搭建了新型喷淋散射塔实验台,研究了液气比、浸液深度、SO2浓度、石灰石浆液质量浓度和pH值等参数对SO2脱除效果的影响。相同工况下,新型喷淋散射法比喷淋或鼓泡模式具有更高的脱硫效率;随液气比、浸液深度、浆液pH值的增大,脱硫效率呈逐渐增大的趋势,而SO2浓度变化对脱硫效率几乎没有影响。同时,计算了实际运行中的喷淋散射塔和喷淋塔的能效,分析了脱硫系统中循环泵、增压风机和氧化风机等主要设备的能耗。以某300 MW机组为例,只考虑运行成本,喷淋散射塔主要设备的能耗约是喷淋塔的1/2,年节省标煤近8.8×103t。

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.