In the SCOPE21 pilot plant, it was verified whether the target of coke strength and coke mean size were attainable, when the proportion of poor coking coal in coal charge was 50%.
As a result of the tests, it was confirmed that DI¹⁵⁰₁₅ was improved by 2.5 compared with a conventional process, which was higher than the coke strength, 84, usable for blast furnaces. The improvement of DI¹⁵⁰₁₅ is thought to be due to the increase of bulk density of coal charge, coking property improvement of coals by rapid preheating of coals and homogenization effect of coke texture.
Moreover, it was confirmed that the appropriate coke mean size, 43 mm, was obtained by an anthracite addition even at the highest productivity (flue temperature: 1250°C) of the SCOPE21 process.