新型生物质活性炭烟气脱硫研究

Flue Gas Desulfurization by a Novel Biomass Activated Carbon

以农业废弃物核桃壳为原料,天然软锰矿为添加剂共混制备得到的新型生物质柱状活性炭进行烟气脱硫的性能研究.采用固定床反应器进行脱硫实验,装填活性炭质量为16 g,考察了进口SO2含量、空速、床层温度、水蒸气和氧气含量等工艺参数对活性炭脱硫性能的影响.结果表明,进口SO2含量在0.1%～0.3%(体积含量)范围内时,活性炭的穿透硫容和穿透时间随着进口SO2含量的升高而降低;空速越大,活性炭越容易穿透,较佳的空速为600 h-1;最适的床层温度为80℃,过高会降低脱硫效率;水蒸气和氧气的存在大大促进了活性炭对SO2的吸附性能,最佳水蒸气含量为10%,最佳氧气含量为10%～13%.在最佳工艺操作条件下,当进口SO2含量为0.2%时,活性炭穿透硫容为252 mg.g-1,穿透时间可达26 h.

A novel biomass columnar activated carbon was prepared from walnut shell and pyrolusite was added as a catalyst.The activated carbon prepared was used for flue gas desulphurization in a fixed-bed reactor with 16 g of activated carbon.The impact of operating parameters such as SO2 inlet concentration,space velocity,bed temperature,moisture content and O2 concentration on the desulfurization efficiency of activated carbon was investigated.The results showed that both the breakthrough sulfur capacity and breakthrough time of activated carbon decreased with the increase of SO2 inlet concentration within the range of 0.1%-0.3%.The breakthrough sulfur capacity deceased with the increase of space velocity,with optimal space velocity of 600 h-1.The optimal bed temperature was 80℃,and the desulfurization efficiency can be reduced if the temperature continue to increase.The presence of moisture and oxygen greatly promoted the adsorption of SO2 onto the activated carbon.The best moisture content was 10%.When the oxygen concentrations were between 10% and 13%,the desulfurization performance of activated carbon was the highest.Under the optimal operating conditions,the sulfur capacity of activated carbon was 252 mg·g-1,and the breakthrough time was up to 26 h when the SO2 inlet concentration was 0.2%.