Simultaneous removal of SO 2 and NO X by wet scrubbing using urea solution

Abstract

The experiments were performed in a countercurrent packed column in a continuous mode to study the absorption of NO X and SO 2 in urea solutions. On the basis of high SO 2 removal efficiency, the NO X removal efficiencies under various experimental conditions were emphatically measured. The various influencing factors, such as urea concentration, temperature, initial pH value, oxidation degree of nitrogen oxides, SO 2 concentration and additive on removal efficiencies of NO X were studied experimentally, and the optimal conditions were established. The reaction products were analyzed, and reaction mechanism and total chemical reaction equations for simultaneous desulfurization and denitration using urea solution were deduced. Molar reaction enthalpy, molar formation Gibbs function and chemical reaction equilibrium constant were calculated by thermodynamic methods. The calculation results show that the simultaneous desulfurization and denitration are available, and the removal efficiencies are 100% nearly.