烟气流速对湍流涡旋以及颗粒凝并影响的研究  

Effects of Flue Gas Velocity on the Formation of Turbulent Vortex and the Coagulation of Fine Particles

作　　者：陈亚伟[1] 熊扬恒[1] 潘祖明 周建龙[1] 周盟[1] 

机构地区：[1]武汉大学动力与机械学院,武汉430072 [2]武汉利康能源有限公司,武汉430000

出　　处：《动力工程学报》2017年第5期408-412,共5页Journal of Chinese Society of Power Engineering

摘　　要：采用欧拉-拉格朗日法结合O'Rouekr碰撞模型,模拟了电厂满负荷下静电除尘器前的烟道流速区间内颗粒物的碰撞和凝并.结果表明:凝并器入口烟气流速越大,凝并区的湍流强度和涡量越大,有利于减少细颗粒物的数量,但减少的幅度较小;凝并器入口烟气流速越大,颗粒物在凝并区的停留时间越短,碰撞凝并形成的颗粒物粒径也越小,不利于形成粒径较大的颗粒物,所研究的电厂常见烟气流速范围内凝并器入口烟气流速的提高对湍流凝并的负面作用大于正面作用.A simulation was conducted on the collision and before electrostatic precipitator of a power plant under coagulation of particles flowing in the flue duct full load conditions using Eulerian-Lagrangian method and （YRouekr collision model. Results show that, the higher the flue gas velocity is at the coagula- tor inlet, the larger the turbulent intensity and vorticity will be, which is favorable for the reduction of small particles, but in a limited degree; whereas, the higher the flue gas velocity is at the coagulator inlet, the shorter the residence time of particles will be in the coagulation zone, and the smaller the particles will be formed by collision and coagulation, which is unfavorable for the formation of large particles. Within the common range of flue gas velocity in a power plant, the increase of flue gas velocity at the coagulator inlet has a negative impact stronger than positive impact on the turbulence coagulation.

关 键 词：细颗粒物 烟气流速 颗粒停留时间 湍流凝并 

分 类 号：X513[环境科学与工程—环境工程]