CN113388713A - Treatment method for converter blowing oxygen lance incapable of normally striking fire - Google Patents
Treatment method for converter blowing oxygen lance incapable of normally striking fire Download PDFInfo
- Publication number
- CN113388713A CN113388713A CN202110581947.6A CN202110581947A CN113388713A CN 113388713 A CN113388713 A CN 113388713A CN 202110581947 A CN202110581947 A CN 202110581947A CN 113388713 A CN113388713 A CN 113388713A
- Authority
- CN
- China
- Prior art keywords
- converter
- oxygen lance
- oxygen
- lance
- mode
- 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 76
- 239000001301 oxygen Substances 0.000 title claims abstract description 76
- 238000007664 blowing Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910017135 Fe—O Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a treatment method for a converter blowing oxygen lance when normal sparking cannot be realized, which comprises the following steps: 1) adding iron and scrap steel in a converter and then placing the converter at a zero position; 2) if the oxygen lance is not successfully fired in the semi-automatic mode, the operation mode of the oxygen lance is switched to a manual mode, the oxygen lance is manually lowered to a lance position of 330 +/-10 cm, and the oxygen flow is set to be 30-36 kNm3The oxygen supply intensity is set to 2-3 Nm3T.min; 3) and opening an oxygen valve in a manual mode, and switching the operation mode of the oxygen lance into a semi-automatic mode to start smelting after the ignition is successful. When the oxygen lance is difficult to ignite in a conventional blowing mode in an abnormal state of the converter, the converter oxygen lance can be successfully ignited safely and efficiently by a reasonable operation mode, and safety and environmental protection accidents caused by the fact that the converter oxygen lance is not ignited when blowing are effectively avoided.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a treatment method for a converter blowing oxygen lance when the converter blowing oxygen lance cannot normally strike fire.
Background
In the process of smelting in a converter, when the furnace burden is more light and thin scrap steel, the furnace burden is excessively high in accumulation in the converter after being added, and oxygen flow cannot rush to the liquid level, so that an oxygen lance does not catch fire; this situation is occurring with an ever increasing probability in the current trend advocating "lifting scrap and lowering iron". In addition, the converter can be added with fluxes such as lime, dolomite and the like after blowing, a large amount of fluxes cause agglomeration on the liquid surface of a molten pool, and oxygen flow cannot blow out an agglomerated layer, so that the oxygen lance can not catch fire. Not only in the abnormal accident state, the freezing condition of the surface layer of the molten pool can occur, so that the oxygen lance can not catch fire; when the repairing mass collapses after entering the furnace or when viscous slag floats after slag splashing, the oxygen lance can not catch fire.
When the converter blowing oxygen lance is not fired, iron oxide in the converter can be accumulated, and after the temperature rises, explosive splashing is easy to occur, so that safety and environmental protection accidents are caused. Meanwhile, the accumulated iron oxide can erode the furnace lining; the middle part of the jet flow of the porous nozzle forms a negative pressure area, if the oxygen lance is not fired for a long time, jet flow disorder can be caused, the flushed metal iron liquid drops are adhered to the end surface of the nozzle, after the temperature rises, the copper of the nozzle of the oxygen lance is in a molten state, the iron and the copper form a solid solution and are firmly adhered together, the heat conductivity of the nozzle is influenced, if the hot metal liquid drops are adhered again in the blowing process, Fe-O reaction can occur, the copper is melted by the released heat, and the nozzle is damaged.
Disclosure of Invention
The invention provides a treatment method for the condition that a converter blowing oxygen lance cannot normally ignite, which can safely and efficiently realize the successful ignition of the converter oxygen lance through a reasonable operation mode when the oxygen lance is difficult to ignite in a conventional blowing mode under the abnormal state of the converter, thereby effectively avoiding the occurrence of safety and environmental protection accidents caused by the condition that the converter blowing oxygen is not ignited.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment method for the condition that a converter blowing oxygen lance cannot normally strike fire comprises the following steps:
1) adding iron and scrap steel in a converter and then placing the converter at a zero position;
2) if the oxygen lance is not successfully fired in the semi-automatic mode, the operation mode of the oxygen lance is switched to a manual mode, the oxygen lance is manually lowered to a lance position of 330 +/-10 cm, and the oxygen flow is set to be 30-36 kNm3H, supply ofThe oxygen intensity is set to 2 to 3Nm3/t·min；
3) And opening an oxygen valve in a manual mode, and switching the operation mode of the oxygen lance into a semi-automatic mode to start smelting after the ignition is successful.
In the step 1), after adding iron and adding scrap steel into the converter, rocking the converter to-35 to-45 degrees at the steel tapping side, rocking the converter to +65 to +75 degrees in front of the converter, and repeatedly rocking the converter twice, and then placing the converter at a zero position.
During the ignition period of the oxygen lance, slag charge and coolant are not added into the converter; after the ignition is successful, the oxygen lance operation mode is switched to a semi-automatic mode, and the oxygen flow is recovered to 50kNm3After the reaction time is over/h, adding slag charge and coolant.
Compared with the prior art, the invention has the beneficial effects that:
when the oxygen lance is difficult to ignite in a conventional blowing mode under the abnormal state of the converter, the converter oxygen lance can be safely and efficiently ignited through a reasonable operation mode, and the occurrence of safety and environmental protection accidents caused by the fact that the converter oxygen lance is not ignited is effectively avoided.
Detailed Description
The invention relates to a treatment method for a converter blowing oxygen lance when normal sparking cannot be realized, which comprises the following steps:
1) adding iron and scrap steel in a converter and then placing the converter at a zero position;
2) if the oxygen lance is not successfully fired in the semi-automatic mode, the operation mode of the oxygen lance is switched to a manual mode, the oxygen lance is manually lowered to a lance position of 330 +/-10 cm, and the oxygen flow is set to be 30-36 kNm3The oxygen supply intensity is set to 2-3 Nm3/t·min；
3) And opening an oxygen valve in a manual mode, and switching the operation mode of the oxygen lance into a semi-automatic mode to start smelting after the ignition is successful.
In the step 1), after adding iron and adding scrap steel into the converter, rocking the converter to-35 to-45 degrees at the steel tapping side, rocking the converter to +65 to +75 degrees in front of the converter, and repeatedly rocking the converter twice, and then placing the converter at a zero position.
During the ignition period of the oxygen lance, slag charge and coolant are not added into the converter; when the ignition is successful, the operation mode of the oxygen lance is switched to be halfAutomatic mode, and oxygen flow is restored to 50kNm3After the reaction time is over/h, adding slag charge and coolant.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. Any person skilled in the art should be able to substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention.
[ examples ] A method for producing a compound
In the embodiment, in the smelting process of the 260-ton converter, the oxygen lance cannot be normally fired in a semi-automatic mode due to abnormal conditions, and the treatment process is as follows:
1) the slag pouring angle of the converter is more than 180 degrees;
2) firstly adding scrap steel and then adding iron into the converter, then rocking the converter to-40 ℃ towards the steel tapping side, rocking the converter to +70 ℃ towards the front of the converter, repeatedly rocking the converter for two times, and then placing the converter at a zero position;
3) the oxygen lance operation mode is switched to a manual mode, the lance position of the oxygen lance at the conventional oxygen starting point is positioned at 501cm, the oxygen lance is manually lowered to the lance position at 330 +/-10 cm, and the oxygen blow-on flow is controlled from the conventional 53.7kNm3Adjusting the/h to 33Nm3H, oxygen supply intensity of 2.12Nm3/t·min；
4) And opening the oxygen valve in a manual mode, switching the operation mode of the oxygen lance into a semi-automatic mode again after the ignition is successful, and starting smelting.
During the striking sparks, the converter can not be added with slag charge and coolant, when the striking sparks are successful, the oxygen lance operation mode is switched to a semi-automatic mode, and the oxygen flow is recovered to 53.7kNm3After the/h, the addition of slag and coolant is started again.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A treatment method for the condition that a converter blowing oxygen lance cannot normally strike fire is characterized by comprising the following steps:
1) adding iron and scrap steel in a converter and then placing the converter at a zero position;
2) if the oxygen lance is not successfully fired in the semi-automatic mode, the operation mode of the oxygen lance is switched to a manual mode, the oxygen lance is manually lowered to a lance position of 330 +/-10 cm, and the oxygen flow is set to be 30-36 kNm3The oxygen supply intensity is set to 2-3 Nm3/t·min；
3) And opening an oxygen valve in a manual mode, and switching the operation mode of the oxygen lance into a semi-automatic mode to start smelting after the ignition is successful.
2. The method for treating the condition that the converter blowing oxygen lance cannot normally strike fire according to claim 1, wherein in the step 1), after the converter is charged with iron and added with scrap, the converter is firstly shaken to-35 degrees to-45 degrees at the steel tapping side, then shaken to +65 degrees to +75 degrees at the front of the converter, and after the converter is repeatedly shaken twice, the converter is placed at a zero position.
3. The method as claimed in claim 1, wherein during the period of the oxygen lance firing, no slag and coolant are added to the converter; after the ignition is successful, the oxygen lance operation mode is switched to a semi-automatic mode, and the oxygen flow is recovered to 50kNm3After the reaction time is over/h, adding slag charge and coolant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110581947.6A CN113388713A (en) | 2021-05-25 | 2021-05-25 | Treatment method for converter blowing oxygen lance incapable of normally striking fire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110581947.6A CN113388713A (en) | 2021-05-25 | 2021-05-25 | Treatment method for converter blowing oxygen lance incapable of normally striking fire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113388713A true CN113388713A (en) | 2021-09-14 |
Family
ID=77619179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110581947.6A Pending CN113388713A (en) | 2021-05-25 | 2021-05-25 | Treatment method for converter blowing oxygen lance incapable of normally striking fire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113388713A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103555880A (en) * | 2013-10-16 | 2014-02-05 | 河北钢铁股份有限公司承德分公司 | Method for preventing electric precipitation explosion venting during blowing igniting of semi-steel steelmaking |
| CN107012283A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | Converter slag retention method |
| CN107475478A (en) * | 2017-07-14 | 2017-12-15 | 唐山钢铁集团有限责任公司 | Pneumatic steelmaking stays slag melting to open to blow non-ignitable operating method |
| CN108774659A (en) * | 2018-05-24 | 2018-11-09 | 山东钢铁股份有限公司 | A kind of remained converter slag method opens piping and druming ignition method |
| CN110129513A (en) * | 2019-05-05 | 2019-08-16 | 河钢股份有限公司承德分公司 | The method for preventing electric precipitator venting of dust explosion |
| CN110527776A (en) * | 2019-09-27 | 2019-12-03 | 山东钢铁股份有限公司 | The unsuccessful processing method of piping and druming fire is opened in a kind of converter |
| CN110656215A (en) * | 2019-09-27 | 2020-01-07 | 山东钢铁股份有限公司 | Method for preventing unsuccessful blowing and igniting of converter |
-
2021
- 2021-05-25 CN CN202110581947.6A patent/CN113388713A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103555880A (en) * | 2013-10-16 | 2014-02-05 | 河北钢铁股份有限公司承德分公司 | Method for preventing electric precipitation explosion venting during blowing igniting of semi-steel steelmaking |
| CN107012283A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | Converter slag retention method |
| CN107475478A (en) * | 2017-07-14 | 2017-12-15 | 唐山钢铁集团有限责任公司 | Pneumatic steelmaking stays slag melting to open to blow non-ignitable operating method |
| CN108774659A (en) * | 2018-05-24 | 2018-11-09 | 山东钢铁股份有限公司 | A kind of remained converter slag method opens piping and druming ignition method |
| CN110129513A (en) * | 2019-05-05 | 2019-08-16 | 河钢股份有限公司承德分公司 | The method for preventing electric precipitator venting of dust explosion |
| CN110527776A (en) * | 2019-09-27 | 2019-12-03 | 山东钢铁股份有限公司 | The unsuccessful processing method of piping and druming fire is opened in a kind of converter |
| CN110656215A (en) * | 2019-09-27 | 2020-01-07 | 山东钢铁股份有限公司 | Method for preventing unsuccessful blowing and igniting of converter |
Non-Patent Citations (4)
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| 李荣 等: "《转炉炼钢操作与控制》", 30 June 2012, 冶金工业出版社 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20210914 |