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اختيار الافضل للمفاعل النازل لوحدة التكسير بالعامل المساعد == Optimization Technique of Fcc Downer Reactor
Author name:
علي محسن غضبان
Supervisor name:
Safa A. Al | Naimi
General topic:
Chemical Engineering
Specific topic:
Oil Refining and Gas Technology
Degree:
Higher Diploma
University:
University of Technology - Department Of Chemical Engineering - Chemical Engineering and Oil Refining Branch
Language:
English
University location:
Baghdad
First pages:
38T300 - p.pdf
Abstract:
يشتمل البحث على عمل نموذج رياضي لمفاعل النازلdowner) ) في وحدة التكسير المحفز بالعامل المساعد وان التفاعل يشمل اربع مكونات هي التغذية Gas oil)) والغازات الخفيفة (Light gases) والكازولين (Gasoline) والفحم (Coke) اوما يسمى ب Four lumps model لوصف حركة تفاعل | In this work, mathematical model for downer reactor have been developed, in which a four - lump model is used to characterize the feed and the products, where gas oil cracks to give lighter fractions and coke. The integrated reactor steady state model makes gross assumption about the hydrodynamics, using 4th. order Runga Kutta method. Polymath version 5.1 and Aspen version 7.3 programs are used to solve the simulation model. This model can predict the mixing temperature and pressure profiles at mixer (MxR) chamber; also shows the physical performance and productivity all over the downer height. An interactive excel worksheet is constructed and used as a powerful tool for solving the model equations and studying the effect of any change in operating variables on the unit performance. Also observed the simulated results by using two programs (Polymath and Aspen) and the difference between them especially in temperature , pressure and product yield profile plotted along the reactor length and shows that the results from Aspen are better than Polymath because the first is more advanced and accurate. The operation of downer reactor for catalytic cracking is associated with several important objectives such as feed rate and height, diameter of reactor and amount of catalyst rate as well as the production requirements, all of which need to be optimized simultaneously. In this study, a validated mathematical model was used to perform the single - objective optimization of the FCC system at the design stage. In the optimization study, four operating parameters were used as decision variables. These variables were chosen based onsystematic sensitivity analysis of the system which showed complex interplay of the decision variables over the system performance indicators. Elitist Polymath version 5.1 enhanced with Excel flow sheet 2007 were used to solve a number of objective function optimization problems. The objective functions used are maximization of the gasoline yield, and minimization of the catalyst flow rate. The optimal results obtained here provide physical insights that can help in the design stage of the downer reactor.
