原料半焦和FeCl_3改性半焦脱除模拟烟气中气态Hg^0的实验研究

Experimental Study on Adsorption Performance of Semi-coke and Semi-coke Modified by FeCl_3 Solution for Gas-phase Hg^0 in Flue Gas

在固定床实验台上,利用内蒙古霍林河褐煤半焦及其改性半焦对模拟烟气中的气态Hg0进行吸附实验。结果表明:与原料半焦相比,在140℃下、经FeCl3溶液改性半焦吸附效率有明显提高,并且长时间维持在90%以上;改性半焦对气态Hg0具有较高的吸附稳定性。BET测试结果表明,半焦经FeCl3溶液处理后,孔道发生部分堵塞或破坏,使得半焦的孔隙结构发达程度有所降低;XRD测试表明,改性半焦中无定形炭的结构并未发生变化,表面Fex Oy以高度分散的无定形状态存在;FTIR分析结果表明,FeCl3溶液处理使半焦表面O—H官能团和C O官能团的含量增加。

The adsorption performance of semi-coke and FeCI3 solution-modified semi-coke for gas-phase H^0 was in- vestigated with a bench-scale fixed-bed reactor system. The experimental results suggest that the adsorption per- formance of FeCI3 solution-modified semi-coke for gas-phase Hg^0 presents better than semi-coke. The samples im pregnated by FeCI3 solution have excellent adsorption performance which can get 90% for gas-phase Hg^0 at 140 ~C in a long time. FeCI3 solution-modified semi-coke for gas-phase Hg^0 is more stable. The BET analysis shows that semi coke has rich mesopore but become weak after modification. The XRD results indicate that the structure of the amorphous carbon in FeCI：, solution-modified semi coke is not changed and the trace of FexO3 exists as the highly fragmented amorphous state in the surface of modified semi-coke. The FTIR results indicate that the surface of FeCI：, solution-modified semi coke have more O--H functional group and C = O functional group than semi coke.