Simulation of fine polydisperse particle condensational growth under an octadecane-nitrogen atmosphere  

作　　者：Hua Zhang Ze Wang Wenli Song Songgeng Li 

机构地区：[1]Center for Mesoscience. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China [2]Sino-Danish College. University of Chinese Academy of Sciences. Beijing 100190, China

出　　处：《Particuology》2018年第3期71-79,共9页颗粒学报（英文版）

基　　金：This work was supported by the National Basic Research Pro- gram of China （973 Program, 2014CB744300）, by the National Natural Science Foundation of China （51476180）, and by Meso- science Innovation Fund （COM2015A004）. Discussion with Dr. Susanne Hering on his experiment and effects of initial size is acknowledged.

摘　　要：The evolution of particle size distribution （PSD） of fine polydisperse particles at high number concen- trations （7105 cm-3） was simulated through a combined model employing direct quadrature method of moments （DQMOM） with heat and mass transfer equations. The PSD was assumed to retain log-normal distribution during the heterogeneous condensation process. The model was first verified by exact solu- tion and experimental data prior to investigating the influence of initial conditions on final PSD under an octadecane-nitrogen atmosphere. Low particle number concentrations and high vapor concentrations were beneficial to shift the PSD to larger particles having a narrower distribution. Additionally, vapor depletion has more influence on the final PSD than the heat release parameter for a number concentra- tion of 10^6 cm^-3. This study may assist the design process of a gas-solid separating cyclone, to eliminate dust from high-temperature volatiles by pyrolysis of solid fuels.The evolution of particle size distribution （PSD） of fine polydisperse particles at high number concen- trations （7105 cm-3） was simulated through a combined model employing direct quadrature method of moments （DQMOM） with heat and mass transfer equations. The PSD was assumed to retain log-normal distribution during the heterogeneous condensation process. The model was first verified by exact solu- tion and experimental data prior to investigating the influence of initial conditions on final PSD under an octadecane-nitrogen atmosphere. Low particle number concentrations and high vapor concentrations were beneficial to shift the PSD to larger particles having a narrower distribution. Additionally, vapor depletion has more influence on the final PSD than the heat release parameter for a number concentra- tion of 10^6 cm^-3. This study may assist the design process of a gas-solid separating cyclone, to eliminate dust from high-temperature volatiles by pyrolysis of solid fuels.

关 键 词：SIMULATION Condensational growth Polydisperse particles Particle size distribution 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TS102.523[自动化与计算机技术—控制科学与工程]