EP0980496A1 - Continuous steam generator - Google Patents

Continuous steam generator

Info

Publication number
EP0980496A1
EP0980496A1 EP98932012A EP98932012A EP0980496A1 EP 0980496 A1 EP0980496 A1 EP 0980496A1 EP 98932012 A EP98932012 A EP 98932012A EP 98932012 A EP98932012 A EP 98932012A EP 0980496 A1 EP0980496 A1 EP 0980496A1
Authority
EP
European Patent Office
Prior art keywords
steam generator
combustion chamber
rear wall
flow
tubes
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.)
Granted
Application number
EP98932012A
Other languages
German (de)
French (fr)
Other versions
EP0980496B1 (en
Inventor
Eberhard Wittchow
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0980496A1 publication Critical patent/EP0980496A1/en
Application granted granted Critical
Publication of EP0980496B1 publication Critical patent/EP0980496B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00—Steam boilers of forced-flow type
    • F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00—Steam boilers of forced-flow type
    • F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
    • F22B29/061—Construction of tube walls
    • F22B29/062—Construction of tube walls involving vertically-disposed water tubes

Definitions

  • the invention relates to a continuous-flow steam generator in a two-pass design with a combustion chamber rear wall of the first vertical train, which is inclined inwards towards the combustion chamber in an upper partial region and thereby forms a "nose" into the combustion chamber with the bottom of the adjacent horizontal gas train.
  • a nose in the upper one part of the combustion chamber rear wall during the transition into the horizontal serves egg ner • improvement of flue gas distribution system.
  • the object of the invention is to make the suspension of the combustion chamber rear wall, that is to say quite generally, its fixation in the supporting structure above the pressure part of the steam generator inexpensively and to carry it out reliably.
  • the solution to this problem is set out in claim 1.
  • the essential structural elements of the suspension of the combustion chamber rear wall are flow generator tubes through which the flow medium flows, which in this respect have a dual function.
  • the supporting tubes are flowed through by a partial flow of the flow medium, which m
  • the support tubes are evenly distributed over the width of the combustion chamber rear wall.
  • the support tubes are evenly distributed over the width of the combustion chamber rear wall.
  • all the steam generator tubes leading to the inclined partial region of the combustion chamber rear wall below the inclined partial region of the combustion chamber rear wall m the compensating collector which runs approximately horizontally on its side facing away from the combustion chamber.
  • the steam generator tubes used as support tubes according to the invention are connected to the compensation header by flow only by pressure compensation tubes.
  • this equalization collector effects an even flow distribution within the combustion chamber rear wall as well as in the tubes of the upper, inclined partial area.
  • a partial enthalpy compensation of the flow medium flowing through it takes place in the compensation collector. This enthalpy compensation has a favorable effect on the temperature distribution m of the downstream, inclined heating surface, which forms the lower flank of the nose of the generic type.
  • FIG. 2 shows a perspective view of the transition of the lower section of the combustion chamber rear wall into its inclined upper section in the direction of view from the interior of the combustion chamber to the outside and with the omission of the connecting webs which are present for the heating gas flow between the steam generator tubes and are welded to said gas-tight.
  • FIG. 3 shows a representation analogous to FIG. 2 looking from the outside towards the interior of the combustion chamber.
  • FIGS. 3 and 5 shows a vertical cross section through the compensating collector and through the transition from the lower to the upper inclined partial region of the combustion chamber rear wall in accordance with the section line IV-IV in FIGS. 3 and 5.
  • FIG. 5 shows a sectional and side view of the transition of the lower section of the combustion chamber rear wall into the upper, inclined section corresponding to FIG
  • FIGS. 4 and 5 shows a plan view of the said transition area and additionally of the compensation collector in accordance with the arrow directions VI in FIGS. 4 and 5.
  • the continuous steam generator according to the invention is of the two-pass type. This means that in the passage direction 1 to 3 of the heating gases, a first vertical gas train 4 with ascending heating gas flow, a horizontal gas train 5 and a second vertical throttle cable 6 with descending heating gas guidance are arranged in a row.
  • a two-pass type steam generator essentially has the advantage of low overall external dimensions with other properties not mentioned here.
  • the constructional design and suspension of the rear wall 7 of the combustion chamber 8 of the first vertical gas flue 4 are essentially of interest.
  • This rear wall 7 is formed by an evaporator heating surface, which essentially consists of ascending and gas-tight connection to one another and for the flow through one Flow medium connected in parallel steam generator tubes 9.
  • These tubes are shown in the drawings with the inclusion of open spaces, but in practice are sealed gas-tight in a manner not shown here. As a result, they form an impermeable surrounding wall for the individual gas flues.
  • the combustion chamber rear wall 7 is the peripheral wall of the first vertical gas flue 4 facing the second vertical gas flue 6 and is oriented substantially vertically. Fossil fuel is supplied to the combustion chamber 8 from the outside by burners 10. When it is burned, the heating gas flowing through gas flues 4 to 6 is produced.
  • steam generator tubes 9 - additionally marked C in the drawings - differ from the other steam generator tubes marked A in that, with the further function as support tubes C of the combustion chamber rear wall 7, they are inclined upward to one outside the heating gas duct Outlet collector 15 are guided and lead there into this.
  • This outlet manifold 15 is part of a supporting structure 24, which is shown in its constructive configuration not in more detail but only with regard to the positioning of its steam generator tube 9C, which is led out upward at an incline into the area outside the heating gas duct with the reference number 24.
  • the outlet header 15 is located above the boiler ceiling 23.
  • the tubes of the nose 13 merge into the tubes of the bottom 12 of the horizontal gas flue 5 and also open into a header. Both groups of pipes are flowed through in parallel on the water side and on the Pf side.
  • the steam generator tubes 9 provided with the additional function of a support tube C are evenly distributed over the combustion chamber rear wall 7. In the exemplary embodiment, about 25% of those integrated into the combustion chamber rear wall 7
  • the steam generator tubes 9 of the lower section 14 of the combustion chamber rear wall 7 are connected to one another in terms of flow on their side facing away from the combustion chamber 8 below the inclined section 11 by an approximately horizontally running compensating collector 16.
  • the steam generator tubes 9A leading to the inclined partial region 11 of the combustion chamber rear wall 7 are connected below their bends 17 by means of an inlet tube 18 and above an outlet tube 19 with the collector 16 in terms of flow. In the process, they flow into the crown area 20 of the collector 16 (inlet pipe 18) or are derived from the crown area 20 (outlet pipe 19).
  • In the steam generator tube 9A there is a separating disk 25 between the inlet tube 18 and the outlet tube 19, so that the entire flow medium flows out of the lower partial region 14 of the steam generator tube 9Am the collector 16.
  • the steam generator tubes 9 used as support tubes 9C according to the invention are spatially connected to the collector 16 only by m approximately the aquator area of the clear cross section of the equalizing cylinder 16 horizontally incoming pressure equalizing tubes 21.
  • the main flow of the flow medium flows directly from a steam generator tube 9 in the lower section m the support tube 9C.
  • Log area 20 is assigned to the horizontal discharge pipes 21 on the part of the support pipes 9C discharge pipes 22 with the same cross section as the other pipes, which are inclined in a straight line into the upper section 11 of the combustion chamber rear wall 7 and there, in addition to the other steam generator pipes 9A, function in the same way as a steam generator pipe take.
  • the inclined outlet pipes 22 are guided past the assigned support pipes 9C with a bend, so that they assume the same spacing position in the inclined upper section 11 as the support pipes 9C as steam generator pipes in the lower section 14.
  • Another embodiment dispenses with the upper outlet pipes 22 as steam generator pipes which are additionally effective in the inclined upper section 11. It then only steam generator tubes 9A inclined from the lower partial region 14 via the bends 17 are present in the upper inclined partial region 11 as steam generator tubes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

Disclosed is a continuous two-feed steam generator comprised of a first vertical feed gas pipe (4) with an gas up-flow hot gas tube. The inventive apparatus is characterized in that the back wall (7) of the combustion chamber is inclined inwards to form, together with the bottom (12) of the immediately contiguous horizontal feed gas pipe, a nose engaging into the combustion chamber (8). Some manifolds (9C) in the lower part (14) of the steam generator rear wall extend upwards with no inclination owing to their support function, up to a support structure (5) located outside the hot gas pipe.

Description

Beschreibung description

Durchlaufdampferzeuger in ZweizugbauartContinuous steam generator in two-pass design

Die Erfindung betrifft einen Durchlaufdampferzeuger in Zweizugbauart mit einer Brennkammer-Rückwand des ersten Vertikalzuges, die in einem oberen Teilbereich zur Brennkammer hin einwärts geneigt ist und dadurch mit dem Boden des angrenzenden Horizontalgaszuges eine in die Brennkammer hineinstellende „Nase" bildet. Eine solche Nase im oberen Teil der Brennkammer-Rückwand beim Übergang in den Horizontalgaszug dient ei- • ner Verbesserung der Rauchgasführung.The invention relates to a continuous-flow steam generator in a two-pass design with a combustion chamber rear wall of the first vertical train, which is inclined inwards towards the combustion chamber in an upper partial region and thereby forms a "nose" into the combustion chamber with the bottom of the adjacent horizontal gas train. Such a nose in the upper one part of the combustion chamber rear wall during the transition into the horizontal serves egg ner • improvement of flue gas distribution system.

Für die Aufhängung der Brennkammer-Rückwand wurde bisher meist eine gesonderte Teilheizfläche mit Eintritts- und Austrittssammler verwendet, um in den hauptsächlich mit Naßdampf durchströmten Tragrohren Stabilitätsprobleme und daraus möglicherweise resultierende Rohrreißer zu vermeiden. Diese Aufhängungskonstruktion ist sehr aufwendig. Ein weiterer Nach- teil besteht in der meist unterschiedlichen Temperatur der zu einer gesonderten Teilheizfläche zusammengefaßten Tragrohre und der Brennkammer-Seitenwände, wenn diese Heizflächen nicht parallel, sondern in der meist üblichen Weise hintereinander durchströmt werden. Vor allen Dingen treten beim Füllen eines noch heißen Durchlaufdampferzeugers mit kälterem Speisewasser vor dem Zünden der Brenner beträchtliche Temperaturdifferenzen zwischen den Tragrohren der Brennkammer-Rückwand und den Brennkammer-Seitenwänden auf, und diese können in Folge unzulässig hoher Wärmespannungen zu Rohrschäden führen. Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, die Aufhängung der Brennkammer-Rückwand, also ganz allgemein ihre Fixierung in der Tragkonstruktion oberhalb des Druckteils des Dampferzeugers kostengünstig zu gestalten und betriebssicher auszuführen. Die Lösung dieser Aufgabe ist in Anspruch 1 nie- dergelegt. Durch die Erfindung sind die wesentlichen Konstruktionselemente der Aufhangung der Brennkammer-Ruckwand vom Stromungsmedium durchströmte Dampferzeugerrohre, denen insoweit eine Doppelfunktion obliegt. Die Tragrohre sind dabei von einem Teilstrom des Stromungsmediums durchflössen, welcher mUp to now, a separate partial heating surface with inlet and outlet manifold has mostly been used to hang up the combustion chamber rear wall, in order to avoid stability problems and possibly resulting pipe cracks in the carrying tubes, which are mainly flowed through by wet steam. This suspension construction is very complex. A further disadvantage is the mostly different temperature of the support tubes combined to form a separate partial heating surface and the combustion chamber side walls if these heating surfaces are not flowed through in parallel but in the usually usual manner one behind the other. Above all, when filling a still hot once-through steam generator with colder feed water before igniting the burners, there are considerable temperature differences between the support pipes of the combustion chamber rear wall and the combustion chamber side walls, and these can lead to pipe damage as a result of inadmissibly high thermal stresses. Proceeding from this, the object of the invention is to make the suspension of the combustion chamber rear wall, that is to say quite generally, its fixation in the supporting structure above the pressure part of the steam generator inexpensively and to carry it out reliably. The solution to this problem is set out in claim 1. By means of the invention, the essential structural elements of the suspension of the combustion chamber rear wall are flow generator tubes through which the flow medium flows, which in this respect have a dual function. The supporting tubes are flowed through by a partial flow of the flow medium, which m

Durchstromrichtung jenseits der Tragkonstruktion wieder dem Hauptstrom des Stromungsmediums zugeführt wird.Flow direction beyond the supporting structure is fed back to the main flow of the flow medium.

Nach einer bevorzugten Ausfuhrungsform sind die Tragrohre gleichmäßig über die Breitenerstreckung der Brennkammer-Ruckwand verteilt. Für die erfmdungsgemaße Tragefunktion wird nur ein Teil - wesentlich weniger als die Hälfte - der die Brennkammer-Ruckwand bildenden Dampferzeugerrohre benotigt.According to a preferred embodiment, the support tubes are evenly distributed over the width of the combustion chamber rear wall. For the carrying function according to the invention, only a part - much less than half - of the steam generator tubes forming the combustion chamber rear wall is required.

Nach einer weiteren Ausgestaltung munden sämtliche zum geneigten Teilbereich der Brennkammer-R ckwand fuhrenden Dampferzeugerrohre unterhalb des geneigten Teilbereiches der Brennkammer-R ckwand m den auf ihrer der Brennkammer abgewandten Seite etwa horizontal verlaufenden Ausgleichsammler . Dagegen sind die als Tragrohre erfindungsgemaß verwendeten Dampferzeugerrohre nur durch Druckausgleichsrohre mit dem Ausgleichsammler stromungsmaßig verbunden. Dieser Ausgleichsammler bewirkt durch Druckausgleich eine gleichmäßige Stro- mungsverteilung innerhalb der Brennkammer-Ruckwand als auch in den Rohren des oberen geneigten Teilbereichs. Außerdem findet m dem Ausgleichsammler ein teilweiser Enthalpieaus- gleich des m ihm mundenden Stromungsmediums statt. Dieser Enthalpieausgleich wirkt sich g nstig auf die Temperaturverteilung m der stromungsmaßig nachgeschalteten, geneigten Heizfläche aus, die die untere Flanke der gattungsgemaß vorhandenen Nase bildet.According to a further embodiment, all the steam generator tubes leading to the inclined partial region of the combustion chamber rear wall below the inclined partial region of the combustion chamber rear wall m the compensating collector which runs approximately horizontally on its side facing away from the combustion chamber. In contrast, the steam generator tubes used as support tubes according to the invention are connected to the compensation header by flow only by pressure compensation tubes. By means of pressure equalization, this equalization collector effects an even flow distribution within the combustion chamber rear wall as well as in the tubes of the upper, inclined partial area. In addition, a partial enthalpy compensation of the flow medium flowing through it takes place in the compensation collector. This enthalpy compensation has a favorable effect on the temperature distribution m of the downstream, inclined heating surface, which forms the lower flank of the nose of the generic type.

Die Erfindung wird anhand der Figuren beispielsweise beschrieben. Es zeigen: FIG 1 die schematische Seitenansicht eines Durchlaufdampferzeugers in Zweizugbauart. Auf den dort in den Kreis I eingefaßten Bereich der Brennkammer-Rückwand des ersten Vertikalgaszuges konzentrieren sich die folgenden Figuren.The invention is described with reference to the figures, for example. Show it: 1 shows the schematic side view of a once-through steam generator in two-pass design. The following figures concentrate on the region of the combustion chamber rear wall of the first vertical gas flue which is enclosed in circle I there.

FIG 2 eine perspektivische Darstellung des Überganges des unteren Teilbereiches der Brennkammer-Rückwand in ihren geneigten oberen Teilbereich in Blickrichtung vom Innenraum der Brennkammer nach außen und unter Weglassung der zur Heizgasführung zwischen den Dampferzeugerrohren vorhandenen und mit diesen gasdicht verschweißten Verbindungsstege.2 shows a perspective view of the transition of the lower section of the combustion chamber rear wall into its inclined upper section in the direction of view from the interior of the combustion chamber to the outside and with the omission of the connecting webs which are present for the heating gas flow between the steam generator tubes and are welded to said gas-tight.

FIG 3 eine Darstellung analog FIG 2 mit Blickrichtung von außen in Richtung auf den Innenraum der Brennkammer.3 shows a representation analogous to FIG. 2 looking from the outside towards the interior of the combustion chamber.

FIG 4 einen vertikalen Querschnitt durch den Ausgleichsammler und durch den Übergang vom unteren in den oberen geneigten Teilbereich der Brennkammer-Rückwand entsprechend der Schnittlinie IV-IV in FIG 3 und 5.4 shows a vertical cross section through the compensating collector and through the transition from the lower to the upper inclined partial region of the combustion chamber rear wall in accordance with the section line IV-IV in FIGS. 3 and 5.

FIG 5 eine Schnitt- und Seitenansicht des Überganges des unteren Teilbereiches der Brennkammer-Rückwand in den oberen, geneigten Teilbereich entsprechend der5 shows a sectional and side view of the transition of the lower section of the combustion chamber rear wall into the upper, inclined section corresponding to FIG

Schnittlinie V-V in FIG 3 und 4.Section line V-V in FIGS. 3 and 4.

FIG 6 eine Draufsicht auf den besagten Übergangsbereich und zusätzlich auf den Ausgleichsammler entsprechend den Pfeilrichtungen VI in den FIG 4 und 5.6 shows a plan view of the said transition area and additionally of the compensation collector in accordance with the arrow directions VI in FIGS. 4 and 5.

Der erfindungsgemäße Durchlaufdampferzeuger ist ein solcher in Zweizugbauart. Das bedeutet, daß in Durchgangsrichtung 1 bis 3 der Heizgase hintereinander ein erster Vertikalgaszug 4 mit aufsteigender Heizgasführung, ein Horizontalgaszug 5 und ein zweiter Vertikalgaszug 6 mit absteigender Heizgasfuhrung in Reihe hintereinander angeordnet sind. Ein solcher Dampferzeuger in Zweizugbauart hat im wesentlichen den Vorteil niedriger Bauhohe Außenabmessungen mit anderen hier nicht erwahn- ten Eigenschaften.The continuous steam generator according to the invention is of the two-pass type. This means that in the passage direction 1 to 3 of the heating gases, a first vertical gas train 4 with ascending heating gas flow, a horizontal gas train 5 and a second vertical throttle cable 6 with descending heating gas guidance are arranged in a row. Such a two-pass type steam generator essentially has the advantage of low overall external dimensions with other properties not mentioned here.

Vorliegend interessiert im wesentlichen die konstruktive Ausgestaltung und Aufhangung der Ruckwand 7 der Brennkammer 8 des ersten Vertikalgaszuges 4. Diese Ruckwand 7 ist durch eine Verdampferheizflache gebildet, welche im wesentlichen aus nebeneinander aufsteigenden und zur Bildung der Umfas- sungswand gasdicht miteinander verbundenen sowie für das Durchströmen eines Stromungsmediums parallel geschalteten Dampferzeugerrohren 9 besteht. Diese Rohre sind m den Zeich- nungen unter Einschluß von offenen Zwischenräumen dargestellt, m der Praxis aber in hier nicht naher dargestellter Art und Weise gasdicht verschlossen. Sie bilden dadurch für die einzelnen Gaszuge eine undurchlässige Umfassungswand. Die Brennkammer-Ruckwand 7 ist die dem zweiten Vertikalgaszug 6 zugewandte Umfassungswand des ersten Vertikalgaszuges 4 und im wesentlichen vertikal ausgerichtet. Fossiler Brennstoff wird der Brennkammer 8 durch Brenner 10 von außen zugeführt. Bei seiner Verbrennung entsteht das die Gaszuge 4 bis 6 durchströmende Heizgas.In the present case, the constructional design and suspension of the rear wall 7 of the combustion chamber 8 of the first vertical gas flue 4 are essentially of interest. This rear wall 7 is formed by an evaporator heating surface, which essentially consists of ascending and gas-tight connection to one another and for the flow through one Flow medium connected in parallel steam generator tubes 9. These tubes are shown in the drawings with the inclusion of open spaces, but in practice are sealed gas-tight in a manner not shown here. As a result, they form an impermeable surrounding wall for the individual gas flues. The combustion chamber rear wall 7 is the peripheral wall of the first vertical gas flue 4 facing the second vertical gas flue 6 and is oriented substantially vertically. Fossil fuel is supplied to the combustion chamber 8 from the outside by burners 10. When it is burned, the heating gas flowing through gas flues 4 to 6 is produced.

Wahrend die Ruckwand 7 m ihrem unteren Teilbereich 14 etwa vertikal ausgerichtet ist, ist sie m ihrem oberen Teilbereich 11 zum Innenraum der Brennkammer 8 hin einwärts geneigt. Sie bildet dadurch mit dem Boden 12 des angrenzenden Horizontalgaszuges 5 eine m die Brennkammer 8 hineinstehende „Nase" 13. Eine solche Nase 13 dient zum Zweck einer guten Rauchgasfuhrung. Sie ist gattungsgemaßer Bestandteil des er- fmdungsgemaßen Dampferzeugers. Im unteren Teilbereich 14 der Rückwand 7 sind die Dampferzeugerrohre 9 von im wesentlichen gleicher Ausbildung und vertikaler Ausrichtung mit gleichmäßigen Parallelabständen vonein¬ ander. Allerdings unterscheiden sich einige - in den Zeich- nungen zusätzlich mit C gekennzeichnet - Dampferzeugerrohre 9 von den übrigen mit A gekennzeichneten Dampferzeugerrohren dadurch, daß sie mit der weiteren Funktion als Tragrohre C der Brennkammer-Rückwand 7 ungeneigt nach oben bis zu einer außerhalb der Heizgasführung befindlichen Austrittssammler 15 geführt sind und dort in diesen münden. Dieser Austrittssamm- ler 15 ist Teil einer Tragkonstruktion 24, die in ihrer konstruktiven Ausgestaltung nicht näher sondern nur hinsichtlich der Positionierung ihres an einem ungeneigt in den Bereich außerhalb der Heizgasführung nach oben herausgeführten Dampf- erzeugerrohres 9C mit der Bezugsziffer 24 dargestellt ist. Der Austrittsammler 15 befindet sich oberhalb der Kesseldecke 23. Die Rohre der Nase 13 gehen in die Rohre des Bodens 12 des Horizontalgaszuges 5 über und münden ebenfalls in einen Sammler. Beide Rohrgruppen werden wasser- bzw. da pf- seitig parallel durchströmt.While the rear wall 7 is oriented approximately vertically in its lower section 14, it is inclined inwards in its upper section 11 toward the interior of the combustion chamber 8. As a result, it forms with the bottom 12 of the adjacent horizontal gas flue 5 a "nose" 13 protruding into the combustion chamber 8. Such a nose 13 serves for the purpose of good flue gas guidance. It is a generic component of the steam generator according to the invention. In the lower portion 14 of the rear wall 7 of the steam generator tubes 9 are of substantially the same design and vertical alignment with uniform parallel distances vonein ¬ other. However, some of the steam generator tubes 9 - additionally marked C in the drawings - differ from the other steam generator tubes marked A in that, with the further function as support tubes C of the combustion chamber rear wall 7, they are inclined upward to one outside the heating gas duct Outlet collector 15 are guided and lead there into this. This outlet manifold 15 is part of a supporting structure 24, which is shown in its constructive configuration not in more detail but only with regard to the positioning of its steam generator tube 9C, which is led out upward at an incline into the area outside the heating gas duct with the reference number 24. The outlet header 15 is located above the boiler ceiling 23. The tubes of the nose 13 merge into the tubes of the bottom 12 of the horizontal gas flue 5 and also open into a header. Both groups of pipes are flowed through in parallel on the water side and on the Pf side.

Die mit der zusätzlichen Funktion eines Tragrohres C versehenen Dampferzeugerrohre 9 sind gleichmäßig über die Brennkammer-Rückwand 7 verteilt. Bei dem Ausführungsbeispiel sind etwa 25% der in die Brennkammer-Rückwand 7 integriertenThe steam generator tubes 9 provided with the additional function of a support tube C are evenly distributed over the combustion chamber rear wall 7. In the exemplary embodiment, about 25% of those integrated into the combustion chamber rear wall 7

Dampferzeugerrohre 9 als Tragrohre C ungeneigt nach oben ge¬ führt, während alle übrigen Dampferzeugerrohre 9A in den oberen geneigten Teilbereich 11 hineingebogen sind, wie das besonders anschaulich aus den Figuren 2 und 3 ersichtlich ist.Steam generator tubes 9 as supporting tubes C disinclined leads to ge ¬ above, while all other steam generator tubes 9A are bent into the upper inclined portion 11, as can be seen particularly clearly from Figures 2 and 3. FIG.

Die Dampferzeugerrohre 9 des unteren Teilbereiches 14 der Brennkammer-Rückwand 7 sind auf ihrer der Brennkammer 8 abgewandten Seite unterhalb des geneigten Teilbereiches 11 durch einen etwa horizontal verlaufenden Ausgleichsammler 16 strö- mungsmäßig miteinander verbunden. Die zum geneigten Teilbereich 11 der Brennkammer-Ruckwand 7 fuhrenden Dampferzeugerrohre 9A sind unterhalb ihrer Abbie- gungen 17 durch jeweils ein Eintrittsrohr 18 und darüber ein Austrittsrohr 19 mit dem Sammler 16 stromungsmaßig verbunden. Sie munden dabei m den Scheiteibereich 20 des Sammlers 16 ein (Eintrittsrohr 18) bzw. sind vom Scheitelbereich 20 abgeleitet (Austrittsrohr 19) . In dem Dampferzeugerrohr 9A befindet sich zwischen dem Eintrittsrohr 18 und dem Austrittsrohr 19 eine Trennscheibe 25, so daß das gesamte Stromungsmedium aus dem unteren Teilbereich 14 des Dampferzeugerrohres 9A m den Sammler 16 strömt.The steam generator tubes 9 of the lower section 14 of the combustion chamber rear wall 7 are connected to one another in terms of flow on their side facing away from the combustion chamber 8 below the inclined section 11 by an approximately horizontally running compensating collector 16. The steam generator tubes 9A leading to the inclined partial region 11 of the combustion chamber rear wall 7 are connected below their bends 17 by means of an inlet tube 18 and above an outlet tube 19 with the collector 16 in terms of flow. In the process, they flow into the crown area 20 of the collector 16 (inlet pipe 18) or are derived from the crown area 20 (outlet pipe 19). In the steam generator tube 9A there is a separating disk 25 between the inlet tube 18 and the outlet tube 19, so that the entire flow medium flows out of the lower partial region 14 of the steam generator tube 9Am the collector 16.

Die als Tragrohre 9C erfindungsgemaß eingesetzten Dampferzeugerrohre 9 sind lediglich durch m etwa den Aquatorbereich des lichten Querschnittes des Ausgleichsa mlers 16 horizontal einmundende Druckausgleichsrohre 21 raumlich mit dem Sammler 16 verbunden. Der Hauptstrom des Stromungsmediums fließt dabei direkt aus einem Dampferzeugerrohr 9 im unteren Teilbereich m das Tragrohr 9C. Bei der dargestellten Ausfuhrungs- form sind im U fangsbereich des Sammlers 16, und zwar imThe steam generator tubes 9 used as support tubes 9C according to the invention are spatially connected to the collector 16 only by m approximately the aquator area of the clear cross section of the equalizing cylinder 16 horizontally incoming pressure equalizing tubes 21. The main flow of the flow medium flows directly from a steam generator tube 9 in the lower section m the support tube 9C. In the illustrated embodiment there are 16 in the U area of the collector, namely in

Scheiteibereich 20 den horizontalen Emtrittsrohren 21 seitens der Tragrohre 9C Austπttsrohre 22 mit gleichem Querschnitt wie die anderen Rohre zugeordnet, die geradlinig geneigt in den oberen Teilbereich 11 der Brennkammer-Ruckwand 7 hineingeführt sind und dort neben den anderen Dampferzeugerrohren 9A in gleicher Weise die Funktion eines Dampferzeugerrohres übernehmen. Die geneigten Austrittsrohre 22 sind an den zugeordneten Tragrohren 9C m einer Biegung vorbeige- fuhrt, so daß sie im geneigten oberen Teilbereich 11 dieselbe Abstandsposition wie im unteren Teilbereich 14 die Tragrohre 9C als Dampferzeugerrohre einnehmen.Log area 20 is assigned to the horizontal discharge pipes 21 on the part of the support pipes 9C discharge pipes 22 with the same cross section as the other pipes, which are inclined in a straight line into the upper section 11 of the combustion chamber rear wall 7 and there, in addition to the other steam generator pipes 9A, function in the same way as a steam generator pipe take. The inclined outlet pipes 22 are guided past the assigned support pipes 9C with a bend, so that they assume the same spacing position in the inclined upper section 11 as the support pipes 9C as steam generator pipes in the lower section 14.

Eine andere, hier nicht dargestellte Ausfuhrungsform verzichtet auf die oberen Austrittsrohre 22 als im geneigten oberen Teilbereich 11 zusätzlich wirksame Dampferzeugerrohre . Es sind dann im oberen geneigten Teilbereich 11 als Dampferzeugerrohre nur die aus dem unteren Teilbereich 14 über die Ab- biegungen 17 geneigten Dampferzeugerrohre 9A vorhanden. Another embodiment, not shown here, dispenses with the upper outlet pipes 22 as steam generator pipes which are additionally effective in the inclined upper section 11. It then only steam generator tubes 9A inclined from the lower partial region 14 via the bends 17 are present in the upper inclined partial region 11 as steam generator tubes.

Claims

Patentansprüche claims 1. Durchlaufdampferzeuger in Zweizugbauart mit in Durchgangsrichtung (1-3) der Heizgase hintereinander - einem ersten Vertikalgaszug (4) mit aufsteigender Heizgas- fuhrung und einem Horizontalgaszug (5) bei welchem die durch eine Verdampferheizflache aus nebeneinander aufstei- genden, gasdicht miteinander verbundenen sowie für das1. Continuous-flow steam generator in two-pass design with the heating gases one behind the other in the direction of passage (1-3) - a first vertical gas pass (4) with ascending heating gas flow and a horizontal gas pass (5) in which the gas ascending from one another, gas-tightly connected to each other, and for the Durchströmen eines Stromungsmediums parallel geschalteten Dampferzeugerrohren (9) gebildete, etwa in Richtung des Horizontalgaszuges (5) stehende und im wesentlichen vertikal ausgerichtete Brennkammer-Ruckwand (7) des ersten Vertikalzuges (4) in einem oberen Teilbereich (11) zur Brennkammer (8) hin einwärts geneigt ist und dadurch mit dem Boden (12) des angrenzenden Horizontalgaszuges (5) eine in die Brennkammer (8) hineinstehende Nase (13) bildet, d a d u r c h g e k e n n z e i c h n e t, daß einigeFlow through a flow medium of steam generator tubes (9) connected in parallel and substantially vertically oriented combustion chamber rear wall (7) of the first vertical train (4) in the upper part (11) towards the combustion chamber (8), which is approximately in the direction of the horizontal gas flue (5) is inclined inward and thereby forms with the bottom (12) of the adjacent horizontal gas flue (5) a nose (13) protruding into the combustion chamber (8), characterized in that some Dampferzeugerrohre (9C) des unteren Teilbereiches (14) der Brennkammer-Ruckwand (7) als deren Trager ungeneigt bis zu einer außerhalb der Heizgasführung befindlichen Tragkonstruktion (24) nach oben gefuhrt sind, wobei die Dampferzeuger- röhre (9A) unterhalb des oberen Teilbereiches (11) der geneigten Brennkammer-Ruckwand (7) durch einen auf ihrer der Brennkammer (8) abgewandten Seite etwa horizontal verlaufenden Ausgleichsammler (16) stromungsmaßig miteinander verbunden sind, und wobei auch die als Trager vorgesehenen Dampf- erzeugerrohre (9C) jeweils durch ein Druckausgleichsrohr (21) stromungsmaßig mit dem Ausgleichssammler (16) verbunden sind,Steam generator tubes (9C) of the lower section (14) of the combustion chamber rear wall (7) as their supports are not inclined up to a support structure (24) located outside the heating gas duct, the steam generator pipe (9A) below the upper section ( 11) of the inclined combustion chamber rear wall (7) are connected to one another in terms of flow by a compensating collector (16) which runs approximately horizontally on its side facing away from the combustion chamber (8), and the steam generator pipes (9C) provided as supports are each connected by a pressure compensation pipe (21) are connected in terms of flow to the compensating collector (16), 2. Dampferzeuger nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß die Tragrohre (9C) weitge- hend gleichmäßig über die Breitenerstreckung der Brennkammer- Rückwand (7) verteilt sind.2. Steam generator according to claim 1, characterized in that the support tubes (9C) widely hend are evenly distributed over the width of the combustion chamber rear wall (7). 3. Dampferzeuger nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t, daß die zum oberen Teilbereich (11) der Brennkammer-Rückwand (7) führenden Dampferzeugerrohre (9A) unterhalb ihrer Abbiegung (17) durch jeweils ein Eintritts- (18) und ein darüber angeordnetes Austrittsrohr (19) mit dem Ausgleichsammler (16) verbunden sind und daß sich in dem Dampferzeugerrohr (9A) zwischen dem abgehenden Eintrittsrohr (18) und dem ankommenden Austrittsrohr (19) eine Trennscheibe (25) befindet.3. Steam generator according to claim 1 or 2, characterized in that the upper portion (11) of the combustion chamber rear wall (7) leading steam generator tubes (9A) below their bend (17) through an inlet pipe (18) and an outlet pipe arranged above it (19) are connected to the compensating collector (16) and that there is a separating disc (25) in the steam generator tube (9A) between the outgoing inlet tube (18) and the incoming outlet tube (19). 4. Dampferzeuger nach Anspruch 3, d a d u r c h g e k e n n z e i c h n e t, daß das Eintritts- (18) und das Austrittsrohr (19) in den Scheitelbereich (20) des Ausgleichsammlers (16) einmünden bzw. von diesem abgeleitet sind.4. Steam generator according to claim 3, so that the inlet pipe (18) and the outlet pipe (19) open into the apex region (20) of the compensating collector (16) or are derived therefrom. 5. Dampferzeuger nach ein oder mehreren der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, daß im Bereich eines Tragrohres (9C) ein gesondertes Austrittsrohr (22) aus dem Ausgleichsammler (16) heraus und parallel zu den benachbarten anderen Dampferzeugerrohren (9) geneigt in den oberen Teilbereich (11) der Brennkammer-Rückwand (7) eingeführt ist.5. Steam generator according to one or more of the preceding claims, characterized in that in the region of a support tube (9C) a separate outlet tube (22) from the compensating header (16) and parallel to the adjacent other steam generator tubes (9) inclined in the upper portion ( 11) the combustion chamber rear wall (7) is inserted. 6. Dampferzeuger nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t, daß das geneigte Austrittsrohr (22) an dem zugeordneten Trägerrohr (9C) gebogen vorbei- geführt ist. 6. Steam generator according to claim 5, so that the inclined outlet pipe (22) is bent past the associated support pipe (9C).
EP98932012A 1997-05-09 1998-04-27 Continuous steam generator Expired - Lifetime EP0980496B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19719724 1997-05-09
DE19719724 1997-05-09
PCT/DE1998/001167 WO1998051964A1 (en) 1997-05-09 1998-04-27 Continuous steam generator

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EP0980496A1 true EP0980496A1 (en) 2000-02-23
EP0980496B1 EP0980496B1 (en) 2002-06-26

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JP (1) JP3899132B2 (en)
KR (1) KR100444497B1 (en)
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EP2213936A1 (en) * 2008-11-10 2010-08-04 Siemens Aktiengesellschaft Continuous-flow steam generator
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DE102013215457A1 (en) 2013-08-06 2015-02-12 Siemens Aktiengesellschaft Continuous steam generator in two-pass boiler design
CN105402748A (en) * 2015-12-28 2016-03-16 高洪福 Guide device for flue gas at outlet of coal-fired boiler furnace
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CN106152102A (en) * 2016-07-11 2016-11-23 华中科技大学 A kind of tower boiler reducing gas temperature windage
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EP0980496B1 (en) 2002-06-26
CN1112536C (en) 2003-06-25
DE59804591D1 (en) 2002-08-01
CA2288676A1 (en) 1998-11-19
WO1998051964A1 (en) 1998-11-19
ES2179516T3 (en) 2003-01-16
JP2001525050A (en) 2001-12-04
DK0980496T3 (en) 2002-10-14
US6651596B1 (en) 2003-11-25
CA2288676C (en) 2007-02-13
JP3899132B2 (en) 2007-03-28
KR20010012356A (en) 2001-02-15
CN1254408A (en) 2000-05-24

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