RECENT IMPROVEMENTS IN BLAST FURNACE OPERATION WITHIN THE AHMSA/GAN, MONCLOVA MEXICO WORKS

摘要

Following the privatization of Altos Homos de Mexico in November 1991 four areas were chosen to improve blast furnace performance and hot metal costs. These areas included improvement of pellet quality, start of oil-gas co-injection in the blast furnace, improved control of gas flow in the blast furnace and start of monitoring program to predict the remaining life of the hearth of the major blast furnace at AHMSA.rnThe efforts resulted in the following improvements in the first half of 1992:rn1. production level increased to 2.4 ton/m~3/24 hrs; moreover, the annual production record of blast furnace 5 (hearth diameter 11.2 m, 37 ft) set in 1992, was 1.639 mln tonnes. 2. coke rates decreased by 60 kg/tonne, half of which was due to process improvements and the other half to injection of oil.rn3. silicon standard deviations decreased from 0.22% in 1991 to 0.20% in 1992. 4. Hot metal costs decreased with 10.6%. 5. The major reline of BF 5 can be postponed by at least 1.5 year.