Computational particle fluid dynamics(CPFD)numerical simulations were used to investigate the effect of particle size distribution changes on critical fluidization velocity by characterizing SiO2 particles from three different distributions i.e.,conventional bed materials in CFB boiler(Set 1),increased content of fine particles within the boiler(Set 2),and reduced particle size of initial bed support materials(Set 3).The results show that at the same bed height,the critical fluidization velocities of the Set 1,Set 2 and Set 3 bed materials are 0.51,0.30 and 0.20 m/s,respectively.The results show that increasing the fine particle content in the furnace and reducing the particle size of the initial bed support material can significantly reduce the critical fluidization velocity.Comparing the numerical simulation results of the critical fluidization velocity for wide particle size distributions with the prediction results of related correlations,the prediction results from the Ergun correlation have a small deviation,while the prediction results of the Wen-Yu correlation are significantly lower.
关键词
循环流化床锅炉/临界流化风速/宽筛分颗粒/计算颗粒流体力学
Key words
CFB boiler/critical fluidization velocity/wide size distribution particle/computational particle fluid dynamics
引用本文复制引用
基金项目
国家重点研发计划项目(2023YFB4005701)
National Key Research and Development Program of China()
维普
万方数据