Distillation Control System Structures

Waller, Kurt V.

doi:10.1016/b978-0-08-034917-6.50005-2

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…This paper addresses the important issue of control configuration selection for distillation columns, that is, which two independent variables to use for composition control. The issue has been discussed for quite some time by industrial people (Shinskey, 1967(Shinskey, , 1984McCune and Gallier, 1973), but has only recently been treated rigorously by academic researchers (Waller, 1986;Takamatsu et al, 1987;Skogestad and Morari, 1987a). In many ways, this paper attempts to answer some of the questions raised by Skogestad and Morari (1987a).…”

Section: Introductionmentioning

confidence: 95%

Selecting the best distillation control configuration

1990

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The selection of an appropriate control configuration (structure) is the most important decision when designing distillation control systems. The steady state RGA is commonly used in industry for selecting the best structure. One counterexample to the usefulness of this measure is the DB configuration, which has infinite steady state relative gain array (RGA) values, but still good control performance is possible. This is indicated by high-frequency RGA values close to 1. In this paper it is stressed that decisions regarding controller design should be based on the initial response (high-frequency behavior) rather than the steady state.Based on a frequency-dependent RGA analysis and optimal PI controller designs of four different configurations, the (L/D) (V/B) configuration is found to be the best choice for two-point composition control. The conventional LV configuration performs poorer than the above system, but is preferable if one-point control is used. AIChE JournalMay 1990 Sigurd Skogestad Petter Lundstriim Elling W. JacobsenChemical Engineering Norwegian Institute of Technology (NTH) N-7034 Trondheim, Norway Figure 1. Two-product distillation column with single feed and total condenser.

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Section: Introductionmentioning

confidence: 95%

Selecting the best distillation control configuration

1990

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“…Niederlinski (1971) proposed a heuristic method based on a generalization of the classical single-loop tuning method of Ziegler and Nichols (1942) to tune multiloop PID controllers. The method has not gained wide acceptance because of its complexity and some reports of poor performance (Waller, 1984). Luyben (1986) proposed the biggest log modulus tuning (BLT) method for multiloop PI controllers.…”

Section: Introductionmentioning

confidence: 99%

Sequential Design Method for Multivariable Decoupling and Multiloop PID Controllers

Shiu

Hwang

1998

Ind. Eng. Chem. Res.

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Underlying algorithms for designing multivariable decoupling and multiloop PI/PID controllers in a sequential fashion are addressed. A single-loop technique, composed of biased relay identification schemes and tuning formulae leading to the minimum weighted integral of square error, is developed to tune each loop in the predetermined sequence of loop closing. The proposed tuning technique is appropriate for a wide range of process dynamics in a multivariable environment. A method is then proposed to design decouplers to compensate for the effect of interactions and tune the resultant weakly interacting, single-loop PI/PID controllers sequentially. The decouplers, together with the single-loop controllers, constitute the multivariable decoupling controller. If the interactions are not significant, multiloop PI/PID controllers, which do not incorporate decouplers, could be employed. Simulation and comparative results are shown for one 2 × 2 and one 3 × 3 multivariable system from the literature. Despite its simplicity, the proposed design method yields superior multivariable designs on the basis of performance, robust stability, and integrity.

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Distillation Control System Structures

Cited by 2 publications

References 17 publications

Selecting the best distillation control configuration

Selecting the best distillation control configuration

Sequential Design Method for Multivariable Decoupling and Multiloop PID Controllers

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