Abstract
This article presents the approximate solution of non-linear dynamic energy model of multiple effect evaporator (MEE) using Fourier series and metaheuristics. The dynamic model of MEE involves first-order simultaneous ordinary differential equations (SODEs). Prior to solving the dynamic model, the non-linear steady-state model is solved to obtain the optimum steady-state process parameters. These process parameters serve as the initial conditions (constraints) for the SODEs. The SODEs are exemplified as an optimization problem by the weighted residual function to produce their approximate solutions. The optimization task is to find the best estimates of unknown coefficients in the Fourier series expansion using two preeminent metaheuristic approaches: Particle swarm optimization and harmony search. Besides, the influence of the number of approximation terms in Fourier series expansion on the accuracy of the approximate solutions has been investigated. The solution of the dynamic model assists in the investigation of open-loop dynamics of the MEE. Moreover, the acquired results may assist in designing suitable controllers to ensure energy-efficient performance of MEE and to monitor the product quality. The optimization results reveal that both the metaheuristic approaches offer minimum violation of the constraints and, therefore, validate their efficiency in solving such complex non-linear energy models.
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Abbreviations
- A:
-
effective heat transfer area [m2]
- BFFC:
-
backward feed flow configuration
- BL:
-
black liquor
- f:
-
feed
- hL or h:
-
enthalpy of black liquor [kJ/kg]
- H:
-
enthalpy of vapor [kJ/kg]
- HEE:
-
heptads’ effect evaporator
- HS:
-
harmony search
- i:
-
effect number
- J:
-
objective function for steady-state model solution
- L:
-
liquor flow rate [kg/s]
- MEE:
-
multiple effect evaporator
- N:
-
no. of effects in the evaporator system
- NT:
-
no. of approximation terms in Fourier series expansion
- ODE:
-
ordinary differential equation
- PF:
-
penalty function
- PSO:
-
particle swarm optimization
- R:
-
residual function
- SC:
-
steam consumption [kg/s]
- SE:
-
steam economy
- SNLAEs:
-
simultaneous non-linear algebraic equations
- SODEs:
-
simultaneous ordinary differential equations
- T:
-
temperature of vapor produced [°C]
- U:
-
overall heat transfer coefficient [kW/m2°C]
- V:
-
vapor flow rate [kg/s]
- W:
-
weight function
- WRF:
-
weighted residual function
- x:
-
liquor concentration
- z :
-
decision variables
- λ :
-
latent heat of vaporization [kJ/kg]
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Acknowledgements
The first and second author would like to thank the Ministry of Human Resource Development, New Delhi, India for providing the Research Fellowship for carrying out this work. The first author gratefully acknowledges her family without whose help and support this work would ever have been possible.
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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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Yadav, D., Kumar, S., Verma, O.P. et al. Approximate solution of non-linear dynamic energy model for multiple effect evaporator using fourier series and metaheuristics. Korean J. Chem. Eng. 38, 906–923 (2021). https://doi.org/10.1007/s11814-021-0787-3
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DOI: https://doi.org/10.1007/s11814-021-0787-3