Case study
For a recent biomass proposal opportunity, the project
developer specified fluidized-bed combustion, but left the
technology choice (CFB or BFB) to the boiler manufacturer.
The fuel was defined as a typical woody biomass, with a
35 to 55% moisture range. Since uncontrolled emissions
such as NOx and SO2 can be lower in a CFB, the preferred
technology was not obvious. Ultimately the correct decision
went beyond the boiler; i.e., uncontrolled emissions,
to include the air quality control system (AQCS) necessary
to meet specified controlled emissions targets. This led to
the development of two complete “chute-to-stack” systems,
and evaluating the merits of each.