Abstract: The transport-reaction process characteristics during product layer formation in flue gas desulfurization was studied theoretically and experimentally.The transport-reaction process could be described by Thiele number incorporating the influences of chemical reaction resistance and diffusion resistance.It was found that the conversion rate at the end of the process decreased with increasing Thiele number.The conversion rate increased with increasing temperature and porosity, and also depended upon pore geometry and distribution.

Key words:

气固反应, 传质-反应, 脱硫, 蒂勒数（Thiele数）

摘要： 主要分析脱硫反应中形成产物层之前的传质反应特性.研究发现，可用蒂勒（Thiele）数来描述以同时反映化学反应速率、扩散速率的影响.脱硫剂颗粒形成产物层之前的转化率仅由蒂勒数决定，随其增加而降低，与此阶段持续时间无关.分析表明，颗粒半径、孔隙率、孔隙分布方式等都可能会改变在产物层形成过程中的转化率和过程特性.粒径较小时，产物层形成过程的转化率随粒径增大而降低；粒径增大到一定程度后，在较大粒径范围内转化率基本不随粒径变化而变化；孔隙率越大，形成产物层时转化率越高.

关键词:

气固反应, 传质-反应, 脱硫, 蒂勒数（Thiele数）