TY - JOUR
T1 - Emissions and removal of gaseous pollutants from the top-gas of a blast furnace
AU - Lanzerstorfer, Christof
AU - Preitschopf, Wilfried
AU - Neuhold, Robert
AU - Feilmayr, Christoph
N1 - Publisher Copyright:
© 2019 ISIJ
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/3
Y1 - 2019/3
N2 - The emissions of a blast furnace and the separation efficiency of the top-gas scrubber were investigated for the gaseous components HCl, H 2 S, SO 2 , COS, CS 2 , CH 3 SH, HCN and NH 3 . The clean gas emission of sulphur was dominated by COS which accounted for about 85% of the total sulphur emissions. From the hydrogen halides only HCl was present above the detection limit and the concentrations of NH 3 and HCN were also low. The average separation efficiency for HCl, SO 2 and NH 3 was 96%, 81% and 46%, respectively. COS was not separated in the scrubber system. The concentrations of the weak acids HCN and H 2 S were higher in the off-gas after the scrubber compared to the concentration before the scrubber. This phenomenon was explained by the release from the scrubber water into the gas of un-dissociated H 2 S and HCN originating from cyanides and sulphides contained in the separated dust. Separation efficiencies similar to those of the scrubber system are expected to be achieved also by dry sorption gas cleaning processes. However, this has to be verified in experiments. In the case of applying a dry gas cleaning system, the concentrations of H 2 S and HCN in the clean gas would be even less.
AB - The emissions of a blast furnace and the separation efficiency of the top-gas scrubber were investigated for the gaseous components HCl, H 2 S, SO 2 , COS, CS 2 , CH 3 SH, HCN and NH 3 . The clean gas emission of sulphur was dominated by COS which accounted for about 85% of the total sulphur emissions. From the hydrogen halides only HCl was present above the detection limit and the concentrations of NH 3 and HCN were also low. The average separation efficiency for HCl, SO 2 and NH 3 was 96%, 81% and 46%, respectively. COS was not separated in the scrubber system. The concentrations of the weak acids HCN and H 2 S were higher in the off-gas after the scrubber compared to the concentration before the scrubber. This phenomenon was explained by the release from the scrubber water into the gas of un-dissociated H 2 S and HCN originating from cyanides and sulphides contained in the separated dust. Separation efficiencies similar to those of the scrubber system are expected to be achieved also by dry sorption gas cleaning processes. However, this has to be verified in experiments. In the case of applying a dry gas cleaning system, the concentrations of H 2 S and HCN in the clean gas would be even less.
KW - Blast furnace
KW - Gas cleaning
KW - Hydrogen cyanide emission
KW - Hydrogen sulphide emission
UR - http://www.scopus.com/inward/record.url?scp=85063935552&partnerID=8YFLogxK
U2 - 10.2355/isijinternational.ISIJINT-2018-591
DO - 10.2355/isijinternational.ISIJINT-2018-591
M3 - Article
SN - 0915-1559
VL - 59
SP - 590
EP - 595
JO - ISIJ International
JF - ISIJ International
IS - 3
ER -