Distillation column controllability analysis through heat pump integration

Karami, Ghazal; Amidpour, Majid; Sheibani, Bijan Heidari; Salehi, Gholamreza

doi:10.1016/j.cep.2015.08.005

Cited by 20 publications

(5 citation statements)

References 45 publications

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“…Therefore, a computational analysis of the open loop is required to solve the coupling problem between the control loops before determining the control scheme. Karami et al 25 discussed the controllability of distillation column with heat pump integration and evaluated the process using seven indices in the steady-state condition. In this work, three controllability indices, including RGA, Niederlinski index (NI), and condition number (CN), are selected to evaluate the inherent ability of the RDWC system to resist disturbances.…”

Section: Methodological Interpretationmentioning

confidence: 99%

“…The information about the controller parameters is not required during calculations. 25,29 NI is defined as the ratio of the determinant of the open loop gain array to the product of its main diagonal elements and obtained by the following equation:…”

Section: Methodological Interpretationmentioning

confidence: 99%

“…NI is another analytical method used to estimate the stability of a control configuration during the initial design stage. The information about the controller parameters is not required during calculations. , NI is defined as the ratio of the determinant of the open loop gain array to the product of its main diagonal elements and obtained by the following equation: …”

Section: Methodological Interpretationmentioning

confidence: 99%

See 2 more Smart Citations

Controllability, Energy-Efficiency, and Safety Comparisons of Different Control Schemes for Producing n-Butyl Acetate in a Reactive Dividing Wall Column

Pan

Shang

et al. 2019

Ind. Eng. Chem. Res.

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Reactive dividing wall column (RDWC) is the integration of reactive distillation and dividing wall column, which simultaneously has the advantages of both process intensification techniques. However, due to the strong coupling and nonlinear characteristics, the research of RDWC is still insufficient in terms of control and operation. Moreover, the energy-efficiency and safety analysis of the process should be also considered when studying the control configuration of RDWC. In this paper, the process of producing n-butyl acetate in a reactive dividing wall column is taken as a study case. On the basis of the controllability index and exergy analysis method of steady-state process, the basic control structure with robust stability and energy-efficiency is selected. Five proportional-integral (PI) control schemes are further established on the preferred basic control configuration. Integral absolute error (IAE) and process route index (PRI) are applied as evaluation criteria to test the operability and hazard of the system in dynamic simulation, respectively. The results show that the CS1 control structure has the best stability compared with other control schemes, but its safety performance is the worst. The CS4 control structure combines controllability, energy-efficiency, and safety through a comprehensive analysis, which can be used as the preferred control scheme.

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Section: Methodological Interpretationmentioning

confidence: 99%

Section: Methodological Interpretationmentioning

confidence: 99%

Section: Methodological Interpretationmentioning

confidence: 99%

See 1 more Smart Citation

Controllability, Energy-Efficiency, and Safety Comparisons of Different Control Schemes for Producing n-Butyl Acetate in a Reactive Dividing Wall Column

Pan

Shang

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Another possible way is the use of de-couplers, this method and similar to the first presents very good results in the theoretical part but in the realisation part still face many difficulties (Garrido et al 2012). The design modification is a new way to improve control system performance and minimize the energy consumption through favorable equipment design (Barolo and Guarise 1996;Sodré et al 2000;Zumoffen et al 2013;An et al 2015;Karami et al 2015). In the present paper we will use design modification by augmenting the hold-up in the feed tray of seven (7) plates Benzene-Toluene distillation column, as a tool to improve the control performance and getting small level of interactions in five most known control & Riad Bendib bendib_r@yahoo.com schemes: (LV), (DV), (LB), (L/D,V/B) and Ryskamp's.…”

Section: Introductionmentioning

confidence: 95%

Contribution to improve the dynamic control of a binary distillation column

Schulte

Bentarzi

2016

Int J Syst Assur Eng Manag

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Conventionally, steady state design for distillation column is often completed before dynamics and control issues are considered. The aim of this paper is to use the design issues as a tool to improve dynamic behavior of binary distillation column. The idea is augmenting the liquid holdup in the feed plate through a middle vessel. The degree of interactions between the loops are examined for five well known control schemes by considering different quantities of liquid holdup in the feed plate. Simulation results show that augmenting the hold-up in the feed plate will lead to minimize the interactions between the loops in all cases particularly for DV control scheme where a total decoupling is achieved.

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“…Hosgor et al proposed a pressure-compensated temperature control structure to control the pressure. In addition, studies on dynamic control for extractive distillation, ,− reactive distillation, ,, batch distillation, , and other separation methods − have received increasing attention; until now, there have been few reports on the dynamic control of TCPSD . Because of the relatively high number of operating parameters and the interactions within multicomponent systems, designing the required control structure is difficult and complex.…”

Section: Introductionmentioning

confidence: 99%

Heat Integration and Control of a Triple-Column Pressure-Swing Distillation Process

Zhu

Jia

et al. 2017

Ind. Eng. Chem. Res.

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Heat integration and dynamic characteristics are critical for the triple-column pressure-swing distillation (TCPSD) processes that are used to separate ternary or multicomponent systems. In this study, rigorous steady-state simulations of heat-integrated TCPSD processes are optimized using Aspen Plus, and dynamic strategies for the different TCPSD processes are explored using Aspen Dynamics. When ±20% feed flow rates and composition disturbances are introduced, the composition/temperature cascade control structure (CSB), which uses stage 19 as the temperature-sensitive stage in the second column, exhibits better controllability than the CSA, which uses stage 4 as the temperature-sensitive stage. Three cases of partial heat integration are studied, and the first case, which uses an auxiliary condenser, is the most economic. The dynamic control strategies of the first and second cases handle ±10% feed disturbances well; however, the CSE can attain good controllability when ±20% feed disturbances are introduced. For the fully heat-integrated TCPSD process, the CSG exhibits good controllability for ±20% feed disturbances. The time that the control structures require to reach new steady states varies greatly for different heat-integrated processes.

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Distillation column controllability analysis through heat pump integration

Cited by 20 publications

References 45 publications

Controllability, Energy-Efficiency, and Safety Comparisons of Different Control Schemes for Producing n-Butyl Acetate in a Reactive Dividing Wall Column

Controllability, Energy-Efficiency, and Safety Comparisons of Different Control Schemes for Producing n-Butyl Acetate in a Reactive Dividing Wall Column

Contribution to improve the dynamic control of a binary distillation column

Heat Integration and Control of a Triple-Column Pressure-Swing Distillation Process

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