EP0477849A1 - Cooling arrangement for a wall in the medial region of a fluidised bed boiler - Google Patents

Cooling arrangement for a wall in the medial region of a fluidised bed boiler Download PDF

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Publication number
EP0477849A1
EP0477849A1 EP91116223A EP91116223A EP0477849A1 EP 0477849 A1 EP0477849 A1 EP 0477849A1 EP 91116223 A EP91116223 A EP 91116223A EP 91116223 A EP91116223 A EP 91116223A EP 0477849 A1 EP0477849 A1 EP 0477849A1
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EP
European Patent Office
Prior art keywords
tubes
inverted
crawlers
edge
faces
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
EP91116223A
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German (de)
French (fr)
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EP0477849B1 (en
Inventor
Jean-Claude Semedard
Jean Aubry
Jean-Paul Tessier
Gérard Tondeur
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Stein Industrie SA
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Stein Industrie SA
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Publication date
Priority claimed from FR9011859A external-priority patent/FR2667133B1/en
Priority claimed from FR9103700A external-priority patent/FR2674614B1/en
Application filed by Stein Industrie SA filed Critical Stein Industrie SA
Publication of EP0477849A1 publication Critical patent/EP0477849A1/en
Application granted granted Critical
Publication of EP0477849B1 publication Critical patent/EP0477849B1/en
Anticipated expiration legal-status Critical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
    • F22B31/0015—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed for boilers of the water tube type
    • F22B31/003—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed for boilers of the water tube type with tubes surrounding the bed or with water tube wall partitions
    • 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
    • F22B37/40—Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles

Definitions

  • the present invention relates to a device for cooling the wall of a fluidized bed boiler hearth in a median zone of vertical cross section in the general shape of an inverted V junction between the lower parts in the trunk of an pyramid overturned above two parallel soles and an upper part of rectangular cross section, with front and rear faces parallel to the edge of the inverted V, and with lateral faces perpendicular to this edge, said wall being provided with heat exchange tubes traversed by water or a water and vapor emulsion, the inclined faces of the inverted V being provided with exchange tubes parallel to the lateral edges of the inverted V known as creeping.
  • the object of the present invention is to provide a device for cooling such a zone in natural circulation, using a continuous tubular system comprising no descending element.
  • the crawlers are connected to substantially horizontal heat exchange tubes arranged in the sides of the lower parts in the form of an inverted pyramid trunk in the extension of the inverted V and extending to near the faces. side where they open into vertical tubes fitted to the side faces of the fireplace.
  • all the tubes are arranged symmetrically with respect to the plane of symmetry parallel to the lateral faces of the hearth.
  • the heat exchange tubes of the median zone are connected to the tubes arranged in the sides of the lower parts in an inverted pyramid trunk by means of a collector placed under the wall of the median zone, the vertical edge of the inverted V.
  • the crawlers are connected by groups of n crawlers to the substantially horizontal heat exchange tubes, called connection tubes.
  • the groups of n crawlers are preferably connected to their respective connection tube at different heights, the different connection tubes being superimposed relative to each other in the inclined faces.
  • said heights are regularly increasing from the group of n crawlers closest to one of the lateral faces to the group of n crawlers closest to said plane of symmetry, the latter being interrupted near the edge of the zone.
  • the groups of n crawlers are connected two by two in sets of 2 n crawlers via the connection tubes , the latter being connected at their mutual junction to a corresponding vertical tube.
  • the junction between two connection tubes is produced by a hairpin-shaped extension of the connection tube of the group of n crawlers closest to one of the lateral faces of the hearth, the outlet of the hairpin being aligned with the connection tube of the another group of n crawlers.
  • FIG. 1 represents the general arrangement of the middle zone separating the two lower legs of a boiler hearth with two separate hearths comprising the device according to the invention.
  • Figure 2 shows on a larger scale the arrangement of the tubes in this area, according to the first variant.
  • Figure 3 shows on a larger scale the arrangement of the tubes in this area, according to the second variant.
  • the hearth has a front face 1, a rear face 2 and two lateral faces 3 and 4. Its two hearths are separated by an interval 7, so that the two lower parts of the jamb-shaped hearth have inclined flanks 8 and 9 connecting in the upper zone 10 along an edge 11, parallel to the front and rear faces of the hearth.
  • the manifold 12 for supplying water or an emulsion of water and cooling vapor is arranged in the plane of symmetry of the hearth parallel to its front and rear faces 1 and 2, away from the smoke of the foyer. It is connected on both sides to inlet tubes 13, 14 arranged on the sides 8, 9, called “vault crawlers", inclined at 24 ° to the vertical, and it itself feeds tubes such as 15 of connection with hairpin tubes such as 16, 18 arranged on the wall of the upper zone.
  • the tubes 16, 18 are connected in a known manner by welded fins, not shown, and are connected to vertical tubes such as 17, 19 which rise along the lateral faces 3, 4 of the hearth.
  • the manifold 12 is also connected in the vicinity of the plane of symmetry parallel to the lateral faces 3, 4 of the hearth by vertical tubes such as 20 to straight horizontal tubes such as 21, 22 diverging on either side of this plane of symmetry , and arranged in the area 10 near the upper edge 11, which open into the vertical tubes 23, 24 from the side faces.
  • the tubes such as 21, 22 are preferably arranged on face portions making a greater angle, for example of 550, with the vertical, so that the edge 11 of FIG. 1 is then a virtual edge.
  • These tubes are also connected by fins, not shown.
  • the device according to the second variant is described in FIG. 3.
  • the inlet tubes 13, 14, called vault crawlers, inclined at 24 relative to the vertical, are arranged on the surface of the inclined sides 8, 9.
  • the ramps 13, 14 are connected by group of n ramps.
  • the crawlers are connected in groups of 3.
  • the number of crawlers per group is defined as a function of the desired flow rate at the outlet in the vertical tubes 17 on the side walls of the hearth.
  • the arrangement of the tubes is symmetrical relative to the central vertical plane parallel to the lateral faces 3, 4 of the hearth, half of the ramps 13, 14 being connected to vertical tubes 17 of the lateral face 3, the other half being connected to vertical tubes 17 on the other side face 4.
  • the trace of this plane of symmetry is symbolized by the line AA in FIG. 3.
  • the ramps 13, 14 are interrupted in groups of three, at different heights, the group closest to the plane symbolized by A-A going as far as the edge 11 of zone 10.
  • the horizontal tubes 12 are, in turn, connected two by two before being connected to a vertical tube 17.
  • This connection is achieved by hairpin extensions 160 of the lower tube 120 of each pair of adjacent tubes 120.
  • This extension 160 takes place outside of zone 10. Its purpose is, on the one hand, to allow the use of a conventional T-connector at the connection of the corresponding vertical tube 17, on the other hand '' balance the lengths and flows arriving at this connection.
  • the tubes are connected in the plane by welded fins, not shown, except in the overflow zone of zone 10, namely the hairpins 160.
  • the zone 10 having a height of approximately 2.7 m, the pitch between the ramps 13, 14 is approximately 88 mm, their diameter being approximately 44.5 mm; the pitch between horizontal tubes 120 is approximately 94mm and that between vertical tubes approximately 76.5mm, the diameter of the latter being approximately 63.5mm.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

Cooling arrangement for the wall of a fluidised-bed boiler furnace in a medial region of vertical cross-section having the general form of an inverted V of junction between lower portions in the form of an upturned truncated pyramid above two parallel sole plates (5, 6) and an upper portion of rectangular cross-section, having front (1) and rear (2) faces parallel to the ridge edge (11) of the inverted V and lateral faces (3, 4) perpendicular to this ridge edge, the said wall being fitted with heat-exchange tubes traversed by water or an emulsion of water and vapour, characterised in that the heat-exchange tubes (16, 18, 21, 22) are essentially horizontal and disposed in the side walls of the lower portions in the form of an upturned truncated pyramid in the continuation of the inverted V, and they emerge into tubes (17, 19, 23, 24) covering the lateral faces perpendicular to its ridge edge. <??>Possibility of effecting cooling by natural circulation. <IMAGE>

Description

La présente invention concerne un dispositif de refroidissement de la paroi d'un foyer de chaudière à lit fluidisé dans une zone médiane de section droite verticale en forme générale de V renversé de jonction entre des parties inférieures en tronc de pyramide renversé au-dessus de deux soles parallèles et une partie supérieure de section droite rectangulaire, à faces avant et arrière parallèles à l'arête du V renversé, et à faces latérales perpendiculaires à cette arête, ladite paroi étant munie de tubes d'échange de chaleur parcourus par de l'eau ou une émulsion d'eau et de vapeur, les faces inclinées du V renversé étant pourvues de tubes d'échange parallèles aux arêtes latérales du V renversé dits rampants.The present invention relates to a device for cooling the wall of a fluidized bed boiler hearth in a median zone of vertical cross section in the general shape of an inverted V junction between the lower parts in the trunk of an pyramid overturned above two parallel soles and an upper part of rectangular cross section, with front and rear faces parallel to the edge of the inverted V, and with lateral faces perpendicular to this edge, said wall being provided with heat exchange tubes traversed by water or a water and vapor emulsion, the inclined faces of the inverted V being provided with exchange tubes parallel to the lateral edges of the inverted V known as creeping.

On n'avait jusqu'ici pas trouvé de solution satisfaisante pour assurer le refroidissement de cette zone en circulation naturelle de l'eau et de l'émulsion d'eau et de vapeur à réchauffer et vaporiser. Il fallait donc y disposer des tubes alimentés à l'aide de pompes en circulation forcée à partir des tubes tapissant les parois verticales du foyer par des tronçons comportant une partie descendante.Until now, no satisfactory solution has been found to ensure the cooling of this zone in natural circulation of water and of the emulsion of water and steam to be heated and vaporized. It was therefore necessary to have there tubes supplied with the aid of pumps in forced circulation from the tubes lining the vertical walls of the hearth by sections comprising a descending part.

La présente invention a pour objet de procurer un dispositif de refroidissement d'une telle zone en circulation naturelle, à l'aide d'un système tubulaire continu ne comportant aucun élément descendant.The object of the present invention is to provide a device for cooling such a zone in natural circulation, using a continuous tubular system comprising no descending element.

Pour ce faire, selon l'invention, les rampants sont reliés à des tubes d'échange de chaleur sensiblement horizontaux disposés dans les flancs des parties inférieures en tronc de pyramide renversée dans le prolongement du V inversé et se prolongeant jusqu'à proximité des faces latérales où ils débouchent dans des tubes verticaux équipant les faces latérales du foyer.To do this, according to the invention, the crawlers are connected to substantially horizontal heat exchange tubes arranged in the sides of the lower parts in the form of an inverted pyramid trunk in the extension of the inverted V and extending to near the faces. side where they open into vertical tubes fitted to the side faces of the fireplace.

Afin d'équiper de façon uniforme les deux faces latérales, de préférence, tous les tubes sont disposés de façon symétrique par rapport au plan de symétrie parallèle aux faces latérales du foyer.In order to uniformly equip the two lateral faces, preferably, all the tubes are arranged symmetrically with respect to the plane of symmetry parallel to the lateral faces of the hearth.

Selon une première variante, les tubes d'échange de chaleur de la zone médiane sont reliés aux tubes disposés dans les flancs des parties inférieures en tronc de pyramide renversé par l'intermédiaire d'un collecteur disposé sous la paroi de la zone médiane, à la verticale de l'arête du V inversé.According to a first variant, the heat exchange tubes of the median zone are connected to the tubes arranged in the sides of the lower parts in an inverted pyramid trunk by means of a collector placed under the wall of the median zone, the vertical edge of the inverted V.

Dans ce cas, le dispositif répond en outre de préférence à au moins l'une des caractéristiques suivantes :

  • - Au moins la majeure partie des tubes sont en forme d'épingle à cheveux.
  • - Certains des tubes, disposés au voisinage de l'arête du V inversé, sont rectilignes et alimentés par leur milieu.
  • - Les tubes en épingle à cheveux sont alimentés par leurs extrémités au voisinage des faces latérales du foyer.
  • - Les flancs de la partie de la zone médiane les plus proches de l'arête font un angle plus élevé avec un plan vertical que ceux de la partie de la zone médiane plus éloignée de l'arête.
In this case, the device also preferably responds to at least one of the following characteristics:
  • - At least most of the tubes are shaped like a hairpin.
  • - Some of the tubes, arranged in the vicinity of the edge of the inverted V, are rectilinear and supplied by their center.
  • - The hairpin tubes are supplied by their ends in the vicinity of the side faces of the hearth.
  • - The sides of the part of the median zone closest to the edge make a higher angle with a vertical plane than those of the part of the median zone more distant from the edge.

Selon une seconde variante, les rampants sont reliés par groupes de n rampants aux tubes d'échange de chaleur sensiblement horizontaux dits tubes de raccordement.According to a second variant, the crawlers are connected by groups of n crawlers to the substantially horizontal heat exchange tubes, called connection tubes.

Afin d'obtenir une répartition uniforme des tubes verticaux sur chaque face latérale et des tubes de raccordement sur les faces inclinées, les groupes de n rampants sont, de préférence, reliés à leur tube de raccordement respectif à différentes hauteurs, les différents tubes de raccordement étant superposés les uns par rapport aux autres dans les faces inclinées.In order to obtain a uniform distribution of the vertical tubes on each lateral face and of the connection tubes on the inclined faces, the groups of n crawlers are preferably connected to their respective connection tube at different heights, the different connection tubes being superimposed relative to each other in the inclined faces.

Plus précisément, lesdites hauteurs sont régulièrement croissantes du groupe de n rampants le plus proche d'une des faces latérales au groupe de n rampants le plus proche dudit plan de symétrie, ce dernier étant interrompu à proximité de l'arête de la zone.More precisely, said heights are regularly increasing from the group of n crawlers closest to one of the lateral faces to the group of n crawlers closest to said plane of symmetry, the latter being interrupted near the edge of the zone.

Pour que le pas entre tubes verticaux soit suffisant compte tenu des ailettes soudées reliant les tubes de façon connue, selon une caractéristique particulière, les groupes de n rampants sont reliés deux à deux en ensembles de 2 n rampants par l'intermédiaire des tubes de raccordement, ces derniers étant connectés à leur jonction mutuelle à un tube vertical correspondant.So that the pitch between vertical tubes is sufficient taking into account the welded fins connecting the tubes in a known manner, according to a particular characteristic, the groups of n crawlers are connected two by two in sets of 2 n crawlers via the connection tubes , the latter being connected at their mutual junction to a corresponding vertical tube.

Enfin, afin de permettre la réalisation du dispositif à l'aide de pièces de raccord de tubes standards en T ou en L et obtenir un équilibrage optimal des flux, selon une autre caractéristique de l'invention, la jonction entre deux tubes de raccordement est réalisé par un prolongement en forme d'épingle à cheveux du tube de raccordement du groupe de n rampants le plus proche d'une des faces latérales du foyer, la sortie de l'épingle à cheveux étant alignée avec le tube de raccordement de l'autre groupe de n rampants.Finally, in order to allow the device to be produced using standard T or L tube connection pieces and to obtain optimum flow balancing, according to another characteristic of the invention, the junction between two connection tubes is produced by a hairpin-shaped extension of the connection tube of the group of n crawlers closest to one of the lateral faces of the hearth, the outlet of the hairpin being aligned with the connection tube of the another group of n crawlers.

L'invention est exposée ci-après plus en détail à l'aide de dessins représentant seulement un mode d'exécution.The invention is set out below in more detail with the aid of drawings representing only one embodiment.

La figure 1 représente la disposition générale de la zone médiane séparant les deux jambages inférieurs d'un foyer de chaudière à deux soles séparés comportant le dispositif conforme à l'invention.FIG. 1 represents the general arrangement of the middle zone separating the two lower legs of a boiler hearth with two separate hearths comprising the device according to the invention.

La figure 2 représente à plus grande échelle la disposition des tubes dans cette zone, selon la première variante.Figure 2 shows on a larger scale the arrangement of the tubes in this area, according to the first variant.

La figure 3 représente à plus grande échelle la disposition des tubes dans cette zone, selon la seconde variante.Figure 3 shows on a larger scale the arrangement of the tubes in this area, according to the second variant.

Sur la figure 1, le foyer comporte une face avant 1, une face arrière 2 et deux faces latérales 3 et 4. Ses deux soles sont séparées par un intervalle 7, de sorte que les deux parties inférieures du foyer en forme de jambage comportent des flancs inclinés 8 et 9 se raccordant dans la zone supérieure 10 le long d'une arête 11, parallèle aux faces avant et arrière du foyer.In FIG. 1, the hearth has a front face 1, a rear face 2 and two lateral faces 3 and 4. Its two hearths are separated by an interval 7, so that the two lower parts of the jamb-shaped hearth have inclined flanks 8 and 9 connecting in the upper zone 10 along an edge 11, parallel to the front and rear faces of the hearth.

Dans la figure 2, le collecteur 12 d'alimentation en eau ou émulsion d'eau et de vapeur de refroidissement est disposé dans le plan de symétrie du foyer parallèle à ses faces avant et arrière 1 et 2, à l'abri des fumées du foyer. Il est relié de part et d'autre à des tubes d'arrivée 13, 14 disposés sur les flancs 8, 9, appelés "rampants de voûte", inclinés à 24° sur la verticale, et il alimente lui-même des tubes tels que 15 de liaison avec des tubes en épingle à cheveux tels que 16, 18 disposés sur la paroi de la zone supérieure. Les tubes 16, 18 sont reliés de façon connue par des ailettes soudées, non représentées, et se raccordent à des tubes verticaux tels que 17, 19 qui s'élèvent le long des faces latérales 3, 4 du foyer.In FIG. 2, the manifold 12 for supplying water or an emulsion of water and cooling vapor is arranged in the plane of symmetry of the hearth parallel to its front and rear faces 1 and 2, away from the smoke of the foyer. It is connected on both sides to inlet tubes 13, 14 arranged on the sides 8, 9, called "vault crawlers", inclined at 24 ° to the vertical, and it itself feeds tubes such as 15 of connection with hairpin tubes such as 16, 18 arranged on the wall of the upper zone. The tubes 16, 18 are connected in a known manner by welded fins, not shown, and are connected to vertical tubes such as 17, 19 which rise along the lateral faces 3, 4 of the hearth.

Le collecteur 12 est également relié au voisinage du plan de symétrie parallèle aux faces latérales 3, 4 du foyer par des tubes verticaux tels que 20 à des tubes droits horizontaux tels que 21, 22 divergeant de part et d'autre de ce plan de symétrie, et disposés dans la zone 10 près de l'arête supérieure 11, qui débouchent dans les tubes verticaux 23, 24 des faces latérales. Les tubes tels que 21, 22 sont disposés de préférence sur des portions de face faisant un angle plus élevé, par exemple de 550, avec la verticale, de sorte que l'arête 11 de la figure 1 est alors une arête virtuelle. Ces tubes sont également reliés par des ailettes, non représentées.The manifold 12 is also connected in the vicinity of the plane of symmetry parallel to the lateral faces 3, 4 of the hearth by vertical tubes such as 20 to straight horizontal tubes such as 21, 22 diverging on either side of this plane of symmetry , and arranged in the area 10 near the upper edge 11, which open into the vertical tubes 23, 24 from the side faces. The tubes such as 21, 22 are preferably arranged on face portions making a greater angle, for example of 550, with the vertical, so that the edge 11 of FIG. 1 is then a virtual edge. These tubes are also connected by fins, not shown.

Le dispositif conforme à la seconde variante est décrit sur la figure 3.The device according to the second variant is described in FIG. 3.

Les tubes d'arrivée 13, 14 appelés rampants de voûte, inclinés à 24 par rapport à la verticale, sont disposés sur la surface des flancs inclinés 8, 9.The inlet tubes 13, 14, called vault crawlers, inclined at 24 relative to the vertical, are arranged on the surface of the inclined sides 8, 9.

Pour ce faire, les rampants 13, 14 sont raccordés par groupe de n rampants. Selon l'exemple représenté, les rampants sont raccordés par groupe de 3. Le nombre de rampants par groupe est défini en fonction du débit souhaité en sortie dans les tubes verticaux 17 sur les parois latérales du foyer.To do this, the ramps 13, 14 are connected by group of n ramps. According to the example shown, the crawlers are connected in groups of 3. The number of crawlers per group is defined as a function of the desired flow rate at the outlet in the vertical tubes 17 on the side walls of the hearth.

L'agencement des tubes est symétrique par rapport au plan vertical central parallèle aux faces latérales 3,4 du foyer, la moitié des rampants 13, 14 étant connectée à des tubes verticaux 17 de la face latérale 3, l'autre moitié étant connectée à des tubes verticaux 17 de l'autre face latérale 4. La trace de ce plan de symétrie est symbolisée par la ligne A-A sur la figure 3.The arrangement of the tubes is symmetrical relative to the central vertical plane parallel to the lateral faces 3, 4 of the hearth, half of the ramps 13, 14 being connected to vertical tubes 17 of the lateral face 3, the other half being connected to vertical tubes 17 on the other side face 4. The trace of this plane of symmetry is symbolized by the line AA in FIG. 3.

Les rampants 13, 14 sont interrompus par groupes de trois, à des hauteurs différentes, le groupe le plus proche du plan symbolisé par A-A allant jusqu'à proximité de l'arête 11 de la zone 10.The ramps 13, 14 are interrupted in groups of three, at different heights, the group closest to the plane symbolized by A-A going as far as the edge 11 of zone 10.

Au niveau de leur interruption, ils sont raccordés, de préférence par des raccords classiques en T et en L, à des tubes 120 sensiblement horizontaux disposés également dans les faces inclinées 8, 9 de la zone 10. Ces raccords sont réalisés de façon à obtenir un pas constant entre les tubes 120 superposés dans ces faces inclinées.At their interruption, they are connected, preferably by conventional T and L connections, to substantially horizontal tubes 120 also arranged in the inclined faces 8, 9 of the zone 10. These connections are made so as to obtain a constant pitch between the tubes 120 superimposed in these inclined faces.

Afin d'obtenir un pas suffisant entre les tubes verticaux 17, les tubes horizontaux 12 sont, quant à eux, reliés deux par deux avant d'être connectés à un tube vertical 17.In order to obtain a sufficient pitch between the vertical tubes 17, the horizontal tubes 12 are, in turn, connected two by two before being connected to a vertical tube 17.

Cette liaison est réalisée grâce à des prolongements en épingle à cheveux 160 du tube 120 inférieur de chaque paire de tubes 120 adjacents. Ce prolongement 160 se fait à l'extérieur de la zone 10. Il a pour but d'une part de permettre l'utilisation d'un raccord en T classique au niveau de la connexion du tube vertical 17 correspondant, d'autre part d'équilibrer les longueurs et les flux arrivant à cette connexion.This connection is achieved by hairpin extensions 160 of the lower tube 120 of each pair of adjacent tubes 120. This extension 160 takes place outside of zone 10. Its purpose is, on the one hand, to allow the use of a conventional T-connector at the connection of the corresponding vertical tube 17, on the other hand '' balance the lengths and flows arriving at this connection.

De façon connue, les tubes sont reliés dans le plan par des ailettes soudées, non représentées, sauf dans la zone de débordement de la zone 10, à savoir les épingles à cheveux 160.In known manner, the tubes are connected in the plane by welded fins, not shown, except in the overflow zone of zone 10, namely the hairpins 160.

A titre d'exemple, la zone 10 ayant une hauteur d'environ 2,7m, le pas entre rampants 13, 14 est d'environ 88mm, leur diamètre étant d'environ de 44,5mm ; le pas entre tubes horizontaux 120 est d'environ 94mm et celui entre tubes verticaux d'environ 76,5mm, le diamètre de ces derniers étant d'environ 63,5mm.By way of example, the zone 10 having a height of approximately 2.7 m, the pitch between the ramps 13, 14 is approximately 88 mm, their diameter being approximately 44.5 mm; the pitch between horizontal tubes 120 is approximately 94mm and that between vertical tubes approximately 76.5mm, the diameter of the latter being approximately 63.5mm.

Ces dispositions des tubes d'échange de chaleur dans la partie supérieure de la zone en forme de V renversé séparant les deux parties inférieures du foyer permettent d'assurer une circulation naturelle de l'eau ou de l'émulsion d'eau et de vapeur dans les tubes, tout en protégeant complètement les parois correspondantes et le collecteur d'alimentation du rayonnement du foyer.These arrangements of the heat exchange tubes in the upper part of the inverted V-shaped zone separating the two lower parts of the hearth allow natural circulation of water or of the emulsion of water and steam to be ensured. in the tubes, while completely protecting the corresponding walls and the supply collector from the radiation of the hearth.

Claims (12)

1. Dispositif de refroidissement de la paroi d'un foyer de chaudière à lit fluidisé dans une zone médiane de section droite verticale en forme générale de V renversé de jonction entre les parties inférieures en tronc de pyramide renversé au-dessus de deux soles parallèles (5, 6) et une partie supérieure de section droite rectangulaire, à face avant (1) et face arrière (2) parallèles à l'arête (11) du V renversé et à faces latérales (3, 4) perpendiculaires à cette arête, ladite paroi étant munie de tubes d'échange de chaleur parcourus par de l'eau ou une émulsion d'eau et de vapeur, les faces inclinées (8, 9) du V renversé étant pourvues de tubes d'échange (13, 14) parallèles aux arêtes latérales du Y renversé dits rampants, dispositif caractérisé en ce que les rampants (13, 14) sont reliés à des tubes d'échange de chaleur sensiblement horizontaux (16, 12, 21, 22, 120) disposés dans les flancs des parties inférieures en tronc de pyramide renversée dans le prolongement du V inversé et se prolongeant jusqu'à proximité des faces latérales (3, 4) où ils débouchent dans des tubes verticaux (17, 19, 23, 24) équipant les faces latérales (3, 4) du foyer.1. Cooling device for the wall of a fluidized bed boiler hearth in a median section of vertical cross section in the general shape of an inverted V junction between the lower parts in the trunk of an inverted pyramid above two parallel hearths ( 5, 6) and an upper part of rectangular cross section, with front face (1) and rear face (2) parallel to the edge (11) of the inverted V and with lateral faces (3, 4) perpendicular to this edge, said wall being provided with heat exchange tubes traversed by water or a water and steam emulsion, the inclined faces (8, 9) of the inverted V being provided with exchange tubes (13, 14) parallel to lateral edges of the inverted Y so-called creepers, device characterized in that the creepers (13, 14) are connected to substantially horizontal heat exchange tubes (16, 12, 21, 22, 120) arranged in the sides of the lower parts in an inverted pyramid trunk in the extension of the inverted V and extending to near the side faces (3, 4) where they open into vertical tubes (17, 19, 23, 24) equipping the side faces (3, 4 ) fireplace. 2. Dispositif selon la revendication 1, caractérisé en ce que tous les tubes sont disposés de façon symétrique par rapport au plan de symétrie parallèle aux faces latérales (3, 4) du foyer.2. Device according to claim 1, characterized in that all the tubes are arranged symmetrically with respect to the plane of symmetry parallel to the lateral faces (3, 4) of the hearth. 3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les tubes d'échange de chaleur de la zone médiane sont reliés aux tubes disposés dans les flancs des parties inférieures en tronc de pyramide renversé par l'intermédiaire d'un collecteur (12) disposé sous la paroi de la zone médiane, à la verticale de l'arête du V inversé.3. Device according to claim 1 or 2, characterized in that the heat exchange tubes of the middle zone are connected to the tubes arranged in the sides of the lower parts in the trunk of an inverted pyramid by means of a collector ( 12) arranged under the wall of the middle zone, vertical to the edge of the inverted V. 4. Dispositif selon la revendication 1, 2 ou 3, caractérisé en ce qu'au moins la majeure partie des tubes (16, 18) sont en forme d'épingle à cheveux.4. Device according to claim 1, 2 or 3, characterized in that at least the major part of the tubes (16, 18) are in the form of a hairpin. 5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que certains des tubes (21, 22), disposés au voisinage de l'arête du V inversé, sont rectilignes et alimentés par leur milieu.5. Device according to any one of the preceding claims, characterized in that some of the tubes (21, 22), disposed in the vicinity of the edge of the inverted V, are rectilinear and supplied by their center. 6. Dispositif selon les revendications 3 et 4, caractérisé en ce que les tubes en épingle à cheveux (16, 18) sont alimentés par leurs extrémités au voisinage des faces latérales du foyer.6. Device according to claims 3 and 4, characterized in that the hairpin tubes (16, 18) are fed by their ends in the vicinity of the side faces of the hearth. 7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les flancs de la partie (10) de la zone médiane les plus proches de l'arête font un angle plus élevé avec un plan vertical que ceux de la partie de la zone médiane plus éloignée de l'arête.7. Device according to any one of the preceding claims, characterized in that the flanks of the part (10) of the middle zone closest to the edge form a higher angle with a vertical plane than those of the part of the middle zone further from the edge. 8. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les rampants (13, 14) sont reliés par groupes de n rampants (13, 14) aux tubes d'échange de chaleur sensiblement horizontaux (120) dits tubes de raccordement.8. Device according to claim 1 or 2, characterized in that the ramps (13, 14) are connected by groups of n ramps (13, 14) to the substantially horizontal heat exchange tubes (120) called connection tubes. 9. Dispositif selon la revendication 8, caractérisé en ce que les groupes de n rampants (13, 14) sont reliés à leur tube de raccordement (120) respectif à différentes hauteurs, les différents tubes de raccordement (120) étant superposés les uns par rapport aux autres dans les faces inclinées (8, 9).9. Device according to claim 8, characterized in that the groups of n crawlers (13, 14) are connected to their respective connecting tube (120) at different heights, the different connecting tubes (120) being superposed by one compared to the others in the inclined faces (8, 9). 10. Dispositif selon la revendication 9, caractérisé en ce que lesdites hauteurs sont régulièrement croissantes du groupe de n rampants le plus proche d'une des faces latérales (3 ou 4) au groupe de n rampants le plus proche dudit plan de symétrie, ce dernier allant jusqu'à proximité de l'arête (11) de la zone (10).10. Device according to claim 9, characterized in that said heights are regularly increasing from the group of n crawlers closest to one of the lateral faces (3 or 4) to the group of n crawlers closest to said plane of symmetry, this the latter going as far as the edge (11) of the zone (10). 11. Dispositif selon la revendication 9 ou 10, caractérisé en ce que les groupes de n rampants (13, 14) sont reliés deux à deux en ensembles de 2 n rampants par l'intermédiaire des tubes de raccordement (120), ces derniers étant connectés à leur jonction mutuelle à un tube vertical (17) correspondant.11. Device according to claim 9 or 10, characterized in that the groups of n crawlers (13, 14) are connected two by two in sets of 2 n crawlers via the connection tubes (120), the latter being connected at their mutual junction to a corresponding vertical tube (17). 12. Dispositif selon la revendication 11, caractérisé en ce que cette jonction entre deux tubes de raccordement (120) est réalisé par un prolongement en forme d'épingle à cheveux (160) du tube de raccordement (120) du groupe de n rampants (13, 14) le plus proche d'une des faces latérales (3, 4) du foyer, la sortie de l'épingle à cheveux (160) étant alignée avec le tube de raccordement (120) de l'autre groupe de n rampants (13, 14).12. Device according to claim 11, characterized in that this junction between two connection tubes (120) is produced by a hairpin-shaped extension (160) of the connection tube (120) of the group of n crawlers ( 13, 14) closest to one of the lateral faces (3, 4) of the hearth, the outlet of the hairpin (160) being aligned with the connection tube (120) of the other group of n crawlers (13, 14).
EP91116223A 1990-09-26 1991-09-24 Cooling arrangement for a wall in the medial region of a fluidised bed boiler Expired - Lifetime EP0477849B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9011859A FR2667133B1 (en) 1990-09-26 1990-09-26 DEVICE FOR COOLING THE WALL OF A FLUIDIZED BED BOILER FIREPLACE IN A MEDIAN AREA.
FR9011859 1990-09-26
FR9103700 1991-03-27
FR9103700A FR2674614B1 (en) 1991-03-27 1991-03-27 DEVICE FOR COOLING THE WALL OF A FLUIDIZED BED BOILER FIREPLACE IN A MEDIAN AREA.

Publications (2)

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EP0477849A1 true EP0477849A1 (en) 1992-04-01
EP0477849B1 EP0477849B1 (en) 1995-01-18

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EP91116223A Expired - Lifetime EP0477849B1 (en) 1990-09-26 1991-09-24 Cooling arrangement for a wall in the medial region of a fluidised bed boiler

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EP (1) EP0477849B1 (en)
CN (1) CN1050413C (en)
CA (1) CA2052230C (en)
DE (1) DE69106822T2 (en)
ES (1) ES2067823T3 (en)
FI (1) FI97315C (en)

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EP0864834A1 (en) * 1997-03-13 1998-09-16 GEC ALSTHOM Stein Industrie Heat exchanger with dense fluidized bed combined with a reactor with circulating fluidized bed
FR2837561A1 (en) * 2002-03-25 2003-09-26 Alstom Switzerland Ltd Fluidized bed boiler firebox has two floors separated by spacer and several vertical heat exchanger tube panels with tubes connected to manifold
CN101818894A (en) * 2010-04-29 2010-09-01 清华大学 Circulating fluidized bed boiler

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FR2757930B1 (en) * 1997-01-02 1999-02-26 Gec Alsthom Stein Ind IMPROVED SOLE LFC BOILER FIREPLACE
CN101696798B (en) * 2009-05-18 2011-05-04 西安热工研究院有限公司 Compact circulating fluidized bed boiler with special division wall
FI124376B (en) * 2010-01-15 2014-07-31 Foster Wheeler Energia Oy STEAM BOILER
DE102010028426A1 (en) * 2010-04-30 2011-11-03 Siemens Aktiengesellschaft steam generator
CN102997231B (en) * 2012-12-31 2015-06-24 中国科学院工程热物理研究所 Large circulating fluidized bed boiler, air distribution device and air distribution device assembly

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
EP0864834A1 (en) * 1997-03-13 1998-09-16 GEC ALSTHOM Stein Industrie Heat exchanger with dense fluidized bed combined with a reactor with circulating fluidized bed
FR2760829A1 (en) * 1997-03-13 1998-09-18 Gec Alsthom Stein Ind DENSE FLUIDIZED BED EXCHANGER FOR ASSOCIATED WITH A CIRCULATING FLUIDIZED BED REACTOR
US5979367A (en) * 1997-03-13 1999-11-09 Gec Alsthom Stein Industrie Dense fluidized bed exchanger to be associated with a circulating fluidized bed reactor
FR2837561A1 (en) * 2002-03-25 2003-09-26 Alstom Switzerland Ltd Fluidized bed boiler firebox has two floors separated by spacer and several vertical heat exchanger tube panels with tubes connected to manifold
WO2003081128A1 (en) * 2002-03-25 2003-10-02 Alstom (Switzerland) Ltd. Fluidized bed boiler furnace comprising two hearths separated by an inside leg area
US7152537B2 (en) 2002-03-25 2006-12-26 Alstom (Switzerland) Ltd Fluidized bed boiler furnace comprising two hearths separated by an inside leg area
CN101818894A (en) * 2010-04-29 2010-09-01 清华大学 Circulating fluidized bed boiler
CN101818894B (en) * 2010-04-29 2011-10-26 清华大学 Circulating fluidized bed boiler

Also Published As

Publication number Publication date
FI914456A0 (en) 1991-09-23
CN1061653A (en) 1992-06-03
DE69106822D1 (en) 1995-03-02
FI97315C (en) 1996-11-25
CA2052230C (en) 1995-01-17
DE69106822T2 (en) 1995-05-18
ES2067823T3 (en) 1995-04-01
FI97315B (en) 1996-08-15
US5168819A (en) 1992-12-08
CA2052230A1 (en) 1992-03-27
EP0477849B1 (en) 1995-01-18
FI914456A (en) 1992-03-27
CN1050413C (en) 2000-03-15

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