Preparation of Papers for IFAC Conferences &amp; Symposia: Integration of Process Design and Control Using Hierarchical Control Structure

Zhou, Mengfei; Li, Long; Xie, Lei; Cai, Yijun; Pan, Haitian

doi:10.1016/j.ifacol.2015.08.179

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…However, the control properties are not considered in a first design stage, as control issues are addressed and solved in a separate and sequential procedure. This design-then-control methodology may present some drawbacks, such as infringement of dynamic restrictions, over-design and low performance, so a global performance of any proposed design cannot be guaranteed [15]. The dynamic consequences lead to separation alternatives that would not be flexible on operative performance.…”

Section: Introductionmentioning

confidence: 99%

Optimal hybrid separations for intensified downstream processing of biobutanol

Sánchez‐Ramírez

Quiroz‐Ramírez

Hernández

et al. 2017

Separation and Purification Technology

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Current research focuses on new energy alternatives which could compete with the traditional energy sources based on fossil fuels, and eventually diminish the consequences on climate. Recently, butanol produced by ABE fermentation attracted more attention since its energy power is comparable to that of gasoline. But some hurdles are involved in the establishment of this fuel as an immediate substitute of fossil fuels, e.g. lower butanol concentration in the fermentation effluents and the expensive separation steps to purify the effluent. This work is the first to report the use of hybrid separation based on liquid-liquid extraction (LLX) combined with dividing-wall column (DWC) technology for the purification of the ABE (acetone-butanol-ethanol) mixture. The configurations proposed are the result of multiobjective optimization that aims to find designs that fulfill the tradeoff between those objectives: cost minimization, reduce environmental impact, and increase controllability. The downstream processing alternatives are designed and optimized by minimizing three objective functions simultaneously: the total annual cost (TAC) as an economical index, the eco-indicator 99 as an environmental function, and the condition number (CN) as control index. Among the four designs, the scheme where only a reboiler is included showed the best economic performances and relatively good values of condition number and eco indicator 99.

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Section: Introductionmentioning

confidence: 99%

Optimal hybrid separations for intensified downstream processing of biobutanol

Sánchez‐Ramírez

Quiroz‐Ramírez

Hernández

et al. 2017

Separation and Purification Technology

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“…Control integration has been successfully employed in other areas including combustion power plants [4] or chemical reactors [5] in which process efficiency and machine protection are vital. In recent years, the fusion community has started to pay attention to the integrated-control problem by developing PCS architectures that include some of the aforementioned components and functionalities [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Integrated control of individual plasma scalars with simultaneous neoclassical tearing-mode suppression

Pajares¹,

Schuster²,

Thome³

et al. 2022

Nucl. Fusion

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Simulations using the Control-Oriented Transport SIMulator (COTSIM) and DIII-D experiments have been carried out to demonstrate the performance of a novel integrated-control architecture for simultaneous regulation of individual-scalar magnitudes. The individual scalars considered in this work include kinetic variables, such as the thermal stored-energy or volume-average toroidal rotation, and magnetic variables such as the safety factor profile at different spatial locations. Separate control algorithms have been designed independently for each of these individual variables that use robust, nonlinear control techniques. In addition, the individual-scalar controllers have been integrated with Neoclassical Tearing-Mode (NTM) suppression algorithms, supervisory and exception handling algorithms, and an actuator manager, both within COTSIM and in the Plasma Control System (PCS) of the DIII-D tokamak. The resulting architecture has a high level of integration and some of the functionalities that will be required to fulfill the advanced-control requirements anticipated for ITER. Initial simulations using COTSIM suggest that the plasma performance and its Magneto-HydroDynamic (MHD) stability may be improved under integrated feedback control. These simulation results also show good qualitative agreement with DIII-D experimental results in the steady-state high-$q_{min}$ scenario, which is one of the candidates for steady-state operation in ITER. By means of individual-scalar feedback-control techniques in conjunction with NTM-suppression techniques, the confinement deterioration caused by NTMs in these scenarios may be significantly ameliorated.

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“…2 Traditionally, process and control design problems are treated sequentially and independently. 9 First, the process design is defined when the process structure is selected, the parameters are determined, and the optimal operating conditions are calculated in a steady state with economic objectives and constraints of the system. 3 Then, the control system is projected based on heuristic rules to reach the desired behavior.…”

Section: ■ Introductionmentioning

confidence: 99%

“…First, the process design is defined when the process structure is selected, the parameters are determined, and the optimal operating conditions are calculated in a steady state with economic objectives and constraints of the system . Then, the control system is projected based on heuristic rules to reach the desired behavior. , However, due to the limitations of constraint violation (which can cause unachievable performance), traditional approaches cannot guarantee robust performance, especially for decisions of the first-stage design. The basic method to reduce these limitations is to overestimate the process and alleviate the effects of the expected disturbances and uncertainties, which can in turn lead to more expensive designs.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Process Design and Control of the Williams–Otto Reactor Using Infinite Horizon Model Predictive Control

Carvalho

Alvarez

2020

Ind. Eng. Chem. Res.

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In this work, we study a simultaneous process design and control methodology using infinite horizon model predictive control (IHMPC). The methodology is based on the change in market conditions caused by the difference in the raw material and product prices. The economic and dynamic objectives are integrated into a single structure in the formulation of the optimization problem. The presented solution divides the problem into three stages and the final problem is solved using two strategies: goal attainment and quadratic cost. In the first two stages, utopian designs are calculated by the isolated solution of economic and dynamic problems. Finally, an integrated problem is solved to achieve the utopian values calculated in the previous stages, in order to produce simultaneously the plant with the best economic and dynamic performance. The results demonstrate the advantages of the methodology for process design, compared with the traditional sequential methodology.

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Preparation of Papers for IFAC Conferences & Symposia: Integration of Process Design and Control Using Hierarchical Control Structure

Cited by 6 publications

References 11 publications

Optimal hybrid separations for intensified downstream processing of biobutanol

Optimal hybrid separations for intensified downstream processing of biobutanol

Integrated control of individual plasma scalars with simultaneous neoclassical tearing-mode suppression

Simultaneous Process Design and Control of the Williams–Otto Reactor Using Infinite Horizon Model Predictive Control

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