Batch unit optimization with imperfect modelling: a survey

Terwiesch, Peter; Agarwal, Mukul; Rippin, D.W.T.

doi:10.1016/0959-1524(94)80045-6

Cited by 113 publications

(66 citation statements)

References 67 publications

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“…These can be utilized for control purposes, simulation, optimization, etc. A typical batch situation is characterized by unsteady-state operation (Terwiesch et al, 1994). Thus, a well-suited model is a function of the physical process unit, product, process and time.…”

Section: IImentioning

confidence: 99%

A concept for modelling batch plant operation

Simensen

Foss

1996

Computers & Chemical Engineering

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-A model for describing batch plant operations based on three basic components is proposed. The three parts represents different views on the problem. The batch objects follow the batch units moving through the plant. The resource objects document relevant features of each process unit. Finally, the control objects include production plans and recipes. We discuss a rationale for this partitioning and argue that our concept gives a complete view of the process for plant operation purposes. The novel feature of the concept is the integration of essential perspectives to the operation of a pharmaceutical batch plant into one structured information model. This model takes a broader view than just process control and might be used as an agent to integrate and coordinate operation tasks to improve plant efficiency.

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Section: IImentioning

confidence: 99%

A concept for modelling batch plant operation

Simensen

Foss

1996

Computers & Chemical Engineering

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“…Although observed reactor runs show the same trends in process behaviour, each specific reactor run also shows its own characteristics: run-to-run variability is observed. Terwiesch et al [4,5] recognized run-to-run variations in their survey, which were probably due to (unmeasured) impurities or up-stream disturbances. An analogy of run-to-run variability can be seen in the behavioural sciences, for example, in pupil performance studies.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical process modeling: Describing within-run and between-run variations

Entink

Fox

Betlem

et al. 2007

Journal of Process Control

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Run-to-run variability is a common problem for modeling batch-wise and semi-continuous operated processes. Although observed reactor runs show the same trends in process behaviour, each specific reactor run also shows its own characteristics. Until now, available modeling methods were unable to describe the observed between run variance. In this paper, we present a hierarchical modeling method to solve this problem. A case study for a semi-continuous operated polymer process is analysed to illustrate the hierarchical modeling approach. It was shown that, using the applied modeling method, it is possible to obtain a model which is robust over several reactor runs and which provides a tool for process analysis. Also, the hierarchical model was shown to be superior to a model which lacked an appropriate description of the differences between reactor runs.

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“…In practical applications, perturbations and uncertainties are present, which may lead to constraint violation or non-optimal operation. To satisfy the constraints despite uncertainty, conservative input trajectories that guarantees feasibility needs to be found (Terwiesch et al, 1994). However, such a conservative strategy is, in most cases, non-optimal.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Measurement-Based Optimization Schemes for Batch Distillation

Welz

Srinivasan

Bonvin

2002

IFAC Proceedings Volumes

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The standard approach to deal with uncertainty in dynamic optimization is to take a conservative stand. Measurement-based optimization schemes allow reducing this conservatism by using measurements to compensate for the uncertainty. On the example of the productivity optimization of a batch distillation column with a terminal quality constraint, various model-based and model-free optimization schemes are compared. They all use measurements to update the input from batch-to-batch or within a batch. A novel mid-course correction scheme for satisfying the terminal constraint is proposed.

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Batch unit optimization with imperfect modelling: a survey

Cited by 113 publications

References 67 publications

A concept for modelling batch plant operation

A concept for modelling batch plant operation

Hierarchical process modeling: Describing within-run and between-run variations

Evaluation of Measurement-Based Optimization Schemes for Batch Distillation

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