催化裂化烟气脱硝脱硫除尘新技术

摘要

催化裂化(FCC)装置是炼油企业主要的粉尘、SOx和NOx排放源.针对FCC烟气的特点,中国石化开发了具有完全自主知识产权的SCR脱硝-热量回收-CO氧化高效耦合工艺和新型湍冲文丘里湿法脱硫除尘一体化工艺;开发了适用于催化裂化烟气脱硝的高强度SCR催化剂;开发了喷氨格栅、格栅式文丘里、喷头和高效除雾器等关键设备和内构件产品.在中国石化镇海炼化分公司建成国内首套FCC烟气除尘脱硫脱硝装置,工业运行结果表明,净化烟气中粉尘浓度小于20 mg/m3、SO2浓度小于10 mg/m3、NOx浓度小于50 mg/m3(最小20 mg/m3以下),逃逸氨浓度小于2.0 mg/m3.%FCC is an important emission source of oil refinery.In view of the characteristics of FCC flue gas,a combined technology of denitration and desulfurization and dust removal was developed by SINOPEC with completely independent intellectual property rights.It includes SCR(selective catalytic reduction)-heat recovery-CO oxidation process,new type of turbulent impulse Venturi for FCC flue gas dust removal and desulfurization,high mechanical strength honeycombed SCR catalyst for flue gas denitrification,key equipments and patented internal components such as ammonia spraying component,venturi grid,spraying nozzle,high-efficient demister.The first unit for denitration and desulfurization and dust removal of FCC flue gas was built in Zhenhai.The industrial results showed that the dust,SO2,NOx concentration in purified flue gas is less than 20 mg/m3,10 mg/m3,50 mg/m3,respectively,with the minimum NOx concentration less than 20 mg/m3,and the concentration of ammonia escaped less than 2.0 mg/m3.