EP0383687A1 - Strahlungs-Röhrensystem für Heizöfen - Google Patents

Strahlungs-Röhrensystem für Heizöfen Download PDF

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Publication number
EP0383687A1
EP0383687A1 EP90400409A EP90400409A EP0383687A1 EP 0383687 A1 EP0383687 A1 EP 0383687A1 EP 90400409 A EP90400409 A EP 90400409A EP 90400409 A EP90400409 A EP 90400409A EP 0383687 A1 EP0383687 A1 EP 0383687A1
Authority
EP
European Patent Office
Prior art keywords
elbow
tubes
cold
radiant
tube
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
Application number
EP90400409A
Other languages
English (en)
French (fr)
Other versions
EP0383687B1 (de
Inventor
Bernard Dubreuil
Gérard Jodet
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.)
Fives Stein SA
Original Assignee
Stein Heurtey SA
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 Stein Heurtey SA filed Critical Stein Heurtey SA
Publication of EP0383687A1 publication Critical patent/EP0383687A1/de
Application granted granted Critical
Publication of EP0383687B1 publication Critical patent/EP0383687B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 
    • 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
    • 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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies

Definitions

  • the present invention relates to improvements made to the systems of radiant tubes used in particular in the furnaces for heating strips of metal products in the procession.
  • radiant tubes generally having a W configuration, also called a double pin, are generally used, these tubes ensuring the thermal transfer between the combustion gases emitted by a burner and the product to be heated, in particular a metal strip. continuously moving. The heat transfer takes place by radiation between the radiant tube system and the product to be heated and by convection / radiation inside the radiant tubes.
  • the combustion gases at the outlet of the radiant tube system have a temperature of around 1000 ° C while the temperature of the radiant tubes is on average 950 ° C with a local maximum of the order of 1050 ° C.
  • the present licensee has carried out an in-depth study of deformations by thermal expansions as well as of the network of constraints associated with these expansions, these constraints appearing during the heating of the radiant tubes and during operation in stabilized operation or not.
  • the aim of this study was to find the means making it possible to optimize the distribution of the stresses by taking into account the creep resistance of the materials which constitute the system of radiant tubes, this creep resistance varying strongly as a function of the temperature.
  • the present invention therefore relates to a system of radiant tubes which has been improved by taking account of the results of said study.
  • the invention relates to a system of radiant tubes of the double pin or W type used in heating furnaces, in particular in furnaces for heating metal strips in the runway, to effect the heat transfer between the combustion gases emitted by a burner and the products to be heated, characterized in that: - The burner is positioned in the lower branch of said tubes; - The cold elbow support device, in the upper part of the tubes is made in the form of a simple support; - the cold elbow and the hot elbow are connected to each other without an intermediate piece of the rod type and, - The intermediate elbow and the lower tube are connected to each other with an adjustable clearance between these two elements.
  • the simple support which supports the cold elbow is produced in the form of a console on which the cold elbow rests, before heating the radiant tube, the cold elbow rising to leave this support as soon as heating.
  • the cold elbow and the hot elbow are connected by means of brackets respectively from the foundry with its respective elbow, these brackets being interconnected using a key or the like.
  • the means ensuring the connection on the burner side between the intermediate elbow and the lower tube is produced using a tab from the foundry with this intermediate elbow on which is welded a stirrup-shaped part which can come '' press on the lower tube, an intermediate clearance being provided between the stirrup and the lower tube, the distribution of the stresses of the radiant tube being a function of the value of this intermediate clearance, and the resumption of the force generated by the intermediate elbow being provided by the inferior tube in the part where it is the coldest.
  • the heating furnace is used for the heat treatment of strips, in particular of metal strips 12, 12 ′ moving continuously in the furnace (process on parade).
  • the heating is carried out using radiant tubes whose system has been designated as a whole by the reference 10, this system having as known a configuration in W or double pin.
  • a burner 14 is provided outside the oven enclosure and the combustion gases emitted by this burner pass through the system of radiant tubes 10 before escaping to the atmosphere.
  • the radiant tubes therefore ensure the thermal transfer between the combustion gases emitted by the burner 14 and the product 12, 12 ′ to be heated.
  • the burner 14 is positioned on the lower branch of the system of radiant tubes, that is to say at the end of the lower tube 16 which constitutes the hot tube.
  • the elbow 18 which extends the hot tube 16 constitutes the hot elbow of the system 10.
  • the elbow 20 will be designated hereinafter intermediate elbow and the upper elbow 22 will be designated by cold elbow, this elbow opening onto the upper tube 24 which constitutes the tube cold radiant tube system 10.
  • the cold elbow is provided with a support device the function of which boils down to a simple press.
  • this simple support is produced in the form of a console 28 on which a support plate 26 can come to rest, made integral by any appropriate means with the cold elbow 22.
  • the elbow associated with the support is the cold elbow 22 in which the most important stresses are acceptable.
  • FIG. 3 the variation in the temperature of the tube system 10 is shown as a function of its length, and the position of the respective elbows 18, 20, 22 is plotted on the abscissa.
  • FIG. 4 the variation in the admissible creep stress as a function of the temperature of the tube system 10. This curve shows although the allowable stresses in the cold elbow region are much higher than those acceptable in the hot elbow. Such an arrangement is essential for optimizing the constraint network.
  • connection system between the hot elbow 18 and the cold elbow 22, this connection system being characterized essentially by the fact that it does not comprise any intermediate part (link).
  • the elbow 18 is provided with a square 32 coming directly from the foundry with this hot elbow 18 and likewise the cold elbow 22 is provided with a similar square 30 also come directly from foundry with this cold elbow 22.
  • the brackets 30 and 32 are obtained directly during the casting of the elbows of which they are respectively part. In no case should these brackets be added by welding to the elbows since such welds generate stress concentrations and risks of microcracking at locations where the stresses are maximum during operation.
  • brackets 30 and 32 are connected by means of a connecting piece which can be produced in the form of a key such as 34, the design being such that the games allow relative movements of the hot 18 and cold 22 elbows when warming up, during operation of the oven in stabilized operation and during transients (power variation of the system of radiant tubes 10).
  • the improved radiant tube system according to the present invention also comprises a connection between the intermediate elbow 20 and the hot lower tube 16, burner side 14.
  • a connection between the intermediate elbow 20 and the hot lower tube 16, burner side 14. Such a system visible in FIG. 1 and shown in more detail in FIGS. 7 and 8 is essential for optimizing the distribution of system constraints 10.
  • this connection system comprises a piece 36 in the shape of a tab, coming directly from the foundry with the intermediate elbow 20 (any welding between the elbow 20 and a connection piece such as 36 being prohibited for reasons indicated above with respect to the brackets 30 and 32) and a piece 38 in the shape of a stirrup which can be mounted on the lug 36 by welding since this lug does not support any stress.
  • connection by welding between the plate 36 and the part 38 in the shape of a stirrup is carried out after checking the intermediate clearance "j" between the stirrup 38 and the hot lower tube 16.
  • the subsequent distribution of the components of the system of radiant tubes 10 depends on the value of this infill. In fact, when the oven is warming up, the intermediate elbow 20 approaches the lower tube 16 up to the intermediate clearance "j" produced when cold and its movement is thus limited. This situation corresponds to a mapping of the distribution of the particular constraints for each infill set.
  • connection of the lower 16 and upper 24 tubes with the sheet metal of the furnace can be carried out by any suitable means and in particular by any conventional technique.
  • expansion bellows on one of the branches of the system of radiant tubes 10 brings here more drawbacks than advantages and under these conditions the invention plans to carry out the connection between the lower and upper tubes and the sheet metal of the furnace without using expansion bellows.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Resistance Heating (AREA)
  • Gas Burners (AREA)
  • Pipe Accessories (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Baking, Grill, Roasting (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Electric Stoves And Ranges (AREA)
  • Drying Of Solid Materials (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP90400409A 1989-02-17 1990-02-14 Strahlungs-Röhrensystem für Heizöfen Expired - Lifetime EP0383687B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8902117 1989-02-17
FR8902117A FR2643447B1 (fr) 1989-02-17 1989-02-17 Systeme de tubes radiants pour fours de chauffage

Publications (2)

Publication Number Publication Date
EP0383687A1 true EP0383687A1 (de) 1990-08-22
EP0383687B1 EP0383687B1 (de) 1994-06-08

Family

ID=9378900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90400409A Expired - Lifetime EP0383687B1 (de) 1989-02-17 1990-02-14 Strahlungs-Röhrensystem für Heizöfen

Country Status (10)

Country Link
US (1) US5042452A (de)
EP (1) EP0383687B1 (de)
JP (1) JPH0674881B2 (de)
AT (1) ATE107015T1 (de)
DE (2) DE69009519T2 (de)
ES (1) ES2017061T3 (de)
FR (1) FR2643447B1 (de)
GR (1) GR900300158T1 (de)
NO (1) NO177105C (de)
RU (1) RU1773299C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011044596A1 (de) * 2009-10-13 2011-04-21 Ebner Industrieofenbau Gesellschaft M.B.H. Vorrichtung zur wärmebehandlung von blechbändern
US8877120B2 (en) 2009-10-13 2014-11-04 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2685437B1 (fr) * 1991-12-23 1994-01-28 Stein Industrie Dispositif d'appui sur une charpente fixe d'une masse reliee en porte-a-faux a un element mobile.
US5370530A (en) * 1993-03-24 1994-12-06 Italimpianti Of America, Inc. Rolls for high temperature roller hearth furnaces
US5362230A (en) * 1993-03-24 1994-11-08 Italimpianti Of America, Inc. Rolls for high temperature roller hearth furnaces
JP3855369B2 (ja) * 1997-05-26 2006-12-06 Ｊｆｅスチール株式会社 ラジアントチューブの支持装置
US7487745B2 (en) * 2005-04-28 2009-02-10 Mark Rettig Boiler tube position retainer assembly
US7559294B2 (en) * 2007-04-26 2009-07-14 Babcock & Wilcox Power Generation Group Inc. End support configuration for steam tubes of a superheater or reheater
DE202008009065U1 (de) * 2008-07-04 2008-10-09 WS Wärmeprozesstechnik GmbH Strahlungsheizanordnung mit Verzugkompensation
JP6028595B2 (ja) * 2013-01-29 2016-11-16 新日鐵住金株式会社 ラジアントチューブを用いた加熱炉
EP3311073B1 (de) * 2016-09-07 2020-06-24 Doosan Lentjes GmbH Vorrichtung mit zirkulierendem wirbelbett
CN110748885A (zh) * 2019-11-18 2020-02-04 江苏优泽科技有限公司 一种辐射管

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB487764A (en) * 1937-03-01 1938-06-24 Surface Combustion Corp Improvements in heat radiating combustion flues for furnaces
US2204144A (en) * 1935-10-31 1940-06-11 Babcock & Wilcox Co Fluid heat exchange apparatus
US2652037A (en) * 1947-09-03 1953-09-15 Du Pont Heat exchange apparatus
GB1396796A (en) * 1972-07-21 1975-06-04 Skoda Np Heat radiating tube support
LU84040A1 (fr) * 1982-03-26 1983-11-17 Cockerill Sambre Sa Supports ameliores de corps de chauffe de fours de recuit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2695220A (en) * 1950-09-27 1954-11-23 Socony Vacuum Oil Co Inc Kiln
US3055349A (en) * 1959-05-11 1962-09-25 Babcock & Wilcox Co Tubular fluid heater and support therefor
CH420230A (de) * 1964-09-03 1966-09-15 Sulzer Ag Wärmeübertrager
US3385271A (en) * 1967-01-31 1968-05-28 Selas Corp Of America Tube heater
CH577117A5 (de) * 1974-04-29 1976-06-30 Sulzer Ag
JPH0226924Y2 (de) * 1985-05-28 1990-07-20
US4796690A (en) * 1985-11-18 1989-01-10 Foster Wheeler Energy Corporation Support system for heat exchange tube
US4878480A (en) * 1988-07-26 1989-11-07 Gas Research Institute Radiant tube fired with two bidirectional burners

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204144A (en) * 1935-10-31 1940-06-11 Babcock & Wilcox Co Fluid heat exchange apparatus
GB487764A (en) * 1937-03-01 1938-06-24 Surface Combustion Corp Improvements in heat radiating combustion flues for furnaces
US2652037A (en) * 1947-09-03 1953-09-15 Du Pont Heat exchange apparatus
GB1396796A (en) * 1972-07-21 1975-06-04 Skoda Np Heat radiating tube support
LU84040A1 (fr) * 1982-03-26 1983-11-17 Cockerill Sambre Sa Supports ameliores de corps de chauffe de fours de recuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011044596A1 (de) * 2009-10-13 2011-04-21 Ebner Industrieofenbau Gesellschaft M.B.H. Vorrichtung zur wärmebehandlung von blechbändern
CN102597621A (zh) * 2009-10-13 2012-07-18 艾伯纳工业筑炉有限公司 用于对金属板带进行热处理的设备
RU2506496C2 (ru) * 2009-10-13 2014-02-10 Эбнер Индустриофенбау Гезелльшафт М.Б.Х. Устройство для термической обработки рулонных полос
US8877120B2 (en) 2009-10-13 2014-11-04 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips

Also Published As

Publication number Publication date
JPH02254208A (ja) 1990-10-15
DE69009519D1 (de) 1994-07-14
FR2643447B1 (fr) 1991-10-04
ES2017061A4 (es) 1991-01-01
FR2643447A1 (fr) 1990-08-24
NO900763L (no) 1990-08-20
NO900763D0 (no) 1990-02-16
NO177105C (no) 1995-07-19
EP0383687B1 (de) 1994-06-08
GR900300158T1 (en) 1991-09-27
US5042452A (en) 1991-08-27
DE69009519T2 (de) 1994-09-29
DE383687T1 (de) 1991-01-17
ES2017061T3 (es) 1994-08-16
JPH0674881B2 (ja) 1994-09-21
ATE107015T1 (de) 1994-06-15
RU1773299C (ru) 1992-10-30
NO177105B (no) 1995-04-10

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