乙烯气相聚合中颗粒稳态热质传递模型研究

为考察乙烯气相聚合过程中颗粒内部单体浓度及温度分布，建立并求解了颗粒的稳态热质传递模型：等温等浓度模型和变温变浓度模型。等温等浓度模型假设颗粒内单体浓度及温度均匀分布，仅考虑颗粒边界层的对流传质及传热；变温变浓度模型认为颗粒内存在单体扩散及热传导，同时颗粒边界层与本体进行对流传质及传热。模拟结果表明，粒径小的聚合物颗粒内单体浓度低而温度高；随粒径长大，颗粒内浓度升高温度降低，趋于颗粒外的气相浓度和温度；聚合物颗粒内的温度梯度较小，主要温度梯度集中于颗粒表面与气相界面之间。

Study on Steady-State Heat and Mass Transfer Models for Particles in Ethylene Gas-Phase Polymerization

Two steady state heat and mass transfer models were developed to examine intra -particle concentration and temperature profile in ethylene gas-phase polymerization.Uniform monomer concentration and temperature inside particle were assumed in uniform concentration and temperature model and boundary layer mass and heat transfer resistances by convection were considered.Intra-particle monomer diffusion and heat conduction were taken into account in distributed concentration and temperature model as well as bou...