The fluid–particle interaction and the impact of shrinkage on pyrolysis of biomass inside a 150 g/h fluidised bed reactor is modelled. Two 500 View the MathML sourcem in diameter biomass particles are injected into the fluidised bed with different shrinkage conditions. The two different conditions consist of (1) shrinkage equal to the volume left by the solid devolatilization, and (2) shrinkage parameters equal to approximately half of particle volume. The effect of shrinkage is analysed in terms of heat and momentum transfer as well as product yields, pyrolysis time and particle size considering spherical geometries. The Eulerian approach is used to model the bubbling behaviour of the sand, which is treated as a continuum. Heat transfer from the bubbling bed to the discrete biomass particle, as well as biomass reaction kinetics are modelled according to the literature. The particle motion inside the reactor is computed using drag laws, dependent on the local volume fraction of each phase. FLUENT 6.2 has been used as the modelling framework of the simulations with the whole pyrolysis model incorporated in the form of user defined function (UDF).
展开▼
机译：模拟了在150 g / h流化床反应器内的流体-颗粒相互作用和收缩对生物质热解的影响。将两个直径为500的生物质颗粒以不同的收缩条件注入流化床中。两种不同的条件包括：（1）收缩率等于固体脱挥发分所剩下的体积，以及（2）收缩率参数约等于颗粒体积的一半。根据热和动量传递以及考虑球形几何形状的产品收率，热解时间和粒径，分析了收缩的影响。欧拉方法用于模拟被视为连续体的沙的起泡行为。根据文献对从鼓泡床到离散的生物质颗粒的热传递以及生物质反应动力学进行了建模。使用阻力定律可以计算反应堆内部的粒子运动，具体取决于每个相的局部体积分数。 FLUENT 6.2已用作模拟的建模框架，整个热解模型以用户定义函数（UDF）的形式包含在内。
展开▼
