O_2/CO_2气氛下醋酸调质石灰石直接硫化实验研究  

Experimental Investigation on Direct Sulphation Characteristics of Limestone Modified by Acetic Acid Solution Under O_2/CO_2 Atmosphere

作　　者：武卫芳[1] 赵长遂[1] 李英杰[1] 段伦博[1] 陈惠超[1] 

机构地区：[1]东南大学能源与环境学院,江苏省南京市210096

出　　处：《中国电机工程学报》2010年第26期44-49,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2006CB705806)~~

摘　　要：提出了采用醋酸溶液调质石灰石的方法来提高其直接硫化反应过程中的固硫能力。实验研究了醋酸浓度、温度、SO2浓度等参数对醋酸调质前后2种石灰石在硫酸化过程中钙转化率的影响规律,并采用氮吸附和X射线衍射(X-ray diffractometer,XRD)技术对石灰石及其硫化产物进行了分析。结果表明:调质改善了石灰石的孔结构特性,在直接硫化过程中比原始石灰石具有更高的钙转化率;在所实验的温度范围内,调质石灰石都可获得很高的钙转化率;随SO2浓度增大,直接硫化反应速率升高,调质石灰石钙转化率增大;随醋酸浓度增大,调质石灰石的钙转化率提高,提高幅度因石灰石种类而异,采用浓度为50%醋酸溶液作为调质剂可达到经济高效的目的;XRD图谱验证了醋酸调质石灰石直接硫化时钙转化率更高。Modification of limestone by acetic acid solution was proposed to improve the SO2 capture capability of limestone during sulphation reaction process.The effects of several parameters,in terms of acetic acid concentration,temperature and SO2 concentration,on calcium conversion of limestones and their modified products,calcium acetate（CA） were investigated during sulphation process.Nitrogen adsorption and X-ray diffractometer（XRD） analysis of the limestones and their sulphation products was conducted.The results show that the modified limestone shows higher surface area and pore volume,and its pore size distribution is better than that of raw limestone.The calcium conversion of CA in direct sulphation is much higher than that of raw limestone.CA reaches a high calcium conversion in wide temperature range tested,but the temperature has less substantial effect on the calcium conversion of CA.The reaction rate of direct sulphation increases with increasing SO2 concentration in O2/CO2 atmosphere.The high concentration of acetic acid promotes direct sulphation rate,thus calcium conversion of CA,but different limestone has different effect.The limestone modified by 50% acetic acid solution not only has high calcium conversion,but also gets widespread applicability because of lower cost.The results of the XRD analysis also verify the superior calcium conversion of CA over that of raw limestone during direct sulphation process.

关 键 词：醋酸调质 石灰石 直接硫化 钙转化率 X射线衍射 

分 类 号：X511[环境科学与工程—环境工程]