催化裂化装置排放的二氧化硫问题及对策

叙述了我国催化裂化装置（ＦＣＣＵ）ＳＯ２排放严重超过现行国家标准且可能加剧的趋势，重点介绍并比较了控制排放的几种方法，指出：原料加氢预处理脱硫效果显著，但费用较高；使用硫转移催化剂，设备投资小，适宜于原料油含硫量低、采用ＣＯ完全燃烧再生方式的ＦＣＣＵ；湿式洗涤烟气脱硫工艺不受ＦＣＣＵ操作条件和原料油硫含量制约，ＳＯ２去除率９０％以上，能够同时去除粉尘。

FCCU SO 2 EMISSION AND CONTROL TECHNOLOGIES

SO 2 emissions from FCCUs in China have not met the national standard, in which the units processing residual oil and Middle East crudes make the situation even worse. Several FCCU SO 2 control technologies are compared as follows: feed hydrotreating can reduce sulfur content to a very low level, but requires a high cost; SO x transfer additives provide a low capital cost method for SO x emission control, which are suitable for processing low sulfur feedstocks and operating in CO complete combustion mode; flue gas wet scrubbing desulfurization technologies are not limited by FCCU operating conditions and sulfur contents in the feedstocks, the SO 2 removal rate can be higher than 90% and the dust can be removed simultaneously.