Process of cleaning flue gases from heating plants, and a...

B - Operations – Transporting – 01 – D

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23/360, 165/4

B01D 53/14 (2006.01) B01D 53/60 (2006.01)

Patent

CA 1190381

Abstract: A Process of Cleaning Flue Gases From Heating Plants, and a Cleaning Plant for Carrying Out the Process. By a process of cleaning flue gases, both solid parti- cles and nitrogen oxides and sulphur dioxide are removed from the flue gas prior to the discharging into the atmospheric air. In order to ensure that almost all the content of sulphur dioxide and nitrogen oxides is re- moved from the flue gas, said flue gas is initially carried through a rain of aqueous liquid and subsequent- ly through a heat exchanger, in which its temperature is lowered to about 20-30°C, and then through a film of alkaline liquid, and finally through a second rain of aqueous liquid to pass a sulphuric acid neutralizing liquid in a container before the discharging into the atmospheric air. As a result a simultaneous possibility of utilizing the heat of the flue gas is ensured by means of the heat exchanger. A cleaning plant for car- rying out the process comprises an apparatus (2), through which the flue gas cleaned of solid particles is carried. When seen in the flow direction, this appa- ratus comprises a first flue scrubber (8), in which the flue gas is subjected to a rain of liquid, a two-step heat exchanger (9, 10) permitting a reduction of the temperature of the flue gas to 20-30°C. After the two- step heat exchanger (9, 10), the apparatus (2) com- prises a rotating, conical disc (11) providing a film of milk of lime, through which the flue gas is forced to pass during the continuous flow through the appara- tus. After this film of milk of lime, the flue gas passes a rain of liquid emitted from a second flue scrub- ber (14), and Upon said scrubber the flue gas is forced to pass a limy liquid in a container (15).

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