Our fluidized bed combustion (FBC) is a combustion technology used for burning renewable biomass green energy (i.e., wood and various biomass fuels) and traditional coals (lignite, sub-bituminous, bituminous and anthracite) along with various other fuels. The Moss fluidized bed combustion system utilizes bubbling fluidized bed technology where solid fuels are suspended on upward-blowing jets of air during the combustion process resulting in a turbulent mixing of gas and solids. This system allows for the VOC airstream to be disposed of in the bed material or over the bed in the overfire air system (flow rates and lbs. of material determine the final VOC system design).

The Moss fluidized bed packaged boiler design ranges in size from 20,000 - 75,000 lbs./hr. and semi-packaged and field erected systems up to 250,000 lbs./hr. with design pressures from 15 - 950 PSIG and superheated temperatures up to 950° F. Moss fluid bed systems are capable of burning dry or wet fuels making it particularly suitable for process load, co-generation and other industrial facility applications. These systems can be installed with watertube, hybrid and HRSG (heat recovery steam generator) boilers.

Fluidized Bed boiler systems offers the following features and benefits:

  • High Efficiency: FBC boilers can burn fuel with a combustion efficiency of over 95% irrespective of ash content. FBC boilers can operate with overall efficiency up to 84%.
  • Reduction in Boiler Size: High heat transfer rate over a small heat transfer area for tubes immersed in the bed result in overall size reduction of the boiler.
  • Fuel Flexibility: FBC boilers can be operated efficiently with a variety of fuels. Even fuels like flotation slimes, washer rejects, agro waste can be burnt efficiently. These can be fed either independently or in combination with coal into the same furnace. FBC boilers are capable of burning many difficult fuels in addition to wood, biomass, coal, corn products, municipal solid waste (MSW) and DDGS. Burns wet or dry fuels.
  • Ability to Burn Low Grade Fuel: FBC boilers would give the rated output even with inferior quality fuel. The boilers can fire coals with ash content as high as 62% and having calorific value as low as 2,500 kcal/kg. Even carbon content of only 1% by weight can sustain the fluidized bed combustion.
  • Ability to Burn Fines: Coal containing fines below 6 mm can be burnt efficiently in our FBC boiler, which is very difficult to achieve in conventional firing system.
  • Pollution Control: SO2 formations can be greatly minimized by the addition of limestone or dolomite as bed materials for high sulphur coals. 3% limestone is required for every 1% sulphur in the coal feed. Low combustion temperature eliminates thermal NOx formation. The FBC system provides the lowest emissions available for fuel burning combustion systems.
  • Low Corrosion and Erosion: The corrosion and erosion effects are less due to lower combustion temperature, softness of ash and low particle velocity (on the order of 3.2084 ft./second or 1 m/second).
  • Easier Ash Removal - No Clinker Formation: Since the temperature of the furnace is in the range of 1,382 - 1,652° F. (750 - 900o C.) in FBC boilers, even coal of low ash fusion temperature can be burnt without forming clinker formations. Ash removal is easier as the ash flows like liquid from the combustion chamber. Hence less manpower is required for ash handling.
  • Less Excess Air - Higher CO2 in Flue Gas: The CO2 in the flue gases will be on the order of 14 - 15% at full load. Hence, the FBC boiler can operate at low excess air - only 20 - 25% (approximately 4% oxygen).
  • Simple Operation, Quick Start-Up: High turbulence of the bed facilitates quick start up and shut down. Full automation of start up and operation using reliable equipment is possible.
  • User friendly PLC Control System: The Moss FBC control system is fully automatic and provides details of all phases of the operation.