EP1490629B1 - Fluidized bed boiler furnace comprising two hearths separated by an inside leg area - Google Patents

Fluidized bed boiler furnace comprising two hearths separated by an inside leg area Download PDF

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Publication number
EP1490629B1
EP1490629B1 EP03727571A EP03727571A EP1490629B1 EP 1490629 B1 EP1490629 B1 EP 1490629B1 EP 03727571 A EP03727571 A EP 03727571A EP 03727571 A EP03727571 A EP 03727571A EP 1490629 B1 EP1490629 B1 EP 1490629B1
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EP
European Patent Office
Prior art keywords
tubes
panel
crotch
panels
fluidized bed
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03727571A
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German (de)
French (fr)
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EP1490629A1 (en
Inventor
Christian Enault
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General Electric Technology GmbH
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Alstom Technology AG
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Publication date
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Publication of EP1490629A1 publication Critical patent/EP1490629A1/en
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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
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/005—Fluidised bed combustion apparatus comprising two or more beds

Definitions

  • the invention relates to a furnace for a fluidized bed boiler comprising two soles separated by a crotch at the bottom of the furnace, and at least one panel of heat exchange tubes.
  • a fireplace of the type indicated above for a circulating fluidized bed boiler is known in particular from the patent application.
  • EP-A-0 477 849 It is known to install inside a fluidized bed boiler furnace one or more panels of heat exchange tubes traversed by a heat transfer fluid such as water or an emulsion of water and steam - as described for example in the document WO-A-98,25074 .
  • Each panel of tubes is arranged conventionally perpendicular to the side walls of the fireplace by being fixed or not.
  • a hearth comprising two soles separated by a crotch
  • such an arrangement has the disadvantage of limiting the number of panels that can be installed on the side walls of the fireplace without hindering the flow of particles to the cyclones provided on these side walls.
  • the object of the invention is to propose another arrangement of heat exchange tube panels that takes advantage of the structure of a fireplace having in its lower part a crotch.
  • the furnace for a fluidized bed boiler according to the invention is characterized in that the panel of heat exchange tubes is disposed vertically above said crotch and perpendicular to the longitudinal direction of said soles. In this way, it does not interfere with the load balance in the home.
  • a plurality of panels may be arranged in a row on the top of the crotch being spaced regularly from each other in said longitudinal direction so as to leave sufficient circulation space for the particles does not create pressure imbalances at the same time. inside the fireplace.
  • the tubes forming a panel are an extension of the tubes forming the crotch which prevents the formation of crossings in the crotch.
  • a fireplace according to the invention may also comprise an alternation of panels whose tubes are an extension of the tubes forming the crotch and panels whose tubes are connected to a collector disposed under the crotch. So there will be panels powered by the fluid flowing in the walls of the fireplace and panels fed either by the same fluid or by another heat transfer fluid.
  • each panel of tubes is fixed to the ceiling of the hearth so that the panel of tubes can, if necessary, be placed in tension between the crotch and the ceiling of the hearth to limit the vibrations produced by the circulation of the fluid. the tubes of the panels.
  • the figure 1 is a very schematic view of a fireplace according to the invention in longitudinal section showing a panel of tubes disposed on the crotch of the hearth.
  • the figure 2 is a very schematic view of the top of the fireplace showing the arrangement of several panels of tubes on the crotch of the hearth.
  • the figure 3 illustrates very schematically the formation of a panel of tubes with the tubes forming the crotch of the hearth.
  • the fireplace shown on the figure 1 is a furnace for circulating fluidized bed (CFL) boiler whose lower part forms a crotch 1 separating two soles 2.3 from the hearth. Outputs from the fireplace to cyclones are indicated by references 4,5.
  • the exits to the cyclones are usually arranged on the side walls of the hearth and a crotch fire may have four or more outlets to the cyclones disposed on either side of the crotch.
  • the fireplace according to the invention is equipped with at least one panel 6 of heat exchange tubes which is arranged vertically on the top of the crotch 1 and perpendicularly to the longitudinal direction A of the soles 2 and 3 which does not interfere not the flow of gases and particles indicated by the arrows GP and does not create pressure imbalance in the home.
  • Each panel 6 of heat exchange tubes is fixed to the ceiling 7 of the fireplace and is placed in tension between the ceiling and the crotch to prevent the unwanted vibrations of the tubes of the panel during operation of the fireplace.
  • FIG. 1 there is shown an inlet manifold 8 placed under the crotch 6 and an outlet manifold 9 placed on top of the ceiling 7 of the hearth to which the tubes of the panel 6 are connected.
  • a large number of panels 6 of tubes can be arranged in a row on the top of the crotch 1 being regularly spaced from each other along the crotch 1.
  • the tubes forming the heat exchange panels 6 may be an extension of the tubes forming the crotch of the hearth. It is also possible to have an alternation of panels 6 whose tubes are an extension of the tubes forming the crotch of the fireplace and panels whose tubes are connected to the inlet manifold 8.
  • the figure 3 illustrates a panel 6A (seen from above), the tubes 10 are an extension of the tubes 11 forming the crotch 1 and a panel 6B (seen from above), the tubes 12 are connected to the inlet manifold 8 (not shown).
  • the topology of the tubes forming the crotch 1 shown on the figure 3 is only an example of the invention.
  • the arrangement of the panels 6 according to the invention is suitable both for a crotch plane as illustrated on the figure 1 that an inverted V-shaped crotch. Furthermore, in the example shown, the outputs 4.5 to the cyclones are located on the side faces 13,14; they could be located on the transverse side faces 15 and 16

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Information Transfer Between Computers (AREA)
  • Radio Relay Systems (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The fluidized bed firebox has two floors (2,3) separated by a spacer (1) in the lower part of the firebox. There are several heat exchanger tube panels (6) located vertically above the spacer and perpendicular to the longitudinal direction (A) of the floors. The tubes are connected to a manifold (8) under the spacer.

Description

L'invention concerne un foyer de chaudière à lit fluidisé comprenant deux soles séparées par un entrejambe à la partie inférieure du foyer, et au moins un panneau de tubes d'échange de chaleur.The invention relates to a furnace for a fluidized bed boiler comprising two soles separated by a crotch at the bottom of the furnace, and at least one panel of heat exchange tubes.

Un foyer du genre indiqué ci-dessus pour chaudière à lit fluidisé circulant est connu notamment de la demande de brevet EP-A-0 477 849 . Il est connu d'installer à l'intérieur d'un foyer de chaudière à lit fluidisé un ou plusieurs panneaux de tubes d'échange de chaleur parcourus par un fluide caloporteur comme de l'eau ou une émulsion d'eau et de vapeur - tel que decrit par exemple dans le document WO-A-98 25074 . Chaque panneau de tubes est disposé conventionnellement perpendiculairement aux parois latérales du foyer en y étant fixé ou non. Toutefois, pour le cas d'un foyer comprenant deux soles séparées par un entrejambe, une telle disposition a pour inconvénient de limiter le nombre de panneaux pouvant être installés sur les parois latérales du foyer sans entraver la circulation des particules vers les cyclones prévues sur ces parois latérales.A fireplace of the type indicated above for a circulating fluidized bed boiler is known in particular from the patent application. EP-A-0 477 849 . It is known to install inside a fluidized bed boiler furnace one or more panels of heat exchange tubes traversed by a heat transfer fluid such as water or an emulsion of water and steam - as described for example in the document WO-A-98,25074 . Each panel of tubes is arranged conventionally perpendicular to the side walls of the fireplace by being fixed or not. However, for the case of a hearth comprising two soles separated by a crotch, such an arrangement has the disadvantage of limiting the number of panels that can be installed on the side walls of the fireplace without hindering the flow of particles to the cyclones provided on these side walls.

L'objet de l'invention est de proposer une autre disposition des panneaux de tubes d'échange de chaleur qui tire profit de la structure d'un foyer ayant dans sa partie inférieure un entrejambe.The object of the invention is to propose another arrangement of heat exchange tube panels that takes advantage of the structure of a fireplace having in its lower part a crotch.

Le foyer pour chaudière à lit fluidisé selon l'invention est caractérisé en ce que le panneau de tubes d'échange de chaleur est disposé verticalement au-dessus dudit entrejambe et perpendiculairement à la direction longitudinale desdites soles. De cette façon, ça ne gène pas l'équilibre de la charge dans le foyer. Une pluralité de panneaux peuvent être disposés en une rangée sur le dessus de l'entrejambe en étant espacés régulièrement les uns des autres selon ladite direction longitudinale de manière à laisser des espaces de circulation suffisants pour les particules ne créant pas de déséquilibres de pression à l'intérieur du foyer.The furnace for a fluidized bed boiler according to the invention is characterized in that the panel of heat exchange tubes is disposed vertically above said crotch and perpendicular to the longitudinal direction of said soles. In this way, it does not interfere with the load balance in the home. A plurality of panels may be arranged in a row on the top of the crotch being spaced regularly from each other in said longitudinal direction so as to leave sufficient circulation space for the particles does not create pressure imbalances at the same time. inside the fireplace.

Dans un mode de réalisation particulier du foyer selon l'invention, les tubes formant un panneau sont le prolongement des tubes formant l'entrejambe ce qui évite la formation de traversées dans l'entrejambe. Un foyer selon l'invention peut également comprendre une alternance de panneaux dont les tubes sont le prolongement des tubes formant l'entrejambe et de panneaux dont les tubes sont raccordés à un collecteur disposé sous l'entrejambe. Il y aura donc des panneaux alimentés par le fluide circulant dans les parois du foyer et des panneaux alimentés soit par le même fluide soit par un autre fluide caloporteur.In a particular embodiment of the fireplace according to the invention, the tubes forming a panel are an extension of the tubes forming the crotch which prevents the formation of crossings in the crotch. A fireplace according to the invention may also comprise an alternation of panels whose tubes are an extension of the tubes forming the crotch and panels whose tubes are connected to a collector disposed under the crotch. So there will be panels powered by the fluid flowing in the walls of the fireplace and panels fed either by the same fluid or by another heat transfer fluid.

De préférence, chaque panneau de tubes est fixé au plafond du foyer de telle manière que le panneau de tubes puisse, si nécessaire, être mis en traction entre l'entrejambe et le plafond du foyer pour limiter les vibrations produites par la circulation du fluide des les tubes des panneaux.Preferably, each panel of tubes is fixed to the ceiling of the hearth so that the panel of tubes can, if necessary, be placed in tension between the crotch and the ceiling of the hearth to limit the vibrations produced by the circulation of the fluid. the tubes of the panels.

Il est décrit ci-après, à titre d'exemple et en référence aux figures schématiques du dessin annexé, un foyer pour chaudière à lit fluidisé selon l'invention.Hereinafter, by way of example and with reference to the schematic figures of the accompanying drawings, a furnace for a fluidized bed boiler according to the invention is described.

La figure 1 est une vue très schématique d'un foyer selon l'invention en coupe longitudinale montrant un panneau de tubes disposé sur l'entrejambe du foyer.The figure 1 is a very schematic view of a fireplace according to the invention in longitudinal section showing a panel of tubes disposed on the crotch of the hearth.

La figure 2 est une vue très schématique du dessus du foyer montrant la disposition de plusieurs panneaux de tubes sur l'entrejambe du foyer.The figure 2 is a very schematic view of the top of the fireplace showing the arrangement of several panels of tubes on the crotch of the hearth.

La figure 3 illustre de façon très schématique la formation d'un panneau de tubes avec les tubes formant l'entrejambe du foyer.The figure 3 illustrates very schematically the formation of a panel of tubes with the tubes forming the crotch of the hearth.

Le foyer illustré sur la figure 1 est un foyer pour chaudière à lit fluidisé circulant (LFC) dont la partie inférieure forme un entrejambe 1 séparant deux soles 2,3 du foyer. Les sorties du foyer vers des cyclones sont indiquées par les références 4,5. Les sorties vers les cyclones sont habituellement disposées sur les parois latérales du foyer et un foyer à entrejambe peut comporter quatre ou plus sorties vers les cyclones disposées de part et d'autre de l'entrejambe.The fireplace shown on the figure 1 is a furnace for circulating fluidized bed (CFL) boiler whose lower part forms a crotch 1 separating two soles 2.3 from the hearth. Outputs from the fireplace to cyclones are indicated by references 4,5. The exits to the cyclones are usually arranged on the side walls of the hearth and a crotch fire may have four or more outlets to the cyclones disposed on either side of the crotch.

Le foyer selon l'invention est équipé d'au moins un panneau 6 de tubes d'échange de chaleur qui est disposé verticalement sur le dessus de l'entrejambe 1 et perpendiculairement à la direction longitudinale A des soles 2 et 3 ce qui ne gêne pas la circulation des gaz et particules indiquée par les flèches GP et ne crée pas de déséquilibre de pression dans le foyer. Chaque panneau 6 de tubes d'échange de chaleur est fixé au plafond 7 du foyer et est mis en traction entre le plafond et l'entrejambe pour éviter les vibrations intempestives des tubes du panneau lors du fonctionnement du foyer.The fireplace according to the invention is equipped with at least one panel 6 of heat exchange tubes which is arranged vertically on the top of the crotch 1 and perpendicularly to the longitudinal direction A of the soles 2 and 3 which does not interfere not the flow of gases and particles indicated by the arrows GP and does not create pressure imbalance in the home. Each panel 6 of heat exchange tubes is fixed to the ceiling 7 of the fireplace and is placed in tension between the ceiling and the crotch to prevent the unwanted vibrations of the tubes of the panel during operation of the fireplace.

Sur la figure 1, on a représenté un collecteur d'entrée 8 placé sous l'entrejambe 6 et un collecteur de sortie 9 placé sur le dessus du plafond 7 du foyer auxquels sont raccordés les tubes du panneau 6.On the figure 1 , there is shown an inlet manifold 8 placed under the crotch 6 and an outlet manifold 9 placed on top of the ceiling 7 of the hearth to which the tubes of the panel 6 are connected.

Comme visible sur la figure 2, un grand nombre de panneaux 6 de tubes peuvent être disposés en rangée sur le dessus de l'entrejambe 1 en étant espacés régulièrement les uns des autres le long de l'entrejambe 1.As visible on the figure 2 , a large number of panels 6 of tubes can be arranged in a row on the top of the crotch 1 being regularly spaced from each other along the crotch 1.

Les tubes formant les panneaux 6 d'échange de chaleur peuvent être le prolongement des tubes formant l'entrejambe du foyer. Il est également possible d'avoir une alternance de panneaux 6 dont les tubes sont le prolongement des tubes formant l'entrejambe du foyer et de panneaux dont les tubes sont raccordés au collecteur d'entrée 8. La figure 3 illustre un panneau 6A (vu de dessus) dont les tubes 10 sont le prolongement des tubes 11 formant l'entrejambe 1 et un panneau 6B (vu de dessus) dont les tubes 12 sont raccordés au collecteur d'entrée 8 (non représenté). Bien entendu, la topologie des tubes formant l'entrejambe 1 montrée sur la figure 3 n'est qu'un exemple de l'invention. La disposition des panneaux 6 selon l'invention convient tant pour un entrejambe plan comme illustré sur la figure 1 qu'un entrejambe en forme de V inversé. Par ailleurs, dans l'exemple représenté, les sorties 4,5 vers les cyclones sont situées sur les faces latérales 13,14 ; elles pourraient être situées sur les faces latérales transversales 15 et 16The tubes forming the heat exchange panels 6 may be an extension of the tubes forming the crotch of the hearth. It is also possible to have an alternation of panels 6 whose tubes are an extension of the tubes forming the crotch of the fireplace and panels whose tubes are connected to the inlet manifold 8. The figure 3 illustrates a panel 6A (seen from above), the tubes 10 are an extension of the tubes 11 forming the crotch 1 and a panel 6B (seen from above), the tubes 12 are connected to the inlet manifold 8 (not shown). Of course, the topology of the tubes forming the crotch 1 shown on the figure 3 is only an example of the invention. The arrangement of the panels 6 according to the invention is suitable both for a crotch plane as illustrated on the figure 1 that an inverted V-shaped crotch. Furthermore, in the example shown, the outputs 4.5 to the cyclones are located on the side faces 13,14; they could be located on the transverse side faces 15 and 16

Claims (5)

  1. A fluidized bed boiler furnace comprising two hearths (2, 3) separated by a divider (1) in the lower part of the furnace, and at least one panel (6) of heat exchange tubes, characterized in that the panel of tubes is arranged vertically above said divider and perpendicularly to the longitudinal direction (A) of said hearths.
  2. The furnace according to claim 1, comprising a row of panels (6) of tubes spaced apart from one another at regular intervals in said longitudinal direction.
  3. The furnace according to one of claims 1 or 2, in which the tubes forming a panel (6A) are the continuation of the tubes forming the divider.
  4. The furnace according to claims 1 to 3, comprising an alternating arrangement of panels (6A), the tubes of which are the continuation of the tubes forming the divider, and of panels (6B), the tubes of which are connected to a manifold (8) arranged below the divider.
  5. The furnace according to one of claims 1 to 4, comprising a ceiling (7), to which each panel (6, 6A, 6B) of tubes is fixed in such a way that the panel of tubes can be put into traction between the divider and the ceiling of the furnace.
EP03727571A 2002-03-25 2003-03-06 Fluidized bed boiler furnace comprising two hearths separated by an inside leg area Expired - Lifetime EP1490629B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0203698 2002-03-25
FR0203698A FR2837561B1 (en) 2002-03-25 2002-03-25 FLUIDIZED BED BOILER FIREPLACE COMPRISING TWO FLOORS SEPARATED BY A CRACK
PCT/FR2003/000715 WO2003081128A1 (en) 2002-03-25 2003-03-06 Fluidized bed boiler furnace comprising two hearths separated by an inside leg area

Publications (2)

Publication Number Publication Date
EP1490629A1 EP1490629A1 (en) 2004-12-29
EP1490629B1 true EP1490629B1 (en) 2008-11-12

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Application Number Title Priority Date Filing Date
EP03727571A Expired - Lifetime EP1490629B1 (en) 2002-03-25 2003-03-06 Fluidized bed boiler furnace comprising two hearths separated by an inside leg area

Country Status (11)

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US (1) US7152537B2 (en)
EP (1) EP1490629B1 (en)
CN (1) CN1283950C (en)
AT (1) ATE414242T1 (en)
AU (1) AU2003233363A1 (en)
BR (1) BR0303655A (en)
CA (1) CA2480020A1 (en)
DE (1) DE60324667D1 (en)
ES (1) ES2316752T3 (en)
FR (1) FR2837561B1 (en)
WO (1) WO2003081128A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2884900B1 (en) * 2005-04-26 2007-11-30 Alstom Technology Ltd FLUIDIZED BED REACTOR WITH DOUBLE WALL EXTENSION
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
CN102226518B (en) * 2011-02-01 2013-03-06 中国科学院工程热物理研究所 Large-scale circulating fluidized bed boiler
EP2642199B1 (en) * 2012-03-20 2017-06-21 General Electric Technology GmbH Circulating fluidized bed boiler

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3387590A (en) * 1967-03-16 1968-06-11 Interior Usa System for regulating the total heat output in a burning fluidized bed heat exchanger or boiler
US3893426A (en) * 1974-03-25 1975-07-08 Foster Wheeler Corp Heat exchanger utilizing adjoining fluidized beds
US4184455A (en) * 1978-04-10 1980-01-22 Foster Wheeler Energy Corporation Fluidized bed heat exchanger utilizing angularly extending heat exchange tubes
US4314967A (en) * 1980-10-02 1982-02-09 Dorr-Oliver Incorporated Fluidized bed reactor with vertical cooling coils
FI97315C (en) * 1990-09-26 1996-11-25 Stein Industrie Fluidized bed boiler furnace wall cooling equipment
US5836257A (en) * 1996-12-03 1998-11-17 Mcdermott Technology, Inc. Circulating fluidized bed furnace/reactor with an integral secondary air plenum
US6532905B2 (en) * 2001-07-17 2003-03-18 The Babcock & Wilcox Company CFB with controllable in-bed heat exchanger

Also Published As

Publication number Publication date
US20050092219A1 (en) 2005-05-05
ES2316752T3 (en) 2009-04-16
ATE414242T1 (en) 2008-11-15
CA2480020A1 (en) 2003-10-02
WO2003081128A1 (en) 2003-10-02
EP1490629A1 (en) 2004-12-29
FR2837561A1 (en) 2003-09-26
CN1283950C (en) 2006-11-08
CN1643302A (en) 2005-07-20
DE60324667D1 (en) 2008-12-24
FR2837561B1 (en) 2004-05-21
AU2003233363A1 (en) 2003-10-08
BR0303655A (en) 2004-07-13
US7152537B2 (en) 2006-12-26

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