University of IsfahanGas Processing Journal2322-32511120130101Formation Kinetics of Structure H Gas Hydrate182016010.22108/gpj.2013.20160ENMohsenVafaii SeftiEngineering Faculty, Tarbiat Modares University, IranBehnazParviziSchool of Chemical, Gas and Petroleum Engineering, Semnan University, IranFarshadVaraminianSchool of Chemical, Gas and Petroleum Engineering, Semnan University, IranJournal Article20160615This paper investigates the kinetics of structure H (sH) formation kinetics above and below the structure I (sI) formation equilibrium curve at temperatures of between 2Â°C and 6Â°C. Methane was used as a help gas and methylcyclohexane (MCH) was used as sH former. It was concluded that in the points above the sI formation equilibrium curve, at the first, the sI forms, and then converts to sH because of the low solubility of MCH in water. In the points under the sI equilibrium curve, at the first sH forms after a long induction time. The study also show the effect of the addition of hydroxymethylcellulose (in three concentrations of 0.05, 0.1 and 0.15 Wt%) on sH hydrate formation kinetics. With this additive, it was observed that the rate of sH formation increases.http://gpj.ui.ac.ir/article_20160_a19a3727658465066539b0ccf77cf6a4.pdfUniversity of IsfahanGas Processing Journal2322-32511120130101Selection of the Best Efficient Method for Natural Gas Storage at High Capacities Using TOPSIS Method9182016110.22108/gpj.2013.20161ENAlirezaSanaeiSchool of petroleum and geological Engineering, University of Oklahoma, USASeyed HamidrezaYousefiDepartment of Petroleum Engineering, Amirkabir University of Technology, IranEhsanKhamehchiDepartment of Petroleum Engineering, Amirkabir University of Technology, IranJournal Article20160615Nowadays<br /> one of the most important energy sources is natural gas. By depletion of oil reservoirs in the world, natural gasÂ will emerge as the future energy source for<br /> human life. One of the major concerns of gas suppliers is being able to supply<br /> this source of energy the entire year. This concern intensifies during more<br /> consuming seasons of the year when the demand for natural gas increases,<br /> resulting in a lot of problems such as pressure depletion in the pipelines. One<br /> of the most effective policies to prevent pressure depletion is gas storage in<br /> warm seasons of the year when public demand is low. In this paper three<br /> different methods of underground and surface gas storage at high capacities<br /> have been discussed which are as follows: depleted oil and gas reservoirs,<br /> liquefied gas storage, and gas hydrates storage. In this study, the NPV<br /> function for economical evaluation of these three natural gas storage methods<br /> was employed. Finally, after assessing the technical and economical aspects of<br /> these methods, the TOPSIS model was constructed and depleted oil and gas<br /> reservoirs storage selected as the best natural gas storage method at high<br /> capacities.http://gpj.ui.ac.ir/article_20161_e6cc8e5a259d810d54bb012071e8d24b.pdfUniversity of IsfahanGas Processing Journal2322-32511120130101The Design of the Best Heat Integrated Separation Systems Using Harmony Search Algorithm19402016210.22108/gpj.2013.20162ENGholam RezaSalehiIslamic Azad University Branch of Nowshahr, Iran0000-0002-7866-358XMajidAmidpourEnergy System Engineering Department, K.N.Toosi University of Technology, IranBahramGhorbaniEnergy System Engineering Department, K.N.Toosi University of Technology, IranKazemHasanzadeh LashkajaniEnergy System Engineering Department, K.N.Toosi University of Technology, IranJournal Article20160615The<br /> synthesis of heat integrated multi-component distillation systems is complex<br /> due to its huge search space for structural combination and optimization<br /> computation. To provide a systematic approach and tools for the synthesis<br /> design of distillation systems, a new method for modeling heat integrated columns<br /> is presented, and the operating cost objective function is minimized by<br /> improved harmony search algorithm (IHS). This paper studies a quick method for<br /> the synthesis of heat integrated distillation column sequences and IHS -based<br /> optimization strategy for the optimization of separation sequences with their<br /> heat integration.Â http://gpj.ui.ac.ir/article_20162_439ea12ae7b36ea933e2dc029c2115fe.pdfUniversity of IsfahanGas Processing Journal2322-32511120130101Predicting the Hydrate Formation Temperature by a New Correlation and Neural Network41502015810.22108/gpj.2013.20158ENHamidrezaYousefiDepartment of Petroleum Engineering, Amirkabir University of Technology, IranEbrahimShamohammadiDepartment of Petroleum Engineering, Amirkabir University of Technology, IranEhsanKhamehchiDepartment of Petroleum Engineering, Amirkabir University of Technology, IranJournal Article20160615Gas hydrates are a costly problem when they plug oil and gas pipelines. The best way to determine the HFT and pressure is to measure these conditions experimentally for every gas system. Since this is not practical in terms of time and money, correlations are the other alternative tools. There are a small number of correlations for specific gravity method to predict the hydrate formation. As the hydrate formation temperature is a function of pressure and gas gravity, an empirical correlation is presented for predicting the hydrate formation temperature. In order to obtain a new proposed correlation, 356 experimental data points have been collected from gas-gravity curves. This correlation is programmed and assessed with respect to its capabilities to match experimental data published in the literature under varying system conditions (i.e. temperature, pressure, and composition).The SPSS software has been employed for statistical analysis of the data. In order to establish a method to predict the hydrate formation temperature, a new neural network has also been developed with the BP(Back Propagation) method. This neural network model enables the user to accurately predict hydrate formation conditions for a given gas mixture, without having to do costly experimental measurements.http://gpj.ui.ac.ir/article_20158_b01023a76a34375e55ef613e5f004495.pdfUniversity of IsfahanGas Processing Journal2322-32511120130101The Design and Optimization of Distillation Column with Heat and Power Integrated Systems51682016310.22108/gpj.2013.20163ENGholam RezaSalehi3Islamic Azad University Branch of Nowshahr, Iran0000-0002-7866-358XBahramGhorbaniBahram Ghorbani, PhD candidate
Mechanical Engineering Faculty, Energy Conversion Group
KNToosi University of technology, Tehran, Iran,
Bahram330ghorbani@gmail.comKazemHasanzadeh LashkajaniEnergy System Engineering Department, K.N.Toosi University of Technology, IranMajidAmidpourEnergy System Engineering Department, K.N.Toosi University of Technology, IranJournal Article20160615Based on two<br /> integration steps, an optimization framework is proposed in this work for the<br /> synthesis and design of complex distillation sequence. The first step is to<br /> employ heat integration in sequence and reduce the heat consumption and total<br /> annual cost of the process. The second one is to increase the exergetic<br /> efficiency of sequence by generating power in implemented expanders in<br /> sequence. The profit of power generation directly affects the operating cost of<br /> the process and decreases the total annual cost. In each step, the target is to<br /> minimize the objective function of total annual cost. A simulator is used to<br /> simulate the equipmentâs specification and formulate the objective function of<br /> cost. Results from employing these two integration steps for the considered<br /> case study show the advantages of such a complex distillation sequence with<br /> heat integration and power generation. The results represent a very high<br /> improvement for the sequence Indirect since the properties of the intake flow<br /> to the process are in a way that in this sequence not only do we have a high<br /> freedom for carrying out heat integration, but a large amount of power is also<br /> produced between the columns due to having high flow rate flows between the<br /> columnshttp://gpj.ui.ac.ir/article_20163_6587325a8883837189d6101ef0033303.pdfUniversity of IsfahanGas Processing Journal2322-32511120130101The Indication of Two-Phase Flow Pattern and Slug Characteristics in a Pipeline Using CFD Method70872015910.22108/gpj.2013.20159ENElaheBahramifarRahbarRahimiMaryamMazarei SotoodehJournal Article20160615Multiphase flows are commonly encountered in oil and gas industries. The transport of multiphase flow causes the formation of slug, the increase of pressure drop and the possibility of phase changes therefore, a set of simulation runs was performed to predict flow regimes in a horizontal pipeline, and the results were compared with the Baker chart. The effects of small downward inclinations of pipelines on the formation of slugs were also considered.Volume of Fluid model (VOF) has been used to predict the flow regimes in a horizontal pipeline within an 8-cm diameter and 7-m length pipe. In order to identify the critical parameters of slug flow (mean slug frequency, slug translational velocity, hold up and pressure drop), the simulations were carried out in a 7.63-cm diameter and 5-m length pipe mounted with three different inclination angles of 0 ,-0.5 and -0.8 . A good agreement between CFD model and experimental data has shown the advantage ofÂ Â VOF model for studying two-phase flows.http://gpj.ui.ac.ir/article_20159_e0cd5b37c713a41c2751bb1b193b8776.pdf