Process and an apparatus for desulfurization of flue gases

B - Operations – Transporting – 01 – D

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B01D 53/34 (2006.01) B01D 53/50 (2006.01) B01D 53/73 (2006.01) B01J 10/00 (2006.01)

Patent

CA 2056123

Abstract Process and apparatus for removal of sulfur oxides from flue gases. In the process, a NaOH solution is injected into flue gases containing calcium oxide so that the formed reaction products are discharged from the reactor in a dry dust-like form together with the flue gases, whereafter the solids present in the flue gases are separated from the flue gases, mixed with water and sodium so as to form a sodium hydroxide solution wherefrom the other reaction products in solid form can be removed, the sodium hydroxide solution being returned to the flue gases. The apparatus comprises a desulfurization reactor (3) wherein a sodium hydroxide solution is injected into the flue gases, and an electrostatic precipitator (5) wherein the dust-like solids are separated from the flue gases. The apparatus further comprises a mixing reactor wherein the solids are mixed with water and additional sodium, and a filter (10) wherein the solids produced in the reaction are separated from the formed NaOH solution which is returned to a nozzle (11a) for injection into the reactor (3). (Figure 1)

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