At present, most large coal-fired power plants are equipped
with wet flue gas desulfurization (WFGD) systems downstream
to an electrostatic precipitator. As the scrubbing effects of reagent
solution, particulate matter can be removed simultaneously in a
WFGD system. In the wet FGD process, the hot flue gas contacts
normal temperature scrubbing liquid. Simultaneous mass and energy
transfer takes place, causing the gas phase temperature to decrease
and the liquid phase to evaporate, entering the gas phase.
Consequently, the relative humidity of flue gas can be greatly
raised, allowing the flue gas after scrubbing approaches to be saturated
with water vapor at a temperature of about 45–60 C. Thus it is possible to produce a supersaturated vapor phase by improving
the operating conditions of the WFGD system [14,15]. Therefore,
a novel process combining heterogeneous condensation of
water vapor and WFGD system to separate fine particles from flue
gas is presented in this paper. Supersaturation was achieved by
means of adding steam into the particle growth region, which
was above the liquid phase inlet in the desulfurization tower.
The condensation grown droplets are effectively removed by a wire
mesh demister. The influences of the initial particle number concentration,
temperature of inlet flue gas and desulfurization solution,
amount of steam added, etc. on the removal efficiency were
experimentally investigated.
At present, most large coal-fired power plants are equipped
with wet flue gas desulfurization (WFGD) systems downstream
to an electrostatic precipitator. As the scrubbing effects of reagent
solution, particulate matter can be removed simultaneously in a
WFGD system. In the wet FGD process, the hot flue gas contacts
normal temperature scrubbing liquid. Simultaneous mass and energy
transfer takes place, causing the gas phase temperature to decrease
and the liquid phase to evaporate, entering the gas phase.
Consequently, the relative humidity of flue gas can be greatly
raised, allowing the flue gas after scrubbing approaches to be saturated
with water vapor at a temperature of about 45–60 C. Thus it is possible to produce a supersaturated vapor phase by improving
the operating conditions of the WFGD system [14,15]. Therefore,
a novel process combining heterogeneous condensation of
water vapor and WFGD system to separate fine particles from flue
gas is presented in this paper. Supersaturation was achieved by
means of adding steam into the particle growth region, which
was above the liquid phase inlet in the desulfurization tower.
The condensation grown droplets are effectively removed by a wire
mesh demister. The influences of the initial particle number concentration,
temperature of inlet flue gas and desulfurization solution,
amount of steam added, etc. on the removal efficiency were
experimentally investigated.
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