Desalination of seawater by spray freezing in a natural draft tower

Yang Liu, Tingzhen Ming, Yongjia Wu, Renaud Richter, Yueping Fang, Nan Zhou

Research output: Contribution to journalArticlepeer-review

Abstract

The freeze-melting process can be aviable methodfor thepurposes of desalination because of its low energy consumption, ignorable corrosion issues, and without huge pressure or membrane replacement work. Large contactareaforheatandmasstransferperunitmassofwaterbetweenthewaterandairandlowheatresistance results in higher energy efficiency during spray freezing desalination process compared to other freezing desalinationmethods.A200mhighdesalinationtowerwasproposedinthispaperthatcouldgenerate27.7kg/s freshwaterintheformofwaterdropletswith2mmdiameteratanatmospherictemperatureof−26°C.This researchhasfoundedthatthenaturalconvectiveairflowinducedbytheheatreleasedbythewarmwaterinthe freezingprocesscouldgeneratethroughthewindturbinemountedinthissystemapproximatelyone-thirdofthe energyconsumedbythewaterpumpofthesystem.Thisfreeenergyhasneverbeenstudiedinpreviousresearch. The power consumption required to produce 1 m3 fresh water in this system is approximately 1.07 kWh. Comparedtotraditionaldesalinationmethods,thepowerconsumptionofournewsprayfreezingdesalination system ismuchlowerthanprevioussystemswiththesame massflowrateoffreshwater.Only375.4kJcold energytoproduceone-kilogramfreshwater.Thus,thissprayfreezingdesalinationsystemcouldbeemployedin desalinationindustryiffreecoldenergy(e.g.fromthecoldatmosphereortheregasificationprocessofLNG)and seawaterresourcesareavailable.
Original languageEnglish
Article number114700
Pages (from-to)(In-Press)
Number of pages13
JournalDesalination
Volume496
Issue number1
Early online date15 Sep 2020
DOIs
Publication statusPublished - 15 Dec 2020

Keywords

  • Compressible airflow
  • Natural draft tower
  • Seawater desalination
  • Spray freezing
  • Water droplet

ASJC Scopus subject areas

  • Energy(all)

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