烟气组分对氯化铵改性活性炭汞吸附特性的影响

Effect of Flue Gas Components on Mercury Adsorption by Ammonium Chloride Modified Activated Carbon

选取一种商业活性炭,采用质量分数为1%的NH_4Cl溶液对其浸渍改性,在固定床汞吸附实验台上研究了烟中O_2、CO_2、SO_2、NO、HCl等组分及各组分体积分数对改性后活性炭吸附脱汞的单一影响规律。结果表明:O_2、CO有一定促进作用,且随O_2和CO_2体积分数升高,促进汞脱除效果逐渐增强;不同体积分数SO_2气氛对NH_4Cl改性性炭汞吸附能力的影响均呈现先促进后抑制的趋势;NO、HCI能提高NH_4Cl改性活性炭吸附脱汞的能力,但脱汞能力NO、HCl体积分数变化不敏感。

A kind of commercial activated carbon was chosen that was modified by 1% ammonium chloride solution. Effect of flue gas components （O2, CO2, SO2, NO, HC1） and their volume fraction on mercury removal by the modified activated carbon was investigated in a fixed-bed reactor. The results show that O2 and CO2 can partly promote the modified activated carbon＇s mercury removal rate. In addition, the mercury removal efficiency increases along with O2 and CO2 volume fraction. In the atmosphere of different SO2 volume fraction, the mercury removal capacity of modified activated carbon is firstly improved but inhibited soon afterwards. Both NO and HC1 can also enhance the mercury adsorption ability of modified activated carbon, which, however, is insensitive to the change of NO or HC1 volume fraction.