中南大学学报（自然科学版）2023，Vol.54Issue(11)：4531-4538,8.DOI:10.11817/j.issn.1672-7207.2023.11.030
基于PC-CFB的磨煤机分离器产品细度数值模拟
Numerical simulation of product fineness of a vertical spindle mill based on PC-CFB technology
摘要
Abstract
To improve the product fineness of the vertical spindle mill and meet the requirements of powdered coal-circulating fluidized bed on the size of feed coal,a four-way coupling method using dense discrete phase model with kinetic theory of granular flow was adopted to calculate the gas-solid flow inside a ZGM80 vertical spindle mill separator.Firstly,the velocity vector distributions inside the separator were obtained by calculating the flow field.Secondly,particles were added to study their motion behavior and spatiotemporal distributions inside the separator.Finally,the overflow yield of the separator at different air flow rates was calculated to obtain the ventilation characteristics of the vertical spindle mill after removing the baffle.The results show that when the baffle of the separator is removed,the rotational flow of gas entering the inner cone of the separator is weakened,and the tangential velocity is smaller than 8 m/s.The particle size stratification is evident in the separator,and the rising speed of fine particles is higher than that of coarse particles.When t=0.6 s,particles begin to be discharged from the return outlet.When t=5.0 s,the particle mass flow rate of both product and return outlets reaches a stable state,and the particle size distribution at the product outlet meets the requirements of PC-CFB technology.关键词
粉煤循环流化床/磨煤机分离器/细度/DDPM/通风特性Key words
powdered coal-circulating fluidized bed/vertical spindle mill separator/fineness/DDPM/ventilation characteristics分类
能源科技引用本文复制引用
尚曼霞,姚禹歌,柯希玮,周托,黄中..基于PC-CFB的磨煤机分离器产品细度数值模拟[J].中南大学学报（自然科学版）,2023,54(11):4531-4538,8.基金项目
国家重点研发计划项目(2022YFB4100301)(Project(2022YFB4100301)supported by the National Key Research and Development Program of China) （2022YFB4100301）
