高CO_2浓度下石灰石硫化特性实验研究  

Experimental Study on the Sulfation Characteristics of Limestone Under High CO_2 Atmosphere

作　　者：陈传敏[1] 赵长遂[2] 梁财[2] 庞克亮[2] 

机构地区：[1]华北电力大学环境科学与工程学院,保定071003 [2]东南大学洁净煤发电及燃烧技术教育部重点实验室,南京210096

出　　处：《燃烧科学与技术》2006年第5期453-456,共4页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973)资助项目(G1999022201-04).

摘　　要：借助热重分析天平、扫描电子显微镜、氮吸附仪对石灰石在高CO_2浓度下的硫化特性进行了研究．实验结果表明,高CO_2浓度下石灰石直接硫化时Ca的最终转化率及在高硫化程度时的硫化速率均比CaO-SO_2硫化高很多．测得直接硫化反应由化学反应控制时的表观活化能为93．5 kJ/mol,且表观活化能随Ca转化率的升高而增加．直接硫化所形成的CaSO_4产物层表现出多孔性且比较疏松,而且产物层的比孔容积和平均孔径均随温度的升高而呈指数增长．The sulfation characteristics of limestone with SO2 was investigated under high CO2 partial pressure by thermogravimetric apparatus （TGA）, scanning electron microscopy （SEM） analysis and N2 adsorption method. Direct sulfation of CaCO3 is shown to proceed to high conversion and high sulfation rate at high fractional conversion, in contrast to the sulfation of precalcined limestone （CaO）. An apparent activation energy value for the direct sulfation reaction controlled by chemical kinetics of 93.5 kJ/mol was obtained. And the apparent activation energy increased exponentially with conversion rate increasing. The results show that CaSO4 product layer produced by limestone sulfation in high CO2 atmosphere is more porous and looser than that of CaO sulfation in air. And the specisc pore volume and pore size of sulfated product layers produced by limestone sulfation in high CO2 atmosphere increase exponentially with temperature increasing.

关 键 词：直接硫化 石灰石 O2/CO2气氛 脱硫 

分 类 号：X511[环境科学与工程—环境工程]