Influence research of electrostatic environment on dispersion and explosion characteristics of typical biomass organic dust clouds

In order to explore the explosion characteristics of dust cloud under the coupling condition of electrostatic field, flow field and particle motion field, based on the theoretical analysis of the charging mechanism of dust particles in the electrostatic field, the motion mechanism and explosion behavior of three typical biomass dust were studied by means of experiment and simulation. The research results were presented in the electrostatic field to evaluate the dispersion effect and explosion hazard of dust clouds. It was found that when the dust concentration is less than 500 g/m3, both the peak explosion overpressure and the rate of explosion overpressure rise of dust increase with the increase of dust concentration under the loading of electrostatic field. Compared with the case without electrostatic field, the maximum explosion overpressure of three typical organic dusts are increased by 2.6%, 5% and 12.1% respectively. Moreover, a multifield coupling mathematical model of particle charge and motion was established, which not only studied the influence law of electrostatic field on particle charging and gas-dust flow characteristics, but also discussed the influence mechanism of electrostatic field on dust cloud explosion intensity from the perspectives of particle concentration distribution, particle velocity distribution and turbulence intensity parameters. (C) 2022 Elsevier B.V. All rights reserved.