Operating conditions strongly affect the yield and quality of polysilicon in a polysilicon fluidized bed.In this study,a new model of polysilicon fluidized bed was established using the Euler-Euler model coupled with ...Operating conditions strongly affect the yield and quality of polysilicon in a polysilicon fluidized bed.In this study,a new model of polysilicon fluidized bed was established using the Euler-Euler model coupled with population balance model(PBM),which was combined with fluid flow,heat,and mass transfer models,while considering the scavenging effect of silicon fines.The effects of different operating conditions on the deposition and formation rates of silicon fines were investigated.Results show that the model can correctly describe the particle growth process in the fluidized bed of polysilicon.The silicon fines and the interphase velocity difference show"N"-and"M"-shaped distributions along the axial direction,respectively.The particle temperature and concentration near the wall are higher than those in the central region.The decomposition of silane in the bottom region of the bed is dominated by het-erogeneous deposition.The scavenging of silicon fines occurs in the dilute-phase region.The effects of operating conditions,i.e.inlet gas temperature,silane composition,and gas velocity,on the reactor performance were also explored comprehensively.Increasing the inlet gas composition and velocity enhances the formation rates of solid silicon and fines.Increasing the inlet gas temperature promotes the growth of solid silicon and inhibits the formation of silicon fines.High fluidization ratio,low inlet silane concentration,and high inlet gas temperature enhance the selectivity of silicon growth.展开更多
The structure of the gas distributor is closely related to the production efficiency of organosilicon monomers.To improve the production efficiency of organosilicon monomers,this study uses Eulerian-Eulerian two fluid...The structure of the gas distributor is closely related to the production efficiency of organosilicon monomers.To improve the production efficiency of organosilicon monomers,this study uses Eulerian-Eulerian two fluid model and proposes a design formula for the gas distributor to optimize the gas distributor.It is proposed that the pressure drop of the gas distributor,the velocity nonuniformity coefficient,the relative standard deviation of the solid holdup,and the solid particle dispersion coefficient are used to evaluate the performance of the gas distributor.The results show that the performance of the gas distributor is significantly improved when the opening ratioΦ=0.53%is optimized toΦ=0.18%,in which the relative standard deviation of the solid holdup is reduced by 22%,and the solid particle dispersion coefficient is reduced by 40%.On this basis,this article studies the influence of different arrangements of vent holes on gas-solid fluidization characteristics.The results show that the circular arrangement of vent holes is helpful to the mixing of gas and solid.展开更多
Phenomics explores the complex interactions among genes,epigenetics,symbiotic microorganisms,diet,and environmental exposure based on the physical,chemical,and biological characteristics of individuals and groups.Incr...Phenomics explores the complex interactions among genes,epigenetics,symbiotic microorganisms,diet,and environmental exposure based on the physical,chemical,and biological characteristics of individuals and groups.Increasingly efficient and comprehensive phenotyping techniques have been integrated into modern phenomics-related research.Multicolor flow cytometry technology provides more measurement parameters than conventional flow cytometry.Based on detailed descriptions of cell phenotypes,rare cell populations and cell subsets can be distinguished,new cell phenotypes can be discovered,and cell apoptosis characteristics can be detected,which will expand the potential of cell phenomics research.Based on the enhancements in multicolor flow cytometry hardware,software,reagents,and method design,the present review summarizes the recent advances and applications of multicolor flow cytometry in cell phenomics,illuminating the potential of applying phenomics in future studies.展开更多
基金support by the Science and Technology Planning Project of the Science and Technology Department of Yunnan Province (grant No.202002AB080002 and 202202AB080014).
文摘Operating conditions strongly affect the yield and quality of polysilicon in a polysilicon fluidized bed.In this study,a new model of polysilicon fluidized bed was established using the Euler-Euler model coupled with population balance model(PBM),which was combined with fluid flow,heat,and mass transfer models,while considering the scavenging effect of silicon fines.The effects of different operating conditions on the deposition and formation rates of silicon fines were investigated.Results show that the model can correctly describe the particle growth process in the fluidized bed of polysilicon.The silicon fines and the interphase velocity difference show"N"-and"M"-shaped distributions along the axial direction,respectively.The particle temperature and concentration near the wall are higher than those in the central region.The decomposition of silane in the bottom region of the bed is dominated by het-erogeneous deposition.The scavenging of silicon fines occurs in the dilute-phase region.The effects of operating conditions,i.e.inlet gas temperature,silane composition,and gas velocity,on the reactor performance were also explored comprehensively.Increasing the inlet gas composition and velocity enhances the formation rates of solid silicon and fines.Increasing the inlet gas temperature promotes the growth of solid silicon and inhibits the formation of silicon fines.High fluidization ratio,low inlet silane concentration,and high inlet gas temperature enhance the selectivity of silicon growth.
基金The authors are grateful to the financial support by the Science and Technology Planning Project of the Science and Technology Department of Yunnan Province(grant No.202002AB080002).
文摘The structure of the gas distributor is closely related to the production efficiency of organosilicon monomers.To improve the production efficiency of organosilicon monomers,this study uses Eulerian-Eulerian two fluid model and proposes a design formula for the gas distributor to optimize the gas distributor.It is proposed that the pressure drop of the gas distributor,the velocity nonuniformity coefficient,the relative standard deviation of the solid holdup,and the solid particle dispersion coefficient are used to evaluate the performance of the gas distributor.The results show that the performance of the gas distributor is significantly improved when the opening ratioΦ=0.53%is optimized toΦ=0.18%,in which the relative standard deviation of the solid holdup is reduced by 22%,and the solid particle dispersion coefficient is reduced by 40%.On this basis,this article studies the influence of different arrangements of vent holes on gas-solid fluidization characteristics.The results show that the circular arrangement of vent holes is helpful to the mixing of gas and solid.
基金This work was supported by National Key Project of China(2016YFA0502201 and 2017YFA0700404)Standard Technology Management Project(2013811)+1 种基金the State Administration for Market Regulation,National Science and Technology Basic Condition Platform project(APT2001)Natural Science Foundation of Shenzhen(JCYJ20190808150009605).
文摘Phenomics explores the complex interactions among genes,epigenetics,symbiotic microorganisms,diet,and environmental exposure based on the physical,chemical,and biological characteristics of individuals and groups.Increasingly efficient and comprehensive phenotyping techniques have been integrated into modern phenomics-related research.Multicolor flow cytometry technology provides more measurement parameters than conventional flow cytometry.Based on detailed descriptions of cell phenotypes,rare cell populations and cell subsets can be distinguished,new cell phenotypes can be discovered,and cell apoptosis characteristics can be detected,which will expand the potential of cell phenomics research.Based on the enhancements in multicolor flow cytometry hardware,software,reagents,and method design,the present review summarizes the recent advances and applications of multicolor flow cytometry in cell phenomics,illuminating the potential of applying phenomics in future studies.
