Gas Turbine Inlet Air Cooling

Current Situation

The design and development of gas turbine power plants has been progressing rapidly over the last ten years. Output and efficiency have increased substantially and significant research time has been spent on performance enhancement. Gasturbine outputs of greater than 240MW, and combined cycle efficiencies up to 60% have been achieved.
However, the power output and efficiency of gas turbines are strongly dependent on the ambient air conditions. An increase of the ambient air temperature decreases the power output rapidly.
In India, Altair has worked extensively with leading IPP's, State Electricity Boards & Central Utilities, including NTPC,etc where power output has been over 8% after retrofitting of these systems.

How Gas Turbine & Marine Equipment Works

  • Water is circulated through a pump station and supplied to the top of the cooling pad via a distribution manifold. A distribution pad ensures an even water distribution.
  • The water flows down the corrugated surface of the dampened evaporative cooling pad. Part of the water is evaporated by the warm and dry air that passes through the pad. The rest of the water assists in washing the pad, and is drained back to the pump station through a gutter system. The heat that is needed for the evaporation is taken from the air itself.
  • The air that leaves the pad is therefore cooled and humidified simultaneously without any external energy supply for the evaporation process. This is nature’s own cooling process.

Advantages of the GT Inlet Cooling System

  • Increased power output
  • Low investment and operation cost
  • Filtration ability
  • Noise control
  • High evaporation efficiency
  • Superb wetting properties
  • Low pressure drops when wet, leading to lower operating costs
  • No water carries over
  • Low scaling, Self-cleaning
  • Strong and self-supporting
  • Long life
  • Low running costs
  • Quick and easy to install
  • Environmentally friendly
  • Consistent high quality