中文摘要：

利用热重分析仪研究了钙基吸收剂循环脱碳后再脱硫的过程，分析了粒径、碳化循环次数、煅烧条件及水合作用对脱碳和脱硫的影响，并通过扫描电子显微镜观测了各个阶段石灰石样品表面的结构变化．结果表明：硫化对粒径的变化更敏感，粒径越小越有利于反应的进行；循环次数增加和煅烧条件苛刻会显著降低碳化率但对硫化影响较小；水合作用能同时显著提高碳化率和硫化率．新鲜钙基吸收剂煅烧后颗粒表面形成大量球形小颗粒，随着循环次数增加，球形小颗粒融合黏结成鳞片状团聚体，且在团聚体之间形成大孔．水合作用后，样品颗粒表面变粗糙并形成大量宽度不等的裂缝和部分粒径很小的自由颗粒（〈1μm），从而加剧颗粒磨损．微孔结构相同的吸收剂碳化和硫化转化率相差较大，主要是由产物摩尔体积和反应吉布斯自由能变不同造成的．

英文摘要：

The process of using Ca-based sorbent to capture CO2 and SO2 sequentially was investigated on a thermo gravimetric analyzer, so as to analyze the influence of particle size, cyclic number, calcination condition and hydration on the simultaneous capture process, while the surface structure of limestone samples studied at different stages using scanning electron microscopy. Results show that the sulphation is more sensitive to particle size; the smaller the particle size is, the stronger the sulphation reaction will be. Cyclic number and calcination condition play a negative role in carbonation conversion, but affect little on sulphation. The steam hydration benefits both carbonation and sulphation. After calcination of fresh sorbent, small round projections form on the surface, and with the rise of cyclic number, these projections fuse into platy aggregates, when large pores appear. After steam hydration, many differently sized cracks and some free particles of extremely small size （〈1 μm） occur on sample surface, which intensify the sorbent erosion. Sorbent with same microstruetures may have different carbonation and sulphation properties, which are caused by different molar volumes of product and Gibbs free energy change of reaction.