关键词: 催化裂化, 再生过程, 烧碳, 烧硫, 烧氮, SO_x, NO_x

Abstract: The FCC regeneration process involves the combustion of carbon, hydrogen, sulfur, and nitrogen. The intermediate products of combustion such as CO, SO₂ and NO also undergo oxidation and reduction reactions with each other. Although the existing desulfurization and denitration facilities can better achieve the environmental protection objectives, there is still room for improvement in environmental optimization and long-term operation. When the environmental optimization work is carried out, the front end treatment function of the regeneration process is often ignored, or environmental optimization is simply discussed putting the coke burning of regeneration process aside. It is easy to enter such a misunderstanding, which reflects that the current theoretical research in this field is not comprehensive enough. From the perspective of engineering design, combined with single theoretical research and industrial examples, this paper discusses how to ensure the effect of coke burning and do a good job in the front end treatment of SO_x and NO_x. According to the two routes of complete regeneration and incomplete regeneration, the causal variables of SO_x and NO_x in the whole regeneration process are sorted out, and the optimization suggestions are put forward respectively.

Key words: FCC, regeneration process, combustion of carbon, combustion of sulfur, combustion of nitrogen, SO_x, NO_x