EP2051005B1 - Brûleur à jet d'air central - Google Patents

Brûleur à jet d'air central Download PDF

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Publication number
EP2051005B1
EP2051005B1 EP09151678.1A EP09151678A EP2051005B1 EP 2051005 B1 EP2051005 B1 EP 2051005B1 EP 09151678 A EP09151678 A EP 09151678A EP 2051005 B1 EP2051005 B1 EP 2051005B1
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EP
European Patent Office
Prior art keywords
zone
burner
annular zone
axial
annular
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.)
Active
Application number
EP09151678.1A
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German (de)
English (en)
Other versions
EP2051005A2 (fr
EP2051005A3 (fr
Inventor
Albert D. Larue
William J. Kahle
Alan N. Sayre
Hamid Sarv
Daniel R. Rowley
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.)
Babcock and Wilcox Co
Original Assignee
Babcock and Wilcox Co
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 Babcock and Wilcox Co filed Critical Babcock and Wilcox Co
Priority to EP09151678.1A priority Critical patent/EP2051005B1/fr
Priority to ES09151678.1T priority patent/ES2636594T3/es
Priority to PL09151678T priority patent/PL2051005T3/pl
Publication of EP2051005A2 publication Critical patent/EP2051005A2/fr
Publication of EP2051005A3 publication Critical patent/EP2051005A3/fr
Application granted granted Critical
Publication of EP2051005B1 publication Critical patent/EP2051005B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus

Definitions

  • the present invention relates generally to fuel burners and, in particular, to a new and useful pulverized coal burner and method of combustion which achieves low NO x emissions by supplying oxygen directly to the center of the burner flame in a manner so as to create a fuel rich internal combustion zone within the burner flame and accelerate fuel combustion.
  • NO x is a byproduct produced during the combustion of coal and other fossil fuels.
  • Environmental concerns regarding the effects of NO x have prompted enactment of NO x emissions regulations requiring sharp NO x emission reductions from industrial and utility power plants in several countries including the United States.
  • Current commercial methods and apparatuses for reducing NO x emissions have been successful in lowering NO x emissions from the levels emitted in previous years; however, further advances, beyond those of currently known methods and apparatuses, are needed to maintain compliance with current NO x emissions regulations.
  • a variety of low NO x burners are commercially available and widely used to fire pulverized coal (PC) and other fossil fuels in a NO x reducing manner as compared to conventional burners. Examples of such burners are The Babcock & Wilcox Company's DRB-XCL ® and DRB-4Z ® burners. Common to these and other low NO x burner designs is an axial coal nozzle surrounded by multiple air zones which supply secondary air (SA). During operation, PC suspended in a primary air (PA) stream, is injected into the furnace through an axial coal nozzle, as an axial jet, with little or no radial deflection. Ignition of the PC is accomplished by swirling SA, thereby causing recirculation of hot gases along the incoming fuel jet.
  • PA primary air
  • a fraction of the SA is supplied to an air zone in close proximity to the coal nozzle and swirled to a relatively greater extent than the SA supplied to the other air zones to accomplish ignition.
  • the remaining SA from the burner is introduced through air zones further outboard in the burner utilizing less swirl, so as to mix slowly into the burner flame, thereby providing fuel rich conditions in the root of the flame.
  • Such conditions promote the generation of hydrocarbons which compete for available oxygen and serve to destroy NO x and/or inhibit the oxidation of fuel-bound and molecular nitrogen to NO x .
  • NO x emissions can further be reduced by staged combustion, wherein the burner is provided with less than stoichiometric oxygen for complete combustion.
  • a fuel rich environment results at the burner flame.
  • the fuel rich environment inhibits NO x formation by forcing NO x precursors to compete with uncombusted fuel in an oxygen lean environment.
  • Combustion is then staged by providing excess oxygen to the boiler at a point above the burner wherein the excess fuel combusts at a lower temperature, thus precluding the production of thermal NO x as the combustion occurs at a lower temperature away from the burner flame.
  • Staging also serves to lessen oxygen concentrations during the combustion process which inhibits oxidation of fuel bound nitrogen (fuel NO x ).
  • Oxygen for staged combustion is normally provided in the form of air via air staging ports, commonly called Over Fire Air (OFA) ports, in a system utilizing low NO x burners.
  • OFA Over Fire Air
  • U.S. Patent No. 5,697,306 to LaRue, and U.S. Patent No. 5,199,355 to LaRue, disclose low NO x burners that may be combined with air staged combustion methods to further reduce NO x emissions.
  • low NO x burners tend to form long flames and produce higher levels of unburned combustibles.
  • Long flames are not always desirable as they may be incompatible with furnace depth or height, and can impair boiler operation by causing flame impingement, slagging, and/or boiler tube corrosion.
  • DE 102 01 558 A1 relates to a burner for the combustion of particulate fuel.
  • DE 35 35 873 A1 relates to a solid fuel burner and combustion method using solid fuel burner.
  • US 5 651 320 A relates to a burner for burning powdered fuel.
  • this document does not teach, at least, a feeder duct radially interposed between a portion of a first annular zone and an axial zone, wherein the feeder duct provides a gas comprising oxygen to the axial zone, and a means provided for regulating flow of gas through the feeder duct.
  • the present teachings solve the aforementioned problems associate with delayed combustion produced by typical low NO x burners and introduces a new burner apparatus and method of combusting fossil fuels to further reduce NO x emissions in commercial and utility boilers.
  • a burner according to the present teachings is suitable for firing pulverized coal (PC) or gaseous hydrocarbons.
  • the present teaching comprise an axial zone concentrically surrounded by a first annular zone.
  • the first annular zone provides fuel to the burner at a predetermined velocity so as to create a fuel jet exiting the burner and subsequently forming a burner flame via combustion in the presence of oxygen.
  • the axial zone produces a center air jet piercing the burner flame along its internal axis.
  • the center air jet provides oxygen along the center axis of the burner flame, allowing the flame to combust from the inside out, while maintaining an overall fuel rich environment in the flame root thereby suppressing NO x formation.
  • Additional oxygen supplied by second and third annular zones concentrically surrounding the first annular zone further reduces NO x formation while providing a means for accelerating combustion.
  • Flow conditioning devices of the second and third annular zones aerodynamically suppress fuel jet expansion. Within this aerodynamic suppression, swirl from the air exiting the second and third annular zones creates an internal recirculation zone along the outer boundary of the flame zone which inhibits NO x formation.
  • the internal recirculation zone causes NO x formed along the outer air-rich periphery of the flame to recirculate back into the fuel rich flame core.
  • the hotter flame temperature resulting from the inside out combustion of the center air jet, cause uncombusted hydrocarbon radicals to scavenge available oxygen within the IRZ, thereby suppressing the formation of NO x , and reducing NO back to other nitrogenous species.
  • a wider, shorter flame envelope results as flame temperature increases due to the accelerated combustion of fuel from the inside out and outside in within the IRZ.
  • Another aspect of the present teachings can be considered a method of reducing NO x emissions in a center air jet burner comprising, providing a burner having an axial zone concentrically surrounded by a first annular zone, providing the axial zone with a first gas comprising oxygen, wherein the first gas exits the axial zone at a velocity between about 25 m/s (5000 ft/min) and about 51 m/s (10,000 ft/min) providing the first annular zone with a carrier gas comprising a pulverized coal, wherein the carrier gas exits the axial zone at a velocity between about 15 m/s (3000 ft/min) and about 25 m/s (5000 ft/min).
  • Yet another aspect of the present teachings can be considered a method of reducing NO x emissions in a center air jet burner comprising, providing a four zone burner, wherein the innermost zone is an axial zone concentrically surrounded by a first annular zone, which in turn is concentrically surrounded by a second annular zone, which in turn is concentrically surrounded by a third annular zone, providing the axial zone with a first gas comprising oxygen, providing the first annular zone with a carrier gas comprising a pulverised coal, providing the second annular zone with a second gas comprising oxygen, providing the third annular zone with a third gas comprising oxygen, providing the burner with the carrier gas at a velocity greater than about 15 m/s (3000 ft/min), providing the burner with the first gas at a velocity greater than the carrier gas, providing the burner with the second gas at a velocity less than the carrier gas, providing the burner with the third gas at a velocity greater than the carrier gas, combusting the pulverized coal in the carrier gas stream
  • FIG. 1 there is shown a schematic sectional view of a burner depicted in accordance with the present invention.
  • Axial pipe 6, defining an axial zone 25 therein, is concentrically surrounded by a first annular pipe 3 wherein the area between the two pipes defines a first annular zone 11.
  • feeder duct 9 Radially interposed between a portion of first annular pipe 3 and axial pipe 6 is feeder duct 9 such that axial pipe 6 and windbox 51 are in fluid communication with opposite ends of feeder duct 9.
  • FIG. 3 a top view of feeder duct 9 radially interposed between at least a portion of first annular pipe 3 and axial pipe 6 (not shown in FIG. 3 ) is provided, such that axial pipe 6 and windbox 51 are in fluid communication with opposite ends of feeder duct 9.
  • secondary air is supplied by forced draft fans (not shown), preheated in air heaters (not shown), and under pressure to windbox 51.
  • Feeder duct 9 in turn provides secondary air from windbox 51 to axial pipe 6, at a rate controlled by damper 10.
  • An air flow measuring device 12 quantifies the secondary air flowing through feeder duct 9.
  • a pulverizer (not shown) grinds coal which is conveyed with primary air through a conduit connected to a burner elbow 2.
  • An igniter (not shown) may be positioned on the axis of the burner, penetrating elbow 2, plug 5, and extending through axial pipe 6.
  • Pulverized coal and primary air (PA/PC) 1 pass through the burner elbow 2.
  • the pulverized coal generally travels along the outer radius of elbow 2 and concentrates into a stream along the outer radius at the elbow exit.
  • the pulverized coal enters first annular zone 11 and encounters a deflector 4 which redirects the coal stream into plug 5 and disperses the coal.
  • Axial pipe 6 is attached to the downstream side of plug 5.
  • First annular pipe 3 expands in section 3A to form a larger diameter section 3B.
  • the dispersed coal travels along first annular zone 11 wherein bars and chevrons 7 provide more uniform distribution of the pulverized coal before exiting the first annular zone 11 as a fuel jet.
  • Wedged shaped pieces 9A and 9B ( Fig. 3 ) provide a more contoured flow path for the PA/PC 1 as it travels past feeder duct 9.
  • a flow conditioning device 30 may be used to disperse the coal to increase the rate at which it interacts with the secondary air.
  • Flow conditioning device 30 may consist of swirl vanes and/or one or more bluff bodies to locally obstruct flow and induce swirl.
  • Another flow conditioning device 13 may be positioned at the end of axial pipe 6 to provide more uniform flow to secondary air as it exits axial zone 25 into burner throat 8, and out into the furnace (not shown) in the form of a center air jet.
  • Flow conditioning device 13 can be vanes, perforated plates, or other commonly used devices to provide more uniform flow. In some cases, flow conditioning device 13 may provide swirl to the core air to further accelerate coal ignition and reduce emissions.
  • An aspect pertaining to the operational method of the present invention is the creation of a center air jet within with the fuel jet stream as it exits throat 8 and enters the furnace.
  • the center air jet will have a velocity exceeding that of the fuel jet so as to create a velocity gradient within the flame which promotes ignition of the fuel from the inside out utilizing the oxygen from the center air jet.
  • Optimum operating conditions occur when PA/PC exits the first annular zone at a velocity between about 15 m/s (3,000 ft/min) and about 25 m/s (4,500 ft/min). Optimum operating conditions further occur when secondary air exits axial zone 25 at a velocity between about 25 m/s (5,000 ft/min) and 51 m/s (10,000 ft/min) and more preferably between about 28 m/s (5,500 ft/min) and 38 m/s (7,500 ft/min).
  • Damper 15 controls the entry of additional secondary air to the burner assembly.
  • damper 15 allows secondary air to flow into a second annular zone 16 concentrically surrounding first annular zone 11, wherein the second annular zone 16 is defined as the area between pipe 3B and barrel 19.
  • Damper 15 further allows secondary air to flow into third annular zone 17 concentrically surrounding second annular zone 16, wherein the third annular zone 16 is defined as the area between barrel 19 and outside burner zone wall 38.
  • Damper 15 can be positioned to preferentially throttle secondary air to one zone over the other, or to supply lesser quantities of secondary air to both zones.
  • An igniter (not shown) may optionally be situated in annular zone 17, if not through pipe 6.
  • Optimal operating conditions for utilizing all three annular zones to provide secondary air for combustion occur when between about 20 percent and about 40 percent of the total oxygen provided to the burner by secondary air is provided through axial zone 25, more preferably between about 25 percent and 35 percent.
  • About 10 percent to about 30 percent of the total oxygen provided to the burner by secondary air is provided through second annular zone 16, more preferably between about 15 to about 25 percent.
  • About 40 percent to about 70 percent of the total oxygen provided to the burner by secondary air is provided through third annular air zone 17, more preferably between about 50 percent to about 65 percent.
  • Air flow measurement device 18 measures the secondary air flow through second annular zone 16 and third annular zone 17.
  • Optimum operating conditions occur when secondary air exits second annular zone 16 at a velocity between about 15 m/s (3000 ft/min) and 23 m/s (4500 ft/min), more preferably between about 16 m/s (3100 ft/min) and about 20 m/s (3900 ft/min).
  • secondary air exits third annular zone 17 at a velocity between about 28 (5500 ft/min) and about 38 m/s (7500 ft/min) more preferably the velocity is between about 29 m/s (5700 ft/min) and about 34 m/s (700 ft/min).
  • Optimal air shear conditions generally occur when the inner diameter of the axial zone is between about 0.2 (9 inches) and about 0.5 m (20 inches), the inner diameter of the first annular zone is between about 0.4m (15 inches) and about 0.8 (30 inches), the inner diameter of the second annular zone is between about 0.5 (20 inches) and about 1m (40 inches), and wherein the inner diameter of the third annual zone is between about 0.6 and about 1.3m (22 and about 50 inches).
  • Adjustable vanes 21 are situated in the second annular zone 16 to provide swirled secondary air prior to exiting second annular zone 16.
  • Other air distribution devices such as perforated plates and ramps may also be installed at the end of second annular zone 16.
  • Fixed vanes 22A and adjustable vanes 22B impart swirl to the secondary air passing through third annular zone 17.
  • vane 23 which may alternatively be placed in the middle of the air zone exit, deflects part of the air away from the primary combustion zone.
  • FIG. 2 a graphical depiction, wherein arrows identify the flow paths of secondary air and PA/PC 1, is provided.
  • a gas comprising oxygen at a greater concentration than air may be utilized in place of all or part of the secondary air.
  • a hydrocarbon fuel other than pulverize coal may be utilized as fuel.
  • a center conduit may be placed within axial zone 25 such that axial pipe 6 concentrically surrounds the center conduit.
  • the center conduit may house an igniter, an oil atomizer or gas alternative, or a lance for introduction of concentrated oxygen or additional hydrocarbon fuel into the flame core either axially or by radial dispersion.
  • a plurality of center conduits may be placed within axial zone 25 such that axial pipe 6 concentrically surrounds each of the plurality of conduits.
  • the plurality of center conduits may provide concentrated oxygen in more than one stream, or at least one of the conduits may provide additional coal of other hydrocarbon fuel for combustion.
  • multiple feeder ducts and/or booster fans or conduits may be utilized to provide additional secondary air or oxygen to axial zone 25.
  • staged combustion is utilized with the burner and NO x reduction methods of the present invention to further reduce NO x emissions.
  • an alternative air ducting system may be devised wherein secondary air is ducted through outer wall 51B of windbox 51 and fed into axial zone 25 through the outer radius of an enlarged burner elbow or elsewhere to form a axial zone 25 in fluid connection with the windbox 51.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Claims (13)

  1. Brûleur à jet d'air central, comprenant:
    une zone axiale (25) entourée de façon concentrique par une première zone annulaire (11), 1a première zone annulaire étant entourée de façon concentrique par une deuxième zone annulaire (16), et la deuxième zone annulaire étant entourée de façon concentrique par une troisième zone annulaire (17), dans lequel, dans la zone axiale, la première zone annulaire, la deuxième zone annulaire et la troisième zone annulaire sont séparées par un tuyau axial (6), un tuyau annulaire (3) et un cylindre (19), respectivement,
    un conduit d'alimentation (9) interposé radialement entre une partie de la première zone annulaire (11) et la zone axiale (25), dans lequel le conduit d'alimentation (9) fournit un gaz contenant de l'oxygène à la zone axiale (25),
    des moyens (10) pour réguler l'écoulement du gaz à travers le conduit d'alimentation (9),
    des moyens pour fournir un carburant de combustion à la première zone annulaire, et
    des moyens pour fournir de l'air à la deuxième zone annulaire, et des moyens pour fournir de l'air à la troisième zone annulaire, dans lequel la zone axiale et les deuxième et troisième zones annulaires fournissent de l'air secondaire pour la combustion, et dans lequel le gaz contenant de l'oxygène sort de la zone axiale pour former le jet d'air central.
  2. Brûleur selon la revendication 1, dans lequel la zone axiale contient un dispositif de conditionnement d'écoulement (13).
  3. Brûleur selon la revendication 1 ou la revendication 2, dans lequel la première zone annulaire contient un dispositif de conditionnement d'écoulement (30) .
  4. Brûleur selon l'une quelconque des revendications précédentes, dans lequel la première zone annulaire contient des moyens (7) pour réaliser une distribution de charbon plus uniforme.
  5. Brûleur selon les revendications 1 à 4, comprenant en outre une aube (21) dans la deuxième zone annulaire.
  6. Brûleur selon l'une quelconque des revendications 1 à 5, comprenant en outre une aube (22, 23) dans la troisième zone annulaire.
  7. Brûleur selon la revendication 1, comprenant en outre des moyens (15) pour réguler un écoulement d'air vers la seconde zone annulaire, et des moyens (15) pour réguler un écoulement d'air vers la troisième zone annulaire.
  8. Brûleur selon l'une quelconque des revendications précédentes, dans lequel une boîte à vent (51) se trouve en communication fluidique avec la deuxième zone annulaire et la troisième zone annulaire.
  9. Brûleur selon la revendication 8, dans lequel la boîte à vent est en communication fluidique avec la zone axiale.
  10. Brûleur selon l'une quelconque des revendications précédentes, dans lequel un allumeur réside à l'intérieur de la zone axiale.
  11. Brûleur selon l'une quelconque des revendications précédentes, comprenant en outre un conduit qui est entouré de façon concentrique par la zone axiale.
  12. Brûleur selon la revendication 11, dans lequel le conduit comprend des moyens pour disperser radialement un gaz dans la zone axiale.
  13. Brûleur selon l'une quelconque des revendications 11 ou 12, dans lequel le conduit comprend des moyens pour disperser de façon longitudinale un gaz dans la zone axiale.
EP09151678.1A 2006-08-16 2006-08-16 Brûleur à jet d'air central Active EP2051005B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09151678.1A EP2051005B1 (fr) 2006-08-16 2006-08-16 Brûleur à jet d'air central
ES09151678.1T ES2636594T3 (es) 2006-08-16 2006-08-16 Quemador de chorro de aire central
PL09151678T PL2051005T3 (pl) 2006-08-16 2006-08-16 Palnik o środkowym strumieniu powietrza

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09151678.1A EP2051005B1 (fr) 2006-08-16 2006-08-16 Brûleur à jet d'air central
EP06254290A EP1892470B8 (fr) 2006-08-16 2006-08-16 Procédé pour réduire les émissions de NOx dans un brûleur à charbon pulvérisé

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP06254290.7 Division 2006-08-16
EP06254290A Division EP1892470B8 (fr) 2006-08-16 2006-08-16 Procédé pour réduire les émissions de NOx dans un brûleur à charbon pulvérisé

Publications (3)

Publication Number Publication Date
EP2051005A2 EP2051005A2 (fr) 2009-04-22
EP2051005A3 EP2051005A3 (fr) 2010-06-09
EP2051005B1 true EP2051005B1 (fr) 2017-06-14

Family

ID=37564416

Family Applications (3)

Application Number Title Priority Date Filing Date
EP09151678.1A Active EP2051005B1 (fr) 2006-08-16 2006-08-16 Brûleur à jet d'air central
EP06254290A Active EP1892470B8 (fr) 2006-08-16 2006-08-16 Procédé pour réduire les émissions de NOx dans un brûleur à charbon pulvérisé
EP09170949.3A Active EP2138765B1 (fr) 2006-08-16 2006-08-16 Procédé de combustion

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP06254290A Active EP1892470B8 (fr) 2006-08-16 2006-08-16 Procédé pour réduire les émissions de NOx dans un brûleur à charbon pulvérisé
EP09170949.3A Active EP2138765B1 (fr) 2006-08-16 2006-08-16 Procédé de combustion

Country Status (6)

Country Link
EP (3) EP2051005B1 (fr)
AT (1) ATE497126T1 (fr)
DE (1) DE602006019860D1 (fr)
DK (2) DK1892470T3 (fr)
ES (3) ES2636594T3 (fr)
PL (3) PL2138765T3 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2933060C2 (de) * 1979-08-16 1987-01-22 L. & C. Steinmüller GmbH, 5270 Gummersbach Brenner zur Verbrennung von staubförmigen Brennstoffen
US4924784A (en) * 1984-02-27 1990-05-15 International Coal Refining Company Firing of pulverized solvent refined coal
DE3535873A1 (de) * 1985-10-08 1987-04-09 Theo Dipl Ing Burkard Verfahren zur no(pfeil abwaerts)x(pfeil abwaerts)-armen verbrennung mittels eines radikale bildenden mediums
EP0445938B1 (fr) * 1990-03-07 1996-06-26 Hitachi, Ltd. Brûleur à charbon pulvérisé, chaudière au charbon pulvérisé et procédé pour la combustion de charbon pulvérisé
US5199355A (en) 1991-08-23 1993-04-06 The Babcock & Wilcox Company Low nox short flame burner
DE4325643A1 (de) * 1993-07-30 1995-02-02 Lentjes Kraftwerkstechnik Brenner zum Verbrennen von staubförmigem Brennstoff
US5697306A (en) 1997-01-28 1997-12-16 The Babcock & Wilcox Company Low NOx short flame burner with control of primary air/fuel ratio for NOx reduction
EP1306614B1 (fr) * 2000-08-04 2015-10-07 Mitsubishi Hitachi Power Systems, Ltd. Bruleur a combustible solide
ATE365891T1 (de) * 2001-01-18 2007-07-15 Alstom Power Boiler Gmbh Brenner zur verbrennung von staubförmigem brennstoff
CA2485934C (fr) * 2002-05-15 2009-12-15 Praxair Technology, Inc. Combustion a faible formation de nox

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1892470B8 (fr) 2011-03-09
PL2138765T3 (pl) 2016-09-30
DK1892470T3 (da) 2011-03-21
PL2051005T3 (pl) 2017-10-31
ES2636594T3 (es) 2017-10-06
ES2576008T3 (es) 2016-07-04
EP2138765A2 (fr) 2009-12-30
EP1892470B1 (fr) 2011-01-26
DE602006019860D1 (de) 2011-03-10
ATE497126T1 (de) 2011-02-15
ES2358273T3 (es) 2011-05-09
EP1892470A1 (fr) 2008-02-27
EP2138765B1 (fr) 2016-03-30
DK2138765T3 (en) 2016-07-25
EP2051005A2 (fr) 2009-04-22
PL1892470T3 (pl) 2011-07-29
EP2051005A3 (fr) 2010-06-09
EP2138765A3 (fr) 2010-09-22

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