Process for controlling the concentration in the absorption tower

摘要

The invention relates to a process for controlling the concentration of the suspension in the absorption tower, in which SO2-containing exhaust gas is brought into contact with a suspended Ca-compound-containing suspension in order to absorb the SO2 and is characterised in that the suspension is withdrawn from the absorption tower in such a manner that a division of the suspension into at least two groups having different concentrations results, of which one group is a suspension which has a higher concentration of the Ca compound and in that the withdrawal rates of the suspensions which are withdrawn from the tower are regulated, the concentration of the Ca compound in the suspension which is brought into contact with the exhaust gas being kept in a predetermined range. <IMAGE>