Mass transfer enhancement for simultaneous desulfurization and denitrification by a venturi reactor

Interphase mass transfer is acknowledged as the rate-limiting step of simultaneous desulfurization and denitrification by wet oxidation . For this issue, this study established a venturi reactor to facilitate interphase mass transfer between flue gas and absorbent (NaClO 2 solution), and to improve the efficiency of simultaneous desulfurization and denitrification. The effects of flow rate of jet, NaClO 2 concentration, initial pH of solution, SO 2 and NO volume concentration on the efficiency of desulfurization and denitrification were investigated. The results showed that SO 2 can be completely removed at all experimental conditions. The denitrification efficiency decreased as jet flow rate increased from 8.38 L/ min to 12.87 L/min. The denitrification efficiency and overall mass transfer coefficient increased as the NaClO 2 concentration increased from 0.01 wt% to 0.025 wt%. When the pH of the absorbent decreased from 9 to 3, the denitrification efficiency was improved significantly. An increasing SO 2 volume concentration promoted NO removal efficiency, while SO 2 and NO competed to inhibit denitrification at NaClO 2 deficiency. The denitrification efficiency firstly increased and then decreased, with an increasing NO volume concentration from 500 to 1700 ppm. This study provides an important theoretical basis for the industrial application of simultaneous desulfurization and denitrification in venturi reactors.