摘要
工业锅炉最经济的烟气脱硫温度为 1 2 0℃～ 2 50℃ ,而绝大多数干法脱硫剂在该温度窗口却无法高效脱除烟气中 SO2 .为制备该温度具有高脱硫活性的炭载性脱硫剂 ,分别对活性焦担载不同金属制备的脱硫剂在 2 0 0℃的脱硫活性进行了评价 .结果表明 :Cu/AC脱硫剂对 SO2 具有高的吸附硫容和较快的吸附速率 ,且饱和 SO2 后脱硫剂可在惰性气氛中 ,于较低的温度下被载体炭还原再生 .通过对不同载铜量 Cu/AC脱硫剂的活性评价以及 TPR和 TPO表征 ,发现不高于5% ( wt.)的载铜量 ,活性组分 Cu O在 AC表面具有高的分散性 ,只存在表面 Cu O;载铜量增至7% ( wt.) ,脱硫剂开始出现体相 Cu O,且随载铜量的继续增加 ,体相 Cu O所占的比例明显增加 ,表面 Cu O因与载体炭良好的相互作用 ,呈现高的脱硫活性 ;而体相 Cu O低温下较难与 SO2 进行反应 ,故过高的 Cu
The most preferable temperatures of the SO 2 removal from flue gas of industrial boilers are between 120 ℃ and 250 ℃.In order to prepare highly active desulfurizers at this temperature window,the activities of many carbon supported metal desulfurizers are investigated at 200 ℃.The Cu/AC desulfurizers show the highest sorption capacity for sulfur dioxide,fast sorption rate,and the desulfurizers saturated with sulfur dioxide are easily regenerated in inertial gas stream at lower temperature by reduction of support carbon.through TPR and TPO techniques,it is found that the CuO in the Cu/AC desulfurizers with a loading of no higher than 5% highly dispersed on the surface of AC,only surface CuO species existing,and that the bulk CuO begin to appear for the desulfurizers with a loading of 7%.The ratio of bulk CuO to surface CuO increases with the loadings.At 200 ℃,the surface CuO can easily react with SO 2 ,and the bulk CuO can not.Therefore,excessively high Cu loading is unfavourable to sulfur dioxide removal.
出处
《煤炭转化》
CAS
CSCD
2000年第2期53-58,共6页
Coal Conversion
基金
国家自然科学基金重点项目 !(29633030)
关键词
炭载型
脱硫剂
载铜量
活性炭
锅炉
烟气脱硫
carbon supported desulfurizers,copper loading,characterization,TPD,TPR,TPO
