在O_2/CO_2-空气两种不同气氛下石灰石硫化特性的比较  

Comparison of Characteristics of Calcium-Based Desulfurization in Air and in an Atmosphere of O_2/CO_2

作　　者：刘彦[1] 韦宏敏 齐学义[3] 徐江荣[1] 李德忠[4] 周俊虎[5] 岑可法[5] 

机构地区：[1]杭州电子科技大学理学院,杭州310015 [2]浙江中控技术股份有限公司,杭州310053 [3]兰州理工大学流体动力与控制学院,兰州730050 [4]华中理工大学能源与动力工程学院,武汉430074 [5]浙江大学热能工程研究所,杭州310027

出　　处：《动力工程》2006年第2期267-272,共6页Power Engineering

摘　　要：热重分析表明:石灰石在O2/CO2-空气两种气氛下煅烧及硫化特性显示出较大差异。在O2/CO2气氛中,因较高CO2浓度使石灰石的煅烧分解推迟,一定条件下石灰石直接与SO2发生硫化反应,且过程具有较高的反应速率。通过对硫化样品的压汞仪孔隙结构分析及SEM、XRD测试,同时采用不反应缩核模型分析比较两种硫化过程的动力控制特性,得出与传统空气条件相比,在850°C、O2/CO2气氛下硫化反应的σ2数值减少较快,产物层的扩散阻力对反应的影响相对减弱,更有利于反应深入发展的结论。According to thermogravimetric analysis, calcination and sulfation of limestone shows notably different characteristics in air and in an O2/CO2 atmosphere. In an O2/CO2 atmosphere, because the relatively high CO2 concentration retards the calcination decomposition process of limestone, the latter, under certain circumstances, enters the CaCO3-SO2 sulfation reaction directly, and in addition, does so with a relatively high rapidity. Analyses of the porous structure of sulfated samples by the Pore Master method and SEM, XRD tests, together with a comparison of the dynamic control characteristics of the two processes of sulfation by using unreacted shrinking core models, show that, compared with the traditionally used atmospheric condition of air, the sulfation reaction index O2 reduces quicker in a O2/CO2 atmosphere under 850 ℃ temperature and the influence, of diffusion resistance of the product layer, on the reaction is reduced, which stimulates the reaction to proceed quicker. Figs 10, tables 2 and refs 15.

关 键 词：环境工程学 O2/CO2气氛 控制机理 钙基脱硫 不反应缩核模型 

分 类 号：X511[环境科学与工程—环境工程]