Pilot-Scale Exhaust Gas Treatment for a Glass Manufacturing System Using a Plasma Combined Semi-dry Chemical Process

A pilot-scale simultaneous removal of NOW and SO
_x
, as a nonthermal plasma and chemical hybrid process (PCHP), is carried out on combustion exhaust gas in a glass manufacturing system. The PCHP is implemented in an actual semi-dry-type exhaust gas treatment system. The exhaust gas (12 700 m
³
N/h) is produced by the combustion of fossil fuels and contains both NO
_x
(160 ppm) and SOW (150 ppm). In PCHP, NO is oxidized to water-soluble NO
₂
through a plasma process using ozone. Na
₂
SO
₃
is then produced as a byproduct in a desulfurizing process using a solution of NaOH. The generated NO
₂
is then reduced to N
₂
and Na
₂
SO
₄
using an Na
₂
SO
₃
solution, followed by the dried Na
₂
SO
₄
particles being removed in a semi-dry reactor by a dry-type electrostatic precipitator. Our findings show the molar ratio of NO to the injected ozone to be more than 0.75. NO and SOW removal efficiencies of 28% and 63% are obtained. Further, the paper discusses de-NO
_x
by the use of a bag filter (BF) for the injection of the NaHCO
₃
at the BF inlet. Due to the effect of ozone and NaHCO
₃
, NO
_x
removal efficiency is increased by up to 45%. Our results show that higher de-NO
_x
and de-SO
_x
efficiencies are obtained by maintaining a local exhaust gas temperature of less than 150 °C. Through this experiment, it is confirmed that this simultaneous treatment of NO
_x
and SO
_x
using semi-dry-type PCHP is highly effective and promising for exhaust gas treatment in glass manufacturing.