Effect of coke reactivity on softening-melting and dripping behaviors of sinter

The use of high reactivity coke in blast furnaces is an important direction for low-carbon development. In this study, we investigated the effect of coke reactivity on the softening-melting behaviors of the sinter. The results show that the gasification temperature of coke decreased with increasing coke reactivity. With increasing coke reactivity from 24.75% to 45.11%, the initial melting temperature rose from 1294 degrees C to 1312 degrees C, the dripping temperature dropped from 1522 degrees C to 1507 degrees C and the melting region decreased from 228 degrees C to 195 degrees C, respectively. The cohesive zone shifted downward and the thickness narrowed. The permeability index and highest differential pressure dropped from 1219.67 KPa center dot degrees C to 607.61 KPa center dot degrees C and from 7.0962 KPa to 4.8523 KPa, respectively. Coke with high reactivity can improve the gas permeability of burden. The gas utilization ratio in the softening-melting and dripping processes of the sinter raised by about 2% with increasing coke reactivity.

Automated summary

The use of high reactivity coke in blast furnaces is a key aspect of low-carbon development. This study examined the impact of coke reactivity on the softening-melting behaviors of sinter. It was found that as coke reactivity increased, the gasification temperature of coke decreased. Increasing coke reactivity from 24.75% to 45.11% resulted in an increase in initial melting temperature, a decrease in dripping temperature, and a decrease in melting region. The cohesive zone also shifted downward and narrowed, while the permeability index and highest differential pressure decreased.