Dry Cooling Units for Power Plant Based on Gas Turbine Unit

Dry Cooling Units for Power Plant Based on Gas Turbine Unit

Dry cooling units (DCUs) play a critical role in gas turbine-based power plants, especially in water-scarce regions, by replacing traditional water-based cooling systems (wet cooling) with air as the primary heat sink. These systems are designed to dissipate excess heat from the power cycle—typically from the gas turbine’s exhaust, waste heat recovery boiler (WHRB), or steam turbine condenser—while minimizing water consumption.

Gas turbine power plants (often configured as combined cycle gas turbine, CCGT, plants) generate electricity through two main stages:

Gas turbine cycle: Fuel (natural gas, etc.) burns in the gas turbine, driving a generator to produce electricity. High-temperature exhaust (≈500–600°C) is emitted.

Steam cycle: Exhaust heat is captured by a WHRB to produce steam, which drives a steam turbine (and another generator) for additional power (improving efficiency from ~35% to ~60% in CCGT).

After passing through the steam turbine, the low-pressure steam must be condensed back into water to complete the cycle. Dry cooling units handle this condensation (or other heat rejection needs) using ambient air instead of water, eliminating the need for large cooling towers or water-intensive systems.