Fluidized Bed Combustion of Coal, Renewable Fuels, and Waste: Current Status and Developments - Novel Combustion Concepts for Sustainable Energy Development - page 233

rich of oxygen and CO 2 . Because of this technology, the flue gas is almost without

nitrogen and the CO 2 is not diluted with nitrogen as it normally combusts with
supplied air. These signi

fl

cantly help to remove the CO 2 . In Fig. 6 , the 30 MWth
demonstration CFB unit is shown.

4.3 Chemical-Looping Combustion (CLC) Using Fluidized

—

Bed Technology

With chemical-looping, it is not necessary to use oxygen. Air is used however not
to burn the fuel but to regenerate the metal oxide in the air reactor. The metal oxide
is oxidizing the fuel in the fuel reactor. Both reactors are coupled by the mass

fl ow

of the metal oxide but the off gases are separated out, see Fig. 7 .

Fig. 6 Scheme of the 30 MWth CFB demonstration unit for oxyfuel combustion (Tourunen 2013 )