微波改性活性炭用于烟气脱硫脱硝的实验研究

在用浓硝酸、氢氧化钾化学改性活性炭的基础上,使用专门设计的微波发生器对活性炭进行热处理,制备了一种高效的活性炭吸附剂用于烟气脱硫脱硝。改性活性炭对模拟烟气的吸附实验表明,活性炭经微波改性后的脱硫吸附量明显提高,氢氧化钾浸泡加微波改性的脱硫效果最好,浓硝酸浸泡加微波改性的活性炭对氮氧化物也有比较好的吸附效果,NO的吸附容量可达到36.8×10-3。扫描电镜(SEM)显示,微波改性后的活性炭微孔充分,有利于污染物的脱除。此外,还对各种改性方法提高活性炭脱硫脱硝性能的机理进行了分析。

Experimental study on desulfurization and denitrification from flue gas over modified activated carbon using microwave irradiation

On the basis of improving adsorption capacity of the activated carbon (AC) modified by high concentration HNO₃ and KOH solution, a special microwave device was designed for further modification of AC by the heat treatment, and a kind of highly active carbon sorbent used for combined flue gas desulfurization and denitrification was prepared. Through the adsorption experiment in the simulating flue gas using modified AC, it is found that the modified AC under microwave irradiation evidently increases the adsorption capacity of SO₂, and the best removal efficiency can be obtained with the AC pretreated by KOH solution and modified by microwave. The experiments indicate that the AC pretreated by high concentration HNO₃ and microwave irradiation has a better removal of NO with the adsorption capacity of 36.8×10^-3. The SEM pictures show the numbers of the micropores increase clearly, which is in favor of removal of pollutants. The mechanism of removing SO₂ and NO with various modified methods was analyzed simply in the paper.