Azura-Edo Independent Power Plant Environmental Impact ... - IFC

Gas Turbine Building
The four gas turbines will be arranged in a line within the gas turbine
building. A turbine crane will run the length of the building, with main access
doors for maintenance from each end of the gas turbine building. An access
corridor will run through the building along one side of the gas turbine units
and a low level electrical annex will be situated close to the transformer and
below the level of the gas turbine air intake filter housings.
The electrical annex will house the switchgear, control cubicles and cabling for
the gas turbine units and their auxiliaries. Diverter or damper units with
bypass stacks will be included in each gas turbine exhaust to allow for future
conversion to a CCGT plant. The gas turbines will be installed in a noise
reducing enclosure to keep the noise levels from the gas turbines below 85
dBA.
Gas Turbines
The initial design assumes a General Electric Frame 9E machine, but the
chosen gas turbine may be a different E class gas turbine from an alternative
manufacturer. It is estimated that the year of manufacture will be 2012 or later
and that the Warranty will be for at least two years. These turbines have the
following characteristics:
• Maximum turbine capacity of 112.5 MW (140.625 MVA) and minimum
turbine capacity of 67.5 MW (minimum turndown of 60 percent).
• New and clean Heat Rate of 11,100 Btu/kWh (lower heating value) at the
Project site conditions; new and clean efficiency of 32 percent.
• The gas turbines will be fuelled by natural gas.
• The gas turbine pressure ratio will be 12.6:1.
• The gas turbines will be built in a noise reducing enclosure. The target
noise outside of the enclosure will be less than 85 dBA (see Section 3.2.12).
• The run-up and run-down rates will be 10 MW per minute for each unit or
higher if more than one machine is running up or running down at any
one time.
• The Piezo ignition system or an equivalent electrical gas ignition system
will be used.
• Standard gas turbine accessories, including oil pumps, water pumps, fin
fan coolers, electrical equipment and controls etc.
• The air intake system consisting of a bag filter.
AZURA EDO IPP
3-6
DRAFT EIA REPORT