Vibrational Control of Chemical Reactors: Stabilization and Conversion Improvement in an Exothermic CSTR

Çınar, Ali; Rigopoulos, K.; Shu, Xinyu; Meerkov, Semyon M.

doi:10.1080/00986448708912002

Cited by 11 publications

(3 citation statements)

References 15 publications

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“…The proximity of the two residence times depends on the operating conditions. For some operating conditions, the upper branch of the average temperature curve intersects the unstable portion of the steady state curve of the system with fixed inputs (Cinar et al, 1987b) and enables forced periodic stabilization at the same residence time.…”

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confidence: 99%

“…The variation in frequency causes dramatic changes when there is a phase shift, Figure 3c. Other factors, such as the ratio of maximum to minimum flow rate, have also been studied (Cinar et al, 1987b). As the flow rate ratio is increased the average steady state curve moves away from the steady state profile of the system with stationary inputs.…”

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confidence: 99%

“…The preliminary theoretical results (Cinar et al, 1987b) indicated that the interaction of various oscillating inputs may cause significant reductions in output oscillations. Multiple oscillating inputs also enabled the separation of the average concentration and temperature curves, as illustrated in Figure 6).…”

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confidence: 99%

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Forced periodic control of an exothermic CSTR with multiple input oscillations

1988

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Interaction among various oscillating inputs may result in significant modifications in the behavior of a system under forced periodic control.Forced oscillations in the input flow rate and input concentrations of an exothermic continuous stirred tank reactor enable the stabilized operation of the CSTR in the unstable steady state region. Reactor temperature oscillations under forced periodic control are similar to the oscillations resulting from proportional-integral feedback or nonlinear (push-pull) feedback control, and under some operating conditions the oscillation amplitude is significantly lower. Theoretical and experimental studies illustrate the effects of forcing frequency and phase shift on reactor behavior. Konstantinos Rigopoulos Xianshu Shu Ali CinarDepartments of Chemical and Electrical Engineering Illinois Institute of Technology Chicago, IL 60616 IntroductionForced periodic operation of chemical reactors has been used effectively for conversion improvement, selectivity, and yield enhancement in complex reactions and the stabilization of reactor operation. References to various review papers, different analysis techniques developed, and applications reported are given by Cinar et al. (1987a). Recently there has been a revival of interest in periodically forced systems. Promising experimental results on yield improvement in catalytic reactions have been reported (Cutlip, 1979, Jain et al., 1982Wilson and Rinker, 1982;Barshad and Gulari, 1985,1986;Silveston et al., 1986). A technique based on the Carleman linearization of nonlinear plant equations and the maximization of a time-averaged performance measure has been proposed (Lyberatos and Svoronos, 1987) for determining the optimal periodic operation and has been applied to an isothermal reactor model for the selection of the best forcing frequency, amplitude, and waveform. Common features of periodically forced reacting systems, particularly properties of spontaneously oscillating systems that are forced periodically, have been considered (Kevrekidis et al., 1986) and an algorithm using stroboscopic representation has been presented for the numerical computation and stability analysis of invariant tori. In stabilizing reactor operation by periodic forcing, the vibrational control approach has provided successful theoretical and experimental results (Cinar et al., 1987a, b).Vibrational control (Meerkov, 1982) is a method for modification of the dynamic properties of a system by introducing fast,

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Forced periodic control of an exothermic CSTR with multiple input oscillations

1988

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2005

Cyclic Separating Reactors

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Nonlinear predictive control of periodically forced chemical reactors

1993

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A nonlinear model-predictive control strategy is developed to maintain the superior-to-steady-state performance of a periodically forced chemical reactor. The performance of the predictive controller is investigated in the presence of measurement disturbances and parametric uncertainty. It is also shown that statistically inferred input-output models can be a substitute whenever detailed fundamental models are not available. A nonlinear autoregressive polynomial model based on observed plant data is built and incorporated into the control scheme, The catalytic oxidation of ethylene in a periodically-forced, continuous stirred-tank reactor is considered as the test case. Recently, Sinha et al. (1990) developed an adaptive control scheme for controlling nonlinear systems that exhibit complex periodic behavior. They use the difference between the actual

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Vibrational Control of Chemical Reactors: Stabilization and Conversion Improvement in an Exothermic CSTR

Cited by 11 publications

References 15 publications

Forced periodic control of an exothermic CSTR with multiple input oscillations

Forced periodic control of an exothermic CSTR with multiple input oscillations

References

Nonlinear predictive control of periodically forced chemical reactors

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