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

3.2.10 Fire Protection
The gas turbine enclosures will be fitted with self-contained fire detection and
protection systems based on a carbon dioxide fire suppressant system (or
equivalent). For the auxiliary plant areas, a fire water system will be installed
comprising the following:
• a pump station using an electrical motor and diesel driven pumps as well
as a jockey pump for the sprinkler and deluge systems; and
• hydrant and hose points.
The two service/ fire water tanks (storage capacity of 700 m 3 ) will include a
fire water reserve in each tank of approximately 300 m 3 .
3.2.11 Control Room
The power plant will be operated from the plant control room. The control
room will comprise a two or three storey building housing cable flats,
electrical and electronic equipment, the main control room and some office
space. The control room will form an annex to the gas turbine building so that
the operators can access the gas turbine hall from the control room.
3.2.12 Overview of Emissions and Wastes
Atmospheric Emissions
The principal source of air emissions will arise from the combustion of natural
gas in the combustion cans of the gas turbines and also the operation of the
three small (3.7 MVA) diesel units. The air emissions of the latter however
will be significantly less, as it is anticipated that these units will run for less
than 100 h per year.
All air emissions will be released via a stack, the design of which will be
determined by detailed dispersion modelling to ensure that the stacks are of
the optimal diameter, and that the efflux velocity will be sufficiently high for
ground level air concentrations to be within the World Health Organization
(WHO) limits at all times. This standard will be applied even if the predicted
ground level concentrations from dispersion modelling are in a depopulated
area. The air dispersion modelling (ERM, 2011) has used four stacks 50 m
high, with a diameter of 14 m for the air dispersion modelling parameters.
The results of the air quality modelling are discussed in Chapter 7.
It is anticipated that four gas turbines will be used for power generation. An
open tender process will invite EPC contractors to tender for the construction
of the Project based on using E class gas turbines. There are a number of gas
turbines available on the market which complies with this specification,
namely GE 9E; Siemens V94.2; Alstom 13E2; and Mitsubishi 701DA, which all
produce similar levels of emissions.
AZURA EDO IPP
3-10
DRAFT EIA REPORT