4. The combination of a separate biomass gasifier with a
coal-fired power station is currently realized in the power
station at Zeltweg, Austria (137 MWe). The biomass is
gasified in an externally circulating fluidized bed and the
energy-rich gas is supplied to the combustion chamber of
the power station. The advantage of such a combination
is that for re-burning in the combustion chamber the gas
need not be so clean, i.e. free from dust and tars, as it is
necessary for combined processes with gas turbines