摘要
湍流凝并技术是通过物理或化学作用促使小颗粒凝并成大颗粒,然后采用传统的除尘技术脱除,从而降低超细颗粒物排放。本文采用欧拉-拉格朗日法结合O’Rouekr碰撞模型,模拟了不同凝并装置结构下,单通道区域内气固两相流的流场与超细颗粒物的凝并过程,比较了两种不同开槽方式下超细颗粒物凝并的效果,进一步优化了凝并元件开槽结构。模拟结果表明,凝并元件开槽可增加入射颗粒沿高度方向的碰撞概率,增强颗粒的凝并效果。采用半圆形槽对凝并元件的开槽方式和位置优化后,通道出口处粒径为2.5μm的超细颗粒物数量占比降低,粒径大于5μm的大颗粒物数量占比和通道出口处颗粒的最大粒径均有所增加,增强了凝并器的凝并效果。
It is an important way to reduce ultrafine particulate emissions by using the turbulence coagulation technology to make small particulate coagulate to larger particulate which can be removed by dust removal device.The gas-solid two-phase flow field and ultrafine particulate coagulation with different slotting structures was simulated,based on the Euler-Lagrange method and O＇Rouekr collision model.A basis for structural optimization of coagulation element was provided.The results show that slotting on the coagulation module can increase the collision chance of particles along the height direction and enhance the particles coagulation.After optimizing the slotting way and location of the coagulation element,the proportion of the ultrafine particles with size of 2.5μm at the passage outlet reduced,while that with size of 5μm and the maximum increased,indicating the coagulation effect was enhanced.
出处
《热力发电》
CAS
北大核心
2016年第1期60-64,共5页
Thermal Power Generation
关键词
超细颗粒物
烟尘排放
湍流凝并
O’Rouekr碰撞模型
凝并元件开槽
结构优化
ultrafine particulate
flue dust emission
turbulence coagulation
O＇Rouekr collision model
slot ted coagulation element
structure optimization
