Modeling, simulation, stability analysis and control of a modern fluidized catalytic cracker.
Item
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Title
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Modeling, simulation, stability analysis and control of a modern fluidized catalytic cracker.
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Identifier
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AAI9521279
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identifier
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9521279
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Creator
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Huang, Zupeng.
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Contributor
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Advisers: Reuel Shinnar | Irven H. Rinard
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Date
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1995
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Chemical
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Abstract
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A detailed dynamic and steady-state model of a fluidized catalytic cracker (FCC) has been developed that allows evaluation of the impact of different designs, control configurations, catalyst and feed composition and control strategies on the control of complex system. The ten-lump kinetic model is applied for catalytic cracking reaction. A rigorous combustion kinetic model is developed in regenerator modeling. The FCC model has been validated through industrial contacts. It should be available to process control research community.;By using the model, the present work deals with the existence and stability of multiple steady states and input multiplicity. These are prerequisite conditions for the control design of a large nonlinear system. It is shown that an FCC may exhibit one, three, or even five steady states at the same input conditions. Only the hot stable steady states are needed which lie always in the region of three steady states. The unnecessary unstable and useful stable steady states will converge if close to the stability limit.;Catalyst and feed composition can strongly affect operable space. The results in this work show that the region of hot stable steady states increases with increasing catalyst activity, heavier feed, increasing CO combustion promoter content and increasing feed temperature. CO combustion promoter can eliminate the trend toward five steady states.;The dynamic features that are captured by the model substantially represent the present-day FCC behavior. This dynamic behavior let one design a better controller that make system track the optimum point while regulating against disturbances.;The research work in this thesis should be a useful guide when one treats a complex system in which the number of process variable one would like to control substantially exceeds the number of manipulated variables that are available for the task. That is the so-called "partial control".
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
