Impacts of tube bundle arrangement and feed flow pattern on the scale formation in large capacity MED desalination plants

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7 Citations (Scopus)

Abstract

The aim of the present work is to evaluate the effect of tube bundle arrangement and the seawater feed distribution on the dry zone and scale formation in the large sized Multiple Effect Distillation (MED) evaporator.A mathematical model of the seawater feed distribution is developed and validated for a triangular pitch tube bundle of MED evaporator. The developed model includes CaCO3 scale formation and CO2 release. The simulation results showed that the dripping seawater flow rate on the column based on the 2nd row is lower than that of the 1st row. Consequently, the wetting rate of the tubes in the column based on the 2nd row is less than that based on the 1st row. This explains why the tubes based on the 2nd row experience more CaCO3 scale deposit than that based on the 1st row.The simulation results showed that increasing the feed seawater to twice that of the original flow will reduce the scale thickness by 15%. Increasing the tube pitch by twice the diameter will reduce the scale thickness by 30%. The combined effect of modified feed flow and increase in the tube pitch would significantly reduce the scale precipitation thickness.

Original languageEnglish
Pages (from-to)275-285
Number of pages11
JournalDesalination
Volume357
DOIs
Publication statusPublished - 2 Feb 2015

Fingerprint

Desalination
distillation
Seawater
Distillation
flow pattern
Flow patterns
seawater
Evaporators
wetting
simulation
Wetting
Deposits
Flow rate
Mathematical models
desalination plant
effect
distribution
rate

Keywords

  • CO release
  • Desalination
  • Feed distribution
  • MED
  • Pitch
  • Scale formation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Chemistry(all)
  • Materials Science(all)
  • Water Science and Technology

Cite this

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title = "Impacts of tube bundle arrangement and feed flow pattern on the scale formation in large capacity MED desalination plants",
abstract = "The aim of the present work is to evaluate the effect of tube bundle arrangement and the seawater feed distribution on the dry zone and scale formation in the large sized Multiple Effect Distillation (MED) evaporator.A mathematical model of the seawater feed distribution is developed and validated for a triangular pitch tube bundle of MED evaporator. The developed model includes CaCO3 scale formation and CO2 release. The simulation results showed that the dripping seawater flow rate on the column based on the 2nd row is lower than that of the 1st row. Consequently, the wetting rate of the tubes in the column based on the 2nd row is less than that based on the 1st row. This explains why the tubes based on the 2nd row experience more CaCO3 scale deposit than that based on the 1st row.The simulation results showed that increasing the feed seawater to twice that of the original flow will reduce the scale thickness by 15{\%}. Increasing the tube pitch by twice the diameter will reduce the scale thickness by 30{\%}. The combined effect of modified feed flow and increase in the tube pitch would significantly reduce the scale precipitation thickness.",
keywords = "CO release, Desalination, Feed distribution, MED, Pitch, Scale formation",
author = "Abdelnasser Aboukhlewa and K. Bourouni and Abdulrahim, {H. K.} and M. Darwish and Sharif, {A. O.}",
year = "2015",
month = "2",
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doi = "10.1016/j.desal.2014.11.028",
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journal = "Desalination",
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TY - JOUR

T1 - Impacts of tube bundle arrangement and feed flow pattern on the scale formation in large capacity MED desalination plants

AU - Aboukhlewa, Abdelnasser

AU - Bourouni, K.

AU - Abdulrahim, H. K.

AU - Darwish, M.

AU - Sharif, A. O.

PY - 2015/2/2

Y1 - 2015/2/2

N2 - The aim of the present work is to evaluate the effect of tube bundle arrangement and the seawater feed distribution on the dry zone and scale formation in the large sized Multiple Effect Distillation (MED) evaporator.A mathematical model of the seawater feed distribution is developed and validated for a triangular pitch tube bundle of MED evaporator. The developed model includes CaCO3 scale formation and CO2 release. The simulation results showed that the dripping seawater flow rate on the column based on the 2nd row is lower than that of the 1st row. Consequently, the wetting rate of the tubes in the column based on the 2nd row is less than that based on the 1st row. This explains why the tubes based on the 2nd row experience more CaCO3 scale deposit than that based on the 1st row.The simulation results showed that increasing the feed seawater to twice that of the original flow will reduce the scale thickness by 15%. Increasing the tube pitch by twice the diameter will reduce the scale thickness by 30%. The combined effect of modified feed flow and increase in the tube pitch would significantly reduce the scale precipitation thickness.

AB - The aim of the present work is to evaluate the effect of tube bundle arrangement and the seawater feed distribution on the dry zone and scale formation in the large sized Multiple Effect Distillation (MED) evaporator.A mathematical model of the seawater feed distribution is developed and validated for a triangular pitch tube bundle of MED evaporator. The developed model includes CaCO3 scale formation and CO2 release. The simulation results showed that the dripping seawater flow rate on the column based on the 2nd row is lower than that of the 1st row. Consequently, the wetting rate of the tubes in the column based on the 2nd row is less than that based on the 1st row. This explains why the tubes based on the 2nd row experience more CaCO3 scale deposit than that based on the 1st row.The simulation results showed that increasing the feed seawater to twice that of the original flow will reduce the scale thickness by 15%. Increasing the tube pitch by twice the diameter will reduce the scale thickness by 30%. The combined effect of modified feed flow and increase in the tube pitch would significantly reduce the scale precipitation thickness.

KW - CO release

KW - Desalination

KW - Feed distribution

KW - MED

KW - Pitch

KW - Scale formation

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