A novel process to remove fine particles with high efficiency by heterogeneous condensation in a wet
flue gas desulfurization (WFGD) system is presented. A supersaturated vapor phase, necessary for condensational
growth of fine particles, was achieved in the SO2 absorption zone and at the top of the
wet FGD scrubber by adding steam in the gas inlet and above the scrubbing liquid inlet of the scrubber,
respectively. The condensational grown droplets were then removed by the scrubbing liquid and
a high-efficiency demister. The results show that the effectiveness of the WFGD system for removal of
fine particles is related to the SO2 absorbent employed. When using CaCO3 and NH3·H2O to remove SO2
from flue gas, the fine particle removal efficiencies are lower than those for Na2CO3 and water, and the
morphology and elemental composition of fine particles are changed. This effect can be attributed to the
formation of aerosol particles in the limestone and ammonia-based FGD processes. The performance of
the WFGD system for removal of fine particles can be significantly improved for both steam addition
cases, for which the removal efficiency increases with increasing amount of added steam. A high liquid
to gas ratio is beneficial for efficient removal of fine particles by heterogeneous condensation of water
vapor.
A novel process to remove fine particles with high efficiency by heterogeneous condensation in a wet
flue gas desulfurization (WFGD) system is presented. A supersaturated vapor phase, necessary for condensational
growth of fine particles, was achieved in the SO2 absorption zone and at the top of the
wet FGD scrubber by adding steam in the gas inlet and above the scrubbing liquid inlet of the scrubber,
respectively. The condensational grown droplets were then removed by the scrubbing liquid and
a high-efficiency demister. The results show that the effectiveness of the WFGD system for removal of
fine particles is related to the SO2 absorbent employed. When using CaCO3 and NH3·H2O to remove SO2
from flue gas, the fine particle removal efficiencies are lower than those for Na2CO3 and water, and the
morphology and elemental composition of fine particles are changed. This effect can be attributed to the
formation of aerosol particles in the limestone and ammonia-based FGD processes. The performance of
the WFGD system for removal of fine particles can be significantly improved for both steam addition
cases, for which the removal efficiency increases with increasing amount of added steam. A high liquid
to gas ratio is beneficial for efficient removal of fine particles by heterogeneous condensation of water
vapor.
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