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Flue gas dewhitening technology (technology to eliminate white plume in flue gas after wet desulfurization)
In the wet desulfurization process, due to the high temperature of the flue gas entering the wet desulfurization tower, the heat will evaporate the moisture in the desulfurization slurry, and the wet flue gas after the wet desulfurization will be directly emitted. It is because in the desulfurization process, the temperature of the flue gas entering the wet desulfurization tower is high, and the desulfurization slurry directly contacts the high temperature flue gas, and heat and mass transfer occurs. On the one hand, moisture evaporates, increasing the moisture content of the flue gas, which is finally discharged into the atmosphere as the flue gas is lost, and on the other hand, the temperature of the flue gas is reduced, and the ability of the flue gas to carry water vapor is reduced. When the smoke reaches saturation, it will carry some small droplets. After removing most of the droplets of the saturated wet flue gas with small droplets, if the diameter is discharged into the atmosphere through the chimney, the moisture in the saturated wet flue gas will condense as the ambient temperature is lower than the flue gas temperature. The small droplets form a "white plume." The lower the ambient temperature, the higher the ambient humidity, and the longer the white plume.
Therefore, the temperature of 45-55 ℃ flue gas after desulfurization to 70-80 ℃ can be eliminated by the equipment, which can eliminate white plume. The specific heating temperature is related to the ambient temperature, the ambient humidity, the temperature of the wet flue gas at the desulphurization outlet, and the humidity of the wet flue gas, and needs to be determined according to the actual situation.