EP0585441A1 - Bruleur pauvre en oxyde d'azote. - Google Patents

Bruleur pauvre en oxyde d'azote.

Info

Publication number
EP0585441A1
EP0585441A1 EP93906562A EP93906562A EP0585441A1 EP 0585441 A1 EP0585441 A1 EP 0585441A1 EP 93906562 A EP93906562 A EP 93906562A EP 93906562 A EP93906562 A EP 93906562A EP 0585441 A1 EP0585441 A1 EP 0585441A1
Authority
EP
European Patent Office
Prior art keywords
recirculation
burner according
tube
burner
slide
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
EP93906562A
Other languages
German (de)
English (en)
Other versions
EP0585441B1 (fr
Inventor
Winfried Buschulte
Erich Adis
Manfred Bader
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.)
Deutsches Zentrum fuer Luft und Raumfahrt eV
Original Assignee
Deutsche Forschungs und Versuchsanstalt fuer Luft und Raumfahrt eV DFVLR
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Deutsche Forschungs und Versuchsanstalt fuer Luft und Raumfahrt eV DFVLR filed Critical Deutsche Forschungs und Versuchsanstalt fuer Luft und Raumfahrt eV DFVLR
Publication of EP0585441A1 publication Critical patent/EP0585441A1/fr
Application granted granted Critical
Publication of EP0585441B1 publication Critical patent/EP0585441B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • 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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
    • 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 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/50—Control of recirculation rate

Definitions

  • the invention relates to a burner for generating hot gas with a burner tube, comprising a support tube and a flame tube adjoining it, with a nozzle arranged in the support tube, from which a fuel jet emerges, with an orifice separating a prechamber and a combustion chamber in the burner tube has a central passage penetrated by the fuel jet, with recirculation openings arranged in the flame tube and permitting external recirculation of cooled flue gas, and with an element for suppressing the external recirculation during a starting phase of the burner.
  • Such burners are known from DE-PS 39 06 854.
  • the disadvantage of such burners is that due to the heating of the elements provided for the suppression of the external recirculation during the starting phase, their function is impaired.
  • the invention is therefore based on the object of improving a burner of the generic type in such a way that reliable suppression of the external recirculation is possible during the starting phase.
  • suppression of the external recirculation during the starting phase is to be understood as a suppression of the external recirculation given in warm burners by more than 50%, preferably more than 70% and in special cases by more than 85%.
  • a complete suppression of external recirculation represents an extreme case of the teaching according to the invention.
  • a particularly advantageous variant of the solution according to the invention provides that the element for suppressing the external recirculation is an element which shuts off a recirculation gas flow within the burner tube in a slide-like manner. With such a slide-like element, the recirculation gas flow in the burner tube can be suppressed in a structurally simple manner and thus also reliably.
  • a structurally particularly simple solution provides that the slide-like element is a slide having an annular jacket and movable in the axial direction. This is the structurally simplest and therefore the cheapest to implement.
  • the slide has a sealing surface that is cylindrical with respect to the axis. With this cylindrical sealing surface, the slide can be arranged in a simple manner in the burner tube.
  • a somewhat more complex, but functionally improved solution provides that the slide-like element has an annular sealing surface with respect to the axis, which is in a substantially perpendicular to the axis Level lies.
  • This construction of the sealing surface problems of different heating of the individual parts, which occur with a cylindrical sealing surface, can be avoided, since the sealing surface is perpendicular to the direction of displacement of the slide and thus all different tolerances resulting from the displacement of the slide-like element are compensated.
  • the tightness of a sealing surface arranged in this way is considerably greater and can be achieved with extremely simple means.
  • this solution offers the advantage that an intermediate space, for example between the flame tube and the slide-like element, can be kept sufficiently large, so that there is no risk that the slide-like element and the adjusting mechanism provided for this purpose will differ due to different heating of the Clamp parts.
  • the sealing surface perpendicular to the axis prevents any unburned oil from dripping out of the burner tube, which could lead to pollutant emissions.
  • the slide-like element is part of a cladding tube running inside the support tube.
  • the slide-like element is preferably a collar of the cladding tube protruding beyond the diaphragm in the direction of the combustion chamber.
  • the collar of the cladding tube can be sealingly applied to an annular bead in the flame tube.
  • the collar is preferably provided with an annular flange and the annular bead is also provided with a sealing element or is designed as such.
  • the slide-like element is an end section of the cladding tube which is closed off by the cover.
  • This section can expediently be placed against an annular bead in the flame tube.
  • the cladding tube carries the nozzle assembly, for example over a tripod.
  • a particularly favorable and preferred solution provides that the cladding tube as a whole can be displaced in the axial direction in the burner tube with the nozzle assembly and the diaphragm.
  • the slide-like element is a shielding ring dividing a recirculation space into an inner and an outer recirculation space.
  • the slide-like element is not only there to suppress the recirculation gas flow to the outer recirculation, but at the same time it separates the recirculation space into an inner and an outer recirculation space.
  • the shielding ring can be sealingly applied to the screen to suppress the external recirculation.
  • the shielding ring can be moved from a position at a distance from the diaphragm, in which it allows external recirculation, to a position in sealing contact with the diaphragm.
  • an annular sealing surface lying outside a projection of a mixing tube onto the panel is formed between the diaphragm and the shielding ring, that is to say that the sealing surface lies outside the mixing tube.
  • the mixing tube is not carried by the diaphragm as in the solutions described above, but if the shielding ring carries the mixing tube, so that the movement of the shielding ring simultaneously results in a movement of the mixing tube he follows. In this way, the mixing ratios created by the mixing tube in the mixing space can be changed in a simple manner simultaneously with the movement of the shielding ring.
  • the displaceability of the shielding ring can be implemented in a structurally particularly simple manner if the shielding ring can be displaced through the struts passing through the diaphragm.
  • This solution is particularly advantageous in the context of the present invention, since it also ensures an adjustment mechanism for the shielding ring which lies outside the hot parts of the burner.
  • the actuating mechanism is rather cooled by the cold combustion air flowing into the combustion chamber.
  • the struts In order to be able to keep and guide the struts and thus also the shielding ring carried by them in a simple manner in the axial direction, provision is preferably made for the struts to be displaceable in the axial direction on the nozzle block arranged in a non-displaceable manner in the support tube are led.
  • the nozzle assembly thus simultaneously forms a guide for the alignment of the struts in the support tube.
  • the external recirculation was suppressed by the slide-like element, ie the recirculation gas flow was shut off in the manner of a slide.
  • an alternative and preferred embodiment of the solution according to the invention provides that the element for suppressing the external recirculation suppresses a suction of cooled flue gas via the recirculation openings by opening a fresh air supply.
  • the recirculation gas flow is not switched off in a slide-like manner, but that the intake of cooled flue gas is suppressed by supplying fresh air to the recirculation space by means provided for this purpose, so that the cooled flue gas drawn in when the burner is in the warm operating state is replaced by the supplied fresh air and thus the suction of the cooled flue gas is suppressed as part of the external recirculation.
  • this is achieved in that the element for suppressing the external recirculation opens up a fresh air supply into the recirculation space, ie that fresh air is directly fed into the recirculation space in which a negative pressure is present. so that to a lesser extent cooled flue gas is sucked into the recirculation room.
  • the element for suppressing the recirculation can be used to supply fresh air from the antechamber into the recirculation space.
  • the element for suppressing the external recirculation can be used to produce a fresh air supply into an outer recirculation space which is separated from an inner recirculation space.
  • the recirculation space is thus also advantageously separated, in particular by a shielding element, into an outer and an inner recirculation space, so that the outer recirculation can be selectively and specifically suppressed by fresh air entering this outer recirculation space is feasible.
  • the ventilation openings in the panel can be closed by a closure element.
  • the closure element can be designed in a wide variety of ways, for example as a slide or the like. It is structurally favorable if the closure elements are closure plugs which can be moved in the axial direction.
  • closure elements are arranged in the antechamber, since they are then exposed to the cold fresh air flow and can be cooled by it.
  • closure elements In order to achieve a defined guidance of the closure elements, it is preferably provided that they are displaceably guided in the axial direction on the nozzle block held stationary in the support tube, so that a defined orientation of the closure elements can be achieved in a simple manner.
  • another preferred exemplary embodiment of the solution according to the invention provides that the fresh air supply takes place in the vicinity of the recirculation opening. This can be realized in a constructively advantageous manner if the fresh air supply can be produced in an annular space following the recirculation opening.
  • the fresh air supply can be controlled by a closure element arranged in the prechamber.
  • the supply of fresh air can be implemented in a structurally advantageous manner if the closure element can be used to release or close fresh air from the antechamber leading to the intermediate space.
  • a solution is particularly simple in which the ventilation openings can be closed with a sealing surface that is cylindrical with respect to the axis.
  • the extent to which the suppression is maintained during the starting phase was not discussed.
  • the burner has an internal recirculation, since optimal combustion values can be achieved with the internal recirculation.
  • an embodiment of the solution according to the invention has proven to be optimal, in which a stationary alignment of the nozzles, orifice and mixing tube in combination with predetermined internal and external recirculations is defined, so that no misalignment of the burner properties is possible and only in the starting phase the suppression of the external recirculation according to the invention and the subsequent release in the warm operating state is possible.
  • FIG. 1 shows a longitudinal section through a first embodiment of a burner according to the invention
  • FIG. 2 shows a longitudinal section through a second exemplary embodiment of a burner according to the invention
  • FIG. 3 shows a longitudinal section through a third exemplary embodiment of a burner according to the invention
  • FIG. 4 shows a longitudinal section through a fourth exemplary embodiment of a burner according to the invention
  • FIG. 5 shows a longitudinal section through a fifth exemplary embodiment of a burner according to the invention.
  • FIG. 6 shows a longitudinal section through a sixth exemplary embodiment of a burner according to the invention.
  • the invention relates to a wide variety of oil or gas burners and is discussed below using the example of a so-called blue burner, ie a burner in which oil is completely burned with a blue flame.
  • the invention is not limited to such blue burners.
  • the effects according to the invention can also be achieved with preheating burners and yellow burners.
  • a first exemplary embodiment of a burner according to the invention shown in FIG. 1, comprises a burner tube, designated as a whole by 10, which has a support tube 12 which is mounted on a burner frame, not shown in the drawing.
  • This support tube 12 carries a flame tube 14 also encompassed by the burner tube 10, the support tube 12 and the flame tube 14 being connected to one another, for example, by a fold.
  • a prechamber designated as a whole by 16 is arranged in the support tube 12 and extends as far as a diaphragm 18, which forms a partition between the prechamber 16 and a combustion chamber 20, which is essentially arranged in the flame tube 14.
  • the aperture 18 is held centered in the support tube 12 and arranged at the transition from the support tube 12 into the flame tube 14, the aperture 18 with an outer ring flange 22 being supported on the one hand on an inside 17 of the support tube 12 and on the other hand facing the flame tube 14 Bears against an insulating ring 24, which ensures thermal insulation of the insulation against false air between the flame tube 14 and the ring flange 22.
  • a nozzle assembly designated as a whole by 26, with a nozzle 28, this nozzle 28 preferably being aligned coaxially with a central axis 30 of the burner tube 10.
  • the nozzle 28 has an outlet 32 which is arranged in the direction of the central axis 30 at a short distance upstream of a surface 34 of the orifice 18 facing the prechamber 16.
  • a fuel jet 36 emerges from this outlet 32, which passes through a central passage 38 of the orifice 18 and spreads in the combustion chamber 20 within the flame tube 14 downstream of the orifice 18.
  • the nozzle assembly 26 is preferably still held with a base 38 on the screen 18 and this is preferably guided in the support tube 12.
  • mixing tube is adjacent to the aperture 18, which is provided in connection with the aperture 18 with peripheral apertures 42, through which recirculation of flue gas of 'an inside of the flame tube 14 and outside of the mixing tube 40 recirculation space 44 into a mixing space 46 located inside the mixing tube 40, which is also penetrated by the fuel jet 36.
  • Combustion air is also fed to the mixing chamber 46 from the pre-chamber 16 via openings 48 in the aperture 18 which are arranged around the passage 38 and which are preferably molded on their side facing the pre-chamber 16 and thus to reduce the noise of the burner contribute.
  • recirculation space 44 While the burner according to the invention is running, on the one hand there is an internal recirculation 50 which starts from an end 52 of the mixing tube facing away from the orifice 18 and flows back to the circumferential openings 42 as well as an external recirculation 54 in which cooled flue gases rise in the boiler space flow around the outside of the flame tube 14 and pass through recirculation openings 56, which are preferably arranged in the periphery thereof near the end of the flame tube 14 facing the support tube.
  • This external recirculation 54 enables the combustion temperature to be reduced and thus the nitrogen oxide content of the burner to be reduced.
  • a slide 62 which bears against the inside 58 of the cylinder tube with a cylindrical outside 60 is arranged in the interior of the flame tube 14 and is designed as a cylindrical ring and can thus be displaced in the direction of the central axis 30 within the flame tube 14 that either the recirculation openings 56 are closed or released.
  • the ring-shaped slide 62 is only guided through its outer side 60 on the inner side 58 of the flame tube and to Closing the recirculation openings is displaced in the direction of the diaphragm 18, so that its jacket 64 stands on the inside 58 of the flame tube 14 in front of the recirculation openings 56 and closes them.
  • the slide 62 is displaced away from the diaphragm 18, so that the jacket 64 releases the recirculation openings.
  • a linkage 66 is provided as the control means for actuating the slide 62, which is passed through an opening 68 of the diaphragm 18 and is guided inside the support tube 12 through the prechamber 16, in particular an area of the prechamber 16 cooled by the combustion air flowing to the combustion chamber 20 and runs to an actuator 70 which is, for example, a hydraulic or pneumatic cylinder or another linear displacement unit.
  • the slide 62 with its jacket 64 can thus be moved in front of the recirculation openings 56 and thus suppresses the external recirculation 54 into the mixing space 46, so that the burner burns stably in the start phase.
  • the slide 62 is displaced in the direction away from the diaphragm 18 via the actuating member 70 and the linkage 66, namely until the jacket 64 clears the recirculation openings 56.
  • the burner burns again with external recirculation and thus reduced nitrogen oxide content.
  • FIG. 2 is provided with the same reference numerals insofar as it has parts identical to the first exemplary embodiment, so that reference is made in full to the statements relating to the first exemplary embodiment.
  • the diaphragm 18 is held on a cladding tube 72 which runs coaxially to the supporting tube 12 within the latter.
  • the cladding tube 72 has a front section 74 which is closed on the jacket side and which, on the one hand, supports the panel 18, but extends beyond it and forms a collar 76a which projects beyond the panel 18 in the direction of the combustion chamber 20 and on its front side, the panel 18 facing away from an annular flange 78 is formed to catch dripping oil during the starting process and then to evaporate there.
  • the screen 18 carries the mixing tube 40, which is also designed identically to the first exemplary embodiment.
  • the recirculation openings 56 are provided in direct connection to the support tube 12 in the flame tube 14.
  • the collar 76a extends from the diaphragm 18 into the combustion chamber 20 to such an extent that the outer surface 80 thereof can be positioned within the flame tube 14 in front of the recirculation openings 56.
  • the flame tube 14 is provided with an annular bead 76b projecting on the inside 58 thereof, in which a sealing ring 84 is inserted on the side facing the panel 18, the annular bead 76b with the sealing ring 84 on a side opposite the panel the recirculation openings 56 is arranged.
  • the sealing ring 84 has such a radius that the ring flange 78 of the collar 76a can be placed against it and thus a sealing surface lying in a plane 86 perpendicular to the central axis 30 is created between the sealing ring 84 and the ring flange 78, which is also on the faceplate 18 opposite side of the recirculation openings 56.
  • the outer recirculation 54 can thus be completely suppressed by applying the ring flange 78 to the sealing ring 84. According to the invention, however, it is also sufficient to suppress the outer recirculation 54 by not providing a complete seal between the collar 76a and the annular bead 76b, so that the sealing ring 84 is also not absolutely necessary.
  • the annular flange 78 lifts off the sealing ring 84 and can be retracted to the extent that the annular flange 78 on the side of the orifice 18 facing the orifice Recirculation openings 56 and thus the recirculation openings 56 again allow the external recirculation 54 into the recirculation space 44 " .
  • the outer surface 80 preferably lies neither on the inner side 58 of the flame tube 14 nor on an inner side of the support tube 12, but runs at a distance from these. Sealing against an inner side 17 of the support tube 12 takes place by means of an annular seal 90 lying between this and the outer surface 80, which is preferably fastened on the closed section 74 of the cladding tube 72.
  • a seal is thus made once in the plane 86 between the ring flange 78 and the sealing ring 84 and once between the outer surface 80 and the inside 88 of the support tube 12 by means of the ring seal 90.
  • the cladding tube 72 also extends further into the pre-chamber 16, but is perforated in this area through a large number of openings 92, so that the combustion air flowing into the combustion chamber 20 can pass through the cladding tube.
  • the nozzle assembly 26 is arranged, which is supported on the cladding tube 72 via holding arms 94 forming a tripod.
  • the actuating member 70 is arranged on a side opposite the orifice 18 on the burner frame 94, which is, for example, a hydraulic cylinder which can be actuated by the pressure of the oil supplied to the nozzle 28, this pressure using a valve 98 for the hydraulic cylinder 70 can be switched on or off.
  • a piston rod 100a of the hydraulic cylinder 70 engages the nozzle assembly 26 via a holder 100b and displaces it with the cladding tube 72 in the direction of the central axis 30 either in the direction of the combustion chamber 20 or in the opposite direction, preferably a spring 104 is provided, which acts on the nozzle assembly 26 in the direction of the combustion chamber 20, so that, without the action of the actuating element 70, the cladding tube 72 is also displaced in the direction of the combustion chamber and rests with its ring flange 78 on the sealing ring 84 within the flame tube.
  • the nozzle stock is pulled back in the direction away from the combustion chamber 20 and thus also the already described opening of the recirculation openings 56 after the starting phase.
  • the advantage of the second exemplary embodiment can be seen in the fact that firstly there is a seal within the flame tube 14 and secondly by a movement in the direction of the central axis 30, so that the plane 86 in which the seal takes place is perpendicular to the central axis 30 stands.
  • the recirculation openings 56 can be dimensioned such that their slot width is smaller, and on the other hand their circumferential extent is larger, so that the cooled flue gases are distributed more evenly from the external recirculation 54 and, moreover, only a small adjustment path for the displacement of the cladding tube 72 to suppress the external recirculation 54 is required.
  • all the elements for suppressing recirculation that is to say the collar 76a with the annular flange 78 and the annular bead 76b with the sealing ring 84, and also the ring seal 90 are located within the combustion chamber 10, and in the same way the control means 100a, 100b are for the actuation of the elements 76 for suppressing the external recirculation 54 is arranged inside the burner tube 10, specifically in the support tube 12, in particular in an area which is flowed through by cold combustion air for the combustion chamber 20.
  • a third exemplary embodiment shown in FIG. 3 is constructed similarly to the second exemplary embodiment.
  • the third exemplary embodiment differs from the second exemplary embodiment in that the cladding tube 72 is not provided with a collar 76a, but extends to the level of an end face of the diaphragm 18, but not beyond it.
  • An end section 76a 'of the cladding tube 72 takes over the function of the collar 76a and, together with the cladding tube 72, is so far in the direction of the combustion chamber displaceable so that it can be positioned with its front surface 80 ′ within the flame tube 14 in front of the recirculation openings 76 in order to suppress the external recirculation 54.
  • the flame tube is provided, in the same way as in the second embodiment, with the annular bead 76b projecting on the inside 58, which, however, does not have a sealing ring 84 but only an end-side contact surface 83 facing the end face 90 of the diaphragm, which is arranged downstream of the recirculation openings 56.
  • the contact surface 83 has such a radial extent that the end section 76a 'of the cladding tube 72 can be placed against it, in particular with the end face 19 of the diaphragm 18, so that an im between the end contact surface 83 and the end face 90 substantially tight seal can be reached with a sealing surface lying in plane 86 perpendicular to the central axis 30, the plane 86 being downstream of the recirculation openings 56 and additionally the ring seal 90 also ensuring a seal between the cladding tube 72 and the support tube 12 .
  • Suppression of the external recirculation 54 is sufficient in the third exemplary embodiment for the starting phase of the burner when the recirculation is suppressed substantially, that is to say more than 50% or in particular more than 70%, so that it is sufficient if the end section 76a 'with the end face 90 in is a small distance from the end face 83, which can be of the order of one millimeter.
  • the remaining gap still allows a small amount of recirculation, but does not lead to the disturbances in the starting phase mentioned at the beginning.
  • the hydraulic cylinder 70 initially displaces the cladding tube 72 with the end section 76a ′ in the direction of the annular bead 76b in the start phase in such a way that the external recirculation is suppressed, but then after the Starting the burner moves the end section 76a 'away from the ring bead 76b successively in several steps after defined periods of time, thus increasingly suppressing the suppression of the external recirculation 54 until the complete recirculation has ended after the start phase 54 is permitted through the recirculation openings 56.
  • Such actuation of the hydraulic cylinder 70 is preferably carried out by applying pressure to the hydraulic cylinder with the pressure of the fuel supplied to the nozzle 28 by means of the valve 98.
  • the burner tube 10 is likewise formed from the support tube 12 and the flame tube 14 and, in addition, the diaphragm 18 is held stationary in the center of the support tube 12, the ring flange 22 of which extends to the inside 17 of the support tube 12.
  • the aperture 18 rests with the annular flange 22 on the insulating ring 24 and is thus thermally insulated against false air from the flame tube 14 and the support tube 12 by this insulating ring 24.
  • the recirculation openings 56 are arranged in the flame tube 14.
  • the nozzle assembly 26 is connected to the cover 18 via the base 38.
  • the orifice 18 does not support the mixing tube 40, but the mixing tube 40 is in turn held by a shielding ring 110 which, starting from an end face 112 of the mixing tube 40 facing the orifice 18, extends in a radial direction ⁇ direction extends outward to the inside 58 of the flame tube, and forms an annular space 114 between itself and the inside 58, in which the recirculation openings 56 open regardless of the position of the shielding ring 110. Furthermore, the shielding ring 110 forms a surface 116 facing the orifice 18, which runs parallel to a surface 118 of the orifice 18 facing the combustion chamber 20.
  • surface 118 and surface 116 are perpendicular to plane 86 ' to the central axis 30.
  • the shielding ring 110 also closes with its outer edge 120 essentially tightly with the inside 58 and thus always separates the recirculation space 44, specifically into a recirculation space 44a, into which the inner recirculation 50 leads, and a recirculation space 44b, in which the outer recirculation 54 leads through the recirculation openings 56.
  • the outer recirculation space 54 thus feeds cooled flue gas to the mixing tube 40 via its end face 112 facing the orifice 18, while the inner recirculation space feeds hot flue gas to the mixing tube 40 via the peripheral openings 42.
  • the shielding ring 110 can now be displaced such that its surface 116 abuts the surface 118 of the screen 18 and thus separates the outer recirculation space 44b from the mixing space 46, so that the outer recirculation 54 is suppressed.
  • the shielding ring 110 can be displaced in the direction of the combustion chamber 20 so that a channel leading from the annular space 114 into the mixing space 46 is formed between the surface 118 and the surface 116 of the shielding ring 110, so that the external recirculation 54 can take place .
  • a linkage 122 is provided, each of which has openings 120 in the diaphragm struts 122a which start from a guide ring 122b guided on the nozzle assembly 26.
  • This guide ring is in turn connected to the actuator 70 via a linkage 122c.
  • the guide ring 122b which is slidably mounted on a cylinder surface 128 of the nozzle assembly 26, results in the surface 116 being guided parallel to the surface 118.
  • a shielding ring 110 is arranged in the fourth exemplary embodiment, but is fixed with the surface 116 at a constant distance from the surface 118 of the screen 18.
  • the shielding ring 110 thus separates the outer recirculation 54 from the inner recirculation 50 through the recirculation openings 56.
  • the shielding ring 110 thus acts as a separation between the outer recirculation 54 and the inner recirculation 50, but cannot be displaced in order to prevent the outer recirculation 54.
  • ventilation openings 130a are provided lying radially on the outside, which are located radially outside of a projection of the mixing tube 40 onto the orifice 18 with respect to the axis 30.
  • Ventilation openings 130a can be closed with closure elements 130b, the closure elements 130b in the simplest case being closure plugs which can be inserted into the ventilation openings 130a parallel to the direction of the axis 30 in order to close them.
  • closure plugs sit on pins 132a, which in turn are guided on a cylinder surface 134 with a guide ring 132b on the nozzle assembly 26 in the direction of the axis 30.
  • the guide ring 132b is in turn displaceable by a linkage 132c which is connected to the actuator 70.
  • the ventilation opening 130a and the sealing plugs 130b are thus largely immune to the high temperatures in the shielding ring 110 shielded the combustion chamber 20, so that in the area of the same, in particular when the ventilation openings 130a are closed by means of the sealing plugs 130b, no problems arise due to uneven heating.
  • the ventilation openings 130a are opened so that the external recirculation 54 is suppressed. Thereafter, the ventilation openings 130a are closed by means of the sealing plugs 130b by moving the linkage 132c with the guide ring 132b and the pins 132a in the direction of the diaphragm 18, so that the usual negative pressure builds up in the outer recirculation space 44b which is used to insert the outer ones Recirculation 54 through the recirculation openings 56 is required.
  • inflow openings 148 are provided in the flame tube 14, but these are not the actual recirculation openings.
  • the inflow openings 148 are overlapped on the outside of the flame tube 14 by a sleeve 140 of the burner tube 10 which, in relation to the axis 30, is at a radial distance from an outer wall 142 of the flame tube and one Outer wall 144 of the support tube runs.
  • the sleeve 140 extends over the inflow openings 148 in the direction of a downstream end of the flame tube 14 and ends with the recirculation opening 56 for the cooled flue gas used for external recirculation 54 from the boiler room, so that during the warm operating state and outside In the starting phase of this flue gas, it first flows through the recirculation opening 56 into a space 150 between the sleeve 140 and the outside 142 of the flame tube 14 and from this space 150 through the inflow openings 148 into the recirculation space 44.
  • the sleeve 140 also extends over a front section 152 of the support tube 12 and overlaps ventilation openings 154a which connect the intermediate space 150 with the antechamber 16.
  • the sleeve 140 abuts the ventilation openings 154a on the outside 144 of the support tube 12 with a flange 156 and is preferably held by this flange 156 from the support tube 12, so that the intermediate space 150 is only accessible from the boiler space via the recirculation opening 56 is.
  • the ventilation openings 154a can be closed by a slide 154b which is arranged in the interior of the support tube 12 and is guided with an outer surface 158 on the inside 17 of the support tube 12.
  • This slide 154b comprises an annular casing 160 which supports the outer surface 158 and in which two grooves 162 are machined at a distance from one another in the direction of the axis 30 are in which the sealing rings 164 are located.
  • the sealing rings are at such a distance that when the outside 158 of the slide 154b stands in front of the ventilation openings 154a and closes them, on both sides of the ventilation openings 154a for a seal between the slide 154b and the inside 17 of the support tube 12 worries.
  • the slide 154b is moved in the direction away from the orifice 18 so that it opens the ventilation openings 154a, fresh air can flow in through the ventilation openings 154a from the antechamber 16 into the intermediate space 150 and therefore suppresses the inflow of cold flue gases via the recirculation opening 56 , so that cold flue gases no longer flow into the recirculation space 44 through the inflow openings 148, but essentially fresh air.
  • the external recirculation 54 is thus suppressed during the start-up phase of the burner and the mixing space 46 is additionally supplied with oxygen-rich fresh air via the peripheral openings 42.
  • a linkage 166 is guided through the antechamber 16 and is connected to the actuating member 70.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Un brûleur pour la production de gaz chauds comprend un tube (10) formé d'un tube de support (12) relié à un tube-foyer (14) et un ajutage (28) situé dans le tube de support, par lequel sort un jet de combustible (36). Un diaphragme (18) qui sépare une préchambre (16) d'une chambre de combustion (20) dans le tube du brûleur est pourvu d'un passage (38) central à travers lequel passe le jet de combustible. Des orifices de recirculation (56) ménagés dans le tube-foyer assurent une recirculation extérieure (54) du gaz de fumée refroidi et un élément (62) sert à interrompre la recirculation extérieure pendant une phase de démarrage du brûleur. Afin d'améliorer ce brûleur de sorte que la recirculation extérieure puisse être interrompue de manière fiable pendant la phase de démarrage, l'élément d'interruption de la recirculation extérieure est situé à l'intérieur du tube du brûleur et peut être commandé par un élément de commande guidé à l'intérieur du tube de support.
EP93906562A 1992-03-21 1993-03-19 Bruleur pauvre en oxyde d'azote Expired - Lifetime EP0585441B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4209221 1992-03-21
DE4209221A DE4209221A1 (de) 1992-03-21 1992-03-21 Stickoxidarmer brenner
PCT/EP1993/000666 WO1993019325A1 (fr) 1992-03-21 1993-03-19 Bruleur pauvre en oxyde d'azote

Publications (2)

Publication Number Publication Date
EP0585441A1 true EP0585441A1 (fr) 1994-03-09
EP0585441B1 EP0585441B1 (fr) 1997-07-30

Family

ID=6454691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93906562A Expired - Lifetime EP0585441B1 (fr) 1992-03-21 1993-03-19 Bruleur pauvre en oxyde d'azote

Country Status (6)

Country Link
US (1) US5370526A (fr)
EP (1) EP0585441B1 (fr)
AT (1) ATE156251T1 (fr)
DE (2) DE4209221A1 (fr)
HU (1) HUT66253A (fr)
WO (1) WO1993019325A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0972990A1 (fr) 1998-07-17 2000-01-19 MAN B & W Diesel Aktiengesellschaft Brûleur à combustion quasi stochiométrique de combustible liquide ou gazeux

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309115A1 (de) * 1993-03-23 1994-09-29 Viessmann Werke Kg Verfahren zum Betrieb eines Ölverdampfungsbrenners
EP0683884B1 (fr) * 1993-12-18 2001-02-28 Deutsches Zentrum für Luft- und Raumfahrt e.V. Bruleur a flamme bleue ajustable
ES2154722T3 (es) * 1993-12-18 2001-04-16 Deutsch Zentr Luft & Raumfahrt Quemador de llama azul con combustion optimizada.
DE4430889A1 (de) * 1993-12-18 1995-07-06 Deutsche Forsch Luft Raumfahrt Verbrennungsoptimierter Blaubrenner
DE4415717C2 (de) * 1994-05-04 2001-03-01 Man B & W Diesel Ag Brenner
DE29518918U1 (de) * 1995-11-29 1996-01-25 MEKU Metallverarbeitungs-GmbH, 78083 Dauchingen Mischeinrichtung für einen Brenner
CA2205143C (fr) * 1996-05-14 2003-07-15 Ethyl Corporation Procede et produits permettant d'ameliorer l'efficacite de combustion de combustibles de chauffage hydrocarbones
DE19814768A1 (de) * 1998-04-02 1999-10-07 Viessmann Werke Kg Blaubrenner
DE19832130C2 (de) * 1998-07-17 2002-03-14 Man B & W Diesel Ag Brenner, insbesondere für flüssige Brennstoffe
US6986658B2 (en) * 2002-03-16 2006-01-17 Exxonmobil Chemical Patents, Inc. Burner employing steam injection
US6881053B2 (en) * 2002-03-16 2005-04-19 Exxonmobil Chemical Patents Inc. Burner with high capacity venturi
EP1495263B1 (fr) * 2002-03-16 2015-04-29 ExxonMobil Chemical Patents Inc. BRULEUR AMELIORE AVEC DE FAIBLES EMISSIONS DE NOx
US6887068B2 (en) * 2002-03-16 2005-05-03 Exxonmobil Chemical Patents Inc. Centering plate for burner
US6869277B2 (en) * 2002-03-16 2005-03-22 Exxonmobil Chemical Patents Inc. Burner employing cooled flue gas recirculation
US7322818B2 (en) * 2002-03-16 2008-01-29 Exxonmobil Chemical Patents Inc. Method for adjusting pre-mix burners to reduce NOx emissions
US6866502B2 (en) 2002-03-16 2005-03-15 Exxonmobil Chemical Patents Inc. Burner system employing flue gas recirculation
US6893252B2 (en) * 2002-03-16 2005-05-17 Exxonmobil Chemical Patents Inc. Fuel spud for high temperature burners
US6893251B2 (en) 2002-03-16 2005-05-17 Exxon Mobil Chemical Patents Inc. Burner design for reduced NOx emissions
US6884062B2 (en) * 2002-03-16 2005-04-26 Exxonmobil Chemical Patents Inc. Burner design for achieving higher rates of flue gas recirculation
WO2003081137A1 (fr) * 2002-03-16 2003-10-02 Exxonmobil Chemical Patents Inc. Bouchon amovible de port d'allumage destine a etre employe dans des bruleurs
US6846175B2 (en) * 2002-03-16 2005-01-25 Exxonmobil Chemical Patents Inc. Burner employing flue-gas recirculation system
US20030175635A1 (en) * 2002-03-16 2003-09-18 George Stephens Burner employing flue-gas recirculation system with enlarged circulation duct
US20030175634A1 (en) * 2002-03-16 2003-09-18 George Stephens Burner with high flow area tip
US6890171B2 (en) 2002-03-16 2005-05-10 Exxonmobil Chemical Patents, Inc. Apparatus for optimizing burner performance
US6890172B2 (en) 2002-03-16 2005-05-10 Exxonmobil Chemical Patents Inc. Burner with flue gas recirculation
DE502006005173D1 (de) * 2006-02-22 2009-12-03 Tempratec Ltd Vorrichtung und Verfahren zum Verbrennen eines Brennstoffes
DE202006013853U1 (de) * 2006-09-07 2006-12-21 Meku Metallverarbeitungs Gmbh & Co. Kg Mischeinrichtung für einen Brenner
DE102010051806A1 (de) * 2010-11-18 2012-05-24 Linde Aktiengesellschaft Brenner mit einstellbarer Rauchgasrezirkulation
WO2014024943A1 (fr) 2012-08-07 2014-02-13 日野自動車 株式会社 Brûleur destiné à des dispositifs de purification de gaz d'échappement
CN104136845B (zh) 2012-08-07 2015-09-23 日野自动车株式会社 排气净化装置用燃烧器
AU2013300488B2 (en) 2012-08-07 2015-04-23 Hino Motors, Ltd. Burner
CN104603539B (zh) 2012-08-13 2017-06-23 日野自动车株式会社 燃烧器
DE102016113222A1 (de) * 2016-07-18 2018-01-18 Webasto SE Brenner und Fahrzeugheizgerät
US11353211B2 (en) * 2018-04-09 2022-06-07 Gas Technology Institute High turndown ratio gaseous fuel burner nozzle and control

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532740A (en) * 1948-02-10 1950-12-05 William H Speer Fuel burner provided with combustion gas recirculating means
US2882843A (en) * 1954-02-24 1959-04-21 Ricardo & Company Combustion apparatus
US2918117A (en) * 1956-10-04 1959-12-22 Petro Chem Process Company Inc Heavy fuel burner with combustion gas recirculating means
US3869246A (en) * 1973-12-26 1975-03-04 Gen Motors Corp Variable configuration combustion apparatus
DE3241730A1 (de) * 1982-11-11 1984-05-17 Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5300 Bonn Vergasungsoelbrenner mit einer oelzerstaeubungsvorrichtung
DE3666625D1 (en) * 1985-02-21 1989-11-30 Tauranca Ltd Fluid fuel fired burner
DE3906854C1 (en) * 1989-03-03 1990-10-31 Buderus Heiztechnik Gmbh, 6330 Wetzlar, De Burner tube for a blue-burning oil burner
DE3938786A1 (de) * 1989-11-23 1991-05-29 Elco Oel & Gasbrenner Brenner zur verbrennung von fluessigen oder gasfoermigen brennstoffen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9319325A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0972990A1 (fr) 1998-07-17 2000-01-19 MAN B & W Diesel Aktiengesellschaft Brûleur à combustion quasi stochiométrique de combustible liquide ou gazeux

Also Published As

Publication number Publication date
EP0585441B1 (fr) 1997-07-30
WO1993019325A1 (fr) 1993-09-30
HU9303287D0 (en) 1994-03-28
HUT66253A (en) 1994-10-28
DE59306997D1 (de) 1997-09-04
ATE156251T1 (de) 1997-08-15
US5370526A (en) 1994-12-06
DE4209221A1 (de) 1993-09-23

Similar Documents

Publication Publication Date Title
EP0585441B1 (fr) Bruleur pauvre en oxyde d'azote
EP0164576B1 (fr) Brûleur industriel pour combustibles gazeux ou liquides
DE69306039T2 (de) Verbrennungsverfahren mit niedrigem NOx-Gehalt und Brennervorrichtung zur Durchführung des Verfahrens
DE2521840C2 (de) Brenner für flüssige Brennstoffe
DE2343861C2 (de) Brenner für Öfen der Metallverarbeitung
EP0685683A2 (fr) Brûleur industriel à faible émission de NOx
DE2853309C2 (de) Keramischer Brennerkopf für gasförmigen Brennstoff
DE4424599A1 (de) Verfahren und Vorrichtung zum Betreiben eines kombinierten Brenners für flüssige und gasförmige Brennstoffe
DE19627203A1 (de) Brenner
DE3906854C1 (en) Burner tube for a blue-burning oil burner
EP0543324A2 (fr) Brûleur pour fours industriels
DE4319213A1 (de) Brenner zur schnellen und motorunabhängigen Aufheizung eines Abgaskatalysators
DE2162009A1 (de) Brenneranordnung mit Einrichtung zur Verstellung der Flammengröße
DE2410141C3 (de) Brenner for fluide Brennstoffe
DE4238529C2 (de) Brenner zur Heißgaserzeugung
DE969108C (de) Ventil, insbesondere Dreiwegemagnetventil zur Steuerung von Druckkolben
EP2622276B1 (fr) Brûleur à mazout à prémélange
DE4244400A1 (de) Brenner zur Heißgaserzeugung
DE1401932A1 (de) Verfahren zum Betrieb von Brennern fuer Kesselfeuerungen
EP1221571B1 (fr) Appareil de combustion avec refroidissement
DE2620424A1 (de) Brennkammer mit variabler geometrie
DE19501041C2 (de) Brenner mit optimalem Startverhalten
DE549668C (de) Brenner fuer fluessigen und gas- oder staubfoermigen Brennstoff
DE19920112B4 (de) Brenner
DE577358C (de) Verfahren zur Verbrennung von kohlenwasserstoffhaltigen Mineraloelen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19931113

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR IT LI

17Q First examination report despatched

Effective date: 19950109

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR IT LI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19970730

REF Corresponds to:

Ref document number: 156251

Country of ref document: AT

Date of ref document: 19970815

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: KIRKER & CIE SA

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 59306997

Country of ref document: DE

Date of ref document: 19970904

ET Fr: translation filed
RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: DEUTSCHES ZENTRUM FUER LUFT- UND RAUMFAHRT E.V.

RAP4 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: DEUTSCHES ZENTRUM FUER LUFT- UND RAUMFAHRT E.V.

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070302

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20070323

Year of fee payment: 15

Ref country code: AT

Payment date: 20070323

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20070329

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20070321

Year of fee payment: 15

BERE Be: lapsed

Owner name: DEUTSCHE FORSCHUNGSANSTALT FUR *LUFT- UND RAUMFAHR

Effective date: 20080331

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080319

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20081125

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080331

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081001

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080331