METHOD AND APPARATUS FOR THE CLEANING OF FLUE GAS AND THE RECOVERY OF HEAT FROM SAME

摘要

With the method and the apparatus for the cleaning of flue gas from a boiler, and the recovery of heat from said gas, the flue gas is led from the boiler through a heat exchanger in such a manner that it still has a temperature above the acid dew point. The flue gas is then led to a scrubber tower (ST) and is washed with a scrubber fluid from a sedimentation tank (75). The pH value of the scrubber fluid is measured with a measuring element (80), in that a liquid additive base is introduced from a tank (47). The sediment in the sedimentation tank (75) is fed into a high-speed reactor (30), from which a basic fluid is led to one or more collection vessels (40). These collection vessels (40) are supplied with clean gas from the chimney (S) via a blower (45). This results in the formation of CaCO3 which, not being easily dissolved, is precipitated. The cleaned base is fed to the tank (47). The high-speed reactor (30) is supplied with lime water through a ring main (RL) and a dosing pump (18) from a lime water plant.