Heavy Metal Behaviour During
RDF Gasification
Author(s)
G. Compagnone, P. De Filippis, M. Scarsella, N. Verdone
& M. Zeppieri
Abstract
Solid wastes, and especially RDF in dealing with the growing presence of
organic compounds, mainly plastics, can be considered an important source of
energy owing to their inexpensiveness and large availability. However, the
presence of heavy metals in the waste can result in a recycling problem when
thermal treatment is involved. In fact, small amounts of these metal species can
be found in the gaseous stream, and this is particularly true for gasification
processes. This work investigates the possibility of using theoretical calculations
to evaluate the amount of volatile metal species in the gas stream, obtained by a
gasification process, in order to select the adequate gas cleaning facilities. To this
aim, the chemistry and volatility of the heavy metals As, Cd, Cr, Cu, Hg, Mn, Ni,
Pb, Sb, Sn and Zn, commonly present in RDF, were investigated both
theoretically and experimentally at different gasification conditions. A
theoretical approach at equilibrium conditions based on thermodynamic data was
performed by means of the total Gibbs free energy minimization method. The
equilibrium distribution of the trace element species formed under reducing
conditions in the 700-1300 K temperature range was calculated. The theoretical
results are in substantial accordance with experimental data obtained using a
bench scale gasification reactor. This study demonstrates that is possible to
predict with reasonable conditions the operating conditions of a RDF gasifyier in
order to obtain a syngas with a controlled content of polluting compounds.
Keywords: gasification, RDF, trace metals, thermodynamic simulation.
Keywords
gasification, RDF, trace metals, thermodynamic simulation.
Related Book
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