填料塔中钠碱溶液脱除烟气中SO_2研究

在内径为400 mm的填料塔内,以Na2SO3为吸收剂进行了烟气脱硫模拟实验研究,重点考察了吸收液pH值、液气比(VL/Vg)、空塔气速、烟气中SO2初始浓度、吸收液温度及吸收剂初始浓度等对脱硫率的影响,确定出各影响因素与脱硫率间的关系及实验室规模下本工艺适宜的操作条件。结果表明,在吸收液pH=6—7、液气比1—2 L/m3、空塔气速1—1.5 m/s、吸收液温度50℃以下、吸收剂Na2SO3初始浓度0.3—0.5 mol/L、进口SO2质量浓度约为4 300 mg/m3时,脱硫率均可大于80%。实验结果可为实际脱硫装置设计及运行提供必要的基础数据。

Research on SO2 absorption in flue gas by sodium alkali solution in packing column

The sodium alkali(Na_2SO_3) flue gas desulfurization (FGD) process was studied experimentally in a packing column of diameter 400 mm. Main parameters affecting SO_2 removal efficiency were studied for this process,including pH value of the absorption solution,liquid-gas ratio(V_L/V_g),superficial gas speed,inlet SO_2 concentration,temperature of absorption solution and initial Na_2SO_3 concentration.The relation between ratio of desulfurization and every parameter was investigated.And the suitable operational conditions of SO_2 absorption in lab are recommended.The experimental results show that SO_2 removal efficiency may be over 80% under the following conditions: pH=6-7,V_L/V_g=1-2 L/m3,superficial gas speed is 11.5 m/s,absorption temperature is below 50 ℃,Na_2SO_3 initial concentration is 0.3-0.5mol/L,and SO_2 initial concentration is 4 300 mg/m3.The experimental data can provide the necessary basic data for the design and operation of the practical desulfuriation equipment.