横向双极静电除尘器空气动力增效

为明确横向双极静电除尘器的空气动力增效机理,基于电除尘器的经典效率公式研究了空气动力对横向双极静电除尘器除尘效率的影响。数值模拟结果表明：横向双极电除尘器内荷电粒子的驱进速度是电场驱进速度与空气动力驱进速度之和。极板迎风面的空气动力增效幅度强于背风面,而极板背风面的低速回流区是主要的收尘区。实验结果表明：空气动力驱进速度与电场风速呈二次曲线分布关系。电场风速小于1.5 m/s时,气流运动强化了空气动力增效幅度；而电场风速大于1.5 m/s后,二次扬尘作用减弱了空气动力增效幅度。横向双极电除尘器除尘效率修正公式表明：在横向双极电除尘器结构参数一定的情况下,除尘效率受静电力和空气动力的共同影响。

Aerodynamic Enhancement of Bipolar Transverse Plate Electrostatic Precipitator

In order to clarify the aerodynamic enhancement on the bipolar transverse plate electrostatic precipitator (BESP), basing on the classical Deutsch formula of electrostatic precipitator (ESP), the aerodynamic influence on the collection efficiency of BESP was analyzed. The numerical simulation results showed that the migration velocity of charged particles in the BESP was the sum of the electrostatic migration velocity and the aerodynamic migration velocity. The aerodynamic enhancement amplitude of windward side of the plates was stronger than that of the leeward side. Due to the lower speed in the return flow region, the leeward side of the plates were the main dust deposition areas. The experimental results showed that the aerodynamic migration velocity was proportional to the quadratic of the gas velocity. When the wind speed was lower than 1.5 m/s, the aerodynamic migration velocity was strengthened by the gas flow. However, when the wind speed was higher than 1.5 m/s, the aerodynamic migration velocity was reduced by the dust re-entrainment. When the structural parameters were constant, the correction formula of the collection efficiency showed that the collection efficiency of BESP was determined by both electrostatic force and aerodynamic force.