| Summary: | 碩士 === 國立中山大學 === 環境工程研究所 === 84 === This study investigated the potential removal of acidic gases
(SO2 and NO) from combustion waste gas by in duct dry sorbent
injection. A laboratory-scale dry sorbent injection duct
reactor was originally designed and constructed in this
study. The experiments were conducted by the injection of
hydraded lime (Ca(OH)2) and the humidification of flue gas
with water spray at the downstream of dry sorbent injection
port. The atomization of water into duct reactor is two fold.
First, it elevates the rela humidity of waste gas to enhance
gas-solid reaction rate. Second, the dry sorbent may collapses
with water droplet to form an alkiline slurry droplet which
acts as a spray drying process. The acidic gases were removal
during the complex gas-solid and gas-liquid chemical
reactions. Before the experiments were conducted,
experimental apparatus were initially characterized by leakage
and adiabatic tests. The main work of this study was to detect
the acidic gas removal efficiency and sorbent conversion. The
operation parameters investigated were stoichiometric ratio
(SR), approach to adiabatic saturation temperature (AT) and
inlet acidic gas concentration. Finally, the reaction product
of in-duct dry sorbent injection was photographed by canning
electron microscope (SEM) e it''s size and morphology. For the
experiments conducted in the in-duct dry sorbent injection, the
removal efficiencies of SO2 were 20%~57% and those of NO were
5%~9% at a stoichiometric ratio of 0.5~3.0 and an approach to
saturation temperature of 10℃. In the simultaneous removal
tests of SO2 and NO, the removal efficiency of SO2 was higher
than that of SO2 single gas test, but NO removal efficiency
was somewhat lower than that of NO single gas test. As the
ratio of SO2 to NO concentration increases, the SO2 removal
efficiency creases, and NO removal efficiency increases
slightly. In addition, an irregular shape of product was
observed by SEM in the dry sorbent injection.
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