SNCR选择性非催化还原法脱硝技术在重油催化裂化装置的运用

摘要

中国石油广西石化分公司采用美国GE公司的选择性非催化还原(SNCR)法脱硝技术,对3.5 Mt/a催化裂化装置的CO焚烧炉进行改造.结果表明:使用SNCR工艺后,催化裂化装置出口烟气中NOx的质量浓度由改造前的200～400 mg/m3(标准状态),降低至70～130 mg/m3(标准状态),排放值满足《石油炼制工业污染物排放标准》中大气污染物NOx排放值不大于200 mg/m3(标准状态)的要求,实现了达标排放,并对催化裂化装置CO焚烧炉炉膛温度影响很小,对炉膛压力及对烟气脱硫装置外排污水的pH和氨氮含量无影响.SNCR工艺操作简单,改造量小,物耗、能耗低,在氨逃逸量小于设计值8 mg/m3(标准状态)的情况下脱硝效率高达72％.%Selective non-catalytic reduction (SNCR) technology of GE Company is applied to the CO burner of 3.5 Mt/a RFCC unit in Guangxi Petrochemical Company,CNPC.The results showed that using SNCR process,the NOx emission in RFCC flue gas decreases from 200 400 mg/m3 (standard state) to 70-130 mg/m3 (standard state) and meets the emission standard of pollutants for petroleum refining industry in which NOx emission is not more than 200 mg/m3 (standard state).It has little influence on the temperature of CO burner in RFCC unit.No effect on the pressure of the CO burner and pH and NH3-N of sewage in FGD unit is observed.The SNCR process is simple and easy to be revamped.The material and energy consumption is also low.The denitration efficiency is as high as 72 ％ if ammonia escape is less than 8 mg/m3.