LNG Convergence low-energy freeze desalination system using LNG waste heat and Convergence low-energy freeze desalination method using the same

摘要

The present invention relates to a system and a method for desalination of a low-energy frozen sea water using an LNG waste heat for desalinizing seawater by using waste heat of a liquefied natural gas (LNG) Separator; A vaporizer through which liquefied natural gas (LNG) passes, a seawater treated in the seawater flows in and a temperature of seawater treated in the seawater through heat exchange with the liquefied natural gas passing through the seawater; Wherein the liquefied natural gas is firstly passed through the evaporator, the seawater having a lowered temperature is introduced into the evaporator, and the seawater is heat-exchanged with the liquefied natural gas passing first, thereby separating the seawater into frozen fresh water and concentrated salt water. A washing tub for washing the iced fresh water; And a melting unit for melting and discharging the cleaned fresh water, and a melting unit for melting and discharging the cleaned fresh water, and a melting unit for melting and discharging the cleaned fresh water, wherein the heat exchange is performed using waste heat of the liquefied natural gas, It is possible to prevent the refrigerant from being contained in the finally discharged fresh water and to make the facility compact, to pre-treat the incoming seawater, and to clean the fresh fresh water to obtain better quality fresh water .