异极性荷电粒子的磁凝并系数建模分析

Magnetic Coagulation Coefficient of Bipolar Charged Particles

针对非磁性以及弱磁性的非金属粉尘磁凝并效果差的问题,首次提出了异极性荷电粒子在磁场洛伦兹力作用下凝并的方法。即带正负相反电荷的粒子以一定的速度进入磁场,在洛伦兹力的作用下,分别沿着不同圆周顺时针或逆时针的方向运动,从而碰撞凝并。建立了带电粒子在磁场洛伦兹力作用下凝并的数学模型,求出了凝并系数表达式。通过对凝并系数仿真分析得出:有外加磁场(磁感应强度为0.5 T)情况下的PM10的凝并系数比无外加磁场情况下的PM10凝并系数大33%左右。带电粒子的磁场凝并系数与磁感应强度、粒子粒径、气流速度成正相关,与粒子密度成负相关。

A method of charged particles coagulating in magnetic field under Lorentz force was put forward, focusing on solutions to the problem of poor coagulation effect of non-metallic dusts which are nonmagnetic or weak magnetic. When the particles with opposite polarity charges at a certain speed enter the magnetic field under the action of Lorentz force, going along the different circle clockwise or counterclockwise direction respectively, there will appear the collision and coagulation. With the coagulation model being developed in this study, the coagulation coefficient expression was obtained; and through the simulation, it was found the coagulation coefficient of PM10 under the magnetic field was greater than that without additional magnetic field by about 33%. Furthermore, magnetic coagulation coefficient of electrically charged particles was positively correlated with magnetic induction intensity, particle size and air velocity; however, was negatively correlated with particle density.