In this study, the injection of catalyst particles into a dense gas-solid fluidized bed reactor is investigated using the Euler/Euler approach. Numerical simulations of horizontal catalyst+gas mixture injection through a circular-sectioned nozzle have been performed in order to study the effect of the operating conditions of the injector on the flow hydrodynamics. The study is in the context of a larger project to optimize the nozzle geometry and to determine the operating conditions of the reactor. The nozzle is composed of two annular sections, one outer and one inner. Catalyst is injected from the central section of the nozzle with the carrier phase of nitrogen and the outer section is used to inject only ethylene. This constitutes the primary problem in the configuration, e.g., the probability of having the catalyst in the presence of ethylene in the immediate vicinity of the nozzle. Indeed, catalyst can react with the ethylene and form the thermoplastic polyethylene, which can block the injector depending on the flow conditions and cause the shutdown of the reactor. The results show that the probability of the catalyst going into reaction with the ethylene depends highly on the ratio of the velocities in the outer and the inner sections of the nozzle.
|Publication status||Published - 2013|
|Event||8th International Conference on Multiphase Flow - International Convention Center Jeju, Jeju, Korea, Republic of|
Duration: 26 May 2013 → 31 May 2013
|Conference||8th International Conference on Multiphase Flow|
|Abbreviated title||ICMF 2013|
|Country||Korea, Republic of|
|Period||26/05/13 → 31/05/13|