置换通风下不同风速对负离子净化PM_(2.5)的研究

Research on the Effect of Different Air Supply Velocities on the Negative Ions Purification for PM_(2.5) under Displacement Ventilation

利用人工环境舱进行实验,从衰减常数、去除率等方面分析了在置换通风下不同送风速度对负离子净化PM_(2.5)的影响。结果表明:负离子对PM_(2.5)具有净化作用;随着送风速度的增加,负离子对PM_(2.5)的净化作用先降低后增大。在保证工作区不会产生吹风感的情况下,所选的8个工况中,置换通风送风速度为0.3m/s左右时,负离子对PM_(2.5)的净化效果最佳,净去除率达到20.4%。

The effect of different air supply velocities on the negative ions purification for PMz.s under displacement ventila- tion has been analyzed from the aspects of attenuation constant and removal rate based on the experimental studies in an en- vironmental chamber. The results show that negative ions have purification effect on PM2.5; with the increase of air supply velocity, the purification effect of negative ions on PM2.5 firstly decreases then enhances. Under the prerequisite of causing no draft risk in the working zone, when the air supply velocity is around 0.3 m/s for displacement ventilation among the eight selected working conditions, the negative ions can perform the best purification function for PM2.5 with the remove rate up to 20.4%.