Phase Equilibrium And Computational Fluid Dynamics Research On Residue Hydrogenation System

Oil is one of the most important currently widely used primary energy sources, and the residue is the rest part of the petroleum after the hydrogenation processe, it is about 50% of the oil before processing. Therefore, studying the residual oil hydrotreating processing, improving the conversion rate can be effective to make full use of the limited petroleum resources. As a result, the gas-liquid phase equilibrium of H2 in oil and the computational fluid dynamics of the residual oil hydrogenation system was studied in this work.The solubility and liquid phase mass transfer coefficient of hydrogen (H2) in catalytic diesel at temperatures (80?,100?,130?,150? and 180?) and pressures (1-6 MPa) were measured. The solubility increases with the increasing of pressure and temperature, which is agreement with the commom regularity of the gas solubility in organic solvent. In this work, the henry constant was also been computed, and the lnH shows a good linear relationship with 1/T(lnH(Pa)=2447.02/T(K)-0.11). Moreover, liquid phase mass transfer coefficient of H2 in catalytic diesel were also been studied, and with the increase of pressure, the mass transfer coefficient also increases, indicating that H2 dissolves in diesel oil more rapidly at high pressures. Furthermore, the solubility of H2 in diesel was predicted by the COSMO-RS model using six virtual model compounds. Both the experimental data and predicted values agree well, the average deviation was within 1.65%. On this basis, H2 solubility in several hydrocarbon components with the same carbon atom but different ratios of C/H atoms was further predicted by the COSMO-RS model, and we found that revealing that H2 solubility decreases with the increase of the degree of unsaturation for hydrocarbons. And even, the solubility in aromatics is lower than that in alkanes.In this work, computational fluid dynamics (CFD) commercial software Fluent was introduced to complete the simulation research of a kind of new type fluided bed reactor, which was developed by Fushun Research Instituteof Petroleum and Petrochemicals(FRIPP), with a three-phase separator in it. The three-phase flow in the reactor, the pressure and temperature distribution, the phase holdup of the three phases, and even the outlet rate of the solid phase were all been studied through establishment a three phase flow model. The simulation results showed that the three-phase distribution is relatively uniform in fluided bed, and large gas holdup is helpful to the react between the gas and the liquid. The influence of the operating conditions'(feed flow rate, steam liquid feed rate, catalyst particle diameter) change on the result were also been studied in this paper. If augmenting the gas and liquid feed flow rate by the same proportion, the time needed for get a new balance between oil-gas system decrease. In addition, the simulation results between two type fluided bed reactor (with and without three-phase separator) was compared in this paper. It can be found that introduce of the three-phase separator in the reactor can effectively reduce the outflow loss of the catalyst. In this paper, the simulation of the flow characteristics of gas-liquid-solid three phase provides a theoretical basis for the design and optimation of the three-phase fluided bed reactor.