Improvement of operational flexibility of batch units by a design margin

Oi, Ko; Itoh, Hidenori; Muchi, Iwao

doi:10.1016/0098-1354(79)80030-7

Cited by 12 publications

(7 citation statements)

References 1 publication

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“…The direct precursor to our results are those reported in the pioneering paper by Oi, et al (1979). In this section we briefly discuss the differences and similarities in our treatments.…”

Section: Discussionmentioning

confidence: 75%

“…In this section we briefly discuss the differences and similarities in our treatments. Recall from the Scope section, above, that Oi et al (1979) considered an L-1 system with a downstream continuous unit having a constant processing rate and investigated allowability of single and multiple nonoverlapping starting moment revisions. Specifically, they derived necessary and sufficient conditions for the allowability of these clsses of variations.…”

Section: Discussionmentioning

confidence: 99%

“…Before proceeding further with the development, we recall two important definitions first introduced in the work of Oi et al (1979) and present a preliminary result concerning the initial portion of the holdup function.…”

Section: Allowability Of Variationsmentioning

confidence: 99%

“…Oi et al (1979) adopted this approach to study a system involving L parallel batch units, an intermediate storage facility, and a single downstream continuous unit with either constant or variable processing rate. Conditions were derived which single as well as multiple, nonoverlapping variations in the schedule of the batch units must satisfy to maintain continuity of operation.…”

Section: A Karlml and G V Reklaltls School Of Chemical Engineeringmentioning

confidence: 99%

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Deterministic variability analysis for intermediate storage in noncontinuous processes. Part I: Allowability conditions

Karimi

Reklaitis

1985

AIChE Journal

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Noncontinuous processes involving batch and semicontinuous processing operations are typically subject to significant levels of process parameter variations. Intermediate storage is commonly used to mitigate the effects of these variations. A taxonomy and analysis is presented of the various types of parameter variations: elementary and composite, single and multiple, homogeneous and mixed, overlapping and nonoverlapping. Sufficient conditions are developed which insure that continuity of periodic operation can be maintained in the presence of these various types of process variations. These conditions serve as the basis of storage sizing procedures developed in the companion paper.

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“…The direct precursor to our results are those reported in the pioneering paper by Oi, et al (1979). In this section we briefly discuss the differences and similarities in our treatments.…”

Section: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Section: Allowability Of Variationsmentioning

confidence: 99%

Section: A Karlml and G V Reklaltls School Of Chemical Engineeringmentioning

confidence: 99%

See 2 more Smart Citations

Deterministic variability analysis for intermediate storage in noncontinuous processes. Part I: Allowability conditions

Karimi

Reklaitis

1985

AIChE Journal

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“…Purdue University West Lafayette, IN 47907 patterns or combinations of variations and seeks to eliminate their effects by providing appropriate levels of intermediate storage. Oi et al (1979) adopted this approach to study a system involving L parallel batch units, an intermediate storage facility, and a single downstream continuous unit with either constant or variable processing rate. Conditions were derived which single as well as multiple, nonoverlapping variations in the schedule of the batch units must satisfy to maintain continuity of operation.…”

Section: School Of Chemical Engineeringmentioning

confidence: 99%

Optimal selection of intermediate storage tank capacity in a periodic batch/semicontinuous process

Karimi

Reklaitis

1983

AIChE Journal

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Batch/semicontinuous chemical plants are usually designed either by assuming infinite intermediate storage or by assuming that the units themselves act as storage vessels, while the storage vessel,^ are sized by rules of thumb or experience. In this paper, the case of an intermediate storage vessel which links one upstream batch/semicontinuous unit to one downstream batch/semicontinuous unit is analyzed. The units are assumed to operate with fixed cycle times and capacities. Expressions for determining the minimum storage tank capacity necessary to decouple the two units are derived from a mathematical model of the periodic process. Effects of the relative starting limes of the two units on the required storage capacity are determined, thus suggesting the optimum process timings to minimize the same. Application of the results is illustrated by an example.

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A method for flexibility analysis of continuous processing plants

1991

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A methodology has been developed for the analysis of operational flexibility of a continuous processing plant. An application has been demonstrated for a multipurpose plant with uncertain operating conditions. A practical flexibility analysis procedure using a direct search optimization algorithm is proposed to solve the problem. The method provides a heuristic screening technique that makes it possible to avoid the exhaustive enumeration of every constraint vertex, while the direct search optimization offers a simple and effective means to identify bottlenecks. A refinery multiperiod plant problem has been investigated in order to highlight the procedures which lead to the construction of flexibility indices for each operating mode.

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Improvement of operational flexibility of batch units by a design margin

Cited by 12 publications

References 1 publication

Deterministic variability analysis for intermediate storage in noncontinuous processes. Part I: Allowability conditions

Deterministic variability analysis for intermediate storage in noncontinuous processes. Part I: Allowability conditions

Optimal selection of intermediate storage tank capacity in a periodic batch/semicontinuous process

A method for flexibility analysis of continuous processing plants

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