Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
  • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
  • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
  • F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/46—Details
  • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/46—Details
  • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
  • F23D14/74—Preventing flame lift-off
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
  • F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
  • F23R3/16—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration with devices inside the flame tube or the combustion chamber to influence the air or gas flow
  • F23R3/18—Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2209/00—Safety arrangements
  • F23D2209/20—Flame lift-off / stability

Definitions

• each disclose coal fired burners that include a flame stabilizer for imparting a swirl to the fuel-air mixture.
• the disclosed flame stabilizers include a plurality of radially spaced- apart vane elements mounted on a ring member which is positioned over a central fuel supply tube. The vanes are shaped and oriented to provide swirled air to the downstream end of the fuel supply tube.
• U.S. Patent No. 5,477,685 to Samuelson which is herein incorporated by reference in its entirety, discloses a swirl stabilized, lean burn injector for a gas turbine combustor.
• a fuel-air mixture exits a centrally positioned nozzle through a plurality of radially-oriented exit ports.
• the length of the recirculation zone is less sensitive to the swirl number and assumes a length of about 2 to about 2.5 times the quarl exit diameter.
• a quarl allows for a high S n to be used without producing a large diameter recirculation zone.
• the swirl strength when the swirl strength is strong, the flame has a tendency to move upstream, deep inside the burner causing damage to the burner components.
• making the mixture richer increases the flame speed. This increase in flame speed causes the flame to travel further upstream into the burner. In addition to damaging the burner hardware, the uncontrolled movement of flame deep into the burner can result in high NOx emissions.
• the swirl number is defined as the ratio of the amount of rotating combustion air going through the burner versus the amount of the combustion air exiting the burner is in an axial flow condition.
• Burner 100 is adapted for making the cyclic combustion process more stable and significantly reduces the tendency for a gas turbine engine using a lean premixed combustion to flame out or to produce pressure pulsations resulting from unstable combustion.
• the center body flame holder 20 and the quarl 80 have two key effects: 1) the point where combustion is initiated is fixed in space, and 2) higher swirl velocities can be obtained without combustion to flash back into the mixing chamber 50 of the burner 100.
• burner 100 The upstream and downstream ends of burner 100 are identified by reference character "U" and "D", respectively.
• the flow of combustion products is separated into distinct zones, namely a main recirculation zone 90 and an outer recirculation zone 92.
• the process of swirling the fuel-air mixture so as to cause the combustion products to travel upstream is commonly used to stabilize combustion.
• the bluff body flame holder 20 anchors the main re-circulation zone 90 into a fixed position.
• the flame front or combustion initiation point 94 of the premixed flow occurs along the outer surface of the main re-circulation zone 90 where the heat and free radicals mix and initiate combustion of the unreacted premixed fuel and air.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=34519984

Family Applications (1)

Country Status (9)

Families Citing this family (37)

Family Cites Families (38)

• 2004
  • 2004-09-03 US US10/933,887 patent/US20050106520A1/en not_active Abandoned
  • 2004-09-03 JP JP2006525479A patent/JP4767851B2/ja not_active Expired - Fee Related
  • 2004-09-03 WO PCT/US2004/028768 patent/WO2005040682A2/en not_active Ceased
  • 2004-09-03 CN CN2004800328006A patent/CN1878986B/zh not_active Expired - Fee Related
  • 2004-09-03 RU RU2006110986/06A patent/RU2407950C2/ru not_active IP Right Cessation
  • 2004-09-03 BR BRPI0413966-6A patent/BRPI0413966A/pt not_active Application Discontinuation
  • 2004-09-03 CA CA2537949A patent/CA2537949C/en not_active Expired - Fee Related
  • 2004-09-03 EP EP04809669A patent/EP1668295A2/en not_active Withdrawn
  • 2004-09-03 KR KR1020067004626A patent/KR101178195B1/ko not_active Expired - Fee Related

Non-Patent Citations (1)

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