EP3322953A1 - Dispositif et procédé pour réchauffer des produits métalliques - Google Patents

Dispositif et procédé pour réchauffer des produits métalliques

Info

Publication number
EP3322953A1
EP3322953A1 EP16733910.0A EP16733910A EP3322953A1 EP 3322953 A1 EP3322953 A1 EP 3322953A1 EP 16733910 A EP16733910 A EP 16733910A EP 3322953 A1 EP3322953 A1 EP 3322953A1
Authority
EP
European Patent Office
Prior art keywords
products
zone
burners
preheating zone
subsequent
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.)
Withdrawn
Application number
EP16733910.0A
Other languages
German (de)
English (en)
Inventor
Michael Potesser
Johannes Rauch
Mathias SWOBODA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Austria GmbH
Original Assignee
Messer Austria GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Messer Austria GmbH filed Critical Messer Austria GmbH
Publication of EP3322953A1 publication Critical patent/EP3322953A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F27B9/12—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity with special arrangements for preheating or cooling the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/32—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air
    • 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
    • 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
    • F27D19/00—Arrangements of controlling 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • 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 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/05082—Disposition of radial jet burners in relation to an impingement surface, e.g. a heat transfer surface, to obtain flame re-attachment combustion
    • 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
    • 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
    • F27B2009/3607—Heaters located above the track of the charge
    • F27B2009/3615—Burner in the ceiling directed vertically downwards
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/004—Heating elements or systems using burners directed upon the charge, e.g. vertically

Definitions

  • the invention relates to a device for reheating metallic products for subsequent mechanical forming, comprising a furnace chamber having a preheating zone and at least one subsequent zone, a transport device for transporting the products to be heated from the preheating zone into the subsequent zone and one in the region of the preheating zone
  • Discharge device for discharging generated in the subsequent zone
  • the invention further relates to a method for operating a reheating furnace.
  • Such furnaces are also known as “reheating furnaces” or “second-heat furnaces” and are described, for example, in WO 02/097348 A1, US 2004/0259047 A1 or US Pat. No. 6,290,492 B1. They serve for reheating a metallic blank obtained by continuous casting, for example (hereinafter referred to as "product” or “thermal material”) after solidification from the melt and before a subsequent mechanical deformation, such as forging or rolling; In the reheating furnaces no heat treatment of the products takes place.
  • the thermal material which is usually present at a temperature of less than 400 ° C. passes successively through several zones in which it is brought to its final temperature of, for example, 750.degree. C. to 1500.degree. C. required for forming. From a furnace entrance from the Wärmgut is thereby first transported through a so-called preheating or convection zone in which it comes into hot contact with hot flue gas in the, from
  • Combustion processes in one or more subsequent zones are Combustion processes in one or more subsequent zones.
  • heating zone or as a “compensation zone”, wherein in each case a plurality of heating zones and / or
  • Balancing zones can be present.
  • the heating zone in the known reheating furnaces, the greatest energy input is used to heat the products, while in the preheating zone the high temperature of the flue gases generated in the heating zone is used to preheat the products.
  • the compensation zone is used in particular to ensure that the heat from the surface The products are evenly and homogeneously distributed inside the products before the products leave the kiln at the exit of the kiln for subsequent forming.
  • Both heating and compensation zones are equipped with a number of burners, which are usually operated with air as the oxidant and as
  • Ceiling burners are installed in the loft or as front burners in the side walls of the furnace. These burners are designed in such a way that the flames they emit do not touch the surface of the products to be heated, because if the heat is too high, there is a risk that the surface of the material will be oxidised, thereby reducing the quality of the products. Instead, these burners fuel the furnace atmosphere above the Wärmguts with a in the
  • Preheating zone is installed in the area of the furnace inlet and at the same time controls the furnace pressure.
  • Reheating furnaces have a high energy consumption and sometimes significant emissions of pollutants, especially nitrogen oxides on.
  • WO 02/097348 A1 it is proposed in WO 02/097348 A1 to install several burners in the region of the preheating zone of a reheating furnace which use an oxidizing agent with a higher oxygen content than air.
  • WO 2002/021061 A1 it is also proposed in WO 2002/021061 A1 to install at least one additional burner, which is operated with an oxygen-rich oxidizing agent, to increase the thermal output.
  • This burner can be mounted in a zone in which no burner was previously available, so for example, the preheating zone, or it replaces a fuel-air burner in the heating zone.
  • the invention is therefore based on the object, a furnace for the
  • the preheating zone is at least partially equipped with fuel-oxygen burners, which are designed so that during operation of the device, the fuel gases flowing out of them form a flame that reaches the surface of the products.
  • so-called “direct flame impingement” are thus installed in at least one section of the preheating zone, by means of which the products passing through this region are directly exposed to the burner flame.
  • direct application of flame there is a high efficiency in the heat transfer, which makes it possible to supply a large part of the total heat to be supplied to the heat already in the preheating area.
  • the performance of the burners in the subsequent zone or the subsequent zones can be set, so that a total of
  • the preheating zone in the transport direction of the products downstream zones are considered, in particular one or more heating and / or one or more balancing zone / n. Since the installed in the preheating zone burners are designed as oxyfuel burner, which with a oxygen-rich oxidant with, for example, 40% by volume of oxygen, preferably greater than 90% by volume of oxygen and more are operated, there is only a small amount of additional
  • Flue gas which is then withdrawn together with the flue gas from the following zones on the trigger device.
  • the very early and intensive heating of the heat in the preheating zone further leads to the task of the subsequent zone (s) consists primarily of producing a very homogeneous temperature distribution in the products. Consequently, the burners of the subsequent zones are designed as a fuel-air burner, the hot flue gas with his due to his
  • the rapid heating of the products already in the preheating zone and the early onset of the temperature equalization phase also allows faster passage of the products through the oven compared to prior art furnaces, thereby reducing the risk of scaling of the product surface.
  • a particularly advantageous embodiment of the invention provides that the installed in the preheating, directly acting oxygen-fuel burner are designed as flameless burner.
  • Flameless burners are to be understood here as meaning those burners in which flameless operation, ie conversion of the fuel gases, is possible without the formation of a visible flame front Flameless operation of the burners in the preheating zone leads to a uniform application of thermal energy to the surface of the thermal material.
  • due to the strong current of the combustion gases leaving the burner in flameless operation the flow of fuel passed through the preheating zone, from combustion to subsequent combustion Zone-derived flue gases is strongly deflected towards the products.
  • the direct acting oxygen-fuel burner are designed as flameless burner.
  • Reheating ovens due to the thermal contact of the products with the flue gases in the preheating zone is recorded.
  • Flameless operation in particular, allows heat transfer to the products that is so efficient that the temperature of the flue gases as the preheat zone passes during flameless operation of the burners decreases, thus giving the flue gases more heat to the products than they do from the flame of the burners receive.
  • a preferred development of the invention provides that the burners of at least the preheating zone are at least partially installed in the area of the furnace roof and substantially perpendicular, ie between 80 ° and 100 °, preferably 90 ° to
  • the burners preferably recessed in the furnace roof are designed in such a way that the flame generated by them overcomes the distance between the furnace roof and the surface of the material to be heated, which in some furnaces may well be between 1 m and 2 m, and the products directly
  • oxygen-fuel burners may also be installed in the sidewalls and / or in the floor area of the preheat zone, which directly apply the heat.
  • the burners installed in the preheating zone form a field of a plurality of burners distributed uniformly over the furnace roof.
  • the burners arranged in this way allow very uniform heating of the thermal material, especially in flameless operation.
  • the burner can be controlled individually to allow a targeted exposure of the Wärmguts.
  • the burners are in the preheating zone and / or in the
  • a control unit individually or In groups controlled by a control unit.
  • the burners can be switched on or off as required individually or in groups, or their performance can be regulated.
  • the control unit regulates in particular the heat input via the individual burners after one
  • pre-installed program and / or depending on measured values, for example, the temperature of the Wärmguts and / or a
  • Pollutant concentration in the flue gas and / or the path of a product to be heated through the furnace chamber By means of a control unit and the process temperature, for example, regulated between 750 ° C and 1500 ° C and the combustion ratio of the burner in the preheating zone and / or in the
  • Reheating furnace in which products to be heated successively pass through a preheating zone and at least one subsequent zone of a furnace chamber of the reheating furnace and thereby in thermal contact with in the
  • the burners are operated flameless in the preheating zone.
  • the surface of the heat is heated evenly and without the risk of local overheating.
  • Fig. 1 A reheating furnace according to the invention in longitudinal section
  • the furnace 1 shown in Fig. 1 comprises a furnace chamber 2, in which metallic
  • the furnace chamber 2 comprises an inlet 3, through which the products 4 to be heated are transported into the interior of the furnace chamber 2, and an outlet 5, through which the heated products 4 leave the furnace chamber 2.
  • the products 4 are transported by means of a transport device 6 through the furnace chamber 2 and pass through several zones 8, 9, 10, 1 1, namely a preheating zone 8, a first heating zone 9, a second heating zone 10 and a balancing zone 1 1.
  • Reheating furnace is to be understood merely as an example, in particular, only one or three or more heating zones can be provided.
  • Transport direction 12 of the products 4 through the furnace chamber 2 is indicated in Fig. 1 by an arrow.
  • the two heating zones 9, 10 and the balancing zone 1 1 are with - in
  • each of the zones 9, 10, 1 1 is a field of a plurality of in the respective ceiling region of the zone 9, 10, 1 1 uniformly, ie at equal distances from each other, distributed burners 14 are provided.
  • the number and spacing of the burners can be the same or different in all zones.
  • Furnace room 2 regulated.
  • the burners 14, which are preferably constructed substantially identically in the heating zones 9, 10 and in the equalization zone 11, are preferably burners, by means of which a gaseous, liquid or solid fuel,
  • coal dust, oil or natural gas is burned with air as the oxidant. They are built so that the flames emanating from them are so wide and short shaped that the area of the furnace chamber 2 before the respective
  • Burners of this type are described, for example, in WO 02/0973348 A1.
  • a field of a plurality of burners 18 arranged in the region of the furnace roof 17 of the preheating zone 8 is installed.
  • the burners 18 are oxy-fuel burners in which a liquid or gaseous fuel with oxygen or an oxygen-rich gas with at least 40 vol .-% oxygen, preferably greater than 90 vol .-% oxygen is burned.
  • the burner 18 are directed with their outlets 19 vertically downwards, ie at an angle of approximately 90 ° to the transport direction 6 of the products 4.
  • the burners 18 are designed so that the flame emanating from them is sufficiently long to touch the surface of the products, so they are so-called "DFI burners", and they are also suitable for flameless operation are described, for example, in WO 2008/092763 Al.Other burners 18 of the type mentioned can-not shown here-be arranged in the side walls of the preheating zone 8 and permit lateral direct application of the products 4. Also, burners 18 below the transport level of the products 4 are arranged, and heat the products 4 from below, are conceivable within the scope of the invention, as long as the products 4 can be heated directly with them.
  • the products 4 are transported by means of the transport device 6 from the inlet 3 of the furnace chamber 2 to the outlet 5.
  • a solid, gaseous or liquid fuel is burned with air, without the flame generated thereby touching the surface of the products.
  • the resulting from combustion mainly of carbon dioxide, water vapor and nitrogen hot flue gases are in the
  • Preheating zone 8 out come here with the respective zone passing through products in contact and heat them on. Subsequently, the flue gases are deducted from the discharge device 1 6.
  • the nitrogen serves the air supplied to the burners 14 as the oxidant as
  • the products 4 are additionally by direct
  • a reaction zone 20 is formed, which extends from the outlets 19 of the burners 18 to the surface of the products 4 and within which the combustion reaction takes place. Due to the strong flow of ejected from the burners 18 Fuel gases during flameless operation, the flowing out of the zones 9, 10, 1 1 flue gases are deflected towards the products 4, as indicated by the arrow 22, resulting in improved heat transfer from these flue gases to the products 4.
  • Reheating furnace according to the prior art can be shortened.
  • the operation of the burners 14, 18 is monitored by a control unit, not shown here, which in particular the supply of fuel and oxidizing agent to each burner 14, 18 in response to a predetermined
  • Burner 18 are switched on or off individually or in groups, depending on whether there is a product below them or not. Likewise, the power of the burners 14, 18 and the distribution of the heat energy to be transmitted to the burners 14, 18 can be controlled, for example, as a function of a measured temperature, and / or material parameters that are downstream of the furnace 1, for example before or during a mechanical deformation process of the products heated in the furnace 1 4 measured and used as a control parameter for controlling the burner 14, 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Tunnel Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

Dans des fours de préchauffage selon l'état de la technique, les produits à réchauffer traversent successivement une zone de préchauffage ainsi qu'une ou plusieurs zones de chauffage ou d'équilibrage, dans lesquelles les produits sont amenés progressivement à leur température finale déterminée pour la transformation ultérieure. Pour raccourcir la durée de séjour des produits dans la chambre du four et ainsi réduire le risque d'un calaminage de la surface du produit, selon l'invention, la zone de préchauffage est équipée au moins par sections de brûleurs à combustible-oxygène, qui sont conçus de manière telle que les gaz de combustion qui y entrent forment une flamme qui atteint la surface des produits lors du fonctionnement du dispositif. Grâce à la sollicitation directe par les flammes, l'efficacité du transfert de chaleur est augmentée et on obtient ainsi un raccourcissement de la durée de séjour des produits.
EP16733910.0A 2015-07-16 2016-06-23 Dispositif et procédé pour réchauffer des produits métalliques Withdrawn EP3322953A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015009194.8A DE102015009194A1 (de) 2015-07-16 2015-07-16 Vorrichtung und Verfahren zum Wiedererwärmen metallischer Produkte
PCT/EP2016/064575 WO2017009020A1 (fr) 2015-07-16 2016-06-23 Dispositif et procédé pour réchauffer des produits métalliques

Publications (1)

Publication Number Publication Date
EP3322953A1 true EP3322953A1 (fr) 2018-05-23

Family

ID=56296780

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16733910.0A Withdrawn EP3322953A1 (fr) 2015-07-16 2016-06-23 Dispositif et procédé pour réchauffer des produits métalliques

Country Status (5)

Country Link
EP (1) EP3322953A1 (fr)
CN (1) CN107923709A (fr)
DE (1) DE102015009194A1 (fr)
MA (1) MA43067A (fr)
WO (1) WO2017009020A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020028904A1 (fr) * 2018-08-03 2020-02-06 Wisys Technology Foundation, Inc. Four à impact sans flamme

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2064538T3 (es) * 1990-06-29 1995-02-01 Wuenning Joachim Procedimiento y dispositivo para la combustion de combustible en un recinto de combustion.
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
WO2002097348A1 (fr) 2001-05-30 2002-12-05 L'air Liquide, Directoire Et Conseil De Surveillancepour L'etude Et L'exploitation Des Procedes Procede de combustion pour la reduction de nox dans des fours de rechauffage
FR2829232B1 (fr) 2001-09-06 2004-08-20 Air Liquide Procede pour ameliorer le profil de temperature d'un four
PL2118565T5 (pl) 2007-02-02 2020-03-31 Messer Austria Gmbh Palnik
ES2460071T3 (es) * 2012-03-27 2014-05-13 Linde Aktiengesellschaft Método para calentar una placa o bloque de metal
US9122968B2 (en) * 2012-04-03 2015-09-01 X-Card Holdings, Llc Information carrying card comprising a cross-linked polymer composition, and method of making the same

Also Published As

Publication number Publication date
DE102015009194A1 (de) 2017-01-19
MA43067A (fr) 2018-05-23
CN107923709A (zh) 2018-04-17
WO2017009020A1 (fr) 2017-01-19

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