文献类型：期刊文献

英文题名：Effect of regeneration conditions on the emission of HCN in FCC regeneration process

作者：Ju, Feng[1];Zhao, Xinyi[1];Luan, Hui[2];Lin, Jueying[1];Xiu, Guangli[2,3,4];Ling, Hao[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Environm Protect Key Lab Environm Stand, Shanghai 200237, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2020

卷号：389

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20200908214024);WOS:【SCI-EXPANDED(收录号:WOS:000519528800052)】；

基金：The support from the Fundamental Research Funds for the Central Universities of China is gratefully acknowledged.

语种：英文

外文关键词：HCN emission; FCC; Regeneration conditions

摘要：Stringent environmental regulations have made HCN emission from fluid catalytic cracking (FCC) unit attracted more attention. HCN is always considered as a volatile intermediate, which is transformed into NOx after oxidation. However, the on-site monitoring data from a typical FCC unit in this work showed that HCN emissions were much higher than expected. The spent FCC catalysts were analyzed by different methods to identify HCN precursors, and found that pyridinic nitrogen (N-6), pyrrolic nitrogen (N-5), and quaternary nitrogen (N-Q) are the main precursors of HCN. In the regeneration process, most of pyridinic nitrogen was transformed into NH3 and HCN, while the rest were partially oxidized to N-5, and the degree of oxidization conversion is related to regeneration temperature and oxygen concentration. A series of experiments were conducted on a fixed-bed regenerator to evaluate the effects of different regeneration conditions on the nitrogen-containing gas emission. Experiment results demonstrated that low oxygen concentration is beneficial to the reduction of HCN emission during the partial combustion regeneration stage. Under complete combustion condition, with excess oxygen content, the contents of NO, HCN and NO2 are much higher than these under partial combustion conditions, indicating that the oxygen content affects the emission of nitrogen-containing gas significantly.