SCAL型间冷系统散热器铝管管口腐蚀关键水质影响因素  

Key Influencing Factor of Water Quality on Aluminum Pipe Orifice Corrosion in the Radiator of SCAL Indirect Air-Cooling System

作　　者：贾兰 杨振森 刘兴华 肖海刚 黄万启[2] 张洪博[2] JIA Lan;YANG Zhen-sen;LIU Xing-hua;XIAO Hai-gang;HUANG Wan-qi;ZHANG Hong-bo(Guoneng Ningdong Second Power Generation Co.,Ltd.,Yinchuan 750000,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China)

机构地区：[1]国能宁东第二发电有限公司,宁夏银川750000 [2]西安热工研究院有限公司,陕西西安710054

出　　处：《材料保护》2022年第12期197-203,217,共8页Materials Protection

摘　　要：SCAL型间冷系统中散热器铝管管口是最易发生腐蚀的位置,部分机组该位置甚至出现漏水现象,阐明该位置腐蚀类型及关键水质影响因素可为电厂化学运行人员提供指导,保障机组稳定运行。通过对国内3台SCAL型间冷散热器腐蚀情况进行现场调研、分析水质数据、悬浮物成分、结合实验室模拟试验,阐明了散热器铝管管口的腐蚀类型和关键水质影响因素。试验结果表明:SCAL型间冷系统散热器铝管管口腐蚀为冲刷腐蚀。在相同材质及流体流态下,循环水pH值升高至9.5后对铝管管口冲刷腐蚀具有明显的加速作用,可在短时间内导致铝管管口位置发生腐蚀破坏,是加速管口冲刷腐蚀的关键水质影响因素。化学运行人员应加强对循环水pH值的监测并及时调整。In SCAL indirect air-cooling system,the aluminum pipe orifice of radiator is the position most easily to be corroded.Water leakage even occurs at this position in some units.Clarifying the corrosion type and key influencing factor of water quality can provide guidance for chemical operators and ensure the stable operation of units.In this paper,the corrosion type of the aluminum pipe orifice of radiator and key influencing factor of water quality were illustrated by field investigation of three SCAL intercooling system radiators in China,the analysis of the water quality data and suspended substance composition as well as laboratory simulation test.Results showed that aluminum pipe orifice corrosion in the radiator of SCAL indirect air-cooling system was erosion corrosion.With the same material and fluid flow state,when the pH value of circulating water increased to 9.5,it could obviously accelerate the erosion corrosion of aluminum pipe orifice,which could lead to corrosion damage of aluminum pipe orifice in a short time.This was the key influencing factor of water quality that increasing the corrosion of pipe orifice.Chemical operators should strengthen the detection of pH value of circulating water and adjust it timely.

关 键 词：SCAL型间冷系统 冲刷腐蚀 影响因素 PH值 悬浮物 

分 类 号：TG172[金属学及工艺—金属表面处理]