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Exhaust Air and Exhaust Gas Cleaning

SCR Retrofit at the "Hermann Wenzel" Power Plant Unit III, Duisburg-Ruhrort

Exhaust Air and Gas Cleaning


SCR Retrofit at the "Hermann Wenzel"
Power Plant Unit III,


Technical Data Reference Sheet


thyssenkrupp Steel Europe AG operates the gas-fired "Hermann Wenzel" power plant with a total of four units at the Duisburg-Ruhrort location. Unit III is operated in mixed mode with blast furnace gas and coke oven gas. To match nitrogen oxide emissions requirements under the emission directives, a nitrogen oxide reduction system had to be retrofitted.



To reduce nitrogen emissions, an SCR system was retrofitted in Unit III. In addition to the integration of the new SCR reactor, the scope of supply included the reducing agent supply up to the injection into the flue gas path, including the associated piping, control and measurement technology.

The load transfer of the required catalyst layer should not be directly into the boiler shell. In order to ensure this, the load of the SCR in Unit III is transferred directly into the boiler steel structure by means of additional structures according to the current state of the art.  

Compliance with the required denitrification rate is achieved with only one layer of SCR catalyst. The catalyst level can be walked on.

The integration of the SCR system into the existing power plant boilers has worked flawlessly. The stricter emission values are reliably maintained.


For more information, please see our reference sheet.

"The purification of waste gases and process gases is increasingly becoming a core issue in the design of plants due to the increasing environmental requirements. With our processes, we can not only clean the gases, but also make the ingredients available for recycling."

Dr. Annette Ziemann-Nöthe

Deputy Head of Exhaust Air and 
Exhaust Gas Cleaning

Technical Data

Number of Lines


Flue Gas Volume

Mixed Mode282,000 Nm³/h

COG only319,000 Nm³/h

COG + BFG min BK2487,000 Nm³/h

NOx Crude Gas

Miced Mode600 mg/nM³

COG only750 mg/Nm³

COG + BFG min BK2265 mg/Nm³

NOx-Guaranty Value downstream KAT

dry, 11 % Vol% O2100 mg/Nm³


dry, 11 % Vol% O2< 5 mg/Nm³


Contact evaporator (steam operated)



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