Feedback Control of a Continuous-Flow Stirred Tank Reactor with Competing Autocatalators

Chaivorapoj, Woraritt; Birol, İnanç; Cinar, A.; Teymour, Fouad

doi:10.1021/ie020427+

Cited by 14 publications

(5 citation statements)

References 16 publications

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“…This can be done either by increasing T to starve Q to death or by decreasing T to wash Q out of the system. The development of a closed-loop implementation of these strategies will be reported elsewhere …”

Section: Discussionmentioning

confidence: 99%

Competition between Robust and Nonrobust Autocatalytic Replicators

Chaivorapoj

Birol

Teymour

2002

Ind. Eng. Chem. Res.

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The competition of two species for a common resource is illustrated using the paradigm of autocatalytic replicators inhabiting a continuous stirred tank reactor (CSTR) environment that is continuously fed with the resource. In most cases presented, one species is robust (appears in reactor feed) while the other is not. The introduction of the second (invading) species into the CSTR via an unsustained disturbance has a strong effect on the steady-state and dynamic behavior of the first (host) species. New steady states are added to the bifurcation diagram that show that the invading species can coexist in the system with the host species when its growth and death characteristics are similar to those of the latter. The population levels of the host species are greatly reduced in these cases as a result of the considerable decrease in resource concentration at steady state. Open-loop strategies for the elimination of the invading species are developed and discussed. These strategies involve the manipulation of the reactor residence time to destabilize the states of coexistence.

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Section: Discussionmentioning

confidence: 99%

Competition between Robust and Nonrobust Autocatalytic Replicators

Chaivorapoj

Birol

Teymour

2002

Ind. Eng. Chem. Res.

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“…Consequently, if the control objective calls for one species to be replaced with another, a nonlinear control scheme must be used. For a single CSTR with competing autocatalytic species, one strategy may be to modify the reactor residence such that the undesirable species is washed out of the system, and then set to an appropriate value that is favorable to the existence of the desired species [5], [6]. Obviously, there is usually more than one strategy to achieve such control objectives.…”

Section: Introductionmentioning

confidence: 99%

Reconfiguration of chemical reactor networks using a hierarchical agent-based system

Artel

Teymour

Çınar

2008

2008 American Control Conference

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Controlling reactors in distributed manufacturing processes producing different grades of a product requires intelligent reconfiguration strategies. Agent-based approaches are ideal for such cases, since they can provide flexible, robust, and emergent solutions during dynamically changing process conditions. A hierarchical, agent-based system with local and global control agents is developed to control networks of interconnected chemical reactors. This paper proposes a multilayered, multiagent framework based on a decentralized approach for the supervision of grade transitions in autocatalytic reactor networks. The values for the manipulated variables are chosen to give the least disturbance to the system. The case studies show that the approach is successful in controlling the reactor network and being able to keep the desired grade even after the need of shutting down some of the reactors.

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“…For a single CSTR with competing autocatalytic species, the reactor residence time must first be modified such that the undesirable species is washed out of the system, and then set to an appropriate value that is favorable to the existence of the desired species [10], [11]. This concept can be extended to systems with many reactors to effectively control the spatial distribution of autocatalytic species in the network.…”

Section: Introductionmentioning

confidence: 99%

Agent-based system for reconfiguration of distributed chemical reactor network operation

Tetiker

Artel

Tatara

et al. 2006

2006 American Control Conference

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Control of spatially distributed systems is a challenging problem because of their complex nature, nonlinearity, and generally high order. Agent-based control structures provide a powerful tool for managing distributed systems by utilizing local and global information obtained from the system. A hierarchical, agent-based system with local and global control agents is developed to control networks of interconnected chemical reactors hosting multiple autocatalytic species. The global controller agent dynamically updates the objective of local control agents as the reactor network conditions change. The case illustrated in this paper is to change the dominant species in one CSTR by modifying feed and interconnection flow rates with the constraint of shortest path possible, which causes the least amount of changes in the whole network. The agent-based system and the reactor networks are implemented using the agent-based system development framework RePast.

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Feedback Control of a Continuous-Flow Stirred Tank Reactor with Competing Autocatalators

Cited by 14 publications

References 16 publications

Competition between Robust and Nonrobust Autocatalytic Replicators

Competition between Robust and Nonrobust Autocatalytic Replicators

Reconfiguration of chemical reactor networks using a hierarchical agent-based system

Agent-based system for reconfiguration of distributed chemical reactor network operation

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