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CaCO_3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CaCO_3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CaCO_3颗粒烧结程度稍低.相比于纯CO_2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.
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.
作者
李泽华
杨竞择
牛少博
汪印
姚洪
Li Zehua Yang Jingze Niu Shaobo Wang Yin Yao Hong(State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China)
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2016年第4期311-316,共6页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(41373092,51476065)
华中科技大学技术创新基金资助项目(CX14-038)
关键词
水蒸气
CACO3
分解率
换热量
CAO
活性
CaO
steam
decomposition rate
amount of heat-transfer
CaO
reactivity
