钙基复合载氧体反应性能的研究  

Experimental Study on Reactivity of Calcium-based Compound Oxygen Carriers

作　　者：丁宁[1] 郑瑛[1] 罗聪[1] 郑楚光[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《动力工程学报》2010年第9期689-694,698,共7页Journal of Chinese Society of Power Engineering

基　　金：国家重点基础研究发展规划资助项目(2006CB705807);国家自然科学基金资助项目(50936001;50721005;50676038)

摘　　要：采用沉淀法制备了3种钙基复合载氧体,并在固定床试验台架上对复合载氧体与CO的反应性能进行了研究.对反应前后的载氧体进行了X射线衍射(XRD)和场发射扫描电镜(FSEM)表征分析.结果表明:3种添加物均能促进CaSO4与CO的还原反应,提高载氧体的反应速率和转化率;3种添加物对COS的释放具有抑制作用,La添加物对SO2的释放有一定的抑制作用,而Ti、Ni添加物促进了SO2的释放;添加Ni的载氧体具有较高的反应活性,表现出良好的循环特性;载氧体在1次循环反应后,固相中出现了少量的CaO;在6次循环反应后,CaO的峰值比第1次循环后的峰值高,载氧体表面由平整光滑变得疏松多孔,且分布均匀.Reactivity between any of three calcium-based compound oxygen carriers and CO was investigated in a fixed bed. The three compound oxygen carriers, prepared using precipitation method, were characterized by XRD and FSEM techniques before and after corresponding reactions. Results show that all the three additives adopted for preparation of above oxygen carriers, can promote the reduction reaction of CaSO4 with CO, improve the reaction and conversion rate, but inhibit the release of COS. La additive may inhibit, but Ti and Ni additive accelerate the release of SO2. Among the three oxygen carriers, the one with Ni additive has the best reactivity and cycle performance. Small amount of CaO will appear in the solid phase of oxygen carrier after the first cycle of reaction, and after six cycles, the CaO peak will be higher than that after the first cycle, and the surface of oxygen carrier will change from original smooth state into coarse structure, with many pores evenly distributed.

关 键 词：化学链燃烧 钙基复合载氧体 添加物 反应性能 硫释放 循环反应 

分 类 号：TQ546[化学工程—煤化学工程]