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专利名称：METHOD FOR CLEANING AND
REPROCESSING EXHAUST GASESCONTAINING NITROGEN OXIDES ANDCONTAINING AT LEAST ONE ADDITIONALACIDIC COMPOUND
发明人：GUENTHER, LOTHAR申请号：EP11796911.3申请日：20110811公开号：EP2603306A1公开日：20130619
摘要：The invention relates to a method for cleaning and reprocessing exhaust gasescontaining nitrogen oxides and containing at least one additional acidic compound, suchas hydrofluoric acid, sulfur oxides, hydrochloric acid, or phosphoric acid, individually or incombination. In view of the disadvantages of the known prior art, a method should beprovided, by means of which an exhaust gas of high purity and a mixed acid, which can bereused directly for pickling or etching, are obtained. For this purpose, the followingmethod is proposed: incrementally, in at least three scrubbing stages, the exhaust gas isbrought in contact, in counterflow, with water as a scrubbing solution having a
temperature of 5 to 30°C while an oxidant is added, by means of scrubber columns K1, K2,K3 that are connected in series and that have a packed bed FS having a surface of 180 to980 m/m and that have a loading rate per unit volume of 30 to 180 m3/m3h per scrubbercolumn. In the first scrubbing stage K1, at least 60% of the NO components contained inthe exhaust gas and 90% of the further acidic components contained in the exhaust gas
are scrubbed out. The scrubbing circuit is run until a concentration ratio of the mixed acidor dilute acid in the sequence K1:K2:K3 of 500:50:5 to 500:10:0.2 develops in the columnbottoms KS of the scrubber columns K1, K2, K3. Immediately afterward, mixed acid isremoved from the circuit from the first column K1 and then dilute acid is re-dosedsuccessively from the second column K2 to the first column K1 and from the third columnK3 to the second column K2 and water is supplied to the third column K3 as
compensation. The loading rate per unit volume of the individual scrubber columns K1,K2, K3 among each other is set in such a way that the ratio of the loading rate per unitvolume of the first scrubber column K1 to the loading rates per unit volume of thesubsequent scrubber columns K2, K3 as a sum is 1:1.5 to 1:10.
申请人：DGE DR.-ING. GUENTHER ENGINEERING GMBH
地址：Dessauer Strasse 6a 06886 Wittenberg DE
国籍：DE
代理机构：Tragsdorf, Bodo
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