Experimental investigation on a novel agglomeration device based on charged ultrasonic spray and vortex generators for improving the removal of fine particles

Abstract

Multi-field synergistic agglomeration is a promising pretreatment technology for improving the control and removal of fine particles. In this work, a novel agglomerator coupling with plasma charged ultrasonic spray and turbulent vortex generator was put forward, which has three agglomeration modes, namely turbulent agglomeration, atomized turbulent agglomeration and charged atomized turbulent agglomeration. As a pretreatment device, the agglomerator was combined with a fabric filter for the experimental investigation. The result indicated that the agglomeration efficiencies of the PM1 for the three agglomeration modes were 21.8%, 53.2% and 68.9%, respectively; and the removal efficiencies of the PM1 for the only fabric filter and the fabric filter combined with the three agglomeration modes were 66.5%, 83.9%, 86.8% and 89.7%, respectively. The characteristic experiment of the designed electrode showed that the stable voltage was about 19–38 kV and the charge-to-mass ratio was in the range of 1–5 mC kg−1. The optimization study of the two important parameters showed that the atomization quantity was recommended in the range of 1.6–2.7 kg∙h−1 and the inlet flue gas velocity should be as small as possible and close to 4.8 m/s to ensure the agglomeration effect.