催化裂化装置氮氧化物减排技术研究

Technology of Controlling NO_x Emissions in FCCU

根据催化裂化装置排放烟气中(FCC)氮氧化物(NOx)的生成机理,控制原料中氮的含量,采用加氢(预)处理脱除原料中部分硫、氮、金属和残碳,然后进催化裂化装置加工,是控制FCC装置的NOx排放最重要的途径。控制再生条件和改变再生方式,将有利于降低NOx浓度,是催化裂化NOx减排控制的方向。Praxair联合开发了一种新型的CONOx技术和FCC富氧再生技术等均是控制NOx源头的治本手段。NOx排放末端控制方法(烟气脱硝方案)主要有SCR、SNCR和LoTOx TM,这些烟气脱硝处理方法的应用都有一定的限制。

According to the formation mechanism of NOx in FCCU flue gas, the most important way to cut FCCU NOx emission is to control the N content in FCCU feedstocks by pre-hydrotreating the feedstocks to remove S, N, metal and residual carbon. Another helpful way is to control regeneration condition to cut NOx concentration. The new CONOx technology and FCCU oxygen enrichment regeneration technology developed by Praxair are radical measures to control NOx at the source. The end-controlling technologies for NOx emission include SCR, SNCR and LoTOx TM, the flue gas deNOx methods are with some limitations in application.