拜尔法赤泥用于烟气脱硫:影响因素与机理（英文）

Removal of SO_2 from flue gas using Bayer red mud:Influence factors and mechanism

本文研究了由拜尔法赤泥与水制备吸收剂并应用于烟气脱硫。研究了固液比、吸收温度、入口SO_2浓度、O_2含量、SO_4^(2-)和拜尔赤泥中其他组分对烟气脱硫的影响,建立了烟气脱硫的机制。结果表明这些因素中固液比是最主要的因素,随后是入口SO_2浓度,温度的影响最小。当气体流量为1.5 L/min时,最佳的反应条件为:液固比20:1,吸收温度25°C,入口SO_2浓度1000 mg/m^3。当O_2含量高于7%后,O_2含量对脱硫效率的影响较小。SO_4^(2-)的累积抑制了脱硫效率。碱液吸收、液相催化氧化共占据脱硫进程中总贡献的98.61%。

The absorbent composing of Bayer red mud and water was prepared and applied to removing SO2 from flue gas.Effects of the ratio of liquid to solid(L/S),the absorption temperature,the inlet SO2 concentration,the O2 concentration,SO4^2-and other different components of Bayer red mud on desulfurization were conducted.The mechanism of flue gas desulfurization was also established.The results indicated that L/S was the prominent factor,followed by the inlet SO2 concentration and the temperature was the least among them.The optimum condition was as follows:L/S,the temperature and the SO2 concentration were 20:1,25℃and 1000 mg/m^3,respectively,under the gas flow of 1.5 L/min.The desulfurization efficiency was not significantly influenced when O2 concentration was above 7%.The accumulation of SO4^2-inhibited the desulfurization efficiency.The alkali absorption and metal ions liquid catalytic oxidation were involved in the process,which accounted for 98.61%.