EP0147275A2 - Combustion furnace for a fluidised-bed boiler - Google Patents
Combustion furnace for a fluidised-bed boiler Download PDFInfo
- Publication number
- EP0147275A2 EP0147275A2 EP84402448A EP84402448A EP0147275A2 EP 0147275 A2 EP0147275 A2 EP 0147275A2 EP 84402448 A EP84402448 A EP 84402448A EP 84402448 A EP84402448 A EP 84402448A EP 0147275 A2 EP0147275 A2 EP 0147275A2
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- Prior art keywords
- hearth
- tubes
- heat exchanger
- level
- air
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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.)
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Classifications
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- 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
- F23C10/002—Fluidised bed combustion apparatus for pulverulent solid fuel
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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
- F22B31/0038—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 with tubes in the bed
Definitions
- Combustion furnace for fluidized bed boilers Combustion furnace for fluidized bed boilers.
- the subject of the invention is a combustion hearth for a boiler with a fluidized bed of solid fuel, which can be used industrially for all desired purposes: production of steam, hot water, hot gases, etc.
- French patent n ° 82 00815 describes a fluidized bed hearth in which a particular solution is used which makes it possible to adjust the quantity of burnt fuel in a ratio greater than 2.
- This solution consists in using a fluidization grid of special design in which there are two separate gas blowing circuits; one of these circuits, called the treatment gas circuit, has its outlet orifices which are situated at a level higher than that of the orifices of the fluidization gas circuit. The adjustment made possible using this solution is not perfect in all circumstances.
- the main object of the invention is to arrive at another solution allowing the adjustment in a high ratio of the power of a combustion furnace in a fluidized bed, while retaining satisfactory operating conditions, that is to say does not not allowing an excessive rise in the temperature of the fluidized bed nor a significant loss of unburned products at the high speeds of the combustion air.
- the invention provides for the use of a heat exchanger having at least one bundle of tubes, but, according to the invention , these tubes have a more or less inclined arrangement which can become substantially vertical to extend vertically at least between the lowest level and the highest level of the fluidized bed in operation - the extreme operating conditions; in addition, this or these bundles of tubes are combined with secondary air injectors opening at the upper part of the combustion chamber ie combustion and directed towards the central zone of the latter.
- the tubes or the bundles of tubes are distributed throughout the volume of the hearth, mainly when it is a large hearth.
- the tubes or the bundles of tubes are arranged on the side wall or in the vicinity of the side wall of the hearth, mainly when it is a relatively small hearth, such as that of small boilers or small or medium boilers for relatively ashy fuels.
- the secondary air injectors are placed at the periphery of the hearth, at a level higher than the highest level reached by the tube bundle (s).
- the secondary air jets are directed towards the central zone of the hearth at an angle between 15 ° and 75 ° relative to the vertical, the total flow of these jets being between 5% and 10% of the total flow of the air introduced into the fireplace.
- the invention can be used with a fluidization grid of any type, from the moment when the inclined or vertical tubes can be arranged there.
- the invention can be used with a fluidization grid of special design with two distinct circuits and with two staged levels of the blowing orifices as described in the aforementioned document No. 82 00815.
- the hearth shown has a side wall 1 surrounding a square fluidizing grid 2. This is of the type with two separate blowing circuits 3, 4, both supplied with air since it is only a solid fuel combustion hearth.
- the first circuit 3 ends with orifices 3A open upwards in the upper face of the fluidization grid 2; the second circuit 4 ends with orifices 4A open horizontally at the top of vertical tubes 4B which extend upwards from the upper face of the grid 2, between the orifices 3A of the first circuit 3.
- the side wall 1 limits, with the fluidization grid 2, a volume 5 having a central zone 6.
- tubes 7, 8 are arranged vertically in the volume 5. They could be distributed equally throughout the volume 5; in this example, they are located in two parallel rows and arranged in staggered rows close to the side wall 1, so that the central zone 6 remains clear.
- the tubes 7, 8 are shown which are close to the vertical section plane and those which are further away have been omitted, for the sake of clarity of the drawing.
- the tubes 7 constitute a first bundle and the tubes 8 constitute a second bundle of a heat exchanger. At their lower end, they are connected to a manifold 9 for the arrival of a heat transfer fluid and at their upper end they are connected to a manifold 10 for discharging this fluid.
- a ramp 11 placed in a horizontal plane, provided with injec air streamers 12.
- the latter are distributed equally along the ramp 11 and they are directed towards the central zone 6 of the hearth at an angle a with the vertical.
- the air injectors 12 could be individually mounted on the side wall 1 and be supplied individually with air; as a further variant, the ramp 11 could be placed outside the side wall and connected thereto to each injector 12. In any case, the injectors 12 are determined and distributed so as to direct towards the central zone of the hearth, in a balanced manner, a total secondary air flow of between 5% and 20% of the total air flow introduced into the fireplace.
- the angle ⁇ of inclination of the air injectors 12 does not have a precise critical value; it can be chosen between 15 ° and 75 ° relative to the vertical, a preferred value being approximately 60 °.
- the air injectors 12 are movable in direction, so that the angle of inclination a can be modified according to the load of the bed.
- an automatic adjustment of this angle is provided, its value increasing as the level of the fluidized bed rises.
- the fluidized bed has a lower level 13 drawn in solid lines, in correspondence with the lowest thermal power obtained from the hearth and an upper level 14 drawn in lines mixed, corresponding to the highest thermal power obtained from the hearth.
- the tubes 7, 8 of the heat exchanger extend in a vertical direction substantially from the fluidization grid 2 to above the upper level 14 of the fluidized bed. In this latter operating state, at the maximum power of the hearth, the tubes 7, 8 are completely immersed in the fluidized bed; then they have their full efficiency of subtracting calories.
- the tubes 7, 8 are strictly vertical for this result to be obtained; they can be tilted vertically; they may also have an appearance other than straight.
- the tubes 7, 8 extend continuously at least from the lower level 13 of the fluidized bed and preferably from the fluidization grid 2 to the upper level 14 of the fluidized bed.
- the manifold 10 can be omitted and the tubes 7, 8 can be directly connected to the cooling tubes 15 which line the wall of the radiation and convection chamber 16 placed above the fluidization chamber as is known.
- the example described here shows that the invention is compatible with the use, known per se, of a heat exchanger with horizontal tubes 17 which are arranged in the vicinity of the lower level 13 of the fluidized bed.
- a circuit 18 for recycling inert materials for example ash.
- the level of the fluidized bed 2 rises at the same time as a turbulent zone develops. dense so that the tubes 7, 8 have, simultaneously, an increasing efficiency.
- the air jets exiting through the air injectors 12 improve the combustion in the part of the fluidized bed located below the ramp and modify the circulation currents inside the latter.
- the air jets emitted by the air injectors 12 keep the parts longer solid particles inside the hearth and reduce the size of the fraction of incompletely burned solid particles which escape prematurely.
- the combined means provided by the invention make it possible to maintain in the hearth a temperature of between 850 and 950 ° C. when the power is modified in the ratio from 1 to 4, for example by a variation of 1 m / s to 4 m / s of the speed of the gases passing through the fluidized bed.
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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)
- Treating Waste Gases (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
Description
Foyer de combustion pour chaudière à lit fluidisé.Combustion furnace for fluidized bed boilers.
L'invention a pour objet un foyer de combustion pour chaudière à lit fluidisé de combustible solide, utilisable industriellement à toutes fins souhaitées : production de vapeur, d'eau chaude, de gaz chauds, etc...The subject of the invention is a combustion hearth for a boiler with a fluidized bed of solid fuel, which can be used industrially for all desired purposes: production of steam, hot water, hot gases, etc.
Avec les chaudières connues à lit fluidisé, on rencontre des difficultés à en faire varier la puissance thermique en conservant des conditions optimales de fonctionnement. En agissant sur le débit du combustible fourni au foyer et sur le débit de l'air comburant, on n'obtient une variation que dans le rapport de 1 à 2 environ. Au-delà de ce rapport, les conditions de fonctionnement ne sont plus satisfaisantes. Avec des débits d'air élevés la perte de charge à travers la grille devient prohibitive ; avec des débits d'air faibles, on constate une mauvaise répartition de l'air de fluidisation et, par conséquent, une fluidisation de mauvaise qualité.With known fluidized bed boilers, it is difficult to vary the thermal power while maintaining optimal operating conditions. By acting on the flow rate of the fuel supplied to the fireplace and on the flow rate of the combustion air, a variation is only obtained in the ratio of approximately 1 to 2. Beyond this ratio, the operating conditions are no longer satisfactory. With high air flow rates, the pressure drop across the grid becomes prohibitive; with low air flow rates, there is a poor distribution of the fluidizing air and, consequently, poor quality fluidization.
Le brevet français n° 82 00815 décrit un foyer à lit fluidisé dans lequel on utilise une solution particulière qui rend possible le réglage dans un rapport supérieur à 2 de la quantité de combustible brùlé. Cette solution consiste à se servir d'une grille de fluidisation de conception spéciale dans laquelle il existe deux circuits distincts de soufflage de gaz ; l'un de ces circuits appelé circuit de gaz de traitement a ses orifices de sortie qui sont situés à un niveau supérieur à celui des orifices du circuit du gaz de fluidisation. Le réglage rendu possible à l'aide de cette solution n'est pas parfait en toutes circonstances. Aux grandes vitesses de l'air qui sont associées à un fort débit de combustible prûlé, la température s'élève trop à l'intérieur du lit en raison d'une évacuation insuffisante des calories produites; en outre, une partie non négligeable du combustible est entraînée hors du lit, sans être brûlée.French patent n ° 82 00815 describes a fluidized bed hearth in which a particular solution is used which makes it possible to adjust the quantity of burnt fuel in a ratio greater than 2. This solution consists in using a fluidization grid of special design in which there are two separate gas blowing circuits; one of these circuits, called the treatment gas circuit, has its outlet orifices which are situated at a level higher than that of the orifices of the fluidization gas circuit. The adjustment made possible using this solution is not perfect in all circumstances. At the high air speeds which are associated with a high flow of pre-burned fuel, the temperature rises too much inside the bed due to an insufficient evacuation of the calories produced; in addition, a non-negligible part of the fuel is drawn out of the bed, without being burnt.
Il est connu, par ailleurs, de placer dans un lit fluidisé des tubes d'un échangeur de chaleur, mais ces tubes sont le plus souvent disposés horizontalement, sensiblement dans une zone située au voisinage de la partie supérieure du lit. On fait fluctuer cette zone en agissant sur la vitesse du gaz de fluidisation, afin que les tubes de l'échangeur de chaleur se trouvent plongés dans le lit de manière plus ou moins complète, le coefficient d'échange de chaleur étant beaucoup plus élevé à l'intérieur du lit qu'en dehors du lit.It is also known to place in a fluidized bed of the tubes of a heat exchanger, but these tubes are most often arranged horizontally, substantially in an area located near the upper part of the bed. This zone is made to fluctuate by acting on the speed of the fluidizing gas, so that the tubes of the heat exchanger are more or less completely immersed in the bed, the heat exchange coefficient being much higher at inside the bed than outside the bed.
L'invention a pour but principal de parvenir à une autre solution permettant le réglage dans un rapport élevé de la puissance d'un foyer de combustion en lit fluidisé, tout en conservant des conditions satisfaisantes de fonctionnement, c'est-à-dire ne permettant pas une élévation excessive de la température du lit fluidisé ni une perte importante de produits non brQlés aux vitesses élevées de l'air comburant.The main object of the invention is to arrive at another solution allowing the adjustment in a high ratio of the power of a combustion furnace in a fluidized bed, while retaining satisfactory operating conditions, that is to say does not not allowing an excessive rise in the temperature of the fluidized bed nor a significant loss of unburned products at the high speeds of the combustion air.
A partir d'un foyer de combustion en lit fluidisé limité par une paroi latérale et par une grille de fluidisation, l'invention prévoit l'emploi d'un échangeur de chaleur ayant au moins un faisceau de tubes, mais, selon l'invention, ces tubes ont une disposition plus ou moins inclinée pouvant devenir substantiellement verticale pour s'étendre en sens vertical au moins entre le niveau le plus bas et le niveau le plus haut du lit fluidisé en fonction - les conditions extrêmes de fonctionnement ; en outre, ce ou ces faisceaux de tubes sont combinés à des injecteurs d'air secondaire s'ouvrant à la partie supérieure du foyer ie combustion et dirigés vers la zone centrale de ce dernier.From a combustion furnace in a fluidized bed limited by a side wall and by a fluidization grid, the invention provides for the use of a heat exchanger having at least one bundle of tubes, but, according to the invention , these tubes have a more or less inclined arrangement which can become substantially vertical to extend vertically at least between the lowest level and the highest level of the fluidized bed in operation - the extreme operating conditions; in addition, this or these bundles of tubes are combined with secondary air injectors opening at the upper part of the combustion chamber ie combustion and directed towards the central zone of the latter.
Selon une première variante de réalisation le l'invention, les tubes ou les faisceaux de tubes sont répartis dans l'ensemble du volume du foyer, principalement quand il s'agit de foyers importants.According to a first alternative embodiment of the invention, the tubes or the bundles of tubes are distributed throughout the volume of the hearth, mainly when it is a large hearth.
Selon une seconde variante de réalisation le l'invention, les tubes ou les faisceaux de tubes sont disposés sur la paroi latérale ou au voisinage de la paroi latérale du foyer, principalement quand il s'agit de foyers relativement peu importants, comme celui de petites chaudières ou de chaudières petites ou moyennes pour combustibles relativement cendreux.According to a second alternative embodiment of the invention, the tubes or the bundles of tubes are arranged on the side wall or in the vicinity of the side wall of the hearth, mainly when it is a relatively small hearth, such as that of small boilers or small or medium boilers for relatively ashy fuels.
De préférence, les injecteurs d'air secondaire sont placés à la périphérie du foyer, à un niveau supérieur au niveau le plus élevé atteint par le ou les faisceaux de tubes. Les jets d'air secondaire sont dirigés vers la zone centrale du foyer dans un angle compris entre 15° et 75° par rapport à la verticale, le débit total de ces jets étant compris entre 5 % et 10 % du débit total de l'air introduit dans le foyer.Preferably, the secondary air injectors are placed at the periphery of the hearth, at a level higher than the highest level reached by the tube bundle (s). The secondary air jets are directed towards the central zone of the hearth at an angle between 15 ° and 75 ° relative to the vertical, the total flow of these jets being between 5% and 10% of the total flow of the air introduced into the fireplace.
L'invention est utilisable avec une grille de fluidisation d'un type quelconque, à partir du moment où les tubes inclinés ou verticaux peuvent y être disposés. En particulier, l'invention est utilisable avec une grille de fluidisation de conception spéciale à deux circuits distincts et à deux niveaux étagés des orifices de soufflage comme décrit dans le document n° 82 00815 précité.The invention can be used with a fluidization grid of any type, from the moment when the inclined or vertical tubes can be arranged there. In particular, the invention can be used with a fluidization grid of special design with two distinct circuits and with two staged levels of the blowing orifices as described in the aforementioned document No. 82 00815.
On donnera maintenant, sans intention limitative et sans exclure aucune variante équivalente, une description d'un exemple de réalisation d'un foyer de combustion . On se reportera à la figure unique annexée qui est une vue en coupe par un plan vertical du foyer, conforme à l'invention, d'une chaudière à vapeur dont les.autres parties, non concernées par l'invention, ne sont pas représentées.We will now give, without limiting intention and without excluding any equivalent variant, a description of an exemplary embodiment of a combustion hearth. Reference will be made to the attached single figure which is a sectional view through a vertical plane of the hearth, according to the invention, of a steam boiler, the parts of which, not concerned by the invention, are not shown. .
L'exemple décrit ici est celui d'une réalisation relativement complexe, choisie volontairement pour montrer que l'invention est compatible avec divers moyens connus de perfectionnement d'un foyer.The example described here is that of a relatively complex embodiment, chosen voluntarily to show that the invention is compatible with various known means for improving a home.
Le foyer représenté a une paroi latérale 1 entourant une grille de fluidisation carrée 2. Celle-ci est du type à deux circuits distincts 3, 4 de soufflage, alimentés tous deux en air puisqu'il s'agit uniquement d'un foyer de combustion d'un combustible solide.The hearth shown has a side wall 1 surrounding a square fluidizing
Le premier circuit 3 se termine par des orifices 3A ouverts vers le haut dans la face supérieure de la grille de fluidisation 2 ; le second circuit 4 se termine par des orifices 4A ouverts horizontalement au sommet de tubulures verticales 4B qui s'étendent vers le haut à partir de la face supérieure de la grille 2, entre les orifices 3A du premier circuit 3. On trouvera une description détaillée de cette grille de fluidisation dans le documént n° 82 00815 déjà cité, qui est à considérer comme incorporé à la présente description par référence.The first circuit 3 ends with
Il est entendu cependant que l'emploi d'une grille de fluidisation d'un autre type, c'est-à-dire ayant, par exemple, un seul circuit de soufflage d'air alimentant les orifices 3A, est possible dans le cadre de l'invention.It is understood, however, that the use of a fluidization grid of another type, that is to say having, for example, a single air blowing circuit supplying the
La paroi latérale 1 limite avec la grille de fluidisation 2 un volume 5 ayant une zone centrale 6. Selon l'invention des tubes 7, 8 sont disposés verticalement dans le volume 5. Ils pourraient être répartis également dans l'ensemble du volume 5 ; dans cet exemple, ils sont situés sur deux rangs parallèles et disposés en quinconce proches de la paroi latérale 1, de sorte que la zone centrale 6 reste dégagée. Sur la figure, on a représenté seulement les tubes 7, 8 qui sont proches du plan de coupe vertical et on a omis ceux qui en sont plus éloignés, pour la clarté du dessin. Les tubes 7 constituent un premier faisceau et les tubes 8 constituent un second faisceau d'un échangeur de chaleur. A leur extrémité inférieure, ils sont raccordés à un collecteur 9 d'arrivée d'un fluide de transfert de calories et à leur extrémité supérieure ils sont raccordés à un collecteur 10 d'évacuation de ce fluide.The side wall 1 limits, with the
Au-dessus du niveau atteint par les tubes 7, 8 et le collecteur d'évacuation 10, est disposée, à proximité de la paroi latérale 1, sur la périphérie du foyer, une rampe 11, mise dans un plan horizontal, pourvue d'injecteurs d'air 12. Ces derniers sont répartis également le long de la rampe 11 et ils sont dirigés vers la zone centrale 6 du foyer en faisant un angle a avec la verticale. Les injecteurs d'air 12 pourraient être montés individuellement sur la paroi latérale 1 et être alimentés individuellement en air ; en variante encore la rampe 11 pourrait être placée à l'extérieur de la paroi latérale et raccordée à travers celle-ci à chaque injecteur 12. De toute façon, les injecteurs 12 sont déterminés et répartis pour diriger vers la zone centrale du foyer, de manière équilibrée, un débit total d'air secondaire compris entre 5 % et 20 % du débit d'air total introduit dans le foyer.Above the level reached by the
L'angle a d'inclinaison des injecteurs d'air 12 n'a pas une valeur précise critique ; il peut être choisi entre 15° et 75° par rapport à la verticale, une valeur préférée étant de 60° environ.The angle α of inclination of the
Selon un mode de réalisation de l'invention, les injecteurs d'air 12 sont mobiles en direction, de manière que l'angle d'inclinaison a puisse être modifié en fonction de la charge du lit. Selon une variante, on prévoit un réglage automatique de cet angle, sa valeur augmentant à mesure que le niveau du lit fluidisé s'élève.According to one embodiment of the invention, the
En fonction du débit d'air total soufflé à travers la grille de fluidisation 2, le lit fluidisé a un niveau inférieur 13 dessiné en trait plein, en correspondance avec la puissance thermique la plus faible obtenue du foyer et un niveau supérieur 14 dessiné en trait mixte, en correspondance avec la puissance thermique la plus élevée obtenue du foyer.Depending on the total air flow blown through the
Les tubes 7,8 de l'échangeur de chaleur s'étendent en sens vertical sensiblement à partir de la grille de fluidisation 2 jusqu'au dessus du niveau supérieur 14 du lit fluidisé. Dans ce dernier état de fonctionnement, à la puissance maximum du foyer, les tubes 7, 8 sont immergés complètement dans le lit fluidisé ; ils ont alors leur pleine efficacité de soustraction de calories.The
On notera qu'il n'est pas nécessaire que les tubes 7, 8 soient strictement verticaux pour que ce résultat soit obtenu ; ils peuvent être inclinés sur la verticale ; ils peuvent aussi avoir une apparence autre que rectiligne. L'important est que, dans la direction verticale, les tubes 7, 8 s'étendent de façon continue au moins à partir du niveau inférieur 13 du lit fluidisé et de préférence à partir de la grille de fluidisation 2 jusqu'au niveau supérieur 14 du lit fluidisé.Note that it is not necessary that the
Selon une variante de réalisation de l'invention, le collecteur 10 peut être supprimé et les tubes 7, 8 peuvent être directement reliés aux tubes de refroidissement 15 qui garnissent la paroi de la chambre de rayonnement et de convection 16 placée au-dessus de la chambre de fluidisation ainsi qu'il est connu.According to an alternative embodiment of the invention, the
L'exemple décrit ici montre que l'invention est compatible avec l'utilisation, connue en soi, d'un échangeur de chaleur à tubes horizontaux 17 qui sont disposés au voisinage du niveau inférieur 13 du lit fluidisé. Comme il est connu en soi, il est possible de prévoir, en plus du dispositif d'alimentation en combustible solide (non représenté), un circuit 18 de recyclage de matières inertes, par exemple de cendres.The example described here shows that the invention is compatible with the use, known per se, of a heat exchanger with horizontal tubes 17 which are arranged in the vicinity of the
Pendant le fonctionnement, à mesure que la puissance, c'est-à-dire le débit de combustible brûlé et le débit d'air comburant, augmente, le niveau du lit fluidisé 2 s'élève en même temps que se développe une zone turbulente dense de sorte que les tubes 7, 8 ont, simultanément, une efficacité croissante. En même temps, les jets d'air sortant par les injecteurs d'air 12 améliorent la combustion dans la partie du lit fluidisé située au-dessous de la rampe et modifient les courants de circulation à l'intérieur de celle-ci. En particulier, les jets d'air émis par les injecteurs d'air 12 maintiennent plus longtemps les particules solides à l'intérieur du foyer et diminuent l'importance de la fraction des particules solides incomplètement brûlées qui s'échappent prématurément du foyer.During operation, as the power, i.e. the flow rate of burned fuel and the flow rate of combustion air, increases, the level of the fluidized
Il se produit ainsi simultanément un confinement de la zone de combustion et une augmentation de la zone du foyer dans laquelle la combustion en particules est suffisante pour permettre un échange thermique avec des coefficients de transfert voisin de ceux qu'on observe en lit fluidisé dense.There thus occurs simultaneously a confinement of the combustion zone and an increase in the zone of the hearth in which the combustion in particles is sufficient to allow a heat exchange with transfer coefficients close to those observed in a dense fluidized bed.
On a constaté, en pratique, que les moyens combinés apportés par l'invention permettent de maintenir dans le foyer une température comprise entre 850 et 950°C quand la puissance est modifiée dans le rapport de 1 à 4, par exemple par une variation de 1 m/s à 4 m/s de la vitesse des gaz qui traversent le lit fluidisé.It has been found, in practice, that the combined means provided by the invention make it possible to maintain in the hearth a temperature of between 850 and 950 ° C. when the power is modified in the ratio from 1 to 4, for example by a variation of 1 m / s to 4 m / s of the speed of the gases passing through the fluidized bed.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84402448T ATE42390T1 (en) | 1983-12-02 | 1984-11-29 | COMBUSTION FURNACE FOR FLUID BED BOILER. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8319321 | 1983-12-02 | ||
FR8319321A FR2556075B1 (en) | 1983-12-02 | 1983-12-02 | COMBUSTION FIREPLACE FOR A FLUIDIZED BED BOILER |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0147275A2 true EP0147275A2 (en) | 1985-07-03 |
EP0147275A3 EP0147275A3 (en) | 1985-08-14 |
EP0147275B1 EP0147275B1 (en) | 1989-04-19 |
Family
ID=9294811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84402448A Expired EP0147275B1 (en) | 1983-12-02 | 1984-11-29 | Combustion furnace for a fluidised-bed boiler |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0147275B1 (en) |
JP (1) | JPS60248907A (en) |
AT (1) | ATE42390T1 (en) |
AU (1) | AU577073B2 (en) |
BR (1) | BR8406082A (en) |
CA (1) | CA1270706A (en) |
DE (1) | DE3477833D1 (en) |
ES (1) | ES538183A0 (en) |
FR (1) | FR2556075B1 (en) |
IN (1) | IN162288B (en) |
ZA (1) | ZA849114B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2581161A1 (en) * | 1985-04-29 | 1986-10-31 | Omnium Traitement Valorisa | Fluidised-bed boiler |
EP0319722A1 (en) * | 1987-12-09 | 1989-06-14 | Deutsche Kohle Marketing GmbH Steinkohlevertrieb-Wärmeversorgung | Combustion chamber for an atmospheric stationary fluidized-bed furnace |
EP0566099A2 (en) * | 1992-04-17 | 1993-10-20 | Ebara Corporation | Fluidized bed water tube boiler |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2591722B1 (en) * | 1985-12-18 | 1988-02-19 | Charbonnages De France | FLUIDIZED BED THERMAL GENERATOR WITH IMPROVED ASH DISCHARGE AND HEAT RECOVERY MEANS |
Citations (8)
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---|---|---|---|---|
GB858813A (en) * | 1957-06-11 | 1961-01-18 | Dingler Werke Ag | An improved furnace for fluidised bed combustion of solid fuels |
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 |
DE1401882A1 (en) * | 1962-12-20 | 1969-06-26 | Haniel & Lueg Gmbh | Process for the incineration of sewage sludge and fluidized bed furnace for the same implementation |
DE1923725A1 (en) * | 1968-05-10 | 1969-12-04 | Rose Downs & Thompson Ltd | Waste incineration process and device for its execution |
FR2268758A1 (en) * | 1974-04-24 | 1975-11-21 | Dorr Oliver Inc | |
FR2466706A1 (en) * | 1979-09-27 | 1981-04-10 | Dorr Oliver Inc | HEATER OR STEAM GENERATOR WITH FLUIDIZED BED AND LOW SIZE |
EP0032798A2 (en) * | 1980-01-16 | 1981-07-29 | Devanney, John W. III | Fluid bed combustor and process of producing a non-agglomerating vanadium coated particle |
US4314967A (en) * | 1980-10-02 | 1982-02-09 | Dorr-Oliver Incorporated | Fluidized bed reactor with vertical cooling coils |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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GB1311869A (en) * | 1969-12-12 | 1973-03-28 | Foster Wheeler Brown Boilers | Steam boilers |
JPS57122203A (en) * | 1981-01-23 | 1982-07-30 | Babcock Hitachi Kk | Load control operation of fluidized bed boiler |
FR2519877B1 (en) * | 1982-01-20 | 1986-10-31 | Charbonnages De France | FLUIDIZING GRID AND COMBUSTION FIRE WITH LOWER AIR BLOW GRID AND METHOD FOR TREATING PARTICULATE MATERIAL IN A FLUIDIZING AND / OR DRIVING CHAMBER |
US4449482A (en) * | 1982-04-28 | 1984-05-22 | Dorr-Oliver Incorporated | Fluidized bed boilers |
-
1983
- 1983-12-02 FR FR8319321A patent/FR2556075B1/en not_active Expired
-
1984
- 1984-11-22 ZA ZA849114A patent/ZA849114B/en unknown
- 1984-11-28 IN IN928/MAS/84A patent/IN162288B/en unknown
- 1984-11-29 EP EP84402448A patent/EP0147275B1/en not_active Expired
- 1984-11-29 DE DE8484402448T patent/DE3477833D1/en not_active Expired
- 1984-11-29 AT AT84402448T patent/ATE42390T1/en not_active IP Right Cessation
- 1984-11-29 BR BR8406082A patent/BR8406082A/en not_active IP Right Cessation
- 1984-11-30 CA CA000469040A patent/CA1270706A/en not_active Expired - Fee Related
- 1984-11-30 AU AU36091/84A patent/AU577073B2/en not_active Ceased
- 1984-11-30 JP JP59252064A patent/JPS60248907A/en active Granted
- 1984-11-30 ES ES538183A patent/ES538183A0/en active Granted
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB858813A (en) * | 1957-06-11 | 1961-01-18 | Dingler Werke Ag | An improved furnace for fluidised bed combustion of solid fuels |
DE1401882A1 (en) * | 1962-12-20 | 1969-06-26 | Haniel & Lueg Gmbh | Process for the incineration of sewage sludge and fluidized bed furnace for the same implementation |
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 |
DE1923725A1 (en) * | 1968-05-10 | 1969-12-04 | Rose Downs & Thompson Ltd | Waste incineration process and device for its execution |
FR2268758A1 (en) * | 1974-04-24 | 1975-11-21 | Dorr Oliver Inc | |
FR2466706A1 (en) * | 1979-09-27 | 1981-04-10 | Dorr Oliver Inc | HEATER OR STEAM GENERATOR WITH FLUIDIZED BED AND LOW SIZE |
EP0032798A2 (en) * | 1980-01-16 | 1981-07-29 | Devanney, John W. III | Fluid bed combustor and process of producing a non-agglomerating vanadium coated particle |
US4314967A (en) * | 1980-10-02 | 1982-02-09 | Dorr-Oliver Incorporated | Fluidized bed reactor with vertical cooling coils |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2581161A1 (en) * | 1985-04-29 | 1986-10-31 | Omnium Traitement Valorisa | Fluidised-bed boiler |
EP0319722A1 (en) * | 1987-12-09 | 1989-06-14 | Deutsche Kohle Marketing GmbH Steinkohlevertrieb-Wärmeversorgung | Combustion chamber for an atmospheric stationary fluidized-bed furnace |
EP0566099A2 (en) * | 1992-04-17 | 1993-10-20 | Ebara Corporation | Fluidized bed water tube boiler |
EP0566099A3 (en) * | 1992-04-17 | 1994-04-20 | Ebara Corp | |
US5311842A (en) * | 1992-04-17 | 1994-05-17 | Ebara Corporation | Fluidized bed water pipe boiler divided type |
Also Published As
Publication number | Publication date |
---|---|
ES8603988A1 (en) | 1986-01-01 |
JPH0235889B2 (en) | 1990-08-14 |
JPS60248907A (en) | 1985-12-09 |
CA1270706A (en) | 1990-06-26 |
EP0147275B1 (en) | 1989-04-19 |
ZA849114B (en) | 1985-07-31 |
FR2556075A1 (en) | 1985-06-07 |
FR2556075B1 (en) | 1988-08-19 |
ES538183A0 (en) | 1986-01-01 |
IN162288B (en) | 1988-04-23 |
BR8406082A (en) | 1985-09-24 |
ATE42390T1 (en) | 1989-05-15 |
AU577073B2 (en) | 1988-09-15 |
DE3477833D1 (en) | 1989-05-24 |
EP0147275A3 (en) | 1985-08-14 |
AU3609184A (en) | 1985-06-06 |
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