文献类型：期刊文献

英文题名：Influence of wet flue gas desulfurization on the pollutants monitoring in FCC flue gas

作者：Ju, Feng[1];Wu, Cong[1];Luan, Hui[2];Tang, Zhihe[3];Pan, Helin[1];Pan, Hui[1];Xiu, Guangli[2,4,5];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]China Natl Petr Corp, Res Inst Safety & Environm Technol, Beijing 102206, Peoples R China;[4]East China Univ Sci & Technol, Shanghai Environm Protect Key Lab Environm Stand, Shanghai 200237, Peoples R China;[5]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2021

卷号：28

期号：39

起止页码：55502

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：;EI(收录号：20242616370948);WOS:【SCI-EXPANDED(收录号:WOS:000662916500018)】；

基金：This work is supported by the National Natural Science Foundation of China (22008071) and Shanghai Sailing Program (No. 19YF1410800).

语种：英文

外文关键词：FCC flue gas; Alkali-based WFGD; FTIR; Factor analysis; (NH4)(2)SO3

摘要：Fluid catalytic cracking (FCC) unit emits a large amount of flue gas, which is a major concern of environmental protection supervision. Wet flue gas desulfurization (WFGD) technologies have been widely used to control the emissions of SO2 in refineries. In this study, stack tests for pollutants emission of a typical FCC unit were conducted. The emission characteristics of the FCC unit indicated that WFGD would cause a large amount of water vapor in the flue gas, which indirectly leads to large quantities of salt pollutants entrained in the flue gas including ammonium sulfite ((NH4)(2)SO3) and ammonium sulfate ((NH4)(2)SO4). A strong correlation among the concentrations of SO2, NH3, and H2O was observed, and factor analysis shows that these concentrations are dominated by a common factor. It was also found that a mass quantity of NH4+ and SO32- existed in the condensate water of the flue gas. The TG-MS analysis shows that (NH4)(2)SO3 could be decomposed at 94.1 degrees C, and NH3, SO2, and H2O are released as reaction products in the form of gas. Therefore, a part of the NH3 and SO2 obtained by Fourier transform infrared spectroscopy (FTIR) monitoring may be derived from the decomposition of (NH4)(2)SO3 in the flue gas due to the high temperature during the sampling process, which was also confirmed in a lab experiment. The hot and wet sampling process will lead to overestimation of NH3 and SO2 emissions rather than FTIR method itself when monitoring the high-humidity FCC flue gas. Thus, the concentration of H2O in the flue gas and the type of sampling process need to be taken into consideration during the monitoring process.