莱钢3200m^3高炉无计划休风操作实践

Operation Practice of Laiwu Steel's 3200 m^3BF Unscheduled Wind off

莱钢3#3 200 m3高炉因氮气管道泄漏停煤,造成高炉无计划休风13.5 h。停煤后及时采取停氧、减风、降低冶强、调整焦炭负荷等措施稳定炉况。氮气恢复后堵部分风口复风,送风面积为全风面积的95%,送风风量为全风的85%~86%,恢复喷煤富氧并过量喷煤(少喷煤量的1.35倍),复风后第3炉铁水温度超过1 500℃,没有对炉况造成大的波动。

The coal injection system stopped due to nitrogen pipeline leak in Laiwu Steel＇ s No.3 blast furnace with 3 200 m^3 volume, it caused 15.5 h downtime due to unscheduled wind off. To stabilize furnace conditions, the measurements have been taken after PCI stop, that included to stop oxygen-rich, reduce the quantity of wind and smelting strength, adjust coke load. After nitrogen restoration, some uyere were blocked, the air supply can be restored, and to control the tuyere area was 95% of the normal＇ s, the amount of supply air was 85%-86%of normal＇ s. And excess oxygen enriched pulverized coal injection were restored （It was 1.35 times the amount of coal injection as normal）. After restoration, the molten iron temperature in the third furnace was improved to more than 1 500 ℃, and it did not result in large impacts on the furnace conditions.