型煤燃烧中改性活性氧化铝的固硫效果  

Sulfur Retention Effect of Modified Activated Alumina During Briquette Combustion

作　　者：李军[1] 许树栋 张红超[1] 王露[1] 李朋[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京高级工程师100083

出　　处：《煤炭转化》2017年第3期59-63,共5页Coal Conversion

摘　　要：基于等体积浸渍法和固硫理论,研究了以表面负载不同金属氧化物的活性氧化铝作为型煤添加剂的固硫效果,并通过SEM分析和XRD分析,分别考察了不同活性氧化铝的孔结构变化、原煤煤灰和负载CaO的活性氧化铝型煤煤灰的物相变化.结果表明:活性氧化铝和负载不同金属氧化物的活性氧化铝对型煤燃烧中SO_2减排效果由高到低依次为负载CaO的活性氧化铝、负载CuO的活性氧化铝、负载BaO的活性氧化铝和活性氧化铝.通过SEM分析发现,活性氧化铝改性后提高了孔结构的热稳定性.通过XRD分析发现,负载CaO的活性氧化铝在型煤燃烧过程中会与SO_2反应,生成耐高温络合物3CaO·3Al_2O_3·CaSO_4,阻碍了部分CaSO_4的分解,从而提高了其固硫性能.经实验对比发现,负载CaO的活性氧化铝的固硫效果比传统固硫剂CaO更优.Based on the isometric impregnation and the theory of sulfur-fixation, the sulfur retention of activated alumina as briquette additive and loading with different metal oxides on the surface was studied. The changes of pore structure before and after modification were analyzed by using SEM, and the changes of phase transformation of raw coal ash and briquette ash were analyzed by using XRD, while activated alumina loading with CaO was used as the briquette sulfur fixing agent. The results show that the effect on reduction of SO2 emission by activated alumina loading with different metal oxide is activated alumina loading with CaO~ activated alumina loading with CuO〉 activated alumina loading with BaO〉 activated alumina. The SEM analysis shows that loading different metal oxides on the surface of activated alumina has improved its heat stability. It is found by using XRD that CaO loading on activated alumina can react with SO2 and generate 3CaO · 3Al2O2 · CaSO4 with thermostability, which hinders the decomposition of CaSO4, thus can improve the sulfur retention effect. Compared with the sulfur retention effect of CaO, the sulfur retention effect of modified activated alumina is better in the experiment.

关 键 词：型煤 固硫剂 活性氧化铝 改性 CAO 

分 类 号：X701.3[环境科学与工程—环境工程]