Exhaust gas recirculation type combined plant

An exhaust gas recirculation type gas turbine apparatus comprising:

• a compressor for compressing air;
• a combustion chamber for burning compression air exhausted from said compressor and fuel;
• a gas turbine driven by gas turbine exhaust gas from said combustion chamber;
• a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;
• a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine;
• and
• a spray unit for spraying liquid droplets over air supplied to said compressor and gas turbine exhaust gas passing through said recirculation path so as to introduce the liquid droplets into the compressor in which said air and said gas turbine exhaust gas flow so that said introduced liquid droplets are vaporized during flow in said compressor;
• and
• wherein said recirculation amount control unit increases the amount of gas turbine exhaust gas to be returned to the intake of said compressor as compared with a case in which the liquid droplets are not introduced into the interior of said compressor.

An exhaust gas recirculation type gas turbine apparatus comprising;

• a compressor for compressing air;
• a combustion chamber for burning compression air exhausted from said compressor and fuel;
• a gas turbine driven by gas turbine exhaust gas form said combustion chamber;
• a recirculation path for recirculating a part of said gas turbine exhaust gas to an intake of said compressor;
• a recirculation amount control unit for adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in load of said gas turbine;
• and
• a spray unit for spraying liquid droplets having an average diameter of 30 μm or below so as to introduce the liquid droplets into the compressor in which mixing gas, comprising gas turbine exhaust gas passing through said recirculation path and air, flows, and said spray unit being disposed at the upstream of said compressor;
• and
• wherein said recirculation amount control unit increases the amount of gas turbine exhaust gas to be returned to the intake of said compressor as compared with a case in which the liquid droplets are not introduced into the interior of said compressor.

An operation method of an exhaust gas recirculation type gas turbine apparatus comprising the steps of;

• compressing air in a compressor;
• burning the compressed air and fuel in a combustion chamber;
• driving a gas turbine with gas turbine exhaust gas from said combustion chamber;
• recirculating a part of said gas turbine exhaust gas to an intake of said compressor through a recirculation path;
• adjusting an amount of gas turbine exhaust gas to be returned to the intake of said compressor corresponding to a change in the load of said gas turbine;
• and
• introducing liquid droplets into the compressor in which mixing gas, comprising gas turbine exhaust gas passing through said recirculation path and air, flows by spraying the liquid droplets from a spray unit so that the introduced liquid droplets are vaporized during a flow in said compressor;
• and
• wherein said recirculation amount control unit increases the amount of gas turbine exhaust gas to be returned to the intake of said compressor as compared with a case in which the liquid droplets are not introduced into the interior of said compressor.