助剂对CaSO_4载氧体化学链燃烧的影响  

Effect of Additives on CaSO_4 Oxygen Carrier in Chemical-looping Combustion

作　　者：丁宁[1] 郑瑛[1] 罗聪[1] 郑楚光[1] 

机构地区：[1]煤燃烧国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》2011年第5期40-47,共8页Proceedings of the CSEE

基　　金：国家重点基础研究专项经费项目(2006CB705807);国家自然科学基金项目(50936001;50721005;50676038)~~

摘　　要：在固定床实验台架上,研究了CaSO4和添加助剂的CaSO4与气体燃料发生反应的特性。结果表明:助剂可大幅度地提高CaSO4的反应活性,缩短反应时间。在950℃下,所有复合载氧体的转化率均超过95%。在还原和氧化过程中,载氧体释放的SO2曲线呈单峰特性,且随温度显著增大;温度对COS的释放没有明显的影响作用。含Ni-Fe的载氧体等转化率下硫的损失率最小。通过程序升温还原、X射线衍射和场发射扫描电镜等表征分析,研究了样品的反应性能,成分与结构变化,并提出了一个可能的催化还原反应和硫释放机制。he experimental research was carried on the fixed bed reactor, investigating the reactions between gaseous fuel and oxygen carriers, which were made by impregnating CaSO4 with additives. The results indicate that additives can greatly improve the activity of CaSO4 and shorten the reaction time. The conversion rates of all compound oxygen carriers are more than 95% at 950℃. The curves of sulfur dioxide show single peak characteristic, and obvious increase with temperature during the reduction and oxidation process. Temperature has no obvious effect on the release of COS, and sulfur loss of the Ni-Fe compound oxygen carrier is minimum under the same conversion. Reactivity, component and structure changes of samples were studied by using temperature programmed reduction （TPR）, X-ray diffraction （XRD） and field emission scanning electron microscope （FSEM） measurements, and a possible mechanism of catalytic reduction and sulfur release is proposed.

关 键 词：化学链燃烧 复合载氧体 硫酸钙 助剂 硫释放 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]