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氧化铁促进石灰中温烟气脱硫的机理性研究   总被引:11,自引:3,他引:8  
本文运用热重分析仪和扫描电镜(SEM)对石灰与氧化铁混合物进行了测定,分析了在200~700℃的中温范围内氧化铁对石灰脱硫过程的促进作用.研究表明;在石灰中掺入一定比例的氧化铁可以显著捉高钙利用率,而且存在最佳氧化铁配比.其作用机理是氧化铁对石灰脱硫不仅具有一定的催化作用,同时还作为活性中心 改变了脱硫产物的形成规律和气体扩散等特性.  相似文献
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氧化铁对石灰中温烟气脱硫活化机理的流化床实验分析   总被引:4,自引:0,他引:4  
运用小型热态流化床对石灰与氧化铁混合物的中温烟气脱硫反应特性再次进行了分析。研究表明:在石灰中掺入一定比例的氧化铁可以显著提高钙利用率,氧化钙晶粒以氧化铁颗粒为核心进行固硫反应,破坏了形成表层致密产物层的条件,改变了石灰表层孔隙结构,使更多的内部孔隙暴露,为同硫反应向纵深发展创造了条件。  相似文献
3.
A novel nano-porous material SiO2-gel was prepared. After being purified by H2O2, then protonized by H2SO4 and desiccated in vacuum, the SiO2-gel, mixed with Nation solution, was coated between an electrode and a solid electrolyte, which made a new type of self-humidifying membrane electrode assembly. The SiO2 powder was characterized by FTIR, BET and XRD. The surface of the electrodes was characterized by SEM and EDS. The performances of the self-humidifying membrane electrodes were analyzed by polarization discharge and AC impedance under the operation modes of external humidification and self-humidification respectively. Experimental results indicated that the SiO2 powder held super-hydrophilicity, and the layer of SiO2 and Nation polymer between electrode and solid electrolyte expanded three-dimension electrochemistry reaction area, maintained stability of catalyst layer and enhanced back-diffusion of water from cathode to anode, so the PEM Fuel cell can generate electricity at self-humidification m  相似文献
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