中文摘要：

利用热重分析仪和固定床反应器分别研究了水蒸气对CaCO3煅烧和CaO碳酸化反应的影响,以及吸收剂活性提升机理.结果表明：煅烧气氛中添加水蒸气或氮气可促进CaCO3的分解,且水蒸气促进程度更高,主要是因为水蒸气导热系数高,气固换热量更大,传热效率更高.煅烧气氛中添加水蒸气或氮气都能提升煅烧产物CaO的活性,且氮气提升的程度更高,主要是因为氮气气氛下CaCO3颗粒烧结程度稍低.相比于纯CO2碳酸化气氛,碳酸化气氛中添加水蒸气后,CaO活性提升了近一倍.

英文摘要：

In this study,the effects of steam on CaCO3 decomposition and CaO carbonation reactions were investi-gated by using a thermogravimetric apparatus and a fixed bed reactor.The mechanism of sorbent reactivity enhance-ment was discussed.Introducing steam or N2 into calcination atmosphere promoted the decomposition rate of CaCO3.The promotion extent by introducing steam is higher than by introducing N2.It was mainly due to the higher thermal conductivity of steam.The amount of heat-transfer and the heat-transfer efficiency between steam and CaCO3 particle were higher than those of N2.Both introducing steam and N2 into calcination atmosphere enhanced the reac-tivity of CaO product.The reactivity of CaO generated from N2 calcination atmosphere was higher than that from steam atmosphere,which was due to the lower sintering of CaCO3 particle in N2 calcination atmosphere. Compared with carbonation in pure CO2 atmosphere,the reactivity of CaO was nearly doubled after adding steam into CO2 car-bonation atmosphere.