TUYERE LEVEL COKE CHARACTERISTICS IN BLAST-FURNACE WITH PULVERIZED COAL INJECTION

Coke in the blast furnace experiences great changes in their propertie s during the blast furnace operation. Pulverized coal injection (PCI) into the blast furnace through tuyeres together with oxygen enrichment affects coke properties and blast furnace operation. Using coke sampl er at tuyere level, coke samples were collected and analysed at variou s coal injection rates in the both conventional and co-axial oxygen en richment. With the help of information obtained from coke sampling res ults, it is known that alkali affects the coke properties, CSR' and CR R', in bird's nest and deadman but, in bosh and raceway, DI' of the co ke is varied with the operation conditions. Also, it is found that gas permeability resistance index in lower part of blast furnace (LK) and mean size of coke at tuyere level were predicted and matched well wit h the measurements.