EP0321611A1 - Furnace tube for a radiation heating tube of an industrial oven - Google Patents

Furnace tube for a radiation heating tube of an industrial oven Download PDF

Info

Publication number
EP0321611A1
EP0321611A1 EP87202604A EP87202604A EP0321611A1 EP 0321611 A1 EP0321611 A1 EP 0321611A1 EP 87202604 A EP87202604 A EP 87202604A EP 87202604 A EP87202604 A EP 87202604A EP 0321611 A1 EP0321611 A1 EP 0321611A1
Authority
EP
European Patent Office
Prior art keywords
tube
flame tube
flame
hollow cylindrical
cylindrical parts
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Withdrawn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
EP87202604A
Other languages
German (de)
French (fr)
Inventor
Franco Andreoli
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP87202604A priority Critical patent/EP0321611A1/en
Priority to IT882943A priority patent/IT8802943A0/en
Publication of EP0321611A1 publication Critical patent/EP0321611A1/en
Withdrawn legal-status Critical Current

Links

Images

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
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/068—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by radiant tubes, the tube being heated by a hot medium, e.g. hot gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B7/00—Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed inside one or more furnace tubes built-in in the boiler body
    • F22B7/16—Component parts thereof; Accessories therefor, e.g. stay-bolt connections
    • F22B7/20—Furnace tubes
    • 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 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • 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
    • 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
    • F27D99/0035—Heating indirectly through a radiant surface

Definitions

  • the invention relates to a flame tube for a radiant heating tube of an industrial furnace, which is formed from refractory fibrous material, or is composed of a plurality of hollow cylindrical parts made of refractory fibrous material which are connected to one another or simply arranged one behind the other.
  • the previously known flame tubes of radiant heating tubes are either metallic or made of compact (sintered) ceramic materials.
  • the metallic flame tubes have a limited temperature resistance, while those made of sintered ceramic refractory materials are susceptible to cracking, as a result of the much higher internal temperature than the outside temperature, stresses arise due to the different thermal expansion.
  • the invention relates to a flame tube, which has a very long service life due to the production from high-temperature-resistant fiber materials.
  • the most important technical advantage that can be achieved by this design is that the flame tube thus realized, thanks to the elasticity of the fiber material, does not suffer from cracks due to heat impacts or very high temperature differences between the inner and outer walls, and therefore has a higher thermal load-bearing capacity than with conventional designs having.
  • Another advantage is that the flame tube in this version, thanks to the typical low density of the fiber materials, is very light and easy to handle. Furthermore, the reduced heat content allows the heating-up time and the heat losses in the furnaces for intermittent operation to be reduced.
  • Flame tubes according to this invention can also be produced from a plurality of hollow cylindrical parts made of fibrous material which are connected to one another or arranged one behind the other.
  • the outermost ends of the hollow cylindrical parts can be formed in such a way that a simple coupling and sticking together for sealing is possible.
  • Wall thickness and fiber properties of the hollow cylindrical parts mentioned can also be different in order to achieve uniform heat emission along the flame tube.
  • radial passages for returning the exhaust gases into the ring-shaped exhaust gas guide can be provided in the end part of such a flame tube.
  • spacer ribs made of metal or fiber materials can easily be attached or fitted to the inner wall of the jacket tube.
  • a jet pipe made of heat-resistant steel in U-type (2) is used through a furnace wall (1), with the burner (3), with the feed line (4) of the fuel, generally fuel gas, and with an air duct (5) surrounding it coaxially.
  • the burner (3) opens into the so-called flame tube (6), a tube section which consists of one or more hollow cylindrical parts made of fiber material.
  • the length of the flame tube (6) corresponds approximately to the flame length and should in any case expediently reach the point where the combustion is complete.
  • An annular shoulder (7) is provided to support the flame tube.
  • a jacket radiant tube (8) made of heat-resistant steel is inserted through the furnace wall (1), with a coaxially arranged inner tube (9) also made of heat-resistant steel, which with the inner wall of the jacket tube (8) forms an annular gap ( 10) limited, which serves as an exhaust gas guide.
  • the burner (3) opens into the so-called flame tube (6 ⁇ ), a tube section which consists of one or more hollow-cylindrical fibers made of fiber material, with a structure similar to that in FIG.
  • the flame tube (6 ⁇ ) sits on the end face of the casing tube (8), while the metallic inner tube (9) of FIG. 2 has been eliminated.
  • the flame tube consists of several hollow cylindrical parts arranged one behind the other, these can be shaped in such a way that the connection is made by pushing in and gluing the outermost ends (11) together.
  • longitudinal ribs (12) abutting the inner wall of the jacket tube are provided, between which longitudinal channels (13) serving for exhaust gas removal remain free.
  • the flame tube (6 ⁇ ) has openings (14) for the passage of the exhaust gases into the longitudinal channels (13).

Abstract

Inside a protective tube (8) made of heat resistant steel, supported by a furnace wall, and carrying fuel and air supply elements (4,5) at its outer end is a burner (3) followed by a flame tube (6). This is made of sections of ceramic fibre material. The ends of the tube sections are shaped so that they interlock with each other to form the flame tube and adhesive is sued at the joints to form a seal. The wall thickness and heat resistance of the section can vary. The flame tube can be supported inside the steel tube by longitudinal ribs, forming a space (13) for combustion gases discharged through holes (14) through the wall of the outer end of the flame tube.

Description

Die Erfindung betrifft ein Flammrohr fuer ein Strahlheiz­rohr eines Industrieofens, das aus feuerfestem Faserstoff geformt ist,oder aus mehreren miteinander verbundenen bzw. einfach hintereinander angeordneten hohlzylindrischen Teilen aus feuerfestem Faserstoff zusammengesetzt ist.The invention relates to a flame tube for a radiant heating tube of an industrial furnace, which is formed from refractory fibrous material, or is composed of a plurality of hollow cylindrical parts made of refractory fibrous material which are connected to one another or simply arranged one behind the other.

Die bis jetzt bekannten Flammrohre von Strahlheizrohre sind entweder metallisch oder aus kompakten (gesinterten) keramischen Werkstoffen hergestellt. Die metallischen Flamm­rohre besitzen eine begrenzte Temperaturbestaendigkeit, waehrend diejenigen aus gesinterten keramischen feuer­festen Materialien sind rissanfaellig da, infolge der gegen­ueber der Aussentemperatur wesentlich hoeheren Innen­temperatur, Spannungen wegen der unterschiedlichen thermi­schen Ausdehnung auftreten.The previously known flame tubes of radiant heating tubes are either metallic or made of compact (sintered) ceramic materials. The metallic flame tubes have a limited temperature resistance, while those made of sintered ceramic refractory materials are susceptible to cracking, as a result of the much higher internal temperature than the outside temperature, stresses arise due to the different thermal expansion.

Die Erfindung betrifft ein Flammrohr, welches durch die Herstellung aus hochtemperaturbestaendigen Faserstoffen, eine sehr hohe Lebensdauer besitzt.
Der wichtigste durch diese Ausfuehrung erzielbare techni­sche Vorteil besteht darin, dass das so verwirklichte Flamm­rohr, dank der Elastizitaet des Faserstoffes, an Rissbild­ungen infolge von Waermestossen oder auch sehr hohen Temperaturunterschieden zwischen Innen- und Aussenwandung nicht leidet und daher eine hoehere thermische Belast­barkeit als bei ueblichen Ausfuehrungen aufweist.
Ein weiterer Vorteil besteht darin, dass das Flammrohr in dieser Ausfuehrung, dank der typischen niedrigen Dichte der Faserstoffen, sehr leicht und handlich ist. Ferner er­laubt der ermaessigte Waermeinhalt die Aufheizzeit und die Waermeverluste bei den Oefen fuer intermittierenden Betrieb zu senken.
Flammrohre nach dieser Erfindung koennen auch aus mehreren miteinander verbundenen bzw. hintereinander angeordneten hohlzylindrischen Teilen aus Faserstoff gefertigt werden. Zur Verbindung koennen die aeussersten Enden der hohl­zylindrischen Teile so gebildet werden dass eine einfache Kupplung und das Zusammenkleben zur Abdichtung ermoeglicht wird.The invention relates to a flame tube, which has a very long service life due to the production from high-temperature-resistant fiber materials.
The most important technical advantage that can be achieved by this design is that the flame tube thus realized, thanks to the elasticity of the fiber material, does not suffer from cracks due to heat impacts or very high temperature differences between the inner and outer walls, and therefore has a higher thermal load-bearing capacity than with conventional designs having.
Another advantage is that the flame tube in this version, thanks to the typical low density of the fiber materials, is very light and easy to handle. Furthermore, the reduced heat content allows the heating-up time and the heat losses in the furnaces for intermittent operation to be reduced.
Flame tubes according to this invention can also be produced from a plurality of hollow cylindrical parts made of fibrous material which are connected to one another or arranged one behind the other. For connection, the outermost ends of the hollow cylindrical parts can be formed in such a way that a simple coupling and sticking together for sealing is possible.

Wandstaerke und Faserstoffeigenschaft der genannten hohlzylindrischen Teilen koennen auch unterschiedlich sein um eine gleichmaessige Waermeabgabe laengs des Flammrohres zu erreichen.
Im Abschlussteil eines derartigen Flammrohres koennen, bei Verwendung in Mantelstrahlheizrohren,radiale Durchlaesse zum Rueckkehr der Abgase in die ringfoermigen Abgas­fuehrung vorgesehen werden.
Ausserhalb eines derartigen Flammrohres kann man leicht an der Innenwandung des Mantelrohres anliegenden Distanz­rippen aus Metall oder aus Faserstoffen anbauen bzw. einsetzen.Wall thickness and fiber properties of the hollow cylindrical parts mentioned can also be different in order to achieve uniform heat emission along the flame tube.
In the end part of such a flame tube, radial passages for returning the exhaust gases into the ring-shaped exhaust gas guide can be provided when used in jacket radiant heating tubes.
Outside of such a flame tube, spacer ribs made of metal or fiber materials can easily be attached or fitted to the inner wall of the jacket tube.

In der Zeichnungen sind Ausfuehrungsbeispiele des Gegenstandes der Erfindung dargestellt.

  • Fig.1 zeigt den Laengsschnitt eines Flammrohres in einem am Ende offenen Strahlrohr, nur als Beispiel U-foermig gebogenen, welches aber anders ausgefuehrt sein kann.
  • Fig.2 zeigt den Laengsschnitt eines Flammrohres in einem Mantelstrahlheizrohr.
  • Fig.3 zeigt den Laengsschnitt eines Flammrohres in einem Mantelstrahlheizrohr fuer haengenden Einbau.
  • Fig.4 zeigt einen Querschnitt gemaess Linie A-A des Rohres der Fig.3.
Exemplary embodiments of the subject matter of the invention are shown in the drawings.
  • 1 shows the longitudinal section of a flame tube in a jet tube which is open at the end, bent as a U-shape only as an example, but which can be designed differently.
  • Fig.2 shows the longitudinal section of a flame tube in a jacket radiant tube.
  • Fig.3 shows the longitudinal section of a flame tube in a jacket radiant tube for hanging installation.
  • 4 shows a cross section along line AA of the tube of FIG. 3.

Bei der Darstellung der Fig.1, ist durch eine Ofenmauer (1) ein Strahlrohr aus hitzebestaendigem Stahl in U-Bauart (2) eingesetzt, mit dem Brenner (3),mit der Zufuehrleitung (4) des Brennstoffes, im allgemeinen Brenngas, und mit einer diese koaxial umgebenden Luftfuehrung (5). Der Brenner (3) muendet in das sogenannte Flammrohr (6), eine Rohrstrecke welche aus einem oder aus mehreren hohlzylindrischen Teilen aus Faserstoff besteht.
Die Laenge des Flammrohres (6) entspricht etwa der Flammenlaenge und soll auf jedem Fall zwecksmaessigerweise bis zum Punkt gelangen wo die Verbrennung vollstaendig ist. Zur Abstuetzung des Flammrohres ist ein Ringschulter (7) vorgesehen.In the representation of Fig.1, a jet pipe made of heat-resistant steel in U-type (2) is used through a furnace wall (1), with the burner (3), with the feed line (4) of the fuel, generally fuel gas, and with an air duct (5) surrounding it coaxially. The burner (3) opens into the so-called flame tube (6), a tube section which consists of one or more hollow cylindrical parts made of fiber material.
The length of the flame tube (6) corresponds approximately to the flame length and should in any case expediently reach the point where the combustion is complete. An annular shoulder (7) is provided to support the flame tube.

Bei der Darstellung der Fig.2, ist durch die Ofenmauer (1) ein Mantelstrahlheizrohr (8) aus hitzebestaendigem Stahl eingesetzt, mit einem koaxial angeordneten Innenrohr (9) ebenfalls aus hitzebestaendigem Stahl, das mit der Innenwandung des Mantelrohres (8) einen Ringspalt (10) begrenzt, der als Abgasfuehrung dient.
Der Brenner (3) muendet in das sogenannte Flammrohr (6ʹ), eine Rohrstrecke welche aus einem oder aus mehreren hohlzylindrischen Telen aus Fasersstoff besteht, mit einem der Fig.1 aehnlichen Aufbau.
Bei der Ausfuehrungform nach Fig.3, die grundsaetzlich derjenigen nach Fig.2 entspricht, sitzt das Flammrohr (6ʺ) auf der Stirnflaeche des Mantelrohres (8), waehrend das metallische Innenrohr (9) der Fig.2 in Wegfall gekommen ist. Wenn das Flammrohr aus mehreren hintereinander angeordnet­en hohlzylindrischen Teilen besteht, koennen diese so ge­formt sein dass die Verbindung durch Einschieben und Zu­sammenkleben der aeussersten Enden (11) erfolgt.
Ausserhalb des Flammrohres sind an der Innenwandung des Mantelrohres anliegenden Laengsrippen (12) vorgesehen, zwischen denen der Abgasabfuhr dienende Laengskanaele (13) frei bleiben.
In dem zum Brenner (3) entgegengesetzten Bereich weist das Flammrohr (6ʺ) Oeffnungen (14) auf, zum Durchlass der Abgase in die Laengskanaele (13).In the illustration in FIG. 2, a jacket radiant tube (8) made of heat-resistant steel is inserted through the furnace wall (1), with a coaxially arranged inner tube (9) also made of heat-resistant steel, which with the inner wall of the jacket tube (8) forms an annular gap ( 10) limited, which serves as an exhaust gas guide.
The burner (3) opens into the so-called flame tube (6ʹ), a tube section which consists of one or more hollow-cylindrical fibers made of fiber material, with a structure similar to that in FIG.
In the embodiment according to FIG. 3, which basically corresponds to that according to FIG. 2, the flame tube (6ʺ) sits on the end face of the casing tube (8), while the metallic inner tube (9) of FIG. 2 has been eliminated. If the flame tube consists of several hollow cylindrical parts arranged one behind the other, these can be shaped in such a way that the connection is made by pushing in and gluing the outermost ends (11) together.
Outside the flame tube, longitudinal ribs (12) abutting the inner wall of the jacket tube are provided, between which longitudinal channels (13) serving for exhaust gas removal remain free.
In the area opposite the burner (3), the flame tube (6ʺ) has openings (14) for the passage of the exhaust gases into the longitudinal channels (13).

Claims (5)

1. Flammrohr fuer ein Strahlrohr eines Industrieofens, das mindestens fuer die Flammenlaenge aus einem oder aus mehreren hintereinander angeordneten hohlzylindrischen Teilen besteht, dadurch gekennzeichnet, dass die hohl­zylindrischen Teile aus hochtemperaturbestaendigen Faser­stoffen geformt sind.1. Flame tube for a radiant tube of an industrial furnace, which consists at least for the flame length of one or more hollow cylindrical parts arranged one behind the other, characterized in that the hollow cylindrical parts are formed from high-temperature-resistant fibrous materials. 2. Flammrohr nach Anspruch 1, dadurch gekennzeichnet, dass die hintereinander angeordneten hohlzylindrischen Teile so geformt sind dass sie zu zweien an den aeussersten Enden durch Einschub verbunden und zur Abdichtung geklebt werden koennen.2. Flame tube according to claim 1, characterized in that the hollow cylindrical parts arranged one behind the other are shaped such that they can be connected in pairs at the extreme ends by insertion and glued for sealing. 3. Flammrohr nach einem der Ansprueche 1 oder 2, dadurch gekennzeichnet, dass Wandstaerke und Waermeleitzahl der Bestandteile unterschiedlich sind.3. Flame tube according to one of claims 1 or 2, characterized in that the wall thickness and thermal conductivity of the components are different. 4. Flammrohr nach einem der Ansprueche 1 bis 3, zur Verwendung in einem Mantelstrahlheizrohr mit einer das Flammrohr ringfoermig umgebenden Abgasfuehrung, dadurch gekennzeichnet, dass in dem zum Brenner entgegengesetzten Bereich radiale Oeffnungen zur Abgasfuehrung vorgesehen sind.4. Flame tube according to one of claims 1 to 3, for use in a radiant tube with an exhaust gas guide surrounding the flame tube in the form of a ring, characterized in that radial openings for exhaust gas guidance are provided in the region opposite the burner. 5. Flammrohr nach einem der Ansprueche 1 bis 4, dadurch gekennzeichnet, dass die Aussenflaeche an der Innenwandung des Mantelrohres anliegenden Distanzrippen aus Metall oder aus Faserstoffen aufweist.5. Flame tube according to one of claims 1 to 4, characterized in that the outer surface on the inner wall of the casing tube has spacing ribs made of metal or fiber materials.
EP87202604A 1987-12-22 1987-12-22 Furnace tube for a radiation heating tube of an industrial oven Withdrawn EP0321611A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP87202604A EP0321611A1 (en) 1987-12-22 1987-12-22 Furnace tube for a radiation heating tube of an industrial oven
IT882943A IT8802943A0 (en) 1987-12-22 1988-06-13 FLAME TUBE FOR A RADIANT TUBE OF AN INDUSTRIAL OVEN.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87202604A EP0321611A1 (en) 1987-12-22 1987-12-22 Furnace tube for a radiation heating tube of an industrial oven

Publications (1)

Publication Number Publication Date
EP0321611A1 true EP0321611A1 (en) 1989-06-28

Family

ID=8197729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87202604A Withdrawn EP0321611A1 (en) 1987-12-22 1987-12-22 Furnace tube for a radiation heating tube of an industrial oven

Country Status (2)

Country Link
EP (1) EP0321611A1 (en)
IT (1) IT8802943A0 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5348468A (en) * 1990-11-02 1994-09-20 Chamottewaren-Und Thonofenfabrick Aug. Rath Jun. Aktiengesellschaft Fiber brick and burner with such fiber brick
EP0889297A1 (en) * 1997-07-03 1999-01-07 Ruhrgas Aktiengesellschaft Installation for melting and/or holding a metallic bath at temperature
EP1167877A1 (en) * 2000-06-29 2002-01-02 Gas Technology Institute Single-ended self-recuperated radiant tube annulus system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3336716A (en) * 1963-07-10 1967-08-22 Johns Manville Furnace combustion chamber with a transverse composition differential
DE2940245A1 (en) * 1979-10-04 1981-04-16 Brown, Boveri & Cie Ag, 6800 Mannheim Flame tube for industrial furnace radiant-heating tube - is highly heat-resistant ceramic lattice frame with more conductive ceramic in openings
EP0079594A1 (en) * 1981-11-11 1983-05-25 LAFARGE REFRACTAIRES Société Anonyme Boiler for central heating
EP0191910A1 (en) * 1984-12-28 1986-08-27 Aichelin GmbH Ceramic fire tube for a radiant heating cover tube of an industrial burner
DE8631630U1 (en) * 1986-11-26 1987-03-05 Mann, Wilhelm, Dipl.-Ing., 6301 Allendorf, De

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3336716A (en) * 1963-07-10 1967-08-22 Johns Manville Furnace combustion chamber with a transverse composition differential
DE2940245A1 (en) * 1979-10-04 1981-04-16 Brown, Boveri & Cie Ag, 6800 Mannheim Flame tube for industrial furnace radiant-heating tube - is highly heat-resistant ceramic lattice frame with more conductive ceramic in openings
EP0079594A1 (en) * 1981-11-11 1983-05-25 LAFARGE REFRACTAIRES Société Anonyme Boiler for central heating
EP0191910A1 (en) * 1984-12-28 1986-08-27 Aichelin GmbH Ceramic fire tube for a radiant heating cover tube of an industrial burner
DE8631630U1 (en) * 1986-11-26 1987-03-05 Mann, Wilhelm, Dipl.-Ing., 6301 Allendorf, De

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5348468A (en) * 1990-11-02 1994-09-20 Chamottewaren-Und Thonofenfabrick Aug. Rath Jun. Aktiengesellschaft Fiber brick and burner with such fiber brick
EP0889297A1 (en) * 1997-07-03 1999-01-07 Ruhrgas Aktiengesellschaft Installation for melting and/or holding a metallic bath at temperature
EP1167877A1 (en) * 2000-06-29 2002-01-02 Gas Technology Institute Single-ended self-recuperated radiant tube annulus system

Also Published As

Publication number Publication date
IT8802943A0 (en) 1988-06-13

Similar Documents

Publication Publication Date Title
DE3422229C2 (en) Industrial burners for gaseous or liquid fuels
CA1159353A (en) Recuperative burners
DE2807192C2 (en) Gas burner
EP0321611A1 (en) Furnace tube for a radiation heating tube of an industrial oven
EP0191910B1 (en) Ceramic fire tube for a radiant heating cover tube of an industrial burner
DE4132235C1 (en)
DE2258245C3 (en) Tunnel furnace
DE2713461C2 (en) Horizontal coking furnace
JPH06229522A (en) Radiant tube burner
DE1501970A1 (en) Burner for oven
DE3915957A1 (en) COVERED HEATING PIPE
DE4339012A1 (en) Externally mixing flat face burner
DE2032689A1 (en) chimney
DE4308017C1 (en) Water heater with catalytic burner and method for its operation
DE1551762B1 (en) Flame tube for a radiant heating tube of an industrial furnace
DE1232304B (en) Radiant heating tube for industrial furnaces
EP1007882B1 (en) Coating for a burner nozzle
DE3005257A1 (en) BURNER MUFFLE STONE
DE1551762C (en) Flame tube for a radiant heating tube of an industrial furnace
AT165291B (en) Metallurgical furnace, especially steel melting furnace
DE3042305C2 (en) Use for stoves or boilers
DE119767C (en)
DE290267C (en)
DE3518348A1 (en) Radiant heating jacket pipe
DE19536706A1 (en) Jacketed radiant heating tube e.g. for industrial furnace

Legal Events

Date Code Title Description
AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE ES FR GB NL

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE ES FR GB NL

RHK1 Main classification (correction)

Ipc: F23C 3/00

D17D Deferred search report published (deleted)
DA1 Application published (deleted)
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19891229