Gas Turbine Handbook : Principles and Practices

254 Gas Turbine Handbook: Principles and Practices
a gas-liquid separator. Finally, the combustion fuel gas is brought to
a pressure of 330 psia by a high pressure compressor. The fuel gas is
fed to the two gas turbines at a temperature of 203°F and pressure of
300 psia. Operating parameters of the cogeneration plant are shown
in Figure 15-3.
Figure 15-3. Corinth Motor Oil Company.
Corinth, Greece
GT35 Operating Parameters
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Gas Turbine Units
2 × GT35, ABB STAL
Initial Unit Output 11.5 MW @ 95°F
Up-Graded Unit Output 13.5 MW @ 95°F
Fuels
Refinery Flare Gas/LPG
HRSG
1 × Supplementary
High Pres. Steam
52 tons/hr @ 683 psig/788°F
Low Pres. Steam
16 tons/hr @ 36 psig/280°F
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The Corinth Cogeneration Plant contributes to the refinery
profitability. First, it utilizes its by-product (cost-free) flare gases as
the primary combustion fuel for the gas turbines. By having its own
cogeneration system, it dramatically improves the refinery profit profile
by eliminating the costly refinery downtime due to power outages
from the local power grid. The cogen plant also eliminates the everpresent
threat of electrical rate hikes. Lastly, the cogeneration plant
has reduced NO x
emissions to an air quality well below the acceptable
limits imposed by the Authority. The cogen plant’s noise emission is
52 dBA at 400 feet. The cogen plant is viewed positively by the Greek
Authority in the battle against pollution.
The Corinth cogen plant has met all the objectives set by the
Refinery. The utilization of the refinery flare gas has resulted in an
accelerated payback period for this cogen plant of 2.6 years. According
to the Motor Oil Company, the net savings from the cogen plant for
1992 were US $8,000,000. Profitability is shown in Figure 15-4.
Hellenic Aspropyrgos Refinery
The Hellenic Refinery is located in Aspropyrgos, Greece. It was
installed in 1958, with an initial through-put of 8,500,000 tons per