EP0303052B1 - Gas burner - Google Patents

Gas burner Download PDF

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Publication number
EP0303052B1
EP0303052B1 EP88110907A EP88110907A EP0303052B1 EP 0303052 B1 EP0303052 B1 EP 0303052B1 EP 88110907 A EP88110907 A EP 88110907A EP 88110907 A EP88110907 A EP 88110907A EP 0303052 B1 EP0303052 B1 EP 0303052B1
Authority
EP
European Patent Office
Prior art keywords
gas
mixture
outlet openings
burner
primary air
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
Application number
EP88110907A
Other languages
German (de)
French (fr)
Other versions
EP0303052A1 (en
Inventor
Hans-Albrecht Kohlmann
Thomas Pieper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vaillant BV
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Vaillant-Schonewelle BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vaillant Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, Vaillant-Schonewelle BV filed Critical Vaillant Austria GmbH
Publication of EP0303052A1 publication Critical patent/EP0303052A1/en
Application granted granted Critical
Publication of EP0303052B1 publication Critical patent/EP0303052B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone

Definitions

  • the invention relates to a gas burner with at least one fuel rod, the wall of which is penetrated on the upper side by outlet openings for a fuel gas / primary air mixture, wherein guides for a non-ignitable gas or gas mixture are provided in the area above these outlet openings.
  • FR-OS 25 84 798 a continuous or storage water heater with an atmospheric gas burner has become known, in which recirculated exhaust gas is mixed with the secondary air flow and is led into the area of the flame root of the individual main burner flames.
  • a cover flanking the burner tip is used, which form spaces on the side of the flat burner plate for the exit of the exhaust gas / secondary air mixture.
  • the disadvantage here is in particular the considerable distance between the outlet openings for the exhaust gas / secondary air mixture and the fuel gas / primary air mixture.
  • the object of the invention is to provide simply constructed guides which generate a homogeneous gas or gas mixture stream in order to achieve combustion which is as pollutant-free as possible.
  • an air-enriched fuel gas which, due to its high air content, is no longer ignitable, i.e. the fuel gas content is less than 4.5% by volume (for H gas).
  • a pure fuel gas can also be considered as an admixture, and a fuel gas / air mixture with a fuel gas content of more than 13.4% by volume (for H gas).
  • the total air ratio can be reduced and the combustion efficiency can be improved by an optimized way of supplying the gas-secondary air mixture or other gas.
  • the flame temperature is reduced by this supply and the NO x emission is thereby reduced.
  • a non-ignitable mixture of gas and secondary air namely reduces the oxygen content of this secondary air and thereby lowers the flame temperature. If, on the other hand, pure gas is supplied, the exhaust gases are used to reduce the oxygen content of the secondary air, and so to speak there is a step combustion.
  • the aim of this guide is above all essential, and there are two possibilities within the scope of the invention to carry out such arrangements promisingly, without running the risk that unburned secondary gas gets into the exhaust gas flue.
  • a closer proximity of both outlet openings can be achieved according to a first solution in that a distributor forming the guides for the gas or the gas mixture at least partially encloses the fuel rod fed with the fuel gas / primary air mixture, with longitudinal sections in which the mixture outlet openings of the fuel rod are supplied with the fuel gas-primary air mixture, with longitudinal sections of the distributor, which have outlet openings for the gas or the gas mixture, change in a constant sequence.
  • a distributor for the gas or the gas mixture can also be supplied in a tubular form, which is fed with the fuel gas / primary air mixture Include fuel rod up to the two boundaries of its apex area having the mixture outlet openings and have outlet openings for the gas or the gas mixture with mouths directed towards the apex area at the two tips of its crescent-shaped cross section.
  • the target direction of the flanking outlet openings can be determined particularly well and reliably in this way, especially when the apex region is flattened.
  • the non-ignitable gas or gas mixture is preferably pure inert gas or a mixture of fuel gas and secondary air or recirculated flue gas and secondary air.
  • FIGS. 1 to 5 illustrate an embodiment of a gas burner, according to which a tubular distributor 1 of the gas-secondary air mixture surrounds the fuel rod 2 supplied with the fuel gas-primary air mixture according to FIG. 2, longitudinal sections 3 and 4 of these two guides 1 and 2, respectively , in which outlet openings 5 and 6 are provided for one and the other of the different mixtures, alternate with one another according to FIG. 3.
  • the sections 4 of the distributor 1 guiding the gas-secondary air mixture are connected to one another via its bottom region.
  • the outlet openings 6 for the gas-secondary air mixture can, as shown in FIGS. 4 and 5, be directed radially or obliquely against the region located above the outlet openings 5.
  • FIGS. 6 to 8 show embodiments in which a tube forming the distributor 7 for a gas / secondary air mixture contains the likewise tubular fuel rod 2, which is fed with the fuel gas / primary air mixture, up to the bilateral limits of the apex region 7 through which mixture outlet openings 5 pass comprises and forms or delimits the outlet openings 6 for the gas-secondary air mixture at the two ends of the sickle-shaped cross section.
  • FIG. 8 shows a modified embodiment with a flattened apex region 7 of the fuel rod 2. This flattening facilitates the inflow of the gas-secondary air mixture to the outlet openings 5 of the burner rod 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Glass Compositions (AREA)
  • Gas Separation By Absorption (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

A gas burner has at least one burner rod (6), the wall of which is passed through on the upper side by outlet openings (2) for a gas mixture consisting of combustion gas and primary air. The region situated above these mixture outlet openings (2) is assigned guides (5), via which a mixture consisting of gas and secondary air or pure gas is supplied to the flames being formed above the outlet openings (2). The guides (5) can be formed by the outlet openings (8) of mixture or gas distributors (7) which run parallel next to the burner rod (6). Such distributors (7) can be interconnected by connection pipes (9) which run transversely to the axis of the burner rod (6) and which have outlet openings for the gas/secondary air mixture. Such a distributor (7) can also, however, partially enclose the burner rod (6), leaving the top region (12) with the mixture outlet openings (2) free and forming at the two boundaries of this top region outlet openings for the gas/secondary air mixture or other gases such as e.g. recycled smoke gas. <IMAGE>

Description

Die Erfindung betrifft einen Gasbrenner mit zumindest einem Brennstab, dessen Wandung oberseitig von Austrittsöffnungen für ein Brenngas-Primärluft-Gemisch durchsetzt ist, wobei auf den Bereich oberhalb dieser Austrittsöffnungen zielende Führungen für ein nicht zündfähiges Gas oder Gasgemisch vorgesehen sind.The invention relates to a gas burner with at least one fuel rod, the wall of which is penetrated on the upper side by outlet openings for a fuel gas / primary air mixture, wherein guides for a non-ignitable gas or gas mixture are provided in the area above these outlet openings.

Aus der FR-OS 25 84 798 ist ein Durchlauf- oder Speicher-Wasserheizer mit einem atmosphärischen Gasbrenner bekanntgeworden, bei dem rezirkuliertes Abgas dem Sekundärluftstrom beigemischt und in den Bereich der Flammenwurzel der einzelnen Hauptbrennerflammen geführt wird. Dazu dient eine die Brennerspitze flankierende Abdeckung, welche seitlich der ebenen Brennerplatte Zwischenräume für den Austritt des Abgas-Sekundärluft-Gemisches bilden. Nachteilig hierbei ist neben der Beschränkung auf rezirkuliertes Abgas insbesondere auch der erhebliche Abstand der Austrittsöffnungen für das Abgas-Sekundärluft-Gemisch und das Brenngas-Primärluft-Gemisch.From FR-OS 25 84 798 a continuous or storage water heater with an atmospheric gas burner has become known, in which recirculated exhaust gas is mixed with the secondary air flow and is led into the area of the flame root of the individual main burner flames. For this purpose, a cover flanking the burner tip is used, which form spaces on the side of the flat burner plate for the exit of the exhaust gas / secondary air mixture. In addition to the restriction to recirculated exhaust gas, the disadvantage here is in particular the considerable distance between the outlet openings for the exhaust gas / secondary air mixture and the fuel gas / primary air mixture.

Aufgabe der Erfindung ist es, einfach aufgebaute, einen homogenen Gas- oder Gasgemischstrom erzeugende Führungen anzugeben, um eine möglichst schadstofffreie Verbrennung zu erzielen.The object of the invention is to provide simply constructed guides which generate a homogeneous gas or gas mixture stream in order to achieve combustion which is as pollutant-free as possible.

Als ein den Brennerflammen zuzumischendes Gas-Sekundärluft-Gemisch ist empfehlenswerterweise ein luftangereichertes Brenngas zu verwenden, das infolge seines hohen Luftgehaltes nicht mehr zündfähig ist, also daß der Brenngasanteil kleiner 4,5 Vol.-% (für H-Gas) beträgt. Es kann aber auch ein pures Brenngas als Zumischung in Betracht gezogen werden sowie ein Brenngas-Luft-Gemisch mit einem Brenngasanteil von mehr als 13,4 Vol.-% (für H-Gas).As a gas-secondary air mixture to be mixed with the burner flames, it is advisable to use an air-enriched fuel gas which, due to its high air content, is no longer ignitable, i.e. the fuel gas content is less than 4.5% by volume (for H gas). However, a pure fuel gas can also be considered as an admixture, and a fuel gas / air mixture with a fuel gas content of more than 13.4% by volume (for H gas).

Zu vermeiden ist jedenfalls, daß unverbrauchtes Sekundärgas in den Abgaszug eintritt, wodurch eine starke CxHy-Emission verursacht werden würde. Durch eine optimierte Art der Zufuhr des Gas-Sekundärluft-Gemisches oder sonstigen Gases kann die Gesamtluftzahl abgesenkt und der Wirkungsgrad der Verbrennung verbessert werden. Zunächst wird durch diese Zufuhr die Flammentemperatur verringert und die NOx-Emission dadurch herabgesetzt. Ein nicht zündfähiges Gemisch aus Gas und Sekundärluft verringert nämlich den Sauerstoffgehalt dieser Sekundärluft und senkt dadurch die Flammentemperatur. Wird hingegen pures Gas zugeführt, dienen die Abgase dessen Verbrennung der Reduzierung des Sauerstoffgehaltes der Sekundärluft, und es erfolgt gewissermaßen eine Stufenverbrennung.In any case, it must be avoided that unused secondary gas enters the exhaust gas flue, which would cause a strong C x H y emission. The total air ratio can be reduced and the combustion efficiency can be improved by an optimized way of supplying the gas-secondary air mixture or other gas. First of all, the flame temperature is reduced by this supply and the NO x emission is thereby reduced. A non-ignitable mixture of gas and secondary air namely reduces the oxygen content of this secondary air and thereby lowers the flame temperature. If, on the other hand, pure gas is supplied, the exhaust gases are used to reduce the oxygen content of the secondary air, and so to speak there is a step combustion.

Für eine im Sinne der Erfindung zielführende Anordnung der Führungen des Gas-Sekundärluft-Gemisches oder puren Gases ist vor allem die Zielrichtung dieser Führung von wesentlicher Bedeutung, und es stehen diesbezüglich im Rahmen der Erfindung zwei Möglichkeiten offen, solche Anordnungen erfolgversprechend durchzuführen, ohne Gefahr zu laufen, daß unverbranntes Sekundärgas in den Abgaszug gelangt.For a target-oriented arrangement of the guides of the gas-secondary air mixture or pure gas in the sense of the invention, the aim of this guide is above all essential, and there are two possibilities within the scope of the invention to carry out such arrangements promisingly, without running the risk that unburned secondary gas gets into the exhaust gas flue.

Eine nähere Nachbarschaft beiderlei Austrittsöffnungen kann einer ersten Lösung zufolge dadurch erzielt werden, daß ein die Führungen bildender Verteiler für das Gas oder das Gasgemisch den mit dem Brenngas-Primärluft-Gemisch gespeisten Brennstab zumindest teilweise umschließt, wobei Längsabschnitte, in denen die Gemischaustrittsöffnungen des Brennstabes mit dem Brenngas-Primärluft-Gemisch versorgt sind, mit Längsabschnitten des Verteilers, welche Austrittsöffnungen für das Gas oder das Gasgemisch aufweisen, in steter Folge wechseln. Mit dieser Maßnahme erreicht man ein sehr inniges Zusammenwirken der verschiedenen Austrittsöffnungen im Sinne der Erfindung, und zwar insbesondere dann, wenn die Austrittsöffnungen für das Gas oder das Gasgemisch schräg gegen die oberhalb der benachbarten Austrittsöffnungen für das Brenngas-Primärluft-Gemisch gelegenen Bereiche gerichtete Mündungen aufweisen.A closer proximity of both outlet openings can be achieved according to a first solution in that a distributor forming the guides for the gas or the gas mixture at least partially encloses the fuel rod fed with the fuel gas / primary air mixture, with longitudinal sections in which the mixture outlet openings of the fuel rod are supplied with the fuel gas-primary air mixture, with longitudinal sections of the distributor, which have outlet openings for the gas or the gas mixture, change in a constant sequence. With this measure, a very intimate interaction of the various outlet openings in the sense of the invention is achieved, in particular when the outlet openings for the gas or the gas mixture have openings which are directed obliquely towards the areas above the adjacent outlet openings for the fuel gas / primary air mixture .

Einer zweiten unabhängigen Lösung zufolge kann ein Verteiler für das Gas oder das Gasgemisch auch einen rohrförmigen, mit dem Brenngas-Primärluft-Gemisch gespeisten Brennstab bis an die beiden Grenzen seines die Gemischaustrittsöffnungen aufweisenden Scheitelbereiches umfassen und an den beiden Spitzen seines sichelförmigen Querschnittes Austrittsöffnungen für das Gas oder das Gasgemisch mit gegen den Scheitelbereich gerichteten Mündungen aufweisen. Die Zielrichtung der flankierenden Austrittsöffnungen kann auf diese Weise besonders gut und zuverlässig bestimmt werden, insbesondere dann, wenn der Scheitelbereich abgeflacht ausgebildet wird.According to a second independent solution, a distributor for the gas or the gas mixture can also be supplied in a tubular form, which is fed with the fuel gas / primary air mixture Include fuel rod up to the two boundaries of its apex area having the mixture outlet openings and have outlet openings for the gas or the gas mixture with mouths directed towards the apex area at the two tips of its crescent-shaped cross section. The target direction of the flanking outlet openings can be determined particularly well and reliably in this way, especially when the apex region is flattened.

Das nicht zündfähige Gas oder Gasgemisch ist dabei vorzugsweise pures Inertgas oder ein Gemisch aus Brenngas und Sekundärluft beziehungsweise zurückgeführtem Rauchgas und Sekundärluft.The non-ignitable gas or gas mixture is preferably pure inert gas or a mixture of fuel gas and secondary air or recirculated flue gas and secondary air.

Verschiedene Ausführungsformen solcher Führungen sind mit weiteren Erfindungsmerkmalen in den Zeichnungen dargestellt und nachstehend an Hand dieser Zeichnungen erläutert.Various embodiments of such guides are shown with further features of the invention in the drawings and explained below with reference to these drawings.

Im einzelnen zeigen:

  • Figur 1 eine Teil-Draufsicht auf eine Ausführungsform eines erfindungsgemäß ausgestatteten Gasbrenners und
  • Figur 2 den zugehörigen Querschnitt nach II-II der Figur 1 sowie
  • Figur 3 einen zugehörigen Teil-Längsschnitt nach III-III der Figur 2. Die
  • Figuren 4 und 5 zeigen Details IV beziehungsweise V aus Figur 3 in größerem Maßstab, und
  • Figur 6 stellt eine weitere Ausführungsform dar, von der ein Detail VII in
  • Figur 7 und ein Variante in
  • Figur 8 dargestellt sind.
In detail show:
  • Figure 1 is a partial plan view of an embodiment of a gas burner equipped according to the invention and
  • Figure 2 shows the associated cross section according to II-II of Figure 1 and
  • 3 shows an associated partial longitudinal section according to III-III of Figure 2. Die
  • Figures 4 and 5 show details IV and V from Figure 3 on a larger scale, and
  • FIG. 6 shows a further embodiment, of which a detail VII in
  • Figure 7 and a variant in
  • Figure 8 are shown.

Die Figuren 1 bis 5 stellen eine Ausführungsform eines Gasbrenners dar, dergemäß ein rohrförmiger Verteiler 1 des Gas-Sekundärluft-Gemisches den mit dem Brenngas-Primärluft-Gemisch versorgten Brennstab 2 gemäß Figur 2 umschließt, wobei Längsabschnitte 3 beziehungsweise 4 dieser beiden Führungen 1 beziehungsweise 2, in denen Austrittsöffnungen 5 beziehungsweise 6 für das eine und andere der verschiedenen Gemische vorgesehen sind, einander gemäß Figur 3 abwechseln.FIGS. 1 to 5 illustrate an embodiment of a gas burner, according to which a tubular distributor 1 of the gas-secondary air mixture surrounds the fuel rod 2 supplied with the fuel gas-primary air mixture according to FIG. 2, longitudinal sections 3 and 4 of these two guides 1 and 2, respectively , in which outlet openings 5 and 6 are provided for one and the other of the different mixtures, alternate with one another according to FIG. 3.

Die das Gas-Sekundärluft-Gemisch führenden Abschnitte 4 des Verteilers 1 sind über dessen Bodenbereich miteinander verbunden.The sections 4 of the distributor 1 guiding the gas-secondary air mixture are connected to one another via its bottom region.

Die Austrittsöffnungen 6 für das Gas-Sekundärluft-Gemisch können, wie die Figuren 4 beziehungsweise 5 zeigen, radial oder schräg gegen den oberhalb der Austrittsöffnungen 5 gelegenen Bereich gerichtet sein.The outlet openings 6 for the gas-secondary air mixture can, as shown in FIGS. 4 and 5, be directed radially or obliquely against the region located above the outlet openings 5.

Schließlich zeigen die Figuren 6 bis 8 Ausführungsformen, bei denen ein den Verteiler 7 für ein Gas-Sekundärluft-Gemisch bildendes Rohr den gleichfalls rohrförmigen, mit dem Brenngas-Primärluft-Gemisch gespeisten Brennstab 2 bis zu den beidseitigen Grenzen dessen von Gemischaustrittsöffnungen 5 durchsetzten Scheitelbereiches 7 umfaßt und an den beiden Enden des dadurch sichelförmigen Querschnittes die Austrittsöffnungen 6 für das Gas-Sekundärluft-Gemisch bildet beziehungsweise begrenzt.Finally, FIGS. 6 to 8 show embodiments in which a tube forming the distributor 7 for a gas / secondary air mixture contains the likewise tubular fuel rod 2, which is fed with the fuel gas / primary air mixture, up to the bilateral limits of the apex region 7 through which mixture outlet openings 5 pass comprises and forms or delimits the outlet openings 6 for the gas-secondary air mixture at the two ends of the sickle-shaped cross section.

Die Figur 8 zeigt eine abgewandelte Ausführungsform mit einem abgeflachten Scheitelbereich 7 des Brennstabes 2. Diese Abflachung erleichtert den Zustrom des Gas-Sekundärluft-Gemisches zu den Austrittsöffnungen 5 des Brennerstabes 2.FIG. 8 shows a modified embodiment with a flattened apex region 7 of the fuel rod 2. This flattening facilitates the inflow of the gas-secondary air mixture to the outlet openings 5 of the burner rod 2.

Claims (5)

  1. A gas burner comprising at least one burner rod having a wall which is formed on its upper side with outlet openings for a fuel gas-primary air mixture, wherein ducts for guiding a non-ignitable gas or gas mixture are provided, which are directed to the region above said outlet openings, characterized in that a manifold (1) for distributing the gas or the gas mixture constitutes the ducts and surrounds the burner rod (2), which is supplied with the fuel gas-primary air mixture, and length portions (3) in which the mixture outlet openings (5) of the burner rod (2) are supplied with the fuel gas-primary air mixture alternate in a continuous sequence with length portions (4) of the manifold (1) which are formed with outlet openings (6) for the gas or gas mixture (Figures 1 to 5).
  2. A gas burner according to claim 1, characterized in that the outlet openings (6) for the gas or gas mixture have exit portions which are obliquely directed towards the regions disposed above the adjacent outlet openings (5) for the fuel gas-primary air mixture (Figure 5).
  3. A gas burenr comprising at least one burner rod having a wall which is formed on its upper side with outlet openings for a fuel gas-primary air mixture, wherein ducts for guiding a non-ignitable gas or Gasmixture are provided, which are directed to the region above said outlet openings, characterized in that a manifold (1) for distributing the gas or the gas mixture constitues the ducts and extends around the burner rod (2), which is supplied, with the fuel gas-primary air mixture, as far as to the two boundaries of its apex portion (7), which is formed with the mixture outlet openings (5), and at the two tips of its crescent-shaped cross-section has outlet openings (6) for the gas or gas mixture with exit portions directed towards the apex portion (7) (Figures 6 to 8).
  4. A gas burner according to claim 3, characterized in that the apex portion (7) of the burner rod (2) is flattened (Figure 8).
  5. A gas burner according to any of the preceding claims, characterized in that the non-ignitable gas or gas mixture is pure inert gas or a mixture of fuel gas and secondary air or of recycled flue gas and secondary air.
EP88110907A 1987-07-15 1988-07-08 Gas burner Expired - Lifetime EP0303052B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1783/87 1987-07-15
AT0178387A AT393891B (en) 1987-07-15 1987-07-15 GAS BURNER

Publications (2)

Publication Number Publication Date
EP0303052A1 EP0303052A1 (en) 1989-02-15
EP0303052B1 true EP0303052B1 (en) 1992-03-04

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ID=3520888

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Application Number Title Priority Date Filing Date
EP88110907A Expired - Lifetime EP0303052B1 (en) 1987-07-15 1988-07-08 Gas burner

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Country Link
EP (1) EP0303052B1 (en)
AT (2) AT393891B (en)
DE (2) DE3868771D1 (en)
ES (1) ES2030797T3 (en)
GR (1) GR3004554T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0579315A1 (en) * 1992-07-07 1994-01-19 Ingenieursburo P.I. Produkt Innovatie B.V. Burner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2584798A1 (en) * 1985-07-11 1987-01-16 Vaillant Sarl Continuous flow or storage water heater

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US763057A (en) * 1903-11-03 1904-06-21 Kern Burner Company Gas-radiator.
US1228579A (en) * 1916-06-08 1917-06-05 Simon N Mentel Stove.
DE411548C (en) * 1924-01-03 1925-03-28 Gustav Ahrens Gas heating furnace with return of the exhaust gases to the burner
CH504516A (en) * 1967-09-09 1971-03-15 Hoechst Ag Process for the preparation of new water-soluble disazo dyes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2584798A1 (en) * 1985-07-11 1987-01-16 Vaillant Sarl Continuous flow or storage water heater

Also Published As

Publication number Publication date
AT393891B (en) 1991-12-27
DE3868771D1 (en) 1992-04-09
ATA178387A (en) 1991-06-15
ATE73216T1 (en) 1992-03-15
DE3823956A1 (en) 1989-01-26
EP0303052A1 (en) 1989-02-15
ES2030797T3 (en) 1992-11-16
GR3004554T3 (en) 1993-04-28

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