مدل‌سازی راکتور بازیابی در فرایند شکست کاتالیستی بستر سیال

نوع مقاله : مقاله پژوهشی

چکیده

در این تحقیق بر اساس یک مدل جامع ریاضی، راکتور بازیابی فرایند شکست کاتالیستی بستر سیال مدل سازی شد. در این مدل، راکتور بازیابی به دو ناحیه متراکم و رقیق تفکیک شد که در هر ناحیه معادلات جرم و انرژی به صورت همزمان حل می‌شود. سینتیک در نظر گرفته شده که بیانگر واکنش‌های روی داده در راکتور بازیابی است، شامل دو واکنش احتراق کک و دو واکنش احتراق منوکسید کربن از دو مسیر هموژن و هتروژن می‌باشد.با درنظر گرفتن واکنش‌های روی داده در رآکتور بازیابی و با حل همزمان معادلات جرم و انرژی، مدل‌سازی فرایند شکست کاتالیستی بستر سیال در راکتور بازیابی از طریق تهیه کد کامپیوتری آن با استفاده از نرم افزار MATLAB انجام گرفت. سپس در شرایط عملیاتی مختلف، نتایج مدل‌سازی با داده‌های تجربی موجود در مقالات و همچنین داده‌های به‌دست آمده از پایلوت موجود در پژوهشگاه مقایسه شدند. نتایج این مقایسه نشان می‌دهد که مدل‌سازی فرایند این تحقیق، قادر است با دقت بالایی عملکرد سیستم را در شرایط عملیاتی متفاوت پیش‌بینی و تغییرات غلظتی اجزاء مختلف در طول راکتور و همچنین در خروجی راکتور را محاسبه کند

کلیدواژه‌ها


عنوان مقاله [English]

Mathematical Modeling of Regenerator Reactor in Fluidized Catalytic Cracking Process

چکیده [English]

In this study, based on a comprehensive mathematical model, a regenerator reactor in fluidized catalytic cracking unit is modeled. In this model, the regenerator is divided into two sections, namely dense and dilute sections; in each section, mass and energy balance for all components are solved simultaneously. The kinetics of reactions happened in regenerator consists of two reactions for coke combustion and two reactions for combustion of carbon monoxide via homogenous and heterogonous routes. After process modeling and computer programming in MATLAB, the modeling outputs are compared by experimental data presented in the literature as well as experimental data obtained from a pilot plant in our research center. The results show that mathematical modeling can predict system performance in different operating conditions with high accuracy and there is good agreement between the modeling predictions and the experimental data.

کلیدواژه‌ها [English]

  • Regenerator Reactor
  • Modeling
  • Fluidized Catalytic Cracking Process
  • Kinetic
منابع
[1]. Han,I.S., Chuang,C.B. & Rigges,J.B., “Modeling of a fluidized catalytic cracking process”, Comp. Chem. Eng., Vol. 24, pp. 1681-1687, 2000.
[2]. Mcfarlane,R.C., Reineman,R.C., Bartee,J.F. & Georgakis,C., “Dynamic simulator for a model IV fluid catalytic cracking unit”, Comp. Chem. Eng., Vol. 17, pp. 275-300, 1993.
[3]. Arbel,A., Huang,Z., Rinard,I.H., Shinnar,R. & Sapre,A.V., “Dynamic and control of fluidized catalytic crackers. 1. modeling of the current generation of FCC's”, Ind. Eng. Chem.. Res., Vol. 34, pp. 1228-1243, 1995.
[4]. Weekman Jr,V.W., & Nace,D.M., “Kinetics of catalytic cracking selectivity in fixed, moving and fluidized bed reactors”, AIChE J., Vol. 16, pp. 397-404, 1970.
[5]. Weisz,P.B.,& Goodwin,R.D., “Combustion of carbonaceous deposits within porous catalyst particles: III. the CO2/CO product ratio”, J. Catalysis, Vol. 6, pp. 425-430, 1966.
[6] de Lasa, H.I., Errazu,A., Barreiro,E., & Solioz,S., “Analysis of fluidized bed catalytic cracking regenerator models in an Industrial scale unit”, Can. J. Chem. Eng., Vol. 59, pp. 549-553, 1981.
7]. Baudrez, E., Heynderickx, G.J., & Marin, G.B., “Steady-State simulation of fluid catalytic cracking riser reactors using a decoupled solution method with feedback of the cracking reactions on the Flow”, Chem. Eng. Res. Des. Vol. 88, pp. 290-303, 2010.
[8]. Faltsi-Saravelou, O., Vasalos, I.A. & Dimogiorgas, G., “FBSim: A Model for fluidized bed simulation-II. simulation of an industrial fluidized catalytic cracking regenerator”, Comp. Chem. Eng., Vol. 15, pp. 647-656, 1991.
[9]. Theologs, K.N. & Marktos,N.C., “Advanced modeling of fluidized catalytic cracking riser Type reactors”, AIChE J., Vol. 39, pp. 1007-1017, 1993.
[10]. Penteado, J.C., Dynamic modeling of a FCC regenerator, Master Dissertation, Curitiba, Brazil, 2003.
[11]. Elnashaie,S.S.E.H., & Elshishini,S.S., “Digital simulation of industrial fluid catalytic cracking unit IV. dynamic behavior”, Chem. Eng. Sci., Vol. 48, pp. 567-583, 1993.
[12]. Lopez-Isunza,F., “Dynamic modeling of an industrial fluid catalytic cracking unit”, Comp. Chem. Eng., Vol. 16, pp. S139-S148, 1992.
[13]. Ali H., & Rohani S., “Dynamic modeling and simulation of a riser type fluid catalytic cracking unit”, Chem. Eng. Tech., Vol. 20, pp. 118-130, 1997.
[14]. Fernandes, J., Verstraete, J.J., Pinherio, C.C., Oliveria, N. & Riberio, F.R., “Mechanistic dynamic modeling of an industrial FCC unit”, European Symposium on Computer Aided Process Engineering-15, Puigjaner, L., Espuna. A., (Editors), Elsevier, 2005.
[15]. Schwarz, M.P., & Lee, J., “Reactive CFD simulation of an FCC regenerator”, Asia-Pac. J. Chem. Eng., Vol. 2, pp. 347-354, 2007.
[16]. Schwarz, M.P., Lee J., & Witt, P.J., “CFD Modeling of turbulent fluidization in FCC unit strippers”, 5th World Congress on Particle Technology, Orlando, 23-27 April, 2006.
[17]. Zimmermann, S., & Taghipour, F., “CFD Modeling of the hydrodynamics and reaction kinetics of FCC fluidized-bed reactors”, Ind. Eng. Chem. Res., Vol. 44, pp. 9818–9827, 2005.
[18]. Neri, A., & Gidaspow, D., “Riser hydrodynamics: simulation using kinetic theory. A.I.Ch.E.” Journal Vol. 46, pp. 52–67, 2000.
[19]. Trujillo, W.R., & De Wilde, J., “Computational fluid dynamics simulation of fluid catalytic cracking in a rotating fluidized bed in a static geometry”, Ind. Eng. Chem. Res., Vol. 49, pp. 5288–5298, 2010.
[20]. Liua, F., Wei, F., Zhenga, Y., & Jina, Y., “CFD Simulation of fluid catalytic cracking in downer reactors”, China Particuology, Vol. 4, pp. 160-166, 2006.
[21]. Han I.S. & Chung C.B., “Dynamic modeling and simulation of a fluidized catalytic cracking process”. Part I: Process Modeling, Chem. Eng. Sci., Vol. 56, pp. 1951-1970, 2001.
[22]. Weisz, P.B., & Goodwin, R.D., “Combustion of carbonaceous deposits within porous catalyst particles: II. intrinsic burning rate”, J. Catalysis, Vol. 6, 227-236, 1966.
[23]. King, D.F., Estimation of dense bed voidage in fast and slow fluidized beds of FCC catalyst, Fluidization VI, Proceedings of the International Conference on Fluidization, Alberta, Canada, Grace R., et al., Eds.: Engineering Foundation, New York, 1989.
[24]. Han,I.S., & Chung, C.B., “Dynamic modeling and simulation of a fluidized catalytic cracking process. Part II: property estimation and simulation”, Chem. Eng. Sci., Vol. 56, pp. 1973-1990, 2001.
[25]. Morley, K., & de Lasa, H.I. “On the Determination of kinetic parameters for the regeneration of cracking catalyst”, Can. J. Chem. Eng., Vol. 65, pp. 773-777, 1987.