Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23Q—IGNITION; EXTINGUISHING-DEVICES
  • F23Q9/00—Pilot flame igniters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23Q—IGNITION; EXTINGUISHING-DEVICES
  • F23Q3/00—Igniters using electrically-produced sparks
  • F23Q3/006—Details
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23Q—IGNITION; EXTINGUISHING-DEVICES
  • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
  • F23Q7/22—Details
  • F23Q7/24—Safety arrangements

Definitions

• the invention relates to a burner with an igniter and at least one ignition electrode, in particular one for installation in a burner of a gas turbine.
• a torch designed as a pilot burner with an igniter and ignition electrodes leading to the igniter is described, for example, in EP 0 193 838 B1.
• the detonator has the task of igniting the fuel.
• the ignition electrodes are attached to the outside of the pilot burner and run parallel to it
• the fuel feed is located inside the pilot burner and ends in fuel outlets.
• the ignition electrodes end in the region of the fuel outlet openings and ignite the fuel emerging there by means of a spark.
• the spark is generated by an ignition voltage between two ignition electrodes and is active during the entire ignition duration.
• Pilot burners mounted ignition electrodes during transport or installation can adversely affect the functioning of the ignition electrodes. Damage or bending may therefore necessitate replacement of the ignition electrodes.
• the replacement of the ignition electrodes may also be necessary if one of the electrodes is so bent that, instead of between the electrode tips between an electrode line and another metallic component to the electric flashover and therefore the gas mixture can not be ignited.
• US 2,850,084 and US 5,860,804 essentially igniter are described with ignition electrodes, in which the ignition by heating an ignition electrode due to their high resistance, ie thermally. This form of ignition is referred to below as thermal ignition.
• thermal ignition The possibility of electronic or electrical ignition, for example by sparkover, is mentioned only in US 5,860,804.
• Ignition in particular to protect against possible contamination or damage.
• the regions of the ignition electrodes which adjoin the region of the ignition, ie which lead to the region of the ignition towards or away from it, are not protected by a corresponding protective element.
• Gas turbine torch frame are used and ignite with the help of a spark, however, compared to ignition of thermal igniters in their Functionality considerably less affected by possible bending.
• the invention has for its object to provide a gas turbine burner with at least one ignition electrode available, in which the above problem does not occur or only to a reduced extent.
• Another object of the present invention is to provide a gas turbine with an advantageous gas turbine combustor.
• gas turbine burner with the features of claim 1 and a gas turbine according to claim 15.
• the gas turbine burner can be designed in particular as a pilot burner.
• the solution of the problem is that the burner is equipped with at least one extending on its outer side ignition electrode, said electrode is associated with a protective element which projects beyond the outside of the burner and beyond the ignition electrode.
• the gas turbine according to the invention is equipped with such a gas turbine burner.
• EP 0 193 838 B1 describes a combustion chamber of a gas turbine with a burner, the ignition electrodes of the burner are not equipped with a protective element.
• the protective element is connected to the outside of the burner, so that the necessary stability is ensured.
• the protective element surrounds the ignition electrodes, wherein the ignition electrode is at least partially covered lengthwise, so that the at least one ignition electrode is optimally protected.
• the protective member may be U-shaped and fixed with the open side and the outside of the burner, so that the ignition electrode are protected from three sides to the outside.
• the protective element can completely enclose the electrodes at least in the front region near the electrode tips.
• the protective element may be formed by at least one rib, so that a better accessibility of the ignition electrodes is ensured.
• the rib can run parallel to the ignition electrode. There may also be at least one rib on each side of the ignition electrode.
• the protective element is made of a rigid and impact-resistant material, so that a deformation of the protective element, which could lead to a deformation of the internal ignition electrodes, is avoided.
• a further advantageous development is that the distance between the protective element and the ignition electrode is at least so great that when a starting voltage is applied to the ignition electrode, no flashover occurs between the ignition element
• the gas turbine combustor may comprise two ignition electrodes, each with an electrode tip.
• the ignition takes place by a sparkover at the electrode tips when applying an ignition voltage between the two ignition electrodes. The ignition is therefore not effected thermally.
• US Pat. No. 5,860,804 and US Pat. No. 5,865,651 also mention non-thermal igniters in general terms, in these documents no igniter is described in which a sparkover occurs between two
• the protective element according to the invention can preferably be assigned to a region of the ignition electrode which is used for
• Lead tip leads. This means that in this case the protective element does not reach as far as the electrode tip and does not protrude beyond the electrode tip. Rather, the area of the electrode is to be protected, which runs along the outside of the gas turbine burner, in other words, the supply line to the actual ignition at the electrode tip.
• the gas turbine burner according to the invention can in principle be rotationally symmetrical and the at least one ignition electrode extending on its outer side extend parallel to the axis of symmetry of the gas turbine burner.
• the gas turbine according to the invention can be equipped with a gas turbine burner according to the invention in one of the described embodiments.
• 1 shows a burner with an ignition electrode
• 2 shows a burner with ignition electrodes
• Protective element which has a U-shaped cross-section and surrounds the ignition electrodes in the front region
• FIG 3 shows a burner with ignition electrodes and a protective element which is formed from ribs and runs parallel to the ignition electrodes.
• the burner assembly shown in FIG 1 belongs to a gas turbine plant, the preferred field of application of the invention.
• the burner arrangement is, however, also suitable for gas-fired furnaces of boilers.
• the burner arrangement consists of at least one first burner 2 (not shown in FIG 1, see FIGS 2, 3), which serves as a pilot burner, and a second burner 1, which serves as a main burner and in the middle of the first burner 2 is used coaxially.
• the first burner 2 has a burner head 4 with a
• Swirl blading 3 can be operated with natural gas E and / or fuel H as fuel.
• the head 4 of the first burner 2 is coaxial with respect to the burner axis, surrounded by an air supply channel 6, which serves to supply the main portion of the combustion air L to a combustion zone (not shown) formed downstream of the burner head 4.
• the annular gap, the pressurized combustion air L is supplied from a compressor of the gas turbine plant. The hot fuel gases flow into the turbine blading.
• the serving as a main burner second burner 1 is supplemented by the first, serving as a pilot burner burner 2, ie In natural gas mode, it is possible to switch from pilot burner to main burner mode with its lower NOx values after starting up and warming up.
• the first burner 2 serves to stabilize the flame.
• the second burner comprises nozzle tubes 5 and an air supply channel 6.
• the nozzle tubes are connected to a fuel supply system (not shown) and used to mix petroleum, natural gas or other gaseous or liquid fuel with the supplied combustion air L.
• the air supply channel 6 passes the combustion air L. if necessary with added fuel to the flame area.
• the ignition of the first burner 2 supplied air-fuel mixture via a rod or tubular electrode assembly with two ignition electrodes 7.
• the ignition electrodes 7 are mainly parallel to the axis of the first burner 2. In the region of the support plate 9 through which the ignition electrodes are passed through, is the
• the distance between the ignition electrodes 7 of the outer wall of the first burner significantly larger.
• the distance of the ignition electrodes 7 from each other is greater in the region of the support plate than in the region of the outer wall of the first burner 2.
• the ignition electrodes are fastened with connecting pieces 11 on the outside of the first burner 2.
• a burner 2 is shown as an exemplary embodiment of a burner according to the invention, on the outer wall of which two ignition electrodes 7 extending in the longitudinal direction of the burner 2 are mounted.
• the burner 2 can in particular serve as the first burner in the burner arrangement described with reference to FIG.
• the ignition electrodes of the burner 2 are through a
• Protective element 8 covered which is formed in the present example as a U-shaped bent sheet 8.
• the legs of the sheet 8 each have an angled region, in they are attached to the outer wall of the burner 2.
• the attachment 10 is advantageously carried out by means of suitable detachable connecting elements, for example screws, so that, if necessary, access to the ignition electrodes 7 is possible.
• detachable connecting elements for example screws
• non-detachable connections are also possible instead of the detachable connection, for example welded connections.
• the U-shaped metal sheet extends at least over the front part of the ignition electrodes 7, ie the part which lies close to the electrode tips 12.
• the sheet 8 should be made of an impact resistant and rigid material such as e.g. Be made of steel.
• the distance of the sheet 8 from the ignition electrodes 7 should be at least so great that when a firing voltage applied to the ignition electrodes 7 no flashover between the fender 8 and the ignition electrodes 7 takes place.
• the concrete value for the distance depends on the dielectric strength of the medium between the electrodes 7 and the protective plate 8 as well as the geometry of the ignition electrodes and the temperature prevailing when the ignition voltage is applied. In the present embodiment with air as the medium, a safety distance of at least 5 mm should be maintained if the ignition voltage is 5 kV.
• FIG. 3 shows an ignition electrode 7 mounted in the burner 2 with two ignition electrodes 7 mounted on its outer wall.
• This burner 2 can also be used, in particular, as the first burner in the burner arrangement described with reference to FIG.
• the longitudinal ribs 8 project from the surface of the burner 2 via the ignition electrodes 7, so that the ignition electrodes 7 are protected from shocks.
• the ribs 8 are fixedly connected to the wall of the burner 2.
• the attachment 10 can be made for example by welding or soldering. Releasable connections between the longitudinal ribs 8 and the burner 2, for example by means of screws, are indeed possible, but not detachable connections are completely ausrechend, since the arrangement does not significantly restrict the access to the ignition electrodes 7 and therefore the ribs 8 need not be removed for access to the electrodes 7.
• the ribs 8 should be made of an impact resistant and rigid material such as e.g. Be made of steel.
• the distance of the ribs from the ignition electrodes 7 should be at least 5 mm at an ignition voltage of 5 kV, so that no flashover between a firing electrode and a rib can take place.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Gas Burners (AREA)
• Spark Plugs (AREA)
• Measuring Oxygen Concentration In Cells (AREA)
• Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

Family

ID=37606836

Family Applications (2)

Family Applications Before (1)

Country Status (11)

Families Citing this family (6)

Family Cites Families (22)

• 2006
  • 2006-08-23 EP EP06017534A patent/EP1892474A1/fr not_active Withdrawn
• 2007
  • 2007-08-14 US US12/310,284 patent/US8327616B2/en active Active
  • 2007-08-14 ES ES07788421T patent/ES2342500T3/es active Active
  • 2007-08-14 PT PT07788421T patent/PT2054669E/pt unknown
  • 2007-08-14 AT AT07788421T patent/ATE462933T1/de active
  • 2007-08-14 CN CN2007800289382A patent/CN101501401B/zh active Active
  • 2007-08-14 JP JP2009525023A patent/JP2010501767A/ja active Pending
  • 2007-08-14 EP EP07788421A patent/EP2054669B1/fr active Active
  • 2007-08-14 KR KR1020097005879A patent/KR101391212B1/ko active Active
  • 2007-08-14 WO PCT/EP2007/058411 patent/WO2008022948A1/fr not_active Ceased
  • 2007-08-14 RU RU2009110175/06A patent/RU2439433C2/ru active
  • 2007-08-14 DE DE502007003342T patent/DE502007003342D1/de active Active
• 2011
  • 2011-12-22 JP JP2011281519A patent/JP5484436B2/ja active Active

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events