EP1446984A2 - Electrode, in particular for siderurgical electric arc furnaces and the like, and related operation method - Google Patents
Electrode, in particular for siderurgical electric arc furnaces and the like, and related operation methodInfo
- Publication number
- EP1446984A2 EP1446984A2 EP02788534A EP02788534A EP1446984A2 EP 1446984 A2 EP1446984 A2 EP 1446984A2 EP 02788534 A EP02788534 A EP 02788534A EP 02788534 A EP02788534 A EP 02788534A EP 1446984 A2 EP1446984 A2 EP 1446984A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- fluid
- gaseous hydrocarbon
- combustible
- tip
- 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.)
- Granted
Links
- 238000010891 electric arc Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000012530 fluid Substances 0.000 claims abstract description 66
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 21
- 239000010439 graphite Substances 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 15
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 13
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001273 butane Substances 0.000 claims abstract description 6
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims abstract description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001294 propane Substances 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 150000001247 metal acetylides Chemical class 0.000 claims description 9
- 230000001603 reducing effect Effects 0.000 claims description 9
- 239000003245 coal Substances 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 3
- 239000002817 coal dust Substances 0.000 claims description 3
- 239000010730 cutting oil Substances 0.000 claims description 3
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 230000023556 desulfurization Effects 0.000 claims description 2
- 239000000295 fuel oil Substances 0.000 claims 2
- 229910002065 alloy metal Inorganic materials 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- 230000001590 oxidative effect Effects 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000001816 cooling Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000009628 steelmaking Methods 0.000 description 6
- 230000003078 antioxidant effect Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 5
- 238000005187 foaming Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000011343 solid material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000003963 antioxidant agent Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 238000004904 shortening Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- -1 carbides of Calcium Chemical class 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 208000018459 dissociative disease Diseases 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000003923 scrap metal Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/06—Electrodes
- H05B7/08—Electrodes non-consumable
- H05B7/085—Electrodes non-consumable mainly consisting of carbon
Definitions
- the technical problem underlying the present invention is that of providing novel electrodes allowing to overcome the abovementioned drawbacks, in particular allowing to reduce the consumption thereof and therefore the maintenance interventions.
- the electrode 10 is provided with an axial hole 19, first means for ejecting a fluid comprising a nozzle 20 being housed therein.
- the nozzle 20 water-cooled by means of a cooling duct 18 running therethrough, is slidable inside of the hole 19.
- the fluid 22 comprises at least one heat decomposable Carbon-rich combustible component, in particular a gaseous hydrocarbon selected from the group comprising methane, ethane, propane, butane and mixtures thereof, and it is denominated 'reactive fluid' as it is apt to carry out a reducing/combustible action, with metallurgic functions analogous to those of coal usually found inside of an electric furnace.
- the fluid 22 exits the ejecting nozzle, crossing the end section of the axial hole of the electrode at a suitable rate, heating up, yet not slowly enough to undergo substantial chemical transformations, until reaching the tip 14 of the electrode 10 whereat its molecular breaking is carried out by the heat provided by an electric arc.
- the electrode 10 (graphite and metallic material versions) further comprises second means 23 for ejecting a second fluid 24. Said means 23 is positioned onto the cylinder-shaped surface of the electrode 10, bottomwise to the body 16.
- the nozzle head 21 may comprise a single inlet, from which a fluid, optionally in a mixture formed with at least one fluid reactive component is injected, or it may comprise a plurality of outlets, each corresponding to a reactive fluid ejected and fed separately from the other fluids.
- the electric arc 15 radiates less towards the refractory walls of the furnace 1, reducing the entailed damage thereto and also improving heat transmission to the bath 12.
- the mentioned results have been constantly sought in steelshop electric furnaces, during flat bath operation steps, by generating foaming slags or reducing the electrical power, entailing bath oxidation and productivity decrease, respectively.
- the shortening of the electric arc attained by this method reduces the need to employ materials (C, CaCO 3 , carbides) to generate foaming slags.
- foaming slag generation is extremely difficult and costly in terms of Cr yield, Cr being oxidized by the generation-required Oxygen.
- the employ of the electrode subject-matter of the present invention allowed to generally decrease the environmental impact, owing to reduced:
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2001RM000634A ITRM20010634A1 (en) | 2001-10-26 | 2001-10-26 | ELECTRODE, IN PARTICULAR FOR ELECTRIC ARC OVENS OF A STEEL AND SIMILAR TYPE, AND RELATIVE METHOD OF OPERATION. |
ITRM20010634 | 2001-10-26 | ||
PCT/IT2002/000679 WO2003037038A2 (en) | 2001-10-26 | 2002-10-25 | Electrode, in particular for siderurgical electric arc furnaces and the like, and related operation method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1446984A2 true EP1446984A2 (en) | 2004-08-18 |
EP1446984B1 EP1446984B1 (en) | 2006-02-08 |
Family
ID=11455844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02788534A Expired - Lifetime EP1446984B1 (en) | 2001-10-26 | 2002-10-25 | Electrode, in particular for siderurgical electric arc furnaces and the like, and related operation method |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1446984B1 (en) |
AT (1) | ATE317630T1 (en) |
AU (1) | AU2002353509A1 (en) |
DE (1) | DE60209146T2 (en) |
ES (1) | ES2260496T3 (en) |
IT (1) | ITRM20010634A1 (en) |
WO (1) | WO2003037038A2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013222158A1 (en) * | 2013-10-31 | 2015-05-13 | Siemens Aktiengesellschaft | Method of operating an electric arc furnace and electric arc furnace |
DE102013222159A1 (en) * | 2013-10-31 | 2015-04-30 | Siemens Aktiengesellschaft | Method of operating an electric arc furnace and electric arc furnace |
JP6413710B2 (en) * | 2014-12-02 | 2018-10-31 | 新日鐵住金株式会社 | Production method of high purity steel by DC arc electric furnace |
DE102020005129A1 (en) | 2020-08-21 | 2022-02-24 | Technische Universität Bergakademie Freiberg, Körperschaft des öffentlichen Rechts | Low-carbon and carbon-free electrodes for use in steel metallurgy |
DE102020005130B3 (en) | 2020-08-21 | 2022-02-10 | Technische Universität Bergakademie Freiberg, Körperschaft des öffentlichen Rechts | Process for the production of low-carbon and carbon-free electrode-honeycomb material composites for use in metallurgy |
CN112595093B (en) * | 2020-11-26 | 2022-05-27 | 天津水泥工业设计研究院有限公司 | Electrode heating process and device capable of blowing powder for electric arc furnace |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1334116A (en) * | 1971-01-22 | 1973-10-17 | British Steel Corp | Arc furnace operation |
GB1390351A (en) * | 1971-02-16 | 1975-04-09 | Tetronics Research Dev Co Ltd | High temperature treatment of materials |
GB1532075A (en) * | 1976-08-24 | 1978-11-15 | Karinsky V | Electric arc heating vacuum apparatus |
DE3443740A1 (en) * | 1984-10-11 | 1986-04-17 | Fried. Krupp Gmbh, 4300 Essen | METHOD AND DEVICE FOR HOLDING OR INCREASING THE TEMPERATURE OF A METAL MELT |
DE3629055A1 (en) * | 1986-08-27 | 1988-03-03 | Kloeckner Cra Tech | METHOD FOR INCREASING ENERGY IN ELECTRIC ARC FURNACES |
-
2001
- 2001-10-26 IT IT2001RM000634A patent/ITRM20010634A1/en unknown
-
2002
- 2002-10-25 WO PCT/IT2002/000679 patent/WO2003037038A2/en not_active Application Discontinuation
- 2002-10-25 AU AU2002353509A patent/AU2002353509A1/en not_active Abandoned
- 2002-10-25 AT AT02788534T patent/ATE317630T1/en active
- 2002-10-25 EP EP02788534A patent/EP1446984B1/en not_active Expired - Lifetime
- 2002-10-25 DE DE60209146T patent/DE60209146T2/en not_active Expired - Lifetime
- 2002-10-25 ES ES02788534T patent/ES2260496T3/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03037038A3 * |
Also Published As
Publication number | Publication date |
---|---|
AU2002353509A1 (en) | 2003-05-06 |
ATE317630T1 (en) | 2006-02-15 |
ES2260496T3 (en) | 2006-11-01 |
ITRM20010634A0 (en) | 2001-10-26 |
WO2003037038A3 (en) | 2004-05-06 |
DE60209146D1 (en) | 2006-04-20 |
ITRM20010634A1 (en) | 2003-04-28 |
EP1446984B1 (en) | 2006-02-08 |
DE60209146T2 (en) | 2006-10-19 |
WO2003037038A2 (en) | 2003-05-01 |
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