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Technology

Gas turbine suction air cooling system

The power output of a gas turbine decreases when the suction air temperature of an auxiliary combustion air compressor increases, and the flow rate of air decreases. Therefore, gas turbine cannot be maintained the rated power in the summer. The power of a combined power plant or a gas turbine power plant can be increased substantially compared with conventional systems with a system that cools the suction air with heat recovery from LNG in the summer.
In this system, water used as an LNG vaporization heat source in an LNG vaporizer (open rack vaporizer) is circulated in a loop to serve as a cold source for an suction air cooler, so only electric power for a water-circulation pump is necessary to cover the electric power required for the suction air cooling system.
The suction air temperature can be reduced by about 5 to 10°C with the use of heat recovery from LNG.

Flow of the Gas Turbine Inlet Cooling System Using LNG Cold Energy

  1. Heat recovery from LNG vaporization system is used for gas turbine suction air cooling.
  2. Power required for this heat recovery from LNG for suction air cooling is quite lower than other system using refrigeration. Therefore this is energy-saving system.
  3. The system can be operated from the spring to the fall, so the power output of gas turbines can be increased by several percent during this period.