فهرست مطالب

نشریه مهندسی گاز ایران
پیاپی 1 (خرداد 1393)

تاریخ انتشار: 1393/03/26
تعداد عناوین: 10

فارسی
English

انتخاب همه

Mechanisms of Gas Separation by Membrane

H. Ahadi, M. Mirzaei*, M. Shariaty, Niassar Page 10

During the last decades, membrane processes have been widely considered all over the world for their high potential and excellent performance in various applications such as gas separation. A large number of researchers have focused their efforts on developing and modifying a new generation of membranes to reach the industrial stage. For this purpose, it is essential to identify the various mechanisms in gas separation by membranes. In general, two mechanisms can be assumed for gas separation including solution- diffusion and pore flow mechanisms. The first mechanism is used for non-porous membranes and the other one, which can be divided into several mechanisms, is related to porous membranes. In this study these mechanisms will be introduced, described and discussed.
Keywords: Membrane gas separation, Solution, diffusion mechanism, Pore flow mechanism

Abstract View Paper Research/Original Article Original: Persian
Sulfide Stress Corrosion with Crack (SSC) in Heat Affected Zone in Sour Gas pipelines

Jalil Jamali, Hosein Esmaeili Mazidi*, Mohammad Amel Kashi Page 17

The aim of this survey is to check the probable formal cracks with the help of diverse Electrodes and also considering operational variables, by making the test parts in order to relevant standards and from the Pipes type which I used in Sour Gas pipeline which are Carbon Steel, type API5L and Austenite stainless Steel, type 316L so we are searching the resistance rate against Stress Corrosion and probable formed Cracks in heat affected zone (HAZ) and then finding a proper solution due to decreasing this phenomenon. Microscopic researches on samples in Heat Affected Zone show that the most of samples in this zone have potential to form Cracks of Stress Corrosion are combination of two kind of Cracks, Inter granular Cracks and Tran granular Cracks, but samples with variable of Inter granularCracks are more and more effective. The results show that the least Cracks are due to use of some Electrodes with base metal in accordance with Chemical combinations and also Electrodes with higher Ni ratio with base metal also combined Cracks due to test time ,120 days and more Sulfide in tension samples have increased.
Keywords: Stress Corrosion with Crack (SSC), HAZ, Sour Gas, pipe line, Welding Electrode

Abstract View Paper Research/Original Article Original: Persian
Investigating the Impact of Molecular Diffusion in Natural Gas Storage Process in an Iranian Depleted Fractured Oil Reservoir

Yousef Kazemzadeh, Masoud Riazi* Page 27

Iranian oil reservoirs are mainly fractured. Performance of such reservoirs could be significantly different form the conventional reservoirs. That is mainly due to some additional flow displacement mechanisms, which take place in fractured reservoir. One of these mechanisms is molecular diffusion, which could play a key role on oil production. The impact of molecular diffusion on flow displacement during gas injection for either displacement or storage purposes would be more pronounced in a fractured reservoir compared to that in a conventional reservoir. It is mainly because of different oil trapping types and huge difference between contact area of the in situ oil and the injected gas phase in these two kinds of reservoir. In this study, the process of natural gas storage in an Iranian heavy oil fractured reservoir isinvestigated. In this paper, specifically the impact of molecular diffusion on the primary oilproduction and different stages of gas storage process are studied using a commercial simulator. The results of this study show that molecular diffusion could play an important role on injection/ production rates as well as the average reservoir pressure during injection process. This impact would be more pronounced when a gas with different composition compared to that in the reservoir is used for storage purposes.
Keywords: molecular diffusion, fractured reservoir, natural gas storage, simulation, depleted oil reservoir

Abstract View Paper Research/Original Article Original: Persian
Static and Dynamic Simulation of 1, 3 Butadien Distillation Unit

Rahbar Rahimi*, Shirin Bulaghi Page 36

Dynamic behaviour of chemical, petrochemical and refineries process parameters are very complex. Considerations of system dynamic behaviour with respect to the system disturbances are necessary for proper design of such processes. The study leads to the selection or justification of installing process control system. In the present research a dynamic and static simulation of 1, 3 butadien separation distillation trains were scrutnized with the aim of retrofiting the existing unit with the divided wall columns. Attention on the selection of thermodynamic model revealed that the use of Peng- Robinson thermodynamic model is appropriate. The dynamic behaviour showed insensesivity of purified butadien stream to the feed flow rate.
Keywords: Distillation, static simulation, dynamic simulation, DWC, 1, 3 butadien, thermodynamic model

Abstract View Paper Research/Original Article Original: Persian
Gas Desulfurization Process Using ZnO Nanoparticles

M. Shariaty Niassar*, M. Ezati, Sh. Morsaly Page 46

Removal of acid gas components for corrosion control, prevent catalysts poisoning in downstream processes and environmental standards in oil, gas and petrochemical much is important. The operation of H2S absorption towers, common industrial catalysts, gas sensors and absorbed sulfide is used in drilling enviroments. The removal of hydrogen sulfide, zinc oxide, due to tis high equilibrium constant of the process, such as the desulfurization of synthesis gas is heavily used. In these processes, hydrogen sulfide is converted to sulfur coal output current due to the high temperature of the cdsorbent bed of zinc oxide used.
Keywords: Desulfurization, Gas stream, Zinc Oxide Nanoparticles

Abstract View Paper Research/Original Article Original: Persian
Study of Physical Solvents Suitable for Acid Gas Removal Processes from Gas Streams

Sayyed Ali Taheri*, Afarin Zarei, Kazem Kashefi, Nadia Hasanzadeh Page 53

Nowadays acid gas removal from gas streams using physical solvents is very common. Till now eight processes that use seven different physical solvents has been developed. In this study economic-technical investigation of physical solvent processes, advantages, disadvantages and application of every process for capture of acid gas from a gas stream has examined. Also commercialized processes all over the world have investigated. It was found that physical solvents are appropriate for high pressure and concentrated acid gas streams and they use less energy and have higher degradation time compared to chemical solvents.
Keywords: Greenhouse Gas, Acid Gas, Air Pollution, Capture, Physical Solvent

Abstract View Paper Research/Original Article Original: Persian
The Modeling of the Oxidative Coupling of Methane

M.Zarkesh*, H.Brijanian, N.R.Rasouli, F.Joda Page 60

In the conventional view, since we are not able to express the system degrees of freedom variations at different locations, there exists no option, other than doing experiments, to access the relations among the system ruling parameters. Experimental correlations so obtained are valid, only within the boundries of measured parameters, hence cannot over all requirements. Using the computational fluid dynamics (CFD), the degrees of freedom variations at all locations and all times are accessible. This ability results from the simultaneous solution of the continuity equations, applied on small region of the system. In this investigation, the oxidative coupling of Methane modeling ,which is one of the direct methane conversion processes, is studied. The desirable product of this process is Ethylene. By simultaneous solution of reaction equations, using the FLUENT software, the temperature effects on the Methane percent conversion, the Oxygen percent conversion and the reaction selectivity were investigated. The aforementioned solution was fulfilled at 1073 and 1123 degrees of Kelvin, which have maximum reaction efficiencies.
Keywords: Oxidating coupling of Methane, Modeling, Ethylene, conversion percent

Abstract View Paper Research/Original Article Original: Persian

علمی مصوب

نشریه مهندسی گاز ایران

Iranian Gas Engineering Journal

دوفصلنامه فنی مهندسی

آخرین شماره | آرشیو

ISSN: 2588-5251 eISSN: 2588-5251

صاحب امتیاز:

انجمن مهندسی گاز ایران

مدیر مسئول:

دکتر محمدرضا امیدخواه نسرین

سردبیر:

دکتر رضا مسیبی بهبهانی

تلفن نشریه: ۰۲۱-۸۸۵۵۲۰۴۸

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فهرست مطالب

نشریه مهندسی گاز ایران پیاپی 1 (خرداد 1393)

نشریه مهندسی گاز ایران

Iranian Gas Engineering Journal

نشریه مهندسی گاز ایران
پیاپی 1 (خرداد 1393)