EP0073830B1 - Bruleur - Google Patents

Bruleur Download PDF

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Publication number
EP0073830B1
EP0073830B1 EP82901239A EP82901239A EP0073830B1 EP 0073830 B1 EP0073830 B1 EP 0073830B1 EP 82901239 A EP82901239 A EP 82901239A EP 82901239 A EP82901239 A EP 82901239A EP 0073830 B1 EP0073830 B1 EP 0073830B1
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EP
European Patent Office
Prior art keywords
chamber
oxidiser
combustion
fuel
head end
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.)
Expired
Application number
EP82901239A
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German (de)
English (en)
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EP0073830A1 (fr
EP0073830A4 (fr
Inventor
John A. Hardgrove
Charles L. Dailey
Hideo Iwata
Douglas B. Sheppard
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Northrop Grumman Space and Mission Systems Corp
Original Assignee
TRW Inc
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Publication of EP0073830A4 publication Critical patent/EP0073830A4/fr
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Publication of EP0073830B1 publication Critical patent/EP0073830B1/fr
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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 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/006—Combustion apparatus characterised by the shape of the combustion chamber the chamber being arranged for cyclonic combustion
    • F23C3/008—Combustion apparatus characterised by the shape of the combustion chamber the chamber being arranged for cyclonic combustion for pulverulent fuel
    • 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 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
    • 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 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/02—Disposition of air supply not passing through burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • F23J1/08—Liquid slag removal

Definitions

  • This invention relates generally to fuel combustors, and, more particularly, to a slagging combustor in which the fuel is pulverized coal.
  • the fuel is pulverized coal.
  • non-combustible ash and mineral components cannot be allowed to accumulate within the combustion chamber, or serious operational problems will be experienced.
  • the temperature in the chamber is maintained high enough to allow the slag to be removed in liquid form by the action of shear forces and/or gravitational forces acting on the slag.
  • This slagging capability will also have benefits related to operation of downstream equipment interacting with the product flowstream.
  • a slagging combustor may have different requirements, such as overall stoichiometry, imposed on it by the characteristics of a downstream process utilizing the products of combustion.
  • an ideal slagging combustor should have good slag recovery characteristics and should operate at a relattively low temperature, to minimize heat losses and maximize efficiency.
  • the degree of combustion of the coal in a slagging combustor will depend in part on the intended application of the gaseous products of combustion. For example, if the combustor is to be employed to produce gas for use as a fuel in a conventional power generation plant, or in chemical processes, the gases exiting from the combustion chamber should still be relatively rich in combustibles. Accordingly, if a coal combustor is to be used as such a gas generator, the combustion process should take place in a relatively fuel-rich environment. In terms of stoichiometry, a stoichiometric ratio as low as 0.3 might be desirable for subsequent combustion in a boiler or use as feed stock in a chemical process.
  • the gas were to be immediately employed in a combustion or heat exchange process, it might be desirable to provide a gas at a higher temperature, but with a lower equivalent heat value in the combustibles in the gas. This could be done by more completely combusting the coal in the slagging combustor, i.e. at a higher stoichiometric ratio.
  • the desired stoichiometry of a slagging combustor would be substantially different if the output gases were to be used in a magnetohydrodynamic (MHD) electric power generator.
  • An MHD generator utilizes a high-temperature, high-velocity plasma which is passed through a magnetic field to generate electricity directly, without the use of rotating machinery.
  • the gaseous products from the slagging combustion stage may be lower in combustibles content and higher in temperature and heat content.
  • the products of combustion may then be subject to further combustion after leaving the slagging combustor. Additional oxidizer, and sometimes additional fuel, may be added to the exiting gases for this purpose.
  • the slagging combustor should still ideally provide good slag recovery and relatively low operating temperatures.
  • the desired stoichiometry of the combustion process will depend on the requirements of the downstream application. Acceptable combustor operation and combustion product properties will also be dependent on the temperature and composition of the oxidizer gas, and the type and size of the coal particles. Selection of the appropriate parameters, to satisfy the requirements of the downstream application, typically involves a number of practical design trade-offs. For example, preheating the oxidizer gas to a higher temperature and thereby permitting reactions at a lower stoichiometric ratio might still meet the requirements of the downstream application, but would obviously require either the consumption of more energy in the preheating stage or the addition of a heat exchanger. The first of these alternatives may or may not comport with the overall energy requirements of the application, and the second may not even be feasible.
  • the stoichiometric ratio in a slagging combustor is of critical importance to the rate of slag recovery. If the ratio is too low, temperatures will also tend to be low, and the slag may not liquify sufficiently to facilitate recovery. Conversely, if the ratio is too high, the temperature may be so high that a significant proportion of the slag is lost by vaporization. In theory at least, the effective slagging range has been thought to lie about 0.4 and up to 1.0 for the combustor as a whole. However, the stoichiometry desired to meet the requirements of the downstream application may not fall within this theoretical slagging range. For example, if the combustor is to act as a gas generator, a stoichiometric ratio as low as 0.3 might be preferred.
  • a coal combustor of this general type should ideally be capable of matching the overall combustor stoichiometry, and other characteristics of the slagging combustor, with the requirements of the downstream application of the combustor.
  • the slagging combustor should provide a high rate of slag recovery, a relatively low heat loss, and therefore a relatively high thermal efficiency.
  • prior art combustors it has not been possible to satisfy all of these objectives simultaneously. For example, good slag recovery, in conventional combustors, is not consistent with a relatively low temperature and low stoichiometric ratio.
  • a fuel combustor comprising a combustion chamber having a head end and an opposite exit end, fuel inlet means for feeding particulate solid fuel into said chamber at said head end, oxidizer inlet means for feeding oxidizer into the chamber in a substantially tangential direction to produce high velocity rotational flow within the chamber, an outlet for exhausting combustion products from the exit end of said chamber, a slagging baffle between said ends and a slag tap for removing slag from said chamber; said com- 'bustor being characterised in that said oxidizer inlet means is located between said ends and is adapted to effect flow of a portion of the oxidizer toward said head end of said chamber and flow of the remainder of the entering oxidizer toward said exit end of the chamber in such proportions that said fuel and said oxidizer portion react within said head end of the chamber in a first phase of combustion at a relatively low stoichiometric ratio and a correspondingly low temperature to allow liquefaction of the slag content
  • the present invention resides in a slagging coal combustor, having a head end and an exit end, in which oxidizer is introduced in such a manner that at least a portion of it flows away from the exit end and toward the head end, coal being introduced into the oxidizer flowing toward the head end, to provide an initial phase of combustion in the head end. Combustion in this first phase can take place at a stoichiometric ratio much less than that of the combustor as a whole.
  • the invention has application as well to combustors of other fuels.
  • the essential elements of the invention in its broadest sense are means for introducing oxidizer in such a manner that a portion of it flows toward the head end, and means for injecting fuel into this oxidizer portion to provide the first phase of combustion in the head end.
  • the means for injecting oxidizer gas and pulverized coal are so configured that a portion of the oxidizer gas stream flows toward the head end of the chamber and is there reacted with the coal fuel in the first phase of combustion.
  • gases from the first phase of combustion are further combusted with the remaining portion of the oxidizer gas, which flows toward the exit end of the chamber.
  • the stoichiometric ratio in the first phase of combustion in the head end which is approximately one half of the overall ratio for the combustor, may, for example, be as low as 0.3 for some designs. Contrary to generally accepted practice with respect to effective slag removal, extremely good slag removal characteristics can be obtained in this low stoichiometric range.
  • the combustor of the invention When used for supplying high-temperature gases to an MHD generator, the combustor of the invention operates at an overall stoichiometric ratio selected to provide the best combination of slag recovery characteristics in the head end and exit gas conditions matching the requirements of the MHD generator. In a presently preferred embodiment, an overall ratio of approximately 0.6 is used, with a ratio of approximately 0.3 in the head end.
  • the oxidizer gas when introduced tangentially into the combustion chamber, splits into two streams.
  • One stream has an axial velocity component directed toward the exit end of the chamber while the other portion has an axial velocity component directed toward the head end, into which the fuel is injected.
  • the two streams are approximately equal in volumetric flow rates. Because the fuel is initially combusted with a relatively low volume of oxidizer, first-phase combustion at the head end of the chamber takes place at a relatively low stoichiometric ratio. There is a correspondingly low reaction temperature and a relatively high efficiency, because of the reduced heat loss at the lower temperature. However, highly effective slag removal is obtained in these conditions.
  • the slagging stage is more efficient thermodynamically, and provides excellent slag recovery. Unburned gases from the first combustion phase then react with the remaining or exit-end stream of the oxidizer gas, and this second phase of combustion takes place at a higher stoichiometric ratio.
  • the overall ratio can be approximately 0.6 to 0.9, with a corresponding head-end ratio of 0.3 to 0.45. Because of a relatively high temperature in the exit end, it may be made relatively shorter in length than is possible in a conventional combustor of the same type. This reduces the heat loss from the chamber and improves the overall thermodynamic efficiency of the combustor.
  • Coal injection into the first-phase combustion zone can be effected by a pintle nozzle disposed axially in the head end and directing fuel flow into that portion of the oxidizer gas flowing toward the head end.
  • fuel can be injected through fuel inlets disposed peripherally around the chamber, to direct the flow into the head-end portion of the oxidizer gas flow.
  • the means for removing slag from the chamber includes a slag port disposed at the bottom portion of the cylindrical wall of the chamber.
  • the head end of the chamber is the lowermost end and the exit is the uppermost.
  • the slag port is located at the head-end.
  • the invention in its broadest terms comprises the steps of injecting oxidizer gas peripherally into a chamber having a head end and an exit end, in such a manner that a portion of the flow is directed towards the head end, injecting fuel, such as pulverized coal, into the head end in such a manner that combustion takes place initially at a relatively low stoichiometric ratio and low temperature, regardless of the end use of the gaseous products of combustion and regardless of the overall stoichiometry of the combustor, removing any non-combustible slag from the chamber, and allowing the essentially gaseous products of combustion to exit the chamber.
  • fuel such as pulverized coal
  • the steps of injecting oxidizer gas and injecting pulverized coal include injecting the oxidizer gas tangentially into the chamber at a point between the head end and the exit end of the chamber such that the oxidizer gas flow splits into two approximately equal portions having opposite axial components, and injecting the pulverized coal into the oxidizer gas portion flowing toward the head end, wherein a first phase of combustion occurs in the head end at a stoichiometric ratio of approximately one half of the overall stoichiometric ratio for the combustor.
  • the present invention represents a significant advance in the field of coal combustion and gasification.
  • a novel coal combustor achieves good slag removal rates while attaining high thermodynamic efficiency, low heat loss and complete burning of carbon.
  • the combustor of the invention allows for convenient matching of its thermodynamic characteristics with those of a desired downstream process.
  • the present invention is principally concerned with a pulverized coal combustor, and more particularly with a slagging coal combustor.
  • slagging coal combustors the non-combustible ash and mineral components of the coal are removed in liquid form, so that these constituents do not remain in the gases produced by the combustor.
  • a coal combustor should be adaptable to provide gas to an MHD generator, or to provide fuel gas for subsequent burning in boilers or in other chemical processes, and still should maintain a high rate of slag recovery and a high thermal efficiency.
  • Prior coal combustors have traditionally employed an oxidizer flow pattern having an axial component directed towards the exit end, and have not been able to achieve the desired combination of ideal characteristics.
  • a coal combustor is provided with fuel and oxidizer injection means which cooperate in such a manner that combustion takes place initially in the head end of the combustor at a relatively low stoichiometric ratio, regardless of the end use of the gaseous products of combustion and regardless of the overall stoichiometry of the combustor.
  • Extremely good slag recovery is provided at the relatively low local stoichiometric ratio in the head end, and heat losses are minimized, with a corresponding maximization of efficiency.
  • a second combustion phase may optionally be provided to yield a higher overall stoichiometric ratio, for use in conjunction with an MHD generator, for example. If the second combustion phase is omitted, a relatively low overall stoichiometric ratio is then provided, such as when the combustor is operating as a synthesis gas generator.
  • the apparatus of the invention includes a slagging coal combustor, indicated generally by reference numeral 10, and having a tangential oxidizer inlet 12 and an axial coal inlet 14.
  • the combustor 10 comprises a generally cylindrical reaction chamber 16, shown as being disposed with its longitudinal axis horizontal, the cylinder having an exit end 18 through which the products of combustion leave the chamber, and a head end 20 into which the pulverized coal fuel is introduced.
  • the exit end 18 includes an exit assembly 22 usually referred to as the symmetrical type.
  • a symmetrical exit is one in which the exit path followed by the products of combustion is symmetrical with respect to the axis of the combustor, i.e. the exit path extends from the center of the exit assembly, rather than being tangential or volute.
  • the illustrative embodiment of Fig. 1 also includes a further exit combustion stage 24 into which further oxidizer and/or fuel may be introduced, through the inlet 26.
  • This exit stage 24 is illustrative of a typical environment for the combustor, but is not essential to the present invention, since the slagging combustor will operate equally well without the exit stage.
  • unburned minerals or ash are removed as liquid slag from the chamber 16, through a slag port located low on the cylindrical wall of the chamber close to the exit end 18.
  • the port is connected to a slag removal assembly 28, the details of which are not critical to the present invention.
  • the entire chamber 16 and the oxidizer inlet 12 are cooled by a fluid, such as water, passed through coolant inlets 30 on top of the cylinder and emerging from coolant exits at the bottom, some of which are shown at 32. Cooling of the combustion chamber 16 produces a solidified layer of slag on the chamber walls.
  • the solid layer of slag protects the chamber walls from erosion by liquid slag and by burning fuel particles, and also provides a relatively low conductivity insulating layer to reduce heat losses from the chamber.
  • the walls have a large number of upstanding pins affixed to them, as shown at 34 in Fig. 5.
  • the pins 34 are approximately 1/8 inch (3.2 mm) in diameter and 1/4 inch (6.4 mm) long, welded to the chamber walls at approximately 3/4 inch (19.2 mm) spacing.
  • the exit combustion stage 24 is used only in the event that it is required for matching the thermodynamic characteristics of the combustor with some downstream process, such as an MHD generator.
  • Fig. 2 shows in diagrammatic form the basic configuration of the slagging combustor.
  • Oxidizer gas is introduced tangentially into the combustion chamber 16 through a rectangular port located between the head end 20 and the exit end 18.
  • Fuel from the coal inlet 14 is dispersed along a generally conical spray having a substantial radial velocity component.
  • a half angle of approximately 60° with respect to the central axis of the cylinder 16 is used.
  • air from the oxidizer inlet 12 diverges into two separate paths, with respect to the axial component of flow of the oxidizer.
  • That portion of the oxidizer flowing back towards the head end 20 will encounter fuel from the coal inlet 14, and combustion will take place in the head end at a stoichiometric ratio of approximately half the overall ratio for the entire combustor. Fuel particles leaving the nozzle 14 will be substantially heated as they traverse the head end to meet the oxidizer gas near the chamber walls. Thus, if the overall stoichiometric ratio is 0.58, as in an MHD generator application, the stoichiometric ratio in the first combustion phase in the head end will be approximately 0.29. For this MHD application, additional oxidizer is added in the inlet to the MHD generator (not shown).
  • This rotational or cyclonic flow is important in that it provides a relatively long path over which burning of the fuel particles can take place and slag can be formed.
  • the swirling action enhances fuel and oxidizer mixing, and directs entrained material outward to the wall surfaces.
  • An annular baffle 40 prevents, for all practical purposes, any flow of slag beyond the exit end 18 of the slagging combustor.
  • Liquified slag principally from the head end 20, flows towards the slag tap 28 under the effects of graviational force and shear force between the slag and the adjacent moving combustion gases.
  • an additive material may be injected axially with the coal fuel, as indicated at 41 in Fig. 2, to increase the electrical conductivity of the resultant exiting gases or to otherwise modify the exhaust gas species.
  • Flow of the additive material has no significance in the present invention, however, except to the extent that it may be injected with sufficient velocity to avoid being captured in outflowing slag and to react with the hot exhaust gases.
  • Fig. 3 shows in sectional form a typical pintle nozzle structure.
  • the pintle 14 is cylindrical in shape and has a number of annular elements defining an axial passage 42 for the additive material, two concentric annular passages 43 and 44 joined in fluid communication at the end of the pintle, as shown at 45, to provide a cooling fluid path, and a surrounding annular fuel passage 46.
  • the annular fuel passage 46 terminates in conical exit port 48 extending in a continuous circle around the periphery of the pintle. Coal is ejected in a conical sheet from the exit port 48.
  • An additional annular cooling passage 49 is provided between the fuel passage 46 and the outside surface of the pintle.
  • Figs. 5-11 the invention may be used in a variety of embodiments, depending on the needs of the associated downstream application.
  • Fig. 5 there is shown a basic configuration utilizing the principles of the invention. Included are the coal pintle nozzle for injection of coal 14, a tangential inlet 12, slag tap 28, and an exit shown at 22a.
  • the coal could be alternatively injected by means of peripheral fuel inlet ports, such as those shown at 60 in Figs. 10 and 11.
  • the exit 22a is a volute exit shown in more detail in Fig. 5a.
  • the radius of the exit assembly increases from a minimum value to a maximum value, and an exit duct merges tangentially with the assembly at its point of maximum radius.
  • This is to be distinguished from the symmetrical exit (Fig. 6a), wherein an exit duct merges with a cylindrical exit assembly symmetrically, i.e., along a radius.
  • the object is to provide a uniform, non-swirling flow in the exit duct.
  • Figs. 6 and 6a differs from that of Fig. 5 in two respects.
  • a simpler symmetrical exit 22b is shown.
  • the exit 22b is located much closer to the inlet, i.e., the overall length of the slagging stage is reduced. This reduction is made possible because the second phase of combustion, in the exit end 18 of the chamber 16, takes a relatively short time, since it involves only gaseous components at a high temperature, the solid fuel having been practically completely combusted in the head end.
  • the more compact design of the Fig. 6 embodiment results in a further reduced heat loss and increased efficiency, while still maintaining good slag recovery.
  • Figs. 7 and 7a The embodiment shown in Figs. 7 and 7a is similar to that shown in Fig. 6, except that the exit end combustion phase takes place in an even smaller volume, since the oxidizer inlet, referred to as 12c, is moved much closer to the exit end 18 of the chamber 16, as a consequence of locating the slag tap 28c at the head end.
  • the coal injector has been accordingly lengthened and effectively moved towards the exit end with the inlet 12c.
  • the head end volume is correspondingly increased by relocation of the slag tap, and, as in all of the embodiments shown, most of the slag removal function is taking place in the first phase of combustion, at the head end. In this manner, heat loss through the slag tap 28c is reduced, because of the lower temperature in the head end region.
  • Placement of the slag tap 28c at the head end 20 also results in a higher slag removal efficiency, since there should be reduced slag volatilization because of the lower temperature of the head end.
  • the slag deposited on the head-end walls should be more easily convected toward the slag tap by the axial component of the inlet flow entering the head end 20.
  • Figs. 8 and 8a represents a further refinement of the embodiment shown in Fig. 7.
  • the tangential oxidizer gas inlet has been replaced by a volute inlet 12d, usually referred to as the recessed volute type.
  • the same volume of oxidizer gas can be introduced through the volute inlet as through the tangential inlet, but with an effective reduction in axial length of the inlet, since the volute inlet duct can be larger, measured in a radial direction, than a tangential inlet to a cylinder of the same size.
  • This shorter axial length can reduce heat losses from the combustor, and thereby increase efficiency.
  • the recessed volute 12d shown in more detail in Fig.
  • Fig. 10 shows a vertically oriented combustion chamber 16 having a recessed volute inlet 12f, a symmetrical outlet 22f, coal injectors 60 disposed peripherally about the chamber 16 at a location slightly towards the head end 20f from the inlet 12f, and a slag tap 28f located in an axial orientation in the head end.
  • the principle of operation is the same as that of the basic configurations already described.
  • Coal is injected into the portion of the inlet flow proceeding towards the head end 20f of the chamber 16, and a first phase of combustion occurs at the head end at a relatively low stoichiometric ratio.
  • a second stage of combustion can then occur in the exit end of the combustor before the products of combustion exit through the symmetrical exit 22f.
  • any of the aforedescribed embodiments may be modified for operation as gas generators by including means for diverting the entire oxidizer gas flow towards the head end 20 of the combustor.
  • the vertically oriented embodiment of Fig. 10 is shown as having a head end 20g and a cylindrical baffle 62 disposed in the oxidizer inlet 12g to act as a flow diverter, ensuring that the oxidizer flow has an axial component directed only toward the head end, as shown by the arrows 64.
  • the inlet flow is, of course, adjusted to provide a desired stoichiometric ratio for generating combustible gas.
  • the present invention represents a significant advance in the field of coal combustors.
  • the invention provides a slagging combustor operating with desirable slag removal characteristics at a relatively low stoichiometric ratio, and therefore providing for reduced heat losses and increased efficiency.
  • the combustor is easily adaptable to match the requirements of various downstream processes, such as MHD generators or processes requiring synthetic fuel gas.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Feeding And Controlling Fuel (AREA)

Claims (21)

1. Appareil de combustion de combustible, comprenant une chambre de combustion (16) ayant une extrémité de tête (20) et une extrémité opposée de sortie (18), un dispositif (14) d'entrée de combustible destiné à la transmission d'un combustible particulaire solide dans la chambre à l'extrémité de tête (20), un dispositif (12) d'entrée d'oxydant destiné à transmettre un oxydant dan la chambre en direction sensiblement tangentielle afin qu'il forme un courant rotatif à vitesse élevée à l'intérieur de la chambre, une sortie (22) destinée à l'évacuation de produits de combustion à l'extrémité de sortie de la chambre, un déflecteur (40) de coulée de laitier placé entre les extrémités et un piège (28) à laitier destiné à l'extraction du laitier de la chambre, l'appareil de combustion étant caractérisé en ce que le dispositif (12) d'entrée d'oxydant est placé entre les extrémités et est destiné à faire circuler une partie de l'oxydant vers l'extrémité de tête (20) de la chambre et à faire circuler le reste de l'oxydant introduit vers l'extrémité de sortie (18) de la chambre, dans des proportions telles que le combustible et la partie d'oxydant réagissent dans l'extrémité de tête (20) de la chambre dans une première phase de combustion, avec un rapport stoechiométrique relativement faible et une température basse correspondante, permettant une liquéfaction du laitier formé par le combustible introduit avec une vaporisation minimale, le courant rotatif provoquant la projection du laitier liquide sous l'action de la force centrifuge sur la paroi de la chambre afin qu'il soit retiré par le piège à laitier, le reste du gaz oxydant introduit réagissant avec les produits de combustion de la première phase de combustion près de l'extrémité de sortie de la chambre (18) dans une seconde phase de combustion, afin qu'un rapport stoechiométrique global notablement supérieur à celui de la première phase soit obtenu.
2. Appareil de combustion d'un combustible selon la revendication 1, caractérisé en outre en ce que le dispositif (12) d'entrée d'oxydant est disposé entre les extrémités de la chambre d'une manière telle que la circulation de ladite partie du gaz oxydant est exécutée de manière générale à contre-courant par rapport au courant de combustible et des produits de combustion de la première phase dans la chambre.
3. Appareil de combustion d'un combustible selon l'une des revendications 1 et 2, caractérisé en outre en ce que le dispositif (12) d'entrée d'oxydant est destiné à diriger la plus grande partie du gaz oxydant introduit vers l'extrémité de tête (20).
4. Appareil de combustion d'une combustible selon l'une des revendications 1 et 2, caractérisé en outre en ce que le dispositif (12) d'entrée d'oxydant est destiné à diriger la moitié environ du courant introduit de gaz oxydant vers l'extrémité de tête (20) afin qu'elle donne un rapport stoechiométrique, dans la première phase de combustion, approximativement égal à la moitié du rapport global de l'appareil de combustion.
5. Appareil de combustion d'un combustible selon l'une quelconque des revendications précédentes, caractérisé en outre en ce que le dispositif (12) d'entrée d'oxydant comporte une entrée d'oxydant du type à spirale en retrait.
6. Appareil de combustion d'un combustible selon l'une quelconque des revendications précédentes, caractérisé en outre en ce que la sortie (22) débouche axialement par l'extrémité de sortie de la chambre.
7. Appareil de combustion d'un combustible selon l'une quelconque des revendications 1 à 5, caractérisé en outre en ce que la sortie (22) comporte une sortie spiralée débouchant tangentiellement à l'extrémité de sortie de la chambre.
8. Appareil de combustion d'un combustible selon l'une quelconque des revendications 1 à 5, caractérisé en outre en ce que la sortie (22) débouche latéralement par rapport à l'extrémité de sortie de la chambre.
9. Appareil de combustion d'un combustible selon l'une quelconque des revendications 2 à 8, caractérisé en outre en ce que l'entrée (12) d'oxydant est placée plus près de l'extrémité de tête (20) que du déflecteur (40), et en ce que le piège (28) à laitier est placé près du déflecteur (40).
10. Appareil de combustion d'un combustible selon l'une quelconque des revendications 2 à 8, caractérisé en outre en ce que l'entrée (12) d'oxydant est placée à peu près à mi-distance entre l'extrémité de tête (20) et le déflecteur (40), et en ce que le piège (28) à laitier est disposé près du déflecteur (40).
11. Appareil de combustion d'un combustible selon l'une quelconque des revendications 2 à 8, caractérisé en outre en ce que l'entrée (12) d'oxydant est placée plus près du déflecteur (40) que de l'extrémité (20) de tête de la chambre, et en ce que le piège (28) à laitier est placé près de l'extrémité de tête (20) de la chambre.
12. Appareil de combustion d'un combustible selon l'une quelconque des revendications précédentes, caractérisé en outre par une seconde chambre de combustion ayant une extrémité de sortie qui débouche dans l'extrémité de sortie de la première chambre de combustion et une extrémité opposée de tête, des seconds dispositifs d'entrée de combustible et d'oxydant destinés à transmettre un combustible carboné particulaire solide à l'extrémité de tête de la seconde chambre et à transmettre un gaz oxydant dans cette dernière chambre, afin qu'il forme un courant à grande vitesse dans la chambre, une sortie destinée à l'évacuation des produits de combustion depuis l'extrémité de sortie de la seconde chambre, un piège à laitier destiné à l'extraction du laitier de la seconde chambre, et le dispositif d'entrée dans la seconde chambre assure la circulation d'une partie au moins du gaz oxydant introduit vers l'extrémité de tête de la seconde chambre et la circulation du reste éventuel du gaz oxydant introduit vers l'extrémité de sortie de la seconde chambre, avec des proportions telles que la partie de gaz oxydant et le combustible introduit réagissent dans l'extrémité de tête de la seconde chambre dans une première phase de combustion, avec un rapport stoechiométrique relativement faible et une faible température correspondante, permettant la liquéfaction du laitier qui peut être formé par le combustible introduit, avec une vaporisation minimale, le laitier liquide étant projeté par la force centrifuge sur la paroi de la chambre afin qu'il soit retiré par l'intermédiaire du piège à laitier, le reste du gaz oxydant introduit réagissant dans l'extrémité de sortie de la seconde chambre avec les produits de combustion de la première phase de combustion, dans une seconde phase de combustion, afin que la seconde chambre de combustion présente un rapport stoechiométrique global qui est nettement supérieur au rapport stoechiométrique de la première phase, dans la seconde chambre.
13. Appareil de combustion d'un combustible selon l'une quelconque des revendications précédentes, caractérisé en outre en ce que la chambre de combustion est disposée verticalement, son extrémité de sortie étant la plus haute et son extrémité de tête la plus basse.
14. Appareil de combustion d'un combustible selon l'une quelconque des revendications précédentes, caractérisé en outre en ce que le dispositif d'entrée de combustible comporte plusieurs orifices d'entrée de combustible espacés circon- férentiellement autour de l'extrémité de tête de la chambre de combustion.
15. Appareil de combustion de combustible selon l'une quelconque des revendications précédentes, caractérisé en outre en ce que le piège à laitier est placé au centre à la partie inférieure de la chambre de combustion.
16. Appareil de combustion de combustible selon l'une quelconque des revendications précédentes, caractérisé en outre par un dispositif fixé aux parois de la chambre de combustion et destiné à augmenter l'adhérence du laitier solidifié aux parois.
17. Appareil de combustion d'un combustible selon l'une quelconque des revendications précédentes, caractérisé en outre en ce que le dispositif d'entrée d'oxydant est destiné à donner un rapport stoechiométrique global qui est suffisamment élevé pour qu'il assure une gazéification pratiquement totale du combustible, les températures de combustion étant suffisamment faibles qu'elles évitent la vaporisation du laitier liquide.
18. Procédé de combustion comprenant la transmission d'un combustible carboné particulaire solide et d'un oxydant dans une chambre réactionnelle ayant une extrémité de tête et une extrémité opposée de sortie, d'une manière telle qu'un courant rotatif à grande vitesse soit formé dans la chambre, l'évacuation des produits de combustion à l'extrémité de sortie de la chambre, et l'extraction du laitier hors de la chambre, le procédé étant caractérisé par les étapes de transmission du combustible afin qu'il pénètre à l'extrémité de tête de la chambre, deux transmissions de l'oxydant à une entrée comprise entre les extrémités et deux distributions de l'oxydant de manière qu'une première partie de l'oxydant entrant s'écoule vers l'extrémité de tête de la chambre et que le reste de l'oxydant s'écoule vers l'extrémité de sortie de la chambre dans des proportions telles que la première partie réagit dans l'extrémité de tête de la chambre avec le combustible introduit, dans une première phase de combustion, avec un rapport stoechiométrique relativement faible et un faible température correspondante, si bien que le laitier qui peut être formé par le combustible se liquéfie avec une vaporisation minimale et le laitier liquide est projété par la force centrifuge sur la paroi de la chambre afin qu'il soit retiré de la chambre, et le reste de l'oxydant introduit réagit avec les produits de combustion de la première phase, pendant une seconde phase de combustion, à proximité de l'extrémité de sortie de la chambre, afin qu'un rapport stoechiométrique global nettement supérieur à celui de la première phase soit obtenu.
19. Procédé selon la revendication 18, caractérisé en outre en ce que l'oxydant est injecté tangentiellement dans la chambre de combustion entre l'extrémité de tête et l'extrémité de sortie, d'une manière telle que le courant d'oxydant introduit se divise en formant la première partie d'oxydant qui s'écoule vers l'extrémité de tête et la partie restante qui s'écoule vers l'extrémité de sortie.
20. Procédé selon l'une des revendications 18 et 19, caractérisé en outre en ce que l'oxydant transmis est tel que la première phase de combustion est réalisée avec un rapport stoechiométrique à peu près égal à la moitié du rapport global de l'appareil de combustion.
21. Procédé selon l'une des revendications 18 et 19, caractérisé en outre en ce que la totalité pratiquement de l'oxydant introduit est dirigée vers l'extrémité de tête de la chambre.
EP82901239A 1981-03-17 1982-03-11 Bruleur Expired EP0073830B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24455381A 1981-03-17 1981-03-17
US244553 1981-03-17

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EP0073830A1 EP0073830A1 (fr) 1983-03-16
EP0073830A4 EP0073830A4 (fr) 1985-10-14
EP0073830B1 true EP0073830B1 (fr) 1988-01-13

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EP (1) EP0073830B1 (fr)
JP (1) JPS58500420A (fr)
AU (1) AU551776B2 (fr)
CA (1) CA1181998A (fr)
DE (1) DE3237454C2 (fr)
DK (1) DK509582A (fr)
IL (1) IL65224A0 (fr)
IT (1) IT1155634B (fr)
MX (1) MX160386A (fr)
NL (1) NL8220118A (fr)
PL (1) PL235462A1 (fr)
WO (1) WO1982003261A1 (fr)
ZA (1) ZA821798B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
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DE3128903C2 (de) * 1981-07-22 1983-09-08 L. & C. Steinmüller GmbH, 5270 Gummersbach "Verfahren zum Eintragen von Additiv in einen Reaktionsgasstrom"
EP0111874B1 (fr) * 1982-12-15 1987-04-22 Gewerkschaft Sophia-Jacoba Steinkohlenbergwerk Installation pour brûler la poussière de charbon
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KR950011331B1 (ko) * 1986-10-27 1995-09-30 티 알 더블유 인코포레이티드 슬래깅 연소 시스템
DE19517529A1 (de) * 1995-05-12 1996-11-14 Petersen Hugo Verfahrenstech Brenner

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NL8220118A (nl) 1983-02-01
DE3237454C2 (de) 1995-09-14
MX160386A (es) 1990-02-14
CA1181998A (fr) 1985-02-05
JPH0259362B2 (fr) 1990-12-12
IL65224A0 (en) 1982-05-31
AU551776B2 (en) 1986-05-08
JPS58500420A (ja) 1983-03-17
DK509582A (da) 1982-11-16
EP0073830A1 (fr) 1983-03-16
ZA821798B (en) 1983-04-27
PL235462A1 (fr) 1982-11-08
EP0073830A4 (fr) 1985-10-14
IT8267327A0 (it) 1982-03-16
AU8331382A (en) 1982-10-06
DE3237454T1 (de) 1983-07-28
IT1155634B (it) 1987-01-28
WO1982003261A1 (fr) 1982-09-30

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