SO3 Reduction in the Flue Gas by Adding a Chemical Agent

Abstract

Chemical agglomeration is presented as a promising process to reduce the submicron particles and SO3 in coal-fired power plant, which uses chemical agent to induce particles and SO3 agglomerate and improves the removal efficiency of electrostatic precipitation (ESP). In this study, an experimental plant containing a chemical agglomeration chamber connected to an ESP unit has been built to investigate the particles and SO3 removal effect. The results showed that chemical agglomeration technology increased the average size of particles and the fine particle and SO3 concentration reduced at the ESP outlet, the improvement of collection efficiency was over 5%-20%. The removal mechanism was investigated by Density Functional Theory (DFT) calculations at molecular level, the reasonable calculation model with pectin as agglomeration agent was established, the interactions between SO3, H2SO4, SiO2 and pectin were explored. In the results, adsorption ability of pectin for H2SO4 is better than SiO2 and relative ener...