Dynamical analysis and control synthesis of RO desalination process against water hammering

Phuc, Bui Duc Hong; You, Sam–Sang; Lim, Tae-Woo; Kim, Hwan–Seong

doi:10.1016/j.desal.2016.09.023

Cited by 16 publications

(13 citation statements)

References 12 publications

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“…Alterações sazonais, mensais ou diárias na alimentação das OR afetam consideravelmente a qualidade daágua, alterando a atuação dos módulos das membranas, levando-os a um desempenho sub-ótimo com a diminuição da produção deágua de produto e o aumento de danos permanentes ao sistema [7]. Dessa forma, técnicas de controle podem ser utilizadas para diminuir o efeito das alterações sazonais, fazendo que os parâmetros da planta se mantenham nas condições ideais de operação.…”

Section: Modelagem De Orunclassified

“…As equações diferenciais não-lineares que descrevem o comportamento dinâmico dos fluxos através das válvulas de concentração e de bypass, respectivamente, conforme [7], são:…”

Section: A Modelo Não-linearunclassified

“…Em [6], foi desenvolvido o modelo OR, a partir de simulações, para analisar e otimizar o mecanismo de redução e controle de encrustações. Em [7], foi implementado controlador robusto baseado no modelo apresentado em [3] em que foram considerados as incertezas, distúrbios e ruídos presentes no processo. Em [8], foram estudadas as membranas e construção do modelo de transporte a partir dos parâmetros nominais do processo.…”

Section: Introductionunclassified

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Controle de uma planta de dessalinização por osmose reversa acionada por sistema fotovoltáico e banco de baterias

Queiroz

Araújo

Nogueira

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

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Neste trabalho são apresentadas a modelagem e controle de um sistema de dessalinização por osmose reversa. As entradas do sistema são as válvulas de bypass e da água de concentrado. As saídas do sistema são o fluxo da água de produto e a pressão de entrada do sistema. O modelo não linear obtido é linearizado e para o ponto de operação considerado um controlador por alocação de pólos com ação integral é projetado. Resultados preliminares são promissores, com bons resultados para rastreamento de referência e rejeição de distúrbios.

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Section: Modelagem De Orunclassified

“…As equações diferenciais não-lineares que descrevem o comportamento dinâmico dos fluxos através das válvulas de concentração e de bypass, respectivamente, conforme [7], são:…”

Section: A Modelo Não-linearunclassified

Section: Introductionunclassified

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Controle de uma planta de dessalinização por osmose reversa acionada por sistema fotovoltáico e banco de baterias

Queiroz

Araújo

Nogueira

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

View full text Add to dashboard Cite

show abstract

“…Nevertheless, the effective control of these plants is not a simple assignment and has several challenges, among which are: (a) the dynamic processes in the membrane vessels are complex and cannot easily be modelled; (b) for the operation of the high-pressure pump, a large amount of energy is required; (c) the feed seawater features variations can considerably change the performance of the RO membrane units, which leads to lower water production, deficient system operations, membranes fouling or irreversible membranes damages; (d) the high-pressure setpoint has to be increased several times a day for compensation of the membranes fouling effect and to bring the permeate flowrate back to its operation value, which usually is done manually by plant operators; (e) continuous monitoring of membranes fouling is required to determine the appropriate time for membranes flushing (cleaning in place by chemical detergents is applied when membrane flushing is not sufficient to recover the good membranes performance); and (f) the operators of these plants are trained by conventional methods that only enable them to maneuver the infrastructures and not to control and manage these plants efficiently [30][31][32]. In addition, these plants have uncertainties, multivariable coupling, load disturbances, and dynamics dependent on the operation conditions, since a few of their parameters, such as the membrane permeability, are time-varying due to membranes fouling [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Implementation of an Expert Model Predictive Controller in a Pilot-Scale Reverse Osmosis Plant for Brackish and Seawater Desalination

et al. 2019

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This article addresses the design and real-time implementation of an expert model predictive controller (Expert MPC) for the control of the brackish and seawater desalination process in a pilot-scale reverse osmosis (RO) plant. This pilot-scale plant is used in order to obtain the optimal operation conditions of the RO desalination process through the implementation of different control strategies, as well as in the training of operators in the new control and management technologies. A dynamical mathematical model of this plant has been developed based on the available field data and system identification procedures. Predictions of the obtained model were in good agreement with the available field data. The designed Expert MPC is distinguished by having a plant identification block and an expert system. The expert system, using a rule-based approach and the evolution of the plant variables, can modify the plant identification block, the plant prediction model, and/or the optimizer in order to improve the performance, robustness and operational safety of the overall control system. The real-time comparison results of the designed Expert MPC and a well-designed model predictive controller (MPC) show that the proposed Expert MPC has a significantly better performance and, therefore, higher accuracy and robustness.

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“…3 Uninterrupted water supply is the ultimate aim in every design and operation of WDS. The significance of WH impacts is highlighted in the areas of desalination plant membrane, 4 pressurized water reactor loop pipes, 5 gas-oil or oil-water separation membrane WH, 6 and hydraulic power plant penstock failures. 7 Many literatures are over the risk of WH in WDS like burst.…”

Section: Introductionmentioning

confidence: 99%

Water hammer vibrations in pressurized water distribution system: Conceptual development of dynamic model and validation

Sankaranarayanan

Sivakumaran

Radhakrishnan

et al. 2019

Asia-Pacific J Chem Eng

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In this paper, the dynamical behavior of water hammer (WH) caused vibrations by valve failures, and the corresponding impact of the vibrations over the water distribution system (WDS) is discussed. The existing mathematical model of WH is represented by partial Differential Equation (PDE) format, which is not compatible with the WDS model represented through Ordinary Differential Equation (ODE). The existing PDE model does not account the rate of change of valve dynamics. Thus, to overcome the abovementioned intricacies, the PDE is converted to a set of ordinary differential equations, and the valve coefficient is incorporated in the model. The WDS that is considered in this context has storage tank in every consumer node too, with regulating valves at the terminal ends of the pipelines. Various modes of pipeline valve failures are created, and the corresponding effects propagating throughout the WDS are studied in control aspects. The corresponding mathematical model in each mode of operations are also obtained. The simulation studies show the uncertainties induced by WH that interrupts the nominal operation of the WDS. KEYWORDS analytical characterization of WH in WDS, capillary effect of water hammer in WDS, detection of nonminimum phase caused inherent WH disturbances in WDS, integrating valve dynamics in WH, WH modelling

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Dynamical analysis and control synthesis of RO desalination process against water hammering

Cited by 16 publications

References 12 publications

Controle de uma planta de dessalinização por osmose reversa acionada por sistema fotovoltáico e banco de baterias

Controle de uma planta de dessalinização por osmose reversa acionada por sistema fotovoltáico e banco de baterias

Real-Time Implementation of an Expert Model Predictive Controller in a Pilot-Scale Reverse Osmosis Plant for Brackish and Seawater Desalination

Water hammer vibrations in pressurized water distribution system: Conceptual development of dynamic model and validation

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