, when the oxygen content begins to decrease from 20%, the oxygen flow rate is adjusted upwards according to a CO curve, and the lance position of the oxygen lance is kept unchanged; and when the oxygen flow is adjusted upwards, feeding, wherein each batch is less than 1 ton, and when the oxygen flow is normal, feeding is carried out, and each batch is more than or equal to 1 ton.
Description
Technical Field
The invention belongs to the technical field of dry dedusting of converters, and particularly relates to a method for controlling dry dedusting explosion venting of a converter.
Background
The converter dry dedusting has the advantages of high dedusting efficiency, low cost and short investment recovery period, and gradually replaces a wet dedusting process with higher and higher environmental protection requirements, but the converter dry dedusting explosion venting problem is always a restriction factor and influences further popularization and application of the converter dry dedusting explosion venting problem, the normal production of the converter is influenced, and the large explosion venting has potential safety hazards. Therefore, how to stably control and avoid explosion venting to reach an explosion venting point CO: 9%, O2: 6 percent, becomes a key control link for stable and efficient production of the converter.
Disclosure of Invention
The invention aims to provide a method for controlling dry dedusting explosion venting of a converter.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for controlling dry dedusting explosion venting of a converter comprises the following steps:
1) adjusting a preset opening of an oxygen flow regulating valve before converting, keeping low flow 3 seconds before converting, wherein the preset opening is 32-42% according to the conditions of oxygen pressure, slag quantity, scrap steel and converting stages, when the slag quantity is large, the quantity of light and thin scrap steel is large, the oxygen pressure is less than or equal to 1.8MPa, the upper limit of the preset opening is taken at the early converting stage, and when the slag quantity is small, the quantity of light and thin scrap steel is small, the oxygen pressure is greater than or equal to 2.0MPa, and the lower limit of the preset opening is taken at the middle and later converting stages;
2) the furnace mouth keeps micro-positive pressure by adjusting the rotating speed of the fan;
3) blowing by an oxygen lance when the oxygen content of a gas analyzer in the flue is more than or equal to 20 percent;
4) in an automatic state, slowing down carbon-oxygen reaction, controlling the time of low flow, and when the oxygen content is reduced, adjusting the oxygen flow upwards;
5) in an abnormal manual mode, blowing is started to blow at a low flow rate and a high lance position, when the oxygen content begins to decrease from 20%, the oxygen flow rate is adjusted upwards according to a CO curve, and the lance position of the oxygen lance is kept unchanged;
6) and when the oxygen flow is adjusted upwards, feeding, wherein each batch is less than 1 ton, and when the oxygen flow is normal, feeding is carried out, and each batch is more than or equal to 1 ton.
The invention has the following beneficial effects: the method is simple to operate, can greatly reduce the explosion venting probability of the converter, and effectively realizes the stable operation of dry dedusting of the converter.
Detailed Description
The present invention will now be described in further detail.
A method for controlling dry dedusting explosion venting of a converter comprises the following steps:
1) the aperture is predetermine to oxygen flow control valve before the rifle converting well, predetermines the aperture adjustment and can make 3 seconds before the converting, keeps low flow (about 50% of normal flow), prevents to open to blow in the twinkling of an eye the flow great, causes to reach CO: 9%, O2: the method comprises the following steps of (1) presetting an opening degree between 32-42% at a 6% explosion relief point according to the conditions of oxygen pressure, slag quantity, scrap steel and converting stages, wherein the preset opening degree is large in slag quantity, large in light thin material of the scrap steel, low in oxygen pressure (below 1.8 MPa), and in the converting early stage (before 20% of oxygen consumption), the preset opening degree is limited to an upper limit, the preset opening degree is small in slag quantity, small in light thin material of the scrap steel, high in oxygen pressure (above 2.0 MPa), and in the converting middle and later stages (after 20% of oxygen consumption), the preset opening degree is limited to a lower limit.
2) The furnace mouth keeps micro-positive pressure by adjusting the rotating speed of the fan, so that air suction is avoided.
3) And (3) after the oxygen content of the gas analyzer in the flue is normal, O2: above 20%, the blowing can be carried out by blowing.
4) The control principle under the automatic state slows down the carbon-oxygen reaction, controls the time of low flow, and when the oxygen content descends, upwards adjusts the oxygen flow, avoids reaching the explosion venting point, and oxygen flow and gun position are controlled as follows.
5) In an abnormal manual mode, the lance position and the flow control principle blow low flow and high lance position (the flow is about 50% of normal and the lance position is about 2500 mm), when the oxygen content begins to drop from 20%, the oxygen flow is adjusted upwards by combining a CO curve, and the lance position of the oxygen lance is kept unchanged.
6) When the oxygen flow begins to be adjusted upwards, feeding can be carried out, each batch is less than 1 ton, the situation that feeding is too much and explosion venting is caused is prevented, and after the oxygen flow is normal, feeding operation is normally carried out.
7) The invention is used for secondary gun feeding during blowing and smelting interruption.
The method is simple to operate, greatly reduces the explosion venting probability of the converter, and effectively realizes the stable operation of dry dedusting of the converter; has good popularization value.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (1)
1. A method for controlling dry dedusting explosion venting of a converter is characterized by comprising the following steps:
1) adjusting a preset opening of an oxygen flow regulating valve before converting, keeping low flow 3 seconds before converting, wherein the preset opening is 32-42% according to the conditions of oxygen pressure, slag quantity, scrap steel and converting stages, when the slag quantity is large, the quantity of light and thin scrap steel is large, the oxygen pressure is less than or equal to 1.8MPa, the upper limit of the preset opening is taken at the early converting stage, and when the slag quantity is small, the quantity of light and thin scrap steel is small, the oxygen pressure is greater than or equal to 2.0MPa, and the lower limit of the preset opening is taken at the middle and later converting stages;
2) the furnace mouth keeps micro-positive pressure by adjusting the rotating speed of the fan;
3) blowing by an oxygen lance when the oxygen content of a gas analyzer in the flue is more than or equal to 20 percent;
4) in an automatic state, slowing down carbon-oxygen reaction, controlling the time of low flow, and when the oxygen content is reduced, adjusting the oxygen flow upwards;
5) in an abnormal manual mode, blowing is started to blow at a low flow rate and a high lance position, when the oxygen content begins to decrease from 20%, the oxygen flow rate is adjusted upwards according to a CO curve, and the lance position of the oxygen lance is kept unchanged;
6) and when the oxygen flow is adjusted upwards, feeding, wherein each batch is less than 1 ton, and when the oxygen flow is normal, feeding is carried out, and each batch is more than or equal to 1 ton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110967060.0A CN113817890B (en) | 2021-08-23 | 2021-08-23 | Method for controlling dry dedusting explosion venting of converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110967060.0A CN113817890B (en) | 2021-08-23 | 2021-08-23 | Method for controlling dry dedusting explosion venting of converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113817890A CN113817890A (en) | 2021-12-21 |
| CN113817890B true CN113817890B (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110967060.0A Active CN113817890B (en) | 2021-08-23 | 2021-08-23 | Method for controlling dry dedusting explosion venting of converter |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114921606A (en) * | 2022-05-24 | 2022-08-19 | 芜湖新兴铸管有限责任公司 | Converter blowing method for avoiding discharge explosion |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6119718A (en) * | 1984-07-06 | 1986-01-28 | Nippon Steel Corp | Operating method of exhaust gas disposing system of closed-type converter in abnormal time |
| CN102952917B (en) * | 2012-11-08 | 2015-01-28 | 北京首钢股份有限公司 | Control method for preventing explosion venting of dry dedusting system in converter smelting process |
| CN104745759B (en) * | 2015-03-30 | 2017-06-09 | 河北钢铁股份有限公司邯郸分公司 | A kind of method for preventing dry dust removal equipment venting of dust explosion during less-slag operation |
| CN107794333A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | It is a kind of prevent from bessemerizing interrupt after venting of dust explosion method |
| CN107099638B (en) * | 2017-05-19 | 2019-01-08 | 山东钢铁股份有限公司 | It is a kind of to prevent from dry method dust converter from opening being blown off quick-fried control method |
| CN113215346B (en) * | 2021-05-19 | 2022-06-14 | 宝武集团鄂城钢铁有限公司 | Smelting method for reducing explosion venting incidence rate of converter |
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| CN113817890A (en) | 2021-12-21 |
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