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梅钢4号高炉本体采用工业水开式循环冷却,循环水硬度、碱度、悬浮物普遍较高,冷却水管内壁结垢严重,冷却效果显著下降,导致高炉铜冷却壁出现大量管根拉裂和壁体严重磨损。利用帕科拉兹(Puckorius)结垢指数(PSI)判断出循环水为结垢型水质,分析了水管内壁结垢、循环水流量、管道酸洗对冷却壁冷却效果的影响。介绍了高炉本体冷却水由工业水开式冷却改为软水密闭冷却实施方案。软水水质控制指标为悬浮物≤2 mg/L、总硬度(Ca CO_3)≤2 mg/L、p H值为7~8。循环水Ⅰ系(炉底水冷管、炉底炉缸冷却壁、风口中套等)流量增加为3 604 m~3/h,循环水Ⅱ系(铜冷却板、铜冷却壁、炉身铸铁冷却壁等)流量增加为4 064 m~3/h。通过改造,循环水系统各项指标运行正常,高炉本体设备冷却效果提高明显,保障了高炉安全和生产稳定。
No.4 blast furnace body adopts industrial water open cycle cooling. Circulating water hardness, alkalinity and suspended solids are generally high. The inner wall of the cooling water pipe is seriously fouled, and the cooling effect is significantly reduced, resulting in a large number of tubular root fissures And wall severely worn. Based on the Puckorius fouling index (PSI), the recirculation water was determined as fouling water quality. The effects of scale fouling, circulating water flow and pipe pickling on the cooling effect of stave were analyzed. Introduced the blast furnace main body cooling water from the industrial water cooling to the soft water airtight cooling implementation plan. Soft water quality control indicators for the suspended solids ≤ 2 mg / L, total hardness (Ca CO_3) ≤ 2 mg / L, p H value of 7 to 8. Circulating water Ⅰ system (bottom water cooling pipe, bottom hearth cooling stave, tuyere sleeve, etc.) to increase the flow of 3 604 m ~ 3 / h, circulating water Ⅱ system (copper cooling plate, copper stave, Wall, etc.) flow increased to 4 064 m ~ 3 / h. Through the transformation, the indicators of the circulating water system are operating normally, the cooling effect of the blast furnace body equipment is obviously improved, and the blast furnace safety and the production stability are ensured.