The absorption efficiency of stereoscopic and swirl parallel flow trays with different turning angles of blade (30°

45°

and 60°)were measured for single tray

double trays with co-rotating

and double trays with counter-rotating under different operating conditions in SO2-seawater testing system.The effects of turning angle of blade

liquid flux and liquid gas ratio on absorption efficiency were analyzed.The result showed that under the best operating condition for the seawater flue gas desulfurization

turning angle of blade 60°

liquid-gas ratio of 19.07 L·m-3 and double trays with counter-rotating

the absorption efficiency was 85%.The stereoscopic and swirl parallel flow tray presents good characteristics in a relatively wide range of operating condition because of its distinctive structure and concurrent flow in whole tower.