Investigation on the uneven distribution of different types of ores in the hopper and stock surface during the charging process of blast furnace based on discrete element method

摘要

The model of an actual 4070 m(3) bell-less top blast furnace with two parallel hoppers was established, and the distribution of the sinter, pellet, and lump ore in the hopper and the stock surface was analyzed based on the discrete element method. The results show that the distribution of different types of ores is not uniform in the hopper already. In the radial direction of the stock surface, the sinter volume fraction in the center and peripheral region of the stock surface is higher than that in the intermediate region of the stock surface, but the volume distribution of the pellet and lump ore is opposite to the sinter volume distribution. Owing to the size of lump ore is small, so the pressure drop of burden layer in the intermediate region of the stock surface is larger than that in the center and peripheral region. In the circumferential direction of the stock surface, the standard deviation of the volume distribution of the sinter, pellet, and lump ore is 1.28, 0.92 and 0.49, respectively.