316L不锈钢凝汽管在运河水质循环水中的应用

Application of 316L stainless steel condenser pipes to the circulating water of the Great Canal

简述了运河徐州段的水质状况和316L不锈钢凝汽器管的物化性能,给出了一种以PBTCA、POCA、PESA、PAPEMP和T-225为主要成分的复合阻垢剂,用极限碳酸盐硬度法和动态模拟法试验,结果表明:在按补水计投药质量浓度为10 mg/L时系统可在k=3.5±0.5的浓缩倍数下安全运行;运河水对碳钢、HSn70-1B铜合金及316L不锈钢均具有较强的腐蚀作用,阻垢剂的加入将加剧金属的腐蚀;在系统中投加一定浓度的BTA-TTA-有机胺混合物可保证316L不锈钢的腐蚀率<0.003 mm/a。

The water quality at Xuzhou Section of Great Canal and the physical chemistry properties of 316L stainless steel condenser pipes are described A scale inhibitor composed of PBTCA, POCA, PESA, PAPEMP and T-225 is introduced. The results from the methods of utmost hardness of carbonates and of simulation in lab show that the system may work safely when the cycles of concentration is κ =3.5±0.5 and when the make-up water dosage is 10 mg/L It is proved that the water is very corrosive to carbon steel, HSn70-1B copper alloy and 316L stainless steel. The situation becomes worse due to the addition of the scale inhibitor. A mixture of BTA-TTA-amine can effectively keep the corrosion rate of the water on 316L stainless steel within 0.003 mm/a.