Study on NO Removal Characteristics of the Fe(II)EDTA and Fe(II)PBTCA Composite System

Abstract

Fe 2+ complexation wet denitrification technology has become a research hotspot. It is very important to achieve efficient regeneration of the absorbent and increase NO absorption in the Fe 2+ complexation system. They are the key to the industrial application of the Fe 2+ complexation absorption process. In this paper, 2-phosphonate-butane-1,2,4-tricarboxylic acid and ethylenediamine tetraacetic acid were used as ligands to prepare a composite system for the first time. The characteristics of NO removal were investigated under different temperatures, pHs, Fe 2+ concentrations, O 2 contents, NO concentrations, CO 2 contents, and SO 2 concentrations. Compared with the single ligand, the results show that the denitrification performance of the solution with a complex ligand is significantly improved. In this system, pH 9, 40 °C temperature, and 20 mmol/L Fe 2+ concentration are the economic ideal conditions for NO removal. The system can realize simultaneous removal of NO and SO 2 , but SO 2 in flue gas has a dual effect on the NO removal reaction.