SUMMARY
A comprehensive computer simulation program that
can deal with a wide range of different operating
conditions in fluidized bed combustion and gasification has
been developed.
It includes the possibility of simulating
operations with various types of coal, charcoal or wood and
can predict the behaviour of a real unit by giving several
important performance parameters, such as:
(a) Emulsion and bubble gas composition profiles throughout
the bed height. The components included are: CO2 , CO, 02,
N 2 , H2 0, H2 , CH4 , SO2 , NO, C2 H 6 , H2 S, NH3 and Tar.
(b) Gas phase composition throughout the freeboard height.
(c) Solid compositions of the coal (or any other
carbonaceous material), limestone and inert in the bed and
throughout the freeboard. The considered components are: C,
H, 0, N, S, ash, volatiles, moisture in the coal, CaCO3,
CaO, CaSO4 , moisture in the limestone, Si0 2 , and moisture
in the inert.
(d) Temperature profiles of all phases throughout the bed
and the freeboard.
(e) Solid particle size distributions in the bed and in the
freeboard sections. The considered effects are:
elutriation, entrainment, attrition and recycling in all
the three possible types of solid phases present;
(f) Heat transfered to water/steam inside the tubes, steam
production and tube surface temperatures in the case of
boiler simulation.