Strength Estimation of Bosh Coke Based on BF Conditions and Coke Quality

摘要

It is well known that a rise in the Pulverized Coal Injection Rate (PCR) will have more possibility in decreasing the coke rate in a Blast Furnace (BF). However, it also leads to the increase of coke abrasion. Insufficient coke strength will generate more coke fines in the lower BF and result in lower permeability and production of Hot Metal (HM). For understanding the behavior of BF bosh coke at various HM productivities, a coke sampler was used to collect the coke samples at the tuyere level for measuring the coke strength. The difference of sampled coke under the conditions of various HM productivities were explored, and the BF operating conditions and causes of generating more coke fines was correlated by testing the coke abrasion rate after reaction. According to the above analysis results, the relative regression equations had been obtained for sampling coke properties, BF operation conditions and BF permeability. Furthermore, the Coke Strength After Reaction (CSR) quantitative target and its online system at various blast conditions were set to provide some reference for coke and HM production.