Experimental research and energy consumption analysis on deep removal of SO2 by novel spray-and-scattered-bubble method

Parameters influencing the removal of SO2 from simulated flue gas by setting up a novel spray-and-scattered- bubble experimental table,such as liquid-gas ratio,immersion depth of bubbling pipes,inlet SO2 concentration,lime- stone slurry concentration and initial pH value,etc,were investigated in this study. Results show the SO2 removal effi- ciency in the novel spray-and-scattered-bubble tower is far higher than that in spray tower or jet bubbling reactor at the same conditions. The efficiency increases with rising liquid-gas ratio,rising immersion depth and rising limestone slurry concentration gradually,while it is nearly invariable with rising SO2 concentration. Meanwhile,the differences in energy consumption were analyzed between the novel spray-and-scattered-bubble tower and spray tower,especially on circu- lating pump,booster fan and oxidation fan. Taking a 300 MW unit for an example,the energy consumption of the spray- and-scattered-bubble tower accounts for almost half of that in a spray tower so that it can save 8. 8×103 t standard coal annually when only operating cost was considered.