Process for treating combustion residues from an incinerator, in particular a waste incinerator

摘要

Of the in a combustion plant (41) resulting solids, slag and ash alkalinity is to be utilized for the flue-gas wet wash, while improving the disposability and the basic flue gas scrubbing stage. To this end, the washing water is from the basin (B) a flue-gas wet wash (45) withdrawn for SO₂ to be used for separately washing of slag and ashes in, for example, stirred tanks (A ', A). Subsequently, the slag is in a screen (D) separated according to grain size and the fine fraction together with the ashes of a dewatering stage (C) supplied to go out of it to a stirred tank (H), to meet with the wash water from the tank (I) a flue-gas wet wash to be washed for HCl again. In a subsequent Nachwaschstufe (M), the solids of chlorides are freed. The wash water from the drainage stage (C) is the basin is recycled (B), while the wash water from the settling tank (H) of the basin (I) is recycled. For the deposition of mercury and other heavy metals additional stages (K, L) are provided.