EP1427978A1 - Procede pour ameliorer le profil de temperature d'un four - Google Patents
Procede pour ameliorer le profil de temperature d'un fourInfo
- Publication number
- EP1427978A1 EP1427978A1 EP02772511A EP02772511A EP1427978A1 EP 1427978 A1 EP1427978 A1 EP 1427978A1 EP 02772511 A EP02772511 A EP 02772511A EP 02772511 A EP02772511 A EP 02772511A EP 1427978 A1 EP1427978 A1 EP 1427978A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oven
- heating means
- zone
- additional heating
- additional
- 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
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003517 fume Substances 0.000 claims abstract description 32
- 239000000446 fuel Substances 0.000 claims abstract description 16
- 238000003303 reheating Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 55
- 239000000779 smoke Substances 0.000 claims description 30
- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- 239000007800 oxidant agent Substances 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 230000000295 complement effect Effects 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000005485 electric heating Methods 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 2
- 239000000047 product Substances 0.000 description 26
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000011084 recovery Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 210000002381 plasma Anatomy 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
Definitions
- the present invention relates to a method for improving the temperature profile of an oven and in particular the temperature profile of a reheating or annealing furnace of products, more particularly of steel products such as slabs or billets or flat products. .
- Reheating and / or temperature maintaining furnaces are generally used in the steel industry, in particular in the continuous casting cycle, in which the molten metal is poured to form intermediate products which, before they pass through the rolling mill at the end of continuous casting chain, pass through at least one so-called reheating oven, in which the intermediate product is brought or maintained at an adequate temperature, as uniform as possible, in order to be then rolled under the best conditions.
- a reheating furnace of this type and its method of use is described, for example, in EP-A-0 370 916.
- a reheating furnace there is generally at least one zone equipped with heating means, for example burners, in order to provide the energy necessary for reheating or maintaining the temperature of metallurgical products.
- heating means for example burners
- the actual heating or full fire zone where combustion takes place (burners, plasmas, auxiliary heating, etc.) where the ambient or product temperature is controlled and possibly regulated.
- This zone is characterized by the fact that heat is produced "in situ", this heat produced being a direct means of controlling and / or regulating the temperature in this zone.
- the smoke exhaustion zone also called dead zone, where the smoke or the atmosphere coming from the heating zone lose part of their energy to the steel product entering the furnace. This zone contributes to the optimization of the thermal efficiency of the process.
- the so-called recovery zone comprising a recovery system which makes it possible to transfer part of the energy still present in the fumes or in the atmosphere that leaves the oven, to the oxidant necessary for combustion (preheating of the oxidant). By recycling, this energy is reintroduced into the oven, which further optimizes the overall energy balance.
- the dead zone of an oven is not regulated because the heat exchanges are totally dependent on the operating parameters of the heating zone and possibly of the recuperator.
- the thermal profiles in said zone are not optimized because they depend on the material flow conditions (fumes and metallurgical products) in the furnace and on their temperature conditions.
- FIG. 1 makes it possible to better explain the operation of a heating furnace of known type and the problems to be solved in order to improve its operation.
- the reheating furnace 1 is shown diagrammatically with the metallurgical products 5 advancing (by virtue of a system of beams 14 and drive means not shown in FIG. 1) from right to left, the direction d advancement of these products being represented by arrows 7.
- the oven 1 here comprises a heating zone 2 in which the temperature varies between 1200 ° C and 1400 ° C, this zone 2 being equipped with burners and comprising one or more regulation zones. The burners are not shown in this figure. Only the hot air circuit is briefly shown (13).
- the oven also has a dead zone 3, which is generally the preferred path for the passage of smoke, in which the temperature of the smoke is generally of the order of 900 ° C.
- the fumes are used to preheat the air (oxidant) from the oxidant generator 11 via the line 10, in the recuperator 9 from which the oxidant comes out preheated in the line 12 which supplies the burners 13 by oxidant (the fuel pipes of the burners are not shown in FIG. 1).
- the dead zone 3 is little heated during the entire production period and there is in fact the possibility of having, at least during part of the production time, a higher temperature in this zone in order to '' have better preheating of steel products.
- recuperator (as described in Figure 1), it usually works at a temperature close to its maximum temperature (in other words, the temperature of the fumes entering the recuperator is close to the maximum temperature that can support the recuperator without suffering damage), it is not possible to supply it with fumes whose temperature would have been increased by 200 ° C. Consequently, the person skilled in the art is confronted with the problem of the substantial increase in the temperature of the dead zone of the furnace, and in particular its vault temperature without a substantial correlative increase in the temperature of the flue gases at the outlet of the furnace.
- the invention makes it possible to solve the technical problem thus posed.
- the invention provides for using heating means complementary, placed in the dead zone (3) of the furnace (or having a thermal action on the dead zone of the furnace), without substantial creation of additional fumes, so as to thus avoid any substantial transfer of energy, and in particular energy generated by these additional heating means, via the smoke (and in particular additional smoke).
- substantially creation of additional smoke means, according to the invention, the creation of at least 10% by volume of additional smoke, relative to the volume of smoke created in the oven in the absence of the additional heating means.
- the additional heating means will be dimensioned so as not to create more than 10% vol. additional fumes, and preferably not more than 5% vol. additional smoke, relative to the volume of smoke created by the other burners in the oven, in the absence of these additional heating means (the other oven burners operating identically in both cases, for the purpose of comparing volumes of smoke).
- the energy produced by these additional means may represent up to 20% of the total energy supplied (or even up to 25% of the initial installed power).
- the complementary heating means will preferably be burners, the oxidant of at least one of these burners is enriched with oxygen (more than 21% O 2 in oxygen), preferably burners of which the oxidizer contains more than 88% vol. oxygen (for example, oxygen supplied by an apparatus for separating gases from air by adsorption of the “VSA” type, well known to those skilled in the art) and more preferably oxygen industrially pure with more than 95% oxygen by volume, the complement preferably being essentially argon and nitrogen.
- the oxidizer may comprise from 1% to 10% by volume of argon and / or from 0.1% to 10% by volume of nitrogen. Of course, an oxidizer containing 100% oxygen is perfectly suitable.
- oxygen burners may be suitable, in particular those which do not generate any additional smoke such as radiant panels (electric heating resistors), radiant burners or even regenerative type burners which generate practically very little additional smoke in the normal smoke circuit because they are designed to suck in the outside air, preheat it by heat exchange with an equivalent volume of smoke also drawn into the oven, discharge the smoke out of the oven into a specific smoke circuit after thermal "exhaustion” of these and use of the air thus preheated as (at least part of) the oxidizer in the burner.
- radiant panels electric heating resistors
- radiant burners or even regenerative type burners which generate practically very little additional smoke in the normal smoke circuit because they are designed to suck in the outside air, preheat it by heat exchange with an equivalent volume of smoke also drawn into the oven, discharge the smoke out of the oven into a specific smoke circuit after thermal "exhaustion" of these and use of the air thus preheated as (at least part of) the oxidizer in the burner.
- the additional heating means will generally be arranged in the dead zone, opposite the flue gas exhaust duct to the recuperator (when there is such a recuperator).
- the smoke evacuation is often in the lower part of the oven, the additional heating means will therefore preferably be placed in the upper part (towards the roof) of the oven. The opposite situation remains possible, however.
- the first in which the power delivered by the burners in the heating zone is significant and the maximum limit of the oven vault temperature is reached, while the fumes are evacuated from the oven after passing through the dead zone at a temperature which is quite far from the maximum inlet temperature of the fumes in the recuperator.
- this type of configuration it is not possible to heat more, upstream (in the heating zone) with the existing burners, even if the temperatures of the walls and the vault in the dead zone are too low to ensure a good preheating of steel products.
- the second in which, unlike the previous one, the temperature of the fumes leaving the dead zone is maximum, while the temperature of the vault in the heating zone is significantly lower than the maximum temperature that this vault can withstand.
- the power cannot be increased in the heating zone, under penalty of damaging the roof in the dead zone and / or the recuperator.
- the present invention consists in the implementation of an additional heating means which makes it possible to increase the thermal transfers to the product in the dead zone without generating significant energy transfer towards the evacuation of the fumes in the oven.
- this additional heating means makes it possible in particular to bring all or part of the dead zone to its maximum admissible temperature T max Vault, this temperature generally depending on the geometry and the constituent elements of the oven, the choice of additional means of heating and of the speed, in particular, of circulation of the fumes being such that the temperature of said fumes does not exceed the maximum admissible temperature T max Fumes.
- This temperature reprofiling will provide the maximum possible heat transfer in this portion of the oven.
- the maximum temperature limit at the recuperator is generally of the order of 900 ° C. According to another aspect of the invention, it is therefore necessary to control the temperature of the fumes leaving the oven so as to keep it below the limit value (for example 900 ° C. in the example above) , for example by regulating the additional heating means by measuring the temperature of the fumes leaving the oven.
- the total power delivered to the oven is 5 to 20% greater than the initial power.
- the temperature profile at the inlet of the oven is higher (900 ° C to 1200 ° C), especially in areas that have been little valued before (600 ° C-900 ° C).
- the increase in production generated is between 5% and 25%, depending on the installed power. The energy loss under these conditions remains below 5%.
- it also allows multiple operational gains and in particular: improvement in the temperature uniformity of the product, improvement in the surface quality of the product, reduction of product distortions.
- FIG. 2 represents an implementation of the invention.
- Oxy-fuel burners have been installed in the dead zone of an oven, the power of which represents approximately 10% of the air-fuel power existing on the oven.
- the temperature in the dead zone of the oven tested was typically around 650 ° C and the temperature at the head of the recuperator was around 820 ° C (below 850 ° C).
- the oxygen supplied for the oxidizer comprises more than 88% O 2l preferably more than 95% vol. O 2 , the complement being nitrogen and argon
- a regulation temperature raised to 900 ° C. in the dead zone there is no significant increase in the temperature at the head of the recuperator. Reshaping the roof temperature results in a 5% increase in production, for a 5% increase in power.
- FIG. 2 the same elements as those in FIG. 1 have the same references.
- the lines 16, 17 of oxygen supply coming from the oxygen generator 18, supplying three oxy-fuel burners (20) placed in a side wall of the furnace 1 are shown diagrammatically above the dead zone 4. burners in the wall opposite it).
- the reference 21 represents another possible location of the (additional) oxy-fuel burners in the roof of the oven for additional heating of the dead zone 3.
- the additional burners can also be installed in the zone 4 (part of the zone 3) slightly heated from the oven, for example at the location of the reference 22 in FIG. 2.
- FIG. 2a which is an enlargement of part of the dead zone 3 of the oven, shows the possible installation of these different burners 20 and / or 21 and / or 22 and their respective flames 23, 24 on the one hand for the burners 21 and 25 on the other hand for the burner 22.
- the method according to the invention also brings flexibility to the production means of a user of ovens, since the additional or complementary means can be stopped or powered up (stop or start) according to the production / productivity needs of the oven. It follows that the oven will operate, according to the invention, with a temperature in the so-called recovery and / or exhaustion zone of the fumes which may very clearly be higher than the limit temperature of the recuperator.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Air Supply (AREA)
- Tunnel Furnaces (AREA)
- Furnace Details (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Heat Treatment Of Articles (AREA)
- Gasification And Melting Of Waste (AREA)
- Electric Ovens (AREA)
- Control Of Temperature (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0111537 | 2001-09-06 | ||
FR0111537A FR2829232B1 (fr) | 2001-09-06 | 2001-09-06 | Procede pour ameliorer le profil de temperature d'un four |
PCT/FR2002/002931 WO2003021174A1 (fr) | 2001-09-06 | 2002-08-23 | Procede pour ameliorer le profil de temperature d'un four |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1427978A1 true EP1427978A1 (fr) | 2004-06-16 |
EP1427978B1 EP1427978B1 (fr) | 2005-11-02 |
Family
ID=8867028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02772511A Expired - Lifetime EP1427978B1 (fr) | 2001-09-06 | 2002-08-23 | Procede pour ameliorer le profil de temperature d'un four |
Country Status (10)
Country | Link |
---|---|
US (1) | US6935856B2 (fr) |
EP (1) | EP1427978B1 (fr) |
JP (1) | JP2005501966A (fr) |
CN (1) | CN100397021C (fr) |
AT (1) | ATE308732T1 (fr) |
CA (1) | CA2459802C (fr) |
DE (1) | DE60207095T2 (fr) |
ES (1) | ES2252515T3 (fr) |
FR (1) | FR2829232B1 (fr) |
WO (1) | WO2003021174A1 (fr) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009031557A1 (de) * | 2009-03-02 | 2010-09-09 | Sms Siemag Ag | Energierückgewinnung in Warmbandstraßen durch Umwandlung der Kühlwärme der Stranggießanlage sowie der Restwärme von Brammen und Coils in elektrische Energie oder sonstige Nutzung der aufgefangenen Prozesswärme |
ITRE20060094A1 (it) * | 2006-07-28 | 2008-01-29 | Sacmi Forni Spa | Forno a tunnel per manufatti ceramici |
EP2101906B1 (fr) * | 2007-01-09 | 2010-07-07 | L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Procede de remplacement des tubes de catalyseur d'un reformeur d'hydrocarbures |
US20090035712A1 (en) * | 2007-08-01 | 2009-02-05 | Debski Paul D | Reheat Furnace System with Reduced Nitrogen Oxides Emissions |
US9440179B2 (en) * | 2014-02-14 | 2016-09-13 | InovaLabs, LLC | Oxygen concentrator pump systems and methods |
MA43067A (fr) | 2015-07-16 | 2018-05-23 | Messer Austria Gmbh | Dispositif et procédé pour réchauffer des produits métalliques |
FR3053105B1 (fr) * | 2016-06-27 | 2018-06-15 | Fives Stein | Installation de recuperation d'energie calorifique sur un four a longerons tubulaires et de conversion de celle-ci en electricite au moyen d'une turbine produisant de l'electricite par la mise en oeuvre d'un cycle de rankine |
US11612457B2 (en) | 2017-03-22 | 2023-03-28 | World Class Technology Corporation | Adjustable hook for orthodontic brackets |
FR3142963A1 (fr) | 2022-12-09 | 2024-06-14 | Psa Automobiles Sa | Support de fixation d’un rétroviseur extérieur sur un montant de la structure de caisse d’un véhicule |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4087238A (en) * | 1976-09-13 | 1978-05-02 | United States Steel Corporation | Method for enhancing the heating efficiency of continuous slab reheating furnaces |
US4257767A (en) * | 1979-04-30 | 1981-03-24 | General Electric Company | Furnace temperature control |
JPS5848009B2 (ja) * | 1979-11-26 | 1983-10-26 | 日本鋼管株式会社 | 多帯式加熱炉の温度制御方法 |
US4357135A (en) * | 1981-06-05 | 1982-11-02 | North American Mfg. Company | Method and system for controlling multi-zone reheating furnaces |
US4427371A (en) * | 1982-01-20 | 1984-01-24 | Loftus Furnace Company | Pusher furnace with soak zone lifter |
FR2568359B1 (fr) * | 1984-07-27 | 1987-01-09 | Siderurgie Fse Inst Rech | Dispositif pour l'homogeneisation en temperature par voie inductive de produits metalliques en defilement |
DE3540764C1 (de) * | 1985-11-16 | 1987-05-21 | Riedhammer Ludwig Gmbh | Durchlaufofen |
IT1227500B (it) | 1988-11-25 | 1991-04-12 | Heurtey Italiana Spa | Forno di riscaldo, mantenimento ed accumulo di prodotti siderurgici. |
JPH04214183A (ja) * | 1990-12-04 | 1992-08-05 | Ngk Spark Plug Co Ltd | 連続炉 |
TW265286B (fr) * | 1993-06-23 | 1995-12-11 | Gas Res Inst | |
DE4412170C1 (de) * | 1994-04-08 | 1995-08-10 | Krantz Tkt Gmbh | Verfahren zur oxidativen Beseitigung von in Gasen enthaltenen Schadstoffen |
FR2785668B1 (fr) * | 1998-11-10 | 2001-02-23 | Air Liquide | Procede de chauffage d'un four a chargement continu notamment pour produits siderurgiques, et four de chauffage a chargement continu |
US6290492B1 (en) * | 2000-02-15 | 2001-09-18 | Air Products And Chemicals, Inc. | Method of reducing NOx emission from multi-zone reheat furnaces |
FR2813893B1 (fr) * | 2000-09-08 | 2003-03-21 | Air Liquide | Procede de rechauffage de produits metallurgiques |
-
2001
- 2001-09-06 FR FR0111537A patent/FR2829232B1/fr not_active Expired - Fee Related
-
2002
- 2002-08-23 ES ES02772511T patent/ES2252515T3/es not_active Expired - Lifetime
- 2002-08-23 AT AT02772511T patent/ATE308732T1/de not_active IP Right Cessation
- 2002-08-23 CN CNB028172752A patent/CN100397021C/zh not_active Expired - Fee Related
- 2002-08-23 JP JP2003525210A patent/JP2005501966A/ja active Pending
- 2002-08-23 DE DE60207095T patent/DE60207095T2/de not_active Expired - Lifetime
- 2002-08-23 US US10/489,083 patent/US6935856B2/en not_active Expired - Lifetime
- 2002-08-23 EP EP02772511A patent/EP1427978B1/fr not_active Expired - Lifetime
- 2002-08-23 WO PCT/FR2002/002931 patent/WO2003021174A1/fr active IP Right Grant
- 2002-08-23 CA CA2459802A patent/CA2459802C/fr not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO03021174A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2252515T3 (es) | 2006-05-16 |
FR2829232B1 (fr) | 2004-08-20 |
CA2459802A1 (fr) | 2003-03-13 |
DE60207095T2 (de) | 2006-07-20 |
CN1625677A (zh) | 2005-06-08 |
CA2459802C (fr) | 2010-11-30 |
CN100397021C (zh) | 2008-06-25 |
US6935856B2 (en) | 2005-08-30 |
FR2829232A1 (fr) | 2003-03-07 |
US20040259047A1 (en) | 2004-12-23 |
DE60207095D1 (de) | 2005-12-08 |
ATE308732T1 (de) | 2005-11-15 |
EP1427978B1 (fr) | 2005-11-02 |
WO2003021174A1 (fr) | 2003-03-13 |
JP2005501966A (ja) | 2005-01-20 |
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