摘要
矿物碳酸化是一种很有潜力的CO_2地质隔离储存技术.在缺乏反应动力学参数的条件下,矿物碳酸化理论及热力学分析有助于了解CO_2矿物碳酸化反应进程并确定反应发生的温度与压力区间.本文从热力学角度研究结果表明,CO_2可以与部分硅酸盐矿物进行碳酸化反应得到碳酸盐和二氧化硅.相对于干法碳酸化,湿法碳酸化具有高反应速率和低能耗等优点。硅酸盐矿石的溶解与溶液中的HCO_3^-浓度有关,反应开始前溶液中加入一定量的碳酸氢盐能够促进硅酸盐矿石的溶解。CO_2矿物化隔离,硅灰石优于蛇纹石,蛇纹石优于镁橄榄石。在温度低于500 K及较高的反应压力范围内,CO_2矿物碳酸化具有商业化应用潜力.
Mineral carbonation is a potential technology for CO2 sequestration. Because of the lack of reaction kinetics parameters, the theoretical and thermodynamical analysis of mineral carbonation can help to understand the process of carbonation reaction and to determine the temperature and pressure ranges in which the reaction happens. Investigating from a view of thermodynamics, the results show that CO2 could react with several minerals, producing carbonate and silicon dioxide. Compared with dry carbonation, the wet method has a higher reaction rate and consumes less energy. The dissolution of silicate is related to the concentration of HCO3^- in the solution. Adding some hydrocarbonate before the reaction happens could promote the dissolution of the silicate used. To mineral carbonation for CO2 sequestration, wollastonite is better than serpentine, and serpentine better than forsterite. Thermodynamically, the mineral carbonation reaction could be implemented under higher pressure when the reaction temperature is lower than 500 K.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2008年第6期1063-1068,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.40672098
No.50721005)
国家重点基础研究发展规划项目(No.2004CB217704)
关键词
二氧化碳
矿物碳酸化
碳隔离
煤燃烧
carbon dioxide
mineral carbonation
carbon sequestration
coal combustion
