Effect of turbulent flow field properties on improving the removal of coal-fired fine particles in chemical-turbulent agglomeration

Chemical-turbulent agglomeration is a promising coupling agglomeration method to improve the removal of fine particles, in which the turbulent flow field plays an important role on the collision of chemical droplets and fine particles. However, there is no specific study about the effect of turbulent flow field properties on the agglomeration and removal of fine particles. In this work, three kinds of turbulent vortex sheets with different structures were designed to generate vortexes with different scales and generation dimensions, the particle agglomeration effect and characteristics, as well as the particle removal effect by ESP with different turbulence generators were investigated. The results demonstrated that the turbulence generator with large-scale and two-dimensional vortexes in flow field had the best effect on improving the agglomeration and removal of fine particle. Besides, the motion trajectories and the turbulent agglomeration kernel of chemical droplets and fine particles were calculated to further explore the interaction mechanism of particle agglomeration and flow field properties. The results proved that the turbulent flow field containing large-scale and two-dimensional vortexes can effectively enlarge the capture area of fine particles by chemical droplets and promote the collision probability of them, thus improving the agglomeration and removal of fine particles. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.