Simultaneous SO2 and NOx scrubbing downstream of combustion plants with simultaneous stabilization of the iron salt complexes in the scrubbing solution

摘要

In the main application P 3514407.6, it is proposed that, to stabilize the scrubbing liquid, a masking agent for masking the ironII ions and a reducing agent for reducing oxidized ironIII ions to ironII, by feeding suitable reducing agents into the scrubbing liquid, are created. According to the invention it has now been found that, to stabilize the ironII ions, carbon dioxide is introduced into the scrubbing liquid so that the Fe(II) is stabilized against oxygen attack by the carbon dioxide added according to the invention.