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Design and Cascade Control of a Sieve Tray Absorption Column

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dc.contributor.author Alrayah, Rwan Abdalla Abd Alhafeez
dc.date.accessioned 2018-10-07T07:22:32Z
dc.date.available 2018-10-07T07:22:32Z
dc.date.issued 2013-09-30
dc.identifier.uri http://repo.uofg.edu.sd/handle/123456789/2183
dc.description A Dissertation Submitted to the University of Gezira in Partial Fulfillment of the Requirements for the Award of the Degree of Master of Science in Chemical Engineering Department of Applied Chemistry and Chemical Technology ,Faculty of Engineering and Technology September, 2013 en_US
dc.description.abstract Development of an effective control strategy required that a sieve tray column was to be designed first. The aim of this study is to design a sieve tray absorption column to separate SO2 from air-SO2 mixture. MATLAB soft ware was used in this study in control strategy The optimum dimension of the column were, diameter of 1m, height of 9 m, efficiency of 25% and actual number of stages of 12. Having known the column internals and hydrodynamics a control strategy was proposed. Among the multi-control systems, cascade control of two loops was designed. These were cascading composition of the exit gas mixture through a master controller to transmit a set point to the secondary level controller at the top of the absorption column. A secondary loop of flow rate of the inlet liquid solvent was cascaded with the composition of the secondary controller. A multiple block diagrams of the cascade system were drawn and reduced to a single block diagram. The transfer functions were cited from the literature. A new tuning technique was innovated using direct substitution, Root-locus and Bode plot. These techniques were used to calculate the ultimate gains of the secondary loop from the root locus and Bode plot and used direct substitution to calculate the ultimate gains of the primary loops. The relevant adjustable parameters were calculated using Z-N method. The system stabilities were calculated by Routh method and all of them were found to be stable. The offset was calculated using the tuning parameters obtained by each method of tuning and found to be reasonable . This showed that the tuning methods innovated were in agreement with a direct substitution method. In this study it is recommended to use a Root-locus method to obtain the ultimate gains (Ku2) of the secondary loop and use it to calculate the ultimate gain of the primary loop. This is because, unlike Bode plot, the root-locus gives directly from the plot, the values of (Ku2) and the cross-over frequency and consequently the value of (Ku1). en_US
dc.description.sponsorship Gurashi Abdalla Gasmelsed (Main Supervisor) Imad Eldeen Abdelmoneim Mahjoub (Co-supervisor) en_US
dc.language.iso en en_US
dc.publisher University of Gezira en_US
dc.subject control strategy en_US
dc.subject design a sieve absorption en_US
dc.subject multi-control systems en_US
dc.title Design and Cascade Control of a Sieve Tray Absorption Column en_US
dc.type Thesis en_US


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