梅钢4号高炉冷却水系统存在的问题及其改造  

Problems and Solution of Cooling Water System of No.4 Blast Furnace in Meishan Iron & Steel Co.,Ltd.

作　　者：朱正林[1] 

机构地区：[1]上海梅山钢铁股份有限公司,江苏南京210039

出　　处：《中国给水排水》2017年第16期103-106,共4页China Water & Wastewater

摘　　要：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。The open circulation cooling system of industrial water was used for the main body of Meishan No. 4 blast furnace. Hardness, alkalinity and suspended solid in circulating water are relatively high. As a result, water scale deposited to the inner wall of cooling water pipe. Then, the cooling effect decreased significantly. At last, a large number of pipe root cracks and wall wear occurred in the copper cooling stave of blast furnace. The circulation water quality was apt to lead to water scale via determination by the rate and pi scaling peline water index （PSI） of Puckorius. The influence of fouling and circulating water flow pickling on cooling effect of cooling wall was analyzed. The renovation solution from industrial water open circulation cooling to soft water closed circulation cooling was also introduced in this paper. The quality control indexes of soft water were： suspended solid ≤2 mg/L, total hardness （ CaCO3 ） ≤2 mg/L, pH 7 -8. The water flow of circulating system part I （furnace bottom cooling pipe, hearth cooling wall, tuyeresleeve, etc. ） was increased to 3 604 m3/h. The water flow of circulating system part II （ copper cooling plate, copper cooling wall, stack cast iron cooling wall, etc. ） was increased to 4 064 m3/h. Through the renovation process, the operation of circulating water system was normal, the cooling effect of blast furnace body was improved evidently, the safety and stable operation of blast furnace was ensured.

关 键 词：高炉 循环冷却水 结垢 

分 类 号：TF549[冶金工程—钢铁冶金]