EP0431314B1 - Heating boiler burning liquid or gaseous fuels - Google Patents

Heating boiler burning liquid or gaseous fuels Download PDF

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Publication number
EP0431314B1
EP0431314B1 EP90120992A EP90120992A EP0431314B1 EP 0431314 B1 EP0431314 B1 EP 0431314B1 EP 90120992 A EP90120992 A EP 90120992A EP 90120992 A EP90120992 A EP 90120992A EP 0431314 B1 EP0431314 B1 EP 0431314B1
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EP
European Patent Office
Prior art keywords
exhaust gas
burner
heating boiler
firing chamber
closure
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EP90120992A
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German (de)
French (fr)
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EP0431314A2 (en
EP0431314A3 (en
Inventor
Robert Hofmann
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Viessmann Werke GmbH and Co KG
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Viessmann Werke GmbH and Co KG
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Priority to AT90120992T priority Critical patent/ATE86369T1/en
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Publication of EP0431314A3 publication Critical patent/EP0431314A3/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/28Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
    • F24H1/285Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes with the fire tubes arranged alongside the combustion chamber
    • 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 
    • F23C9/00Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber

Definitions

  • the invention relates to a boiler for burning liquid or gaseous fuels according to the preamble of the main claim.
  • a boiler is known from EP-A-0 296 276.
  • Boilers of the type mentioned are generally known and in use and therefore do not require any special printed evidence.
  • NOx content in the exhaust gases which pollutes the environment in addition to other harmful gas components
  • branch off some of the exhaust gases to feed them back to the burner and to add them to the combustion air. See the article “Flue gas recirculation system” from Elring GmbH and DEPA GmbH in DE-Z “Chemical plants + processes” 1986, November, and the special print from DE-Z "gas warm international", volume 32, volume 1, 1983, pages 40-46.
  • the exhaust gas recirculation has so far also taken place in such a way that an external, well-heat-insulated line is provided outside the boiler, which connects the gas extraction area of the boiler to the suction side of the burner housing.
  • the following documents also describe similar exhaust gas recirculation systems: DE-U-87 08 656, DE-U-87 16 240 and DE-U-88 12 090.
  • the object of the invention is to be able to provide exhaust gas recirculation with the simplest possible means and using the structural conditions of such boilers with the least possible design changes.
  • the invention takes advantage of the fact that, for the purpose of optimizing the heat transfer from the flue gases to the boiler water, the flue gas pipes of such boilers are generally provided with so-called displacement bodies in order to ensure that the flue gases sweep along the walls of the flue pipe, as a rule such Exhaust pipes in the space between the displacement bodies and the pipe wall are provided with longitudinal ribs. Since these are pure displacement bodies, they do not take part in the heat transfer.
  • a displacer is now used for the exhaust gas recirculation, in that it is designed as a tube that is open at both ends, the rear end of which opens out into the exhaust gas collection chamber and the other end of which is connected to a connection opening of the combustion chamber closure and from there connected to the burner.
  • connection is established by means of a blower arranged on the suction side behind the connection opening of the combustion chamber closure and connected to the burner on the pressure side.
  • the fan sucking the exhaust gases is connected to an annular exhaust gas supply chamber surrounding the mixing chamber of the burner and opening out in the region of the burner mouth.
  • the firebox lock will generally be a swiveling boiler lock door
  • an advantageous further development is that the firebox lock-side end of the at least one tubular displacer body is drawn inwards and thus engages in the connection opening of the combustion chamber closure provided with an annular soft seal.
  • combustion chamber lock doors are regularly provided with a heat insulation block in which a corresponding opening with a receptacle for a sealing ring can be provided without further ado.
  • the intended retraction of the pipe end can be rounded, but also be conical and depends on the degree of its retraction according to the swivel radius of the opening edge to be observed in this area.
  • the part of the exhaust gas recirculation pipe that protrudes from the relevant exhaust gas pipe and extends to the combustion chamber closure is not insulated, but in this respect the boiler is advantageously designed such that the at least one exhaust gas recirculation pipe passes through the deflection chamber from the combustion chamber to the openings of the exhaust gas pipe with its area on the combustion chamber closure side.
  • the exhaust gas recirculation pipe is arranged in the exhaust gas pipe that extends centrally over the combustion chamber. Also from the same point of view, but also the additional shortest possible transfer path from the exhaust gas blower to the burner, there is the requirement that both the exhaust gas intake blower and the burner blower are arranged on the combustion chamber closure axis-parallel to the combustion chamber axis.
  • the solution according to the invention also has the advantage that the recirculated Exhaust gases do not reach the flame area, which has to be cooled for the purpose of NOX reduction, too cold and, due to their temperature, reliably prevent condensation in the area of the burner.
  • This type of exhaust gas recirculation with the help of a displacement body replaced by a pipe not only has the advantage that existing boilers of this type can be converted to exhaust gas recirculation without any problems, and exhaust gas recirculation can be accomplished using very simple design means, but there is also the advantage that that the exhaust gas flue (s) correspondingly equipped with exhaust gas return flow tubes are fully preserved as such for the heat transfer.
  • the boiler shown as an exemplary embodiment consists of a water-carrying housing 1, in which a combustion chamber 3 equipped with a burner 2 (here reverse combustion chamber) is arranged, from which several exhaust gas pipes 4 penetrating the water-carrying housing 1 lead to the exhaust gas collection chamber 5, in which exhaust gas displacement body 6 is used Formation of elongated, ring-cylindrical exhaust gas flues 7 are arranged. It is essential in this boiler that in at least one of the exhaust gas pipes 4 the displacer 6 is designed as a pipe which opens out into the exhaust gas collection chamber 5 and whose other end 8 is connected to a connection opening 9 of the combustion chamber closure 10 and from there to the burner 2 connected is.
  • the combustion chamber closure 10 is designed as a swing-out closure door and on the combustion chamber side with a corresponding one Heat insulation block 19 equipped, which in this case also contains the connection opening 9 for the end 8 of the tube through which a portion of the exhaust gases drawn in from the exhaust gas collection chamber 5 flows in and is fed to the burner 2.
  • that exhaust gas pipe 4 is selected for the backflow of the exhaust gases, which, as shown, extends centrally over the combustion chamber 3 and immediately adjacent to it. This results in sufficient space in front of the combustion chamber closure 10 for the arrangement of the blower 11, which draws in the exhaust gases from the exhaust gas collection chamber 5, this arrangement resulting in an extremely short path for the exhaust gases to the actual burner 2.
  • the exhaust gases are not introduced directly into the burner 2, but rather into an annular exhaust gas supply chamber 13 surrounding the mixing chamber 12 of the burner 2, which opens out in the region of the burner mouth 2 ' the burner 2, both the exhaust gas intake fan 11 and the burner fan 14 are arranged axially parallel to the combustion chamber axis 15 on the combustion chamber closure 10, as shown.
  • the combustion chamber closure-side end 8 of the exhaust gas recirculation pipe is drawn inwards, which with this recess 21 (see FIG. 2) into the connection opening 9 provided with an annular soft seal 16 of the furnace lock 10 engages.
  • the exhaust gas recirculation pipe passes through the deflection chamber 17 from the combustion chamber 3 to the openings 18 of the exhaust gas pipes 4 with its combustion chamber closure-side region 6 '.

Abstract

The heating boiler is intended for burning liquid or gaseous fuels and consists of a water-bearing housing (1), in which a firebox (3) fitted with the burner (2) is arranged, from which firebox a number of waste gas flues (4), which extend through the water-bearing housing (1), lead to the waste gas collecting chamber (5), in which flues waste gas displacement members (6) are arranged for the purpose of forming elongate annular cylindrical waste gas flues (7). In order to be able, on such a boiler, to bring about waste gas recycling using the most simple means, the heating boiler is according to the invention designed in such a manner that, in at least one of the waste gas flues (4), the displacement member (6) is designed as a waste gas return pipe (20) which opens freely in the waste gas collecting chamber (5) and the other end (8) of which is connected to a connection opening (9) of the firebox closure (10) and, from there, is connected to the burner (2). <IMAGE>

Description

Die Erfindung betrifft einen Heizkessel zum Verbrennen flüssiger oder gasförmiger Brennstoffe gemäß dem Oberbegriff des Hauptanspruches. Ein solcher Kessel ist bekannt aus EP-A-0 296 276.The invention relates to a boiler for burning liquid or gaseous fuels according to the preamble of the main claim. Such a boiler is known from EP-A-0 296 276.

Heizkessel der genannten Art sind allgemein bekannt und in Benutzung und bedürfen insoweit keines besonderen druckschriftlichen Nachweises. Zwecks Reduzierung des sogenannten NOX-Anteiles in den Abgasen, der neben anderen schädlichen Gasanteilen die Umwelt belastet, ist es bereits bekannt, einen Teil der Abgase abzuzweigen, dem Brenner wieder zuzuführen und der Verbrennungsluft beizumischen. Siehe hierzu den Aufsatz "Rauchgasrezirkulationsanlage" der Firma Elring GmbH und DEPA GmbH in der DE-Z "Chemie-Anlagen+Verfahren" 1986, November, und den Sonderdruck aus der DE-Z "gas wärme international", Band 32, Heft 1, 1983, Seiten 40-46. Insbesondere nach dem erstgenannten Aufsatz ist es danach bereits bekannt, einen Teil der Abgase mit einem Zusatzgebläse abzusaugen und diese den Feuerraumgebläsen bzw. der Feuerung wieder zuzuführen, um damit die Verbrennungstemperaturen und den NOX-Anteil der entstehenden Abgase zu reduzieren. Abgesehen davon geschieht die Abgasrückführung bisher auch in der Weise, daß man eine äußere, gut wärmeisolierte Leitung außerhalb des Kessels vorsieht, die den Gasabzugsbereich des Kessels mit der Saugseite des Brennergehäuses verbindet. Ähnliche Abgasrückführungen beschreiben auch folgende Druckschriften: DE-U-87 08 656, DE-U-87 16 240 und DE-U-88 12 090.Boilers of the type mentioned are generally known and in use and therefore do not require any special printed evidence. In order to reduce the so-called NOx content in the exhaust gases, which pollutes the environment in addition to other harmful gas components, it is already known to branch off some of the exhaust gases, to feed them back to the burner and to add them to the combustion air. See the article "Flue gas recirculation system" from Elring GmbH and DEPA GmbH in DE-Z "Chemical plants + processes" 1986, November, and the special print from DE-Z "gas warm international", volume 32, volume 1, 1983, pages 40-46. According to the first article in particular, it is already known afterwards to extract part of the exhaust gases with an additional fan and to feed them back to the combustion chamber fans or the furnace in order to reduce the combustion temperatures and the NOx content of the resulting gases. Apart from this, the exhaust gas recirculation has so far also taken place in such a way that an external, well-heat-insulated line is provided outside the boiler, which connects the gas extraction area of the boiler to the suction side of the burner housing. The following documents also describe similar exhaust gas recirculation systems: DE-U-87 08 656, DE-U-87 16 240 and DE-U-88 12 090.

Allen diesen bekannten AUsführungsformen ist gemeinsam, daß mehr oder weniger lange Abgasrückführleitungen vorgesehen werden müssen, daß - soweit Gebläse für die Rückführung vorgesehen sind - es sich dabei um zusätzliche Gebläse mit Separatantrieb handelt, und daß schließlich die Abgase direkt in die Zuluftöffnung oder das Brennermischrohr eingeleitet werden, und damit der eigentliche Brenner mit seinem Düsenstock mit dem zugeführten Abgas belastet wird. Beim DE-U- 88 12 090 ist außerdem in Betracht gezogen, offenbar um eine solche Brennerbelastung zu vermeiden, die Ausmündung der Abgasrückführleitung in den Flammbereich des Brenners zu richten. Für Heizkessel der eingangs genannten Art, also solche mit horizontal angeordneter Längsachse des Feuerraums, um den herum oder über dem Abgaszugrohre von einer Umlenkkammer aus zur Abgassammelkammer führen, sind diese bekannten Einrichtungen zur Abgasrückführung jedoch nicht ohne weiteres geeignet, da hierbei der Brenner einerseits und die Abgassammelkammer andererseits sich gerade an den entgegengesetzten Enden des Kessel befinden. Für solche Kessel ist es zwar bereits bekannt, die am höchsten liegenden Abgaszugrohre nicht als solche, sondern ausschließlich als Abgasrückführungskanäle zu nutzen. Das wird aber mit einem Verlust entsprechender Heizfläche erkauft.All these known designs have in common that more or less long exhaust gas recirculation lines must be provided, that - insofar as fans are provided for the recirculation - it is an additional fan with a separate drive, and that the exhaust gases are finally introduced directly into the supply air opening or the burner mixing tube, and thus the actual burner with its nozzle assembly is loaded with the supplied exhaust gas. In DE-U-88 12 090 it is also considered, apparently to avoid such burner load, to direct the mouth of the exhaust gas recirculation line into the flame area of the burner. For boilers of the type mentioned above, i.e. those with a horizontally arranged longitudinal axis of the combustion chamber, around or around which the exhaust gas pipes lead from a deflection chamber to the exhaust gas collection chamber, these known devices for exhaust gas recirculation are not suitable, however, since the burner on the one hand and the The flue gas collection chamber, on the other hand, is located at the opposite ends of the boiler. For such boilers, it is already known not to use the highest flue gas exhaust pipes as such, but only as exhaust gas recirculation channels. But this is bought with a loss of the corresponding heating surface.

Bei einem Heizkessel nach der CH-Z HLH Bd. 40 (1989) Nr. 2, Seiten 78, 79, bei dem es sich um einen Mehrzugkessel mit nach hinten offener Brenkammer handelt, die allein wassergekühlt ist, ist im oberen, noch sehr heißen Bereich eine besondere Abgasrückführleitung vorgesehen, in der zwangsläufig der aus der Rauchgassammelkammer abgezogene Abgasanteil wieder eine unerwünschte Aufwärmung erfährt.In a boiler according to CH-Z HLH Vol. 40 (1989) No. 2, pages 78, 79, which is a multi-pass boiler with an open-back combustion chamber that is water-cooled alone, the top is still very hot A special exhaust gas recirculation line is provided in the area, in which the exhaust gas portion withdrawn from the flue gas collection chamber inevitably experiences an undesired warming up again.

Ausgehend von einem Heizkessel der eingangs genannten Art liegt der Erfindung die Aufgabe zugrunde, mit einfachsten Mitteln und unter Ausnutzung der konstruktiven Gegebenheiten derartiger Kessel mit geringstmöglichen konstruktiven Änderungen für eine Abgasrückführung sorgen zu können.Starting from a boiler of the type mentioned, the object of the invention is to be able to provide exhaust gas recirculation with the simplest possible means and using the structural conditions of such boilers with the least possible design changes.

Diese Aufgabe ist mit einem Heizkessel der eingangs genannten Art nach der Erfindung durch die im Kennzeichen des Hauptanspruches angeführten Merkmale gelöst.This object is achieved with a boiler of the type mentioned according to the invention by the features stated in the characterizing part of the main claim.

Mit der Erfindung wird der Umstand ausgenutzt, daß zwecks Optimierung der Wärmeübertragung aus den Abgaszügen zum Kesselwasser die Abgaszugrohre derartiger Kessel in der Regel mit sog. Verdrängungskörpern versehen sind, um damit zu erreichen, daß die Abgase an den Abgasrohrwänden entlangstreichen, wobei in der Regel derartige Abgaszüge im Freiraum zwischen den Verdrängungskörpern und der Rohrwand mit Längsrippen versehen sind. Da es sich dabei um reine Verdrängungskörper handelt, nehmen diese an der Wärmeübertragung nicht teil. Nach der Erfindung ausgenutzt wird nun ein solcher Verdrängerkörper für die Abgasrückführung, indem dieser als beidendig offenes Rohr ausgebildet ist, dessen hinteres Ende offen in der Abgassammelkammer ausmündet und dessen anderes Ende an eine Anschlußöffnung des Feuerraumverschlusses angeschlossen und von da aus mit dem Brenner verbunden ist. Der einzige, dafür erforderliche konstruktive Eingriff besteht also lediglich in einer entsprechend anderen Gestaltung des Verdrängerkörpers in Form eines Rohres, das nur etwas länger gehalten werden muß, um das Rohr an die Anschlußöffnung im Feuerraumverschluß anschließen zu können. Unter der Maßgabe, daß das Rohr von der Anschlußöffnung aus mit dem Brenner verbunden sein soll, ist dabei nicht eine etwaige entsprechende Verlängerung des Rohres zu verstehen, sondern eine davon unabhängige Verbindung, die außerhalb des Feuerraumes zum Brenner führt. Zweckmäßig und vorteilhaft ist dabei bevorzugt vorgesehen, die Verbindung mittels eines hinter der Anschlußöffnung des Feuerraumverschlusses saugseitig angeordneten Gebläses herzustellen, das druckseitig mit dem Brenner in Verbindung steht. Um die rückgeführten Abgase nicht unmittelbar in den Brenner einzuleiten und diesen damit zu belasten, ist das die Abgase ansaugende Gebläse mit einer die Mischkammer des Brenners umgebenden, ringförmigen, im Bereich der Brennermündung ausmündenden Abgaszufuhrkammer verbunden.The invention takes advantage of the fact that, for the purpose of optimizing the heat transfer from the flue gases to the boiler water, the flue gas pipes of such boilers are generally provided with so-called displacement bodies in order to ensure that the flue gases sweep along the walls of the flue pipe, as a rule such Exhaust pipes in the space between the displacement bodies and the pipe wall are provided with longitudinal ribs. Since these are pure displacement bodies, they do not take part in the heat transfer. According to the invention, such a displacer is now used for the exhaust gas recirculation, in that it is designed as a tube that is open at both ends, the rear end of which opens out into the exhaust gas collection chamber and the other end of which is connected to a connection opening of the combustion chamber closure and from there connected to the burner. The only constructive intervention required for this is therefore only a correspondingly different design of the displacer in the form of a tube, which only has to be held a little longer in order to be able to connect the tube to the connection opening in the combustion chamber closure. The proviso that the pipe should be connected to the burner from the connection opening is not to be understood as a possible corresponding extension of the pipe, but rather an independent connection which leads to the burner outside the combustion chamber. Appropriately and advantageously, it is preferably provided that the connection is established by means of a blower arranged on the suction side behind the connection opening of the combustion chamber closure and connected to the burner on the pressure side. In order not to introduce the recirculated exhaust gases directly into the burner and thus to burden the latter, the fan sucking the exhaust gases is connected to an annular exhaust gas supply chamber surrounding the mixing chamber of the burner and opening out in the region of the burner mouth.

Da es sich beim Feuerraumverschluß in der Regel um eine abschwenkbare Kesselverschlußtür handeln wird, besteht eine vorteilhafte Weiterbildung darin, daß das feuerraumverschlußseitige Ende des mindestens einen rohrförmig ausgebildeten Verdränger körpers nach innen eingezogen ist und damit in die mit einer ringförmigen Weichdichtung versehenen Anschlußöffnung des Feuerraumverschlusses eingreift. Dies ist problemlos zu bewältigen, da Feuerraumverschlußtüren regelmäßig mit einem Wärmeisolationsblock versehen sind, in dem ohne weiteres eine entsprechende Öffnung mit einer Aufnahme für einen Dichtungsring vorgesehen werden kann. Die vorgesehene Einziehung des Rohrendes kann dabei abgerundet, aber auch kegelförmig gestaltet sein und richtet sich mit dem Grad ihrer Einziehung nach dem in diesem Bereich zu beachtenden Schwenkradius des Öffnungsrandes.Since the firebox lock will generally be a swiveling boiler lock door, an advantageous further development is that the firebox lock-side end of the at least one tubular displacer body is drawn inwards and thus engages in the connection opening of the combustion chamber closure provided with an annular soft seal. This can be managed without any problems, since combustion chamber lock doors are regularly provided with a heat insulation block in which a corresponding opening with a receptacle for a sealing ring can be provided without further ado. The intended retraction of the pipe end can be rounded, but also be conical and depends on the degree of its retraction according to the swivel radius of the opening edge to be observed in this area.

Der aus dem betreffenden Abgaszugrohr herausragende und bis zum Feuerraumverschluß reichende Teil des Abgasrückführrohres wird nicht etwa isoliert, sondern diesbezüglich ist der Kessel vorteilhaft derart ausgebildet, daß das mindestens eine Abgasrückführrohr die Umlenkkammer vom Feuerraum zu den Einmündungen der Abgaszugrohre mit seinem feuerraumverschlußseitigen Bereich durchgreift. Dies hat den zusätzlichen Vorteil, daß die zurückströmenden Abgase aufgewärmt in das Gebläse und damit in den Brenner gelangen, womit der Gefahr begegnet ist, daß die Abgase im Gebläse bzw. im Brenner kondensieren können, was diese Elemente im Laufe der Zeit entsprechend schädigen würde.The part of the exhaust gas recirculation pipe that protrudes from the relevant exhaust gas pipe and extends to the combustion chamber closure is not insulated, but in this respect the boiler is advantageously designed such that the at least one exhaust gas recirculation pipe passes through the deflection chamber from the combustion chamber to the openings of the exhaust gas pipe with its area on the combustion chamber closure side. This has the additional advantage that the exhaust gases flowing back get warmed up into the blower and thus into the burner, which counteracts the risk that the exhaust gases can condense in the blower or in the burner, which would damage these elements accordingly over time.

Um das Abgasgebläse und den Brenner räumlich kompakt auf der äußeren Frontfläche des Feuerraumverschlusses anordnen zu können, ist das Abgasrückführrohr in demjenigen Abgaszugrohr angeordnet, das sich mittig über dem Feuerrraum erstreckt. Ebenfalls unter dem gleichen Gesichtspunkt, aber auch dem zusätzlichen einer möglichst kurzen Überleitungsstrecke vom Abgasgebläse zum Brenner, steht die Maßgabe, daß sowohl das Abgasansauggebläse als auch das Brennergebläse achsparallel zur Feuerraumachse am Feuerraumverschluß angeordnet sind.In order to be able to arrange the exhaust gas blower and the burner in a spatially compact manner on the outer front surface of the combustion chamber closure, the exhaust gas recirculation pipe is arranged in the exhaust gas pipe that extends centrally over the combustion chamber. Also from the same point of view, but also the additional shortest possible transfer path from the exhaust gas blower to the burner, there is the requirement that both the exhaust gas intake blower and the burner blower are arranged on the combustion chamber closure axis-parallel to the combustion chamber axis.

Abgesehen von der konstruktiv wenig aufwendigen Abgasrückführung, die sich lediglich auf den Ersatz eines Verdrängerkörpers durch ein Abgasrückführrohr beschränkt, hat also die erfindungsgemäße Lösung noch den Vorteil, daß die rückgeführten Abgase den Flammbereich, den es ja zwecks NOX-Reduzierung zu kühlen gilt, nicht zu kalt erreichen und aufgrund ihrer Temperatur einen Kondensatanfall im Bereich des Brenners mit Sicherheit verhindern.Apart from the structurally inexpensive exhaust gas recirculation, which is only limited to the replacement of a displacer by an exhaust gas recirculation pipe, the solution according to the invention also has the advantage that the recirculated Exhaust gases do not reach the flame area, which has to be cooled for the purpose of NOX reduction, too cold and, due to their temperature, reliably prevent condensation in the area of the burner.

Diese Art der Abgasrückführung mit Hilfe eines durch ein Rohr ersetzten Verdrängerkörpers hat nicht nur den Vorteil, daß bestehende Kessel dieser Art problemlos auf eine Abgasrückführung umgerüstet werden können, und die Abgasrückführung mit konstruktiv sehr einfachen Mitteln bewerkstelligt werden kann, sondern es besteht auch der Vorteil, daß das bzw. die entsprechend mit Abgasrückstromrohren ausgestatteten Abgaszüge als solche für den Wärmeübergang voll erhalten bleiben.This type of exhaust gas recirculation with the help of a displacement body replaced by a pipe not only has the advantage that existing boilers of this type can be converted to exhaust gas recirculation without any problems, and exhaust gas recirculation can be accomplished using very simple design means, but there is also the advantage that that the exhaust gas flue (s) correspondingly equipped with exhaust gas return flow tubes are fully preserved as such for the heat transfer.

Nachfolgend wird anhand der zeichnerischen Darstellung ein Ausführungsbeispiel der Erfindung erläutert.An exemplary embodiment of the invention is explained below with reference to the drawing.

Es zeigt schematisch

  • Fig. 1 einen Längsschnitt durch einen Heizkessel und
  • Fig. 2 im Schnitt eine konstruktive Einzelheit.
It shows schematically
  • Fig. 1 shows a longitudinal section through a boiler and
  • Fig. 2 in section a constructive detail.

Der als Ausführungsbeispiel dargestellte Heizkessel besteht aus einem wasserführenden Gehäuse 1, in dem ein mit einem Brenner 2 bestückter Feuerraum 3 (hier Umkehrbrennkammer) angeordnet ist, von dem mehrere, das wasserführende Gehäuse 1 durchgreifende Abgaszugrohre 4 zur Abgassammelkammer 5 führen, in denen Abgasverdrängerkörper 6 zwecks Ausbildung langgestreckter, ringzylindrischer Abgaszüge 7 angeordnet sind. Wesentlich an diesem Kessel ist nun, daß in mindestens einem der Abgaszugrohre 4 der Verdrängerkörper 6 als Rohr ausgebildet ist, das offen in der Abgassammelkammer 5 ausmündet und dessen anderes Ende 8 an eine Anschlußöffnung 9 des Feuerraumverschlusses 10 angeschlossen und von da aus mit dem Brenner 2 verbunden ist. Der Feuerraumverschluß 10 ist im Ausführungsbeispiel als ausschwenkbare Verschlußtür ausgebildet und feuerraumseitig mit einem entsprechenden Wärmeisolationsblock 19 ausgestattet, der in diesem Falle auch die Anschlußöffnung 9 für das Ende 8 des Rohres enthält, durch das ein Teil der aus der Abgassammelkammer 5 angesaugten Abgase zuströmt und dem Brenner 2 zugeleitet wird. In Rücksicht auf die Konstruktionsverhältnisse und Unterbringungsmöglichkeiten des Brenners 2 an der Tür, ist dasjenige Abgaszugrohr 4 für die Rückströmung der Abgase ausgewählt, das sich, wie dargestellt, mittig über dem Feuerraum 3 und unmittelbar benachbart zu diesem erstreckt. Dadurch ergibt sich genügend Raum vor dem Feuerraumverschluß 10 für die Anordnung des Gebläses 11, das die Abgase aus der Abgassammelkammer 5 ansaugt, wobei sich durch diese Anordnung ein außerordentlich kurzer Weg für die Abgase zum eigentlichen Brenner 2 ergibt. Vorteilhaft werden dabei die Abgase nicht direkt in den Brenner 2 eingeleitet, sondern in eine die Mischkammer 12 des Brenners 2 umgebende, ringförmige, im Bereich der Brennermündung 2′ ausmündende Abgaszufuhrkammer 13. Ebenfalls im Sinne einer günstigen und kurzwegigen Überleitung der Abgase vom Gebläse 11 in den Brenner 2, sind sowohl das Abgasansauggebläse 11 als auch das Brennergebläse 14 achsparallel zur Feuerraumachse 15 am Feuerraumverschluß 10, wie dargestellt, angeordnet.The boiler shown as an exemplary embodiment consists of a water-carrying housing 1, in which a combustion chamber 3 equipped with a burner 2 (here reverse combustion chamber) is arranged, from which several exhaust gas pipes 4 penetrating the water-carrying housing 1 lead to the exhaust gas collection chamber 5, in which exhaust gas displacement body 6 is used Formation of elongated, ring-cylindrical exhaust gas flues 7 are arranged. It is essential in this boiler that in at least one of the exhaust gas pipes 4 the displacer 6 is designed as a pipe which opens out into the exhaust gas collection chamber 5 and whose other end 8 is connected to a connection opening 9 of the combustion chamber closure 10 and from there to the burner 2 connected is. In the exemplary embodiment, the combustion chamber closure 10 is designed as a swing-out closure door and on the combustion chamber side with a corresponding one Heat insulation block 19 equipped, which in this case also contains the connection opening 9 for the end 8 of the tube through which a portion of the exhaust gases drawn in from the exhaust gas collection chamber 5 flows in and is fed to the burner 2. In view of the design conditions and accommodation options of the burner 2 on the door, that exhaust gas pipe 4 is selected for the backflow of the exhaust gases, which, as shown, extends centrally over the combustion chamber 3 and immediately adjacent to it. This results in sufficient space in front of the combustion chamber closure 10 for the arrangement of the blower 11, which draws in the exhaust gases from the exhaust gas collection chamber 5, this arrangement resulting in an extremely short path for the exhaust gases to the actual burner 2. Advantageously, the exhaust gases are not introduced directly into the burner 2, but rather into an annular exhaust gas supply chamber 13 surrounding the mixing chamber 12 of the burner 2, which opens out in the region of the burner mouth 2 ' the burner 2, both the exhaust gas intake fan 11 and the burner fan 14 are arranged axially parallel to the combustion chamber axis 15 on the combustion chamber closure 10, as shown.

In Rücksicht auf die Abschwenkbarkeit, aber auch den möglichst dichten Anschluß des Rückstromrohres an die Anschlußöffnung 9 ist das feuerraumverschlußseitige Ende 8 des Abgasrückführrohres nach innen eingezogen, das mit dieser Einziehung 21 (siehe Fig. 2) in die mit einer ringförmigen Weichdichtung 16 versehene Anschlußöffnung 9 des Feuerraumverschlusses 10 eingreift. Bei der dargestellten Ausführungsform ergibt sich außerdem, daß das Abgasrückführrohr die Umlenkkammer 17 vom Feuerraum 3 zu den Einmündungen 18 der Abgaszugrohre 4 mit seinem feuerraumverschlußseitigen Bereich 6′ durchgreift.In view of the pivotability, but also the tightest possible connection of the return flow pipe to the connection opening 9, the combustion chamber closure-side end 8 of the exhaust gas recirculation pipe is drawn inwards, which with this recess 21 (see FIG. 2) into the connection opening 9 provided with an annular soft seal 16 of the furnace lock 10 engages. In the illustrated embodiment, it also results that the exhaust gas recirculation pipe passes through the deflection chamber 17 from the combustion chamber 3 to the openings 18 of the exhaust gas pipes 4 with its combustion chamber closure-side region 6 '.

Claims (7)

  1. A heating boiler for the combustion of liquid or gaseous fuels, comprising a water-carrying housing (1) in which is disposed a firing chamber (3) furnished with a burner (2), from which a plural number of exhaust gas tubings (4) extending through the water-carrying housing (1) lead to an exhaust gas collecting chamber (5) in which are disposed exhaust gas displacers (6) for forming elongated ring-cylindrical exhaust gas tubings (7),
    characterized in
    that in at least one of the exhaust gas tubings (4), the displacer (6) is formed as an exhaust gas return tube (20) opening into the exhaust gas collecting chamber (5), with the other end (8) thereof being in communication with a connecting opening (9) of the closure (10) of the firing chamber whence it is in communication with the burner (2).
  2. A heating boiler according to claim 1,
    characterized in that a blower (11), on the intake side, is connected behind the connecting opening (9) of the closure (10) of the firing chamber, which blower, on the pressure side, is in communication with the burner (2).
  3. A heating boiler according to claim 2,
    characterized in
    that the blower (11) is in communication with an annular exhaust gas supply chamber (13) surrounding a mixing chamber (12) of the burner (2) and terminating in the area of the burner outlet (2′).
  4. A heating boiler according to claims 2 or 3,
    characterized in
    that the end (6′) of the at least one exhaust gas return tube (20), on the closure-sided end (6′) of the firing chamber, is inwardly retracted and with the said end (6′) is in engagement with the connecting opening (9) of the closure (10) of the firing chamber, provided with an annnular soft sealant (16).
  5. A heating boiler according to any one of claims 1 to 4,
    characterized in
    that at least one exhaust gas return tube (20) extends, with the area (6′) of the closure side of the firing chamber, through the deflection chamber (17) from the firing chamber (2) to the inlets (18) of the exhaust gas tubings (4).
  6. A heating boiler according to any one of claims 1 to 5,
    characterized in
    that at least one exhaust gas return tube (20) is disposed in an exhaust gas tubing (4) extending centrally across the firing chamber (3) in the water-carrying housing (1).
  7. A heating boiler according to any one of claims 2 to 6,
    characterized in
    that both the exhaust gas intake blower (11) and a burner blower (14) are disposed on the firing chamber closure (10) in a manner axially parallel to the axis (15) of the firing chamber.
EP90120992A 1989-12-05 1990-11-02 Heating boiler burning liquid or gaseous fuels Expired - Lifetime EP0431314B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90120992T ATE86369T1 (en) 1989-12-05 1990-11-02 BOILERS FOR COMBUSTING LIQUID OR GASEOUS FUELS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3940165A DE3940165C1 (en) 1989-12-05 1989-12-05
DE3940165 1989-12-05

Publications (3)

Publication Number Publication Date
EP0431314A2 EP0431314A2 (en) 1991-06-12
EP0431314A3 EP0431314A3 (en) 1991-07-31
EP0431314B1 true EP0431314B1 (en) 1993-03-03

Family

ID=6394831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90120992A Expired - Lifetime EP0431314B1 (en) 1989-12-05 1990-11-02 Heating boiler burning liquid or gaseous fuels

Country Status (3)

Country Link
EP (1) EP0431314B1 (en)
AT (1) ATE86369T1 (en)
DE (1) DE3940165C1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132435C1 (en) * 1991-09-28 1993-04-22 Hans Dr. 3559 Battenberg De Viessmann

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8516607U1 (en) * 1985-06-07 1985-07-25 Buderus Ag, 6330 Wetzlar Device for returning exhaust gases from a heating boiler to the burner
DE8708644U1 (en) * 1987-06-22 1988-11-03 Viessmann, Hans, Dr., 3559 Battenberg, De

Also Published As

Publication number Publication date
DE3940165C1 (en) 1991-04-18
EP0431314A2 (en) 1991-06-12
ATE86369T1 (en) 1993-03-15
EP0431314A3 (en) 1991-07-31

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