Plant for the purification and processing of nitrous exhaust gases containing at least one additional acidic compound

摘要

Plant for cleaning and processing nitrous gases, in particular from pickling or etching processes, which contain at least one additional acidic component, consisting of at least three series-connected washing columns (K1, K2, K3) with a packed bed (FS), the washing columns (K1, K2, K3) are connected to one another via lines (2, 3) guided from the top (K) of one washing column to the bottom (KS) of the subsequent washing column, the first washing column (K1) having a line (1) for feeding the is connected to the cleaned exhaust gas stream, which is integrated below the packed bed (FS) in the wash column (K1), and each wash column (K1, K2, K3) is connected to a circuit line (KL1, KL2, KL3) as a wash water circuit, which is connected to the sump (KS) is led to the top (K) of the column, a pump (P1, P2, P3) in the respective circuit line and a heat exchanger (W1) for cooling the washing water in at least one of the circuit lines Solution are integrated, and a storage container (B2) for oxidizing agent is arranged, which ...