پديد آورنده :
اسحقي، نيره
عنوان :
مدل سازي و شبيه سازي واحد نم زدايي گاز طبيعي با استفاده از غربال هاي مولكولي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
مهندسي شيمي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي
صفحه شمار :
پانزده،77ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمدرضا احساني
استاد مشاور :
مسعود حق شناس فرد
تاريخ نمايه سازي :
27/10/89
استاد داور :
احمد محب، نسرين اعتصامي
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Simulation and Modeling of Natural Gas Dehydration Unit Using Molecular Sieves Nayereh Eshaghi E mail n eshaghi80@yahoo com Date of Submission 2010 06 13 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Mohammad Reza Ehsani E mail Ehsanimr@cc iut ac ir Abstract In natural gas refining dehydration is one of the most important processes Many methods exist for dehydration at the present using adsorption as an appropriate process of dehydration of natural gas is being improved In this thesis modeling and simulation of adsorption bed have been done to remove moisture from natural gas using 3A and 5A molecular sieves This process is used in dehydration unit of South Pars Gas Complex Phases 4 5 The gas is dried in two of the three dryers operating in parallel At any time two beds are in adsorption phase and one in regeneration phase In adsorption phase as the gas passes downward through the dryers the water is absorbed by the molecular sieves Required maximum water concentration in the dry gas outgoing dehydration facilities is 0 1 ppm mole In order to dehydration is used 5A molecular sieve and its problem is simultaneous adsorption of mercaptan and water In the modeling process of adsorption considering plug flow with axial dispersion model for gas flow pattern in bed the mass balance equation have been used In this system has been supposed that there are three components mercaptan water and inert component for 5A molecular sieve and there are two components water and inert component for 3A molecular sieve For each component is written a partial mass transfer equation and the overall mass balance equation for the system Adsorption rate is approximated by linear driving force Langmuir isotherm has been used to describe adsorption equilibrium on zeolit adsorbent Simulation has been done in form isotherm The set of partial differential equations of dynamic model is solved using the implicit finite difference algorithm The concentration profiles and pressure profiles are presented in bed length For corroboration of simulation the results are compared with dehydration unit operational data and observed 2 36 error for 5A molecular sieve which shows close corresponding of model with operational data Comparison of two types of molecular sieve in operating conditions indicates that molecular sieve 5A is although somewhat better than 3A molecular sieve but due to the simultaneous adsorption of mercaptan is not suitable for dehydration So this is better that 3A molecular sieve is used in process In order to compare the effects of important operational parameters on system performance were considered 9 case studies for each molecular sieve The results show that the effect of temperature and pressure is negliable on the rate of water adsorption but increasing of bed height with larger molecular sieve decrease adsorption Keywords Adsorption Dehydration molecular sieve
استاد راهنما :
محمدرضا احساني
استاد مشاور :
مسعود حق شناس فرد
استاد داور :
احمد محب، نسرين اعتصامي
