摘要
阐述了水系统腐蚀机制,其中包括冲刷磨损,气蚀,CO2、H2S、HCOOH等酸性介质引发的电化学腐蚀,Cl-引发的氯化物应力腐蚀以及NH4+、CN-等含氮离子引发的多重腐蚀作用,并介绍了水系统中的腐蚀易发部位.同时,从材质选择、装置/工艺设计和监测管理3方面结合煤气化装置实际调研情况,分析总结了应对腐蚀的防护措施,提出建立设备/管道腐蚀风险智能预测系统,以期为煤气化行业腐蚀现状的改进提供参考.
Abstract
As the"blood"circulatory system of coal gasification plant,the water system frequently faces corrosion and leakage problems due to the complex environment with high solid content,corrosive media and high temperature and pressure,which seriously affect the safty of production operation.The corrosion mechanism of the water system was explained,which included erosive wear,cavitation,electro-chemical corrosion triggered by CO2,H2S,HCOOH and other acidic media,chloride stress corrosion in-duced by Cl-,and multiple corrosion caused by NH4+,CN-and other nitrogen ions.The corrosion-prone sites of the water system were also introduced.Moreover,combined with the actual research of coal gas-ification devices,the protective measures against corrosion were analyzed and summarized in term of the material selection,device/process design and monitoring management.Establishing an intelligent cor-rosion risk prediction system for equipment/pipeline was proposed.These strategies shed light on im-provement of corrosion status in coal gasification industry.
NETL
NSTL
维普
万方数据