The growing problem related to municipal
solid waste generation
has encouraged the development of alternative paths to convert waste
to energy. Among the different options, gasification has been proposed
as an interesting and efficient technology. In this study the influence
of equivalence ratio (ER) and temperature on the performance of the
air-gasification process during the gasification of a SRF material
has been evaluated. One of the parameters to assess the gasification
performance was the tracking of the evolution of some minor contaminants
present in the syngas (tar and N, S, and Cl compounds). The results
suggest that gasification temperatures around 800–850 °C
and ER on the order of 0.30–0.35 could be appropriate conditions
during SRF gasification aiming for tar and trace contaminants abatement
without compromising to a large extent other gasification performance
parameters.
The goal of this study is to assess
the release of contaminants
during the oxygen/steam gasification of two waste-derived fuels using
three different bed materials. The solid recovered fuels (SRFs) were
tested at 850 °C in a bench-scale fluidized-bed reactor with
sand, dolomite, and olivine as bed materials. The effects of the experimental
conditions were assessed based on the gasification performance (product
yields, carbon conversion, etc.) and the presence of tar, including
polycyclic aromatic hydrocarbons (PAHs) and minor contaminants (HCl,
H2S, HCN, and NH3) in the producer gas. The
results show higher gas yields with the use of catalysts, particularly
dolomite, and a lower catalytic activity of olivine toward tar abatement.
The presence of contaminant precursors (Cl, S, and N) together with
the concentration of metals from both catalysts and waste fuel ashes
appear to influence the evolution of contaminants. In general, dolomite
is more efficient than olivine in reducing tar compounds and most
minor contaminants but NH3, whereas olivine mainly exhibits
the ability to reduce light PAHs and nitrogenous compounds (HCN and
NH3) in the producer gas.
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