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Power Generation and Gasification

Circulating Fluidized Bed (CFB) Combustors utilize a fluidized bed within the furnace to provide numerous advantages, including extremely low NOx emissions, flex fuel capabilities, plus the addition of limestone particulates can capture 98% of the sulfur. Barracuda has been used to successfully understand complex furnace behavior such as fuel-air residence times, solids recirculation and bed mixing problems, bed entrainment rates and local wear.  A CFB unit's large cyclone can be grade-optimized; and the loop seal upset behavior can be mitigated.

Gasification of coal and/or biomass material produces 'syngas' CO and H2 for fuel or chemical plant feedstock. Barracuda is being used today to study gas-solids phenomena inside an experimental combustors and gasifiers at DOE's National Energy Technology Laboratory.  It is also being applied to commercial deepbed gasifiers with a static bed height of over 30 meters of coke.  TRI, Inc. uses Barracuda for a state-of-the-art biomass thermochemical conversion design employing sand as the heat transfer medium with MSW or bioparticles, thus a multi-particle formulation is required.

Barracuda's Chemical Reactions module quantifies the production yields along with an accurate tally of solids consumption; the reactions automatically results in particulate size reduction which effects fluidization and elutriation rates.

Plant Components→ Issues

  • Furnace geometry →  optimize fuel/air mixing
  • Cyclones →  efficiency and reliability
  • Loop Seal → aeration / plugging / clearing
  • Feedline / Valves / Withdrawal →  location, wear, number
  • Combustor Startup →  full loop performance
  • Economics → conversion, yields

Plant Phenomena

  • Fluid bed expansion / density
  • Bed carryover (entrainment) rate & PSD
  • Segregation / recirc of size/materials (ash)
  • Incomplete Combustion
  • Stability, startup, off-normal transient behavior

Click here to download more information on CFB Combusters

Click here to download more information on Gasifiers