【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。图10表2参15更多还原

【Abstract】 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 σ² reduces quicker in a O₂/CO₂ atmosphere under 850（°C） 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.更多还原