Investigations on removal of sulfuric acid aerosols by the WFGD and the WESP in the power plants were aimed at the control of sulfuric acid emission. The results showed that the improvement of the WFGD system was beneficial for the reduction of sulfuric acid emission, while the WESP system was essential to control the final sulfuric acid aerosol concentration.
The
fine particles in desulfurized flue gas comprise coal-fired
fine particles from combustion and generated fine particles from desulfurization.
The abatement of fine particle emission by heterogeneous vapor condensation
during wet flue gas desulfurization (WFGD) is experimentally investigated
in this paper. A supersaturation atmosphere, which is necessary for
heterogeneous vapor condensation, is established by increasing the
humidity and reducing the temperature of the flue gas before WFGD.
The improvement of the removal of coal-fired fine particles and the
inhibition of generated fine particles formation in desulfurization
process by heterogeneous vapor condensation were studied, and the
influences of inlet flue gas parameters on the emission of total fine
particles, including coal-fired fine particles and generated fine
particles during desulfurization, are examined. The results indicate
that the total emission of fine particles in desulfurized flue gas
can be significantly decreased via heterogeneous vapor condensation.
This decrease in the emission of coal-fired fine particles is mainly
related to the removal of fine particles via heterogeneous vapor condensation,
and the generation of fine particles from desulfurization is abated
because of both the decrease in the inlet flue gas temperature and
heterogeneous vapor condensation. Higher inlet flue gas humidity can
adequately reduce the emission of generated fine particles from desulfurization.
The reduction in the flue gas temperature before WFGD is the main
factor that inhibits the formation of fine particles and removes coal-fired
fine particles during desulfurization.
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