Study on critical fluidization velocity of wide size distribution particles in CFB boilers
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.
CFB boilercritical fluidization velocitywide size distribution particlecomputational particle fluid dynamics
于艺、马有福、吕俊复
展开 >
上海理工大学上海市动力工程多相流动与传热重点实验室,上海,200093
怀柔实验室山西研究院,山西太原,030032
清华大学教育部热科学与动力工程重点实验室,北京,100084
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
国家重点研发计划项目National Key Research and Development Program of China
万方数据
维普
