Abstract:
During the last years, gas turbines have been widely used to produce
electricity power. Gas turbine power plants mainly met the increase on load at
peaking load. However, gas turbine power plants have the disadvantages of
decreases in maximum power output in the summer daytime, which reduces the
availability of gas turbines. One of the ways to avoid aforementioned
disadvantage is making by cool inlet air of the gas turbine to increase the density,
improve the gas turbine performance and augment maximum power output. In
addition, one of the ways for cooling the inlet air is to make ice by driving
electric compression refrigerators using during off-peak load. Store it in ice
storage tank and use it for cooling the inlet air during the on-peak period.
Thermal energy storage for combustion turbine inlet air cooling offers an
economical solution when short duration capacity enhancements are required.
The objectives of this research is to investigate the effect of inlet air
cooled by ice storage in Garri power plant station, expected results of the thermal
energy storage for combustion turbine inlet air cooling system are included and
economical profits.
A computer based calculation procedure using Excel worksheet was built,
and applied to estimate the effect of the system on Garri power plant station. The
calculation based on the plant data which is the combustion turbine model
Alstom-GE PG-6551B, ambient air design is 35.7 DB/ 30% RH, and enthalpy
64.04 kJ/kg, inlet air design 15 DB/ 100% RH, and enthalpy 42.01 kJ/kg, air
mass flow 518300 kg/hr @ 15, and peak cooling hour is 4 hours/day, 5
days/week. The results for the designing calculations were 20.6% increased in
power generation or 6.1MW increased in capacity and 5.2% increased in
efficiency. The project installation cost about 4103599 SDG and 2.1 years
payback period of the system.
