EP0272660B1 - Atmospheric gas heating appliance with an external exhaust gas recycling - Google Patents

Atmospheric gas heating appliance with an external exhaust gas recycling Download PDF

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Publication number
EP0272660B1
EP0272660B1 EP87118903A EP87118903A EP0272660B1 EP 0272660 B1 EP0272660 B1 EP 0272660B1 EP 87118903 A EP87118903 A EP 87118903A EP 87118903 A EP87118903 A EP 87118903A EP 0272660 B1 EP0272660 B1 EP 0272660B1
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EP
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Prior art keywords
exhaust
atmospheric gas
gas heating
fact
lines
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EP87118903A
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German (de)
French (fr)
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EP0272660B2 (en
EP0272660A3 (en
EP0272660A2 (en
Inventor
Walter Dipl.-Ing. Dreizler
Ulrich Dipl.-Ing. Dreizler
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Dreizler Walter
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Dreizler Walter
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/002—Stoves
    • F24C3/004—Stoves of the closed type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/001—Details arrangements for discharging combustion gases
    • F24C15/002—Details arrangements for discharging combustion gases for stoves of the closed type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/30—Premixing fluegas with combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/03007—Sealed combustion chambers with balanced flue
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2211/00—Flue gas duct systems
    • F23J2211/10—Balanced flues (combining air supply and flue gas exhaust)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2211/00—Flue gas duct systems
    • F23J2211/10—Balanced flues (combining air supply and flue gas exhaust)
    • F23J2211/101—Balanced flues (combining air supply and flue gas exhaust) with coaxial duct arrangement

Definitions

  • the invention serves to reduce NO x in gas heaters that are equipped with atmospheric gas burners and have a central, ie common combustion air supply and exhaust gas discharge line.
  • a new type of exhaust gas recirculation is used which enables the exhaust gas recirculation of a partial exhaust gas quantity back to the atmospheric gas burner without additional conveying devices and thus brings about a sufficient reduction in the NO x content in the exhaust gases under previously unknown economic conditions.
  • Atmospheric gas heaters which, as so-called “outer wall units", are connected to the outside atmosphere with their combustion air line and exhaust line through the outer wall. Pipes and combustion chamber are hermetically sealed against the room to be heated. Due to the self-boosting of the exhaust gases in the combustion chamber, this system, which only opens to the atmosphere, is driven. To extend combustion air and exhaust pipes to the outside and e.g. To allow leading over the roof, such atmospheric gas heaters are also additionally equipped with a conveying fan, which is arranged either in the combustion air flow or in the exhaust gas flow.
  • the inventive solution in the subject matter of the invention enables a return of an exhaust gas partial quantity taking place outside the combustion chamber from the exhaust pipe directly into the adjacent air pipe either lying next to it or centrally outside.
  • the exhaust gas partial quantity in the exhaust pipe is transferred in the simplest manner from the exhaust pipe into the air pipe via one or more defined openings at a set and / or adjustable differential pressure, from where it goes directly to the atmospheric gas burner and its combustion chamber and there the NO x - Reduction causes.
  • the partial exhaust gas quantity reaches the same ratio as the combustion air quantity both in the primary air premix and in the secondary air area of the atmospheric gas burner.
  • the present invention is explained on the basis of exemplary embodiments.
  • the described embodiments differ mainly in that the exhaust gas-transporting and at the same time the air-sucking fan is attached once in the air duct and once in the exhaust gas path, otherwise, by approximately the same throttle devices in the air pipe and / or exhaust pipe, generates the differential pressure at the points described so that the desired partial exhaust gas quantity is available for exhaust gas recirculation.
  • Figures 1-4 show exemplary embodiments of atmospheric gas heating devices with common combustion air / exhaust gas routing, which are designed both as wall devices and as floor devices.
  • the atmospheric gas burner 20 is attached to the lower, open end of the radiator 1 and has a rod-shaped or round shape.
  • the primary air supply 3 with gas nozzle 4 and mixing tube 5 are located in the area of the air supply, which can be formed on one side as an air duct to the radiator 1 or as an annular duct 6 through the casing to the radiator 1, in any case in the atmospheric burner area a uniform air distribution both in the primary air supply 3 as well as in the secondary air area 7.
  • the exhaust gases are collected by the fan wheel 8 with the motor 9 in the exhaust gas box 19 and conveyed to the outside via the exhaust pipe 10a.
  • the air pipe 11 is arranged centrally to the exhaust pipe 10a to bring the combustion air 21.
  • the length of the exhaust pipe 10a and the air pipe 11 depends on the local conditions, but in practice is also carried out on the outer wall 22 up to the roof, in particular in modern condensing heating devices.
  • one or more overflow openings 12a are arranged at some point in the described double-pipe system “exhaust pipe” and “air pipe” in FIG. 1 such that a differential pressure builds up in the exhaust pipe 10a and / or air pipe 11a downstream in the direction of outside air, which a transfer of a partial exhaust gas quantity from the exhaust pipe into causes the air tube, the magnitude of which depends on the differential pressure, ie the set throttle device, and on the number and size of the overflow openings.
  • the throttle device can consist of ring diaphragms 14.1 or bead-shaped pipe constrictions 14.2, of partial diaphragms 15 or fixed throttle valves 13.
  • the overflow opening 12b shown in FIG. 2a can also represent a line 23 if the exhaust pipe 10b and the air pipe 11b are arranged somewhat further apart when guided to the outside.
  • Figures 3 and 4 show the same gas heater in side view and longitudinal section with a conveying fan arranged in the combustion air path 21, the fan wheel 8 being seated in the air intake box 18 and being driven by the motor 9.
  • the combustion air 21 is drawn in from the outside via the air pipe 11.
  • the exhaust gases are discharged via the exhaust pipe 10a.
  • exhaust pipe 10a and air pipe 11b are arranged side by side.
  • the exhaust gas recirculation also works in atmospheric gas heating devices without a conveying fan if a sufficiently high heating element 1 provides positive pressure due to buoyancy.
  • the external exhaust gas recirculation is realized in a structurally simple manner and without economic effort, which enables a decisive No X reduction below 57 ppm, which is practically pollutant-free in the sense of an environment stressful gas heating can apply to small devices.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)

Abstract

The appliance has a closed combustion chamber, an exhaust-gas tube (10a) and an air tube (11a), serving to supply combustion air, as well as a means outside the combustion chamber of recycling part of the exhaust gas for NOx reduction of the said gas, there being between exhaust-gas tube (10a) and air tube (11a) at least one overflow connection (12a) for the exhaust-gas recirculation and there being a restricting device (13) arranged downstream in the exhaust-gas tube (10a), and respectively upstream in the air tube (11a), to produce an adequate differential pressure for the defined amount of exhaust gas to flow over. <IMAGE>

Description

Die Erfindung dient zur Reduzierung von NOx bei Gasheizgeräten, die mit atmosphärischem Gasbrenner ausgerüstet sind und eine zentrale, d.h. gemeinsame Verbrennungsluftzuführungs- und Abgasabführungsleitung aufweisen.The invention serves to reduce NO x in gas heaters that are equipped with atmospheric gas burners and have a central, ie common combustion air supply and exhaust gas discharge line.

Als Gegenstand der Erfindung wird eine neuartige Abgasrückführung verwendet, die ohne zusätzliche Fördereinrichtungen die Abgasrückführung einer Teilabgasmenge zurück zum atmosphärischen Gasbrenner ermöglicht und damit unter bisher nicht bekannten wirtschaftlichen Bedingungen eine ausreichende Reduzierung des NOx-Anteils in den Abgasen herbeiführt.As a subject of the invention, a new type of exhaust gas recirculation is used which enables the exhaust gas recirculation of a partial exhaust gas quantity back to the atmospheric gas burner without additional conveying devices and thus brings about a sufficient reduction in the NO x content in the exhaust gases under previously unknown economic conditions.

Bekannt sind atmosphärische Gasheizgeräte, die als sogenannte "Außenwandgeräte" mit ihrer Verbrennungsluftleitung und Abgasleitung durch die Außenwand hindurch mit der Außenatmosphäre in Verbindung stehen. Leitungen und Feuerraum sind hierbei hermetisch gegen den zu beheizenden Raum dicht abgeschlossen. Durch den Eigenauftrieb der Abgase im Feuerraum wird dieses nur zur Atmosphäre nach außen hin offende System angetrieben. Um längere Verbrennungsluft-und Abgasleitungen nach außen und z.B. über das Dach führend zu ermöglichen, sind solche atmosphärischen Gasheizgeräte auch zusätzlich mit einem Fördergebläse ausgerüstet, das entweder im Verbrennungsluftstrom oder im Abgasstrom angeordnet ist.Atmospheric gas heaters are known which, as so-called "outer wall units", are connected to the outside atmosphere with their combustion air line and exhaust line through the outer wall. Pipes and combustion chamber are hermetically sealed against the room to be heated. Due to the self-boosting of the exhaust gases in the combustion chamber, this system, which only opens to the atmosphere, is driven. To extend combustion air and exhaust pipes to the outside and e.g. To allow leading over the roof, such atmospheric gas heaters are also additionally equipped with a conveying fan, which is arranged either in the combustion air flow or in the exhaust gas flow.

Andererseits sind auch Großanlagen bekannt, die mit externen Abgasrückführungen zum Zwecke der NOx-Reduzierung ausgerüstet sind, bei denen eine Abgasteilmenge bis zu 25% aus dem Abgasrohr hinter dem Heizgerät über ein spezielles, direkt in der Abgasrückführungsleitung eingebautes Fördergebläse zurück in den Brennerkopf des Gebläsebrenners gefördert wird.On the other hand, large systems are also known, which are equipped with external exhaust gas recirculation for the purpose of NO x reduction, in which a partial exhaust gas quantity of up to 25% from the exhaust pipe behind the heater is fed back into the burner head of the forced draft burner via a special delivery fan built directly into the exhaust gas recirculation line is promoted.

Solche Ausführungen eignen sich bisher aus wirtschaftlichen Gründen nicht für Heizanlagen unter 10 MW, da einzusätzlicher Kostenaufwand für die Installation und die laufenden Betriebs-und Wartungskosten erforderlich ist. Ferner ist der durch das zusätzliche Fördergebläse entstehende höhere Geräuschpegel bei Hausheizungen bisher als nachteilig angesehen worden.For economic reasons, such designs have so far not been suitable for heating systems of less than 10 MW, since additional costs for the installation and the ongoing operating and maintenance costs are required. In addition, the higher noise level in domestic heating systems which is caused by the additional conveyor fan has previously been regarded as disadvantageous.

Die erfinderische Lösung beim Gegenstand der Erfindung ermöglicht eine außerhalb des Feuerraums stattfindende Rückführung einer Abgasteilmenge aus dem Abgasrohr unmittelbar in das benachbarte entweder daneben oder zentral außen herum liegende Luftrohr. Dabei wird auf einfachste Weise ohne erheblichen zusätzlichen Aufwand die Abgasteilmenge im Abgasrohr über eine oder mehrere definierte Öffnungen bei einem eingestellten und/oder einstellbaren Differenzdruck vom Abgasrohr in das Luftrohr übergeführt, von wo es direkt zum atmosphärischen Gasbrenner und dessen Feuerraum gelangt und dort die NOx-Reduzierung bewirkt. Die Abgasteilmenge gelangt dabei im gleichen Verhältnis wie die Verbrennungsluftmenge sowohl in die Primärluftvormischung sowie in den Sekundärluftbereich des atmosphärischen Gasbrenners.The inventive solution in the subject matter of the invention enables a return of an exhaust gas partial quantity taking place outside the combustion chamber from the exhaust pipe directly into the adjacent air pipe either lying next to it or centrally outside. The exhaust gas partial quantity in the exhaust pipe is transferred in the simplest manner from the exhaust pipe into the air pipe via one or more defined openings at a set and / or adjustable differential pressure, from where it goes directly to the atmospheric gas burner and its combustion chamber and there the NO x - Reduction causes. The partial exhaust gas quantity reaches the same ratio as the combustion air quantity both in the primary air premix and in the secondary air area of the atmospheric gas burner.

Anhand von Ausführungsbeispielen wird die vorliegende Erfindung erläutert. Die beschriebenen Ausführungsbeispiele unterscheiden sich hauptsächlich darin, daß das die Abgase transportierende und gleichzeitig die Luft ansaugende Gebläse einmal im Luftkanal und einmal im Abgasweg angebracht ist, ansonsten etwa durch dieselben Drosseleinrichtungen im Luftrohr und/oder Abgasrohr an den beschriebenen Stellen den Differenzdruck so erzeugt, daß die gewünschte Abgasteilmenge zur Abgasrückführung zur Verfügung steht.The present invention is explained on the basis of exemplary embodiments. The described embodiments differ mainly in that the exhaust gas-transporting and at the same time the air-sucking fan is attached once in the air duct and once in the exhaust gas path, otherwise, by approximately the same throttle devices in the air pipe and / or exhaust pipe, generates the differential pressure at the points described so that the desired partial exhaust gas quantity is available for exhaust gas recirculation.

Die Bilder 1-4 stellen Ausführungsbeispiele von atmosphärischen Gasheizgeräten mit gemeinsamer Verbrennungsluft-/Abgasführung dar, die sowohl als Wandgeräte, wie als Bodengeräte ausgeführt sind. Bei allen beschriebenen Gasheizgeräten ist am unteren, offenen Ende des Heizkörpers 1 der atmosphärische Gasbrenner 20 angebracht, der stab-oder rundförmig ausgebildet ist.Figures 1-4 show exemplary embodiments of atmospheric gas heating devices with common combustion air / exhaust gas routing, which are designed both as wall devices and as floor devices. In all of the gas heating devices described, the atmospheric gas burner 20 is attached to the lower, open end of the radiator 1 and has a rod-shaped or round shape.

Die Primärluftzuführung 3 mit Gasdüse 4 und Mischrohr 5 befinden sich im Bereich der Luftzuführung, die einseitig als Luftkanal zum Heizkörper 1 oder als Ringkanal 6 durch die Ummantelung zum Heizkörper 1 ausgebildet sein kann, auf jeden Fall im atmosphärischen Brennerbereich eine gleichmäßige Luftverteilung sowohl im Primärluftzuführung 3 wie auch im Sekundärluftbereich 7 gewährleistet.The primary air supply 3 with gas nozzle 4 and mixing tube 5 are located in the area of the air supply, which can be formed on one side as an air duct to the radiator 1 or as an annular duct 6 through the casing to the radiator 1, in any case in the atmospheric burner area a uniform air distribution both in the primary air supply 3 as well as in the secondary air area 7.

Bei dem in Bild 1 und 2a dargestellten Ausführungsbeispiel werden die Abgase durch das Lüfterrad 8 mit Motor 9 im Abgaskasten 19 gesammelt und über das Abgasrohr 10a ins Freie gefördert. Im Bild 1 ist das Luftrohr 11 zur Heranführung der Verbrennungsluft 21 zentral zum Abgasrohr 10a angeordnet.In the exemplary embodiment shown in FIGS. 1 and 2a, the exhaust gases are collected by the fan wheel 8 with the motor 9 in the exhaust gas box 19 and conveyed to the outside via the exhaust pipe 10a. In Figure 1, the air pipe 11 is arranged centrally to the exhaust pipe 10a to bring the combustion air 21.

Die Länge des Abgasrohrs 10a und des Luftrohrs 11 richtet sich nach den örtlichen Gegebenheiten, wird aber in der Praxis auch an der Außenwand 22 hoch bis über das Dach geführt, insbesonders bei modernen Brennwertheizgeräten.The length of the exhaust pipe 10a and the air pipe 11 depends on the local conditions, but in practice is also carried out on the outer wall 22 up to the roof, in particular in modern condensing heating devices.

In Bild 2a verläuft das Abgasrohr 10b neben dem Luftrohr 11b, beide Rohre sind also nebeneinander angeordnet.In Figure 2a, the exhaust pipe 10b runs next to the air pipe 11b, so both pipes are arranged side by side.

Erfindungsgemäß sind im Bild 1 an irgendeiner Stelle des beschhriebenen Doppelrohr-Systems "Abgasrohr" und "Luftrohr" eine oder mehrere Überstromöffnungen 12a so angeordnet, daß sich bei stromabwärts in Richtung Außenluft im Abgasrohr 10a und/oder Luftrohr 11a angebrachten Drosselklappe 13 ein Differenzdruck aufbaut, der einen Übertritt einer Abgasteilmenge vom Abgasrohr in das Luftrohr bewirkt, dessen Größenordnung einmal vom Differenzdruck d.h. der eingestellten Drosseleinrichtung und zum anderen von der Anzahl und Größe der Überströmöffnungen abhängt.According to the invention, one or more overflow openings 12a are arranged at some point in the described double-pipe system “exhaust pipe” and “air pipe” in FIG. 1 such that a differential pressure builds up in the exhaust pipe 10a and / or air pipe 11a downstream in the direction of outside air, which a transfer of a partial exhaust gas quantity from the exhaust pipe into causes the air tube, the magnitude of which depends on the differential pressure, ie the set throttle device, and on the number and size of the overflow openings.

Die Drosseleinrichtung kann aus Ringblenden 14.1 oder sickenförmigen Rohrverengungen 14.2, aus Teilblenden 15 oder festeingestellten Drosselklappen 13 bestehen. Die in Bild 2a dargestellte Überströmöffnung 12b kann auch eine Leitung 23 darstellen, wenn Abgasrohr 10b und Luftrohr 11 b etwas weiter auseinander bei der Führung nach außen angeordnet sind.The throttle device can consist of ring diaphragms 14.1 or bead-shaped pipe constrictions 14.2, of partial diaphragms 15 or fixed throttle valves 13. The overflow opening 12b shown in FIG. 2a can also represent a line 23 if the exhaust pipe 10b and the air pipe 11b are arranged somewhat further apart when guided to the outside.

Bild 3 und 4 zeigen dasselbe Gasheizgerät in Seitenansicht und Längsschnitt mit im Verbrennungsluftweg 21 angeordnetem Fördergebläse, wobei das Lüfterrad 8 im Luftansaugkasten 18 sitzt und vom Motor 9 angetrieben wird. Die Verbrennungsluft 21 wird über das Luftrohr 11 von außen angesaugt. Die Abgase werden über das Abgasrohr 10a abgeführt.Figures 3 and 4 show the same gas heater in side view and longitudinal section with a conveying fan arranged in the combustion air path 21, the fan wheel 8 being seated in the air intake box 18 and being driven by the motor 9. The combustion air 21 is drawn in from the outside via the air pipe 11. The exhaust gases are discharged via the exhaust pipe 10a.

In Bild 3 ist das Abgasrohr 10b zentrisch zum umgebenden Luftrohr 11 angeordnet.In Figure 3, the exhaust pipe 10b is arranged centrally to the surrounding air pipe 11.

In Bild 4 sind Abgasrohr 10a und Luftrohr 11b nebeneinander angeordnet.In Figure 4, exhaust pipe 10a and air pipe 11b are arranged side by side.

Wie schon in den Bildern 1 und 2 beschrieben, befinden sich dort in genau der gleichen Art und Weise die erfinderischen Maßnahmen 13 und 14, die das Überströmen einer Abgasteilmenge vom Abgasrohr in das Luftrohr gewährleisten. Das darüber in Bild 1 und 2a Beschriebene kann für Bild 3 und 4 gelten.As already described in Figures 1 and 2, the inventive measures 13 and 14 are located in exactly the same way, which ensure that a partial amount of exhaust gas flows from the exhaust pipe into the air pipe. The above described in Figures 1 and 2a can apply to Figures 3 and 4.

Wie auch bereits eingangs festgestellt, funktioniert mit den erfindungsgemäßen Maßnahmen 12, 13, 14, 15 und 23 die Abgasrückführung auch bei atmosphärischen Gasheizgeräten ohne Fördergebläse, wenn ein ausreichend hoher Heizkörper 1 für Überdruck durch Auftrieb sorgt.As already stated at the beginning, with measures 12, 13, 14, 15 and 23 according to the invention, the exhaust gas recirculation also works in atmospheric gas heating devices without a conveying fan if a sufficiently high heating element 1 provides positive pressure due to buoyancy.

Wie aus den beschriebenen erfindungemäßen Ausführungsbeispielen der atmosphärischen Gasheizgeräte mit Außenwandanschluß hervorgeht, wird auf konstruktiv einfache Weise und ohne wirtschaftlichen Aufwand die externe Abgasrückführung verwirklicht, die eine entscheidende NoX-Reduzierung unter 57 ppm ermöglicht, was als praktisch schadstofffrei im Sinne einer die Umwelt nicht mehr belastenden Gasheizung bei kleinen Geräten gelten kann.As can be seen from the described exemplary embodiments of the atmospheric gas heaters with an external wall connection, the external exhaust gas recirculation is realized in a structurally simple manner and without economic effort, which enables a decisive No X reduction below 57 ppm, which is practically pollutant-free in the sense of an environment stressful gas heating can apply to small devices.

Claims (9)

1. An atmospheric gas heating appliance with an enclosed combustion chamber, with an exhaust pipe, an air inlet pipe which serves the purpose of bringing in air for combustion, and with a means outside the combustion chamber for leading part of the exhaust gas back in order to reduce the NOx content of the exhaust, characterised by there being between the exhaust pipe (10a, 10b) and the air inlet pipe (11 a, 11b) at least one overflow connection (12, 12a, 12b, 23) for leading back exhaust gases, and by there being at least one choke (13, 14.1, 14.2) fitted in the exhaust pipe (10a, 10b) downstream or in the air inlet (11 a, 11 b) and upstream of the overflow connection (12, 12a, 12b, 23) for the purpose of producing a sufficient pressure differential so that a defined proportion of the exhaust gas overflows.
2. An atmospheric gas heating appliance on the lines of Claim 1, characterised by the fact that a ventilator wheel (8) is mounted in the stream of combustion air.
3. An atmospheric gas heating on the lines of Claim 1, characterised by the fact that a ventilator wheel (8) is mounted in the stream of exhaust gas.
4. An atmospheric gas heating on the lines of Claims 1-3, characterised by the fact that the exhaust pipe (10a) and the air inlet pipe (11 a) are mounted concentrically to one another and that the overflow connection (12, 12a) is present in the dividing wall between the streams of gas.
5. An atmospheric gas heating on the lines of Claims 1-3, characterised by the fact that the exhaust pipe (10b) and the air inlet pipe (11b) are mounted at a distance from one another and that a short circuit lead (12, 12b, 23) is provided as overflow connection.
6. An atmospheric gas heating on the lines of one of the foregoing Claims, characterised by the fact that the entrance (12) to the overflow connection (23) is mounted contrary to the direction of the flow of the exhaust gases.
7. An atmospheric gas heating on the lines of one of the foregoing Claims, characterised by the fact that the opening of the overflow connector in the air inlet pipe (11 b) points in the direction of the air stream.
8. An atmospheric gas heating on the lines of one of the foregoing Claims, characterised by the fact that at least part of the choke devices are in the form of an annular ring (14.2) or crimp restriction (14.1) or partial baffle (15).
9. An atmospheric gas heating on the lines of one of the foregoing Claims, characterised by the fact that at least one choke flap (13) serves as a choke device which can be set perfectly in any desired position.
EP87118903A 1986-12-20 1987-12-19 Atmospheric gas heating appliance with an external exhaust gas recycling Expired - Lifetime EP0272660B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87118903T ATE66527T1 (en) 1986-12-20 1987-12-19 ATMOSPHERIC GAS HEATER WITH EXTERNAL EXHAUST GAS RECIRCULATION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863643797 DE3643797A1 (en) 1986-12-20 1986-12-20 ATMOSPHERIC GAS HEATER WITH EXTERNAL EXHAUST GAS RECIRCULATION FOR NO (DOWN ARROW) X (DOWN ARROW) REDUCTION
DE3643797 1986-12-20

Publications (4)

Publication Number Publication Date
EP0272660A2 EP0272660A2 (en) 1988-06-29
EP0272660A3 EP0272660A3 (en) 1989-10-18
EP0272660B1 true EP0272660B1 (en) 1991-08-21
EP0272660B2 EP0272660B2 (en) 1995-11-22

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EP87118903A Expired - Lifetime EP0272660B2 (en) 1986-12-20 1987-12-19 Atmospheric gas heating appliance with an external exhaust gas recycling

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AT (1) ATE66527T1 (en)
DE (2) DE3643797A1 (en)

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IT1235432B (en) * 1988-11-16 1992-07-10 Sarno Cosimo FOUR-POINT DEAD POINT CRANK
DE19510426A1 (en) * 1995-03-24 1996-09-26 Bosch Gmbh Robert heater
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Also Published As

Publication number Publication date
ATE66527T1 (en) 1991-09-15
EP0272660B2 (en) 1995-11-22
EP0272660A3 (en) 1989-10-18
DE3643797A1 (en) 1988-06-23
DE3772355D1 (en) 1991-09-26
EP0272660A2 (en) 1988-06-29

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