EP0415877A1 - Steam generator with furnace - Google Patents

Steam generator with furnace Download PDF

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Publication number
EP0415877A1
EP0415877A1 EP90810588A EP90810588A EP0415877A1 EP 0415877 A1 EP0415877 A1 EP 0415877A1 EP 90810588 A EP90810588 A EP 90810588A EP 90810588 A EP90810588 A EP 90810588A EP 0415877 A1 EP0415877 A1 EP 0415877A1
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EP
European Patent Office
Prior art keywords
steam generator
metal strips
wall
sheet metal
pair
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Granted
Application number
EP90810588A
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German (de)
French (fr)
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EP0415877B1 (en
Inventor
Henryk Melcer
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ABB Management AG
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ABB Management AG
Sulzer AG
Gebrueder Sulzer AG
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Application filed by ABB Management AG, Sulzer AG, Gebrueder Sulzer AG filed Critical ABB Management AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
    • F22B37/208—Backstay arrangements

Definitions

  • the invention relates to a fired steam generator with a rectangular cross-section having a gas passageway which limits the heat-emitting gas flow, the peripheral walls of which are formed from tubes which are welded together in a gas-tight manner and which extend in the longitudinal direction of the steam generator and through which a heat-absorbing working medium flows.
  • it is customary to provide a plurality of belt supports arranged essentially parallel to the wall and transversely to the longitudinal direction of the steam generator, which are distributed in the longitudinal direction of the steam generator over the surrounding walls.
  • the continuous tension belts relieve the tube walls of tensile forces by absorbing the tensile forces themselves, which are then passed into the belt carriers.
  • the Material expenditure for the continuous drawstrings is relatively large, especially if the surrounding walls have a very large width, for example more than 10 m.
  • the invention has for its object to improve the drawstring construction in steam generators with the belt supports described so that the material expenditure for the drawstrings is significantly reduced.
  • each extending from the corner region of the throttle cable cross section over a shorter part than half the width of the surrounding wall are provided, each of which consists of at least a pair of sheet metal strips, which at their end section near the corner region and are connected to the wall at their end section facing the center of the wall via comb plates and which at their end section near the corner region are connected in an articulated manner to the associated belt carrier via tabs.
  • the drawstring no longer extends over the entire width of the surrounding wall, but is divided into two parts, each part of which extends over less than half the wall width. This considerably reduces the material expenditure.
  • the surrounding wall takes over part of the resulting tensile force which acts transversely to the longitudinal direction of the gas cable.
  • the distribution of the forces can be optimized by the choice of the width of the tension band, the length of the tension band and the number of tubes welded to the comb plates.
  • the new drawstring design is particularly important for steam generators with large gas cross sections, ie for wall widths larger than 10 m.
  • FIGS. 1 and 2 four vertical peripheral walls 1, 2, 3, 4 delimit a gas train 5 with a rectangular cross section of a fired steam generator.
  • the throttle cable 5 can contain a furnace in its lower part, in which a heat-emitting gas stream is generated which flows upwards in the gas cable 5.
  • Distributed over the height of the throttle cable 5 are belt supports 12, the length of which is substantially equal to the width B of the associated throttle cable wall and against which the gas cable walls 1 to 4 are supported by support elements 6.
  • the belt supports 12 prevent buckling of the throttle cable walls 1 to 4 in the event of excess pressure in the gas cable 5, for example as a result of deflagrations.
  • the second gas train just mentioned, in which the heat-emitting gas stream flows downward, can also be surrounded by belt carriers 12.
  • the surrounding walls 1 and 4 of the throttle cable 5 consist of pipes 7 and 7 'through which working fluid flows, which are arranged in the longitudinal direction of the gas cable and are interposed via interposed webs 8 and 8' to form gas-tight walls, also called membrane walls.
  • the walls 2 and 3, not shown in FIG. 3, are constructed in the same way.
  • a drawstring 9 or 9 ' is arranged, which abuts the tubes 7 and 7' and - seen from the Gäszugecke - from the third wall tube towards the center of the wall 1 or 4 extends.
  • the total length of each drawstring 9 or 9 ' is shorter than half the width B of the tube wall against which it is applied.
  • each drawstring 9 consists of two pairs 10 and 11 of sheet metal strips 13, 14 and 15, 16 each having a flat, rectangular cross section.
  • the two pairs 10 and 11 are identical among themselves.
  • the outer edges of the sheet metal strips 13 and 14 of the pair 10 resting on the pipes with their broad side are at their end section facing the gas corner over a right angle to the pipe wall standing comb plate 17, 18 with four tubes 7 of wall 1 welded.
  • the end section of the two sheet metal strips 13 and 14 of the pair 10 facing the center of the wall is welded to a comb plate 19 arranged between them and at right angles to the tube wall, also with four tubes of the wall 1.
  • the comb plates 17, 18, 19 have cutouts corresponding to the outline of the pipes to be welded with them and preferably have the same thickness.
  • one or more web plates 20 can be arranged between the metal strips 13 and 14 distributed over the wall and welded to the latter and the metal strip.
  • a collar plate 21 is welded to each of the end sections facing the gas corner, to which a tab 22 is articulated (FIG. 3).
  • Each tab 22 is hinged at its other end to a belt support 12 which extends essentially horizontally and parallel to the wall 1.
  • FIG. 5 shows the distribution of the forces occurring in the event of a deflagration in a pipe wall, in which a web plate 20 is provided between the metal strips 13 and 14 and 15 and 16 on the next free pipe to the right of the comb plates 17 and 18.
  • the force distribution begins at the right end of the web plate 20 at an angle of 45 ° upward or downward extending over the height H, which is equal to the distance between two adjacent beam flanges 12th
  • the force curve is indicated by the dashed lines b.
  • the tension increase in the pipe wall is more favorable compared to a construction with a drawstring running from corner to corner. If the tension band is shorter, there would be an additional increase in tension, which should be avoided.
  • the width of the web plates 20 and 20 ' can be shorter than in Fig. 3, e.g. equal to or smaller than the width of the webs 8 or 8 ', so that the web plates have no recess corresponding to the outline of a tube 7.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The steam generator with furnace has a gas flue (5) which delimits the heat-emitting gas flow and has a rectangular cross-section and the external walls (1, 4) of which are formed from pipes (7, 7') which are interconnected in a gastight manner, extend in the longitudinal direction of the steam generator and are flowed through by a heat-absorbing medium. For each external wall (1, 4) a number of flanged beams (12) are provided which are arranged essentially parallel to the wall and transversely to the longitudinal direction of the steam generator and which are distributed over the external wall (1, 4) in the longitudinal direction of the steam generator. At the height of the flanged beams (12), there are arranged tie members (9, 9') which bear against the pipes and in each case extend from the corner region of the gas flue cross-section over a part shorter than half the width of the external wall (1, 4). Each tie member consists of at least one pair of sheet-metal strips which, at their end section close to the corner region and at their end section facing the wall centre, are connected to the wall (1, 4) via comb-type sheets (17, 18 or 19) and which, at their end section close to the corner region, are connected in an articulated manner to the associated flanged beam (12) via link plates (22). <IMAGE>

Description

Die Erfindung bezieht sich auf einen befeuerten Dampfer­zeuger mit den wärmeabgebenden Gasstrom begrenzendem, rechteckigen Querschnitt aufweisendem Gaszug, dessen Umfassungswände aus gasdicht miteinander verschweissten, in Längsrichtung des Dampferzeugers sich erstreckenden und von einem wärmeaufnehmenden Arbeitsmittel durchström­ten Rohren gebildet sind. Bei solchen Dampferzeugern ist es üblich, je Umfassungswand mehrere im wesentlichen parallel zur Wand und quer zur Längsrichtung des Dampfer­zeugers angeordnete Gurtträger vorzusehen, die in Längs­richtung des Dampferzeugers über die Umfassungswände verteilt sind. Auf der Höhe der Gurtträger sind normaler­weise sich über die ganze Breite der Umfassungswand erstreckende Zugbänder vorgesehen, die an ihren Enden gelenkig mit je einem Gurtträger verbunden sind, der rechtwinklig zu dem betreffendem Zugband verläuft, d.h. jeweils parallel zu den beiden Nachbarwänden, über die sich das Zugband nicht erstreckt. Durch diese Anordnung der Zugbänder und Gurtträger wird ein Ausbeulen der Umfassungswände im Falle eines Auftretens von Ueberdruck im Gaszug verhindert. Solche Ueberdrücke können z.B. bei Verpuffungen auftreten.The invention relates to a fired steam generator with a rectangular cross-section having a gas passageway which limits the heat-emitting gas flow, the peripheral walls of which are formed from tubes which are welded together in a gas-tight manner and which extend in the longitudinal direction of the steam generator and through which a heat-absorbing working medium flows. In such steam generators, it is customary to provide a plurality of belt supports arranged essentially parallel to the wall and transversely to the longitudinal direction of the steam generator, which are distributed in the longitudinal direction of the steam generator over the surrounding walls. At the level of the belt straps there are normally tension straps extending over the entire width of the surrounding wall, which at their ends are connected in an articulated manner to a strap strut which runs at right angles to the respective tension strap, i.e. in each case parallel to the two neighboring walls over which the drawstring does not extend. This arrangement of the drawstrings and belt carriers prevents the surrounding walls from bulging in the event of excess pressure occurring in the throttle cable. Such pressures can e.g. occur with deflagrations.

Beim Auftreten eines solchen Ueberdrucks entlasten also die durchlaufenden Zugbänder die Rohrwände von Zug­kräften, indem sie selbst die Zugkräfte aufnehmen, die dann in die Gurtträger geleitet werden. Der Werkstoffaufwand für die durchlaufenden Zugbänder ist verhältnismässig gross, insbesondere dann wenn die Umfassungswände sehr grosse Breite aufweisen, z.B. mehr als 10 m.When such excess pressure occurs, the continuous tension belts relieve the tube walls of tensile forces by absorbing the tensile forces themselves, which are then passed into the belt carriers. The Material expenditure for the continuous drawstrings is relatively large, especially if the surrounding walls have a very large width, for example more than 10 m.

Der Erfindung liegt die Aufgabe zugrunde, bei Dampferzeu­gern mit den beschriebenen Gurtträgern die Zugbandkon­struktion so zu verbessern, dass der Werkstoffaufwand für die Zugbänder wesentlich vermindert wird.The invention has for its object to improve the drawstring construction in steam generators with the belt supports described so that the material expenditure for the drawstrings is significantly reduced.

Erfindungsgemäss sind auf der Höhe der Gurtträger an den Rohren anliegende, sich jeweils vom Eckbereich des Gaszugquerschnittes aus über einen kürzeren Teil als die halbe Breite der Umfassungswand erstreckende Zugbänder vorgesehen, von denen jedes aus mindestens einem Paar Blechstreifen besteht, die an ihrem Endabschnitt nahe dem Eckbereich und an ihrem der Wandmitte zugewendeten Endabschnitt über Kammbleche mit der Wand verbunden sind und die an ihrem Endabschnitt nahe dem Eckbereich über Laschen gelenkig mit dem zugehörigen Gurtträger verbunden sind.According to the invention at the height of the belt bearers on the tubes, each extending from the corner region of the throttle cable cross section over a shorter part than half the width of the surrounding wall, are provided, each of which consists of at least a pair of sheet metal strips, which at their end section near the corner region and are connected to the wall at their end section facing the center of the wall via comb plates and which at their end section near the corner region are connected in an articulated manner to the associated belt carrier via tabs.

Bei dieser Zugbandkonstruktion erstreckt sich also das Zugband nicht mehr über die ganze Breite der Umfassungs­wand, sondern es ist in zwei Teile unterteilt, von denen jeder Teil sich über weniger als die halbe Wandbreite erstreckt. Dadurch wird also der Werkstoffaufwand erheb­lich vermindert. Zugleich übernimmt die Umfassungswand im Falle eines Auftretens eines Ueberdruckes im Gaszug einen Teil der dadurch entstehenden Zugkraft, die quer zur Längsrichtung des Gaszuges wirkt. Durch die Aufteilung jedes Zugbandes in mindestens ein Paar Blechstreifen, die an ihren Endabschnitten über Kammbleche mit der Rohrwand verschweisst sind, ergibt sich eine gute Einleitung der Zugkräfte von der Rohrwand in das Zugband. Durch die Wahl der Zugbandbreite, der Zugbandlänge und der Anzahl der mit den Kammblechen verschweissten Rohre lässt sich die Verteilung der Kräfte optimieren. Die neue Zugbandkon­struktion ist besonders für Dampferzeuger mit grossen Gaszugquerschnitten von Bedeutung, d.h. bei Wandbreiten die grösser als 10 m sind.With this drawstring construction, the drawstring no longer extends over the entire width of the surrounding wall, but is divided into two parts, each part of which extends over less than half the wall width. This considerably reduces the material expenditure. At the same time, in the event of an overpressure occurring in the throttle cable, the surrounding wall takes over part of the resulting tensile force which acts transversely to the longitudinal direction of the gas cable. The division of each drawstring into at least one pair of sheet metal strips, which are welded to the tube wall at their end sections via comb sheets, results in a good introduction of the Tractive forces from the pipe wall into the drawstring. The distribution of the forces can be optimized by the choice of the width of the tension band, the length of the tension band and the number of tubes welded to the comb plates. The new drawstring design is particularly important for steam generators with large gas cross sections, ie for wall widths larger than 10 m.

Einige Ausführungsbeispiele der Erfindung werden in der folgenden Beschreibung anhand der Zeichnung näher erläu­tert. Es zeigen:

  • Fig. 1 stark vereinfacht die Ansicht eines Dampferzeugers mit mehreren Gurtträgern,
  • Fig. 2 einen Horizontalschnitt nach der Linie II-II in Fig. 1,
  • Fig. 3 einen Horizontalschnitt durch den Eckbe­reich A des Dampferzeugers in Fig. 2, in grösserem Massstab,
  • Fig. 4 eine Ansicht eines aus zwei Blechstreifen­paaren bestehenden Zugbandes und
  • Fig. 5 eine Ansicht eines Teils einer Rohrwand mit zwei daran befestigten Zugbändern.
Some embodiments of the invention are explained in more detail in the following description with reference to the drawing. Show it:
  • 1 greatly simplified the view of a steam generator with several belt carriers,
  • 2 is a horizontal section along the line II-II in Fig. 1,
  • 3 shows a horizontal section through the corner region A of the steam generator in FIG. 2, on a larger scale,
  • Fig. 4 is a view of a tension strip consisting of two pairs of sheet metal strips and
  • Fig. 5 is a view of part of a tube wall with two tension bands attached.

Gemäss Fig. 1 und 2 begrenzen vier vertikale Umfassungs­wände 1,2,3,4 einen im Querschnitt rechteckigen Gaszug 5 eines befeuerten Dampferzeugers. Der Gaszug 5 kann in seinem unteren Teil eine Feuerung enthalten, in der ein wärmeabgebender Gasstrom entsteht, der im Gaszug 5 aufwärts strömt. Am oberen Ende des Gaszuges kann ein zu einem zweiten Gaszug führender Querzug oder direkt ein Kamin angeschlossen sein. Ueber die Höhe des Gaszuges 5 verteilt sind aussen Gurtträger 12 angeordnet, deren Länge im wesentlichen gleich der Breite B der zugehörigen Gaszugwand ist und an denen sich die Gaszugwände 1 bis 4 über Stützelemente 6 abstützen. Die Gurtträger 12 verhin­dern ein Ausbeulen der Gaszugwände 1 bis 4 im Falle des Auftretens von Ueberdruck im Gaszug 5, z.B. als Folge von Verpuffungen. Der eben erwähnte zweite Gaszug, in dem der wärmeabgebende Gasstrom abwärts strömt, kann auch von Gurtträgern 12 umgeben sein.According to FIGS. 1 and 2, four vertical peripheral walls 1, 2, 3, 4 delimit a gas train 5 with a rectangular cross section of a fired steam generator. The throttle cable 5 can contain a furnace in its lower part, in which a heat-emitting gas stream is generated which flows upwards in the gas cable 5. At the top of the throttle cable you can a second throttle cable leading cross train or directly connected to a fireplace. Distributed over the height of the throttle cable 5 are belt supports 12, the length of which is substantially equal to the width B of the associated throttle cable wall and against which the gas cable walls 1 to 4 are supported by support elements 6. The belt supports 12 prevent buckling of the throttle cable walls 1 to 4 in the event of excess pressure in the gas cable 5, for example as a result of deflagrations. The second gas train just mentioned, in which the heat-emitting gas stream flows downward, can also be surrounded by belt carriers 12.

Gemäss Fig. 3 bestehen die Umfassungswände 1 und 4 des Gaszuges 5 aus Arbeitsmittel durchströmten Rohren 7 bzw. 7′, die in Längsrichtung des Gaszuges angeordnet sind und über zwischengelegte Stege 8 bzw. 8′ zu gasdichten Wänden, auch Membranwände genannt, verschweisst sind. Die in Fig. 3 nicht gezeigten Wände 2 und 3 sind in gleicher Weise aufgebaut. Auf der Aussenseite der Wände 1 und 4 ist je ein Zugband 9 bzw. 9′ angeordnet, das an den Rohren 7 bzw. 7′ anliegt und das - von der Gäszugecke her gesehen - sich vom dritten Wandrohr aus in Richtung gegen die Mitte der Wand 1 bzw. 4 erstreckt. Die Gesamtlänge jedes Zugbandes 9 bzw. 9′ ist kürzer als die halbe Breite B der Rohrwand, an der es anliegt.3, the surrounding walls 1 and 4 of the throttle cable 5 consist of pipes 7 and 7 'through which working fluid flows, which are arranged in the longitudinal direction of the gas cable and are interposed via interposed webs 8 and 8' to form gas-tight walls, also called membrane walls. The walls 2 and 3, not shown in FIG. 3, are constructed in the same way. On the outside of the walls 1 and 4, a drawstring 9 or 9 'is arranged, which abuts the tubes 7 and 7' and - seen from the Gäszugecke - from the third wall tube towards the center of the wall 1 or 4 extends. The total length of each drawstring 9 or 9 'is shorter than half the width B of the tube wall against which it is applied.

Wie aus Fig. 4 ersichtlich ist, besteht jedes Zugband 9 aus zwei Paaren 10 und 11 von je zwei flach-rechteckigen Querschnitt aufweisenden Blechstreifen 13,14 bzw. 15,16. Die beiden Paare 10 und 11 sind unter sich gleich ausge­bildet. Die aussen liegenden Ränder der mit ihrer Breit­seite an den Rohren anliegenden Blechstreifen 13 und 14 des Paares 10 sind an ihrem der Gaszugecke zugewendeten Endabschnitt über je ein rechtwinklig zur Rohrwand stehendes Kammblech 17,18 mit vier Rohren 7 der Wand 1 verschweisst. Der der Wandmitte zugewendete Endabschnitt der beiden Blechstreifen 13 und 14 des Paares 10 ist über ein zwischen ihnen angeordnetes, rechtwinklig zur Rohr­wand stehendes Kammblech 19 mit ebenfalls vier Rohren der Wand 1 verschweisst. Die Kammbleche 17,18,19 haben dem Umriss der mit ihnen zu verschweissenden Rohre entspre­chende Aussparungen und vorzugsweise gleiche Dicke. Zwischen den Kammblechen 17 und 18 einerseits und dem Kammblech 19 andererseits können zwischen den Blechstrei­fen 13 und 14 ein oder mehrere Stegbleche 20 (Fig. 3) über die Wand verteilt angeordnet und mit dieser und dem Blechstreifen verschweisst sein. In Längsrichtung der Blechstreifen 13 und 14 verlaufend, ist an dem der Gaszugecke zugewendeten Endabschnitt je ein Kragenblech 21 angeschweisst, an dem je eine Lasche 22 angelenkt ist (Fig. 3). Jede Lasche 22 ist mit ihrem anderen Ende an einem Gurtträger 12 angelenkt, der sich im wesentlichen horizontal und parallel zur Wand 1 erstreckt.As can be seen from FIG. 4, each drawstring 9 consists of two pairs 10 and 11 of sheet metal strips 13, 14 and 15, 16 each having a flat, rectangular cross section. The two pairs 10 and 11 are identical among themselves. The outer edges of the sheet metal strips 13 and 14 of the pair 10 resting on the pipes with their broad side are at their end section facing the gas corner over a right angle to the pipe wall standing comb plate 17, 18 with four tubes 7 of wall 1 welded. The end section of the two sheet metal strips 13 and 14 of the pair 10 facing the center of the wall is welded to a comb plate 19 arranged between them and at right angles to the tube wall, also with four tubes of the wall 1. The comb plates 17, 18, 19 have cutouts corresponding to the outline of the pipes to be welded with them and preferably have the same thickness. Between the comb plates 17 and 18 on the one hand and the comb plate 19 on the other hand, one or more web plates 20 (FIG. 3) can be arranged between the metal strips 13 and 14 distributed over the wall and welded to the latter and the metal strip. Running in the longitudinal direction of the metal strips 13 and 14, a collar plate 21 is welded to each of the end sections facing the gas corner, to which a tab 22 is articulated (FIG. 3). Each tab 22 is hinged at its other end to a belt support 12 which extends essentially horizontally and parallel to the wall 1.

Die bisher beschriebene Ausbildung des Blechstreifen­paares 10 gilt in gleicher Weise für das zweite, zum Zugband 9 gehörende Blechstreifenpaar 11, das ebenfalls über zwei Kragenbleche 21 und zwei Laschen 22 am Gurtträ­ger 12 angelenkt ist. Ein gleicher Aufbau und eine gleiche Anordnung gilt für das Zugband 9′ der Wand 4, das über vier Kragenbleche 21′ und vier Laschen 22′ mit einem in Fig. 3 nicht dargestellten Gurtträger verbunden ist, der parallel zur Wand 4 verläuft. Die in der gleichen horizontalen Ebene liegenden Kragenbleche 21 und 21′ sind miteinander verschweisst.The previously described design of the pair of sheet metal strips 10 applies in the same way to the second pair of sheet metal strips 11 belonging to the tension band 9, which is also articulated on the belt carrier 12 via two collar plates 21 and two tabs 22. The same structure and the same arrangement applies to the tension band 9 'of the wall 4, which is connected via four collar plates 21' and four tabs 22 'to a belt carrier (not shown in FIG. 3) which runs parallel to the wall 4. The collar plates 21 and 21 'lying in the same horizontal plane are welded together.

Die bisher für den Eckbereich A beschriebene Gestaltung der Zugbänder 9 und 9′ sowie deren Anschluss an die Gurtträger 12 wiederholt sich für die drei übrigen Eckbereiche in Fig. 2. Sie wiederholt sich auch für alle übrigen in Fig. 1 gezeigten Gurtträger 12.The previously described for the corner area A design of the drawstrings 9 and 9 'and their connection to the Belt carrier 12 is repeated for the three remaining corner regions in FIG. 2. It is also repeated for all other belt carriers 12 shown in FIG. 1.

Fig. 5 zeigt die Verteilung der im Falle einer Verpuffung auftretenden Kräfte in einer Rohrwand, bei der je ein Stegblech 20 zwischen die Blechstreifen 13 und 14 sowie 15 und 16 am nächsten freien Rohr rechts von den Kamm­blechen 17 und 18 vorgesehen ist. Die Kraftverteilung beginnt jeweils am rechten Ende des Stegbleches 20 unter einem Winkel von 45o nach oben bzw. nach unten verlaufend über die Höhe H, die gleich dem Abstand zwischen zwei übereinander benachbarten Gurtträgern 12 ist. Der Kraft­verlauf ist durch die gestrichelten Linien b angedeutet. Auf einer <> Linie, die die <senkrechten> Schnittpunkte der Linien b mit den Begrenzungslinien der Höhe H verbindet, befindet sich jeweils der Endpunkt des Zugbandes bzw. der Blechstreifen 13 bis 16. Damit ergibt sich die Länge L des Zugbandes - bis zur Gaszugecke gemessen - aus der Beziehung:
L ≧ (I + 0,5) T + H - G
Darin bedeuten:
I die Anzahl der Rohre, die mit den Kammblechen nahe der Gaszugecke verbunden sind,
T die Rohrteilung in der Rohrwand,
H der Abstand zwischen zwei einander benachbarten Gurtträgern und
G - im Falle dass das Zugband aus zwei Paaren von Blechstreifen besteht - der mittlere Abstand zwischen den beiden Blechstreifenpaaren plus die Dicke des Kammbleches 19.5 shows the distribution of the forces occurring in the event of a deflagration in a pipe wall, in which a web plate 20 is provided between the metal strips 13 and 14 and 15 and 16 on the next free pipe to the right of the comb plates 17 and 18. The force distribution begins at the right end of the web plate 20 at an angle of 45 ° upward or downward extending over the height H, which is equal to the distance between two adjacent beam flanges 12th The force curve is indicated by the dashed lines b. On a <> line that connects the <perpendicular> intersection of lines b with the boundary lines of height H, there is the end point of the drawstring or sheet metal strips 13 to 16. This results in the length L of the drawstring - up to the gas corner measured - from the relationship:
L ≧ (I + 0.5) T + H - G
Where:
I the number of pipes that are connected to the comb plates near the gas corner,
T the pipe division in the pipe wall,
H the distance between two adjacent belt carriers and
G - in the event that the tension band consists of two pairs of sheet metal strips - the average distance between the two pairs of sheet metal strips plus the thickness of the comb plate 19.

Bei einer Dimensionierung der Zugbandlänge nach dieser Beziehung ergibt sich im Vergleich zu einer Konstruktion mit von Ecke zu Ecke durchlaufendem Zugband ein günstiger Verlauf der Spannungserhöhung in der Rohrwand. Bei kürzerer Bemessung des Zugbandes ergäbe sich eine zusätz­liche Spannungserhöhung, die man vermeiden sollte.If the length of the drawstring is dimensioned according to this relationship, the tension increase in the pipe wall is more favorable compared to a construction with a drawstring running from corner to corner. If the tension band is shorter, there would be an additional increase in tension, which should be avoided.

Abweichend von der beschriebenen Ausführungsform kann die Breite der Stegbleche 20 und 20′ kürzer als in Fig. 3 gezeichnet sein, z.B. gleich oder kleiner als die Breite der Stege 8 bzw. 8′, so dass die Stegbleche keine dem Umriss eines Rohres 7 entsprechende Aussparung aufweisen.Deviating from the described embodiment, the width of the web plates 20 and 20 'can be shorter than in Fig. 3, e.g. equal to or smaller than the width of the webs 8 or 8 ', so that the web plates have no recess corresponding to the outline of a tube 7.

Claims (8)

1. Befeuerter Dampferzeuger mit den wärmeabgebenden Gasstrom begrenzendem, rechteckigen Querschnitt aufweisendem Gaszug, dessen Umfassungswände aus gasdicht miteinander verbundenen, in Längsrichtung des Dampferzeugers sich erstreckenden, von einem wärmeaufnehmendem Medium durchströmten Rohren gebil­det sind, mit je Umfassungswand mehreren, im wesent­lichen parallel zur Wand und quer zur Längsrichtung des Dampferzeugers angeordneten Gurtträgern, die in Längsrichtung des Dampferzeugers über die Umfassungs­wand verteilt sind, mit auf der Höhe der Gurtträger angeordneten, an den Rohren anliegenden, sich jeweils vom Eckbereich des Gaszugquerschnittes aus über einen kürzeren Teil als die halbe Breite der Umfassungswand erstreckenden Zugbändern, von denen jedem aus minde­stens einem Paar Blechstreifen besteht, die an ihrem Endabschnitt nahe dem Eckbereich und an ihrem der Wandmitte zugewendeten Endabschnitt über Kammbleche mit der Wand verbunden sind und die an ihrem Endab­schnitt nahe dem Eckbereich über Laschen gelenkig mit dem zugehörigen Gurtträger verbunden sind.1.Fired steam generator with the heat-emitting gas flow-limiting, rectangular cross-section having gas train, the peripheral walls of which are formed in a gas-tight manner and which extend in the longitudinal direction of the steam generator and are flowed through by a heat-absorbing medium, with several peripheral walls, essentially parallel to and transversely to the peripheral wall to the longitudinal direction of the steam generator arranged belt carriers, which are distributed in the longitudinal direction of the steam generator over the peripheral wall, with at the height of the belt carrier, lying on the pipes, each extending from the corner region of the gas cable cross section over a shorter part than half the width of the peripheral wall , each of which consists of at least a pair of sheet metal strips which are connected to the wall by comb plates at their end section near the corner region and at their end section facing the wall center, and which at their end section are hinged near the corner on tabs with the corresponding beam flange. 2. Dampferzeuger nach Anspruch 1, dadurch gekennzeich­net, dass an jedem Paar Blechstreifen an ihrem der Wandmitte zugewendeten Endabschnitt ein Kammblech zwischen den beiden Streifen angeordnet und mit diesen verbunden ist.2. Steam generator according to claim 1, characterized in that a comb plate is arranged between the two strips and connected to each pair of sheet metal strips at their end portion facing the wall center. 3. Dampferzeuger nach Anspruch 2, dadurch gekennzeich­net, dass das zwischen den Blechstreifen angeordnete Kammblech um eine Rohrteilung über die Enden der Blechstreifen hinaus verlängert ist.3. Steam generator according to claim 2, characterized in that the comb plate arranged between the metal strips is extended by a pipe pitch beyond the ends of the metal strips. 4. Dampferzeuger nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass an jedem Paar Blech­streifen an ihrem Endabschnitt nahe dem Eckbereich je ein Kammblech an dem aussenliegenden Rand des Blech­streifenpaares angeordnet und mit dem zugehörigen Blechstreifen verbunden ist.4. Steam generator according to one of claims 1 to 3, characterized in that on each pair of sheet metal strips at their end portion near the corner area a comb plate is arranged on the outer edge of the pair of sheet metal strips and is connected to the associated sheet metal strip. 5. Dampferzeuger nach Anspruch 3, dadurch gekennzeich­net, dass die der Wandmitte zugewendeten Endabschnit­te der Blechstreifen jedes Paares sich zum Kammblech hin verjüngen.5. Steam generator according to claim 3, characterized in that the end portions of the metal strips of the pair facing the center of the wall taper towards the comb plate. 6. Dampferzeuger nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass an jedem Paar Blech­streifen zwischen den Endabschnitten mindestens ein Stegblech vorgesehen ist, das mit den Blechstreifen und der Wand verbunden ist.6. Steam generator according to one of claims 1 to 5, characterized in that at least one web plate is provided on each pair of sheet metal strips between the end sections, which is connected to the sheet metal strips and the wall. 7. Dampferzeuger nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass zum Verbinden der Blechstreifenpaare mit den Gurtträgern an jedem Blechstreifen ein Kragenblech vorgesehen ist, an dem eine Lasche angelenkt ist.7. Steam generator according to one of claims 1 to 6, characterized in that a collar plate is provided for connecting the pairs of sheet metal strips to the belt supports on each sheet metal strip, to which a tab is articulated. 8. Dampferzeuger nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, dass die Länge jedes Blech­streifenpaares durch die Beziehung bestimmt ist:
L ≧ (I + 0,5) T + H - G,
worin bedeuten:
I Anzahl der Rohre, die mit den Kammblechen am Endabschnitt nahe dem Eckbereich verbunden sind,
T Rohrteilung in der Umfassungswand,
H Abstand zwischen zwei einander benachbarten Gurt­trägern der selben Umfassungswand und
G Dicke des zwischen den Blechstreifen eines Paares eingeschweissten Kammbleches, wenn ein Zugband aus einem Paar Blechstreifen gebildet ist, oder
Mittlerer Abstand zwischen zwei Paaren von Blech­streifen plus die Dicke eines Kammbleches (19), wenn ein Zugband aus zwei Paaren von Blechstreifen gebildet ist.8. Steam generator according to one of claims 2 to 7, characterized in that the length of each pair of sheet metal strips is determined by the relationship:
L ≧ (I + 0.5) T + H - G,
in which mean:
I number of pipes that are connected to the comb plates at the end section near the corner area,
T pipe division in the surrounding wall,
H distance between two adjacent belt carriers of the same peripheral wall and
G thickness of the comb plate welded between the metal strips of a pair, if a drawstring is formed from a pair of metal strips, or
Average distance between two pairs of sheet metal strips plus the thickness of a comb plate (19) if a drawstring is formed from two pairs of sheet metal strips.
EP90810588A 1989-08-30 1990-08-03 Steam generator with furnace Expired - Lifetime EP0415877B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3144/89 1989-08-30
CH314489 1989-08-30

Publications (2)

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EP0415877A1 true EP0415877A1 (en) 1991-03-06
EP0415877B1 EP0415877B1 (en) 1992-12-16

Family

ID=4249555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90810588A Expired - Lifetime EP0415877B1 (en) 1989-08-30 1990-08-03 Steam generator with furnace

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Country Link
EP (1) EP0415877B1 (en)
AT (1) ATE83548T1 (en)
DE (1) DE59000603D1 (en)
DK (1) DK0415877T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998028572A1 (en) * 1996-12-23 1998-07-02 Combustion Engineering, Inc. Buckstay corner assembly with buckstay extension plates for a boiler
US8379192B2 (en) 2006-02-01 2013-02-19 J&M Analytik Ag Apparatus for optical measurement of substance concentrations

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3007455A (en) * 1958-01-03 1961-11-07 Babcock & Wilcox Co Vapor generator wall and buckstay arrangement
US3357408A (en) * 1965-08-19 1967-12-12 Babcock & Wilcox Co Vapor generating apparatus
DE1576816A1 (en) * 1967-08-30 1970-05-06 Ver Kesselwerke Ag Bracing for steam generator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3007455A (en) * 1958-01-03 1961-11-07 Babcock & Wilcox Co Vapor generator wall and buckstay arrangement
US3357408A (en) * 1965-08-19 1967-12-12 Babcock & Wilcox Co Vapor generating apparatus
DE1576816A1 (en) * 1967-08-30 1970-05-06 Ver Kesselwerke Ag Bracing for steam generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998028572A1 (en) * 1996-12-23 1998-07-02 Combustion Engineering, Inc. Buckstay corner assembly with buckstay extension plates for a boiler
US8379192B2 (en) 2006-02-01 2013-02-19 J&M Analytik Ag Apparatus for optical measurement of substance concentrations

Also Published As

Publication number Publication date
ATE83548T1 (en) 1993-01-15
EP0415877B1 (en) 1992-12-16
DE59000603D1 (en) 1993-01-28
DK0415877T3 (en) 1993-02-15

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