钙基类吸附剂脱除烟气中气态汞的试验研究

The characteristics of mercury adsorption by Cabased sorbents were experimentally measured in a benchscale fixedbed mercury adsorption facility with a mercury permeation tube embedded in an isothermal water bath and simulated flue gas compositions. The adsorption performance of calciumbased sorbents including lime, hydrated lime and a mixture of fly ash and hydrated lime is better in the presence of SO2 . The presence of SO2 in the simulated flue gas can enhance the Hg0 capture efficiency from about 15% to 20%, and the adsorption capacity is increased more than 50% at 30min of exposure of sorbents to flue gas. It is found that there is a higher capture effect at higher temperature. It is supposed that heterogeneous reactions of Cabased sorbents and SO2 can increase Hg0 capture , the sites for Hg0 capture are influenced positively by the presence of SO2. The behavior can be correlated with the chemisorption mechanism. The potential of Cabased sorbents used to control Hg and SO2 emissions costeffectively is great.