Application of the ultrasonic technique for real-time holdup monitoring for the control of extraction columns

Tsouris, Costas; Tavlarides, Lawrence L.; Bonnet, Julio C.

doi:10.1016/0009-2509(90)80052-g

Cited by 18 publications

(9 citation statements)

References 13 publications

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“…Symbols β and γ denote volume thermal expansivity and the ratio of the specific heat capacities, respectively. Tavlarides and co-workers [32][33][34][35][36] conducted a series of experiments concerned with ultrasonic characterization of mixtures as well as the theoretical analysis and modelling of the scattering processes. In their earliest paper [32], they concluded that the time-average model of ultrasonic transmission fitted best their experimental results:…”

Section: Ultrasonic Measurements Of Heterogeneous Mixturesmentioning

confidence: 99%

Design and testing of a thick-film dual-modality sensor for composition measurements in heterogeneous mixtures

Meng

Jaworski

Dyakowski

et al. 2005

Meas. Sci. Technol.

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The current paper focuses on design and laboratory evaluation of a dual-modality sensor, developed for the needs of oil and gas extraction industry to measure the composition of heterogeneous mixtures in harsh conditions. The sensor combines ultrasonic and electrical measurement techniques, which are non-destructive, rapid and can potentially provide an on-line industrial measurement. Such a 'dual-modality' measurement could potentially be reliable in a wider range of process conditions. A distinct feature of the sensors presented here is their construction, which makes use of the thick-film technology, enabling the construction of multi-layered structures of both conductive and non-conductive layers, some of which may exhibit piezoelectric properties for ultrasonic measurement purposes. These are later fired on a ceramic substrate to provide rugged sensors, capable of working in aggressive industrial environments. Laboratory experiments to investigate the feasibility of the dual-modality sensors were conducted and some comparisons with the theoretical predictions are presented.

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Section: Ultrasonic Measurements Of Heterogeneous Mixturesmentioning

confidence: 99%

Design and testing of a thick-film dual-modality sensor for composition measurements in heterogeneous mixtures

Meng

Jaworski

Dyakowski

et al. 2005

Meas. Sci. Technol.

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“…where tl, t2 and t* are the travel times in the pure phases and the dispersion, respectively and E would be the holdup of phase 2. Tsouris et al (1990) have used this method for real-time holdup monitoring in control of extraction columns.…”

Section: Line Average Measurements Based On Radiation Techniquesmentioning

confidence: 99%

Measurement techniques for local and global fluid dynamic quantities in two and three phase systems

Kumar

Duduković

Toseland

1998

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“…The system may be described by the pair of equations (Tsouris and Tavlarides, 1990;Hufhagel et aI, 1991):…”

Section: Modellingmentioning

confidence: 99%

Constrained predictive control of a counter-current extractor

Mulholland

Narotam

1996

System Modelling and Optimization

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Continuous counter-current liquid-liquid extraction of copper from an acidic aqueous solution is performed in a 6m pulsed packed column. Bubbles of an immiscible organic phase, containing the complexing agent LIX 64N, move upward as the continuous aqueous phase moves downward. It is desired to regulate the residual copper content of the departing aqueous phase, using as control actions the organic feed rate and the pulse frequency. In this distributed system, profiles of copper concentration become imprinted on the descending aqueous phase as a result of the history of controls and disturbances acting during the passage of a parcel. Initial work has involved the development of a dynamic model of the extractor, and the proving of a constrained model predictive controller on this model. The model is based on a spectral solution along the discretised column length, with special treatments of convection and the boundary conditions. The Linear Dynamic Matrix Controller (LDMC) minimises the summed magnitudes of deviation from setpoint, over a time horizon of up to 50 steps. The algorithm used is based on the method of Chang and Seborg (1983).

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Application of the ultrasonic technique for real-time holdup monitoring for the control of extraction columns

Cited by 18 publications

References 13 publications

Design and testing of a thick-film dual-modality sensor for composition measurements in heterogeneous mixtures

Design and testing of a thick-film dual-modality sensor for composition measurements in heterogeneous mixtures

Measurement techniques for local and global fluid dynamic quantities in two and three phase systems

Constrained predictive control of a counter-current extractor

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