Simulation of a Forced Multiple Effect Brine Concentration Process

Document Type : Research Article

Authors

1 MSc. Student of Mechanical Engineering at Guilan University

2 Faculty of Mechanical Engineering, University of Guilan

Abstract

Brine Concentration is a comprehensive process and has an effective role in reducing environmental pollution due to desalination plant wastewater. In this study, the equations, for feed-forward forced convective falling film brine concentrators, with the desired number of effects and thermal vapor compression have been solved by MATLAB code. Thermodynamic modeling results of a two stage brine concentrator represented that 6.25 ton/hr feed with 90000 ppm concentration produces 5 ton/hr fresh water and 1.25 ton/hr wastewater with 450000 ppm concentration. The gained output ratio of plant is 2.63 and the specific heat transfer area is 74.3 m2s/kg. Also, by thermohydraulic modeling, to control the sediment rate with the limitations of allowable pressure drop and stream velocity in different tube lengths and diameters and evaporator number of passes, heat transfer area and the number of tubes have been calculated. Finally, the effects of design variables on gained output ratio and specific heat transfer area are investigated. The results represented that effects number, feed, and driving steam temperature are the three most important variables since increasing the effects number causes a 17% increase in gained output ratio and 23.5% increase in the specific heat transfer area. Increasing 1 ֯C in feed and motive vapor temperature lead to a 2.5% increase and 3% decrease in the specific heat transfer area. But these two don’t have any effect on gained output ratio.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 54, Issue 3
June 2022
Pages 509-530

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