Method for desalination of water and removal of carbon dioxide from exhaust gases

摘要

This invention relates to a method for desalination of seawater ( 5, 30 ) and separation of CO₂ from exhaust ( 77 ) from a gas turbine ( 7 ). LNG ( 4 ) is fed into a heat exchanger ( 6 ) in which it receives heat from seawater ( 5 ) and heat from steam ( 27 ) from an exhaust boiler, and heat from combustion air ( 3 ) via a line to an air inlet ( 33 ) of said gas turbine ( 7 ), for evaporating LNG ( 4 ) to gas which is fed to a gas export module ( 10 ) and to a fuel gas skid ( 8 ) for supplying said gas turbine ( 7 ) with fuel. Thus said combustion air ( 3, 28 ) at the air inlet to said gas turbine ( 7 ) obtains a lowered temperature and increases an efficiency of said gas turbine ( 7 ). Said CO₂-rich exhaust gas ( 77 ) from said gas turbine ( 7 ) is fed into a process unit ( 17 ) having an inlet ( 35 a) with a fan ( 35 b) and an outlet for CO₂-reduced exhaust ( 13 ). Said cooled seawater from said heat exchanger ( 6 ) is fed into said process unit ( 17 ) via a coaxial feed pipe ( 67 ) for seawater and NH₄OH arranged in said process unit ( 17 ). NH₄OH is fed into said coaxial feed pipe ( 67 ) and is then mixed with said cooled seawater ( 30 ) and released via a series of nozzles in several vertical levels from said feed pipe ( 67 ) to said process unit's ( 17 ) upwards flowing, rotating exhaust ( 77 ). By this device a good mixture of NH₄OH-containing salt water and CO₂-rich exhaust is achieved, for formation of NaHCO₃, NH₄Cl, and fresh water.