EP0796412B1 - Gas burner for heaters,especially water heaters - Google Patents
Gas burner for heaters,especially water heaters Download PDFInfo
- Publication number
- EP0796412B1 EP0796412B1 EP95936980A EP95936980A EP0796412B1 EP 0796412 B1 EP0796412 B1 EP 0796412B1 EP 95936980 A EP95936980 A EP 95936980A EP 95936980 A EP95936980 A EP 95936980A EP 0796412 B1 EP0796412 B1 EP 0796412B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- burner
- plate
- burner plate
- gas burner
- channels
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/78—Cooling burner parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/18—Radiant burners using catalysis for flameless combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/10—Flame diffusing means
- F23D2203/108—Flame diffusing means with stacked sheets or strips forming the outlets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2215/00—Fins
- F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities
Definitions
- the invention is based on gas burners according to the genus Main claim.
- the channels in the burner plate are formed between individual plate elements, the edges of which on the combustion chamber side all lie in a common exit plane.
- the flame roots only touch the burner plate with their apex regions, so that a heat flow that cools the flames via the burner plate into the heat-dissipating medium is only possible to a limited extent. This also restricts the effort for the burner to have as large a surface load as possible if the flame temperature is not to rise to an area which is harmful with respect to the formation of NO x .
- the arrangement according to the invention with the characterizing features of the main claim has the advantage that the flames are cooled in their root area over a defined area extending beyond the apex area so that even higher surface loads of the burner or the burner plate are possible without result in inadmissibly high NO x values.
- the distinctive structuring of the burner plate can be achieved by not between two set back sheet metal ribs a set back or shortened sheet metal rib is provided. At An execution has proven to be particularly advantageous pointed out, in which between two not set back sheet metal ribs two shorter sheet metal ribs are arranged side by side.
- the channels in the burner plate In the formation of the channels in the burner plate is make sure that they have at least one Longitudinal section a width or a diameter have the or the smaller than the so-called Extinguishing distance is so that the flames do not fight back can.
- the Opening diameter or their mesh size is smaller than the rib spacing.
- Burner plate can also be made from an inflow hole provided, connected to the heat-dissipating pipe system Base plate and a variety of on the base plate attached pins are made between the channels form for the passage of the fuel-air mixture.
- the burner plate can consist of a honeycomb structure and an associated base plate exist with the heat-dissipating pipe system connected and in the channels the inflow holes opening into the honeycomb structure is.
- the honeycomb structure is suggested, this by shortened To train inserts in the individual honeycombs.
- the formation of harmful NO x emissions can be further counteracted if the walls of the channels for the fuel / air mixture flowing through are catalytically coated at least in the region of their end sections on the combustion chamber side.
- the burner plate must be designed by appropriate dimensioning or material selection so that the surface temperature is approximately 600 ° C.
- Such a catalytic burner is started in a conventional manner with flames burning freely at the fin or honeycomb ends. After the burner plate has been heated to the operating temperature of the catalyst coating, the flames withdraw into the catalytically active region.
- the gas burner as a heat source for a water heater can be advantageous with the burner plate Pipe system of the water to be heated connected in a heat-conducting manner be flowed through and the pipe system with the burner plate form a heat exchanger unit of the water heater.
- one of the combustion gases of the Gas burner's heat exchanger is smaller than at a version with uncooled burner.
- FIG. 1 shows a water heater with a Gas burner according to the first embodiment
- Figure 2 enlarges the burner plate of the gas burner according to FIG. 1 and Figures 3 and 4 each a modification of the burner plate according to Figure 2.
- Figures 5 and 6 are the burner plates according to the second and third embodiments shown.
- Figure 7 shows a plan view of the Burner plate according to FIG. 6.
- the water heater according to FIG. 1 has a housing 10 a gas burner 12, under which a fuel-air mixture Blower pressure is supplied in the direction of arrow A. Downstream of the gas burner 12 sits in the housing 10 Exhaust gas heat exchanger 14, which is from a pipe system 16th is penetrated, which leads the water to be heated. The Pipe system 16 is via a line 18 to a second Connected pipe system 20, which is integrated into the gas burner 12 is. An ignition device 22 is located downstream of the gas burner 12 attached to the housing 10 for starting the heater.
- the gas burner 12 has a burner plate 24 that is made of sheet ribs 26, 28 of different lengths (FIG. 2) is constructed.
- the sheet metal fins 26, 28 are in good condition thermally conductive contact with the pipe system 20 and are through this connected to a rigid unit.
- Between Sheet metal ribs 26, 28 are column 30 for the passage of the Fuel-air mixture formed.
- the width a of the column 30 is smaller than the so-called extinguishing distance, see above that flames are not in the burner plate 24 or in kick back any mixing zone in front of it can.
- the burner plate 24 is designed so that the shorter ones Sheet metal ribs 28 each between two longer sheet metal ribs 26 stand.
- the arrangement is such that the Margins 32 of the shorter sheet metal fins 28 on the combustion chamber side opposite the edges 34 of the longer sheet metal ribs 26 are reset. This results in the combustion chamber side wall of the burner plate 24 a strong tiered surface structuring with wide Spaces 36 laterally through wall areas 38 of the longer sheet metal ribs 26 are limited.
- the mixture After igniting the burner, the mixture reacts between or at the downstream edges 32, 34 of the Sheet metal fins 26, 28 with flame formation, whereby Heat of reaction from the flame roots over the sheet metal fins 26, 28 reaches the water to be heated in the pipe system 20.
- the flame roots are particularly well cooled, because they also have side contact with the wall areas 38 of the Have sheet metal fins 26.
- the two reaction to the Burner plate 24 resulting combustion gases flow through the exhaust gas heat exchanger 14, where it transfers heat to the one to be heated Dispense water in the pipe system 16.
- the modified version 3 is a burner plate 40, in each case two shortened sheet metal ribs 28 between the longer ones Sheet metal ribs 26 are arranged. This still results wider gaps 42 which the wall on the combustion chamber side structure the burner plate 40 particularly strongly.
- Burner plate 44 made of different long metal ribs 46, 48 built up by the cooling pipe system 20 rigid interconnected and their combustion chamber side End sections are coated catalytically.
- the input side is the burner plate 44 with a Provide lattice structure 50 whose mesh size is smaller than is the width of the gap between the sheet metal fins 46, 48.
- the thermal conductivity of the metal fins 46, 48 is through Dimensioning and / or choice of materials based on the burner output matched that their surface temperature on to Example sets 600 ° C.
- On the metal ribs 46, 48 takes place a catalytic combustion takes place in which compared to the formation of an uncoated version Pollutants is reduced even further.
- the burner is started in a conventional manner one at the ends of the sheet metal fins 46, 48 on the combustion chamber side free burning flame. After heating the sheet metal fins 46, 48 to the operating temperature of the catalyst coating the flame pulls into the catalytically active area the burner plate 44 back.
- FIG 5 is a burner plate 52 with different lengths Pins 54, 56 populated, the channels 58 between them for the Passage of the fuel-air mixture and on the combustion chamber side wider spaces 60 for extensive touching the Form flame roots.
- Pins 54, 56 are on one Fixed base plate 62, the narrow inflow holes 64th is provided for the fuel-air mixture and at the same time.
- a thermally conductive connection to a water leading Pipe system 66 that is, for example extends meandering over the surface of the base plate 62.
- the exemplary embodiment according to FIGS. 6 and 7 differs from the above in that a Burner plate 68 from that connected to the pipe system 66 Base plate 62 and a honeycomb structure 70 attached to it consists. This is made of hexagonal, without any gaps Individual honeycomb 72 formed in the cavities Inflow bores 64 of the base plate 62 open out.
- Burner plate 68 can, as in Figures 6 and 7 on the right the cavities of the individual honeycombs 72 or one is shown Part of the individual honeycombs 72 through on the base plate 62 attached, preferably also honeycomb-shaped inserts 74 be narrowed, which are shorter than the individual honeycombs 72 are and a gradation of the wall of the combustion chamber Effect burner plate.
Description
Die Erfindung geht aus von Gasbrennern nach der Gattung des Hauptanspruchs.The invention is based on gas burners according to the genus Main claim.
Bei bekannten Gasbrennern dieser Gattung (EP 0 404 260 A1) sind die Kanäle in der Brennerplatte zwischen einzelnen Plattenelementen gebildet, deren brennraumseitige Randkanten allesamt in einer gemeinsamen Austrittsebene liegen. Bei dieser Ausführung berühren die Flammenwurzeln die Brennerplatte nur mit ihren Scheitelbereichen, so daß ein die Flammen kühlender Wärmeabfluß über die Brennerplatte in das wärmeabführende Medium nur in einem begrenzten Umfang möglich ist. Das schränkt auch das Bestreben nach einer möglichst großen Flächenbelastung des Brenners ein, wenn die Flammentemperatur nicht in einen bezüglich der Nox-Bildung schädlichen Bereich ansteigen soll.In known gas burners of this type (EP 0 404 260 A1), the channels in the burner plate are formed between individual plate elements, the edges of which on the combustion chamber side all lie in a common exit plane. In this embodiment, the flame roots only touch the burner plate with their apex regions, so that a heat flow that cools the flames via the burner plate into the heat-dissipating medium is only possible to a limited extent. This also restricts the effort for the burner to have as large a surface load as possible if the flame temperature is not to rise to an area which is harmful with respect to the formation of NO x .
Aus der US 4,137,905 A ist ein Gasbrenner mit einer mit Rippen versehenen Brennerplatte bekannt, wobei die Rippen von einem Kühlrohr durchzogen sind. Der Abstand der Rippen am Kühlrohr ist dabei so gewählt, daß bei der Verbrennung die Flammen mit ihren Wurzeln auf den brennraumseitigen Randkanten der Rippen aufsitzen. Die Randkanten der Rippen liegen dabei in einer gemeinsamen Ebene.From US 4,137,905 A is a gas burner with one with ribs provided burner plate known, the ribs of a Cooling tube are pulled. The distance between the fins on the cooling pipe is chosen so that the flames with their combustion Sit the roots on the edges of the ribs on the combustion chamber side. The marginal edges of the ribs lie in a common plane.
Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Flammen in ihrem Wurzelbereich über eine definierte, sich über den Scheitelbereich hinaus erstreckende Fläche so gekühlt werden, daß auch höhere Flächenbelastungen des Brenners beziehungsweise der Brennerplatte möglich sind, ohne daß sich unzulassig hohe NOx-Werte ergeben.The arrangement according to the invention with the characterizing features of the main claim has the advantage that the flames are cooled in their root area over a defined area extending beyond the apex area so that even higher surface loads of the burner or the burner plate are possible without result in inadmissibly high NO x values.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des Gegenstandes des Hauptanspruchs möglich.By the measures listed in the subclaims advantageous developments of the subject of Main claim possible.
Eine einfache, bei Wärmetauschern in Wassererhitzern bewährte Ausführung ergibt sich, wenn die Brennerplatte aus Blechrippen aufgebaut ist, die durch ein vom wärmeableitenden Medium durchströmtes Kühlrohrsystem miteinander verbunden sind und zwischen sich die Kanäle beziehungsweise Spalte für den Durchtritt des Brennstoff-Luftgemisches begrenzen.A simple one for heat exchangers in water heaters proven design results when the burner plate is out Sheet metal ribs is built up by one of the cooling pipe system through which heat-dissipating medium flows are interconnected and the channels between them or column for the passage of the Limit fuel-air mixture.
Bei dieser bewährten Ausführung ist es besonders vorteilhaft, wenn die brennraumseitigen Ränder von bestimmten Blechrippen gegenüber den brennraumseitigen Rändern der anderen Blechrippen zurückversetzt sind. Dadurch wird eine besonders ausgeprägte Strukturierung der brennraumseitigen Wand der Brennerplatte erreicht, bei welcher die Flammenwurzeln über größere Seitenbereiche an benachbarten Blechrippen anliegen und daher besonders gut gekühlt werden.It is special with this proven design advantageous if the edges on the combustion chamber side of certain sheet metal fins compared to the combustion chamber side Edges of the other sheet metal ribs are set back. Thereby is a particularly pronounced structuring of the Wall of the burner plate on the combustion chamber side is reached which the flame roots on larger side areas adjacent sheet metal ribs and therefore particularly good be cooled.
Die ausgeprägte Strukturierung der Brennerplatte kann dadurch erreicht werden, daß jeweils zwischen zwei nicht zurückversetzten Blechrippen eine zurückversetzte beziehungsweise gekürzte Blechrippe vorgesehen wird. Bei Versuchen hat sich eine Ausführung als besonders vorteilhaft herausgestellt, bei welcher jeweils zwischen zwei nicht zurückversetzten Blechrippen zwei kürzere Blechrippen nebeneinanderliegend angeordnet sind. The distinctive structuring of the burner plate can can be achieved by not between two set back sheet metal ribs a set back or shortened sheet metal rib is provided. At An execution has proven to be particularly advantageous pointed out, in which between two not set back sheet metal ribs two shorter sheet metal ribs are arranged side by side.
Bei der Ausbildung der Kanäle in der Brennerplatte ist darauf zu achten, daß sie mindestens über einen Längsabschnitt eine Breite beziehungsweise einen Durchmesser haben, die beziehungsweise der kleiner als der sogenannte Löschabstand ist, damit die Flammen nicht zurückschlagen können. Zu diesem Zweck wird vorgeschlagen, daß an der Einströmseite der Brennerplatte ein Lochblech beziehungsweise eine Gitterstruktur vorgesehen ist, dessen Öffnungsdurchmesser beziehungsweise deren Maschenweite kleiner als der Rippenabstand ist.In the formation of the channels in the burner plate is make sure that they have at least one Longitudinal section a width or a diameter have the or the smaller than the so-called Extinguishing distance is so that the flames do not fight back can. For this purpose it is proposed that at the A perforated plate on the inflow side of the burner plate or a lattice structure is provided, the Opening diameter or their mesh size is smaller than the rib spacing.
Anstelle einer den Rippenrohrwärmetauschern von Wassererhitzern nachgebildeten Ausführung einer Brennerplatte kann diese auch aus einer mit Zuströmbohrungen versehenen, mit dem wärmeableitenden Rohrsystem verbundenen Grundplatte und einer Vielzahl von auf der Grundplatte befestigten Stiften bestehen, die zwischen sich die Kanäle für den Durchtritt des Brennstoff-Luftgemisches bilden.Instead of one of the finned tube heat exchangers from Model of a water heater model Burner plate can also be made from an inflow hole provided, connected to the heat-dissipating pipe system Base plate and a variety of on the base plate attached pins are made between the channels form for the passage of the fuel-air mixture.
Ferner kann die Brennerplatte aus einer Wabenstruktur und einer damit verbundenen Grundplatte bestehen, die mit dem wärmeableitenden Rohrsystem verbunden und mit in die Kanäle der Wabenstruktur einmündenden Zuströmbohrungen versehen ist. Zur stärkeren Strukturierung der brennraumseitigen Wand der Wabenstruktur wird vorgeschlagen, diese durch verkürzte Einsätze in den Einzelwaben gestuft auszubilden.Furthermore, the burner plate can consist of a honeycomb structure and an associated base plate exist with the heat-dissipating pipe system connected and in the channels the inflow holes opening into the honeycomb structure is. For stronger structuring of the wall on the combustion chamber side the honeycomb structure is suggested, this by shortened To train inserts in the individual honeycombs.
Der Bildung von schädlichen NOX-Emissionen kann weiter entgegengewirkt werden, wenn die Wände der Kanäle für das durchströmende Brennstoff-Luftgemisch mindestens im Bereich ihrer brennraumseitigen Endabschnitte katalytisch beschichtet sind. In diesem Fall ist die Brennerplatte durch entsprechende Bemessung beziehungsweise Werkstoffwahl so auszulegen, daß sich eine Oberflächentemperatur von ca. 600° C ergibt. Der Start eines solchen katalytischen Brenners erfolgt in konventioneller Weise mit an den Rippen- beziehungsweise Wabenenden frei brennenden Flammen. Nach Erwärmung der Brennerplatte auf die Betriebstemperatur der Katalysatorbeschichtung ziehen sich die Flammen in den katalytisch wirksamen Bereich zurück.The formation of harmful NO x emissions can be further counteracted if the walls of the channels for the fuel / air mixture flowing through are catalytically coated at least in the region of their end sections on the combustion chamber side. In this case, the burner plate must be designed by appropriate dimensioning or material selection so that the surface temperature is approximately 600 ° C. Such a catalytic burner is started in a conventional manner with flames burning freely at the fin or honeycomb ends. After the burner plate has been heated to the operating temperature of the catalyst coating, the flames withdraw into the catalytically active region.
Wenn der Gasbrenner als Heizquelle für einen Wassererhitzer bestimmt ist, kann vorteilhaft das mit der Brennerplatte wärmeleitend verbundene Rohrsystem vom aufzuheizenden Wasser durchströmt sein und das Rohrsystem mit der Brennerplatte eine Wärmetauschereinheit des Wassererhitzers bilden. In diesem Fall kann ein von den Verbrennungsgasen des Gasbrenners beaufschlagter Wärmetauscher kleiner als bei einer Ausführung mit ungekühltem Brenner ausgeführt werden.If the gas burner as a heat source for a water heater is determined, can be advantageous with the burner plate Pipe system of the water to be heated connected in a heat-conducting manner be flowed through and the pipe system with the burner plate form a heat exchanger unit of the water heater. In In this case, one of the combustion gases of the Gas burner's heat exchanger is smaller than at a version with uncooled burner.
Drei Ausführungsbeispiele sind in der Zeichnung schematisch dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Wassererhitzer mit einem Gasbrenner nach dem ersten Ausführungsbeispiel, Figur 2 vergrößert die Brennerplatte des Gasbrenners nach Figur 1 und die Figuren 3 und 4 je eine Abwandlung der Brennerplatte nach Figur 2. In den Figuren 5 und 6 sind die Brennerplatten gemäß dem zweiten und dritten Ausführungsbeispiel dargestellt. Figur 7 zeigt eine Draufsicht auf die Brennerplatte nach Figur 6.Three exemplary embodiments are schematic in the drawing shown and in the following description explained. 1 shows a water heater with a Gas burner according to the first embodiment, Figure 2 enlarges the burner plate of the gas burner according to FIG. 1 and Figures 3 and 4 each a modification of the burner plate according to Figure 2. In Figures 5 and 6 are the burner plates according to the second and third embodiments shown. Figure 7 shows a plan view of the Burner plate according to FIG. 6.
Der Wassererhitzer nach Figur 1 hat in einem Gehäuse 10
einen Gasbrenner 12, dem ein Brennstoff-Luftgemisch unter
Gebläsedruck in Richtung des Pfeiles A zugeführt ist.
Stromab des Gasbrenners 12 sitzt im Gehäuse 10 ein
Abgaswärmetauscher 14, der von einem Rohrsystem 16
durchsetzt ist, welches das zu erhitzende Wasser führt. Das
Rohrsystem 16 ist über eine Leitung 18 mit einem zweiten
Rohrsystem 20 verbunden, das in den Gasbrenner 12 integriert
ist. Stromab des Gasbrenners 12 ist eine Zündeinrichtung 22
zum Inbetriebsetzen der Heizung am Gehäuse 10 befestigt.The water heater according to FIG. 1 has a housing 10
a
Der Gasbrenner 12 hat eine Brennerplatte 24, die aus
unterschiedlich langen Blechrippen 26, 28 (Figur 2)
aufgebaut ist. Die Blechrippen 26, 28 stehen in gut
wärmeleitendem Kontakt mit dem Rohrsystem 20 und sind durch
dieses zu einer starren Baueinheit verbunden. Zwischen den
Blechrippen 26, 28 sind Spalte 30 für den Durchtritt des
Brennstoff-Luftgemisches gebildet. Die Breite a der Spalte
30 ist kleiner als der sogenannte Löschabstand bemessen, so
daß Flammen nicht in die Brennerplatte 24 beziehungsweise in
eine gegebenenfalls davorliegende Mischzone zurückschlagen
können.The
Die Brennerplatte 24 ist so gestaltet, daß die kürzeren
Blechrippen 28 jeweils zwischen zwei längeren Blechrippen 26
stehen. Dabei ist die Anordnung so getroffen, daß die
brennraumseitigen Ränder 32 der kürzeren Blechrippen 28
gegenüber den Rändern 34 der längeren Blechrippen 26
zurückgesetzt sind. Dadurch ergibt sich an der
brennraumseitigen Wand der Brennerplatte 24 eine stark
gestufte Oberflächenstrukturierung mit breiten
Zwischenräumen 36, die seitlich durch Wandbereiche 38 der
längeren Blechrippen 26 begrenzt sind.The
Nach dem Zünden des Brenners reagiert das Gemisch zwischen
beziehungsweise an den stromab liegenden Rändern 32, 34 der
Blechrippen 26, 28 unter Flammenbildung, wobei
Reaktionswärme aus den Flammenwurzeln über die Blechrippen
26, 28 an das aufzuheizende Wasser im Rohrsystem 20 gelangt.
Die Flammenwurzeln werden hierbei besonders gut gekühlt,
weil sie auch Seitenberührung mit den Wandbereichen 38 der
Blechrippen 26 haben. Die beider Reaktion an der
Brennerplatte 24 entstehenden Verbrennungsgase strömen durch
den Abgaswärmetauscher 14, wo sie Wärme an das aufzuheizende
Wasser im Rohrsystem 16 abgeben. Die abgewandelte Ausführung
nach Figur 3 ist eine Brennerplatte 40, bei welcher jeweils
zwei verkürzte Blechrippen 28 zwischen den längeren
Blechrippen 26 angeordnet sind. Dadurch ergeben sich noch
breitere Zwischenräume 42, welche die brennraumseitige Wand
der Brennerplatte 40 besonders stark strukturieren.After igniting the burner, the mixture reacts between
or at the
Bei der abgewandelten Ausführung nach Figur 4 ist eine
Brennerplatte 44 aus unterschiedlichen langen Blechrippen
46, 48 aufgebaut, die durch das kühlende Rohrsystem 20 starr
miteinander verbunden und deren brennraumseitigen
Endabschnitte katalytisch beschichtet sind. Auf der
Eingangsseite ist die Brennerplatte 44 mit einer
Gitterstruktur 50 versehen, deren Maschenweite kleiner als
die Breite der Spalte zwischen den Blechrippen 46, 48 ist.
Die Wärmeleitfähigkeit der Blechrippen 46, 48 ist durch
Bemessung und/oder Werkstoffwahl so auf die Brennerleistung
abgestimmt, daß sich ihre Oberflächentemperatur auf zum
Beispiel 600° C einstellt. An den Blechrippen 46, 48 findet
eine katalytische Verbrennung statt, bei der im Vergleich zu
einer unbeschichteten Ausführung die Bildung von
Schadstoffen noch weiter reduziert ist.In the modified embodiment according to FIG. 4 there is one
Burner
Der Start des Brenners erfolgt in konventioneller Weise mit
einer an den brennraumseitigen Enden der Blechrippen 46, 48
frei brennenden Flamme. Nach Erwärmung der Blechrippen 46,
48 auf die Betriebstemperatur der Katalysatorbeschichtung
zieht sich die Flamme in den katalytisch wirksamen Bereich
der Brennerplatte 44 zurück.The burner is started in a conventional manner
one at the ends of the
In Figur 5 ist eine Brennerplatte 52 mit ungleichlangen
Stiften 54, 56 bestückt, die zwischen sich Kanäle 58 für den
Durchtritt des Brennstoff-Luftgemisches und brennraumseitig
breitere Zwischenräume 60 für die umfassende Berührung der
Flammenwurzeln bilden. Die Stifte 54, 56 sind an einer
Grundplatte 62 befestigt, die mit engen Zuströmbohrungen 64
für das Brennstoff-Luftgemisch versehen ist und gleichzeitig.
eine wärmeleitende Verbindung zu einem Wasser führenden
Rohrsystem 66 herstellt, das sich beispielsweise
meanderförmig über die Fläche der Grundplatte 62 erstreckt.In Figure 5 is a
Das Ausführungsbeispiel nach den Figuren 6 und 7
unterscheidet sich vom vorbeschriebenen dadurch, daß eine
Brennerplatte 68 aus der mit dem Rohrsystem 66 verbundenen
Grundplatte 62 und einer daran befestigten Wabenstruktur 70
besteht. Diese ist aus sechseckigen, spaltlos aneinanderanliegenden
Einzelwaben 72 gebildet, in deren Hohlräume die
Zuströmbohrungen 64 der Grundplatte 62 einmünden. Zur
stärkeren Strukturierung der brennraumseitigen Wand der
Brennerplatte 68 können, wie in den Figuren 6 und 7 rechts
dargestellt ist, die Hohlräume der Einzelwaben 72 oder eines
Teils der Einzelwaben 72 durch an der Grundplatte 62
befestigte, vorzugsweise ebenfalls wabenförmige Einsätze 74
verengt sein, die kürzer als die Einzelwaben 72 ausgeführt
sind und eine Stufung der brennraumseitigen Wand der
Brennerplatte bewirken.The exemplary embodiment according to FIGS. 6 and 7
differs from the above in that a
Burner
Claims (9)
- Gas burner for heaters, especially water heaters, having a burner plate which is of rib-shaped design and has a multiplicity of channels for the passage of a fuel/air mixture which is supplied under fan pressure, heats up to ignition temperature at the burner plate and reacts in the region of the combustion-chamber-side orifices of the channels while forming a flame, and also having means for cooling the burner plate and limiting the flame temperature to values at which the NOx emissions of the burner do not exceed predetermined limits, characterized in that the combustion-chamber-side wall of the burner plate (24, 40, 44, 52, 68) is designed so as to be structured in a stepped manner, in that the combustion-chamber-side margins (32) of certain ribs (28, 48) of the burner plate (24, 40, 44, 52, 68) are set back relative to the combustion-chamber-side margins (34) of the other ribs (26, 46) of the burner plate (24, 40, 44, 52, 68), and in that defined contact surfaces (38) are obtained between the flame roots in contact with the burner plate and the orifice margins (32, 34) of the channels (30, 58), which contact surfaces (38) extend beyond the apex regions of the flame roots also towards or into their side regions.
- Gas burner according to Claim 1, characterized in that two shorter ribs (28, 48) are arranged side by side in each case between two ribs (26, 46) which are not set back.
- Gas burner according to Claim 1 or 2, characterized in that the burner plate (24, 40, 44) is composed of sheet-metal ribs (26, 28, 46, 48) which are connected to one another by a cooling-pipe system (20) through which the heat-dissipating medium flows and define between them the channels or gaps (30) for the passage of the fuel/air mixture.
- Gas burner according to one of the preceding claims, characterized in that a grid structure or perforated plate (50, 62), the mesh width of which or the opening diameter of which is smaller than the rib spacing, is provided on the inflow side of the burner plate (44, 52, 68).
- Gas burner according to Claim 1, characterized in that the burner plate (52) consists of a base plate (62), provided with inflow bores (64) and connected to the heat-dissipating pipe system (66), and of a multiplicity of pins (54, 56) which form between them the channels (58) for the passage of the fuel/air mixture.
- Gas burner according to Claim 1, characterized in that the burner plate (68) consists of a honeycomb structure (70) and a base plate (62) which is connected to the honeycomb structure (70) and to the heat-dissipating pipe system (66) and is provided with inflow bores (64) opening into the channels of the honeycomb structure (70).
- Gas burner according to Claim 6, characterized in that the combustion-chamber-side wall of the honeycomb structure (70) is designed to be stepped by means of shortened inserts (74) in its individual honeycomb cells (72).
- Gas burner according to one of the preceding claims, characterized in that the walls of the channels for the fuel/air mixture flowing through are catalytically coated at least in the region of their combustion-chamber-side end sections.
- Gas burner according to one of the preceding claims, characterized in that water to be heated up flows as heat-dissipating medium through the pipe system (20, 66), which is connected in a heat-conducting manner to the burner plate (24, 40, 44, 52, 68) and forms with the latter a heat-exchanger unit for a water heater.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4445460 | 1994-12-20 | ||
| DE4445460A DE4445460A1 (en) | 1994-12-20 | 1994-12-20 | Gas burners for heating devices, in particular water heaters |
| PCT/DE1995/001663 WO1996019698A1 (en) | 1994-12-20 | 1995-11-24 | Gas burner for heaters,especially water heaters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0796412A1 EP0796412A1 (en) | 1997-09-24 |
| EP0796412B1 true EP0796412B1 (en) | 2001-06-20 |
Family
ID=6536379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95936980A Expired - Lifetime EP0796412B1 (en) | 1994-12-20 | 1995-11-24 | Gas burner for heaters,especially water heaters |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0796412B1 (en) |
| JP (1) | JPH10510912A (en) |
| KR (1) | KR980700540A (en) |
| CN (1) | CN1171150A (en) |
| CZ (1) | CZ189897A3 (en) |
| DE (2) | DE4445460A1 (en) |
| RU (1) | RU2150637C1 (en) |
| WO (1) | WO1996019698A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29611338U1 (en) * | 1996-06-18 | 1997-10-16 | Bosch Gmbh Robert | Gas burners for heating devices |
| DE19641040A1 (en) * | 1996-10-04 | 1998-04-23 | Bosch Gmbh Robert | Atmospheric gas burner |
| DE19718885C2 (en) * | 1997-05-03 | 2003-10-09 | Bosch Gmbh Robert | gas burner |
| DE19722863A1 (en) * | 1997-05-31 | 1998-12-03 | Bosch Gmbh Robert | Gas burners for heating devices, in particular water heaters |
| DE10213132B4 (en) * | 2002-03-23 | 2005-06-02 | Robert Bosch Gmbh | gas burner |
| US9976740B2 (en) * | 2012-06-12 | 2018-05-22 | Board of Regents of the Nevada Systems of Higher Educations, on Behalf of the University of Nevada, Reno | Burner |
| KR101359551B1 (en) * | 2012-08-16 | 2014-02-12 | 주식회사 경동나비엔 | Premixed burner having cooling apparatus |
| WO2017003765A1 (en) * | 2015-06-30 | 2017-01-05 | Uop Llc | Film temperature optimizer for fired process heaters |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4137905A (en) * | 1972-04-17 | 1979-02-06 | T. I. Domestic Appliances Limited | Gaseous fuel burners |
| IT1205556B (en) * | 1986-08-29 | 1989-03-23 | Polidoro Aldo | GAS BURNER HEAD OBTAINED BY A PUNCHED SHEET |
| GB2223838B (en) * | 1988-09-22 | 1992-07-22 | Padley Dr Peter Joseph | Boiler system |
| NL8901559A (en) * | 1989-06-21 | 1991-01-16 | Nefit Nv | HEATING DEVICE. |
| AT396017B (en) * | 1990-08-01 | 1993-05-25 | Vaillant Gmbh | BURNER |
| NL9200282A (en) * | 1991-12-16 | 1993-07-16 | Dejatech Bv | BURNER, WHETHER OR NOT INTEGRATED IN A HEAT EXCHANGER. |
| FR2714151B1 (en) * | 1993-12-22 | 1996-02-02 | Gaz De France | Device for hooking flames and heat exchange, burner and fluid heater thus equipped. |
-
1994
- 1994-12-20 DE DE4445460A patent/DE4445460A1/en not_active Ceased
-
1995
- 1995-11-24 EP EP95936980A patent/EP0796412B1/en not_active Expired - Lifetime
- 1995-11-24 JP JP8519407A patent/JPH10510912A/en active Pending
- 1995-11-24 RU RU97112464/06A patent/RU2150637C1/en active
- 1995-11-24 CN CN95196975A patent/CN1171150A/en active Pending
- 1995-11-24 DE DE59509357T patent/DE59509357D1/en not_active Expired - Fee Related
- 1995-11-24 WO PCT/DE1995/001663 patent/WO1996019698A1/en active IP Right Grant
- 1995-11-24 CZ CZ971898A patent/CZ189897A3/en unknown
- 1995-11-24 KR KR1019970704116A patent/KR980700540A/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| EP0796412A1 (en) | 1997-09-24 |
| DE4445460A1 (en) | 1996-06-27 |
| DE59509357D1 (en) | 2001-07-26 |
| JPH10510912A (en) | 1998-10-20 |
| WO1996019698A1 (en) | 1996-06-27 |
| KR980700540A (en) | 1998-03-30 |
| CN1171150A (en) | 1998-01-21 |
| CZ189897A3 (en) | 1997-10-15 |
| RU2150637C1 (en) | 2000-06-10 |
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