A novel gas-sparged quench box with multiple swirling flow structures was designed. With the gas velocity of 10—80 m·s-1 and liquid velocity of 0.2—0.7 m·s-1 in a cold-flow model experiment

the liquid volumetric mass transfer coefficient (kLa) was measured using the oxygen absorption method

and the interfacial area (a) was measured using air-Na2SO3 solution chemical absorption method. The results showed that mass transfer parameters increased with the increase of gas jet velocity and liquid inlet velocity

especially changing more pronouncedly with fluctuation of gas jet. The kLa and a were better than traditional quench box's performance and were at the same order of magnitude as mechanically stirred device

which illustrated that the multi-swirling quench box is capable of excellent mixing performance. Empirical correlations

obtained through dimensional analysis

fit the experimental data well and could be used to predict the mass transfer characteristics.