循环水系统铜质换热器腐蚀原因及控制

循环水系统铜质换热器出现腐蚀，将严重威胁生产装置的安全运行。针对中国石化北方某石化企业循环水系统现场监测铜片腐蚀速率超标现象，对循环水水质的腐蚀特性、氨氮、有机磷、微生物d的含量等因素进行了综合分析，结果表明，在这些因素中碱度低、氨氮浓度超标、氯离子浓度高是引起铜质试片腐蚀的主要原因，采取提高M碱度和提高铜缓蚀剂的使用浓度等应对措施，可以有效降低铜质设备的腐蚀速率，避免铜质换热器腐蚀给装置带来的安全风险。

CORROSION CAUSES AND CONTROL OF COPPER HEAT EXCHANGER IN CIRCULATING WATER SYSTEM

Corrosion of copper heat exchanger is a serious threat to the stable operation of production equipment. In view of the over-standard corrosion of copper strip in the circulating water system of a petrochemical enterprise in north China, the corrosion characteristics, ammonia, organic phosphine, microorganism and other factors of the circulating water quality were comprehensively analyzed. Among these factors, low alkalinity, over-standard ammonia content and high concentration of chloride ion were the main reasons for the corrosion of copper strip. Measures such as increasing the M alkalinity and the concentration of corrosion inhibitor were taken, which could effectively reduce the corrosion rate of copper equipment and avoid the safety risk of copper heat exchanger corrosion to the production unit.