摘要
针对目前电除尘技术尚属于经验工程的学科,由设计命中率决定的电除尘器技术性能难以达到烟气排放的新标准。为提高电除尘器的效率,根据电离连续方程及带电粒子运动方程,模拟电除尘技术中直流高电压电晕放电的物理过程,进行了大气压电晕电场中的带电粒子输运特性实验。当电晕放电电场强度为38.4 Td,粒子动量由72 ygm/s增加到1195 ygm/s时,负离子输运项(控制电离区域离子在输运过程中引起浓度变化的速率)则相应地由5.4×108/(cm3.s)升高到8.0×1010/(cm3.s),增加了2个数量级。结果表明可通过提高粒子动量解决现代电除尘器的离子浓度。
The new standard published in 2004 by China Government can not meet the requirements of the performanee of existing electrostatic precipitation, so more attention should be paid to the theory and technology. To improve efficiency of electrostatic precipitation, the physical process of DC high voltage corona discharge in electrostatic precipitation is simulated based on kinematics equation of charged particle; the experiments with motion law of charged particle in atmospheric pressure corona discharge electric field are conducted. When the momentum of gas particle is 1200 ygm/s, energy density of discharge increases from 0. 005 μJ/cm^3to 3. 2μJ/cm^3 , the ionic transport item increases with it from 6. 5×10^4/（cm^3· s） to 8.0×10^10/（cm^3 · s） ; when the intensity is 38. 4 Td, momentum of particle increases from 72 ygm/s to 1195 ygm/s, the ionic transport item increases 2 orders of magnitude from 5. 4 ×10^8/（cm^3 · s） to 8.0× 10^10/（cm^3 · s）. The results show that the problem of low ion concentration in modem electrostatic precipitation can be solved through increasing momentum of particles. It is beneficial to improving the technical performance of electrostatic precipitation.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2007年第2期182-185,共4页
High Voltage Engineering
基金
国家自然科学基金资助项目(60471036
50578020)
关键词
电除尘
电离放电
输运特性
注入能量密度
粒子动量
electrostatic precipitation
ionization discharge
transportation characteristic
input power density
particle momentum
