【摘要】 通过分析荷电颗粒在气相流场耦合电场中的受力情况,计算出颗粒在有效除尘空间内的运动轨迹,并推导出颗粒的捕集效率表达式。结果表明:在温度为350~700℃、端口电压高于15 900V的条件下,计算与实验结果符合较好,最大相对误差小于9%;当气流平均速度大于0.2m/s时,应考虑阴极线的边界作用;相同直径的颗粒在电场中的初始位置不同时,驱进速度差异很大;提高端口电压可减小除尘器需求高度,以620℃、10μm的颗粒为例,除尘效率达到100%,端口电压为15 925V时,需要的有效除尘器高度约为0.86m,而端口电压为19 200V时,需要的有效除尘器高度约为0.42 m;在进入电场时,颗粒的初始位置在阴极线或阳极管附近时,更易被捕集。更多还原

【Abstract】 By analyzing the force condition of charged particles in gas flow field coupled with electric field,the particle trajectory in effective collection space was calculated,so as to derive the formula for collection efficiency of particles.Results show that the calculation results agree well with experimental data at the temperature of 350-700 ℃ with port voltage greater than 15 900 V,when the maximum relative error is less than 9%.The boundary effect of cathode line should be considered in the case of mean gas velocity being larger than 0.2 m/s.For particles with same diameter,the migration velocities differ a lot when their initial positions are different in the electric field.The required height of precipitator reduces with the rise of port voltage;taking the particle of size 10μm as an example,to reach the collection efficiency of 100%at the temperature of 620 ℃,the required height is about 0.86 mfor a port voltage of 15 925 V,which is about 0.42 m when the port voltage gets up to 19 200 V.A particle is more likely to be captured when entering the electric field,if its initial position is in the vicinity of cathode line or anodic tube.更多还原