煤粉-菱镁石混合喷吹对安钢高炉操作的影响

Effect of Pulverized Coal Injection with Magnesite on Blast Furnace Operation at Anyang Steel

对安钢7号高炉的造渣制度进行了分析,提出从风口添加含MgO物料是改善炉渣性能的有效途径.在安钢7号高炉进行了添加轻烧菱镁石的煤粉喷吹工业试验.结果表明:风口喷煤中添加轻烧菱镁石可以有效地解决w(Al2O3)升高对炉渣冶金性能和高炉冶炼的影响,有利于优化高炉生产指标.对安钢7号高炉,煤粉中添加轻烧菱镁石的适宜比例为3%;炉渣中w(MgO)/w(Al2O3)为0.60～0.65时,高炉铁水物理热明显改善、硫的分配系数有所提高.在实施混合喷吹措施时,应适当调整高炉的热制度、造渣制度、焦炭负荷,控制适宜的高炉"炉缸煤气热量的平衡点"等参数.

The slag marking of No.7 BF of Anyang Steel was analyzed,and then injecting raw materials containing MgO into BF through tuyere was proposed to improve slag properties.Industrial tests of pulverized coal injection with light burned magnesite were carried out at No.7 BF of Anyang Steel.The results showed that the adverse effect of high Al2O3 on metallurgical properties of slag is remitted,and the production index of BF is improved.When the addition of light burned magnesite is 3%,and w（MgO）/w（Al2O3） is 0.60～0.65 in slag,the hot metal temperature is improved significantly,and the sulfur distribution coefficient increases.To ensure high efficiency and smooth operation of BF with pulverized coal injection with magnesite,the thermal system,slag forming,coke burden,and ＂heat balance of hearth gas＂ should be controlled properly.