EP0863365B1 - Steam generator - Google Patents

Steam generator Download PDF

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Publication number
EP0863365B1
EP0863365B1 EP97120542A EP97120542A EP0863365B1 EP 0863365 B1 EP0863365 B1 EP 0863365B1 EP 97120542 A EP97120542 A EP 97120542A EP 97120542 A EP97120542 A EP 97120542A EP 0863365 B1 EP0863365 B1 EP 0863365B1
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EP
European Patent Office
Prior art keywords
burner
passage
steam generator
ducts
generator according
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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EP97120542A
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German (de)
French (fr)
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EP0863365A2 (en
EP0863365A3 (en
Inventor
Jaroslav Klouda
Maarten Botman
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Rational AG
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Rational AG
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Publication of EP0863365A3 publication Critical patent/EP0863365A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B7/00—Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed inside one or more furnace tubes built-in in the boiler body
    • F22B7/12—Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed inside one or more furnace tubes built-in in the boiler body with auxiliary fire tubes; Arrangement of header boxes providing for return diversion of flue gas flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B13/00—Steam boilers of fire-box type, i.e. the combustion of fuel being performed in a chamber or fire-box with subsequent flue(s) or fire tube(s), both chamber or fire-box and flues or fire tubes being built-in in the boiler body
    • F22B13/005—Steam boilers of fire-box type, i.e. the combustion of fuel being performed in a chamber or fire-box with subsequent flue(s) or fire tube(s), both chamber or fire-box and flues or fire tubes being built-in in the boiler body with flues, other than fire tubes

Definitions

  • the invention relates to a steam generator according to the preamble of patent claim 1.
  • a steam generator for a cooking device in which a burner shaft with channels for heat exchange via a simple transverse shaft Cross-section is connected, which is formed in a steam boiler.
  • This way of construction is complex and does not lead to an optimal diversion of the exhaust gases of a burner, which are introduced into the burner shaft, to the channels of the heat exchanger section.
  • a generic steam generator is known from DE 28 07 166.
  • This Steam generators flow exhaust gases from a burner from a flame tube in which the The burner is located in smoke pipes via a final combustion chamber.
  • the smoke pipes run through a steam drum, in which there is a heat exchange between the the flue gases flowing and a boiler fluid in the steam drum comes.
  • a disadvantage of this steam generator is that it is also not constructive simple type to different exhaust gas flows, especially when using different Burner, can be adjusted to ensure an even distribution of exhaust gases to achieve the flue pipes.
  • the generic steam generator such to develop further that the disadvantages of the prior art are overcome.
  • a steam generator is to be created in which the transfer of gas flow from the burner to channels of a heat exchanger section with simple means an optimization which allows flow conditions in the channel or channels of the heat exchanger section, even without a new design and redesign of the internals of the steam generator an adaptation to different flow conditions, such as when using different Burner, is possible.
  • the insert can in particular form a flow bypass, which allows hot Exhaust gases in an area of the channels of the heat exchanger in which the exhaust gases are already cooled down and in which otherwise only a small heat exchange would take place, or the passage can be designed as a throttle, the gas passing through after the passage on the side of the heat exchanger section is relaxed.
  • connection of the burner shaft with the flow system of the heat exchanger section solved in a simple and elegant way, while at the same time the flow conditions in the passage through the choice of a particular shape of the Use during the production of the steam generator so that an optimal Distribution of the exhaust gas flow to the channels for heat exchange occurs.
  • the cross section of the passage between the burner shaft and the heat exchanger section can be set so that the proportion of the gas flow which to that of channels in the heat exchanger section which are further away from the burner shaft are enlarged and thus the distribution of the gas flow to the channels of the heat exchanger section is evened out. Since the use is independent of the steam boiler and the Burner shaft can be produced, other flow-guiding or limiting measures realized in a simple manner by appropriate shaping of the insert become.
  • the steam generator a steam boiler 1 filled with water with an outlet 3, through which steam can be removed.
  • the water level in the Steam boiler is indicated by hatched lines.
  • a burner shaft 5 is formed, in the over a Overheating protection tube 7 the exhaust gases of a gas burner (not shown) be initiated.
  • These exhaust gases become a heat exchanger section 10 passed, which a plurality of channels 12a, 12b unc 12c, which branch off from a distribution channel 14 and through which the flue gases of the burner to a fume cupboard be directed.
  • the distribution channel 14 also opens into the fume cupboard.
  • This opening is a H-shaped insert 20 used, two parallel each Flanges the insert after the two wall sections 15a and 15b Grasp kind of a groove, so that the insert by plugging and Moving can be assembled.
  • the insert 20 serves as a throttle shaft and has an upwardly closed cavity 22 on.
  • the insert 20 projects down over the lower neck of the Channels 12a to 12c and forms together with the wall sections 15a and 15b and the bottom of the opening between them Wall sections a passage 25 and thus a flow restriction for the gas stream coming from the burner shaft.
  • the distribution channel 14 extends in a lower area under the side channels 12a, 12b and 12c, see above that a deflection section with a larger cross section than that of the passage 25 is formed.
  • the insert 20 By moving the insert 20 can the cross section of the passage 25, which the Transition from the burner shaft 5 to the heat exchanger section 10 forms, are set so that particularly favorable flow conditions and an optimal heat transfer can be guaranteed.
  • This cross-section is used for operation by fixing the insert 20 kept constant.
  • the combustion chamber of the gas burner preferably goes directly into the overheating protection tube 7, which e.g. are made of steel can.
  • the overheating protection tube 7 conducts the exhaust gases of the burner to a level below the water level in the steam generator 1 and preferably up to approximately the level of the approach of the channels 12a to 12c. In this way it is avoided that the hot exhaust gases of the burner with a non-cooled wall section of the burner shaft 5 come in contact above the water level and there cause overheating.
  • the overheat protection tube Part of the burner's combustion chamber.
  • FIGS. 3 and 4 Invention has the insert 20 additional pipe sections 30 and 32 on which the distribution channel 14 with the inner cavity 22nd connect the insert 20.
  • the interior of the insert 20 forms thus an uncooled bypass section for part of the hot Exhaust gases that come from the burner shaft 5 and feed them hot Exhaust gases at locations of channels 12a to 12c where those Exhaust gases that have not been routed via insert 20 have already cooled down. This is a leveling out the heat transfer in the axial direction. Since the hot exhaust gases Area of the passage 25 are under a higher pressure, than the already cooled exhaust gases in the channels 12a to 12c at the level of the pipe connections 30 and 32, arises in the area of the passage 25 a suction into the shaft 22, the bypass flow through this shaft.
  • FIGS. 5 and 6 essentially corresponds to the embodiment according to FIG. 3 and 4.
  • the same constructed heat exchanger sections 110a and 110b are provided, which heat exchanger channels 112a to 112c and 112e to 112f, respectively and have distribution channels 114a and 114b.
  • Every heat exchanger section is associated with a hollow insert 120a or 120b, which in the Area of the connecting section with the combustion chamber 3 a Passage 125a and 125b limited and pipes 130a and 130a and 132b and 132b with which hot exhaust gases are passed to a higher one In place of the distribution shafts 114a and 114b can.
  • Heat exchanger sections also other heat exchanger sections be provided along for example an axis perpendicular to the connection axis between the heat exchanger sections 110a and 110b can be arranged. Others too for example ring or polygonal arrangements of Heat exchanger sections are possible. Likewise, several can 1 with each other or with heat exchangers 3 can be combined.
  • FIGS. 7 and 8 essentially corresponds to the embodiment according to FIG. 3 and 4.
  • the insert 20 extends not to the top of the burner shaft, but ends at a certain distance from it, being inner cavity 22 is closed at the top.
  • Above the Insert 20 is another between the wall sections 15a and 15b, downwardly closed insert 40 arranged, wherein between the lower end of the insert 40 and the upper end of the Insert 20 a passage 42 remains free.
  • This passage serves in same as the pipes 30 and 32 of the transfer of hot exhaust gases in an upper area of the distribution channel 14 or the channels 12a to 12c, in which exhaust gases that do not cross the path have taken the channel 38, already by heat exchange with the Liquid in the steam boiler has already cooled down.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Detergent Compositions (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

The steam generator has a steam boiler (1), burner shaft (5) and heat exchange sector (10) with channels (12a, 12b, 12c) connected on one side to a chimney and on the other via a connecting sector to the burner shaft. The connecting sector has a through passage (25), formed by an aperture in one wall (15a, 15b) of the burner shaft and an insert (20). The aperture connects the burner shaft to one or more of the channels of the heat exchange sector, and is partly closed by the insert (20).

Description

Die Erfindung betrifft einen Dampferzeuger gemäß des Oberbegriffs des Patentanspruchs 1.The invention relates to a steam generator according to the preamble of patent claim 1.

Aus dem Stand der Technik sind verschiedene Dampferzeuger bekannt.Various steam generators are known from the prior art.

Aus der DE 295 00 595.5 ist ein Dampferzeuger für ein Gargerät bekannt, bei dem ein Brennerschacht mit Kanälen für einen Wärmetausch über einen einfachen Querschacht konstanten Querschnitts verbunden ist, der in einem Dampfkessel ausgebildet ist. Diese Konstruktionsweise ist aufwendig und führt nicht zu einer optimalen Umleitung der Abgase eines Brenners, die in den Brennerschacht eingeleitet werden, zu den Kanälen des Wärmetauscherabschnitts. Insbesondere ist bei der Verwendung verschiedener Brenner nicht sichergestellt, daß immer eine gleichmäßige Verteilung der Abgase auf die Kanäle und damit ein gleichmäßiger Wärmeaustausch sichergestellt ist.From DE 295 00 595.5 a steam generator for a cooking device is known, in which a burner shaft with channels for heat exchange via a simple transverse shaft Cross-section is connected, which is formed in a steam boiler. This way of construction is complex and does not lead to an optimal diversion of the exhaust gases of a burner, which are introduced into the burner shaft, to the channels of the heat exchanger section. In particular, when using different burners it is not guaranteed that always an even distribution of the exhaust gases on the ducts and thus an even heat exchange is ensured.

Ferner ist aus der DE 28 07 166 ein gattungsgemäßer Dampferzeuger bekannt. In diesem Dampferzeuger fließen Abgase eines Brenners aus einem Flammrohr, in welchem sich der Brenner befindet, über eine Endverbrennungskammer, in Rauchrohre. Die Rauchrohre verlaufen durch eine Dampftrommel, in welcher es zu einem Wärmeaustausch zwischen den durch die Rauchrohre fließenden Abgasen und einem in der Dampftrommel befindlichen Kesselfluid kommt. Nachteilig bei diesem Dampferzeuger ist jedoch, daß er ebenfalls nicht auf konstruktiv einfache Art an verschiedene Abgasströme, insbesondere bei der Verwendung verschiedener Brenner, angepaßt werden kann, um eine gleichmäßige Verteilung der Abgase auf die Rauchrohre zu erzielen. Furthermore, a generic steam generator is known from DE 28 07 166. In this Steam generators flow exhaust gases from a burner from a flame tube in which the The burner is located in smoke pipes via a final combustion chamber. The smoke pipes run through a steam drum, in which there is a heat exchange between the the flue gases flowing and a boiler fluid in the steam drum comes. A disadvantage of this steam generator, however, is that it is also not constructive simple type to different exhaust gas flows, especially when using different Burner, can be adjusted to ensure an even distribution of exhaust gases to achieve the flue pipes.

Es ist Aufgabe der vorliegenden Erfindung, den gattungsgemäßen Dampferzeuger derart weiterzuentwickeln, daß die Nachteile des Stands der Technik überwunden werden. Dabei soll ein Dampferzeuger geschaffen werden, bei dem die Überleitung von Gasströmung von dem Brenner zu Kanälen eines Wärmetauscherabschnitts mit einfachen Mitteln eine Optimierung der Strömungsverhältnisse in dem oder den Kanälen des Wärmetauscherabschnitts ermöglicht, selbst ohne eine neue Auslegung und Neukonstruktion der Einbauten des Dampferzeugers eine Anpassung an verschiedene Strömungsverhältnisse, wie bei dem Einsatz verschiedener Brenner, möglich ist.It is an object of the present invention, the generic steam generator such to develop further that the disadvantages of the prior art are overcome. there a steam generator is to be created in which the transfer of gas flow from the burner to channels of a heat exchanger section with simple means an optimization which allows flow conditions in the channel or channels of the heat exchanger section, even without a new design and redesign of the internals of the steam generator an adaptation to different flow conditions, such as when using different Burner, is possible.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des kennzeichnenden Teils des Patentanspruchs 1 gelöst.According to the invention, this object is achieved by the features of the characterizing part of the Claim 1 solved.

Diese erfindungsgemäße Ausführung der Verbindung zwischen dem Einsatz und der Wand des Brennerschachts ermöglicht es, die Strömungsverhältnisse im Inneren des Dampferzeugers auf eine einfache Weise bei der Produktion des Dampferzeugers zu optimieren. In dem erfindungsgemäßen Dampferzeuger wird der Einsatz nach Art eines Schiebers auf die Wand des Brennerschachts aufgesteckt. Insbesondere die Verwendung eines Einsatzes mit A- oder H-förmigen Querschnitt ermöglicht ein leichtes Aufstecken des Einsatzes. Durch die Verwendung verschieden langer Einsätze kann der Querschnitt des Durchlasses auf einfache Weise eingestellt und dadurch die Strömung zu dem oder den Kanälen des Wärmetauscherabschnitts beeinflußt werden. Somit wird insbesondere bei der Verwendung von verschiedenen Brenner in dem erfindungsgemäßen Dampferzeuger vermieden, daß die sonstigen Einbauten des Dampferzeugers an die Brenner angepaßt werden müssen. Dies führt zu einer enormen Kosten- und Zeitersparnis während der Produktion des erfindungsgemäßen Dampferzeugers, da nur Einsätze unterschiedlicher Länge vorgehalten werden müssen und ansonsten der Dampferzeuger mit identischen geometrischen Abmessungen produziert werden kann und für alle Brenner ein effektiver Wärmeaustausch sichergestellt ist.This inventive design of the connection between the insert and the wall The burner shaft enables the flow conditions inside the steam generator in a simple way to optimize the production of the steam generator. By doing Steam generator according to the invention is used in the manner of a slide on the wall of the burner shaft. In particular, the use of an insert with A or H-shaped cross-section enables easy insertion of the insert. By using it The cross section of the passage can be of different lengths in simple Set way and thereby the flow to the channel or channels of the heat exchanger section to be influenced. Thus, especially when using different Burner in the steam generator according to the invention avoided that the other internals of the steam generator must be adapted to the burner. This leads to an enormous Cost and time savings during the production of the steam generator according to the invention, since only inserts of different lengths have to be kept and otherwise the Steam generator can be produced with identical geometric dimensions and for all burners an effective heat exchange is ensured.

Die Patentansprüche 2 bis 10 kennzeichnen besonders vorteilhafte Ausführungsformen des erfindungsgemäßen Dampferzeugers.The claims 2 to 10 characterize particularly advantageous embodiments of the steam generator according to the invention.

Dabei kann der Einsatz insbesondere einen Strömungsbypass bilden, der es gestattet, heiße Abgase in einen Bereich der Kanäle des Wärmetauschers zu leiten, in dem die Abgase bereits abgekühlt sind und in dem ansonsten nur noch ein geringer Wärmeaustausch stattfinden würde, oder der Durchlaß kann als Drossel ausgebildet sein, wobei das hindurchtretende Gas nach dem Durchtritt auf der Seite des Wärmetauscherabschnitts entspannt wird.The insert can in particular form a flow bypass, which allows hot Exhaust gases in an area of the channels of the heat exchanger in which the exhaust gases are already cooled down and in which otherwise only a small heat exchange would take place, or the passage can be designed as a throttle, the gas passing through after the passage on the side of the heat exchanger section is relaxed.

Erfindungsgemäß wird somit die Verbindung des Brennerschachtes mit dem Strömungssystem des Wärmetauscherabschnitts auf einfache und elegante Art gelöst, wobei sich gleichzeitig die Strömungsverhältnisse in dem Durchlaß durch die Wahl einer bestimmten Form des Einsatzes während der Produktion des Dampferzeugers so beeinflussen lassen, daß eine optimale Verteilung des Abgasstroms auf die Kanäle für den Wärmeaustausch entsteht. Insbesondere kann der Querschnitt des Durchlasses zwischen dem Brennerschacht und dem Wärmetauscherabschnitt so eingestellt werden, daß der Anteil des Gasstroms, welcher zu den von dem Brennerschacht weiter entfernten Kanälen in dem Wärmetauscherabschnitt strömt, vergrößert wird und damit die Verteilung des Gasstroms auf die Kanäle des Wärmetauscherabschnitts vergleichmäßigt wird. Da der Einsatz unabhängig von dem Dampfkessel und dem Brennerschacht herstellbar ist, können weitere strömungsleitende oder -begrenzende Maßnahmen durch eine entsprechende Formgebung des Einsatzes in einfacher Weise realisiert werden.According to the invention, the connection of the burner shaft with the flow system of the heat exchanger section solved in a simple and elegant way, while at the same time the flow conditions in the passage through the choice of a particular shape of the Use during the production of the steam generator so that an optimal Distribution of the exhaust gas flow to the channels for heat exchange occurs. In particular can the cross section of the passage between the burner shaft and the heat exchanger section can be set so that the proportion of the gas flow which to that of channels in the heat exchanger section which are further away from the burner shaft are enlarged and thus the distribution of the gas flow to the channels of the heat exchanger section is evened out. Since the use is independent of the steam boiler and the Burner shaft can be produced, other flow-guiding or limiting measures realized in a simple manner by appropriate shaping of the insert become.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden detaillierten Beschreibung von Ausführungsbeispielen der Erfindung mit Bezug auf die beigefügten Zeichnungen.

Fig. 1
zeigt einen Längsschnitt eines erfindungsgemäßen Dampferzeugers.
Fig. 2
zeigt eine Draufsicht des Dampferzeugers gemäß Fig. 1.
Fig. 3
zeigt einen Längsschnitt einer zweiten Ausführungsform des erfindungsgemäßen Dampferzeugers.
Fig. 4
zeigt eine Draufsicht des Dampferzeugers gemäß Fig. 3.
Fig. 5
zeigt einen Längsschnitt einer dritten Ausführungsform des erfindungsgemäßen Dampferzeugers.
Fig. 6
zeigt eine Draufsicht des Dampferzeugers gemäß Fig. 5.
Fig. 7
zeigt einen Längsschnitt einer vierten Ausführungsform der Erfindung
Fig. 8
zeigt eine Draufsicht des Dampferzeugers gemäß Fig. 7.
Further features and advantages of the invention will become apparent from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings.
Fig. 1
shows a longitudinal section of a steam generator according to the invention.
Fig. 2
shows a top view of the steam generator according to FIG. 1.
Fig. 3
shows a longitudinal section of a second embodiment of the steam generator according to the invention.
Fig. 4
shows a top view of the steam generator according to FIG. 3.
Fig. 5
shows a longitudinal section of a third embodiment of the steam generator according to the invention.
Fig. 6
shows a plan view of the steam generator according to FIG. 5.
Fig. 7
shows a longitudinal section of a fourth embodiment of the invention
Fig. 8
shows a top view of the steam generator according to FIG. 7.

Bei der Ausführungsform gemäß Fig. 1 und 2 weist der Dampferzeuger einen mit Wasser gefüllten Dampfkessel 1 mit einem Auslaß 3 auf, über den Dampf entnommen werden kann. Der Wasserstand in dem Dampfkessel ist durch schraffierte Linien angedeutet. In dem Dampfkessel ist ein Brennerschacht 5 ausgebildet, in den über ein Überhitzungsschutzrohr 7 die Abgase eines Gasbrenners (nicht dargestellt) eingeleitet werden. Diese Abgase werden zu einem Wärmetauscherabschnitt 10 geleitet, welcher mehrere Kanäle 12a, 12b unc 12c aufweist, die von einem Verteilerkanal 14 abzweigen und durch welche die Abgase des Brenners zu einem Abzug (nicht dargestellt) geleitet werden. Über die Wände der Kanäle 12a, 12b, 12c und 14 vollziehen die Abgase einen Wärmeaustausch mit dem Wasser in dem Dampfkessel. Der Verteilerkanal 14 mündet ebenfalls in den Abzug.In the embodiment according to FIGS. 1 and 2, the steam generator a steam boiler 1 filled with water with an outlet 3, through which steam can be removed. The water level in the Steam boiler is indicated by hatched lines. By doing Steam boiler, a burner shaft 5 is formed, in the over a Overheating protection tube 7 the exhaust gases of a gas burner (not shown) be initiated. These exhaust gases become a heat exchanger section 10 passed, which a plurality of channels 12a, 12b unc 12c, which branch off from a distribution channel 14 and through which the flue gases of the burner to a fume cupboard be directed. Over the walls of channels 12a, 12b, 12c and 14 the exhaust gases exchange heat with the water in the Steam boiler. The distribution channel 14 also opens into the fume cupboard.

Zwischen dem Brennerschacht 5 und dem Verteilerkanal 14 befindet sich eine nach oben hin offene Öffnung zwischen den Wandabschnitten 15a und 15b des Brennerschachts 5. In dieser Öffnung ist ein H-förmiger Einsatz 20 eingesetzt, wobei jeweils zwei parallele Flansche des Einsatzes die beiden Wandabschnitte 15a und 15b nach Art einer Nut umgreifen, so daß der Einsatz durch Aufstecken und Verschieben montiert werden kann. Der Einsatz 20 dient als Drosselschacht und weist einen nach oben verschlossenen Hohlraum 22 auf. Der Einsatz 20 ragt nach unten über den unteren Ansatz der Kanäle 12a bis 12c vor und bildet zusammen mit den Wandabschnitten 15a und 15b sowie dem Boden der Öffnung zwischen diesen Wandabschnitten einen Durchlaß 25 und somit eine Strömungsbegrenzung für den von dem Brennerschacht kommenden Gasstrom. Wie aus Fig. 1 ersichtlich ist, erstreckt sich der Verteilerkanal 14 in einem unteren Bereich unter die Seitenkanäle 12a, 12b und 12c, so daß ein Umlenkabschnitt mit einem größeren Querschnitt als demjenigen des Durchlasses 25 gebildet wird. Durch Verschieben des Einsatzes 20 kann der Querschnitt des Durchlasses 25, welcher den Übergang von dem Brennerschacht 5 zu dem Wärmetauscherabschnitt 10 bildet, so eingestellt werden, daß besonders günstige Strömungsverhältnisse und ein optimaler Wärmeübergang gewährleistet werden. Für den Betrieb wird dieser Querschnitt durch Fixieren des Einsatzes 20 konstant gehalten.Is located between the burner shaft 5 and the distribution channel 14 there is an upward opening between the wall sections 15a and 15b of the burner shaft 5. In this opening is a H-shaped insert 20 used, two parallel each Flanges the insert after the two wall sections 15a and 15b Grasp kind of a groove, so that the insert by plugging and Moving can be assembled. The insert 20 serves as a throttle shaft and has an upwardly closed cavity 22 on. The insert 20 projects down over the lower neck of the Channels 12a to 12c and forms together with the wall sections 15a and 15b and the bottom of the opening between them Wall sections a passage 25 and thus a flow restriction for the gas stream coming from the burner shaft. How from 1, the distribution channel 14 extends in a lower area under the side channels 12a, 12b and 12c, see above that a deflection section with a larger cross section than that of the passage 25 is formed. By moving the insert 20 can the cross section of the passage 25, which the Transition from the burner shaft 5 to the heat exchanger section 10 forms, are set so that particularly favorable flow conditions and an optimal heat transfer can be guaranteed. This cross-section is used for operation by fixing the insert 20 kept constant.

Die Brennkammer des Gasbrenners geht vorzugsweise unmittelbar in das Überhitzungsschutzrohr 7 über, das z.B. aus Stahl bestehen kann. Das Überhitzungsschutzrohr 7 leitet die Abgase des Brenners auf ein Niveau unterhalb des Wasserpegels in dem Dampferzeuger 1 und vorzugsweise bis ungefähr auf die Höhe des Ansatzes der Kanäle 12a bis 12c. Auf diese Weise wird vermieden, daß die heißen Abgase des Brenners mit einem nicht gekühlten Wandabschnitt des Brennerschachtes 5 oberhalb des Wasserpegels in Kontakt kommen und dort eine Überhitzung verursachen. Typischerweise ist das Überhitzungsschutzrohr Teil der Brennkammer des Brenners.The combustion chamber of the gas burner preferably goes directly into the overheating protection tube 7, which e.g. are made of steel can. The overheating protection tube 7 conducts the exhaust gases of the burner to a level below the water level in the steam generator 1 and preferably up to approximately the level of the approach of the channels 12a to 12c. In this way it is avoided that the hot exhaust gases of the burner with a non-cooled wall section of the burner shaft 5 come in contact above the water level and there cause overheating. Typically the overheat protection tube Part of the burner's combustion chamber.

Die aus dem Überhitzungsschutzrohr 7 austretenden Abgase des Brenners werden um 180° zu den Kanälen 12a, 12b, 12c und 14 umgeleitet und treten über den Durchlaß 25 des Verbindungsabschnittes in den Wärmetauscherabschnitt 10 ein. Aufgrund des geringeren Querschnitts des Durchlasses 25 erhält der Gasstrom eine stärkere Impulskomponente quer zur ursprünglichen Strömungsrichtung, was dazu führt, daß auch der radial weiter außen gelegene Strömungskanal 12a einen ausreichenden Anteil des Gasstroms erhält. Die Abgase strömen dann - in umgekehrter Richtung wie in dem Brennerschacht 5 - in den Kanälen 12a, 12b, 12c und 14 zu dem Abzug und geben dabei wärme an die Flüssigkeit in dem Dampfkessel 1 ab.The exiting from the overheating protection tube 7 Brenners are diverted by 180 ° to the channels 12a, 12b, 12c and 14 and pass through the passage 25 of the connecting portion into the heat exchanger section 10. Because of the lesser Cross section of the passage 25, the gas flow receives a stronger Pulse component transverse to the original flow direction what leads to the fact that the radially outer flow channel 12a receives a sufficient proportion of the gas flow. The Exhaust gases then flow - in the opposite direction as in the burner shaft 5 - in channels 12a, 12b, 12c and 14 to the trigger and give off heat to the liquid in the steam boiler 1.

Bei der in Fig. 3 und Fig. 4 dargestellten Ausführungsform der Erfindung weist der Einsatz 20 zusätzliche Rohrabschnitte 30 und 32 auf, welche den Verteilerkanal 14 mit dem inneren Hohlraum 22 des Einsatzes 20 verbinden. Der Innenraum des Einsatzes 20 bildet damit eine nicht gekühlte Bypass-Strecke für einen Teil der heißen Abgase, die aus dem Brennerschacht 5 kommen und speist diese heissen Abgase an Stellen der Kanäle 12a bis 12c ein, an denen diejenigen Abgase, welche nicht den Weg über den Einsatz 20 genommen haben, bereits abgekühlt sind. Damit wird eine Vergleichmäßigung des Wärmeübergangs in axialer Richtung bewirkt. Da die heißen Abgase.im Bereich des Durchlasses 25 unter einem höheren Druck stehen, als die bereits abgekühlten Abgase in den Kanälen 12a bis 12c auf der Höhe der Rohrverbindungen 30 und 32, entsteht im Bereich des Durchlasses 25 ein Sog in den Schacht 22 hinein, der die Bypassströmung durch diesen Schacht hindurch fördert.In the embodiment of FIGS. 3 and 4 Invention has the insert 20 additional pipe sections 30 and 32 on which the distribution channel 14 with the inner cavity 22nd connect the insert 20. The interior of the insert 20 forms thus an uncooled bypass section for part of the hot Exhaust gases that come from the burner shaft 5 and feed them hot Exhaust gases at locations of channels 12a to 12c where those Exhaust gases that have not been routed via insert 20 have already cooled down. This is a leveling out the heat transfer in the axial direction. Since the hot exhaust gases Area of the passage 25 are under a higher pressure, than the already cooled exhaust gases in the channels 12a to 12c at the level of the pipe connections 30 and 32, arises in the area of the passage 25 a suction into the shaft 22, the bypass flow through this shaft.

Die in den Fig. 5 und 6 dargestellte Ausführungsform der Erfindung entspricht im wesentlichen der Ausführungsform gemäß den Fig. 3 und 4. Hier sind jedoch zwei symmetrisch angeordnete und gleich aufgebaute Wärmetauscherabschnitte 110a und 110b vorgesehen, welche jeweils Wärmetauscherkanäle 112a bis 112c bzw. 112e bis 112f und Verteilerkanäle 114a und 114b aufweisen. Jedem Wärmetauscherabschnitt ist ein hohler Einsatz 120a bzw. 120b zugeordnet, der im Bereich des Verbindungsabschnitts mit der Brennkammer 3 einen Durchlaß 125a bzw. 125b begrenzt und Rohre 130a und 130a bzw. 132b und 132b aufweist, mit denen heiße Abgase an eine weiter oben gelegene Stelle der Verteilerschächte 114a und 114b eingespeist werden können. Die Konstruktionsweise entspricht im wesentlichen derjenigen der Ausführungsform Fig. 3 und 4; auf eine detaillierte Beschreibung der einzelnen Elemente wird daher verzichtet. Selbstverständlich können über die beiden in Fig. 5 und Fig. 6 dargestellten Wärmetauscherabschnitte hinaus auch noch weitere Wärmetauscherabschnitte vorgesehen sein, die beispielsweise entlang einer Achse senkrecht zu der Verbindungsachse zwischen den Wärmetauscherabschnitten 110a und 110b angeordnet sein können. Auch andere beispielsweise ring- oder polygonförmige Anordnungen von Wärmetauscherabschnitten sind möglich. Ebenso können auch mehrere Wärmetauscher gemäß Fig. 1 untereinander oder mit Wärmetauschern gemäß Fig. 3 kombiniert sein.The embodiment of the invention shown in FIGS. 5 and 6 essentially corresponds to the embodiment according to FIG. 3 and 4. However, here are two symmetrically arranged and the same constructed heat exchanger sections 110a and 110b are provided, which heat exchanger channels 112a to 112c and 112e to 112f, respectively and have distribution channels 114a and 114b. Every heat exchanger section is associated with a hollow insert 120a or 120b, which in the Area of the connecting section with the combustion chamber 3 a Passage 125a and 125b limited and pipes 130a and 130a and 132b and 132b with which hot exhaust gases are passed to a higher one In place of the distribution shafts 114a and 114b can. The construction corresponds essentially to that the embodiment of Figures 3 and 4; on a detailed A description of the individual elements is therefore omitted. Of course can about the two shown in Fig. 5 and Fig. 6 Heat exchanger sections also other heat exchanger sections be provided along for example an axis perpendicular to the connection axis between the heat exchanger sections 110a and 110b can be arranged. Others too for example ring or polygonal arrangements of Heat exchanger sections are possible. Likewise, several can 1 with each other or with heat exchangers 3 can be combined.

Die in den Fig. 7 und 8 dargestellte Ausführungsform der Erfindung entspricht im wesentlichen der Ausführungsform gemäß den Fig. 3 und 4. Hierbei ist jedoch das das Überhitzungsschutzrohr 7 umgebende obere Ende des Brennerschachts 5 nach oben hin abgeschlossen, so daß zwischen dem Überhitzungsschutzrohr und dem Einsatz 20 ein weiterer Strömungskanal 38 gebildet wird. Der Einsatz 20 erstreckt sich nicht bis zu dem oberen Ende des Brennerschachts hin, sondern endet in einem gewissen Abstand von demselben, wobei sein innerer Hohlraum 22 nach oben hin abgeschlossen ist. Oberhalb des Einsatzes 20 ist zwischen den Wandabschnitten 15a und 15b ein weiterer, nach unten hin geschlossener Einsatz 40 angeordnet, wobei zwischen dem unteren Ende des Einsatzes 40 und dem oberen Ende des Einsatzes 20 ein Durchlaß 42 freibleibt. Dieser Durchlaß dient in gleicher weise wie die Rohre 30 und 32 der Überleitung heißer Abgase in einen oberen Bereich des Verteilerkanals 14 bzw. der Kanale 12a bis 12c, in dem diejenigen Abgase, die nicht den Weg uber den Kanal 38 genommen haben, bereits durch Wärmeaustausch mit der Flüssigkeit in dem Dampfkessel bereits abgekühlt sind.The embodiment of the invention shown in FIGS. 7 and 8 essentially corresponds to the embodiment according to FIG. 3 and 4. Here, however, is the one surrounding the overheating protection tube 7 upper end of the burner shaft 5 closed at the top, so that between the overheating protection tube and the insert 20th a further flow channel 38 is formed. The insert 20 extends not to the top of the burner shaft, but ends at a certain distance from it, being inner cavity 22 is closed at the top. Above the Insert 20 is another between the wall sections 15a and 15b, downwardly closed insert 40 arranged, wherein between the lower end of the insert 40 and the upper end of the Insert 20 a passage 42 remains free. This passage serves in same as the pipes 30 and 32 of the transfer of hot exhaust gases in an upper area of the distribution channel 14 or the channels 12a to 12c, in which exhaust gases that do not cross the path have taken the channel 38, already by heat exchange with the Liquid in the steam boiler has already cooled down.

Die in der vorangehenden Beschreibung, den Ansprüchen und der Zeichnung offenbarten Merkmale der Erfindung können sowohl einzeln als auch in beliebiger Kombination für die Verwirklichung der Erfindung in ihren verschiedenen Ausführungsformen wesentlich sein.The in the preceding description, the claims and the Drawing disclosed features of the invention can be both individually as well as in any combination for realizing the invention be essential in their various embodiments.

Claims (10)

  1. A steam generator, particularly for use in kitchen technology, comprising a steam boiler (1), a burner shaft (5) for supplying hot waste gases from a burner, and at least one heat-exchanger section (10) with one or more ducts (12a, 12b, 12c) for the passage of the burner waste gases and for heat exchange with the liquid contained in the steam boiler (1), wherein the duct or ducts (12a, 12b, 12c) of the heat-exchanger section (10) is/are connected on the one hand to a flue and on the other hand via a connecting section to the burner shaft (5) and are so disposed that the direction of flow of the gases flowing from the burner to the flue in the duct or ducts (12a, 12b, 12c) is different from the direction of flow in the burner shaft (5), the connecting section comprises a passage (25) formed by an opening in a wall (15a, 15b) of the burner shaft (5) and an insert (20), and the opening is partially closed by the insert (20), characterised in that the insert (20) is connected to the wall (15a, 15b) of the burner shaft (5) after the style of a tongue and groove connection.
  2. A steam generator according to claim 1, characterised in that the opening in a side wall has an orifice on the entry side into the burner shaft (5) of the gases coming from the burner.
  3. A steam generator according to claim 1 or 2, characterised in that the insert (20) has in its interior a cavity (22) with an opening leading into the passage (25).
  4. A steam generator according to claim 3, characterised in that the cavity has at least one other opening (30, 32) which is connected to one or more ducts (12a, 12b, 12c) of the heat-exchanger section (10) at a place downstream of the passage (25) so that a part of the flow path is bridged in the duct or ducts (12a, 12b, 12c).
  5. A steam generator according to any one of claims 1 to 4, characterised in that the heat-exchanger section (10) comprises a distributor duct (14) which adjoins the passage (25) downstream, a plurality of side ducts (12a, 12b, 12c) branching off said distributor duct (14).
  6. A steam generator according to claim 5, characterised by a deflecting device disposed between the passage (25) and the side ducts (12a, 12b, 12c) for deflecting the waste gases from the passage (25) into the longitudinal direction of the side ducts (12a, 12b, 12c).
  7. A steam generator according to any one of claims 1 to 6, characterised in that it comprises a plurality of heat-exchanger sections (110a, 110b), the flow systems of which for the burner waste gases are each connected to the burner shaft (5) via a passage (125a, 125b) in a wall of the burner shaft.
  8. A steam generator according to any one of claims 1 to 7, characterised by an overheating protection tube (7) in the burner shaft (5) for introducing the burner waste gases into the burner shaft (5) below the level of the liquid in the steam boiler (1).
  9. A steam generator according to claim 8, characterised in that the opening of the overheating protection tube (7) is situated just above the level of the passage or passages (25; 125a, 125b) which connect the burner (5) to the flow system of the heat-exchanger section or sections (10; 110a, 110b).
  10. A steam generator according to claim 8 or 9, characterised in that a transfer duct (38) is formed between the walls of the burner shaft (5) and the overheating protection tube (7) and the insert (20, 40) comprises a second passage (42) which leads into the transfer duct (38) and which connects one or more ducts (12a, 12b, 12c, 14) of a heat-exchanger section to the transfer duct (38) at a place downstream of the first passage (25) so that a part of the flow path is bridged from the first passage (25) to the flue through the ducts (12a, 12b, 12c, 14), the first passage (28) being formed outside the transfer duct (38).
EP97120542A 1997-02-28 1997-11-24 Steam generator Expired - Lifetime EP0863365B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19708229 1997-02-28
DE19708229A DE19708229C2 (en) 1997-02-28 1997-02-28 Steam generator

Publications (3)

Publication Number Publication Date
EP0863365A2 EP0863365A2 (en) 1998-09-09
EP0863365A3 EP0863365A3 (en) 2000-08-02
EP0863365B1 true EP0863365B1 (en) 2002-10-16

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ID=7821879

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Application Number Title Priority Date Filing Date
EP97120542A Expired - Lifetime EP0863365B1 (en) 1997-02-28 1997-11-24 Steam generator

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US (1) US6076518A (en)
EP (1) EP0863365B1 (en)
JP (1) JP3527841B2 (en)
AT (1) ATE226296T1 (en)
DE (2) DE19708229C2 (en)
DK (1) DK0863365T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3701797A1 (en) 2019-02-26 2020-09-02 Electrolux Professional S.p.A. Oven comprising a steam generator

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US6269580B1 (en) * 1998-10-14 2001-08-07 Asahi Kogaku Kogyo Kabushiki Kaisha Motor-driven focusing apparatus of a sighting telescope
DE10315818B4 (en) * 2003-04-07 2005-10-06 Rational Ag Steam generator with reduced limescale
BRPI0721858B1 (en) * 2007-07-05 2019-04-30 Ib, Ntec CLOSED CIRCUIT THERMODYNAMIC SYSTEM
US7823544B2 (en) * 2008-01-04 2010-11-02 Ecr International, Inc. Steam boiler
US9103603B2 (en) * 2009-10-28 2015-08-11 Tai-Her Yang Thermal conductive cylinder installed with U-type core piping and loop piping
US9546798B2 (en) * 2011-10-10 2017-01-17 Intellihot Green Technologies, Inc. Combined gas-water tube hybrid heat exchanger
RU2506493C2 (en) * 2012-02-07 2014-02-10 Федеральное государственное военное образовательное учреждение высшего профессионального образования Военная академия Ракетных войск стратегического назначения имени Петра Великого МО РФ Steam generation method

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US608291A (en) * 1898-08-02 Water-heater
BE630357A (en) * 1962-01-30
US4178880A (en) * 1976-11-11 1979-12-18 Nils Ostbo Furnace
DE2807166A1 (en) * 1978-02-20 1979-08-23 Nils Oestbo Steam or hot water boiler - has annular drum traversed by two concentric sets of fire tubes in series
IT235007Y1 (en) * 1994-01-17 2000-03-31 Zanussi Grandi Impianti Spa COOKING OVEN WITH STEAM GENERATOR WITH BLOWN BURNER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3701797A1 (en) 2019-02-26 2020-09-02 Electrolux Professional S.p.A. Oven comprising a steam generator

Also Published As

Publication number Publication date
ATE226296T1 (en) 2002-11-15
EP0863365A2 (en) 1998-09-09
US6076518A (en) 2000-06-20
EP0863365A3 (en) 2000-08-02
JP3527841B2 (en) 2004-05-17
DE19708229A1 (en) 1998-09-10
DE19708229C2 (en) 1999-01-21
JPH1182904A (en) 1999-03-26
DK0863365T3 (en) 2003-02-17
DE59708490D1 (en) 2002-11-21

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