梅钢5号高炉炉墙结厚的原因及炉况恢复

Causes of Wall Accretion in Meishan Steel No.5 BF and Corresponding Recovery Actions

对梅钢5号高炉炉墙结厚的原因及炉况恢复进行了总结。5号高炉开炉以来首次炉墙结厚,主要征兆是全炉水温差下降和炉身静压力曲线值出现偏差。结厚的主要原因:一是焦炭质量劣化,入炉焦炭CRI最高上升至23.6%左右,灰分在12.5%左右;二是烧结矿质量劣化,品位降至57.0%左右,FeO含量降至8.5%左右;三是炉渣(Al_(2)0_(3))最高上升至19.0%左右;四是入炉有害元素含量超标,锌负荷升至0.36 kg/t,碱金属负荷最高上升至3.0 kg/t;五是炉况持续恶化。通过采取发展边沿气流、提高入炉风量、提高炉温加锰矿洗炉等措施,炉况得到恢复。

It is summarized the causes of wall accretion in Meishan Steel No.5 BF and the corresponding recovery actions.The wall accretion,which occurs in the first time after the furnace is blown-on,is mainly signified by the decrease of the water temperature difference of the whole furnace,and the deviation of the static pressure curve of the furnace stack.This problem is mainly caused by:(1)deterioration of the coke quality with the highest CRI of the charged coke rising to about 23.6%,and the ash content reaching 12.5%approximately;(2)deterioration of the sinter with the grade dropped to about 57.0%,and the Fe0 content dropped to about 8.5%;(3)rising of the slag(Al_(2)O_(3))content,up to 19.0%;(4)over limit of the harmful element content in the furnace with the zinc load rising to 0.36kg/t,and the basic metal load climbing to 3.0kg/t;(5)deterioration of the furnace condition.After the actions of developing the edge gas flow,increasing the blast flowrate and the furnace temperature,and charging manganese ore for slugging,the furnace goes back to the normal condition.