抄録
One of the applications of the ESP is the cleaning of the air to increase the visibility index in highway tunnels. Most of particles in the highway tunnels are composed of carbon. Decrements of the collection efficiency due to particle agglomeration on the electrode and re-entrainment phenomena are important problems when ESP collects carbon particles that are low electric resistivity. In the previous experiments, the coarse particles on the collecting electrode accumulated on midpoint of the collecting electrode. Generally, almost collected particles start accumulating from the upstream area on the collecting electrode surface. In this work, the particle collection was observed in real time because of clearing for the behavior of collected particles. And then, particle collection and particle huge re-entrainment phenomena processes were observed. In the closed space to the collecting electrode surface, gas-flow velocity at the upstream area is faster than that at the downstream area. Hence, particle re-entrainment phenomena are convenient to occur in upstream area. As results, it has been shown that collected particle re-entrainment phenomena are pertinent to the gas-flow distribution.
