Blast furnace coke represent the largest (~70%) share in total amount of world coke production. The most important indicators that evaluates for many years coke usability for blast furnace process are reactivity to carbon dioxide (CRI) and coke strength after reaction (CSR). The method for CRI/CSR indices test was developed by Nippon Steel Corporation (NSC) and until now, has been internationally recognized as the most reliable method for determination high temperature properties of coke. The NSC test simulates coke lumps transformation that occurs in blast furnace under high-temperatures conditions in which carbon dioxide coke gasification is main factor responsible for its grains degradation. Coke reactivity to carbon dioxide (CRI) determines percent weight loss of coke, as a result of carbon dioxide action on the coke sample in temperature 1100°C. The coke strength after reaction (CSR) determines >10 mm grain amount yield obtained after mechanical tumbling of coke after reaction with carbon dioxide. The main factors influencing coke CRI/CSR indices values are coal properties like: rank, petrographic composition of coal, plastometric  properties, content of ash and its composition.

In Department of Cokemaking Technologies of Institute for Chemical Processing of Coal  from many years works associated with determination of CRI/CSR indicators are conducted in accordance with three standards: ISO 18894, ASTM D5341, PN-C-04312. These analysis are the scope of IChPW laboratories accreditation (AB 081) issued by Polish Centre of Accreditation.

Device for determination of coke reactivity and strength after reaction by Institute

Device for determination of coke reactivity and strength after reaction by Institute

Institute for Chemical Processing of Coal is also the manufacturer of device for determination of coke reactivity and strength after reaction. The first device was designed and produced in 90’s of the 20th century and was successfully introduced for laboratory practice mainly in coking plants. The device is indispensable tool for research and development works and services in the field of cokemaking. Based on our experience and device users there was developed a new version. It introduces a significant changes for staff work safety and ergonomics.

Research and expertise in the scope of coal evaluation coking process and coke quality testing are conducted in Department of Cokemaking Technologies (Head of Department: PhD Bartosz Mertas, bmertas@ichpw.pl)

Author: Magdalena Winkler
Department of Cokemaking Technologies
contact: mwinkler@ichpw.pl | phone: 48 32 621 62 26