高校化学工程学报2025，Vol.39Issue(5)：845-855,11.DOI:10.3969/j.issn.1003-9015.2025.05.007
Geldart-B类等密度混合颗粒临界流化特性研究
Study on critical fluidization characteristics of Geldart-B mixed particles with isodensity
摘要
Abstract
In order to understand the transitional fluidization of mixed particles in gas-solid fluidized bed,the criti-cal fluidization characteristics of Geldart B-type binary,ternary,and wide-size distribution mixed particles were in-vestigated by cold-mode experiments.We examined the effect of particle composition,particle size ratio,and parti-cle size distribution on the critical characteristic velocities and the bed voidage was examined.A phase diagram of the separation-mixing fluidization equilibrium of mixed particles was established.The results showed that the change in bed voidage caused by particle composition and size ratio is the essential reason for the difference of the critical fluidization characteristics.As the increase of the mass fraction of coarse particles,the bed voidage first de-creases and then increases.As the increase of the particle size ratio,the bed voidage decreases.When the mass fraction of the coarse particles was greater than 0.4,the critical characteristic velocities increase significantly.The addition of the medium particles attenuates the segregation behavior of the mixed particles,and the fluidization process has no obvious stratified phase boundary.The prediction models for the critical characteristic velocities of transitional fluidization were established by considering the effects of the particle composition and the size ratio on the bed voidage,which provided the theoretical foundation for determining the transitional fluidization of mixed par-ticles.关键词
Geldart-B/混合颗粒/过渡流态化/分离与混合/临界特征速度Key words
Geldart-B/mixed particle/transitional fluidization/segregation and mixing/critical character-istic velocity分类
化学工程引用本文复制引用
王宏飞,刘汉涛,巴忠仁,赵建涛,房倚天..Geldart-B类等密度混合颗粒临界流化特性研究[J].高校化学工程学报,2025,39(5):845-855,11.基金项目
山西省基础研究计划青年科学研究项目(202303021222413) （202303021222413）
中国科学院战略性先导科技专项(XDA29050600). （XDA29050600）
