摘要
以旋流板塔为吸收器进行镁强化石灰脱硫的实验研究 ,测定了脱硫率、浆液pH值等随时间的变化情况 ,考察了硫酸镁浓度的影响 ,并利用实验数据计算了石灰利用率 .与单用石灰脱硫对比 ,添加硫酸镁可明显提高脱硫率 ;对具有 2块板的旋流板塔 ,硫酸镁浓度为 0 2mol L时 ,脱硫率从 4 5%提高到 60 %以上 .为保证较高的脱硫率 ,pH值宜控制在 6 0～ 7 5.由于硫酸镁能促进石灰的溶解 ,减缓pH值的下降 ,因此又可提高石灰利用率 ;适宜条件下 ,0 2mol L硫酸镁强化时可提高石灰利用率 5% (所加石灰为基准 )以上 .
Wet flue gas desulfurization(FGD) process with magnesium-enhanced lime slurry was conducted on a rotating-stream-tray tower. Changes of SO 2 removal efficiency and slurry pH with time were experimentally determined. Effects of magnesium sulfate concentration were investigated and the lime utilization was calculated according to experimental data. In comparison with lime FGD process, adding magnesium sulfate could effectively enhance SO 2 removal efficiency; when the adequate magnesium sulfate concentration was 0.2mol/L, the removal efficiency was more than 60% with two rotating-stream-trays, while the removal efficiency of lime process was only 45%. To achieve higher SO\-2 removal efficiency, the slurry pH should be controlled between 6.0 and 7.5. Magnesium sulfate could also promote lime dissolution, slow down descent of slurry pH and increase lime utilization; when magnesium sulfate concentration was 0.2mol/L, lime utilization could be increased by more than 5 percentage point under adequate conditions.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2001年第3期104-107,共4页
Environmental Science
基金
国家"九五"重点科技攻关课题! (96 910 0 1 0 2S 0 4)
关键词
烟气脱硫
旋流板塔
硫酸镁
石灰
二氧化硫
flue gas desulfurization
rotating-stream-tray tower
magnesium sulfate
lime
sulfur dioxide
