Abstract:

Most FCC units use CO combustion promotor to control the “after burn” of CO, but there are problems of large injection volume, high application cost, and increasing flue gas NO_x. In this study, a novel CO combustion promoter with high efficiency and low NO_x emission was developed and produced. The laboratory evaluation data and industrial application results show that this promoter has higher combustion activity, lower flue gas NO_x emission, better hydrothermal stability and stronger sulfur resistant deactivation performance. Compared with commercially available combustion promoter, the CO volume fraction is reduced by 35.9% to 40.2%, and the NO_x mass fraction is reduced by 15.9% to 19.4%. The application of the new high efficiency and low NO_x emission CO combustion promoter can reduce NO_x fluctuations, reduce SCR ammonia injection, save operating costs, and reduce salt deposition in waste heat boilers, which is beneficial for long-term operation of equipment.

Key words: FCC unit, low NO_x emissions, CO combustion promoter, smoke temperature, NO_x mass concentration, CO volume fraction, sulfur resistant deactivation, hydrothermal deactivation

摘要：

大部分催化裂化(FCC)装置采用CO助燃剂控制再生器CO尾燃，但存在加注量大、应用成本高以及烟气NO_x增加的问题。本研究开发生产出FCC新型高效低NO_x排放CO助燃剂，实验室评价数据和工业应用结果表明：该助燃剂具有更高的助燃活性、更低的烟气NO_x含量、更好的水热稳定性和更强的抗硫失活性能，相比市售助燃剂，CO体积分数降低35.9%～40.2%,NO_x质量浓度降低15.9%～19.4%;应用新型高效低NO_x排放CO助燃剂可减小NO_x浓度波动，降低SCR(选择性催化还原)注氨量，降低运行成本，减少余热锅炉结盐，有利于装备长周期运行。

关键词: 催化裂化装置, 低NO_x排放, CO助燃剂, 烟气温度, NO_x质量浓度, CO体积分数, 抗硫失活, 水热失活