作　　者： (王林）; (高继慧）; (车宏伟）; (井新径）; (李阳）; (罗志）;

机构地区： 西安热工研究院有限公司,陕西西安710054

出　　处： 《热力发电》 2017年第9期124-129,共6页

摘　　要： 利用共沉淀法设计制备了晶格内掺有不同半径杂离子的CaO吸收剂,研究了杂离子类型对脱硫反应的影响;基于离子晶体内原子扩散的空位缺陷理论,获得了掺杂不同半径离子对硫化产物层离子扩散影响的整体规律,并利用傅氏转换红外线光谱分析仪(扫描电子显微镜)和X射线衍射仪对掺有不同半径杂离子的CaO吸收剂进行分析。结果表明:掺杂Ba^(2+)后的CaO吸收剂脱硫性能最佳,而掺杂Mg^(2+)的效果最差;设计样品中实现了杂离子与Ca^(2+)原子水平的掺混;杂原子掺入引起了CaO相应的晶格畸变,大半径杂离子能增加晶体中的空位点缺陷数量,提高吸收剂脱硫性能,而小半径杂离子则对产物层固态离子扩散无促进作用。 By co-precipitation method, CaO sorbents in which Ca2＋ and hetero-ion （with different radius） were mixed in the crystalline lattice were prepared.The effect of hetero-ion type on desulfurization reaction was studied. On the basis of the vacancy defect theory in solid-state ions diffusion, the comprehensive rules about ion-doping promoting ion diffusion in sulfated product layer were obtained. The Fourier transform infrared spectroscopy （FTIR） and X-ray diffractometer were used to analyze the desulfurization performance of each sample. The result show that, the samples mixed with Ba2＋ has the best desulphurization performance, while that with Mg2＋ has the worst. The dopant ions were successfully mixed with Ca2＋ at atom level. The dopant ions brought in lattice distortion. It concluded that the dopant ions which have a larger radius can increase the number of space point defects and improve the desulfurization ability of the sample, but the smaller radius dopant ions have no positive effect.

关 键 词： 共沉淀法 离子掺杂 氧化钙吸收剂 脱硫 空位缺陷 固态离子扩散 脱硫性能