EP0898116A1 - Heat exchange device for a circulating fluidized bed boiler - Google Patents

Heat exchange device for a circulating fluidized bed boiler Download PDF

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Publication number
EP0898116A1
EP0898116A1 EP98402064A EP98402064A EP0898116A1 EP 0898116 A1 EP0898116 A1 EP 0898116A1 EP 98402064 A EP98402064 A EP 98402064A EP 98402064 A EP98402064 A EP 98402064A EP 0898116 A1 EP0898116 A1 EP 0898116A1
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EP
European Patent Office
Prior art keywords
exchanger
heat exchanger
beams
fluidized bed
particles
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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.)
Granted
Application number
EP98402064A
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German (de)
French (fr)
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EP0898116B1 (en
Inventor
Jean-Claude Semedard
Pierre Gauville
Christian Enault
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Alstom Power Boiler SA
Original Assignee
GEC Alsthom Stein Industrie
Alstom Energy Systems SA
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Publication of EP0898116A1 publication Critical patent/EP0898116A1/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
    • F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D13/00—Heat-exchange apparatus using a fluidised bed
    • 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
    • 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
    • F22B31/0069—Systems therefor
    • 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
    • F22B31/0084—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 with recirculation of separated solids or with cooling of the bed particles outside the combustion bed

Definitions

  • the present invention relates to an exchange device thermal for a circulating fluidized bed boiler.
  • This second exchanger generally consists of several bundles of tubes, each comprising several coils arranged in parallel planes generally vertical. In these beams the fluid circulates coolant, usually water vapor, the whole being integrated in a rectangular container.
  • these beams are arranged from the as follows: from a wall of the tank we meet a first beam separated or not from this wall by a space without coil, then a second beam separated or not from the first beam by a space without coil; space between the first and the second beams can include a physical separation such as a low wall or a partition; the any additional beams are arranged so analogous so that the last beam is separated or not by a space without a coil on the wall of the tank opposite to the one next to the first beam.
  • the particle supply duct of the fluidized bed dense ET2 is therefore connected to a wall of the tank or to the space free between the first beam and this wall, the return particles at focus C occurring through the opposite wall or by an output connected to the free space between the last beam and this opposite wall.
  • the intense mixing of particles tends to homogenize the temperature in the tank, however, as the particles come out of the tank colder than they entered, this temperature is not the same in all respects.
  • the tubes located near the particle inlet receive more heat than those who are close to the exit.
  • the temperature dispersion is directly related to the size of the rectangular tray. So the temperature of the vapor produced by the first beam disposed at the entrance of the particles is greater than that of the last beam placed at the exit, which is not desirable.
  • the present invention thus relates to a device heat exchange which allows to obtain at the output bundles of the second exchanger at a temperature substantially uniform.
  • the heat exchange device includes a first heat exchanger followed by a second heat exchanger arranged in a dense fluidized bed, this second exchanger consisting of a plurality of tubular bundles arranged along the path of particles suspended in the dense fluidized bed.
  • the second exchanger comprising at least two power supplies located on either side of its center, these power supplies each receive a separate mixture of inlet fluid and outlet fluid from the first exchanger, so the temperature of the fluid entering each beams is an increasing function of its distance to the entry of the particles into this dense fluidized bed.
  • Differences in particle temperature in the bed dense fluidized are therefore compensated by the deviations of temperature of the fluids which supply the different bundles.
  • An efficient thermal solution when the second exchanger has more than two bundles, consists of providing a clean diet for each of these beams.
  • the beams are formed by coils of tubes arranged in vertical and parallel planes.
  • the particle path is perpendicular to the plans in which the coils appear.
  • a preferred embodiment consists in adopting bundles which are all identical.
  • At least one of the mixtures of the inlet and outlet fluids of the first exchanger is produced by control valves connected to the inlet and at the outlet of this first exchanger.
  • At least one of the mixtures of the inlet and outlet fluids of the first exchanger is produced by a connected control valve either at the entrance or at the exit of this exchanger.
  • the ET2 dense fluidized bed here takes the form of a tank rectangular. By abuse of language the whole bin will be considered the second heat exchanger.
  • ET2 tank is connected to an inlet pipe for 2E particles on one of its walls parallel to the planes coils and a 2S particle outlet line on the opposite wall. In this configuration, the flow of particles is therefore on average perpendicular to the planes of streamers.
  • the first beam F1 is placed on the entry side particles 2E and the third beam F3 on the side of the 2S output.
  • Each beam F1, F2, F3 has its own supply A1, A2, A3 (one input collector) while that there is a single BS outlet collector for all the beams.
  • each beam has its own output collector.
  • the supply A1, A2, A3 of each of the beams is connected via two control valves to the inlet and outlet of the first heat exchanger ET1. These valves are therefore regulated so that the temperatures at the output of the beams F1, F2, F3 are substantially equal.
  • valves could be replaced by a simple diaphragm.
  • Another achievement would consist in replacing the two valves associated with a supply by a three-way valve.
  • This collector located at the level of the first beam is connected via two control valves at the inlet and outlet of the first heat exchanger ET1, while its end is shown at the third beam is connected directly to the output of this exchanger ET1.
  • the BE input collector supplies could be deported and not appear exactly in his ends: what matters is having two sufficiently distant power supplies that are positioned on either side of the center of this collector.
  • this BE input collector is provided with a power supply additional arranged substantially in the middle, this feed receiving a mixture of fluids from the input and output of the first heat exchanger ET1.
  • the invention allows by means of organs to static or regulated settings to obtain different vapor beams having approximately the same temperature.
  • the invention obviously applies if there are two bundles or if there are more than three.
  • the invention also applies if any element is inserted between the ET2 dense fluidized bed and the conduit particles S2 of the separating member S (or else between the ET2B dense fluidized bed and the hearth extraction duct C if this ET2B dense fluidized bed is supplied by particles collected in this focus).
  • the invention is therefore not limited to the modes of realization described and it can be implemented well ways, if only by replacing a means with a equivalent means.

Abstract

The heat exchanger system is used with a heater with a circulating fluidised bed. Fluid flows in through a first heat exchanger (ET1) which is followed by a second heat exchanger (ET2). The fluid approaching the first heat exchanger is split into four streams, one of which enters the heat exchanger and three of which bypass the first heat exchanger and go to the second heat exchanger. The output from the first heat exchanger is divided into three, with each branch joining one of the bypass branches. The three united flows go to separate headers (A1-3) for separate tube bundles (F1-3) inside the second heat exchanger. All the tube bundles discharge into a common header (BS) leading to a common outlet. The fluidised particulate material enters the heat-exchanger through a first conduit (2E), flows past the tube bundles and leaves via a second, diametrically-opposed conduit, (2S).

Description

La présente invention concerne un dispositif d'échange thermique pour une chaudière à lit fluidisé circulant.The present invention relates to an exchange device thermal for a circulating fluidized bed boiler.

Une telle chaudière comporte entre autres les éléments suivants symbolisés dans la figure 1 :

  • un foyer C assurant la combustion du combustible en un lit fluidisé circulant de particules, foyer dont les parois comprennent des tuyaux verticaux dans lesquels circule une émulsion (phase liquide et phase vapeur) d'eau produite par évaporation de l'eau qui est introduite à la base de ces tuyaux ;
  • un organe de séparation s, généralement un cyclone, qui récupère les gaz et les particules éjectées en haut du foyer pour les diriger dans deux conduits distincts ;
  • un premier échangeur thermique ET1, souvent raccordé au conduit gaz s1 de l'organe de séparation S, qui est par exemple un économiseur, un vaporisateur, un surchauffeur ou un resurchauffeur ;
  • un lit fluidisé dense ET2 alimenté en particules à partir de l'organe de séparation S, c'est à dire raccordé d'une part au conduit particules S2 de cet organe et d'autre part à la partie basse du foyer C (on peut également prévoir un lit fuidisé dense ET2B alimenté par des particules collectées dans le foyer C, c'est à dire raccordé d'une part au conduit d'extraction de ce foyer et d'autre part à sa partie basse), ce lit fluidisé dense comportant un deuxième échangeur thermique dont l'entrée est raccordée à la sortie du premier échangeur ET1.
Such a boiler includes among others the following elements symbolized in Figure 1:
  • a hearth C ensuring the combustion of the fuel in a fluidized bed circulating of particles, hearth whose walls include vertical pipes in which circulates an emulsion (liquid phase and vapor phase) of water produced by evaporation of the water which is introduced to the base of these pipes;
  • a separation member s, generally a cyclone, which collects the gases and particles ejected at the top of the hearth to direct them in two separate conduits;
  • a first heat exchanger ET1, often connected to the gas conduit s1 of the separation member S, which is for example an economizer, a vaporizer, a superheater or a superheater;
  • a dense fluidized bed ET2 supplied with particles from the separation member S, that is to say connected on the one hand to the particle conduit S2 of this member and on the other hand to the lower part of the hearth C (it is possible to also provide a dense fuidized bed ET2B supplied by particles collected in the hearth C, i.e. connected on the one hand to the extraction duct of this hearth and on the other hand to its lower part), this dense fluidized bed comprising a second heat exchanger, the inlet of which is connected to the outlet of the first exchanger ET1.

Ce deuxième échangeur est en général constitué de plusieurs faisceaux de tubes comportant chacun plusieurs serpentins arrangés dans des plans parallèles généralement verticaux. Dans ces faisceaux circule le fluide caloporteur, couramment de la vapeur d'eau, le tout étant intégré dans un bac rectangulaire. This second exchanger generally consists of several bundles of tubes, each comprising several coils arranged in parallel planes generally vertical. In these beams the fluid circulates coolant, usually water vapor, the whole being integrated in a rectangular container.

La plupart du temps, ces faisceaux sont agencés de la façon suivante : depuis une paroi du bac on rencontre un premier faisceau séparé ou non de cette paroi par un espace sans serpentin, puis un deuxième faisceau séparé ou non du premier faisceau par un espace sans serpentin ; l'espace entre le premier et le deuxième faisceaux peut comporter une séparation physique telle qu'un muret ou une cloison ; les éventuels faisceaux additionnels sont agencés de manière analogue de sorte que le dernier faisceau soit séparé ou non par un espace sans serpentin de la paroi du bac opposée à celle qui est en regard du premier faisceau.Most of the time, these beams are arranged from the as follows: from a wall of the tank we meet a first beam separated or not from this wall by a space without coil, then a second beam separated or not from the first beam by a space without coil; space between the first and the second beams can include a physical separation such as a low wall or a partition; the any additional beams are arranged so analogous so that the last beam is separated or not by a space without a coil on the wall of the tank opposite to the one next to the first beam.

Le conduit d'alimentation en particules du lit fuidisé dense ET2 est donc raccordé à une paroi du bac ou à l'espace libre entre le premier faisceau et cette paroi, le retour des particules au foyer C se faisant par la paroi opposée ou par une sortie connectée à l'espace libre entre le dernier faisceau et cette paroi opposée.The particle supply duct of the fluidized bed dense ET2 is therefore connected to a wall of the tank or to the space free between the first beam and this wall, the return particles at focus C occurring through the opposite wall or by an output connected to the free space between the last beam and this opposite wall.

Le brassage intense des particules tend à homogénéiser la température dans le bac, cependant, comme les particules ressortent du bac plus froides qu'elles n'y sont entrées, cette température n'est pas la même en tous points. Les tubes situés à proximité de l'entrée des particules reçoivent un apport de chaleur plus important que ceux qui sont proches de la sortie.The intense mixing of particles tends to homogenize the temperature in the tank, however, as the particles come out of the tank colder than they entered, this temperature is not the same in all respects. The tubes located near the particle inlet receive more heat than those who are close to the exit.

De plus, lorsque la puissance de la chaudière augmente, il en va de même pour la puissance et donc pour la taille des échangeurs. Or la dispersion de température est directement liée à la taille du bac rectangulaire. Ainsi, la température de la vapeur produite par le premier faisceau disposé à l'entrée des particules est supérieure à celle du dernier faisceau disposé à la sortie, ce qui n'est pas souhaitable.In addition, when the power of the boiler increases, the same goes for the power and therefore for the size of the exchangers. The temperature dispersion is directly related to the size of the rectangular tray. So the temperature of the vapor produced by the first beam disposed at the entrance of the particles is greater than that of the last beam placed at the exit, which is not desirable.

Par surcroít, on évite de réaliser des faisceaux qui supportent tous la température maximale du bac car il s'agit là d'une solution coûteuse. On prévoit donc autant de types de faisceaux qu'il y en a dans un échangeur, chaque type étant dimensionné pour une température de fonctionnement qui correspond à son emplacement dans le bac. En procédant de la sorte, on se prive des nombreux avantages qui découlent d'une ligne de fabrication unique.In addition, it avoids making beams which all support the maximum temperature of the tank because it is there an expensive solution. So there are as many types of bundles that there are in an exchanger, each type being sized for an operating temperature which corresponds to its location in the bin. By proceeding from the so, we deprive ourselves of the many advantages that flow of a unique manufacturing line.

La présente invention a ainsi pour objet un dispositif d'échange thermique qui permette d'obtenir en sortie des faisceaux du deuxième échangeur une température sensiblement uniforme.The present invention thus relates to a device heat exchange which allows to obtain at the output bundles of the second exchanger at a temperature substantially uniform.

Selon l'invention, le dispositif d'échange thermique comprend un premier échangeur thermique suivi d'un deuxième échangeur thermique disposé dans un lit fluidisé dense, ce deuxième échangeur étant constitué d'une pluralité de faisceaux tubulaires disposés le long du trajet des particules en suspension dans le lit fluidisé dense. De plus, le deuxième échangeur comportant au moins deux alimentations situées de part et d'autre de son centre, ces alimentations reçoivent chacune un mélange distinct du fluide d'entrée et du fluide de sortie du premier échangeur, de sorte que la température du fluide entrant dans chacun des faisceaux soit une fonction croissante de sa distance à l'entrée des particules dans ce lit fluidisé dense.According to the invention, the heat exchange device includes a first heat exchanger followed by a second heat exchanger arranged in a dense fluidized bed, this second exchanger consisting of a plurality of tubular bundles arranged along the path of particles suspended in the dense fluidized bed. Of plus, the second exchanger comprising at least two power supplies located on either side of its center, these power supplies each receive a separate mixture of inlet fluid and outlet fluid from the first exchanger, so the temperature of the fluid entering each beams is an increasing function of its distance to the entry of the particles into this dense fluidized bed.

Les écarts de température des particules dans le lit fluidisé dense sont donc compensés par les écarts de température des fluides qui alimentent les différents faisceaux.Differences in particle temperature in the bed dense fluidized are therefore compensated by the deviations of temperature of the fluids which supply the different bundles.

Une solution efficace quant au plan thermique, lorsque le deuxième échangeur comporte plus de deux faisceaux, consiste à prévoir une alimentation propre pour chacun de ces faisceaux.An efficient thermal solution, when the second exchanger has more than two bundles, consists of providing a clean diet for each of these beams.

Cependant, une solution économique consiste au contraire à prévoir que les alimentions des faisceaux soient raccordées à un collecteur unique.However, an economical solution is to contrary to expect that the beam supplies are connected to a single collector.

Selon une caractéristique avantageuse, les faisceaux sont constitués par des serpentins de tubes agencés dans des plans verticaux et parallèles. According to an advantageous characteristic, the beams are formed by coils of tubes arranged in vertical and parallel planes.

De plus, le trajet des particules est perpendiculaire aux plans dans lesquels figurent les serpentins.In addition, the particle path is perpendicular to the plans in which the coils appear.

Un mode de réalisation privilégié consiste à adopter des faisceaux qui sont tous identiques.A preferred embodiment consists in adopting bundles which are all identical.

Avantageusement, l'un au moins des mélanges des fluides d'entrée et de sortie du premier échangeur est réalisé par des vannes de régulation raccordées à l'entrée et à la sortie de ce premier échangeur.Advantageously, at least one of the mixtures of the inlet and outlet fluids of the first exchanger is produced by control valves connected to the inlet and at the outlet of this first exchanger.

Toutefois, on peut prévoir que l'un au moins des mélanges des fluides d'entrée et de sortie du premier échangeur soit réalisé par une vanne de régulation raccordée soit à l'entrée soit à la sortie de cet échangeur.However, it can be expected that at least one of the mixtures of the inlet and outlet fluids of the first exchanger is produced by a connected control valve either at the entrance or at the exit of this exchanger.

L'invention apparaítra maintenant avec plus de détails dans le cadre de la description qui suit d'exemples de réalisation donnés à titre illustratif en référence aux figures annexées qui représentent :

  • la figure 1, une représentation symbolique d'une chaudière à laquelle s'applique l'invention,
  • la figure 2, un premier mode de réalisation de l'invention, et
  • la figure 3, une variante de l'invention.
The invention will now appear in more detail in the context of the following description of exemplary embodiments given by way of illustration with reference to the appended figures which represent:
  • FIG. 1, a symbolic representation of a boiler to which the invention applies,
  • FIG. 2, a first embodiment of the invention, and
  • Figure 3, a variant of the invention.

Les éléments présents dans différentes figures sont affectés d'une seule référence.The elements present in different figures are assigned a single reference.

Par la suite, les seuls composants d'une chaudière nécessaire à la compréhension de l'invention seront mentionnés dans le texte et représentés dans les figures.Subsequently, the only components of a boiler necessary for understanding the invention will mentioned in the text and represented in the figures.

En référence à la figure 2, on distingue en premier lieu le premier échangeur thermique ET1 symbolisé par un serpentin dans une enceinte.Referring to Figure 2, we distinguish first place the first heat exchanger ET1 symbolized by a serpentine in an enclosure.

Le lit fluidisé dense ET2 prend ici la forme d'un bac rectangulaire. Par abus de langage le bac entier sera considéré comme le deuxième échangeur thermique.The ET2 dense fluidized bed here takes the form of a tank rectangular. By abuse of language the whole bin will be considered the second heat exchanger.

Dans ce bac, figurent trois faisceaux de tubes en serpentin F1, F2, F3, les serpentins au nombre de trois par faisceau, étant dans des plans verticaux qui sont perpendiculaires à celui de la figure. In this bin, there are three bundles of tubes in coil F1, F2, F3, three coils by beam, being in vertical planes which are perpendicular to that of the figure.

Le bac ET2 est raccordé à une conduite d'entrée des particules 2E sur l'une de ses parois parallèles aux plans des serpentins et à une conduite de sortie des particules 2S sur la paroi opposée. Dans cette configuration, le flux des particules est donc en moyenne perpendiculaire aux plans de serpentins.ET2 tank is connected to an inlet pipe for 2E particles on one of its walls parallel to the planes coils and a 2S particle outlet line on the opposite wall. In this configuration, the flow of particles is therefore on average perpendicular to the planes of streamers.

Le premier faisceau F1 est disposé du côté de l'entrée des particules 2E et le troisième faisceau F3 du côté de la sortie 2S.The first beam F1 is placed on the entry side particles 2E and the third beam F3 on the side of the 2S output.

Chaque faisceau F1, F2, F3 possède sa propre alimentation A1, A2, A3 (un collecteur d'entrée) tandis qu'il est prévu un collecteur de sortie unique BS pour tous les faisceaux.Each beam F1, F2, F3 has its own supply A1, A2, A3 (one input collector) while that there is a single BS outlet collector for all the beams.

On pourrait naturellement adopter une autre disposition des faisceaux, par exemple en agençant les plans de serpentins de sorte qu'ils soient parallèles aux flux de particules. On pourrait également prévoir que chaque faisceau ait son propre collecteur de sortie.We could naturally adopt another arrangement of the beams, for example by arranging the plans of coils so that they are parallel to the streams of particles. We could also foresee that each beam has its own output collector.

L'alimentation A1, A2, A3 de chacun des faisceaux est raccordée par l'intermédiaire de deux vannes de régulation à l'entrée et à la sortie du premier échangeur thermique ET1. Ces vannes sont donc régulées de sorte que les températures en sortie des faisceaux F1, F2, F3 soient sensiblement égales.The supply A1, A2, A3 of each of the beams is connected via two control valves to the inlet and outlet of the first heat exchanger ET1. These valves are therefore regulated so that the temperatures at the output of the beams F1, F2, F3 are substantially equal.

Il s'agit là de la solution la plus performante et l'on pourrait très bien envisager que l'alimentation A1 du premier faisceau soit raccordée uniquement à l'entrée du premier échangeur thermique ET1 et que l'alimentation A3 du troisième faisceau soit raccordée uniquement à la sortie de cet échangeur ET1.This is the most efficient solution and we could very well consider that the A1 supply of the first beam is connected only to the input of the first heat exchanger ET1 and that the supply A3 of the third harness is connected only to the output of this exchanger ET1.

De même, l'une ou l'autre des vannes pourraient être remplacée par un simple diaphragme. Une autre réalisation consisterait à remplacer les deux vannes associées à une alimentation par une vanne trois voies.Likewise, either of the valves could be replaced by a simple diaphragm. Another achievement would consist in replacing the two valves associated with a supply by a three-way valve.

En fait, l'homme du métier comprend bien qu'il y a de nombreuses solutions disponibles pour alimenter les faisceaux à des températures différentes, dès lors que l'on dispose d'un accès par faisceau.In fact, the skilled person understands that there are many solutions available to power beams at different temperatures, as soon as we has beam access.

Selon une variante de l'invention, représentée dans la figure 2 on prévoit maintenant un collecteur d'entrée unique BE pour les trois faisceaux.According to a variant of the invention, represented in the figure 2 we now provide a single input collector BE for the three beams.

L'extrémité de ce collecteur située au niveau du premier faisceau est raccordée par l'intermédiaire de deux vannes de régulation à l'entrée et à la sortie du premier échangeur thermique ET1, tandis que son extrémité figurant au niveau du troisième faisceau est raccordée directement à la sortie de cet échangeur ET1.The end of this collector located at the level of the first beam is connected via two control valves at the inlet and outlet of the first heat exchanger ET1, while its end is shown at the third beam is connected directly to the output of this exchanger ET1.

Les alimentations du collecteur d'entrée BE pourraient être déportées et ne pas figurer exactement à ses extrémités : ce qui importe c'est de disposer de deux alimentations suffisamment distantes qui soient positionnées de part et d'autre du centre de ce collecteur.The BE input collector supplies could be deported and not appear exactly in his ends: what matters is having two sufficiently distant power supplies that are positioned on either side of the center of this collector.

De plus, les remarques faites plus haut en rapport avec la diversité des solutions disponibles pour la mise en oeuvre de l'invention s'appliquent ici également.In addition, the remarks made above in relation with the diversity of solutions available for the implementation work of the invention also apply here.

Dans le même esprit, on pourrait également prévoir que ce collecteur d'entrée BE soit pourvu d'une alimentation additionnelle disposée sensiblement en son milieu, cette alimentation recevant un mélange des fluides provenant de l'entrée et de la sortie du premier échangeur thermique ET1.In the same spirit, one could also foresee that this BE input collector is provided with a power supply additional arranged substantially in the middle, this feed receiving a mixture of fluids from the input and output of the first heat exchanger ET1.

Ainsi, l'invention permet au moyen d'organes de réglages statiques ou régulés d'obtenir en sortie des différents faisceaux des vapeurs ayant approximativement la même température.Thus, the invention allows by means of organs to static or regulated settings to obtain different vapor beams having approximately the same temperature.

L'invention s'applique évidemment s'il y a deux faisceaux ou s'il y en a plus de trois.The invention obviously applies if there are two bundles or if there are more than three.

L'invention s'applique aussi si un élément quelconque est intercalé entre le lit fluidisé dense ET2 et le conduit particules S2 de l'organe de séparation S (ou bien entre le lit fluidisé dense ET2B et le conduit d'extraction du foyer C si ce lit fluidisé dense ET2B est alimenté par des particules collectées dans ce foyer). The invention also applies if any element is inserted between the ET2 dense fluidized bed and the conduit particles S2 of the separating member S (or else between the ET2B dense fluidized bed and the hearth extraction duct C if this ET2B dense fluidized bed is supplied by particles collected in this focus).

L'invention n'est donc pas limitée aux modes de réalisation décrits et l'on peut la mettre en oeuvre de bien des façons, ne serait ce qu'en remplaçant un moyen par un moyen équivalent.The invention is therefore not limited to the modes of realization described and it can be implemented well ways, if only by replacing a means with a equivalent means.

Claims (8)

Dispositif d'échange thermique comprenant un premier échangeur thermique (ET1) suivi d'un deuxième échangeur thermique (ET2) disposé dans un lit fluidisé dense, ce deuxième échangeur étant constitué d'une pluralité de faisceaux tubulaires(F1, F2, F3) disposés le long du trajet des particules en suspension dans le lit fluidisé dense, caractérisé en ce que, ledit deuxième échangeur (ET2) comportant au moins deux alimentations situées de part et d'autre de son centre, ces alimentations reçoivent chacune un mélange distinct du fluide d'entrée et du fluide sortie dudit premier échangeur (ET1), de sorte que la température du fluide entrant dans chacun desdits faisceaux (F1, F2, F3) soit une fonction croissante de sa distance à l'entrée des particules dans ce lit fluidisé dense.Heat exchange device comprising a first heat exchanger (ET1) followed by a second exchanger thermal (ET2) placed in a dense fluidized bed, this second exchanger consisting of a plurality of tubular bundles (F1, F2, F3) arranged along the path particles suspended in the dense fluidized bed, characterized in that, said second exchanger (ET2) comprising at least two power supplies located on either side other from its center, these power supplies each receive a separate mixture of the inlet fluid and the outlet fluid said first exchanger (ET1), so that the temperature fluid entering each of said bundles (F1, F2, F3) or an increasing function of its distance to the entry of particles in this dense fluidized bed. Dispositif selon la revendication 1 caractérisé en ce que, ledit deuxième échangeur (ET2) comportant plus de deux faisceaux, chacun de ces faisceaux (F1, F2, F3) est pourvu d'une alimentation propre (A1, A2, A3).Device according to claim 1 characterized in that that said second exchanger (ET2) comprising more than two beams, each of these beams (F1, F2, F3) is provided clean food (A1, A2, A3). Dispositif selon la revendication 1, caractérisé en ce que les alimentions desdits faisceaux sont raccordées à un collecteur unique (BE).Device according to claim 1, characterized in that that the supplies of said beams are connected to a single collector (BE). Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que lesdits faisceaux (F1, F2, F3) sont constitués par des serpentins de tubes agencés dans des plans verticaux et parallèles.Device according to any one of claims 1 to 3, characterized in that said beams (F1, F2, F3) are formed by coils of tubes arranged in vertical and parallel planes. Dispositif selon la revendication 4, caractérisé en ce que le trajet des particules est perpendiculaire aux plans dans lesquels figurent lesdits serpentins.Device according to claim 4, characterized in that that the path of the particles is perpendicular to the planes in which the said coils appear. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits faisceaux (F1, F2, F3) sont identiques.Device according to any one of the claims above, characterized in that said beams (F1, F2, F3) are identical. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'un au moins desdits mélanges des fluides d'entrée et de sortie du premier échangeur (ET1) est réalisé par des vannes de régulation raccordées à l'entrée et à la sortie de ce premier échangeur.Device according to any one of the claims previous, characterized in that at least one of said mixtures of the inlet and outlet fluids of the first exchanger (ET1) is produced by control valves connected to the input and output of this first exchanger. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'un au moins desdits mélanges des fluides d'entrée et de sortie du premier échangeur (ET1) est réalisé par une vanne de régulation raccordées soit à l'entrée soit à la sortie de cet échangeur.Device according to any one of claims 1 to 6, characterized in that at least one of said mixtures of inlet and outlet fluids of the first exchanger (ET1) is realized by a control valve connected either to the entry is at the exit of this exchanger.
EP98402064A 1997-08-18 1998-08-14 Heat exchange device for a circulating fluidized bed boiler Expired - Lifetime EP0898116B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9710426A FR2767380B1 (en) 1997-08-18 1997-08-18 HEAT EXCHANGE DEVICE FOR A FLUIDIZED BED CIRCULATING BOILER
FR9710426 1997-08-18

Publications (2)

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EP0898116A1 true EP0898116A1 (en) 1999-02-24
EP0898116B1 EP0898116B1 (en) 2002-11-06

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US (1) US6206088B1 (en)
EP (1) EP0898116B1 (en)
JP (1) JPH11182801A (en)
KR (1) KR19990023667A (en)
DE (1) DE69809156T2 (en)
DK (1) DK0898116T3 (en)
ES (1) ES2183302T3 (en)
FR (1) FR2767380B1 (en)
PL (1) PL328052A1 (en)
ZA (1) ZA987424B (en)

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WO2009076628A2 (en) * 2007-12-13 2009-06-18 Johnson Controls Technology Company Hvac&r system valving
US9567876B2 (en) * 2009-06-05 2017-02-14 Gas Technology Institute Reactor system and solid fuel composite therefor
US20110277473A1 (en) * 2010-05-14 2011-11-17 Geoffrey Courtright Thermal Energy Transfer System
RS54251B1 (en) * 2012-11-23 2016-02-29 Alstom Technology Ltd Boiler having a fluidized bed heat exchanger

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EP0787946A1 (en) * 1996-01-31 1997-08-06 GEC ALSTHOM Stein Industrie External fluidized bed for equipping a circulating fluidized bed furnace

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KR19990023667A (en) 1999-03-25
ZA987424B (en) 1999-02-22
FR2767380B1 (en) 1999-09-24
FR2767380A1 (en) 1999-02-19
DK0898116T3 (en) 2003-03-10
DE69809156D1 (en) 2002-12-12
US6206088B1 (en) 2001-03-27
JPH11182801A (en) 1999-07-06
DE69809156T2 (en) 2003-07-17
EP0898116B1 (en) 2002-11-06
PL328052A1 (en) 1999-03-01
ES2183302T3 (en) 2003-03-16

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