THERMODYNAMIC STUDY OF ADVANCED GAS TURBINE COOLING SYSTEM

This paper is based on an assessment of the comparison between two separate air intake cooling strategies (evaporative-cooling and vapour-compression cooling) are combined in a cooled gas turbine power station. A parametric analysis of the influence of the pressure ratio, the compressor inlet temperature and the turbine inlet temperature on the plant output variables was performed. The incorporation of the inlet air cooling system into the gas turbine cycle has been applied to improve overall performance, with greater improvement at higher ambient temperatures. As atmospheric temperatures increase from 293K to 320K, the gross specific work output decreases by 4.7 % and the thermal performance decreases by 22 %. With an improvement in TIT, gas turbine efficiency is improving. As TIT increases from 1450 K to 1900 K at CPR 21, net real work output is increased by 59 %, thermal efficiency increases by 4.8 %, the adoption of higher turbine inlet temperature have a more pronounced effect on vapour compression cooled gas turbine compared to evaporative cooling, in terms of improvement in plant efficiency parameters. Using EES software, a simulation is also carried out to find out the various parameters, i.e. the basic performance work of the turbine, compressor inlet work, cooling load, and compare these results with the various cooling systems.