مجله فرآیند نو
پیاپی 67 (پاییز 1398)

In this study, effect of a parameter has been investigated with FLUENT simulator software on increasing sulfur recovery and reaction furnace temperature of Abadan Oil refinery. Results like reaction furnace temperature and mole fraction of products have been validated with experimental data. Effect of O2 enrichment on reaction furnace temperature and amount of sulfur recovery has been studied with mentioned software. In the condition that O2 concentration increases, combustion temperature increases uniformly and results show that sulfur recovery reached to its maximum in high concentration of O2. Modeling turbulent flow, k-e model and for modeling combustion, eddy dissipation model have been used.

Water-gas shift reaction is performed as the key step in the hydrogen industrial plant. In this work, Fe/Cr/Cu high temperature water gas shift catalysts were synthesized by co-precipitation method, using sulfate precursors, in order to improve the catalytic performance and particular emphasis is placed on the mechanical strength and catalytic activity affected by aging time. The prepared and industrial catalysts were compared when they were situated in the operating conditions (at 360oC and 2 bar) and were characterized by BET, XRD, TPR and crushing strength analysis. Increasing the aging time leads to decrease the sintering and specific surface area and increase the mechanical strength of the catalysts. The catalysts prepared with 180 and 270 minutes aging time were shown, 50.5% and 46.5% conversion and 4.46 kg/pellet and 4.53 kg/pellet mechanical strength respectively, that have appropriate performance in comparison with other prepared samples and commercial catalyst.

Adsorptive desulfurization using mesoporous carbons are of the preeminent methods to meet serious international standards in case of sulfur. In this research, the absorbent CMK-3 containing nickel nanoparticles was synthesized and characterization using XRD, BET, SEM and FT-IR. The results showed that the nanostructure was formed and the despite high nickel loading, structural order is still preserved and specific surface of the synthesized samples is maintained at an acceptable level. Then, in the next step, the capability of synthesized adsorbent was carried out in various conditions, which shows the significant yield of them in both low and high temperature. In addition, the absorption yield of these nano-adsorbents was preserved after several reduction, indicating the high potential of these adsorbents in desulphurization.

The decrease in recovery cost and the increase in oil price in the last decade resulted in tremendous increase in oil sands-derived bitumen production in Canada. Oil sands-derived bitumen has the same properties as heavy crude or vacuum residue. In the last decade, different technology development companies were engaged in developing partial upgrading technologies. In these technologies, bitumen properties are improved to meet the pipeline specifications. Some of these technologies are in pilot plant stage and some are in demo plant development stage. In this paper, oil sand reserves in Canada and its production are reviewed. Then premium partial upgrading technologies are presented and discussed. Technology development history, concept, and economics are the main focus in this study. As high fuel oil production is one of the main challenges of Iranian refineries, this paper could be a useful preliminary as a roadmap for researchers and the industry.

Improvement of fuel quality to decrease the impact of environmental and health effects are an important issue all around the world. Increase the octane number of light naphtha is one of the most important processes in modern refineries due to benzene limitation, aromatics, and olefins. Nowadays in refineries, the octane number of hydrocarbon blend is enhanced with components such as 2, 2-DMB, and isopentane. So the purpose of light naphtha isomerization process is the production of these isomers and increase it to hydrocarbon blend with low benzene and finally octane enhancement. In this review, different kinds of naphtha isomerization catalyst are investigated which is included chlorinated alumina, zeolite and sulfated zirconia.

Among the various maintenance methods the condition monitoring method is a proactive method, because before the failure occurs, the time, place and type of failure can be identified. One of the most important methods of condition monitoring is vibration analysis. In the study, the vibration behavior of rotary machines has been studied and an experimental approach has been used to conclude and achieve the research objectives. In this research, it has been tried to take data from the diesel pump under study that the diesel engine has a power of 200 kW and a working pressure of 14 bar; The working health status of this group of machines should be evaluated This is done with the help of vibration measuring tools. By observing the alarm and critical state according to the standards including API610, the exact type of fault has been determined by means of frequency spectrum analysis.