湿法脱硫后尾气烟囱结构选型及防腐方案论述  

Discussion on Structure Selection and Anti-corrosion Scheme of Off-gas Stack After Wet Desulfurization

作　　者：岳焕玲[1] YUE Huan-ling

机构地区：[1]中国恩菲工程技术有限公司,北京100038

出　　处：《有色设备》2022年第4期87-91,共5页Nonferrous Metallurgical Equipment

摘　　要：烟囱是工业企业一个重要的不可缺少的构筑物,同时也是一个排放烟气的重要设施,通过烟囱将废气排放入周围大气。湿法脱硫工艺对烟气中的SO_(2)脱除效率很高,但对造成烟气腐蚀主要成分的SO_(3)脱除效率不高,因此烟气脱硫后,对烟囱的腐蚀隐患并未消除,相反脱硫后的烟气环境会使腐蚀状况进一步加剧。本文分析了烟气经过湿法脱硫后的腐蚀机理,叙述了常见的排放烟气的烟囱结构形式,总结了排放腐蚀性烟气的烟囱结构型式选择原则,介绍了烟囱内衬的类别及八种常见的烟囱防腐蚀内衬材料。排放经过湿法脱硫后烟气的烟囱必须根据工程实际情况选择合适的防腐蚀内衬材料。Stack is an important and indispensable structure of industrial enterprises,and it is also an important facility to discharge off-gas,through which waste gas is discharged into the surrounding air.Wet desulfurization process has high efficiency in removing SO_(2) in off-gas,but low efficiency in removing SO_(3) which is the main component causing off-gas corrosion.Therefore,after off-gas desulfurization,the potential corrosion of the stack is not eliminated,on the contrary,the off-gas environment after desulfurization will further aggravate the corrosion situation.This paper analyzes the corrosion mechanism of off-gas after wet desulphurization,describes the common structure forms of stack to discharge off-gas,summarizes the principle of structure selection of stack to discharge corrosive off-gas,and introduces the categories of stack lining and eight common anti-corrosion lining materials of stack.The stack to discharge off-gas after wet desulfurization shall adopt suitable anti-corrosion lining material according to actual engineering conditions.

关 键 词：湿法脱硫 烟囱 防腐内衬 烟囱结构 

分 类 号：X773[环境科学与工程—环境工程]