脱硫吸收塔深度除尘机理研究
Research on the mechanism of deep dust removal in desulfurization absorber
姜雅洲 1邓丽萍 1刘文榉 1葛春亮1
作者信息
- 1. 浙江浙能科技环保集团股份公司,浙江 杭州 311100
- 折叠
摘要
本文研究了石灰石-石膏湿法脱硫塔内气液固三相介质流场中亚微米级和微米级颗粒物的深度除尘机理.采用欧拉-离散相模型模拟单液滴对颗粒物的捕集过程,分析不同粒径颗粒在脱硫塔内的分布和捕集情况.针对亚微米级颗粒,研究结果显示,脱硫塔内的主导捕集机制为热泳捕集,而惯性捕集、拦截捕集作用相对较弱;增加气液两相温差有助于提高脱硫塔对亚微米级颗粒的脱除效率.对于微米级颗粒,惯性捕集成为最主要的机制,其捕集效率受到气液相对速度和液滴体积分数的影响.增大气液相对速度和液滴体积分数可以提高脱硫塔对微米级颗粒物的脱除效率.
Abstract
In this paper,the mechanism of deep removal of submicron and micron-sized particles in the gas-liquid-solid three-phase flow field inside a limestone-gypsum wet flue gas desulfurization(FGD)tower was investigated.The Eulerian-Lagrangian model was used to simulate the particle capturing process of single droplet,and the distribution and capturing of particles with different sizes in FGD tower were analyzed.The results show that,for submicron particles,the dominant mechanism on particle capturing in FGD tower is derived from thermophoresis effect,while inertial capture and interception capture are relatively weak.Increasing the temperature difference between gas and liquid phases can improve the removal efficiency of submicron particles in the FGD tower.For micron-sized particles,inertial capture becomes the main mechanism,and its capture efficiency is affected by the relative velocity of gas to liquid phases and the volume fraction of droplets.Increasing the relative velocity of gas to liquid phases and the volume fraction of droplets can improve the removal efficiency of micron-sized particles in the FGD tower.
关键词
气液固三相介质流场/亚微米级颗粒/微米级颗粒/深度除尘机理/欧拉-离散相模型Key words
gas-liquid-solid three-phase flow field/submicron particles/micron-sized particles/deep removal mechanism/Eule-rian-Lagrangian model引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据