摘要
为解决催化裂化(FCC)再生烟气中SO_(3)酸雾气溶胶含量较高导致的颗粒物超标排放及蓝色烟羽问题,在浙江石油化工有限公司450万t/a重油FCC装置及300万t/a蜡油FCC装置采用选择性非氨基还原(SNAR)除酸脱硝技术,利用气力输送将固体粉末状SNAR还原剂喷入装置的烟道或炉膛内,考察烟气系统SO_(3)酸雾气溶胶的外排浓度控制情况。结果表明:SNAR技术对再生烟气中SO_(3)的脱除率为30%~70%,从而降低外排烟气中的硫酸盐及气溶胶等可凝结颗粒物的含量,保证颗粒物达标排放,显著改善烟气蓝烟拖尾现象;SNAR技术对NO_(x)的脱除率可达30%~60%,与选择性催化还原(SCR)脱硝技术结合可达到60%~90%,无二次污染,在优化输送管路及喷枪布置后可保证氨逃逸值在3μg/g以下,且对FCC装置的运行无负面影响。
In order to solve the problems of excessive emission of particulate matter and blue plume caused by high content of SO_(3) acid mist aerosol in fluid catalytic cracking(FCC)regenerated flue gas,the selective non-amino reduction(SNAR)technology was adopted in 4.5 Mt/a heavy oil FCC unit and 3.0 Mt/a wax oil FCC unit of Zhejiang Petrochemical Co Ltd,and the solid powder reductant was injected into the flue or furnace of the unit by pneumatic conveying.The emission concentration control of SO_(3) acid mist aerosol in flue gas system was investigated.The results showed that the removal rate of SO_(3) in flue gas by SNAR technology was 30%-70%,which reduced the content of condensed particulate matter such as sulfate and aerosol in the discharged flue gas,ensured the discharge of particulate matter to meet the standard,and significantly improved the phenomenon of blue smoke tailing in flue gas.The removal rate of NO_(x) by SNAR technology could reach 30%-60%.Combined with selective catalytic reduction(SCR)denitration technology,it could reach 60%-90%,without secondary pollution.After optimizing the conveying pipeline and spray gun location of SNAR reductant,the ammonia escape value could be ensured below 3μg/g,and there was no negative impact on the operation of FCC unit.
作者
郑小辉
隋建国
林瀚
沈建中
李超
杨志鹏
刘甜甜
王国刚
ZHENG Xiao-hui;SUI Jian-guo;LIN Han;SHEN Jian-zhong;LI Chao;YANG Zhi-peng;LIU Tian-tian;WANG Guo-gang(Zhejiang Petrochemical Co Ltd,Zhoushan 316000,China;Qingdao Huicheng Environmental Technology Group Co Ltd,Qingdao 266500,China)
出处
《石化技术与应用》
2025年第3期240-244,共5页
Petrochemical Technology & Application
关键词
催化裂化
再生烟气
SO_(3)酸雾
除酸脱硝
还原剂
fluid catalytic cracking
regenerated flue gas
SO3 acid mist
acid removal and denitration
reductant
