Mathematical Modeling and Simulation of the Commercial Diesel Hydrotreating Reactor

摘要

A three-phase nonisothermal heterogeneous model for describing the hydrotreatingrnreactions in a trickle-bed reactor with complete catalyst wetting was solved. It includesrncorrelations for determining solubility data, mass-transfer coefficients, and properties ofrnthe compounds under operating conditions. The model, based on the two-film theoryrnand mass-transfer resistance at the gas-liquid and liquid-solid interfaces. The differentrnsulphur compounds were taken as a lump component in the diesel fuel. The sulphurrnconcentration in liquid phase as well as hydrogen and hydrogen sulfide profiles werernsimulated along the bed. The sulphur content of the product was found to be stronglyrndependent on the gas/oil flow ratio in the reactor. This is due to the inhibiting effect ofrnhydrogen sulfide which proved strong suppression of conversion rate of sulphurrncompounds. Therefore in present work, for hydrodesulphurization (HDS) reaction threernkinetic models were considered and were tested for better product properties estimation.rnThe model was validated with plant operating data and could predict the productrnsulphur content and reactor bed temperature profiles in commercial plant adequately.