فهرست مطالب

دوماهنامه مهندسی شیمی ایران
پیاپی 16 (خرداد و تیر 1384)

104 صفحه،
تاریخ انتشار: 1384/04/05
تعداد عناوین: 17

فارسی
English

انتخاب همه

Fuel Cells and Hybrid Systems, Future of Power Generating Systems

Mohammad Eslami Page 3

Fossil fuels are exhaustible energy resources that man can not rely on them for a long time. Increasing population urge us to pursue in exhaustible energy resources. On the other extreme, the environment pollution is increasing so rapidly that policy makers have proposed severe laws to protect against pollution and more credits have been devoted to researches in the area of exploiting modern energy resources. As a consequence, development of more efficient and low polluting systems is of great importance. Among these systems, scientists have recently focused on fuel cell as a kind of modern energy systems. This advanced technology not only leads to more efficient and low polluting energy systems, but also with combining fuel cell systems and gas turbines called Hybrid Systems, a new revolution is expected to occur in power generating systems, This may also lead to more focusing on these systems in the areas of research and practice. In this paper, firstly, a review of past applications of fuel cell in power generating systems is provided. Then hybrid systems and their advantages are introduced. Finally some hybrid structures are studied.

Abstract View Paper Original: Persian
Upgrading and Refining of Heavy Oil

Reza Azin Page 12

In this article, the importance of upgrading and refining processes in the exploitation of heavy oil and natural bitumen reservoirs. Also, some common refining and upgrading processes are introduced. The upgrading process can be applied either physically or it may involve chemical reaction. In addition, the upgrading of heavy oil and bitumen may be regarded as a separate stage after heavy oil recovery. On the other hand, applying some EOR processes result in partial in-situ upgrading of heavy oil and bitumen. Also, the upgrading processes should be applied both in the field and in the ordinary refineries. In the later case, the catalysts used in the conversion processes should be should be modified so that they can deal with such heavy compounds as asphaltene normally found in heavy oil and bitumen composition. The product of chemical heavy oil upgrading is the synthesized crude oil (SCO), which is transported to refinery for further processing. The value of products will be higher if a petrochemical plant is included besides the heavy oil refinery in order to produce such petrochemical products as ethylene, propylene, xylene, and styrene.

Abstract View Paper Original: Persian
Analyzing of Tube side Heat Transfer Enhancement Using Computational Fluid Dynamics

Dr. M. R. Jafari Nasr, Dr. H. Pahlavanzadeh, Engr. S. H. Mozaffari Page 20

The effect of tube inserts to enhance heat transfer coefficient and to mitigate fouling rate in shell-and-tube heat exchangers has been investigated by many researchers. In spite of availability of several experimental models for different types of tube inserts, however because of complexity in their geometries, it has not performed mathematical modeling for them yet. In this study, using CFD (Computational Fluid Dynamics), the influence of existence of tube inserts in tubes of a heat exchanger is mathematically analyzed. The Distributions of balk temperature, profile of surface temperature of tube inlet, wall shear stress on surface of tube inlet, velocity and pressure drop are studied. The results of two cases of tubes with and without insert are compared. The experimental conditions for a tube with 3/4 inch of diameter and 0.5 meter of length are considered; 220oC of surface temperature, 0.65 m/s velocity and 80oC of inlet temperature. For an enhanced tube the surface heat transfer coefficient is 590.33 W/m2.K while in the absence of tube insert it yields to 468.06 W/m2.K. In addition, the wall shear stress is 3.705 Pa in existence of tube insert and 2.180 Pa in the absence of tube insert.

Abstract View Paper Original: Persian
petroleum coke, coking process and applications

Hassan Bargozin, Jafarsadegh Moghaddas, Anvar Khudiev, Mohammad Reza Malek Abbaslou Page 29

Delayed coking is a thermal cracking, polymerization and condensation process in which a heavy petroleum feedstock is converted into gases, liquids, and a high carbon solid material called "coke". Based on feedstock’s used in process, several types of products are produced such as: Shot coke, Sponge coke and Needle coke. The physical structure and purity of the coke determines its use.[1] In this article the petroleum coke and its production rate in the world will be surveyed and in the next section the types and applications of petroleum coke in various industries will be reviewed. Increasing the global demand of petroleum, existence of many heavy feedstock's in country, the keeping problems of heavy feedstock's and their pollution problems, importing the petroleum coke and many dependent products are the main reasons, why the funding in construction of delayed coking unit our country seems inevitable. It is necessary to mention that the second section of this survey the delayed coking process and design parameters of process will be surveyed with details. In the third section of this survey chemical reactions in delayed coking process will be discussed.

Abstract View Paper Original: Persian
Necessity of using pilots plants by chemical engineers before designing industrial plants

M. Ayazi, Sh.Amiri Page 37

In this paper, different aspects of a pilot plant are investigated. The main purpose of this investigation is to obtain design and construction procedures, basic rules in the start-up, cost, types, optimum scale selection, and safety aspect also construction materials and location and the following items are emphasized. 1- Close co-operative between chemical engineers and chemists form the beginning of pilot plant activity.2- Reducing of construction and operation of an industrial/plant costs with construction of pilot plants.3- Optimum scale selection of pilot plant.4- Safety aspects on design, construction and operation of pilot plants

Abstract View Paper Original: Persian
Simulation of natural gas dehydration unit on south pars phase 1 offshore platform

M.Akbarzadeh, Dr.S.M.Mousavian, Dr.S.J.Hashemi Page 44

Natural gas coming from reservoirs, in normal condition, is saturated with water vapor. The water vapor has capability of hydrate formation with gas components in transmission lines or process equipment. This phenomena causes a lot of process problems such as corrosion and plugging of transmission lines and equipments.There are wide variety methods for drying of natural gas. This paper, includes explanations on hydrate and its formation conditions and customary methods of gas drying, after that the reader can find the investigation of south pars gas field phase 1 offshore process system followed by above mentioned system simulation by HYSYS.The study also covers evaluation of the effects of various operating parameters on performance of unit in detail. Also a discussion on increasing of system efficiency and functionality based on achieved results can be seen.

Abstract View Paper Original: Persian
Simulation of Mononitrotoluene Isomers Distillation Unit

M. S. Rahbar, A. A. Dakhel Page 55

Mononitrotoluene isomers are important intermediate products which are produced as a mixture in the nitration of toluene. Distillation is one of the most effective methods for separation of mononitrotoluene isomers. In this paper, at the first, the properties of mononitrotoluene isomers and their different separation methods have been reviewed. Then, a semi-batch distillation unit for separation of mononitrotoluene isomers has been simulated by Hysys software. The results show a good agreement between this simulation and the previous practical data. In addition, a continuous distillation unit has been designed for high capacity toluene nitration units. In this unit, variation of temperature, pressure and flow rates have been investigated. The results show that the designed unit can separate the feed to 97% and 99.5% purity for ortho and para isomers, simultaneously.

Abstract View Paper Original: Persian
Sulfid pollution removal methods from produced water

Z.Abbasimazar, J.Shayegan, E.Roayaei Page 66

Produced water from oil wells, contains of soluble sulfide(H2S,HS¯,S¯ ¯), that`s resulted from Sulfate Reducing Bacteria.Existing of sulfide in oil field brine, make a different problems for oil industry,because of its toxicity,odor,corrosion,formation of insoluble metalic sulfides,and also reducing of hydrocarbon quality for sales.There are various methods for removing sulfide from hydrocarbon reservoirs and prevention of related problems.Some of these methods are, natural,Biological, Physical,chemical,….Some of these methods would be assessed in this paper.

Abstract View Paper Original: Persian

علمی مصوب

دوماهنامه مهندسی شیمی ایران

Iranian Chemical Engineering Journal

دوماهنامه فنی مهندسی

آخرین شماره | آرشیو

ISSN: 1735-5400 eISSN: 2008-2797

صاحب امتیاز:

انجمن مهندسی شیمی ایران

مدیر مسئول:

دکتر نوید مستوفی

سردبیر:

دکتر جعفر صادق مقدس

تلفن نشریه: ۰۲۱-۶۶۰۸۲۶۳۷

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فهرست مطالب

دوماهنامه مهندسی شیمی ایران پیاپی 16 (خرداد و تیر 1384)

دوماهنامه مهندسی شیمی ایران

Iranian Chemical Engineering Journal

دوماهنامه مهندسی شیمی ایران
پیاپی 16 (خرداد و تیر 1384)