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建立了工业尺度数值试验的过热蒸汽/热载体/生物质三相欧拉数理模型。水蒸气设为主连续相,采用k-ε方程描述;热载体和生物质设为两种不同的拟流体相,其黏度和压力采用颗粒动理论方程进行封闭;气固相互作用力采用Symbol-O’Brein曳力模型描述,固固之间作用力采用morsi-alexander模型描述;气固之间传热采用Gunn模型描述。基于该模型的数值试验,实现了喷动流化床混合器的优化设计使热载体与生物质的混合程度达70%以上;并研究了物料性质对生物质终温的影响,生物质终温受生物质粒径的影响最为显著。
A three-phase Euler mathematical model of superheated steam / heat carrier / biomass has been established for industrial scale numerical experiments. Water vapor as the main continuous phase, described by the k-ε equation; heat carrier and biomass set to two different pseudo-fluid phase, the viscosity and pressure using particle dynamics equation closed; gas-solid interaction force by Symbol- The O’Brein drag force model describes the force between the solid and the solid as described by the morsi-alexander model; the heat transfer between gas and solid is described by the Gunn model. Based on the numerical experiment of this model, the optimal design of the spout-fluidized bed mixer was achieved so that the degree of mixing of heat carrier with biomass was over 70%. The effect of material properties on the final temperature of biomass was studied. The effect of material particle size is the most significant.