Experimental investigation on the mechanism for removal of NOX by solution of urea /additive

This paper introduced mass transfer theory and correlation analysis of the NOx liquid absorption. Experiments using urea as the absorbent and triethanolamine as additive were performed in the bubbling absorption reactor. The influencing factors of the NOx removal such as the oxygen existence, sulfur dioxide existence, triethanolamine existence, absorbent concentration and ammonium sulfite were studied, and the ion concentration of NH₄⁺, NO₂^-, SO₃^2- and SO₄^2- in the solution was analyzed. This study has concluded that oxygen existence could increase oxidation of nitric oxide, which increased the denitrification efficiency. SO₂ existence could introduce sulfite ion and also promoted NOx removal efficiency. Triethanolamine could play a buffer and catalytic role in promoting NOx removal efficiency. Ammonium sulfite on denitrification efficiency had an obvious influence.