低温等离子改性复合钙基吸附剂烟气脱硫实验研究

Experimental study on desulfurization from flue gas by calcium-based composite sorbent with non-thermal plasma treated

低温等离子技术对固体吸附剂表面具有明显的改性作用,为研究低温等离子改性对复合钙基吸附剂脱硫的影响,并开发高效的脱硫吸附剂,分别制取了不同比例的活性炭/复合钙基吸附剂(AC/CaO),并在固定床吸附实验台上进行脱硫实验,探究配比、吸附温度、O_2浓度对SO_2吸附效果的影响。在优化的实验条件下,进一步探究低温等离子改性对复合钙基吸附剂脱硫的影响。结果表明,在最佳实验条件下,复合钙基吸附剂对SO_2的单位质量吸附量达到24.89mg/g,大于纯CaO的脱硫效果;通过低温等离子处理后的复合钙基吸附剂拥有更高的SO_2脱除效率,与未改性复合钙基吸附剂相比,单位质量吸附量提高了61.7%;在SO_2和NO的竞争脱除反应中,经过低温等离子改性后,复合钙基吸附剂脱除污染物向着有利于脱除SO_2的方向发展。

Non-thermal plasma technology has significant modification effect on solid adsorbent surface. In order to study the effect of calcium-based sorbent modified by non-thermal plasma on desulfurization and develop a high efficient desulfurization adsorbent, the calcium-based sorbents with different ratios of activated carbon（AC/Ca O）were prepared. The influences of AC to Ca O ratio,adsorption temperature,O_2 concentration on the desulfurization of calcium based sorbent were studied in a fixed bed adsorption test bench. Under the optimized experimental conditions,the effects of non-thermal plasma modification on the desulfurization were further studied. Results showed that the maximum capacity of per mass calcium-based adsorption for SO_2 reached 24.89 mg/g in the optimal experimental conditions,which was greater than the pure Ca O. The calcium-based sorbents treated with non-thermal plasma performed higher SO_2 removal efficiency. Compared with the unmodified calcium-based sorbent,SO_2 adsorption capacity per mass increased by 61.7% through non-thermal plasma modification. There are competitive removal reaction between SO_2 and NO with calcium-based sorbent,however,it was favorable for SO_2 removal after non-thermal plasma modification.