The Ecotube System
SOx reduction
With the Ecotube SOx reduction technology a dry sorbent is injected via the
Ecotube System into the upper part of the furnace to
react with the SO2 in the flue gas.
A finely grained sorbent for example Limestone is distributed
quickly and evenly over the entire cross section in
the upper part of the furnace in a location where the
temperature is in the range of 750-1,250°C. Limestone
(CaCO3) or hydrated lime (Ca(OH)2) can be used as sorbent.
The sorbent reacts with SO2 and O2 to form CaSO4. This
is later captured in a fabric filter or ESP together
with unused sorbent and fly ash. As with NOx reduction
technology systems, reduction rates ultimately depend
on an even distribution of the sorbent in the flue gas
in combination with proper mixing together with the
flue gases. Reaction times for SOx reduction are 1-2
seconds. The Ecotube SOx reduction technology can be
implemented on different boiler elevations to deal with
part load conditions.
Removal efficiency is greatly improved compared to
traditional wall injection systems due to better mixing
and better penetration of the solvent. Fine sorbent
particle size and an even distribution of the sorbent
over the cross-section of a boiler significantly improves
the process performance.
