University of Khartoum

Mathematical Modeling and Temperature Control of A Continuous Stirred Tank Reactor (Cstr)

Mathematical Modeling and Temperature Control of A Continuous Stirred Tank Reactor (Cstr)

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Title: Mathematical Modeling and Temperature Control of A Continuous Stirred Tank Reactor (Cstr)
Author: Ahmed, Sara Saad Awad Mohamed
Abstract: It has been claimed that the best way to compensate for disturbances affecting the reaction temperature in a Continuous Stirred Tank Reactor (CSTR) is to cascade the temperature controller of the reactants with the temperature controller of the coolant when the reaction is exothermic. However, this strategy does not always work and sometimes the cascade control will not improve the tightness of the control system. This is due to the facts that the heat transfer process is slow and that the transportation lag is longer than the time constant of the slave process in addition to a fact that the primary and secondary time constants of these processes do differ much. Therefore, the aim of this study is to see whether a cascade control is significantly effective than the normal feedback control. Two controller configurations were proposed for controlling the temperature of the reaction in a Continuous Stirred Tank Reactor (CSTR). The first configuration is the normal single feedback controller, the other configuration is to cascade the reaction temperature inside the reactor with the temperature of the coolant in the jacket round the reactor. For each configuration Frequency Analysis, Routh Array and Bode methods are applied so as to determine the best controller performance. The comparison through frequency, Routh and Bode shows that the feedback control is ever better. It gave a high gain and same period of oscillation. The study also showed a considerable difference between methods of tuning i.e., between frequency, Bode and Routh. It is recommended that for heat transfer processes such as exothermic and endothermic reactions, a single feedback controller will be as effective as the cascade controller due to the sluggishness of the response of the heat transfer process.
Description: 98page
URI: http://khartoumspace.uofk.edu/handle/123456789/9989
Date: 2015-04-30


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