Among the separation techniques used in industry,the triboelectric separation of insulating particles using rotary tube is an efficient technology employed in waste recovery and mineral industries.This process,also ca...Among the separation techniques used in industry,the triboelectric separation of insulating particles using rotary tube is an efficient technology employed in waste recovery and mineral industries.This process,also called free-fall triboelectric separation,is widely used for the sorting and the purification of granular materials resulting from industrial plastic wastes.This paper aims at the achievement of a comprehensive description of a laboratory triboelectric separator built up by the authors and its utilization for an experimental study carried out on granular samples containing particles of polyvinyl chloride(PVC)and polyethylene(PE).Thus,among the variable factors of the process,we analyzed the influence of the most important ones,i.e.,the rotational speed of the cylinder n(rpm),the applied high voltage U(kV),the charging time of the particles t(s),the mass of the sample m(g),and the composition percentage of the sample Cp(%).展开更多
Identification of the optimal operating conditions and evaluation of their robustness are critical issues for industrial processes.A standard procedure,for modelling a laboratory-scale wire-to-cylinder electrostatic p...Identification of the optimal operating conditions and evaluation of their robustness are critical issues for industrial processes.A standard procedure,for modelling a laboratory-scale wire-to-cylinder electrostatic precipitator and for guiding the research of the set point,is presented.The procedure consists of formulating a set of recommendations regarding the choice of parameter values for electrostatic precipitation.The experiments were carried out on a laboratory cylindrical precipitator,built by one of the authors,with samples of wood particles.The parameters considered are the applied high voltage U,the air flow F,and the quantity of dust in air m.Several"one-factor-at-a-time"followed by factorial composite design experiments were performed,based on the following three-step strategy:1)Identify the domain of variation of the variables;2)Determine the mathematical model of the process outcome;3)Validation of the math-ematical model and optimisation of the process.展开更多
When it rains,electric power transmission lines start vibrating due to corona effect.This type of vibration is known as“corona-induced vibration”.The aim of this paper is to elaborate a mathematical model for numeri...When it rains,electric power transmission lines start vibrating due to corona effect.This type of vibration is known as“corona-induced vibration”.The aim of this paper is to elaborate a mathematical model for numerical simulation of the corona-induced vibration,with consideration of the influence of the magnitude and the polarity of the electric field on the conductor surface.Finite element method was employed to develop the numerical model,and the finite difference method was used for the time discretisation.The moment of application of the coronainduced force is evaluated using the resultant vertical force applied to a water drop,suspended under a high voltage conductor.Some experimental results of other authors are exploited to evaluate the precision of the simulation and the validation of numerical results.展开更多
文摘Among the separation techniques used in industry,the triboelectric separation of insulating particles using rotary tube is an efficient technology employed in waste recovery and mineral industries.This process,also called free-fall triboelectric separation,is widely used for the sorting and the purification of granular materials resulting from industrial plastic wastes.This paper aims at the achievement of a comprehensive description of a laboratory triboelectric separator built up by the authors and its utilization for an experimental study carried out on granular samples containing particles of polyvinyl chloride(PVC)and polyethylene(PE).Thus,among the variable factors of the process,we analyzed the influence of the most important ones,i.e.,the rotational speed of the cylinder n(rpm),the applied high voltage U(kV),the charging time of the particles t(s),the mass of the sample m(g),and the composition percentage of the sample Cp(%).
基金supported by the Framework of a TASSILI Project,jointly financed by the French and Algerian Governments.
文摘Identification of the optimal operating conditions and evaluation of their robustness are critical issues for industrial processes.A standard procedure,for modelling a laboratory-scale wire-to-cylinder electrostatic precipitator and for guiding the research of the set point,is presented.The procedure consists of formulating a set of recommendations regarding the choice of parameter values for electrostatic precipitation.The experiments were carried out on a laboratory cylindrical precipitator,built by one of the authors,with samples of wood particles.The parameters considered are the applied high voltage U,the air flow F,and the quantity of dust in air m.Several"one-factor-at-a-time"followed by factorial composite design experiments were performed,based on the following three-step strategy:1)Identify the domain of variation of the variables;2)Determine the mathematical model of the process outcome;3)Validation of the math-ematical model and optimisation of the process.
文摘When it rains,electric power transmission lines start vibrating due to corona effect.This type of vibration is known as“corona-induced vibration”.The aim of this paper is to elaborate a mathematical model for numerical simulation of the corona-induced vibration,with consideration of the influence of the magnitude and the polarity of the electric field on the conductor surface.Finite element method was employed to develop the numerical model,and the finite difference method was used for the time discretisation.The moment of application of the coronainduced force is evaluated using the resultant vertical force applied to a water drop,suspended under a high voltage conductor.Some experimental results of other authors are exploited to evaluate the precision of the simulation and the validation of numerical results.
