Application and numerical simulation of negative ion dust removaltechnology in tunnels

Taking the Wulong Tunnel as an example, a portable negative ion generator is used for field testing to verify the consumption of negative ions and the effectiveness of dust removal. This study simulates the dust removal effect of the negative ion purification system applied to the Wulong Tunnel. The results show that the electric field in the tunnel is distributed in a ring shape with the electrode as the center and continues to expand outward. As the particle size of the dust particles increases, the charge quantity increases, and the dust particles are more likely to deviate under the action of the electric field force. When the action time is 600 s, the removal rates for the dust with particle sizes of 2.5 μm and 10 μm are 63.57% and 99.00%, respectively. Increasing the working voltage can effectively improve the dust removal rate.