Abstract:

Accumulation of electrostatic charges in gas-solids fluidized beds can lead to particle adhesions, electrostatic discharges, wall sheeting and even explosion, so it is of vital importance to reduce the electrostatic level in industrial fluidized beds.A δU-χ_i theory was proposed for the LLDPE-N₂ system.The electronegativity χ_i of the metal ion was assumed to play an important role in determining the polarity of the LLDPE particles, and the change of the electrostatic potential was in negative correlation to the electronegativity of the metal ion after contact and separation of the particles and LLDPE.The charge inducing agent included the positive charge inducing agent, negative charge inducing agent and the inactive liquid charge inducing agent.The experiments in gas-solids fluidized bed with the introduction of three kinds of charge inducing agent were designed and carried out.It was found that the addition of negative charge inducing agent increased the electrostatic level obviously, the addition of a small amount of positive charge inducing agent decreased visibly the electrostatic level, and the addition of inactive liquid charge inducing agent reduced the electrostatic level significantly in the fluidized bed.The results agreed well with the prediction according to the theory proposed, which would be helpful to choosing charge inducing agent in industrial application.