METHOD FOR REMOVING SO FROM EXHAUST GASES EMITTED FROM A STEAM BOILER Russian patent published in 2016 - IPC B01D53/14 C01B17/00 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of removing SO_x from exhaust gases. Method of removing SO_x from exhaust gases emitted from a steam boiler comprises the following steps: (a) heating exhaust gas in front of a catalytic reactor in the flow direction; (b) oxidation of SO₂ in exhaust gas to SO₃ in the catalytic reactor with at least one transmission of the catalyst acting at temperatures within the range of 350-450 °C; (c) cooling oxidised enriched SO₃ of exhaust gas from step (b) to temperature higher than a dew point H₂SO₄ of exhaust gas; (d) further cooling enriched SO₃ of exhaust gas from step (c) in air cooled capacitor, thus, SO₃ is condensed in the form of H₂SO₄ and hot air and purified exhaust gas are produced; (e) removing condensed H₂SO₄ from the condenser. Exhaust gas temperature at step (c) is controlled by cooling exhaust gas in heat exchanger by heat exchange with water flow at pressure higher than 60 bar, and in which water temperature under pressure at inlet of the heat exchanger is higher than a dew point H₂SO₄ of gas.

EFFECT: invention provides simplified removing SO_x from exhaust gas.

9 cl, 7 tbl, 3 dwg