EP0950856A1 - Separator for combustible particles above a boiler with valve - Google Patents

Separator for combustible particles above a boiler with valve Download PDF

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Publication number
EP0950856A1
EP0950856A1 EP99400925A EP99400925A EP0950856A1 EP 0950856 A1 EP0950856 A1 EP 0950856A1 EP 99400925 A EP99400925 A EP 99400925A EP 99400925 A EP99400925 A EP 99400925A EP 0950856 A1 EP0950856 A1 EP 0950856A1
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EP
European Patent Office
Prior art keywords
separator
valve
tube
boiler
isolation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99400925A
Other languages
German (de)
French (fr)
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EP0950856B1 (en
Inventor
Claude Amieux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom Holdings SA
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Alstom France SA
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Publication date
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Publication of EP0950856A1 publication Critical patent/EP0950856A1/en
Application granted granted Critical
Publication of EP0950856B1 publication Critical patent/EP0950856B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/01—Selective separation of solid materials carried by, or dispersed in, gas currents using gravity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/30—Separating

Definitions

  • the invention relates to a separator arranged between a grinder and a boiler to select the size of the particles produced by grinding a fuel in the crusher and transported by flow of air from the grinder to the separator then to the boiler, which extends in an axial direction and which comprises compartments of outlet each surmounted by a transport pipe connecting the separator at the boiler.
  • Such a separator is used in particular for separating particles of coal and allow the boiler to be supplied with particles smaller than a reference size.
  • the particles larger than the reference size are recycled to the crusher to be ground again with charcoal departure.
  • Transport of particles from the crusher to the separator then towards the boiler is carried out by air flow channeled by transport lines. It is known to feed the home of the boiler through several pipes. For this reason, the separator usually has compartments of outlet which are each surmounted by a transport pipe connecting the separator at the boiler.
  • each hatch operates in barrier air overpressure by relative to the upstream and downstream pressure of the pipe on which it is mounted to close it with a perfect seal.
  • Transport lines connecting the separator to the boiler are closed during certain operating operations.
  • the object of the invention is to reduce the cost of isolating the transport lines which connect a particle separator fuel to a boiler in a grinding plant.
  • the idea behind the invention is to reduce the number of hatches.
  • the invention relates to a separator arranged between a grinder and a boiler to select particle size manufactured by grinding a fuel in the mill and transported by air flow from the mill to the separator and then to the boiler, which extends in an axial direction and which comprises outlet compartments each surmounted by a transport connecting the separator to the boiler, characterized in that a isolation valve is mounted movable inside the separator and is moved in translation in an axial direction to allow or prevent flow from passing through each outlet compartment transport lines.
  • the isolation valve allows the pipes to be closed together transport mounted on the separator outlet compartments. In this way, the number of isolation valves is reduced to the number separators of the grinding plant, regardless of the number of transport lines of each separator.
  • the isolation valve is integral with a tube of valve which communicates with a pressurized enclosure arranged at outside the separator.
  • the isolation valve has two braced blades integral with the valve tube which is provided with openings arranged between the two blades to allow a passage of barrier air and thus overpressure the valve isolation from the outlet compartments to guarantee a perfect seal between the pipes and the separator.
  • the isolation valve has two braced blades integral with the valve tube which is provided with openings arranged at the base of one of the two blades for allow the passage of barrier air and thus overpressure the isolation valve with respect to two compartments of adjacent outlets to ensure a perfect seal between the two corresponding pipes.
  • FIG. 1A shows in section a separator in which a isolation valve mounted movable in translation in a direction axial of the separator occupies an open position.
  • Figure 1B shows in section the separator of Figure 1A, in which the isolation valve occupies a closed position.
  • Figure 2 shows in section the isolation valve with two braced blades integral with a valve tube.
  • Figure 3 shows in partial section two compartments of adjacent outlet in the separator.
  • FIG. 4A shows in partial section a sealing valve barrier air in a separator pressurization enclosure when the isolation valve is in the closed position.
  • FIG. 4B shows in partial section the sealing valve of FIG. 4A when the isolation valve is in the open position.
  • a separator comprises, in FIG. 1, a separator body 1 substantially frustoconical which extends in an axial direction A.
  • the separator is arranged vertically and communicates in its lower part with a grinder through an inlet compartment 3, and in its upper part, with a boiler via a distribution box 5 which includes for example four compartments outlet 7 arranged symmetrically around the axis A of the separator 1.
  • the separator is designed to select the size of coal particles obtained by grinding the fuel in the mill and transported by an air flow from the mill to the separator then to the boiler. It includes an inlet cone 11 surmounted by inner walls 9 to direct the incoming flow 13A towards the top of the separator 1. Fineness flaps 15 select size particles transported by the flow. Those whose size is smaller than a reference size imposed by the flaps are carried by an upward flow 13B channeled by the compartments outlet 7 of the distribution box 5, while the others flow by gravity along the internal walls 9 then inside the inlet cone 11. Flaps 17 mounted on the inlet cone direct these particles to the inlet compartment 3.
  • an isolation valve 21 is mounted movable at inside the separator 1 and is moved in translation along the axial direction A to allow or prevent the passage of air flow and particles through each outlet compartment 7 topped one of the transport lines 19.
  • the isolation valve 21 is conical in shape to seal each outlet compartment 7 in based both on the base 5A of the distribution box 5 and on the four junction edges 7A of the four outlet compartments 7.
  • the isolation valve 21 is integral with a tube valve 23 which slides in a guide bearing 22 according to the axial direction A via a control rod 25 actuated by a pneumatic cylinder 27 mounted outside the separator 1.
  • a single pneumatic cylinder is sufficient to move the isolation valve to open or close the compartments output 7. This saves resources.
  • the valve tube 23 is in communication with an enclosure pressurized 29 which is arranged outside the separator 1 for easily communicate with a barrier air source by via an input 29A.
  • the pressurized enclosure 29 extends in the axial direction A and is fixed to the distribution box 5 to support the pneumatic cylinder 27.
  • the control rod 25 is guided by the guide bearing 22.
  • the isolation valve 21 has two conical braced blades 21A and 21B integral of the valve tube 23.
  • the latter is provided with openings 23A arranged between the two braced blades 21A and 21B to allow a first passage of barrier air injected by the pressurized enclosure 29.
  • the isolation valve 21 is in the closed position. Looks like barrier injected by the pressurized enclosure 29 via the valve tube 23 and the openings 23A and 23B create an overpressure between the two braced blades 21A and 21B in relation to the prevailing pressure in separator 1. For example, the overpressure is equal to 1000Pa. In this way, any passage of a flow between the isolation valve 21 and the base 5A of the distribution box 5, which ensures total tightness. between the separator and each of the transport lines 19.
  • valve tube 23 has openings 23B at the base of one 21A of the two blades braced to allow a second passage of barrier air injected through the pressurized enclosure 29.
  • the isolation valve is in the closed position.
  • the air of dam injected by the pressurized enclosure 29 via the valve tube 23 and the openings 23A and 23B create an overpressure in a groove 7B of each junction edge 7 between two compartments adjacent outlet 7.
  • Overpressure relative to the pressure which reigns in the transport lines 19 is of the same order of magnitude than previously, for example 1000Pa. Of this way, it prevents any passage of a flow between two compartments adjacent, which guarantees a total seal between the two transport lines 19 mounted on these two compartments Release.
  • a valve air barrier 31 is mounted integral with the rod control 25 to isolate the valve tube 23 from the enclosure pressurized 29 when the isolation valve 21 is in position opened.
  • the barrier air sealing valve 31 is formed at the end of the control rod 25 and slides inside a cylinder 33 integral with the valve tube 23.
  • the cylinder 33 has openings 33A and 33B to allow passage of barrier air from the pressurized enclosure 29 inside the valve tube 23.
  • the sealing valve 31 is in the open position and the barrier air can flow towards the isolation valve 21. It is in high stop against the cylinder 33 while being supported by the rod control 25 which has moved under the action of the pneumatic cylinder 27 to place the isolation valve 21 in the closed position.
  • the cylinder 33 is retained against the force of the sealing valve 31 by the tube valve 23 and by the isolation valve 21 which is in abutment against the guide bearing 22.
  • the barrier air sealing valve 31 is in closed position. It is pressed into abutment against the valve tube 23 by the control rod 25 which has moved under the action of the jack pneumatic 27 for placing the isolation valve 21 in position opening hours.
  • the sealing valve 31 prevents the passage of air from barrier in the valve tube 23 when the isolation valve 21 is in the open position, and allows the use of barrier air only when the isolation valve 21 is raised to the closed position. We thus achieves a saving in the barrier air necessary for obtaining a perfect seal between the separator and the compartments of exit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
  • Refuse Collection And Transfer (AREA)
  • Sliding Valves (AREA)

Abstract

An isolation valve (21) moves inside the separator (1) in the axial direction (A) to allow or obstruct the flow (13B) of air carrying the particles through each transport pipe (19) to different outlet compartments (7) The separator is placed between a crusher and a heater to select by size particles made by crushing of a fuel in the crusher and transported by air flow to the separator and then the heater which extends axially. The separator has outlet compartments each with a transport pipe mounted on it connecting the separator to the heater. The isolation valve is fixed to a valve tube (23) which is translated in the axial direction by a control rod (25) operated by a jack (27) mounted outside the separator. The valve tube connects to a pressurized vessel (29) outside the separator with an inlet to communicate with a source of damming air. The isolation valve has two conical layers braced together and fixed to the valve tube which has openings between the layers or at the base of one of the layers. A valve (31) sealing the damming air is fixed to the command rod to isolate the valve tube from the pressurized vessel when the isolation valve is open. The sealing valve slides in a cylinder (33) fixed to the valve tube. The cylinder has openings.

Description

L'invention se rapporte à un séparateur disposé entre un broyeur et une chaudière pour sélectionner en taille des particules fabriquées par broyage d'un combustible dans le broyeur et transportées par flux d'air du broyeur vers le séparateur puis vers la chaudière, qui s'étend suivant une direction axiale et qui comprend des compartiments de sortie surmontés chacun d'une conduite de transport reliant le séparateur à la chaudière.The invention relates to a separator arranged between a grinder and a boiler to select the size of the particles produced by grinding a fuel in the crusher and transported by flow of air from the grinder to the separator then to the boiler, which extends in an axial direction and which comprises compartments of outlet each surmounted by a transport pipe connecting the separator at the boiler.

Un tel séparateur est utilisé notamment pour séparer des particules de charbon et permettre l'alimentation de la chaudière en particules ayant une taille inférieure à une taille de référence. Les particules dont la taille excède la taille de référence sont recyclées vers le broyeur pour être broyées à nouveau avec le charbon de départ.Such a separator is used in particular for separating particles of coal and allow the boiler to be supplied with particles smaller than a reference size. The particles larger than the reference size are recycled to the crusher to be ground again with charcoal departure.

Le transport des particules depuis le broyeur vers le séparateur puis vers la chaudière est effectué par flux d'air canalisé par des conduites de transport. Il est connu d'alimenter le foyer de la chaudière par l'intermédiaire de plusieurs conduites. Pour cette raison, le séparateur présente habituellement des compartiments de sortie qui sont surmontés chacun d'une conduite de transport reliant le séparateur à la chaudière.Transport of particles from the crusher to the separator then towards the boiler is carried out by air flow channeled by transport lines. It is known to feed the home of the boiler through several pipes. For this reason, the separator usually has compartments of outlet which are each surmounted by a transport pipe connecting the separator at the boiler.

Dans des installations de broyage existantes, on a prévu d'isoler la chaudière du séparateur en disposant des trappes d'isolement sur chaque conduite, de préférence à la sortie du séparateur. De manière connue, chaque trappe fonctionne en surpression d'air de barrage par rapport à la pression amont et aval de la conduite sur laquelle elle est montée pour la fermer avec une étanchéité parfaite.In existing crushing plants, provision has been made to isolate the separator boiler by having isolation hatches on each line, preferably at the outlet of the separator. So known, each hatch operates in barrier air overpressure by relative to the upstream and downstream pressure of the pipe on which it is mounted to close it with a perfect seal.

Les conduites de transport reliant le séparateur à la chaudière sont fermées lors de certaines opérations de fonctionnement.Transport lines connecting the separator to the boiler are closed during certain operating operations.

Cependant, l'utilisation d'une trappe d'isolement pour chaque conduite de transport se révèle peu économique par rapport à l'ensemble de l'installation de broyage. Le coût proportionnellement élevé de l'isolement des conduites résulte du coût unitaire d'une trappe, qui inclut la mise en oeuvre de l'étanchéité par barrage d'air, et du nombre de trappes par installation de broyage.However, the use of an isolation hatch for each transport line is not very economical compared to the whole grinding installation. The cost proportionally high insulation of pipes results from the unit cost of a hatch, which includes the implementation of air barrier sealing, and the number of hatches per grinding installation.

Le but de l'invention est de réduire le coût de l'isolement des conduites de transport qui relient un séparateur de particules combustibles à une chaudière dans une installation de broyage.The object of the invention is to reduce the cost of isolating the transport lines which connect a particle separator fuel to a boiler in a grinding plant.

L'idée à la base de l'invention est de réduire le nombre de trappes.The idea behind the invention is to reduce the number of hatches.

A cet effet, l'invention a pour objet un séparateur disposé entre un broyeur et une chaudière pour sélectionner en taille des particules fabriquées par broyage d'un combustible dans le broyeur et transportées par flux d'air du broyeur vers le séparateur puis vers la chaudière, qui s'étend suivant une direction axiale et qui comprend des compartiments de sortie surmontés chacun d'une conduite de transport reliant le séparateur à la chaudière, caractérisé en ce qu'un clapet d'isolement est monté mobile à l'intérieur du séparateur et est déplacé en translation suivant une direction axiale pour autoriser ou empêcher le passage du flux à travers chaque compartiment de sortie des conduites de transport.To this end, the invention relates to a separator arranged between a grinder and a boiler to select particle size manufactured by grinding a fuel in the mill and transported by air flow from the mill to the separator and then to the boiler, which extends in an axial direction and which comprises outlet compartments each surmounted by a transport connecting the separator to the boiler, characterized in that a isolation valve is mounted movable inside the separator and is moved in translation in an axial direction to allow or prevent flow from passing through each outlet compartment transport lines.

Le clapet d'isolement permet de fermer ensemble les conduites de transport montées sur les compartiments de sortie du séparateur. De cette façon, on réduit le nombre de clapets d'isolement au nombre de séparateurs de l'installation de broyage, quel que soit le nombre de conduites de transport de chaque séparateur.The isolation valve allows the pipes to be closed together transport mounted on the separator outlet compartments. In this way, the number of isolation valves is reduced to the number separators of the grinding plant, regardless of the number of transport lines of each separator.

De préférence, le clapet d'isolement est solidaire d'un tube de clapet qui communique avec une enceinte pressurisée disposée à l'extérieur du séparateur.Preferably, the isolation valve is integral with a tube of valve which communicates with a pressurized enclosure arranged at outside the separator.

Selon un premier avantage de l'invention, le clapet d'isolement possède deux lames entretoisées solidaires du tube de clapet qui est muni d'ouvertures disposées entre les deux lames pour permettre un passage de l'air de barrage et mettre ainsi en surpression le clapet d'isolement par rapport aux compartiments de sortie afin de garantir une étanchéité parfaite entre les conduites et le séparateur.According to a first advantage of the invention, the isolation valve has two braced blades integral with the valve tube which is provided with openings arranged between the two blades to allow a passage of barrier air and thus overpressure the valve isolation from the outlet compartments to guarantee a perfect seal between the pipes and the separator.

Selon un deuxième avantage de l'invention, le clapet d'isolement possède deux lames entretoisées solidaires du tube de clapet qui est muni d'ouvertures disposées à la base de l'une des deux lames pour permettre un passage de l'air de barrage et ainsi mettre en surpression le clapet d'isolement par rapport à deux compartiments de sortie adjacents afin de garantir une étanchéité parfaite entre les deux conduites correspondantes.According to a second advantage of the invention, the isolation valve has two braced blades integral with the valve tube which is provided with openings arranged at the base of one of the two blades for allow the passage of barrier air and thus overpressure the isolation valve with respect to two compartments of adjacent outlets to ensure a perfect seal between the two corresponding pipes.

D'autres caractéristiques et avantages de l'invention apparaítront à la lecture de la description d'un mode de réalisation de l'invention illustrés par les dessins.Other characteristics and advantages of the invention will appear on reading the description of an embodiment of the invention illustrated by the drawings.

La figure 1A montre en coupe un séparateur dans lequel un clapet d'isolement monté mobile en translation suivant une direction axiale du séparateur occupe une position d'ouverture.FIG. 1A shows in section a separator in which a isolation valve mounted movable in translation in a direction axial of the separator occupies an open position.

La figure 1B montre en coupe le séparateur de la figure 1A, dans lequel le clapet d'isolement occupe une position de fermeture.Figure 1B shows in section the separator of Figure 1A, in which the isolation valve occupies a closed position.

La figure 2 montre en coupe le clapet d'isolement avec deux lames entretoisées solidaires d'un tube de clapet.Figure 2 shows in section the isolation valve with two braced blades integral with a valve tube.

La figure 3 montre en coupe partielle deux compartiments de sortie adjacents dans le séparateur.Figure 3 shows in partial section two compartments of adjacent outlet in the separator.

La figure 4A montre en coupe partielle un clapet d'étanchéité d'air de barrage dans une enceinte de pressurisation du séparateur lorsque le clapet d'isolement est en position fermée.FIG. 4A shows in partial section a sealing valve barrier air in a separator pressurization enclosure when the isolation valve is in the closed position.

La figure 4B montre en coupe partielle le clapet d'étanchéité de la figure 4A lorsque le clapet d'isolement est en position ouverte.FIG. 4B shows in partial section the sealing valve of FIG. 4A when the isolation valve is in the open position.

Un séparateur comprend, figure 1, un corps de séparateur 1 sensiblement tronconique qui s'étend suivant une direction axiale A. Dans une installation de broyage non représentée, le séparateur est disposé verticalement et communique dans sa partie inférieure avec un broyeur par l'intermédiaire d'un compartiment d'entrée 3, et dans sa partie supérieure, avec une chaudière par l'intermédiaire d'une boíte de répartition 5 qui comprend par exemple quatre compartiments de sortie 7 agencés symétriquement autour de l'axe A du séparateur 1.A separator comprises, in FIG. 1, a separator body 1 substantially frustoconical which extends in an axial direction A. In a grinding installation not shown, the separator is arranged vertically and communicates in its lower part with a grinder through an inlet compartment 3, and in its upper part, with a boiler via a distribution box 5 which includes for example four compartments outlet 7 arranged symmetrically around the axis A of the separator 1.

Le séparateur est conçu pour sélectionner en taille des particules de charbon obtenues par broyage du combustible dans le broyeur et transportées par un flux d'air du broyeur vers le séparateur puis vers la chaudière. Il comprend un cône d'entrée 11 surmonté de parois intérieures 9 pour diriger le flux entrant 13A vers le sommet du séparateur 1. Des volets de finesse 15 opèrent une sélection en taille des particules transportées par le flux. Celles dont la taille est inférieure à une taille de référence imposée par les volets sont emportées par un flux ascendant 13B canalisé par les compartiments de sortie 7 de la boíte de répartition 5, tandis que les autres s'écoulent par gravité le long des parois internes 9 puis à l'intérieur du cône d'entrée 11. Des volets 17 montés sur le cône d'entrée dirigent ces particules vers le compartiment d'entrée 3.The separator is designed to select the size of coal particles obtained by grinding the fuel in the mill and transported by an air flow from the mill to the separator then to the boiler. It includes an inlet cone 11 surmounted by inner walls 9 to direct the incoming flow 13A towards the top of the separator 1. Fineness flaps 15 select size particles transported by the flow. Those whose size is smaller than a reference size imposed by the flaps are carried by an upward flow 13B channeled by the compartments outlet 7 of the distribution box 5, while the others flow by gravity along the internal walls 9 then inside the inlet cone 11. Flaps 17 mounted on the inlet cone direct these particles to the inlet compartment 3.

La communication entre le broyeur et le séparateur est assurée par une conduite de transport à double enveloppe pour transporter les particules recyclées à la périphérie de la conduite et le flux initial d'air et de particules au centre de la conduite.Communication between the shredder and the separator is ensured by a double-walled transport pipe to transport the recycled particles at the periphery of the pipe and the initial air flow and particles in the center of the pipe.

La communication entre le séparateur et la chaudière est assurée par quatre conduites de transport 19 représentées en pointillés sur les figures 1A et 1B, chacune étant fixée à un compartiment de sortie 7 de la boíte de répartition 5. Comme indiqué précédemment, les quatre conduites sont destinées à alimenter le foyer de la chaudière en quatre points distincts. Communication between the separator and the boiler is provided by four transport lines 19 shown in dotted in Figures 1A and 1B, each being attached to a outlet compartment 7 of the distribution box 5. As indicated previously, the four lines are intended to supply the boiler focus at four separate points.

Selon l'invention, un clapet d'isolement 21 est monté mobile à l'intérieur du séparateur 1 et est déplacé en translation suivant la direction axiale A pour autoriser ou empêcher le passage du flux d'air et de particules à travers chaque compartiment de sortie 7 surmonté d'une des conduites de transport 19.According to the invention, an isolation valve 21 is mounted movable at inside the separator 1 and is moved in translation along the axial direction A to allow or prevent the passage of air flow and particles through each outlet compartment 7 topped one of the transport lines 19.

Dans l'exemple des figures 1A et 1B, le clapet d'isolement 21 est de forme conique pour obturer chaque compartiment de sortie 7 en s'appuyant à la fois sur la base 5A de la boíte de répartition 5 et sur les quatre arêtes de jonction 7A des quatre compartiments de sortie 7.In the example of FIGS. 1A and 1B, the isolation valve 21 is conical in shape to seal each outlet compartment 7 in based both on the base 5A of the distribution box 5 and on the four junction edges 7A of the four outlet compartments 7.

De cette façon, le déplacement du clapet d'isolement d'une position d'ouverture, figure 1A, vers une position de fermeture, figure 1B, permet de fermer les quatre compartiments de sortie ensemble indépendamment du nombre de conduites de transport reliant le séparateur à la chaudière.In this way, the displacement of the isolation valve of a open position, Figure 1A, to a closed position, Figure 1B, allows the four outlet compartments to be closed together regardless of the number of transport lines connecting the separator at the boiler.

Figures 1A et 1B, le clapet d'isolement 21 est solidaire d'un tube de clapet 23 qui coulisse dans un palier de guidage 22 suivant la direction axiale A par l'intermédiaire d'une tige de commande 25 actionnée par un vérin pneumatique 27 monté à l'extérieur du séparateur 1. De cette façon, un vérin pneumatique unique suffit pour déplacer le clapet d'isolement pour ouvrir ou fermer les compartiments de sortie 7. On réalise ainsi une économie de moyens.Figures 1A and 1B, the isolation valve 21 is integral with a tube valve 23 which slides in a guide bearing 22 according to the axial direction A via a control rod 25 actuated by a pneumatic cylinder 27 mounted outside the separator 1. In this way, a single pneumatic cylinder is sufficient to move the isolation valve to open or close the compartments output 7. This saves resources.

Le tube de clapet 23 est en communication avec une enceinte pressurisée 29 qui est disposée à l'extérieur du séparateur 1 pour communiquer facilement avec une source d'air de barrage par l'intermédiaire d'une entrée 29A.The valve tube 23 is in communication with an enclosure pressurized 29 which is arranged outside the separator 1 for easily communicate with a barrier air source by via an input 29A.

Dans l'exemple des figures 1A et 1B, l'enceinte pressurisée 29 s'étend dans la direction axiale A et est fixée à la boíte de répartition 5 pour servir de support au vérin pneumatique 27. La tige de commande 25 est guidée par le palier de guidage 22. In the example of FIGS. 1A and 1B, the pressurized enclosure 29 extends in the axial direction A and is fixed to the distribution box 5 to support the pneumatic cylinder 27. The control rod 25 is guided by the guide bearing 22.

Selon un premier avantage de l'invention, le clapet d'isolement 21 possède deux lames coniques entretoisées 21A et 21B solidaires du tube de clapet 23. Ce dernier est muni d'ouvertures 23A disposées entre les deux lames entretoisées 21A et 21B pour permettre un premier passage de l'air de barrage injecté par l'enceinte pressurisée 29.According to a first advantage of the invention, the isolation valve 21 has two conical braced blades 21A and 21B integral of the valve tube 23. The latter is provided with openings 23A arranged between the two braced blades 21A and 21B to allow a first passage of barrier air injected by the pressurized enclosure 29.

Figure 2, le clapet d'isolement 21 est en position fermée. L'air de barrage injecté par l'enceinte pressurisée 29 via le tube de clapet 23 et les ouvertures 23A et 23B crée une surpression entre les deux lames entretoisées 21A et 21B par rapport à la pression qui règne dans le séparateur 1. A titre d'exemple, la surpression est égale à 1000Pa. De cette façon, on empêche tout passage d'un flux entre le clapet d'isolement 21 et la base 5A de la boíte de répartition 5, ce qui permet de garantir une étanchéité totale. entre le séparateur et chacune des conduites de transport 19.Figure 2, the isolation valve 21 is in the closed position. Looks like barrier injected by the pressurized enclosure 29 via the valve tube 23 and the openings 23A and 23B create an overpressure between the two braced blades 21A and 21B in relation to the prevailing pressure in separator 1. For example, the overpressure is equal to 1000Pa. In this way, any passage of a flow between the isolation valve 21 and the base 5A of the distribution box 5, which ensures total tightness. between the separator and each of the transport lines 19.

Selon un deuxième avantage de l'invention, le tube de clapet 23 possède des ouvertures 23B à la base de l'une 21A des deux lames entretoisées pour permettre un deuxième passage de l'air de barrage injecté par l'enceinte pressurisée 29.According to a second advantage of the invention, the valve tube 23 has openings 23B at the base of one 21A of the two blades braced to allow a second passage of barrier air injected through the pressurized enclosure 29.

Figures 2 et 3, le clapet d'isolement est en position fermée. L'air de barrage injecté par l'enceinte pressurisée 29 via le tube de clapet 23 et les ouvertures 23A et 23B crée une surpression dans une rainure 7B de chaque arête de jonction 7 entre deux compartiments de sortie adjacents 7. La surpression par rapport à la pression qui règne dans les conduites de transport 19 est du même ordre de grandeur que précédemment, soit par exemple 1000Pa. De cette façon, on empêche tout passage d'un flux entre deux compartiments adjacents, ce qui permet de garantir une étanchéité totale entre les deux conduites de transport 19 montées sur ces deux compartiments de sortie. Figures 2 and 3, the isolation valve is in the closed position. The air of dam injected by the pressurized enclosure 29 via the valve tube 23 and the openings 23A and 23B create an overpressure in a groove 7B of each junction edge 7 between two compartments adjacent outlet 7. Overpressure relative to the pressure which reigns in the transport lines 19 is of the same order of magnitude than previously, for example 1000Pa. Of this way, it prevents any passage of a flow between two compartments adjacent, which guarantees a total seal between the two transport lines 19 mounted on these two compartments Release.

Selon un troisième avantage de l'invention, un clapet d'étanchéité d'air de barrage 31 est monté solidaire de la tige de commande 25 pour isoler le tube de clapet 23 de l'enceinte pressurisée 29 lorsque le clapet d'isolement 21 est en position ouverte.According to a third advantage of the invention, a valve air barrier 31 is mounted integral with the rod control 25 to isolate the valve tube 23 from the enclosure pressurized 29 when the isolation valve 21 is in position opened.

Le clapet d'étanchéité d'air de barrage 31 est formé à l'extrémité de la tige de commande 25 et coulisse à l'intérieur d'un cylindre 33 solidaire du tube de clapet 23. Le cylindre 33 possède des ouvertures 33A et 33B pour permettre un passage de l'air de barrage de l'enceinte pressurisée 29 à l'intérieur du tube de clapet 23.The barrier air sealing valve 31 is formed at the end of the control rod 25 and slides inside a cylinder 33 integral with the valve tube 23. The cylinder 33 has openings 33A and 33B to allow passage of barrier air from the pressurized enclosure 29 inside the valve tube 23.

Figure 4A, le clapet d'étanchéité 31 est en position ouverte et l'air de barrage peut se diriger vers le clapet d'isolement 21. Il est en butée haute contre le cylindre 33 en étant soutenu par la tige de commande 25 qui s'est déplacée sous l'action du vérin pneumatique 27 pour placer le clapet d'isolement 21 en position fermée. Le cylindre 33 est retenu contre l'effort du clapet d'étanchéité 31 par le tube de clapet 23 et par le clapet d'isolement 21 qui est en butée contre le palier de guidage 22.4A, the sealing valve 31 is in the open position and the barrier air can flow towards the isolation valve 21. It is in high stop against the cylinder 33 while being supported by the rod control 25 which has moved under the action of the pneumatic cylinder 27 to place the isolation valve 21 in the closed position. The cylinder 33 is retained against the force of the sealing valve 31 by the tube valve 23 and by the isolation valve 21 which is in abutment against the guide bearing 22.

Figure 4B, le clapet d'étanchéité d'air de barrage 31 est en position fermée. Il est pressé en butée contre le tube de clapet 23 par la tige de commande 25 qui s'est déplacée sous l'action du vérin pneumatique 27 pour placer le clapet d'isolement 21 en position d'ouverture.Figure 4B, the barrier air sealing valve 31 is in closed position. It is pressed into abutment against the valve tube 23 by the control rod 25 which has moved under the action of the jack pneumatic 27 for placing the isolation valve 21 in position opening hours.

Le clapet d'étanchéité 31 empêche le passage de l'air de barrage dans le tube de clapet 23 lorsque le clapet d'isolement 21 est en position ouverte, et permet de n'utiliser l'air de barrage que lorsque l'on remonte le clapet d'isolement 21 en position de fermeture. On réalise ainsi une économie de l'air de barrage nécessaire à l'obtention d'une étanchéité parfaite entre le séparateur et les compartiments de sortie.The sealing valve 31 prevents the passage of air from barrier in the valve tube 23 when the isolation valve 21 is in the open position, and allows the use of barrier air only when the isolation valve 21 is raised to the closed position. We thus achieves a saving in the barrier air necessary for obtaining a perfect seal between the separator and the compartments of exit.

Claims (8)

Un séparateur (1) destiné à être disposé entre un broyeur et une chaudière pour sélectionner en taille des particules fabriquées par broyage d'un combustible dans le broyeur et transportées par flux d'air du broyeur vers le séparateur puis vers la chaudière, qui s'étend suivant une direction axiale (A) et qui comprend des compartiments de sortie (7) surmontés chacun d'une conduite de transport (19) reliant le séparateur (1) à la chaudière, caractérisé en ce qu'un clapet d'isolement (21) est monté mobile à l'intérieur du séparateur (1) et est déplacé en translation suivant la direction axiale (A) pour autoriser ou empêcher le passage du flux (13B) à travers chaque compartiment de sortie (7) des conduites de transport (19).A separator (1) intended to be disposed between a grinder and a boiler to select the size of the particles produced by grinding a fuel in the crusher and transported by flow of air from the grinder to the separator then to the boiler, which extends in an axial direction (A) and which comprises compartments of outlet (7) each surmounted by a transport pipe (19) connecting the separator (1) at the boiler, characterized in that a valve isolation (21) is movably mounted inside the separator (1) and is moved in translation in the axial direction (A) to allow or prevent the flow (13B) from passing through each compartment of outlet (7) of the transport lines (19). Un séparateur selon la revendication 1, dans lequel le clapet d'isolement (21) est solidaire d'un tube de clapet (23) qui est déplacé en translation suivant la direction axiale (A) par l'intermédiaire d'une tige de commande (25) actionnée par un vérin (27) monté à l'extérieur du séparateur (1).A separator according to claim 1, wherein the isolation valve (21) is integral with a valve tube (23) which is moved in translation in the axial direction (A) via a control rod (25) actuated by a jack (27) mounted at the exterior of the separator (1). Un séparateur selon la revendication 2, dans lequel le tube de clapet (23) communique avec une enceinte pressurisée (29) disposée à l'extérieur du séparateur (1) et ayant une entrée (29A) pour communiquer avec une source d'air de barrage.A separator according to claim 2, in which the tube valve (23) communicates with a pressurized enclosure (29) arranged outside the separator (1) and having an inlet (29A) to communicate with a barrier air source. Un séparateur selon la revendication 3, dans lequel le clapet d'isolement (21) possède deux lames coniques entretoisées (21A,21B) solidaires du tube de clapet (23) qui est muni d'ouvertures (23A) disposées entre les deux lames entretoisées.A separator according to claim 3, wherein the isolation valve (21) has two braced conical blades (21A, 21B) integral with the valve tube (23) which is provided with openings (23A) arranged between the two braced blades. Un séparateur selon la revendication 3, dans lequel le tube de clapet (23) possède des ouvertures (23B) à la base de l'une (21A) des deux lames entretoisées du clapet. A separator according to claim 3, wherein the tube valve (23) has openings (23B) at the base of one (21A) of the two braced blades of the valve. Un séparateur selon l'une des revendications 3 à 5, dans lequel un clapet d'étanchéité d'air de barrage (31) est monté solidaire de la tige de commande (25) pour isoler le tube de clapet (23) de l'enceinte pressurisée (29) lorsque le clapet d'isolement (21) est en position ouverte.A separator according to one of claims 3 to 5, in which a barrier air sealing valve (31) is mounted integral of the control rod (25) to isolate the valve tube (23) from the pressurized enclosure (29) when the isolation valve (21) is in open position. Un séparateur selon la revendication 6, dans lequel le clapet d'étanchéité (31) coulisse à l'intérieur d'un cylindre (33) solidaire du tube de clapet (23).A separator according to claim 6, wherein the sealing valve (31) slides inside a cylinder (33) integral with the valve tube (23). Un séparateur selon la revendication 7, dans lequel le cylindre (33) possède des ouvertures (33A,33B)A separator according to claim 7, wherein the cylinder (33) has openings (33A, 33B)
EP99400925A 1998-04-16 1999-04-15 Separator for combustible particles above a boiler with valve Expired - Lifetime EP0950856B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9804749 1998-04-16
FR9804749A FR2777476B1 (en) 1998-04-16 1998-04-16 COMBUSTIBLE PARTICLE SEPARATOR PROVIDED UPSTREAM OF A BOILER AND INCLUDING A SINGLE ISOLATION VALVE

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EP0950856A1 true EP0950856A1 (en) 1999-10-20
EP0950856B1 EP0950856B1 (en) 2003-08-06

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EP99400925A Expired - Lifetime EP0950856B1 (en) 1998-04-16 1999-04-15 Separator for combustible particles above a boiler with valve

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US (1) US6231273B1 (en)
EP (1) EP0950856B1 (en)
JP (1) JPH11347494A (en)
DE (1) DE69910104D1 (en)
ES (1) ES2203027T3 (en)
FR (1) FR2777476B1 (en)
ZA (1) ZA992746B (en)

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Also Published As

Publication number Publication date
EP0950856B1 (en) 2003-08-06
FR2777476B1 (en) 2000-06-23
ZA992746B (en) 2000-01-31
JPH11347494A (en) 1999-12-21
ES2203027T3 (en) 2004-04-01
DE69910104D1 (en) 2003-09-11
US6231273B1 (en) 2001-05-15
FR2777476A1 (en) 1999-10-22

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