Direct measurement of particle growth and interparticle adhesion force and DEM simulation under the vapor phase polymerization condition

为了开辟气相烯烃聚合过程的微观研究新途径，本文旨在进行DEM模拟、颗粒生长过程的直接可视化观察、基于生长数据的动力学模型的建立以及颗粒-颗粒相互作用的直接测量。建立了粒子混合对聚合反应器非等温温度场影响的数值模拟模型。实验上，在微反应器中可以直观地观察颗粒的生长过程。新建立的动力学模型成功地再现了颗粒的生长数据。与以前的预测值相比，模型拟合观测数据确定的参数在合理范围内。用新研制的粒子相互作用计和红外照相机分别观察了粒子间的相互作用和热传递。设计并制作了加压粒子相互作用仪。所有这些成就都是原创的，其他研究者还没有报道过类似的成果。

To open a new microscopic approach to gas-phase olefin polymerization process, DEM simulation, direct visual observation of particle growth process, development of a kinetic model based on the growth data and direct measurements of particle-particle interaction were aimed at. A DEM model was successfully developed to simulate the effect of particle mixing on non-isothermal temperature field in the polymerization reactor. Experimentally, the particle growth process was made possible to observe visually in a microreactor. The particle growth data were successfully reproduced by the newly developed kinetic model. Parameters determined by the model fitting to the observed data are in reasonable range compared to the previously predicted values. Particle-particle interactions in terms of cohesion as well as heat transfer were observed by a particle interaction meter newly developed and by an IR camera, respectively. A pressurized particle interaction meter was designed and constructed. All of these achievements are original and nothing similar has yet reported by other investigators.