鼓泡塔中有机酸强化粗颗粒石灰石新型烟气脱硫

New technology of wet FGD process using granular limestone and organic acid additives in bubbling reactor

对传统石灰石湿法烟气脱硫进行了改进，提出了一种新型烟气脱硫方法，即在鼓泡塔中添加有机酸，采用大颗粒石灰石（210μm）代替传统的细颗粒石灰石（5～20μm）进行脱硫。实验在鼓泡搅拌吸收反应器中对比研究了新老两种脱硫工艺。结果表明，当210μm石灰石浆液中醋酸摩尔浓度达10～30mmol／L，其脱硫率和石灰石利用率分别为95％和93．5％，均达到甚至优于传统石灰石脱硫结果。实验研究了影响脱硫率的各种因素：添加醋酸浓度、入口SO2浓度、石灰石浆液浓度、气体停留时间以及温度等，并提出添加醋酸促进SO2吸收的机理。运用该新型烟气脱硫方法，可降低电厂的基础投资和运行费用，大大加强系统的稳定性和抗击烟气中SO2波动的能力。

A new wet FGD process combining acetic acid and limestone slurry using for SO2 removal from gas streams was developed. The main difference compared to conventional wet FGD process is to utilize granular limestone directly as a desulphurization reagent while acetic acid was present so that the pulverizing of limestone can be omitted. When using granular limestone（210 um）as sole absorbent without the presence of acetic acid, the SO2 removal efficiency and limestone utilization were 60. 7 % and 44 % respectively. However, when adding 10- 30 mmol/L acetic acid into the system, the desulphurization was increased to 95% and the limestone utilization was enhanced to 93.5%.