CFD analysis of the tube bundle orientation impact on the thermal losses and vapor uniformity within the MED desalination plant

Research output: Contribution to journalArticle

Abstract

Thermal desalination still considered as a reliable technology, where the seawater characteristic is challenging in terms of high salinity, elevated temperature and high impurity level especially in the Gulf seawater case. Multi-effect distillation (MED) is an efficient thermal process for the commercial and large-scale desalination plants. Even though, minimization of the thermal losses within the evaporator is a matter of interest to improve the MED process. This work presents a computational fluid dynamic (CFD) simulation of vapor route for two conventional MED configurations named as long tube (MED-LT) and cross tube (MED-CT), respectively. The thermal losses and vapor uniformity are calculated at several vapor box lengths and process recovery ratios. An MED evaporator of 25 m 3 /d is considered for the CFD computational domain and conducted by COMSOL multiphysics. The CFD results show that compared by MED-LT configuration, the MED-CT configuration creates less uniform vapor flow at the tube sheet which indicates that some tubes will be admitted by amount of vapor higher than the designed, and accordingly will become overheated and lead to the scale deposition on the tube surface. The tube bundle losses represent 90% of the total losses while the rest is encountered in the demister and vapor box. This indicates that minimizing the thermal losses in the tube bundle is more effective and recommended for future work. The footprint of the MED-LT configuration is 25% lower than that the MED-CT configuration. It can be concluded that the MED-LT configuration is superior in terms of better vapor uniformity for reliable operation and lower foot print.

Original languageEnglish
Pages (from-to)165-177
Number of pages13
JournalDesalination and Water Treatment
Volume143
DOIs
Publication statusPublished - 1 Mar 2019

Fingerprint

dynamic analysis
Desalination
computational fluid dynamics
distillation
Distillation
Dynamic analysis
Computational fluid dynamics
Vapors
Evaporators
Seawater
footprint
Hot Temperature
loss
effect
desalination plant
seawater
desalination
Impurities
salinity
Recovery

Keywords

  • CFD
  • Desalination
  • MED
  • Thermal losses
  • Vapor box
  • Vapor route

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Pollution

Cite this

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title = "CFD analysis of the tube bundle orientation impact on the thermal losses and vapor uniformity within the MED desalination plant",
abstract = "Thermal desalination still considered as a reliable technology, where the seawater characteristic is challenging in terms of high salinity, elevated temperature and high impurity level especially in the Gulf seawater case. Multi-effect distillation (MED) is an efficient thermal process for the commercial and large-scale desalination plants. Even though, minimization of the thermal losses within the evaporator is a matter of interest to improve the MED process. This work presents a computational fluid dynamic (CFD) simulation of vapor route for two conventional MED configurations named as long tube (MED-LT) and cross tube (MED-CT), respectively. The thermal losses and vapor uniformity are calculated at several vapor box lengths and process recovery ratios. An MED evaporator of 25 m 3 /d is considered for the CFD computational domain and conducted by COMSOL multiphysics. The CFD results show that compared by MED-LT configuration, the MED-CT configuration creates less uniform vapor flow at the tube sheet which indicates that some tubes will be admitted by amount of vapor higher than the designed, and accordingly will become overheated and lead to the scale deposition on the tube surface. The tube bundle losses represent 90{\%} of the total losses while the rest is encountered in the demister and vapor box. This indicates that minimizing the thermal losses in the tube bundle is more effective and recommended for future work. The footprint of the MED-LT configuration is 25{\%} lower than that the MED-CT configuration. It can be concluded that the MED-LT configuration is superior in terms of better vapor uniformity for reliable operation and lower foot print.",
keywords = "CFD, Desalination, MED, Thermal losses, Vapor box, Vapor route",
author = "Abdelnasser Aboukhlewa and Ahmed Abotaleb",
year = "2019",
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AU - Aboukhlewa, Abdelnasser

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N2 - Thermal desalination still considered as a reliable technology, where the seawater characteristic is challenging in terms of high salinity, elevated temperature and high impurity level especially in the Gulf seawater case. Multi-effect distillation (MED) is an efficient thermal process for the commercial and large-scale desalination plants. Even though, minimization of the thermal losses within the evaporator is a matter of interest to improve the MED process. This work presents a computational fluid dynamic (CFD) simulation of vapor route for two conventional MED configurations named as long tube (MED-LT) and cross tube (MED-CT), respectively. The thermal losses and vapor uniformity are calculated at several vapor box lengths and process recovery ratios. An MED evaporator of 25 m 3 /d is considered for the CFD computational domain and conducted by COMSOL multiphysics. The CFD results show that compared by MED-LT configuration, the MED-CT configuration creates less uniform vapor flow at the tube sheet which indicates that some tubes will be admitted by amount of vapor higher than the designed, and accordingly will become overheated and lead to the scale deposition on the tube surface. The tube bundle losses represent 90% of the total losses while the rest is encountered in the demister and vapor box. This indicates that minimizing the thermal losses in the tube bundle is more effective and recommended for future work. The footprint of the MED-LT configuration is 25% lower than that the MED-CT configuration. It can be concluded that the MED-LT configuration is superior in terms of better vapor uniformity for reliable operation and lower foot print.

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