توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱MODELING AND SIMULATION OF CARBON DIOXIDE REPLACEMENT IN METHANE HYDRATE IN PURPOSE OF METHANE RECOVERY
نویسنده(ها): ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی نفت، گاز و پتروشیمی، سال
تعداد صفحات: ۱۲
Large amount of natural gas exists in the form of gas hydrate in subsea sediment and permafrost regions. There are some traditional methods for the dissociation of hydrate and recovery of methane, include depressurization, thermal stimulation and chemicals injection. An alternative approach proposed in the past decade is replacement of carbon dioxide in methane hydrate. It has advantages of recovering methane gas as an important energy resource and mitigating greenhouse gas of carbon dioxide in the atmosphere. In this article, kinetic model is proposed for replacement process and effects of operating parameters suchas system total pressure, diffusion coefficient of CH4 in the hydrate layer and initial mole fraction of CO2in gas phase on the replacement efficiency are simulated. It concluded that replacement rate and the mole fraction of CH4 in gas phase increases with increasing initial CO2 mole fraction and diffusion coefficient while decreasing with system total pressure. We have also proposed a Distributed model for predicting thediffusion of gases CO2 in the CH4 hydrate layer and solved with COMSOL Multiphysics software. Theresults showed that gases CO2 can diffuses into CH4 hydrate layer only about 53% of reactor volume and about 87% of reactor volume is affected by temperature variation along the reactor due to replacement process.<\div>

۲Enhancement of Methanol Production by Sorption–Enhanced Process in a Novel fluidized bed Configuration
اطلاعات انتشار: اولین کنفرانس دوسالانه نفت، گاز و پتروشیمی خلیج فارس، سال
تعداد صفحات: ۶
In the present study, a mathematical model of the fluidized bed reactor for methanol synthesis with in–situ water adsorption is investigated, theoretically. The two–phase theory of bubbling regime is applied to model the fluidization concept. The density difference between binary adsorbent and catalyst particles separate them. The heavy catalyst particles tend to sink and the light adsorbent particles tend to rise. During the methanol synthesis process, the motivation for in situ water removal by using adsorbent particles (Zeolite 4A) is to displace the water–gas shift equilibrium to boost methanol productivity. The simulation results reveal that selective water adsorption from methanol synthesis in Sorption Enhanced Fluidized bed Reactor (SE–FMR) leads to a huge enhancement of methanol production compared to the other configurations.<\div>

۳Proposing Various Structrual Alternatives for Acid Gas Enrichment of Khangiran Natural Gas Refinery
اطلاعات انتشار: اولین کنفرانس دوسالانه نفت، گاز و پتروشیمی خلیج فارس، سال
تعداد صفحات: ۱۱
Low quality SRU feed stream causes serious operational problems rise like combustion chamber low flame temperature, unburned BTEX components, low quality and impure produced elemental sulfur with dark yellowish color. Low acid gas quality combined with the premature catalyst deactivation will eventually decrease the overall efficiency of the entire Claus process of Khangiran refinery from the standard value of 97% to less than 90%. Using sterically–hindered solvents, promoted tertiary amines or various configuration for gas treating unit is several alternatives for acid gas enrichment (AGE) to reduce the concentration of carbon dioxide and heavy aromatic hydrocarbons while enriching the H2S content of SRU feed stream. The present article compares two distinct enrichment schemes for Khangiran refinery acid gas stream by employing different configuration of gas treatment unit. The results are then compared with each other’s to select the optimal AGE scheme, which can maximize the H2S content of SRU feed stream while minimizes H2S emission to atmosphere. The simulation results revealed that by employing optimal values for the acid gas split ratio, the recycled amine split ratio and the enrichment tower pressure about 0.8, 0.14 and 60, respectively in the second scheme, the SRU feed stream can significantly enriched from its original value of 33.5 mol% H2S to about 70 mol%.<\div>
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