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.
出处
《动力工程学报》
CAS
CSCD
北大核心
2017年第5期408-412,共5页
Journal of Chinese Society of Power Engineering
关键词
细颗粒物
烟气流速
颗粒停留时间
湍流凝并
fine particles
flue gas velocity
particle residence time
turbulence coagulation
