Study on the Influence Factor of Coke Pulverization Rate and Its Effect on Operating Index of Large Blast Furnace

Abstract

The carbon dissolving reaction is the main factor for the deterioration of coke in the blast furnace. Therefore, in order to investigate the effect of coke deterioration on the permeability of blast furnace, the Coke Pulverization Rate (CPR) which represented the degree of Matrix carbon loss after carbon dissolution was put forward in this paper. The results showed that the CPR increases with the increase of volatile of coal blending, ash content of coke, M₁₀ and coke reactivity index (CRI), while decreases with the rising of M₄₀ and coke strength after reactivity (CSR). Analysis of the production data of 5BF blast furnace of Meishan Steel showed that under the conditions of coke ash (A_d) < 12.2%, M₁₀ < 6.5%, M₄₀ > 87%, CRI < 26% and CSR > 66%, the CPR would be less than 23%, which is conductive to ensure stable permeability large blast furnace.