生物质灰在低温受热面上的沉积点腐蚀机理分析  

Mechanism of Biomass Ash Fouling and Pit Corrosion in the Low Temperature Surface

作　　者：王启民[1] 张小辉[1] 杨海瑞[2] 吕俊复[2] 

机构地区：[1]沈阳工程学院生物质能利用重点实验室,沈阳110136 [2]清华大学热能工程系,北京100089

出　　处：《工业锅炉》2011年第2期1-4,共4页Industrial Boilers

基　　金：沈阳市科技局重点实验室建设基金资助项目(1091244-1-00)

摘　　要：针对纯烧生物质锅炉,位于高温烟气区的低温介质管道短时间内发生腐蚀泄露问题,通过腐蚀产物和20G管壁的SEM和XRD检测,确认其原因是氯化物造成的点腐蚀。氯元素造成的点腐蚀随着金属温度的升高而加快,介质温度低于400℃的钢管由于点腐蚀也可以在短时间内泄露。抑制受热面上的灰的沉积,将有效改善氯化物造成的点腐蚀。The corrosion products and G20 pipe were tested by SEM and XRD in order to found the reason of the low temperature heating surfaces of biomass boiler in the high temperature gas leaked out in a short time.It was founded that the pit corrosion which speed increased with the heating surface temperature was caused by chlorine.The heating surface could leak out in a short time because of the pit corrosion even though the operation temperature was below than 400 ℃.The chlorine pit corrosion could been lightened by avoid the biomass ash deposit in the surface.

关 键 词：生物质 点腐蚀 氯 低温受热面 

分 类 号：TK16[动力工程及工程热物理—热能工程]