Computational Fluid Dynamics Simulation Of Liquid-Phase FCC Diesel Hydrotreating In Tubular Reactor

In this paper, the liquid-phase FCC diesel hydrotreating tubular reactor has been studied. The core of this new technology is setting a nanoscale ceramic tube at the inlet of fixed bed reactor. By this way, the mixture effect of oil and hydrogen and the rate of mass transfer have been improved. The experiment has been done by using this reactor. Effects of temperature, space velocity, the amount of mixed hydrogen and pressure on the reaction results have been investigated. On the basis of experimental results, the kinetics model of desulfurization, denitrification, bicyclic aromatic and monocyclic aromatic have been built.The liquid-phase FCC diesel hydrotreating tubular reactor has been simplified. The CFD model of this reactor has been built by using the physical laws of fluid flow, the kinetics model of desulfurization, denitrification, bicyclic aromatic, monocyclic aromatic and the porous medium model and turbulence model. The distribution of temperature and content of sulfide, nitride, bicyclic aromatic and monocyclic aromatic in different parts of the reaction bed have been got. In addition, the concentration distribution of the reactants in different operating conditions has been got. The results were in good accordance with experimental data. Furthermore, the temperature distribution in reaction bed and the point of the highest temperature in different operating conditions have been got. It provides a reference for the point of adding hydrogen. The three-phase multiphase model has been built in order to simulate the three phase of FCC diesel hydrotreating tubular reactor, showing the distribution of temperature and content of sulfide in different parts of the reaction bed. The results were in good accordance with two-phase model. The effect of different size of bubbles on hydrodesulfurization has been preliminarily investigated.