烟道折流板对磁珠吸附剂喷射脱汞影响的数值模拟

Numerical simulation on influence of flue baffle on mercury removal by magnetospheres sorbent injection

为探究烟道设置折流板后的吸附剂喷射效果,利用Fluent软件进行CFD仿真模拟,选取k-ε双方程湍流模型、欧拉-拉格朗日离散相模型和组分方程,探究折流板在不同布置情况下的颗粒截面覆盖率、截面最大浓度、颗粒停留时间、烟道出口颗粒质量浓度以及烟道前后压降,并以此评判颗粒物的扩散效果。研究结果表明:当喷管数为2个或3个时,颗粒的扩散效果最好。选取2组喷管,磁珠喷射后对烟道内部的压力、速度、温度流场并无明显影响,同时可保证较高颗粒覆盖率,从而为磁珠喷射装置的布置提供参考。

In order to explore the effect of adsorbent injection in flue with baffles,Fluent software was used for CFD simulation.The k-εdouble equation turbulence model,Eulerian-Lagrangian discrete phase model and component equation were selected to explore the particle cross-section coverage,the maximum cross-section concentration,particle residence time,particle mass concentration at flue outlet and pressure drop before and after flue under different arrangements of baffles,which was the evaluation index of the diffusion effect of particles.The results show that when the number of nozzles is 2 or 3,the effect of particle diffusion is the best.When two groups of nozzles are selected,there are no obvious influence on the pressure,velocity,temperature and flow field inside the flue after magnetospheres sorbent injection.At the same time,the high particle coverage can be ensured,which provids a reference for the layout of the magnetospheres sorbent injection device.