垃圾焚烧炉高铬白口铸铁炉排片腐蚀穿孔失效分析  

Failure Analysis on Corrosion and Perforation of High Chromium White Cast Iron Grate Plate in a Waste Incinerator

作　　者：王勇 WANG Yong(Electric Power Research Institute, State Grid Anhui Electric Power Co., Ltd., Hefei 230000, Chin)

机构地区：[1]国网安徽省电力有限公司电力科学研究院,合肥230000

出　　处：《理化检验（物理分册）》2018年第4期280-283,289,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某垃圾焚烧炉投入运行17 440h后,其高铬白口铸铁炉排片发生腐蚀穿孔失效,通过宏观检验、化学成分分析、金相检验、硬度试验、扫描电镜及能谱分析等方法,分析了该炉排片腐蚀穿孔失效的原因。结果表明:机组运行时冷却风量不足,焚烧垃圾中的氯、硫等腐蚀性元素导致炉排片在铬元素偏析位置发生高温腐蚀反应,腐蚀产物在高温烟气的快速冲刷下不断脱落,使炉排片壁厚不断减薄,最后在薄弱部位发生腐蚀穿孔失效。After a certain waste incinerator was put into operation for 17 440 h,corrosion and perforation failure happened to its high chromium white cast iron grate plate.Through the methods of macroscopic inspection,chemical composition analysis,metallographic examination,hardness test,scanning electron microscopy and energy spectrum analysis,the corrosion and perforation reasons of the grate plate were analyzed.The results show that the cooling air flow was insufficient during the operation of the unit,and corrosive elements such as chlorine and sulfur in the garbage led to the high-temperature corrosion reaction of the grate plate at the segregation position of chromium.The corrosion products continuously fell off under the rapid flushing of high-temperature flue gas,which made the wall thickness of the grate plate thinning.Finally,corrosion and perforation failure occurred at the weak position.

关 键 词：垃圾焚烧 炉排片 高铬白口铸铁 高温腐蚀 铬偏析 

分 类 号：TG172.32[金属学及工艺—金属表面处理]