Performance simulation of a multi-VMD desalination process including the recycle flow

S. M. Shim, J. G. Lee, Woo-Seung Kim

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

In this paper, a performance evaluation of a multi-vacuum membrane distillation (VMD) module was conducted using a one-dimensional model. The mathematical model consisted of momentum, mass and energy balance equation using the water permeate flux model and heat flux model. The simulation results were in good agreement with the experimental results from previous literature. The validated VMD model was implemented into Aspen Plus. Then, a multi-VMD module with one-through flow was simulated. As a result, in the high velocity region, the hydraulic pressure was used as the constraint to determine the number of membrane modules. In the low velocity region, the number of membrane module was determined based on the feed temperature. To improve water recovery and thermal efficiency of the multi-VMD module, the recycle flow was considered and the waste heat included in the discharge brine was recovered. As a result, it was possible to achieve water recovery over 40%. In addition, as the recycle flow ratio increased, thermal efficiency also improved since heat duty and thermal consumption per unit water production decreased.

Original languageEnglish
Pages (from-to)39-48
Number of pages10
JournalDesalination
Volume338
Issue number1
DOIs
StatePublished - 2014 Apr 1

Fingerprint

Desalination
distillation
Distillation
desalination
Vacuum
membrane
Membranes
simulation
Water
Recovery
water
Waste heat
Energy balance
energy balance
brine
heat flux
Heat flux
mass balance
momentum
Momentum

Keywords

  • Distillation
  • Hollow fiber
  • Membrane
  • Modeling
  • Seawater desalination

Cite this

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abstract = "In this paper, a performance evaluation of a multi-vacuum membrane distillation (VMD) module was conducted using a one-dimensional model. The mathematical model consisted of momentum, mass and energy balance equation using the water permeate flux model and heat flux model. The simulation results were in good agreement with the experimental results from previous literature. The validated VMD model was implemented into Aspen Plus. Then, a multi-VMD module with one-through flow was simulated. As a result, in the high velocity region, the hydraulic pressure was used as the constraint to determine the number of membrane modules. In the low velocity region, the number of membrane module was determined based on the feed temperature. To improve water recovery and thermal efficiency of the multi-VMD module, the recycle flow was considered and the waste heat included in the discharge brine was recovered. As a result, it was possible to achieve water recovery over 40{\%}. In addition, as the recycle flow ratio increased, thermal efficiency also improved since heat duty and thermal consumption per unit water production decreased.",
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Performance simulation of a multi-VMD desalination process including the recycle flow. / Shim, S. M.; Lee, J. G.; Kim, Woo-Seung.

In: Desalination, Vol. 338, No. 1, 01.04.2014, p. 39-48.

Research output: Contribution to journalArticle

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AU - Kim, Woo-Seung

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AB - In this paper, a performance evaluation of a multi-vacuum membrane distillation (VMD) module was conducted using a one-dimensional model. The mathematical model consisted of momentum, mass and energy balance equation using the water permeate flux model and heat flux model. The simulation results were in good agreement with the experimental results from previous literature. The validated VMD model was implemented into Aspen Plus. Then, a multi-VMD module with one-through flow was simulated. As a result, in the high velocity region, the hydraulic pressure was used as the constraint to determine the number of membrane modules. In the low velocity region, the number of membrane module was determined based on the feed temperature. To improve water recovery and thermal efficiency of the multi-VMD module, the recycle flow was considered and the waste heat included in the discharge brine was recovered. As a result, it was possible to achieve water recovery over 40%. In addition, as the recycle flow ratio increased, thermal efficiency also improved since heat duty and thermal consumption per unit water production decreased.

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