Design of resilient processing plants—VII. Design of energy management system for unstable reactors—new insights

Morari, Manfred; Grimm, W.M.; Oglesby, M.J.; Prosser, I.D.

doi:10.1016/0009-2509(85)80058-0

Cited by 59 publications

(25 citation statements)

References 7 publications

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“…The structure in the dashed box is the decoupler, where it can be seen that a feedback loop is used instead of a single decoupler matrix. The decoupler of inverted decoupling can be obtained by Equation (4). Substituting Equation (4) into Equation (1), the decoupler has to satisfy Equation (5):…”

Section: Inverted Decoupling For Non-square Processesmentioning

confidence: 99%

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Analytical design 2 DOF IMC control based on inverted decoupling for non‐square systems with time delay

Jin

Wang

et al. 2016

Can J Chem Eng

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Non-square systems which have more inputs than outputs are difficult to control because of their special structure. In this article, inverted decoupling is extended to non-square systems and an effective dynamic decoupling effect is achieved. The method to obtain realizable and stable decoupler matrices is provided. Based on the decoupled processes, the 2 DOF (degrees of freedom) controllers consisting of feedback filters and reference controllers are designed and then the performances for the reference response and the disturbance response are improved simultaneously. The feedback filters are designed based on the trade-off between robustness and performance for input disturbance rejection. The reference controllers are designed in line with the IMC principle. To restrain overshoot, a requirement on the system maximum singular is proposed and the parameters of the reference controllers are determined based on the requirement. Simulation studies are provided to demonstrate the effectiveness of this method.

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Section: Inverted Decoupling For Non-square Processesmentioning

confidence: 99%

“…Since squaring down the non-square systems may deteriorate the performance and robustness, [4,5] some control strategies based on the original non-square systems are proposed. Chang and Yu extended the relative gain array (RGA) to non-square systems to fulfill variables pairing.…”

Section: Introductionmentioning

confidence: 99%

Analytical design 2 DOF IMC control based on inverted decoupling for non‐square systems with time delay

Jin

Wang

et al. 2016

Can J Chem Eng

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“…Further, the measure represented in equation (9 ) maintains the physical meaning of control input energy, thus it can be a useful measure of degree of disturbance rejection capability for marginally stable systems.…”

Section: Time Averaged Gradient Of Gramiansmentioning

confidence: 99%

Degree of disturbance rejection capability for linear marginally stable systems

Lee

Park

2015

2015 15th International Conference on Control, Automation and Systems (ICCAS)

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Controllability is a structural property that carries information useful for control system design such as actuator placement. There are several measures to determine the locations and types of actuators, and one of them is degree of disturbance rejection capability (DODR) which is a quantitative measure representing how controllable the system is under the presence of persistent disturbance. However, it is hard to obtain the steady-state solution of DOOR if the system is marginally stable because of several problems such as singularity and intensiveness of computation to obtain the Gramians. Thus, this problem to apply the measure to marginally system still remains. In this paper, therefore, the way to apply DOOR to marginally systems with simple calculation is proposed. The definition of the measure is same with existing measure of DODR. We used a novel concept of time averaged gradient of Gramians to calculate the steady-state solution of DO DR .

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“…Introduced by Morari et al (1985), the resiliency of the HEN can be determined by the maximum disturbance range, also known as Resiliency Index (RI), such that for a maximum disturbance range, feasible operation is achieved. RI is mathematically denoted by the following:…”

Section: Resiliency Indexmentioning

confidence: 99%

Towards Integrated Process and Control System Synthesis for Heat-Integrated Plants

Young

Tellez²,

Svrcek

2008

Can. J. Chem. Eng.

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streams (where possible); in other words, a HEN should be designed for this process. Several techniques have been proposed for synthesis of HENs. Some of them are based on thermodynamic insights, such as those methodologies based on Pinch Analysis (Linnhoff and Hindmarsh, 1983;Linnhoff and Ahmad, 1990), and others are based on mathematical programming (Cerda and Westerberg, 1983;Floudas et al., 1986;Briones and Kokossis, 1999). Figure 2a shows the fl ow sheet for a heat integrated process, where a HEN was designed for the maximum energy Most chemical processes are networks of different pieces of equipment, as reactors, distillation columns, compressors, heat exchangers, etc. Process integration is an area of chemical engineering that deals with the optimal design of these networks, from the point of view of energy effi ciency, capital costs, emissions reduction, waster water minimization, and raw materials usage. Until recently, engineers developed conceptual process designs by experience and intuition, however, with the establishment of process integration methodologies, this activity can be performed systematically.One of the subjects that have received the most attention from researchers in this area is the steady state design of Heat Exchanger Networks (HENs). Several tools have been developed and are in use; however, the development of a tool for synthesis of HENs that takes into account network controllability is not available. Hence, the purpose of this paper is the development of a new methodology for design of heat-integrated chemical processes, particularly HENs where controllability and energy recovery are both balanced during the design synthesis stage.La plupart des procédés chimiques sont des réseaux de différentes pièces d'équipement, comme des réacteurs, des colonnes à distiller, des compresseurs, des échangeurs de chaleur, etc. L'intégration des procédés est un domaine du génie chimique qui s'occupe de la conception optimale de ces réseaux, en termes d'effi cacité énergétique, de coûts en capital, de réduction des émissions, de minimisation des eaux usées et de l'utilisation des matières premières. Jusqu'à récemment, les ingénieurs créaient des procédés conceptuels par expérience et intuition, mais avec la venue des méthodologies d'intégration des procédés, ce travail peut se faire de façon systématique. L'un des sujets qui depuis peu attire le plus l'attention des chercheurs dans ce domaine, c'est la conception à l'état stable de réseaux d'échangeurs de chaleur (HEN). Plusieurs outils ont été mis au point et sont employés : cependant, on n'a pas encore mis au point un outil pour la synthèse des HEN qui tienne compte de la contrôlabilité des réseaux. Ainsi, cet article vise à élaborer une nouvelle méthodologie pour la conception des procédés chimiques intégrés thermiquement, en particulier les HEN pour lesquels la contrôlabilité et la récupération d'énergie sont toutes deux équilibrées durant la phase de synthèse de la conception.

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Design of resilient processing plants—VII. Design of energy management system for unstable reactors—new insights

Cited by 59 publications

References 7 publications

Analytical design 2 DOF IMC control based on inverted decoupling for non‐square systems with time delay

Analytical design 2 DOF IMC control based on inverted decoupling for non‐square systems with time delay

Degree of disturbance rejection capability for linear marginally stable systems

Towards Integrated Process and Control System Synthesis for Heat-Integrated Plants

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