The combustion on a fluidized bed is actually one of the most promising options
for energetic transformation because it allows the combination of the highly efficient
combustion of poor quality combustibles with the production in small quantities of
sulphur oxides (SOX) and nitrogen oxide (NOX). (RNC)
The boilers with compact fluidized beds represent the most advanced technologies in biomass
combustion. These boilers operate with a bed of inert matter (mostly sand composites, cilice
and ashes originating from the biomass in suspension in the combustion air) found at the base
of a flat bottom boiler. The typical temperature of operation for a fluidized bed is 760°C to
870°C (1400°F to 1600°F). With this type of boiler, we can burn combustibles with a high content
of ash and moisture. The amount of mud issued from the production processes that can be added to
a fluidized bed boiler is much greater then that which can be added to a boiler with a grate stoker.
Bubbling fluidized bed
In a boiler with a sandy fluidized bed, air is injected at the base of the boiler to fluidize the bed,
whose surface may rise up to 1 to 1.2m (3 to 4 feet). The size of the particles is 1000 to 1200µm and the
speed at which the air goes through the bed is 2.4 to 3 m/sec (8 to 10 feet/sec.).
You can take a look at one of our fluidized bed in action :
