Influence of SO₂ in the Medium to High Temperature Range of SO₃ Removal by CaO

Abstract

Injecting sorbents can effectively decrease the SO3 pollution, but its removal efficiency is reduced by the absorption owning to the abundant SO2. Experiments were carried out on a fix bed reacter to study the effect of SO2 on the deSO3 by CaO in the medium to high temperature range. The increase in temperature may obviously improve the removal efficiency of SO3, but the conversion of SO2 to CaO is much higher than SO3, resulting the SO3 selectivity decreases. Decreasing the SO2 concentration or increasing the SO3 concentration may increase conversion by CaO and SO3 selectivity, but the former is less influential than the latter.