EP1933101A2 - Heat exchanger with combustion chamber - Google Patents

Heat exchanger with combustion chamber Download PDF

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Publication number
EP1933101A2
EP1933101A2 EP07023308A EP07023308A EP1933101A2 EP 1933101 A2 EP1933101 A2 EP 1933101A2 EP 07023308 A EP07023308 A EP 07023308A EP 07023308 A EP07023308 A EP 07023308A EP 1933101 A2 EP1933101 A2 EP 1933101A2
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EP
European Patent Office
Prior art keywords
combustion chamber
heat exchanger
plates
water
channel
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.)
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Application number
EP07023308A
Other languages
German (de)
French (fr)
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EP1933101A3 (en
Inventor
Martin Kolbe
Joachim Schult
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Vaillant GmbH
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Vaillant GmbH
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Filing date
Publication date
Priority claimed from AT2182007A external-priority patent/AT504771B1/en
Application filed by Vaillant GmbH filed Critical Vaillant GmbH
Publication of EP1933101A2 publication Critical patent/EP1933101A2/en
Publication of EP1933101A3 publication Critical patent/EP1933101A3/en
Withdrawn legal-status Critical Current

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    • 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
    • F24H1/44—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with combinations of two or more of the types covered by groups F24H1/24 - F24H1/40 , e.g. boilers having a combination of features covered by F24H1/24 - F24H1/40
    • 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
    • F24H1/24—Water 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
    • 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
    • F24H1/24—Water 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
    • F24H1/26—Water 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
    • 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
    • F24H1/24—Water 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
    • F24H1/26—Water 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
    • F24H1/28—Water 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
    • F24H1/287—Water 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 in line with the combustion chamber
    • 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
    • F24H1/24—Water 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
    • F24H1/30—Water 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 being built up from sections
    • 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
    • F24H1/24—Water 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
    • F24H1/30—Water 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 being built up from sections
    • F24H1/32—Water 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 being built up from sections with vertical sections arranged side by side
    • 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
    • F24H1/34—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water chamber arranged adjacent to the combustion chamber or chambers, e.g. above or at side
    • 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
    • F24H1/34—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water chamber arranged adjacent to the combustion chamber or chambers, e.g. above or at side
    • F24H1/36—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water chamber arranged adjacent to the combustion chamber or chambers, e.g. above or at side the water chamber including one or more fire tubes

Definitions

  • the invention relates to a heat exchanger with combustion chamber for a fuel-fired heater.
  • the exhaust gases of a burner are cooled in a heat exchanger and transfer the heat transferred to a water cycle for service water or space heating.
  • Such heat exchangers are usually cast iron, finned tube or fin tube heat exchangers.
  • heat exchangers in which the heating water flows through assembled metal plates. From the DE 10 2005 033 050 A1 a heat exchanger with combustion chamber for a fuel-fired heater is known in which two metal plates form water channels and the hot exhaust gases of the burner flow through several gaps between the parallel water channels.
  • the present invention has for its object to provide a heat exchanger with combustion chamber for a fuel-fired heater, which is characterized by a simple, but efficient structure.
  • the object of the invention according to the features of claim 1 is achieved in that from two plates, a water channel is formed and two water channels are arranged such that they form both the combustion chamber and a Schugaskanal combined. While the water channels are arranged on the side of the combustion chamber relatively far apart, so that a burner can be accommodated, the distance of the water channels to the other side tapers, so that on the side facing away from the combustion chamber only a thin heating gas channel forms a narrow channel.
  • parts of the plates may be at least partially ribbed.
  • a ribbing increases the heat transfer surface area and also gives the component more rigidity.
  • the plates are bent in such a half-shell-like manner that the water channels adjacent to one another form a channel. It when the two water channels, which are formed by the plates are constructed mirror images, so that in each case for a heat exchanger two identical outer plates and two identical inner plates can be used is particularly advantageous.
  • both two plates can be welded as a water channel, as well as two water channels to the heat exchanger with combustion chamber. It is optionally possible to connect all 4 plates together in one welding process.
  • the heat exchanger is connected to a heater such that the return of the heater to the side of the Schugaskanals and the flow are connected to the side of the combustion chamber.
  • FIG. 1 shows a heat exchanger 1, which consists of plates 3. How out FIG. 2 it can be seen, two plates 3 each form a water channel 6. Two water channels 6 are so assembled into a heat exchanger 1 that on one side the plates 3 protrude far apart and thus form a combustion chamber 2. On the side facing away from the combustion chamber 2 side, the distance between the two water channels 6 tapers and form a Walkergaskanal 4. This Bankgaskanal 4 tapers again from the side of the combustion chamber 2 to the combustion chamber 2 side facing away. On the side of the Russellgaskanals 4 is located in an outer plate 3 of a water channel 6, a return inlet 7. This is connected during installation of the heat exchanger 1 in a heater with the return.
  • FIG. 3 shows the frontal view of the previously described heat exchanger 1. Here, it can be seen that in the region of the combustion chamber 2 of the heat exchanger 1, the plates 3 have a ribbing.
  • the plates 3 are bent like a half shell, so that the two water channels 6 can be joined together to form a channel for the heating gases. At the edge on which the plates 3 abut each other, they are connected by a weld 5.
  • an inner plate 3 and an outer plate 2 can first be connected to one another so that they form a water channel 6. Two such water channels 6 can then be assembled and connected so that they form an exhaust-carrying channel.
  • the heat exchanger 1 with combustion chamber 2 is preferably installed in a fuel-fired heater such that the combustion chamber 2 above and the heating gas 4 are located below.
  • a fuel-operated burner is used in the opening of the combustion chamber 2.
  • an exhaust discharge is connected at the lower end of the Schuchkanals 4 .
  • a condensate drain in this area, which by suitable measures, for. B a siphon, ensures that no exhaust gas leak can.
  • the return port 7 of the heat exchanger 1 is connected to the return line of the heater, the flow connection 8 with the flow of the heater.
  • a fuel in the combustion chamber 2 of the heat exchanger 1 is burned by means of a burner. Radiant heat is absorbed by the inner plates 3 of the water channels 6.
  • the hot exhaust gases of the burner flow down through the combustion chamber 2 and then flow into the heating gas channel 4.
  • the exhaust gases heat to the water channels 6, which are flowed through from bottom to top, ie in countercurrent from. This ensures that the exhaust gases - at least theoretically - can be cooled down to the return temperature. This allows the dew point of the exhaust to fall below, whereby condensation heat can be obtained.
  • Both water channels 6 can be flowed through from bottom to top; However, it is also possible to flow through a water channel 6 from bottom to top and the other from top to bottom, in the latter case, the efficiency of the heat exchanger 1 is lower.
  • the outer and inner plate 3 of a water channel 6 are coordinated so that they form a flow-optimized water channel 6, in which it comes as possible to no dead water areas, otherwise it could come here to blistering, which can lead to material damage.
  • a corresponding ribbing not only increases the heat transfer, but also ensures the necessary rigidity of the heat exchanger. 1
  • the wall in which the flow connection 8 is located and the wall opposite this wall referred to As sidewalls, the wall in which the flow connection 8 is located and the wall opposite this wall referred to. Although it is possible in principle not to penetrate the side walls of water, but cooled side walls lead to an increase in efficiency and a simultaneous reduction of radiation losses.
  • the design described here, in which half-shell-like plates are assembled, also has the advantage that few components are necessary.
  • the heating gas channel does not necessarily have to be arranged centrally. It is conceivable that only one water channel is half-shell-shaped, while the other water channel represents only a flat plate. It is also conceivable that the heating gas channel is not arranged perpendicular to the burner, but rather at an angle thereto. This has the advantage that no radiation can escape through the heating gas channel.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The combined heat exchanger and combustion chamber (2) for heating systems is made from sheet metal (3) and is double-walled. The walls enclose a water channel (6) and are shaped to form a fuel gas channel (4) at the base.

Description

Die Erfindung bezieht sich auf einen Wärmetauscher mit Brennkammer für ein brennstoffbeheiztes Heizgerät.The invention relates to a heat exchanger with combustion chamber for a fuel-fired heater.

Bei brennstoffbeheizten Heizgeräten werden die Abgase eines Brenners in einem Wärmetauscher abgekühlt und die dabei übertragene Wärme auf einen Wasserkreislauf für Brauchwasser oder Raumheizung übertragen.In fuel-fired heaters, the exhaust gases of a burner are cooled in a heat exchanger and transfer the heat transferred to a water cycle for service water or space heating.

Derartige Wärmetauscher sind zumeist Guss-, Rippenrohr- oder Lamellenrohrwärmetauscher. Es sind Wärmetauscher bekannt, bei denen das Heizwasser durch zusammengefügte Blechplatten strömt. Aus der DE 10 2005 033 050 A1 ist ein Wärmetauscher mit Brennkammer für ein brennstoffbeheiztes Heizgerät bekannt, bei dem je zwei Blechplatten Wasserkanäle bilden und die heißen Abgase des Brenners durch mehrere Spalte zwischen den parallel angeordneten Wasserkanälen strömen.Such heat exchangers are usually cast iron, finned tube or fin tube heat exchangers. There are known heat exchangers in which the heating water flows through assembled metal plates. From the DE 10 2005 033 050 A1 a heat exchanger with combustion chamber for a fuel-fired heater is known in which two metal plates form water channels and the hot exhaust gases of the burner flow through several gaps between the parallel water channels.

Bei aus Blechplatten gefertigten Wärmetauschern besteht das Problem, dass diese zumeist aus sehr vielen Teilen bestehen und somit der Fertigungsaufwand vergleichsweise groß ist.When manufactured from sheet metal plates heat exchangers, the problem is that they usually consist of very many parts and thus the manufacturing cost is relatively large.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Wärmetauscher mit Brennkammer für ein brennstoffbeheiztes Heizgerät zu schaffen, welcher sich durch einen einfachen, jedoch effizienten Aufbau auszeichnet.The present invention has for its object to provide a heat exchanger with combustion chamber for a fuel-fired heater, which is characterized by a simple, but efficient structure.

Erfindungsgemäß wird die Aufgabe der Erfindung gemäß den Merkmalen des Anspruchs 1 dadurch gelöst, dass aus jeweils zwei Platten ein Wasserkanal gebildet wird und zwei Wasserkanäle derart angeordnet werden, dass sie zusammengesetzt sowohl die Brennkammer als auch einen Heizgaskanal bilden. Während die Wasserkanäle auf der Seite der Brennkammer relativ weit auseinander angeordnet sind, so dass ein Brenner aufgenommen werden kann, verjüngt sich der Abstand der Wasserkanäle zur anderen Seite, so dass an der der Brennkammer abgewandten Seite nur noch ein dünner Heizgaskanal einen schmalen Kanal bildet.According to the invention the object of the invention according to the features of claim 1 is achieved in that from two plates, a water channel is formed and two water channels are arranged such that they form both the combustion chamber and a Heizgaskanal combined. While the water channels are arranged on the side of the combustion chamber relatively far apart, so that a burner can be accommodated, the distance of the water channels to the other side tapers, so that on the side facing away from the combustion chamber only a thin heating gas channel forms a narrow channel.

Die Unteransprüche schützen vorteilhafte Details der Erfindung.The subclaims protect advantageous details of the invention.

So können gemäß den Merkmalen des Anspruchs 2 Teile der Platten zumindest teilweise berippt sein. Eine Berippung sorgt für eine Vergrößerung der Wärmeübertragungsoberfläche und gibt zudem dem Bauteil mehr Steifigkeit.Thus, according to the features of claim 2 parts of the plates may be at least partially ribbed. A ribbing increases the heat transfer surface area and also gives the component more rigidity.

Gemäß den Merkmalen des abhängigen Anspruchs 3 sind die Platten derartig halbschalenartig gebogen, dass die Wasserkanäle aneinander anliegend einen Kanal bilden. Besonders vorteilhaft ist es, wenn die beiden Wasserkanäle, welche durch die Platten gebildet werden, spiegelbildlich aufgebaut sind, so dass jeweils für einen Wärmetauscher zwei baugleiche Außenplatten und zwei baugleiche Innenplatten verwendet werden können.According to the features of dependent claim 3, the plates are bent in such a half-shell-like manner that the water channels adjacent to one another form a channel. It when the two water channels, which are formed by the plates are constructed mirror images, so that in each case for a heat exchanger two identical outer plates and two identical inner plates can be used is particularly advantageous.

Gemäß den Merkmalen des Anspruchs 4 können sowohl je zwei Platten als Wasserkanal, als auch zwei Wasserkanäle zum Wärmetauscher mit Brennkammer verschweißt werden. Es ist optional möglich, alle 4 Platten in einem Schweißvorgang miteinander zu verbinden.According to the features of claim 4, both two plates can be welded as a water channel, as well as two water channels to the heat exchanger with combustion chamber. It is optionally possible to connect all 4 plates together in one welding process.

Gemäß den Merkmalen des abhängigen Anspruchs 5 verjüngt sich der Heizgaskanal zu der der Brennkammer abgewandten Seite. Dies begünstigt den Wärmeübergang.According to the features of the dependent claim 5, the Heizgaskanal tapers to the combustion chamber side facing away from. This favors the heat transfer.

Gemäß den Merkmalen des Anspruchs 6 wird der Wärmetauscher derartig mit einem Heizgerät verbunden, dass der Rücklauf des Heizgerätes mit der Seite des Heizgaskanals und der Vorlauf mit der Seite der Brennkammer verbunden werden.According to the features of claim 6, the heat exchanger is connected to a heater such that the return of the heater to the side of the Heizgaskanals and the flow are connected to the side of the combustion chamber.

Die Erfindung wird nun anhand der Figuren detailliert erläutert. Hierbei zeigtThe invention will now be explained in detail with reference to FIGS. This shows

  • Figur 1 einen kombinierten Wärmetauscher mit Brennkammer für ein brennstoffbeheiztes Heizgerät in der perspektivischen Ansicht, FIG. 1 a combined heat exchanger with combustion chamber for a fuel-fired heater in the perspective view,
  • Figur 2 einen Schnitt hierdurch und FIG. 2 a cut through it and
  • Figur 3 eine Frontalansicht. FIG. 3 a frontal view.

Figur 1 zeigt einen Wärmetauscher 1, welcher aus Platten 3 besteht. Wie aus Figur 2 ersichtlich, bilden jeweils zwei Platten 3 einen Wasserkanal 6. Zwei Wasserkanäle 6 werden derartig zu einem Wärmetauscher 1 zusammengesetzt, dass auf der einen Seite die Platten 3 weit auseinander ragen und somit eine Brennkammer 2 bilden. Auf der der Brennkammer 2 abgewandten Seite verjüngt sich der Abstand der zwei Wasserkanäle 6 und bilden einen Heizgaskanal 4. Dieser Heizgaskanal 4 verjüngt sich wiederum von der Seite der Brennkammer 2 zu der der Brennkammer 2 abgewandten Seite. Auf der Seite des Heizgaskanals 4 befindet sich in einer äußeren Platte 3 eines Wasserkanals 6 ein Rücklaufeintritt 7. Dieser wird beim Einbau des Wärmetauschers 1 in ein Heizgerät mit dem Rücklauf verbunden. Auf der Seite der Brennkammer 2 des Wärmetauschers 1 befindet sich ein Vorlaufanschluss 8, welcher beim Einbau in das Gerät mit dem Vorlauf des Heizgerätes verbunden wird. Figur 3 zeigt die Frontalansicht auf den vorher beschriebenen Wärmetauscher 1. Hierbei ist zu sehen, dass im Bereich der Brennkammer 2 des Wärmeaustauschers 1 die Platten 3 über eine Berippung verfügen. FIG. 1 shows a heat exchanger 1, which consists of plates 3. How out FIG. 2 it can be seen, two plates 3 each form a water channel 6. Two water channels 6 are so assembled into a heat exchanger 1 that on one side the plates 3 protrude far apart and thus form a combustion chamber 2. On the side facing away from the combustion chamber 2 side, the distance between the two water channels 6 tapers and form a Heizgaskanal 4. This Heizgaskanal 4 tapers again from the side of the combustion chamber 2 to the combustion chamber 2 side facing away. On the side of the Heizgaskanals 4 is located in an outer plate 3 of a water channel 6, a return inlet 7. This is connected during installation of the heat exchanger 1 in a heater with the return. On the side of the combustion chamber 2 of the heat exchanger 1 is a flow connection 8, which is connected when installed in the device with the flow of the heater. FIG. 3 shows the frontal view of the previously described heat exchanger 1. Here, it can be seen that in the region of the combustion chamber 2 of the heat exchanger 1, the plates 3 have a ribbing.

Die Platten 3 sind halbschalenartig gebogen, sodass die zwei Wasserkanäle 6 zu einem Kanal für die Heizgase zusammengefügt werden können. An der Kante, an welcher die Platten 3 miteinander anliegen, werden sie durch eine Schweißnaht 5 verbunden.The plates 3 are bent like a half shell, so that the two water channels 6 can be joined together to form a channel for the heating gases. At the edge on which the plates 3 abut each other, they are connected by a weld 5.

Zur Herstellung eines derartigen Wärmetauschers 1 können einerseits eine Innenplatte 3 und eine Außenplatte 2 zunächst miteinander verbunden werden, so dass sie einen Wasserkanal 6 bilden. Zwei derartige Wasserkanäle 6 können sodann zusammengesetzt und verbunden werden, so dass sie einen abgasführenden Kanal bilden.To produce such a heat exchanger 1, on the one hand, an inner plate 3 and an outer plate 2 can first be connected to one another so that they form a water channel 6. Two such water channels 6 can then be assembled and connected so that they form an exhaust-carrying channel.

Es besteht auch die Möglichkeit, dass vier Platten 3 unmittelbar miteinander verbunden werden und an den Kanten, an denen sie zusammenstoßen, eine Schweißnaht 5 aufgebracht wird.There is also the possibility that four plates 3 are directly connected to each other and at the edges where they collide, a weld 5 is applied.

Der Wärmetauscher 1 mit Brennkammer 2 wird in einem brennstoffbeheizten Heizgerät vorzugsweise derart eingebaut, dass die Brennkammer 2 oben und der Heizgaskanal 4 sich darunter befinden. In die Öffnung der Brennkammer 2 wird ein brennstoffbetriebener Brenner eingesetzt. An das untere Ende des Heizgaskanals 4 wird eine Abgasabführung angeschlossen. Zugleich befindet sich in diesem Bereich ein Kondensatablauf, welcher durch geeignete Maßnahmen, z. B einen Siphon, dafür sorgt, dass kein Abgas austreten kann. Der Rücklaufanschluss 7 des Wärmetauschers 1 wird mit der Rücklaufleitung des Heizgerätes verbunden, der Vorlaufanschluss 8 mit dem Vorlauf des Heizgerätes.The heat exchanger 1 with combustion chamber 2 is preferably installed in a fuel-fired heater such that the combustion chamber 2 above and the heating gas 4 are located below. In the opening of the combustion chamber 2, a fuel-operated burner is used. At the lower end of the Heizgaskanals 4 an exhaust discharge is connected. At the same time there is a condensate drain in this area, which by suitable measures, for. B a siphon, ensures that no exhaust gas leak can. The return port 7 of the heat exchanger 1 is connected to the return line of the heater, the flow connection 8 with the flow of the heater.

Beim Betrieb des Heizgerätes wird mittels eines Brenners ein Brennstoff in der Brennkammer 2 des Wärmetauschers 1 verbrannt. Strahlungswärme wird von den inneren Platten 3 der Wasserkanäle 6 aufgenommen. Die heißen Abgase des Brenners strömen durch die Brennkammer 2 nach unten und strömen dann in den Heizgaskanal 4 ein. Hierbei geben die Abgase Wärme an die Wasserkanäle 6, welche von unten nach oben, also im Gegenstrom durchströmt werden, ab. Hierdurch wird erreicht, dass die Abgase - zumindest theoretisch - bis auf Rücklauftemperatur abgekühlt werden können. Dies ermöglicht den Taupunkt der Abgas zu unterschreiten, wodurch Kondensationswärme gewonnen werden kann.During operation of the heater, a fuel in the combustion chamber 2 of the heat exchanger 1 is burned by means of a burner. Radiant heat is absorbed by the inner plates 3 of the water channels 6. The hot exhaust gases of the burner flow down through the combustion chamber 2 and then flow into the heating gas channel 4. Here, the exhaust gases heat to the water channels 6, which are flowed through from bottom to top, ie in countercurrent from. This ensures that the exhaust gases - at least theoretically - can be cooled down to the return temperature. This allows the dew point of the exhaust to fall below, whereby condensation heat can be obtained.

Es können beide Wasserkanäle 6 von unten nach oben durchströmt werden; es ist jedoch auch möglich, einen Wasserkanal 6 von unten nach oben und den anderen von oben nach unten zu durchströmen, wobei im letztgenannten Fall der Wirkungsgrad des Wärmeaustauschers 1 geringer ist.Both water channels 6 can be flowed through from bottom to top; However, it is also possible to flow through a water channel 6 from bottom to top and the other from top to bottom, in the latter case, the efficiency of the heat exchanger 1 is lower.

Da die Dichte des Abgases bei fallender Temperatur zunimmt, ist es vorteilhaft, den Heizgaskanal 4 in Strömungsrichtung zu verjüngen. Hierdurch wird auch der Wärmeaustausch begünstigt, da die Strömungsgeschwindigkeit zunimmt.Since the density of the exhaust gas increases with decreasing temperature, it is advantageous to taper the Heizgaskanal 4 in the flow direction. As a result, the heat exchange is favored, since the flow rate increases.

Die äußere und innere Platte 3 eines Wasserkanals 6 sind derart aufeinander abgestimmt, dass sie einen strömungsoptimierten Wasserkanal 6 bilden, in welchem es möglichst zu keinen Totwassergebieten kommt, da es sonst hier zu einer Blasenbildung kommen könnte, was zu Materialbeschädigungen führen kann. Eine entsprechende Verrippung erhöht nicht nur den Wärmeübergang, sondern sorgt auch für die notwendige Steifigkeit des Wärmetauschers 1.The outer and inner plate 3 of a water channel 6 are coordinated so that they form a flow-optimized water channel 6, in which it comes as possible to no dead water areas, otherwise it could come here to blistering, which can lead to material damage. A corresponding ribbing not only increases the heat transfer, but also ensures the necessary rigidity of the heat exchanger. 1

Als Seitenwände werden die Wand, in der sich der Vorlaufanschluss 8 befindet und die dieser Wand gegenüberliegende Wand bezeichnet. Es ist prinzipiell zwar möglich, die Seitenwände nicht von Wasser zu durchfluten, doch führen gekühlte Seitenwände zu einer Erhöhung des Wirkungsgrades und einer gleichzeitigen Verminderung der Strahlungsverluste. Die hier beschriebene Bauform, bei welcher halbschalenartige Platten zusammengesetzt werden, hat zudem den Vorteil, dass wenige Bauteile notwendig sind. Der Heizgaskanal muss nicht zwingenderweise mittig angeordnet sein. Es ist denkbar, dass lediglich ein Wasserkanal halbschalenartig geformt ist, während der andere Wasserkanal lediglich eine ebene Platte darstellt. Auch ist denkbar, dass der Heizgaskanal nicht senkrecht zum Brenner angeordnet ist, sondern vielmehr in einem Winkel hierzu. Dies hat zum Vorteil, dass keine Strahlung durch den Heizgaskanal entweichen kann.As sidewalls, the wall in which the flow connection 8 is located and the wall opposite this wall referred to. Although it is possible in principle not to penetrate the side walls of water, but cooled side walls lead to an increase in efficiency and a simultaneous reduction of radiation losses. The design described here, in which half-shell-like plates are assembled, also has the advantage that few components are necessary. The heating gas channel does not necessarily have to be arranged centrally. It is conceivable that only one water channel is half-shell-shaped, while the other water channel represents only a flat plate. It is also conceivable that the heating gas channel is not arranged perpendicular to the burner, but rather at an angle thereto. This has the advantage that no radiation can escape through the heating gas channel.

Claims (6)

Wärmetauscher (1) mit Brennkammer (2) für ein brennstoffbeheiztes Heizgerät, wobei der Wärmetauscher (1) und die Brennkammer (2) aus Platten (3) hergestellt sind und jeweils zwei Platten (3) einen Wasserkanal (6) bilden, dadurch gekennzeichnet, dass zwei Wasserkanäle (6) derart näherungsweise spiegelbildlich angeordnet sind, dass auf einer Seite die Wasserkanäle (6) derart weit auseinander angeordnet sind, dass sie die Brennkammer (2) bilden und sich der Abstand der beiden Wasserkanäle (6) zur anderen Seite derart verjüngt, dass die beiden Wasserkanäle (6) einen Heizgaskanal (4) bilden.Heat exchanger (1) with combustion chamber (2) for a fuel-fired heater, wherein the heat exchanger (1) and the combustion chamber (2) are made of plates (3) and two plates (3) each form a water channel (6), characterized that two water channels (6) are arranged approximately in mirror image, that on one side of the water channels (6) are arranged so far apart that they form the combustion chamber (2) and the distance between the two water channels (6) to the other side so tapers in that the two water channels (6) form a heating gas channel (4). Wärmetauscher (1) mit Brennkammer (2) nach Anspruch 1, dadurch gekennzeichnet, dass zumindest ein Teil der Platten (3) zumindest teilweise berippt ist.Heat exchanger (1) with combustion chamber (2) according to claim 1, characterized in that at least part of the plates (3) is at least partially finned. Wärmetauscher (1) mit Brennkammer (2) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Platten (3) derart halbschalenartig gebogen sind, dass die Wasserkanäle (6) einen Kanal bildend aneinander anliegen.Heat exchanger (1) with combustion chamber (2) according to claim 1 or 2, characterized in that the plates (3) are bent in such a half-shell-like manner that the water channels (6) forming a channel abut each other. Wärmetauscher (1) mit Brennkammer (2) nach einem der Ansprüche 1 bis 3 , dadurch gekennzeichnet, dass die Platten (3) miteinander verschweißt werden.Heat exchanger (1) with combustion chamber (2) according to one of claims 1 to 3, characterized in that the plates (3) are welded together. Wärmetauscher (1) mit Brennkammer (2) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Heizgaskanal (4) sich zur der Brennkammer (2) abgewandten Seite hin verjüngt.Heat exchanger (1) with combustion chamber (2) according to one of claims 1 to 4, characterized in that the heating gas channel (4) tapers towards the combustion chamber (2) facing away from side. Wärmetauscher (1) mit Brennkammer (2) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass zumindest ein Wasserkanal (6) derart mit dem Heizgerät verbunden wird, dass er auf der Seite des Heizgaskanals (4) mit dem Rücklauf und auf der Seite der Brennkammer (2) mit dem Vorlauf verbunden wird.Heat exchanger (1) with combustion chamber (2) according to one of claims 1 to 4, characterized in that at least one water channel (6) is connected to the heater such that it on the side of the Heizgaskanals (4) with the return and on the Side of the combustion chamber (2) is connected to the flow.
EP07023308A 2006-12-08 2007-12-01 Heat exchanger with combustion chamber Withdrawn EP1933101A3 (en)

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DE102006058278 2006-12-08
AT2182007A AT504771B1 (en) 2007-02-12 2007-02-12 HEAT EXCHANGER WITH FIRE CHAMBER FOR A FUEL-HEATED HEATER

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CN107270526A (en) * 2017-07-31 2017-10-20 周延明 Board-like gas water-heating furnace

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US4846149A (en) 1988-01-27 1989-07-11 Chato John D Fluid heater using pulsating combustion
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107270526A (en) * 2017-07-31 2017-10-20 周延明 Board-like gas water-heating furnace

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