EP3068910A1 - Four de réchauffage de produits sidérurgiques, tels que billettes et brames - Google Patents
Four de réchauffage de produits sidérurgiques, tels que billettes et bramesInfo
- Publication number
- EP3068910A1 EP3068910A1 EP14802201.5A EP14802201A EP3068910A1 EP 3068910 A1 EP3068910 A1 EP 3068910A1 EP 14802201 A EP14802201 A EP 14802201A EP 3068910 A1 EP3068910 A1 EP 3068910A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- burners
- product
- flame
- furnace
- products
- 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
- 238000003303 reheating Methods 0.000 title claims abstract description 10
- 238000011084 recovery Methods 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000003517 fume Substances 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000003546 flue gas Substances 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims 1
- 239000003063 flame retardant Substances 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract 3
- 238000005096 rolling process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 241001519451 Abramis brama Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/52—Methods of heating with flames
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- 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
-
- 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
- F27B9/36—Arrangements of heating devices
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
Definitions
- the invention relates to improvements made to the reheating furnaces of steel products such as billets and slabs and equipped with side burners.
- the furnaces concerned by the invention are of the kind which have longitudinal walls provided with side burners and end transverse walls and equipped with an inlet and an outlet for the products, the burners being arranged in successive rows.
- the furnaces comprising at the inlet a recovery zone followed immediately downstream, in the direction of advancement of the products, a preheating zone, then successive heating zones, a flue gas discharge channel being provided immediately at the entrance of the oven and the recovery zone being traversed by the fumes thus discharged, flowing in the opposite direction of the movement of the products, each product being arranged to extend transversely to the direction of travel.
- Inlet and outlet may be located on the sides of the craters for, for example, loading or side turning of the billets or on the ends of the ovens for, for example, slab ovens.
- the steel product such as billet or slab and reheated in the oven is then rolled to obtain a long product such as beams or profiles or a flat product such as thick plates or thin sheets.
- it is particularly important to respect the average temperature of the product TM corresponding to the product dewatering temperature but also the longitudinal profile of the product, that is to say the temperature profile along the product. , transversely to the axis of the oven.
- This invention provides a solution to the control of this longitudinal profile of the product by allowing to obtain significant temperature differences between the head and the tail of the product.
- Reheat furnaces for steel products are equipped with side burners that can be individually controlled in all or nothing and can control the length of the flame as stated in the patent FR 2 794 132. Each burner is independently controlled according to the heat demand of the product.
- Figure 1 of the accompanying drawings shows a reheating furnace, products shown in a view from above, with the left and right walls 2 of the oven for a direction of advancement of the products 3 from left to right of the figure.
- the oven is equipped with burners A, B, C ... N in the direction of advancement of the products, the burners on the left wall being marked by A1, B1, ... N 1, the burners on the right wall by A2, B2 ... N2.
- the number of burners depends on the capacity of the furnace and the type of products to be heated, in particular the type of material and the dimensions of the products.
- the recovery zone R Upstream of the first burners A1 and A2 is the recovery zone R which is not equipped with burners and in which the products 3 are heated by the passage of the fumes from all the burners before being discharged into a channel 5 towards the fireplace. It will be understood that this description of the burners and the description of their operation can be extended to the burners located above the products and to the burners below if they exist.
- the application of processes according to the state of the art allows the injection of a part of the thermal capacity of the burner (A ... N) for each cycle by operating it in operating mode. Off (ON / OFF), that is, by modulating its ignition time with respect to the cycle time. For example to inject a power of 30% of the nominal power of the burner (A ... N), it will be lit for 30% of each cycle of, for example, three minutes.
- the profile P 1 shows a homogeneous, equal temperature. at any point along the length of the product at the intended TM Mean Temperature.
- the profile P2 shows a product temperature lower than TM on the left end of the product and more important on the right end
- the profile P3 is inverse with a temperature higher than TM on the left and lower on the right
- the P4 profile in flattened V, shows a temperature of both ends of the product greater than TM and lower in the center
- the profile P5, in to it with double slope shows a temperature lower than TM at the ends of the product and greater than TM at center. All these product temperature profiles may be required by the rolling process with a temperature difference between the hottest point and the coldest point on the slab that can be variable.
- this temperature difference is typically between a few degrees and 50 ° C, depending on the rolling process and steel grades to produce.
- the method described in patent FR 2 794 132 allows existing furnaces to achieve these different temperature profiles using the ON / OFF operation of flame-modulation burners capable of producing a short or long flame.
- These flame-modulation burners are more complicated and more expensive than fixed-flame burners, so their number is limited to concentrate them, for example in a first heating zone following the preheating zone, or a second heating zone. following the first heating zone, and before the equalization zone at the furnace outlet.
- These burners of the first and second heating zones have high powers, which allows to have an effective action on the temperature profile of the product before its removal.
- the recovery zone R is considered as a passive zone for controlling the temperature profile of the products on the current furnaces.
- the operating methods of these current furnaces do not make it possible to obtain such temperature differences required by the processes corresponding to the rolling of new steels or very long products.
- the object of the invention is to provide an answer to this problem.
- a furnace for reheating steel products of the kind defined above is characterized in that it is equipped, in the first rows of burners, at least one row of flame-modulated side burners, capable of being controlled to produce a short flame or long flame, so as to generate a preferential flue gas flow into the recovery zone to initiate from the recovery zone, any desired temperature profile of the product, in particular on a slope.
- the furnace comprises means to ensure a specific ignition mode of all or part of the burners, in particular by using short-flame flame burners on the side of the product to be heated preferentially and by increasing the ignition time of the burners. burners on the product side to be heated preferentially to the detriment of the opposing burners.
- the burner control is carried out using a control means capable of controlling the length, for example short or long, of the flame or the ignition of all or part of the burners.
- the method of operating the ironing furnace for steel products, while each product is arranged so as to extend along the width of the furnace, and must have at the outlet of the furnace a determined temperature profile, in particular such that P2 or P3 represented in FIG. 2, is characterized in that the burners of at least the first row, in the direction of advancement of the products, operate in a short flame on the side of the end of the product which must be the hottest, and in a long flame on the side of the other end of the product, so as to initiate a temperature profile on the product of the type of the desired one at the outlet of the oven from the recovery zone of the oven.
- this command is performed using said control means.
- a specific ignition mode of all or part of the burners in particular by using modular flame burners with a short flame on the side. of the product to be heated preferentially and by increasing the ignition time of the burners on the side of the product to be heated preferentially to the detriment of the opposing burners.
- a method of operating a steel product reheating furnace equipped with flame-modulated side burners to obtain a flat longitudinal P1-type temperature profile on the product is characterized in that:
- the first burner (s) in the direction of advancement of the products are flame-modulation burners capable of producing a short flame or a long flame;
- the oven burners of the same row operate in identical mode on each side of the oven, for the type of flame and the ignition time.
- the method of operating an ironmaking furnace with adjustable flame burners and fixed flame burners may include the implementation of a variable flame and fixed flame burner piloting algorithm for produce any type of temperature profile in the product.
- the burner control algorithm is implemented in the burner control means.
- the process may be characterized by obtaining flat temperature profiles, such as P1, of the product in the direction orthogonal to the direction of travel.
- the process is characterized by obtaining slope product temperature profiles, such as P2 and P3, in the direction orthogonal to the direction of travel, the temperature of one end of the product being greater than that on the other end.
- the difference between the temperature of one end of the product and that of the other end may be at least 60 ° C, especially between 60 ° C and 120 ° C.
- the process according to the invention can be characterized by obtaining double slope temperature profiles, such as P4 and P5, with a product temperature, between the ends, greater or less than that of the product center.
- Fig. 1 is a simplified diagram of a reheat furnace according to the invention, in which the burner B1 operates in short flame and C1 in long flame.
- Fig. 2 is a diagram illustrating several longitudinal temperature profiles in a product, in particular at the outlet of the oven, and
- Fig. 3 is a diagram of the oven similar to that of FIG. 1, the burners A to C of the oven being lit in short flame on the left side and in long flame on the right side of the oven.
- the invention provides a solution to the problem defined above by using the burners or part of the burners of the preheating zone of the oven, that is to say the zone immediately downstream of the recovery zone R of the oven, and by controlling them so as to obtain these temperature differences on the longitudinal profile of the product adapted to the needs of the rollers.
- the specific control of these preheating burners will influence the flow of fumes in the recovery zone which will initiate the formation of the desired temperature difference from the recovery zone R of the furnace.
- the recovery zone R of the furnace becomes active whereas it is traditionally considered passive for the control of the product temperature profile in furnaces built according to the state of the art.
- the control of the burners is performed by the CM control means.
- FIG. 3 shows an application according to the invention.
- the invention is based on the use of flame-type burners at the furnace inlet, in the preheating zone as shown in FIG. 3 in A1 - A2 in B1 - B2 and C1 C2, and in controlling them. in particular to generate a flow of fumes in the recovery zone R of the furnace that can initiate the desired temperature profile to the product of the product, this temperature profile being completed by the action of all the burners located in downstream of the burners in the preheating zone of the oven.
- the burners are arranged in transversely oriented rows, particularly orthogonally, in the direction of advancement of the products.
- the control of the burners is performed by the CM control means.
- the oven is shown in plan view with a direction of movement of the products 3 - partially shown - from left to right.
- Burners A1 and A2 are flame-modulating burners in the preheating zone of the furnace, which means the first burners installed in the forward direction of the products.
- the preheating zone may comprise one or more rows of burners on each side of the oven depending on its production tonnage and the type of products to be heated.
- the burners A1 and A2 may be composed of two burners located in a vertical plane and situated one above and one below the plane of the products, and forming two superposed rows on an oven for heating tubular spar steel products, or a single burner, the burners A1 and A2 forming a single row of burners above the product plane for a refractory beam furnace.
- the burner A1 operates in a short flame and that the burner A2 operates in a long flame.
- These burners have significant powers which generates large volumes of hot fumes.
- the burners B1 - C1 and B2 - C2 at the oven inlet are, if necessary, lit in short flame on the left side and in long flame on the right side of the oven.
- the combined effect of this choice of operating mode of the burners will create a preferential displacement of all the fumes of the burners installed in the oven according to the arrow 4 of FIG. 3, in the recovery zone R of the furnace and up to to their evacuation towards the chimney by the evacuation channel 5.
- This circulation of hot gas according to the arrow 4 will accelerate the heat exchange with the products 3 present in the recovery zone to produce a temperature increase of these products on the left side more important than the right side of the oven.
- the products thus heated more on the left than on the right side will adopt from the recovery zone a temperature profile of the type P3 of Figure 2 with a higher temperature of the end of the product located on the left side than on the right side.
- Burner A2 is permanently lit in long flame, burner A1 is lit in short flame so as to maintain the preferential circulation of 4. If necessary, as shown in Figure 3, the flame-modulation burners located after row A will be lit in a short flame on the left side of the oven to maintain and / or increase the temperature difference as desired by the rolling process.
- each burner is a single zone driven demand for power.
- the burners B1 and B2 if a thermal power of 70% is required in the row of burners B, the burners B1 and B2 will be lit 70% of the cycle time to obtain a homogeneous distribution of the thermal power injected into the product. If it is desired to obtain a higher temperature on the left side of the oven, it will be possible to keep the burner B1 lit in a short flame for 100% of the cycle time and to ignite the burner B2 in long flame only during 40% of the cycle time. By this means, a power identical to that required by the product is injected into the burner zone B1 and B2 but this power is shifted towards the end 1 of the product to generate a temperature profile of the P3 type.
- This mode of operation of the adjustable flame burners can be extended to all the adjustable flame burners installed in the oven.
- the invention preferably corresponds to the combined implementation of three characteristics:
- the implementation of this method thus makes it possible to increase the efficiency of the method of creating P2 and P3 type inclined thermal profiles in the slab by initiating it from the recovery zone by using modulating burners. flame in the preheating zone. By this means it is possible to obtain temperature differences over the length of the product which can equal or exceed 60 ° C for specific rolling processes.
- the piloting mode of the adjustable flame burners at the furnace inlet makes it possible to obtain a P3 type profile as explained above or, by adopting a symmetrical operating mode of the burners, to obtain a temperature profile of type P2 or, by mixing the times during which the burners on each side of the furnace operate in a short or long flame, to obtain any type of temperature profile of the product, for example the profiles P1, P4 and P5 or any combination thereof. profiles.
- the temperature difference between two points of the product is thus obtained by the operating mode of the oven according to the invention, and it is understood that the importance of the temperature difference will be controlled by the furnace control system by controlling the number necessary rows of burners until this difference in temperature.
- the control of the flow in the recovery zone used to prime the desired temperature profile at the furnace outlet could be obtained with an oven equipped with fixed flame burners provided that a burner on one side of the furnace is extinguished. which would have the effect of limiting the power injected into the row corresponding to the power of a single burner.
- the simultaneous implementation of the burner A1 short flame and A2 flame long allows the injection of the power of two burners in the row while creating the desired thermal effect on the product. This is particularly important in the preheating zone where the unit powers of the burners are important. If only one burner was lit on one side, its power should be doubled to create the desired thermal effect. Doubling the burner power would impose burner size increases, ducts and valves that may not be compatible with the available space on the oven walls.
- the method of the invention for achieving a temperature difference between two points of the product is controlled by the furnace control system by adjusting the operating mode of the flame-modulating burners (flame length) and adjusting the time of operation. ignition of all the burners (thermal power injected). By combining these two means of action, it is possible to obtain the desired product temperature profile.
- the operating mode mentioned above can also be used to produce small differences in temperature on the thermal profile of the product, keeping only the action of the heating and equalization zones to better control the temperature difference to be obtained on the product. product.
- This furnace control method can be ensured by the furnace operation optimization system so as to anticipate the changes in thermal regime of the furnace with respect to the products to be fired and to regulate with precision the importance of the temperature difference. obtained on the product.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Tunnel Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL14802201T PL3068910T3 (pl) | 2013-11-12 | 2014-11-07 | Piec do podgrzewania wyrobów hutniczych, takich jak kęsy i kęsiska |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1361013A FR3013109B1 (fr) | 2013-11-12 | 2013-11-12 | Four de rechauffage de produits siderurgiques, tels que billettes et brames |
PCT/IB2014/065873 WO2015071809A1 (fr) | 2013-11-12 | 2014-11-07 | Four de réchauffage de produits sidérurgiques, tels que billettes et brames |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3068910A1 true EP3068910A1 (fr) | 2016-09-21 |
EP3068910B1 EP3068910B1 (fr) | 2019-01-16 |
Family
ID=50069134
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14802201.5A Active EP3068910B1 (fr) | 2013-11-12 | 2014-11-07 | Four de réchauffage de produits sidérurgiques, tels que billettes et brames |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3068910B1 (fr) |
ES (1) | ES2719109T3 (fr) |
FR (1) | FR3013109B1 (fr) |
PL (1) | PL3068910T3 (fr) |
TR (1) | TR201903375T4 (fr) |
WO (1) | WO2015071809A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105258504A (zh) * | 2015-11-18 | 2016-01-20 | 南京安唯节能新技术有限公司 | 一种隧道窑及其燃烧控制方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2794132B1 (fr) * | 1999-05-27 | 2001-08-10 | Stein Heurtey | Perfectionnements apportes aux fours de rechauffage de produits siderurgiques |
-
2013
- 2013-11-12 FR FR1361013A patent/FR3013109B1/fr not_active Expired - Fee Related
-
2014
- 2014-11-07 PL PL14802201T patent/PL3068910T3/pl unknown
- 2014-11-07 WO PCT/IB2014/065873 patent/WO2015071809A1/fr active Application Filing
- 2014-11-07 EP EP14802201.5A patent/EP3068910B1/fr active Active
- 2014-11-07 TR TR2019/03375T patent/TR201903375T4/tr unknown
- 2014-11-07 ES ES14802201T patent/ES2719109T3/es active Active
Also Published As
Publication number | Publication date |
---|---|
FR3013109A1 (fr) | 2015-05-15 |
FR3013109B1 (fr) | 2018-03-02 |
WO2015071809A1 (fr) | 2015-05-21 |
TR201903375T4 (tr) | 2019-03-21 |
EP3068910B1 (fr) | 2019-01-16 |
PL3068910T3 (pl) | 2019-07-31 |
ES2719109T3 (es) | 2019-07-08 |
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