EP0191910A1 - Ceramic fire tube for a radiant heating cover tube of an industrial burner - Google Patents

Ceramic fire tube for a radiant heating cover tube of an industrial burner Download PDF

Info

Publication number
EP0191910A1
EP0191910A1 EP85114525A EP85114525A EP0191910A1 EP 0191910 A1 EP0191910 A1 EP 0191910A1 EP 85114525 A EP85114525 A EP 85114525A EP 85114525 A EP85114525 A EP 85114525A EP 0191910 A1 EP0191910 A1 EP 0191910A1
Authority
EP
European Patent Office
Prior art keywords
tube
flame tube
ceramic
flame
sleeve
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
EP85114525A
Other languages
German (de)
French (fr)
Other versions
EP0191910B1 (en
Inventor
Theo Wörner
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.)
Aichelin GmbH Germany
Original Assignee
Aichelin GmbH Germany
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 Aichelin GmbH Germany filed Critical Aichelin GmbH Germany
Priority to AT85114525T priority Critical patent/ATE49650T1/en
Publication of EP0191910A1 publication Critical patent/EP0191910A1/en
Application granted granted Critical
Publication of EP0191910B1 publication Critical patent/EP0191910B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube

Definitions

  • the invention relates to a ceramic flame tube for the jacket radiant tube of an industrial burner, which at least partially consists of individual ceramic tube pieces which are positively connected to one another on the end face and to which externally arranged rib-like or cam-like spacers for radial support against a jacket tube surrounding the flame tube are assigned.
  • Sheathed jet heating tubes with ceramic flame tubes are distinguished by the fact that they can absorb the high thermal loads that occur in particular when the burner is on / off, without affecting the service life.
  • they are subject to a high risk of breakage, which arises in particular in the case of built-in radiant tube heating pipes from the fact that the metal cast-iron tube surrounding the flame tube not only changes in length under the effect of temperature , but also experiences a certain deflection, which the one-piece, relatively rigid ceramic flame tube cannot follow.
  • the object of the invention is therefore to provide a resistant, flexible, ceramic flame tube which, with a simple structure, prevents local overheating points from occurring on the surrounding metallic jacket tube and is distinguished by ease of assembly and repair.
  • the ceramic flame tube mentioned at the outset is characterized according to the invention in that the thin-walled tube pieces are formed at one end in each case as a sleeve and inserted into one another with play, and in the area of the sleeve connection points on the flame tube in each case a ceramic tube Cover ring with play is placed on the outside, which extends in the axial direction over a part of the respective pipe section and by which the associated sleeve is at least partially covered.
  • the socket connection of the pipe sections allows a certain axial mutual mobility of the pipe sections at the connection points, without the pipe sections being separated from one another.
  • the annular gap present between the inner wall of a sleeve and the outer wall of the inserted pipe section opens on the outside of the flame tube in the axial direction of the flame tube. It is also covered on the outside by the cover ring which, with the outer circumferential surface of the sleeve or the tube piece inserted into the sleeve, in turn delimits annular gaps which open in the axial direction of the flame tube.
  • the gaps which are necessarily present at the connection points of the tube pieces which are inserted into one another with play are designed in the manner of labyrinths, which represent a high flow resistance for the hot flame gases in the interior of the flame tube. Any flame gases that pass through can only escape in the axial direction of the flame tube, i.e. they only coat the outer peripheral surface of parts of the ceramic pipe pieces, which is harmless. In any case, no flame gas flows radially emerging from the outside of the flame tube can occur from the connection points, which can strike the metallic jacket tube and could lead to local overheating there.
  • the pipe pieces and the cover rings are only put together in the flame tube, without any unsolvable cement connections would be required. This also allows parts that have become defective to be exchanged without the need to replace the entire flame tube.
  • each pipe section can carry an axially supporting ring shoulder at the end facing away from the sleeve for this purpose.
  • connection conditions of the flame tube to the burner result when the pipe piece adjacent to the burner is plugged with its socket-side end onto a ceramic burner mouthpiece, a connecting ring with play fitting against the burner mouthpiece being inserted into the sleeve of this pipe piece.
  • the connecting ring results in a tight connection of the flame tube to the ceramic burner mouthpiece, so that burning back of the flame between the burner mouthpiece and the flame tube is impossible. Because the burner mouthpiece and the flame tube are simply plugged together, the burner can be easily pulled out during disassembly if necessary, without the flame tube needing to be removed from the jacket tube.
  • the connecting ring expediently carries spacers on its outer peripheral surface, so that the connecting ring simultaneously centers the flame tube on the side adjacent to the burner mouthpiece together with the burner mouthpiece.
  • the cover rings have spacers on their outer circumferential surface, which effect the centering of the flame tube in the casing tube. In this way it is achieved that the tube pieces can be produced as simple, smooth-walled parts with little effort, while on the other hand the spacer parts on the cover rings ensure radial centering of the flame tube in the region of the connection points of the tube pieces, which is favorable for the stability of the flame tube.
  • such a spacer cover ring can be placed in an orientation rotated by 180 ° in order to center the flame tube at the end facing away from the burner, without the need for separate centering parts, etc.
  • the thin-walled pipe sections are made of a heavy-duty ceramic material and are characterized by their great resistance. They are preferably made of pure silicon carbide, which has proven itself extremely well for these purposes.
  • the drawing shows a radiant jacket tube with a ceramic flame tube according to the invention, in axial section, in a side view and in a partial view.
  • a ceramic flame tube 3 is arranged coaxially in a jacket tube 1 which is made of cast steel and is closed at two ends. Between the flame tube 3 and the casing tube 1, an annular space 4 is delimited, which serves to remove the combustion gases, as is known per se.
  • the casing tube 1 forms part of an industrial burner, which is not shown in further detail, of which only the funnel-like burner mouthpiece 5 which is coaxial with the casing tube 1 and projects into it is shown, which is also made of ceramic material and which carries an essentially cylindrical connecting piece 6 which the flame tube 3 is attached.
  • the flame tube 3 consists of the same individual ceramic, thin-walled tube pieces 7, which are each formed at one end at 8 as a sleeve and on the side opposite the sleeve 8 have a cylindrical region 9 of somewhat reduced outer diameter, which delimits an annular shoulder 10.
  • the pipe sections 7 are made of pure silicon carbide. Their wall thickness is typically approx. 5 mm, the reduction in the outer diameter, which is exaggerated in the drawing for the sake of clarity, at 9 being only approx.
  • the externally and internally smooth-walled pipe sections 7 are inserted with their sleeves 8 in the manner shown in the figure with radial play, the pipe section 7a adjacent to the burner being plugged onto the connection piece 6 of the burner mouthpiece 5 with its socket-side end.
  • each cover ring 11 has an area 12 which at least partially covers the associated sleeve 8 in the axial direction and which can also extend beyond the sleeve 8, as is indicated at 13.
  • the spacer rings 11 On their cylindrical outer circumferential surface, the spacer rings 11 have rib-like spacers 14 which are aligned axially parallel and are integrally formed on the cover rings 11 in a uniform manner around the circumference of the ring.
  • the spacer parts 14, which can alternatively also be designed in the form of cams or similar elevations, project radially up to the inner wall of the casing tube 1, on which they support and center the flame tube 3 radially.
  • the radial distribution and the formation of the spacer parts 14 are such that they oppose the exhaust gases flowing through the annular space 4 with as little flow resistance as possible, but nevertheless ensure perfect mechanically resistant centering of the flame tube 3.
  • a cover ring 11 carrying spacers 14 is rotated by 180 ° on the terminal pipe section 7 in the manner shown in the figure. It ensures that the flame tube 3 is properly held and centered radially at its free end without the need for separate parts. At the same time, it results in an enlargement of the flame tube end face at the outlet end of the flame tube 3.
  • the ceramic connecting ring 15 which on its cylindrical outer circumferential surface also has regularly spaced rib-like spacers 16 which hold the flame tube 3 and the burner mouthpiece 5 Support and center radially on the inner casing wall 1.
  • annular gaps are present which open into the annular space 4 essentially coaxially to the flame tube 3.
  • Such ring gaps are present at 17, 18, for example.
  • cover rings 11 Through the cover rings 11, a labyrinth-like resulting design of the annular gaps is achieved on the connecting pieces of adjacent pipe pieces 7, which rules out a radial escape of hot flame gases into the annular space 4.
  • the pipe sections 7 can be pulled apart relatively widely at their connection points, without the tight connection between the pipe sections or the stability of the flame pipe 3 being impaired thereby. Because of the existing play in the sleeves 8 and in the area of the cover rings 11, the flame tube 3 can also follow relatively large deflections of the casing tube 1 without causing undue stresses in the pipe sections or in the cover rings 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Chimneys And Flues (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Tunnel Furnaces (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

1. An outer radiant heating tube for an industrial burner having a ceramic flame tube (3) consisting at least partially of individual ceramic tube portions (7, 7a) which are interconnected positively at their ends and with which externally disposed rib-like or cam-like spacing members (14, 16) are associated for radial bearing against an outer tube (1) enclosing the flame tube, each of the tube portions being formed at one end as a socket (8) and having at the other end a cylindrical zone (9) fitting into such socket, characterized in that adjoining tube portions (7, 7a) are inserted into one another with clearance at the socket connecting places, and fitted with clearance on to the outside of the flame tube (3) in the zone of each of the socket connecting places is a ceramic covering ring (11) which is positively fixed to the flame tube (3) in the axial direction, extends in the axial direction over a portion of the cylindrical zone (9) of each tube portion (7, 7a) and is at least partially covered by the associated socket (8).

Description

Die Erfindung betrifft ein keramisches Flammrohr für das Mantelstrahlheizrohr eines Industriebrenners, das wenigstens teilweise aus einzelnen keramischen Rohrstücken besteht, die stirnseitig formschlüssig miteinander verbunden sind und denen außen angeordnete rippen- oder nockenartige Abstandsteile zur radialen Abstützung gegen ein das Flammrohr umgebendes Mantelrohr zugeordnet sind.The invention relates to a ceramic flame tube for the jacket radiant tube of an industrial burner, which at least partially consists of individual ceramic tube pieces which are positively connected to one another on the end face and to which externally arranged rib-like or cam-like spacers for radial support against a jacket tube surrounding the flame tube are assigned.

Mantelstrahlheizrohre mit keramischen Flammrohren zeichnen sich dadurch aus, daß sie die insbesondere im Ein-/Aus-Betrieb des Brenners auftretenden hohen thermischen Belastungen ohne Beeinträchtigung der Lebensdauer aufnehmen können. In der Ausführung als über die gesamte Flammrohrlänge durchgehendes einstückiges Keramikrohr (GB-PS 716 579) unterliegen sie aber einer hohen Bruchgefahr, die insbesondere bei liegend eingebauten Mantelstrahlheizrohren daher rührt, daß das das Flammrohr mit Abstand umgebende metallische Gußmantelrohr unter der auftretenden Temperatureinwirkung nicht nur Längenänderungen, sondern auch eine gewisse Durchbiegung erfährt, der das einstückige, verhältnismäßig starre keramische Flammrohr nicht zu folgen vermag.Sheathed jet heating tubes with ceramic flame tubes are distinguished by the fact that they can absorb the high thermal loads that occur in particular when the burner is on / off, without affecting the service life. In the design as a one-piece ceramic tube over the entire length of the flame tube (GB-PS 716 579), however, they are subject to a high risk of breakage, which arises in particular in the case of built-in radiant tube heating pipes from the fact that the metal cast-iron tube surrounding the flame tube not only changes in length under the effect of temperature , but also experiences a certain deflection, which the one-piece, relatively rigid ceramic flame tube cannot follow.

Um dem keramischen Flammrohr eine gewisse Elastizität zu geben, ist es deshalb auch bekannt (GB-PS 564 523, US-PS 2478 732), das Flammrohr aus einzelnen kreiszylindrischen Rohrstücken oder Kreisringabschnitten zusammenzusetzen, die stirnseitig stumpf aneinanderstoßend koaxial zusammengefügt sind. Um eine gegenseitige Führung der Rohrstücke an den Verbindungsstellen zu gewährleisten, sind die Rohrstücke stirnseitig nach Art von Nut und Feder ausgebildet. Dabei ergibt sich aber grundsätzlich an den Verbindungsstellen jeweils ein in einer zu der Flammrohrachse rechtwinklig verlaufenden Ebene liegender Ringspalt, der radial zur Außenumfangsfläche hin mündet. Wird ein solcher Ringspalt zwischen zwei aneinanderstoßenden Rohrstücken, hervorgerufen durch unterschiedliche Längenänderungen des metallischen Mantelrohres und des keramischen Flammrohres, oder durch eine Durchbiegung des Mantelrohres, teilweise geöffnet, so können heiße Flammengase vom Inneren des Flammrohres nach außen treten, wo sie radial gerichtet auf das metallische Mantelrohr auftreffen. Das auf seiner Innenseite von den durch den Ringraum zwischen dem Flammrohr und dem Mantelrohr strömenden (kühleren) Abgasen bestrichene Mantelrohr wird durch solche lokalen Überhitzungen thermisch überbeansprucht und dadurch entweder rasch zerstört oder zumindest in seiner Lebensdauer beeinträchtigt. Weil die verhältnismäßig dickwandig ausgebildeten bekannten keramischen Rohrstücke oder Kreisringteile sich unter der Einwirkung der unterschiedlich hohen Temperaturen auf ihrer Innen- und ihrer Außenseite als rißanfällig erwiesen, ist es auch bekannt, die Kreisringteile aus einzelnen sektorförmig ausgebildeten Teilstücken zusammenzusetzen, die an den Stoßstellen formschlüssige Verbindungseinrichtungen aufweisen (DE-PS 1551 762). Damit konnte zwar ein sehr flexibles keramisches Flammrohr hergestellt werden, das aus verhältnismäßiq kleinen und damit auch gegen große Temperaturgradienten unempfindlichen Teilen zusammengesetzt ist, doch müssen die einzelnen Teilstücke mit einem keramischen Kitt miteinander verbunden werden, um dem ganzen Flammrohr die notwendige Stabilität zu geben. Dies ist ein zusätzlicher Aufwand. Außerdem muß bei Beschädigung eines keramischen Teilstückes das ganze Flammrohr ausgetauscht werden, weil ein Ersatz des eingekitteten schadhaften Teilstückes nicht möglich ist.In order to give the ceramic flame tube a certain elasticity, it is therefore also known (GB-PS 564 523, US-PS 2478 732) to assemble the flame tube from individual circular-cylindrical tubular pieces or annular sections which are butt-jointed butt-coaxial. In order to ensure mutual guidance of the pipe sections at the connection points, the pipe sections are designed on the face side in the manner of tongue and groove. In principle, however, there is an annular gap at the connection points in each case lying in a plane running at right angles to the flame tube axis, which opens radially towards the outer peripheral surface. If such an annular gap between two abutting pipe pieces, caused by different changes in length of the metallic jacket tube and the ceramic flame tube, or by a deflection of the jacket tube, is partially opened, then hot flame gases can escape from the inside of the flame tube, where they are directed radially towards the metallic one Impact the casing tube. The inside of the jacket pipe, which is swept by the (cooler) exhaust gases flowing through the annular space between the flame tube and the jacket tube, is thermally overstressed by such local overheating and thereby either quickly destroyed or at least impaired in its service life. Because the relatively thick walls formed known ceramic tube pieces or annular parts proven under the action of the differently high temperatures on its inner and its outer side as susceptible to cracking, it is also known that K rice ring parts of individual sector-shaped sections to assemble, the form-fitting at the joints connecting means have (DE-PS 1551 762). Although it was possible to produce a very flexible ceramic flame tube, which is composed of relatively small and therefore insensitive to large temperature gradients, the individual sections must be connected with a ceramic cement to give the entire flame tube the necessary stability. This is an additional effort. In addition, if a ceramic section is damaged, the entire flame tube must be replaced, because it is not possible to replace the defective damaged section.

Aufgabe der Erfindung ist es deshalb, ein widerstandsfähiges, flexibles, keramisches Flammrohr zu schaffen, das bei einfachem Aufbau das Auftreten örtlicher Uberhitzungsstellen an dem umgebenden metallischen Mantelrohr verhütet und sich durch Montage- und Reparaturfreundlichkeit auszeichnet.The object of the invention is therefore to provide a resistant, flexible, ceramic flame tube which, with a simple structure, prevents local overheating points from occurring on the surrounding metallic jacket tube and is distinguished by ease of assembly and repair.

Zur Lösung dieser Aufgabe ist das eingangs genannte keramische Flammrohr erfindungsgemäß dadurch gekennzeichnet, daß die dünnwandigen Rohrstücke einenends jeweils als Muffe ausgebildet und mit Spiel ineinandergesteckt sind und daß im Bereiche der Muffenverbindungsstellen auf das Flammrohr jeweils ein keramischer Abdeckring mit Spiel außen aufgesetzt ist, der sich in Achsrichtung über einen Teil des jeweiligen Rohrstückes erstreckt und durch den die zugeordnete Muffe zumindest teilweise abgedeckt ist.To solve this problem, the ceramic flame tube mentioned at the outset is characterized according to the invention in that the thin-walled tube pieces are formed at one end in each case as a sleeve and inserted into one another with play, and in the area of the sleeve connection points on the flame tube in each case a ceramic tube Cover ring with play is placed on the outside, which extends in the axial direction over a part of the respective pipe section and by which the associated sleeve is at least partially covered.

Die Muffenverbindung der Rohrstücke erlaubt an den Verbindungsstellen eine gewisse axiale gegenseitige Beweglichkeit der Rohrstücke, ohne daß die Rohrstücke voneinander getrennt würden. Der zwischen der Innenwandung einer Muffe und der Außenwandung des eingesteckten Rohrstückes vorhandene Ringspalt mündet auf der Flammrohraußenseite in Achsrichtung des Flammrohrs. Er ist außerdem nach außen zu durch den Abdeckring abgedeckt, der mit der Außenumfangsfläche der Muffe bzw. des in die Muffe eingesteckten Rohrstückes wiederum in Achsrichtung des Flammrohres sich öffnende Ringspalte begrenzt. Damit sind die an den Verbindungsstellen der mit Spiel ineinandergesteckten Rohrstücke notwendigerweise vorhandenen Spalte nach Art von Labyrinthen ausgebildet, die einen hohen Strömungswiderstand für die heißen Flammengase im Inneren des Flammrohres darstellen. Etwa durchtretende Flammengase können aber nur in Achsrichtung des Flammrohres austreten, d.h. sie bestreichen nur die Außenumfangsfläche von Teilen der keramischen Rohrstücke, was unschädlich ist. Aus den Verbindungsstellen können jedenfalls keine von der Flammrohraußenseite radial abgehende Flammengasströme auftreten, die auf das metallische Mantelrohr auftreffen und dort zu örtlichen Überhitzungen führen könnten.The socket connection of the pipe sections allows a certain axial mutual mobility of the pipe sections at the connection points, without the pipe sections being separated from one another. The annular gap present between the inner wall of a sleeve and the outer wall of the inserted pipe section opens on the outside of the flame tube in the axial direction of the flame tube. It is also covered on the outside by the cover ring which, with the outer circumferential surface of the sleeve or the tube piece inserted into the sleeve, in turn delimits annular gaps which open in the axial direction of the flame tube. The gaps which are necessarily present at the connection points of the tube pieces which are inserted into one another with play are designed in the manner of labyrinths, which represent a high flow resistance for the hot flame gases in the interior of the flame tube. Any flame gases that pass through can only escape in the axial direction of the flame tube, i.e. they only coat the outer peripheral surface of parts of the ceramic pipe pieces, which is harmless. In any case, no flame gas flows radially emerging from the outside of the flame tube can occur from the connection points, which can strike the metallic jacket tube and could lead to local overheating there.

Die Rohrstücke und die Abdeckringe sind bei dem Flammrohr lediglich zusammengesteckt, ohne daß irgendwelche unlösbaren Kittverbindungen erforderlich wären. Damit können auch schadhaft gewordene Teile ohne weiteres ausgetauscht werden, ohne daß das ganze Flammrohr ersetzt werden müßte.The pipe pieces and the cover rings are only put together in the flame tube, without any unsolvable cement connections would be required. This also allows parts that have become defective to be exchanged without the need to replace the entire flame tube.

Zur Erhöhung der Abdichtwirkung im Bereiche der Verbindungsstellen der Rohrstücke kann es vorteilhaft sein, wenn der Abdeckring sich in Achsrichtung jeweils über die Muffe hinaus erstreckt. Außerdem ist bei einer bevorzugten Ausführungsform der Abdeckring an dem Flammrohr in Achsrichtung formschlüssig fixiert, wodurch einerseits die Montage erleichtert und andererseits ein unbeabsichtigtes Verschieben des Abdeckringes auf dem Flammrohr verhütet sind. In der konstruktiven Ausgestaltung kann zu diesem Zwecke jedes Rohrstück an dem der Muffe abgewandten Ende eine den Abdeckring axial abstützende Ringschulter tragen.To increase the sealing effect in the area of the connection points of the pipe pieces, it can be advantageous if the cover ring extends in the axial direction in each case beyond the sleeve. In addition, in a preferred embodiment, the cover ring is positively fixed to the flame tube in the axial direction, which on the one hand facilitates assembly and on the other hand prevents the cover ring from being inadvertently shifted on the flame tube. In the constructive embodiment, each pipe section can carry an axially supporting ring shoulder at the end facing away from the sleeve for this purpose.

Günstige Anschlußverhältnisse des Flammrohres an den Brenner ergeben sich, wenn das dem Brenner benachbarte Rohrstück mit seinem muffenseitigen Ende auf ein keramisches Brennermundstück aufgesteckt ist, wobei in die Muffe dieses Rohrstückes ein an dem Brennermundstück anliegender Anschlußring mit Spiel eingesetzt ist. Der Anschlußring ergibt einen dichten Anschluß des Flammrohres an das keramische Brennermundstück, so daß ein Zurückbrennen der Flamme zwischen Brennermundstück und Flammrohr ausgeschlossen ist. Da das Brennermundstück und das Flammrohr lediglich zusammengesteckt sind, kann der Brenner erforderlichenfalls bei der Demontage einfach herausgezogen werden, ohne daß das Flammrohr aus dem Mantelrohr herausgenommen zu werden braucht. Der Anschlußring trägt auf seiner Außenumfangsfläche zweckmäßigerweise Abstandsteile, so daß der Anschlußring gleichzeitig das Flammrohr auf der dem Brennermundstück benachbarten Seite gemeinsam mit dem Brennermundstück zentriert. In ähnlicher Weise ist es vorteilhaft, wenn die Abdeckringe auf ihrer Außenumfangsfläche Abstandsteile tragen, die die Zentrierung des Flammrohres in dem Mantelrohr bewirken. Auf diese Weise wird erreicht, daß die Rohrstücke als einfache, glattwandige Teile mit geringem Aufwand hergestellt werden können, während andererseits die Abstandsteile auf den Abdeckringen eine radiale Zentrierung des Flammrohres im Bereiche der Verbindungsstellen der Rohrstücke gewährleisten, was für die Stabilität des Flammrohres günstig ist.Favorable connection conditions of the flame tube to the burner result when the pipe piece adjacent to the burner is plugged with its socket-side end onto a ceramic burner mouthpiece, a connecting ring with play fitting against the burner mouthpiece being inserted into the sleeve of this pipe piece. The connecting ring results in a tight connection of the flame tube to the ceramic burner mouthpiece, so that burning back of the flame between the burner mouthpiece and the flame tube is impossible. Because the burner mouthpiece and the flame tube are simply plugged together, the burner can be easily pulled out during disassembly if necessary, without the flame tube needing to be removed from the jacket tube. The connecting ring expediently carries spacers on its outer peripheral surface, so that the connecting ring simultaneously centers the flame tube on the side adjacent to the burner mouthpiece together with the burner mouthpiece. In a similar manner, it is advantageous if the cover rings have spacers on their outer circumferential surface, which effect the centering of the flame tube in the casing tube. In this way it is achieved that the tube pieces can be produced as simple, smooth-walled parts with little effort, while on the other hand the spacer parts on the cover rings ensure radial centering of the flame tube in the region of the connection points of the tube pieces, which is favorable for the stability of the flame tube.

Auf das endständige Rohrstück des Flammrohres kann ein solcher Abstandsteile tragender Abdeckring in um 180° verdrehter Ausrichtung aufgesetzt sein, um das Flammrohr auch an dem dem Brenner abgewandten Ende zu zentrieren, ohne daß dazu eigene Zentrierteile etc. erforderlich wären.On the end of the tube of the flame tube such a spacer cover ring can be placed in an orientation rotated by 180 ° in order to center the flame tube at the end facing away from the burner, without the need for separate centering parts, etc.

Die dünnwandigen Rohrstücke, deren Wandstärke typischerweise in der Größenordnung von ca. 5 mm liegt, sind aus einem hochbelastbaren keramischen Material hergestellt und zeichnen sich durch große Widerstandsfähigkeit aus. Sie bestehen vorzugsweise aus reinem Silicium-Karbid, das sich für diese Zwecke hervorragend bewährt hat. In der Zeichnung ist ein Ausführungsbeispiel des Gegenstandes der Erfindung dargestellt. Die Zeichnung zeigt ein Mantelstrahlheizrohr mit einem keramischen Flammrohr gemäß der Erfindung, im axialen Schnitt, in einer Seitenansicht und in einer Teildarstellung.The thin-walled pipe sections, the wall thickness of which is typically on the order of approx. 5 mm, are made of a heavy-duty ceramic material and are characterized by their great resistance. They are preferably made of pure silicon carbide, which has proven itself extremely well for these purposes. In the drawing, an embodiment of the object of the invention is shown. The drawing shows a radiant jacket tube with a ceramic flame tube according to the invention, in axial section, in a side view and in a partial view.

In einem aus Gußstahl bestehenden, endseitig bei 2 verschlossenen Mantelrohr 1 ist ein keramisches Flammrohr 3 koaxial angeordnet. Zwischen dem Flammrohr 3 und dem Mantelrohr 1 ist ein Ringraum 4 begrenzt, der zur Abführung der Verbrennungsgase dient, wie dies an sich bekannt ist. Das Mantelrohr 1 bildet ein Teil eines in seinen Einzelheiten nicht weiter veranschaulichten Industriebrenners,von dem lediglich das zu dem Mantelrohr 1 koaxiale und in dieses hineinragende trichterartige Brennermundstück 5 dargestellt ist, das ebenfalls aus Keramikmaterial besteht und das einen im wesentlichen zylindrischen Anschlußstutzen 6 trägt, auf den das Flammrohr 3 aufgesteckt ist.A ceramic flame tube 3 is arranged coaxially in a jacket tube 1 which is made of cast steel and is closed at two ends. Between the flame tube 3 and the casing tube 1, an annular space 4 is delimited, which serves to remove the combustion gases, as is known per se. The casing tube 1 forms part of an industrial burner, which is not shown in further detail, of which only the funnel-like burner mouthpiece 5 which is coaxial with the casing tube 1 and projects into it is shown, which is also made of ceramic material and which carries an essentially cylindrical connecting piece 6 which the flame tube 3 is attached.

Das Flammrohr 3 besteht aus gleichen einzelnen keramischen, dünnwandigen Rohrstücken 7, die einenends bei 8 jeweils als Muffe ausgebildet sind und auf der der Muffe 8 gegenüberliegenden Seite einen zylindrischen Bereich 9 etwas verringerten Außendurchmessers aufweisen, der eine Ringschulter 10 begrenzt. Die Rohrstücke 7 sind aus reinem Silicium-Karbid hergestellt. Ihre Wandstärke beträgt typischerweise ca. 5 mm, wobei die in der Zeichnung der Deutlichkeit halber übertrieben groß dargestellte Außendurchmesserverringerung bei 9 lediglich ca. 0,5 - 1 mm beträgt.The flame tube 3 consists of the same individual ceramic, thin-walled tube pieces 7, which are each formed at one end at 8 as a sleeve and on the side opposite the sleeve 8 have a cylindrical region 9 of somewhat reduced outer diameter, which delimits an annular shoulder 10. The pipe sections 7 are made of pure silicon carbide. Their wall thickness is typically approx. 5 mm, the reduction in the outer diameter, which is exaggerated in the drawing for the sake of clarity, at 9 being only approx.

Die außen und innen glattwandigen Rohrstücke 7 sind mit ihren Muffen 8 in der aus der Figur ersichtlichen Weise mit radialem Spiel ineinandergesteckt, wobei das dem Brenner benachbarte Rohrstück 7a mit seinem muffenseitigen Ende auf den Anschlußstutzen 6 des Brennermundstückes 5 aufgesteckt ist.The externally and internally smooth-walled pipe sections 7 are inserted with their sleeves 8 in the manner shown in the figure with radial play, the pipe section 7a adjacent to the burner being plugged onto the connection piece 6 of the burner mouthpiece 5 with its socket-side end.

Im Bereiche der Muffenverbindungsstellen zwischen den Rohrstücken 7 ist auf das Flammrohr 3 jeweils ein keramischer Abdeckring 11 mit Spiel außen aufgesetzt, der sich über den aus der zugehörigen Muffe des benachbarten Rohrstückes 7 herausragenden Bereich 9 verringerten Außendurchmesser in Achsrichtung erstreckt und zwischen der zugeordneten Ringschulter 10 des einen Rohrstückes 7 und der Stirnfläche der Muffe 8 des anschließenden Rohrstückes 7 axial unverschieblich gehaltert ist. Jeder Abdeckring 11 weist einen die zugeordnete Muffe 8 in Achsrichtung zumindest teilweise überdeckenden Bereich 12 auf, der sich auch über die Muffe 8 hinaus erstrecken kann, wie dies bei 13 angedeutet ist.In the area of the socket connection points between the pipe sections 7, a ceramic cover ring 11 with play on the outside is placed on the flame pipe 3, which extends over the region 9 of reduced external diameter protruding from the associated socket of the adjacent pipe section 7 and in the axial direction and between the associated annular shoulder 10 of the a pipe section 7 and the end face of the sleeve 8 of the subsequent pipe section 7 is axially fixed. Each cover ring 11 has an area 12 which at least partially covers the associated sleeve 8 in the axial direction and which can also extend beyond the sleeve 8, as is indicated at 13.

Auf ihrer zylindrischen Außenumfangsfläche tragen die Abstandsringe 11 achsparallel ausgerichtete rippenartige Abstandsteile 14, die um den Ringumfang gleichmäßig verteilt an den Abdeckringen 11 einstückig angeformt sind. Die Abstandsteile 14, die alternativ auch in Gestalt von Nocken oder dergl. Erhebungen ausgebildet sein können, ragen radial bis zur Innenwand des Mantelrohres 1, an dem sie das Flammrohr 3 radial abstützen und zentrieren. Die radiale Verteilung und die Ausbildung der Abstandsteile 14 sind derart getroffen, daß sie den durch den Ringraum 4 abströmenden Abgasen einen möglichst geringen Strömungswiderstand entgegensetzen, dennoch aber eine einwandfreie mechanisch widerstandsfähige Zentrierung des Flammrohres 3 gewährleisten.On their cylindrical outer circumferential surface, the spacer rings 11 have rib-like spacers 14 which are aligned axially parallel and are integrally formed on the cover rings 11 in a uniform manner around the circumference of the ring. The spacer parts 14, which can alternatively also be designed in the form of cams or similar elevations, project radially up to the inner wall of the casing tube 1, on which they support and center the flame tube 3 radially. The radial distribution and the formation of the spacer parts 14 are such that they oppose the exhaust gases flowing through the annular space 4 with as little flow resistance as possible, but nevertheless ensure perfect mechanically resistant centering of the flame tube 3.

Auf das endständige Rohrstück 7 ist ein Abstandsteile 14 tragenden Abdeckring 11 um 180° gedreht in der aus der Figur ersichtlichen Weise aufgeschoben. Er gewährleistet, daß das Flammrohr 3 an seinem freien Ende einwandfrei radial gehalten und zentriert ist, ohne daß dazu eigene Teile erforderlich wären. Gleichzeitig ergibt er am Austrittsende des Flammrohres 3 eine Vergrößerung der Flammrohrstirnfläche.A cover ring 11 carrying spacers 14 is rotated by 180 ° on the terminal pipe section 7 in the manner shown in the figure. It ensures that the flame tube 3 is properly held and centered radially at its free end without the need for separate parts. At the same time, it results in an enlargement of the flame tube end face at the outlet end of the flame tube 3.

An dem anderen Ende des Flammrohres 3 ist in die Muffe 8 ein an dem Anschlußstutzen 6 des Brennermundstückes 5 außen anliegender keramischer Anschlußring 15 eingesteckt, der auf seiner zylindrischen Außenumfangsfläche ebenfalls ringsum regelmäßig in Abständen verteilte rippenartige Abstandsteile 16 trägt, die das Flammrohr 3 und das Brennermundstück 5 radial an der Mantelrohrinnenwand 1 abstützen und zentrieren.At the other end of the flame tube 3 is inserted into the socket 8 on the connecting piece 6 of the burner mouthpiece 5 on the outside, the ceramic connecting ring 15, which on its cylindrical outer circumferential surface also has regularly spaced rib-like spacers 16 which hold the flame tube 3 and the burner mouthpiece 5 Support and center radially on the inner casing wall 1.

Die Zeichnung zeigt, daß an den Verbindungsstellen der Rohrstücke 7,ebenso wie an der Anschlußstelle des dem Brenner benachbarten Rohrstückes 7a an dem Brennermundstück 5 lediglich Ringspalte vorhanden sind, die in den Ringraum 4 im wesentlichen koaxial zu dem Flammrohr 3 gerichtet münden. Solche Ringspalte sind bspw. bei 17, 18 vorhanden. Durch die Abdeckringe 11 wird an den Verbindungsstücken benachbarter Rohrstücke 7 eine labyrinthartige resultierende Gestaltung der Ringspalte erreicht, die einen radialen Austritt von heißen Flammengasen in den Ringraum 4 ausschließt.The drawing shows that at the connection points of the pipe sections 7, as well as at the connection point of the pipe section 7a adjacent to the burner on the burner mouthpiece 5, only annular gaps are present which open into the annular space 4 essentially coaxially to the flame tube 3. Such ring gaps are present at 17, 18, for example. Through the cover rings 11, a labyrinth-like resulting design of the annular gaps is achieved on the connecting pieces of adjacent pipe pieces 7, which rules out a radial escape of hot flame gases into the annular space 4.

Die Rohrstücke 7 können bei einer Durchbiegung oder Längenänderung des Mantelrohres 1 in Achsrichtung an ihren Verbindungsstellen verhältnismäßig weit auseinandergezogen werden, ohne daß dadurch die dichte Verbindung zwischen den Rohrstücken oder die Stabilität des Flammrohres 3 beeinträchtigt würden. Wegen des vorhandenen Spieles in den Muffen 8 und im Bereiche der Abdeckringe 11 kann das Flammrohr 3 auch verhältnismäßig großen Durchbiegungen des Mantelrohres 1 folgen, ohne daß dadurch unzulässige Spannungen in den Rohrstücken oder in den Abdeckringen 11 hervorgerufen würden.In the event of a deflection or change in length of the tubular casing 1 in the axial direction, the pipe sections 7 can be pulled apart relatively widely at their connection points, without the tight connection between the pipe sections or the stability of the flame pipe 3 being impaired thereby. Because of the existing play in the sleeves 8 and in the area of the cover rings 11, the flame tube 3 can also follow relatively large deflections of the casing tube 1 without causing undue stresses in the pipe sections or in the cover rings 11.

Ein Verkleben oder Verkitten der einzelnen Teile des Flammrohres 3 ist unnötig, es sei denn, daß besondere Anwendungsfälle eine solche gegenseitige Fixierung der Teile erforderlich machen würden.Gluing or cementing the individual parts of the flame tube 3 is unnecessary, unless special applications would require such mutual fixation of the parts.

Claims (9)

1. Keramisches Flammrohr für das Mantelstrahlheizrohr eines Industriebrenners, das wenigstens teilweise aus einzelnen keramischen Rohrstücken besteht, die stirnseitig formschlüssig miteinander verbunden sind und denen außen angeordnete rippen- oder nockenartige Abstandsteile zur radialen Abstützung gegen ein das Flammrohr umgebendes Mantelrohr zugeordnet sind, dadurch gekennzeichnet, daß die dünnwandigen Rohrstücke (7, 7a) einenends jeweils als Muffe (8) ausgebildet und mit Spiel ineinandergesteckt sind und daß im Bereiche der Muffenverbindungsstellen auf das Flammrohr (3) jeweils ein keramischer Abdeckring (11) mit Spiel außen aufgesetzt ist, der sich in Achsrichtung über einen Teil (9) des jeweiligen Rohrstückes (7, 7a) erstreckt und durch den die zugeordnete Muffe (8) zumindest teilweise abgedeckt ist.1. Ceramic flame tube for the jacket radiant tube of an industrial burner, which at least partially consists of individual ceramic tube pieces, which are positively connected to one another at the end face and which rib-like or cam-like spacers arranged on the outside are assigned for radial support against a jacket tube surrounding the flame tube, characterized in that the thin-walled pipe sections (7, 7a) are each formed at one end as a sleeve (8) and inserted into one another with play and that in the area of the sleeve connection points on the flame tube (3) a ceramic cover ring (11) with play is placed on the outside, which extends in the axial direction extends over a part (9) of the respective pipe section (7, 7a) and by which the associated sleeve (8) is at least partially covered. 2. Flammrohr nach Anspruch 1, dadurch gekennzeichnet, daß der Abdeckring (11) sich in Achsrichtung über die Muffe (8) hinaus erstreckt.2. Flame tube according to claim 1, characterized in that the cover ring (11) extends in the axial direction over the sleeve (8). 3. Flammrohr nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Abdeckring (11) an dem Flammrohr (3) in Achsrichtung formschlüssig fixiert ist.3. Flame tube according to claim 1 or 2, characterized in that the cover ring (11) on the flame tube (3) is positively fixed in the axial direction. 4. Flammrohr nach Anspruch 3, dadurch gekennzeichnet, daß jedes Rohrstück (7, 7a) an dem der Muffe (8) abgewandten Ende eine den Abdeckring (11) axial abstützende Ringschulter (10) trägt.4. Flame tube according to claim 3, characterized in that each tube piece (7, 7a) at the end facing away from the sleeve (8) carries a cover ring (11) axially supporting ring shoulder (10). 5. Flammrohr nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das dem Brenner benachbarte Rohrstück (7a) mit seinem muffenseitigen Ende auf ein keramisches Brennermundstück (5) aufgesteckt ist und daß in die Muffe (8) dieses Rohrstückes (7a) ein an dem Brennermundstück (5) anliegender Anschlußring (15) mit Spiel eingesetzt ist.5. Flame tube according to one of the preceding claims, characterized in that the pipe section (7a) adjacent to the burner is plugged with its socket-side end onto a ceramic burner mouthpiece (5) and that in the sleeve (8) of this pipe section (7a) one at the Burner mouthpiece (5) adjacent connecting ring (15) is inserted with play. 6. Flammrohr nach Anspruch 5, dadurch gekennzeichnet, daß der Anschlußring (15) auf seiner Außenumfangsfläche Abstandsteile (16) trägt.6. Flame tube according to claim 5, characterized in that the connecting ring (15) carries spacers (16) on its outer peripheral surface. 7. Flammrohr nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Abdeckringe (11) auf ihrer Außenumfangsfläche Abstandsteile (14) tragen.7. Flame tube according to one of the preceding claims, characterized in that the cover rings (11) carry spacers (14) on their outer peripheral surface. 8. Flammrohr nach Anspruch 7, dadurch gekennzeichnet, daß auf das endständige Rohrstück (7) ein Abstandsteile (14) tragender Abdeckring (11) in um 180° verdrehter Ausrichtung aufgesteckt ist.8. Flame tube according to claim 7, characterized in that on the terminal tube piece (7) a spacer (14) carrying cover ring (11) is inserted in an orientation rotated by 180 °. 9. Flammrohr nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Rohrstücke (7,7a) aus reinem Silicium-Karbid bestehen.9. Flame tube according to one of the preceding claims, characterized in that the tube pieces (7, 7a) consist of pure silicon carbide.
EP85114525A 1984-12-28 1985-11-15 Ceramic fire tube for a radiant heating cover tube of an industrial burner Expired - Lifetime EP0191910B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85114525T ATE49650T1 (en) 1984-12-28 1985-11-15 CERAMIC FLAME TUBE FOR THE JET TUBE OF AN INDUSTRIAL BURNER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3447603 1984-12-28
DE3447603A DE3447603C2 (en) 1984-12-28 1984-12-28 Ceramic flame tube for the jacketed radiant heating tube of an industrial burner

Publications (2)

Publication Number Publication Date
EP0191910A1 true EP0191910A1 (en) 1986-08-27
EP0191910B1 EP0191910B1 (en) 1990-01-17

Family

ID=6254010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85114525A Expired - Lifetime EP0191910B1 (en) 1984-12-28 1985-11-15 Ceramic fire tube for a radiant heating cover tube of an industrial burner

Country Status (11)

Country Link
EP (1) EP0191910B1 (en)
JP (1) JPS61173018A (en)
AT (1) ATE49650T1 (en)
CZ (1) CZ278206B6 (en)
DE (2) DE3447603C2 (en)
DK (1) DK160644C (en)
HU (1) HUT41886A (en)
NO (1) NO855058L (en)
PL (1) PL154687B1 (en)
SU (1) SU1438627A3 (en)
YU (1) YU44697B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2616518A1 (en) * 1987-06-11 1988-12-16 Gaz De France CERAMIC INTERNAL TUBE, IN PARTICULAR FOR RADIANT TUBE FINGER RECIRCULATION GLOVE
FR2616520A1 (en) * 1987-06-11 1988-12-16 Gaz De France BURNER SYSTEM IN PARTICULAR AT HIGH SPEED EXIT OF BURNED GASES
EP0321611A1 (en) * 1987-12-22 1989-06-28 Franco Andreoli Furnace tube for a radiation heating tube of an industrial oven
WO2010125550A3 (en) * 2009-04-27 2011-02-24 Kingspan Holdings (Irl) Limited Solar collector

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3915957A1 (en) * 1989-05-18 1990-11-22 Lbe Beheizungseinrichtungen COVERED HEATING PIPE
DE4132235C1 (en) * 1991-09-27 1992-08-13 Ws Waermeprozesstechnik Gmbh, 7253 Renningen, De
WO2000008385A1 (en) * 1998-08-03 2000-02-17 Igor Nikolaevich Nikolaev Method for burning fuel and device for realising the same
US20070107642A1 (en) 2005-11-14 2007-05-17 Johnson J E Fuel ignition systems
BRPI0814093A2 (en) * 2007-07-20 2015-02-03 Shell Int Research COMBUSTION HEATER WITHOUT FLAME
DE102007040788B4 (en) 2007-08-28 2009-06-25 Ibs Industrie-Brenner-Systeme Gmbh tube element
RU171677U1 (en) * 2016-12-23 2017-06-09 Елизавета Евгеньевна Беркович CERAMIC FITTING FOR CHIMNEY FROM CERAMIC PIPES

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB716579A (en) * 1952-03-27 1954-10-06 Internat Furnace Equipment Com Radiant-heating elements for furnaces
US3309072A (en) * 1962-06-04 1967-03-14 Shenango Ceramics Inc Recuperator tubes
CH496919A (en) * 1967-12-12 1970-09-30 Fetok Gmbh Radiation pipe device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2105533A (en) * 1934-01-19 1938-01-18 Selas Company Gas burning apparatus
GB564523A (en) * 1943-03-12 1944-10-02 John Fallon Improvements in gas-fired tubular heaters
US2478732A (en) * 1948-04-01 1949-08-09 Wilson Combustion tube heating apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB716579A (en) * 1952-03-27 1954-10-06 Internat Furnace Equipment Com Radiant-heating elements for furnaces
US3309072A (en) * 1962-06-04 1967-03-14 Shenango Ceramics Inc Recuperator tubes
CH496919A (en) * 1967-12-12 1970-09-30 Fetok Gmbh Radiation pipe device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2616518A1 (en) * 1987-06-11 1988-12-16 Gaz De France CERAMIC INTERNAL TUBE, IN PARTICULAR FOR RADIANT TUBE FINGER RECIRCULATION GLOVE
FR2616520A1 (en) * 1987-06-11 1988-12-16 Gaz De France BURNER SYSTEM IN PARTICULAR AT HIGH SPEED EXIT OF BURNED GASES
EP0296031A1 (en) * 1987-06-11 1988-12-21 Gaz De France Ceramic internal tube especially for radiant tube with internal exhaust gas recirculation
EP0296032A1 (en) * 1987-06-11 1988-12-21 Gaz De France Burning system with high exhaust gas exit speed
US4850334A (en) * 1987-06-11 1989-07-25 Gas De France Inner ceramic tube in particular for a glove finger-shaped radiant tube for recirculation
EP0321611A1 (en) * 1987-12-22 1989-06-28 Franco Andreoli Furnace tube for a radiation heating tube of an industrial oven
WO2010125550A3 (en) * 2009-04-27 2011-02-24 Kingspan Holdings (Irl) Limited Solar collector

Also Published As

Publication number Publication date
YU44697B (en) 1990-12-31
CS8509903A2 (en) 1991-10-15
NO855058L (en) 1986-06-30
DE3575464D1 (en) 1990-02-22
JPH022043B2 (en) 1990-01-16
DK160644B (en) 1991-04-02
PL256900A1 (en) 1986-11-18
ATE49650T1 (en) 1990-02-15
HUT41886A (en) 1987-05-28
DE3447603A1 (en) 1986-07-03
PL154687B1 (en) 1991-09-30
DK160644C (en) 1991-09-02
SU1438627A3 (en) 1988-11-15
DK562485A (en) 1986-06-29
DK562485D0 (en) 1985-12-04
YU205085A (en) 1989-02-28
JPS61173018A (en) 1986-08-04
DE3447603C2 (en) 1987-02-05
CZ278206B6 (en) 1993-10-13
EP0191910B1 (en) 1990-01-17

Similar Documents

Publication Publication Date Title
EP0164576B1 (en) Industrial burner for gaseous or liquid fuels
EP0191910B1 (en) Ceramic fire tube for a radiant heating cover tube of an industrial burner
DE3842470C2 (en) Combustion chamber for a gas turbine engine
DE970426C (en) Cyclone combustion chamber for gas turbines
DE3519938C2 (en)
EP0544853A1 (en) Air heater.
EP0171624B1 (en) Exhaust pipe for motor vehicle engines
EP0534104B1 (en) Radiant tube with jacket
EP0398252B1 (en) Radiant tube with jacket
DE3535442C2 (en)
DE1168929B (en) Tubular heat exchanger element
EP1423647B1 (en) Combustion chamber arrangement
DE4141801C1 (en)
DE2314118C2 (en) Flame tube for a jacket radiant heating tube of an industrial furnace
DE10140422C1 (en) Thermal post-combustion device for cleaning waste gases comprises a burner having a second flame tube surrounding the end of a first flame tube with a greater radius to form an annular gap
DE2164563A1 (en) Arrangement of the gas supply branch and the discharge for treated material for a rotary kiln
DE102004008358B4 (en) vehicle heater
DE2160300B2 (en) Spacers between the jackets of a double-walled pipe or container exposed to temperature differences
DE849328C (en) Axial turbo expansion valve for gas turbines
DE4216649C2 (en) Sealing cord
DE2309696C3 (en) Heating boiler with deflection chamber
DE3623597C1 (en) Reactor
DE2218109B1 (en) GAS CAP
DE10158299A1 (en) Water tube boiler
AT314145B (en) Connection on the water side of a boiler made up of sections

Legal Events

Date Code Title Description
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): AT CH DE FR GB IT LI SE

RBV Designated contracting states (corrected)

Designated state(s): AT DE FR GB IT SE

17P Request for examination filed

Effective date: 19860802

17Q First examination report despatched

Effective date: 19880824

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB IT SE

REF Corresponds to:

Ref document number: 49650

Country of ref document: AT

Date of ref document: 19900215

Kind code of ref document: T

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3575464

Country of ref document: DE

Date of ref document: 19900222

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920925

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19920930

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19921005

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19921117

Year of fee payment: 8

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19931115

Ref country code: AT

Effective date: 19931115

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19931116

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19931115

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19940729

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 85114525.0

Effective date: 19940610

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19970114

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980801