Numerical simulation of two-component particle flow and combustion in circulating fluidized bed furnace based on EMMS drag model
In order to solve the limitations of traditional single-particle size fluidization models in reflecting the actual operational conditions of circulating fluidized bed(CFB)boilers,a mathematical model tailored to the wide particle size distribution characteristics of bed materials was proposed.It aimed at enhancing the accuracy of CFB boiler design and operational optimization.A 50 kW CFB experimental experimental device was selected as the research subject,for which an Euler-Euler two-component particle phase flow and combustion computational fluid dynamics model based on the energy minimization multi-scale(EMMS)drag model was developed,and a three-dimensional numerical simulation of the flow and combustion processes within the CFB boiler was conducted.The numerical simulation results demonstrated that the two-component particle model predicted temperature distribution and composition distribution with an error of less than 10%compared to experimental data.A higher degree of accuracy than the traditional single-component particle model was showed.Under the two-component particle condition,the flow exhibited a typical"core-annulus"pattern,with coarse particles prominently settling at the bottom of the riser,peaking at about 0.2 m from the primary air inlet.In the dense phase region,the temperatures predicted by the two-component particle model were slightly higher than those of the single-component particle model.Additionally,the concentrations of SO2 and NO were significantly influenced by the secondary air.This model more accurately reflects the combustion and flow processes inside the CFB boiler,providing a vital reference for the optimization of CFB boiler operations and engineering applications.
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