基于双流体模型的烟气喷动床脱硫过程的数值模拟

以气固两相流体动力学为基础，采用欧拉双流体模型及颗粒动力学理论，引入复相催化脱硫反应动力学模型，对喷动床应用活性炭颗粒脱硫的过程进行模拟。获得了喷动床具有喷射区、环隙区和喷泉区的流动状态，分析了床内气目的速度矢量分布及SO2质量分数的分布情况。结果表明：喷动床内环隙区脱硫效果最好，且流经环隙区烟气量占总进气量的60％-859／6，说明喷动床内特有的流动状态有利于烟气的脱硫。当表观速度由1.099m／s减小到0.732m／s时，喷动床的脱硫效率提高25％。因此在保证喷动床稳定工作的情况下，适当减小入口的烟气速度，有利于提高活性炭喷动床的脱硫效率。

Numerical simulations of flue gas desulfurization in a spouted bed based on two-fluid model

Activated carbon aided desulfurization in a spouted bed reactor was modeled by two-phase,gas-solid fluid dynamics and Euler-Euler two fluid models.Overall flow patterns were determined that included the stable spout region,the fountain region,and an annular region within the bed.The distribution of the velocity vector for two-phase flows was obtained.The mass fraction of SO2 was also predicted.The predictions show that the desulfurization rate is fastest in the annular region.The gas flux through the annular region contributes from 60 to 85% of the total gas flux.Hence the unique flow structures in a spouted bed are advantageous for enhancing desulfurization.Although the superficial velocity decreased from 1.099 to 0.732 meters per second the desulfurization efficiency increased by 25%.Reduced injection rates can improve desulfurization efficiency if the engineering ensures that the three stable regions are formed in the spouting bed.