Dynamics of Processes with Recycle: Multifeed Ternary Systems

doi:10.1021/ie051449

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Title:	Dynamics of Processes with Recycle: Multifeed Ternary Systems
Authors:	Hung, Chia-tsung;Chen, Yih-hang;Jeffrey D. Ward;Yu, Cheng-ching
Contributors:	淡江大學化學工程與材料工程學系
Date:	2006-01-01
Issue Date:	2011-05-20 09:56:20 (UTC+8)
Publisher:	American Chemical Society
Abstract:	We explore the dynamics and control of plants with recycle and multiple feed streams under different process designs, taking as an example a ternary system with a second-order irreversible reaction: A + B f 2C. Process transfer function matrices are derived analytically in terms of design variables. It is shown analytically that plants with recycle and multiple feeds are internally unstable systems with a pole at the origin, thus proving Luyben’s conjecture that reactant feed flow rates must be balanced down to the last molecule. Therefore, a feed-ratio control scheme will not work in practice; one of the feed flows must be adjusted via feedback. Remaining candidate control structures are evaluated using linear and nonlinear analysis. Finally, dynamic compensation of the feed flow is applied such that almost perfect production rate control is achieved. Simulation results clearly indicate that the correct control structure can be selected and that almost perfect production rate changes can be achieved.
Relation:	Industrial & Engineering Chemistry Research 45(25), pp.8664-8677
DOI:	10.1021/ie051449
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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