KBS Kokereibetriebsgesellschaft Schwelgern (Duisburg, Germany):

Liszio P., Dr. Eng., CEO

Steel Institute VDEh (Düsseldorf, Germany):

Lüngen H. B., Dr. Eng., Senior Manager Operation Unit Technology, hans-bogo.luengen@vdeh.de

Hüttenwerke Krupp Mannesmann GmbH (Duisburg, Germany):

Nelles L., Dr. Eng., Head of Coke dept.

The blast furnace/converter route will remain the dominant steelmaking process for a long time. Blast furnaces cannot be operated without coke for physical reasons. World crude steel production for 1970–2010, world hot metal, DRI/HBI production for 1950–2010 and world coke production for 1990–2011 are analyzed. Five most modern coke oven plants are operated in Germany, their parameters are presented.The coke oven plant Schwelgern, which was commissioned in 2003, has the largest coke oven chambers in the world. This plant demonstrates the peak of development for the conventional coke oven system. Process scheme, charge after 50% of coking time and cross section for such conventional coke ovens are displayed. Besides high-quality coke the conventional horizontal coke oven chambers supply high-energy gas for heating or for power production as well as by-products which are converted into useful products. Coke dry quenching facility of coke oven plant Kaiserstuhl is observed, as well as CSQ quenching car and quenching tower of coke oven plant Schwelgern and CSQ quenching machine at Hüttenwerke Krupp Mannesmann. Pushing and charging machine of the heat recovery coke oven plant Coqueria de Sol in Tubarao, Brazil, is shown. In comparison the heat recovery oven system, which is not used in Europe, produces coke and steam only. For selection of coal used in  the conventional coke oven system care has to be taken of avoiding too high a gas pressure during coking. Requirements on blast furnace coke properties in Germany is observed and CO₂ intensity of coke benchmarking curve is analyzed. Coke plant operators are today facing the challenge of a tighter coking coal market.

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