高温载硫活性炭的制备及脱汞能力研究

研究了载硫温度、硫炭比(简称S/C),吸附温度等因素对载硫活性炭的硫含量、脱汞能力以及硫损失的影响,探讨载硫活性炭制备的工艺条件优化。结果表明,不同载硫温度下制备的载硫活性炭的气态Hg0吸附能力远强于原料活性炭;载硫温度不同时,负载到活性炭孔隙或表面上的硫的形态不同,导致了脱汞能力的差异,较合适的载硫温度为350℃;S/C为5%(质量分数,下同)时,随着吸附温度的升高,载硫活性炭的气态Hg0吸附量降低;在一定的载硫温度下,原料中S/C越高时,制备的载硫活性炭的硫含量越高、气态Hg0吸附能力越强,但其硫损失率也越高,从实际的使用效果来看,较合适的S/C为10%。

Preparation of sulfur-loaded activated carbons for removing gaseous elemental mercury

Series of sulfur-loaded activated carbons were prepared for removing gaseous elemental mercury from simulated flue gas.The effects of sulfur loading temperature,sulfur and carbon ratio(S/C),and adsorption temperature on the sulfur-loaded activated carbons were investigated from 3 aspects of sulfur loading quantity,mercury adsorption capacity and sulfur stability.Results showed that the mercury removal ability of sulfur loaded activated carbon was much higher than raw activated carbon;the form of sulfur that loading on the surface or pore of activated carbon was different under different loading temperature,the best temperature for sulfur loading was 350 ℃.When the S/C was 5%(mass ratio),mercury capture ability of the activated carbons was decreased with increasing the adsorption temperature.Under the same loading temperature,higher sulfur loading content would promote mercury capture ability but also increase the sulfur loss,and the optimal S/C was 10%.