Practice of the application of lean coal to coal injection in large-scale blast furnaces

摘要

This study mainly introduces the technical properties of a kind of lean coal mined from Lu'an,a prefecture of Shanxi Province and its application to coal injection in large-scale blast furnaces(BFs)in Baosteel.China is rich in lean coal resources.The technical properties of lean coal,including ash content,sulfur content and caloricity,etc.,are similar to those of anthracite coal used in Baosteel,except the fact that the volatile of lean coal is higher.Besides,the explosive property and the coking property of lean coal are suitable for the BF coal injection.In this study,lean coal was tested in the pulverized coal injection(PCI)of a BF.In the test,the blending proportion of lean coal in the coal blend was increased gradually,and the consequential production indexes were traced.All the operational indexes show that the results of the BF coal injection are good,demonstrating that lean coal can be substituted for anthracite coal in the PCI in BFs.With an abundant amount and specific utilization,lean coal is found to be of a high economic value.