Sustainability Report ENEVA 2020
9.2
AIR
EMISSIONS
[GRI 103-1 | 103-2 | 103-3-305 | EM-EP-120A.1 | IF-EU-120A.1]
One of the main impacts of energy generation and E&P activities is air
emissions, the largest source being associated with the burning of fuel
(coal and natural gas) to generate energy. Thus, due to its relevance, in
2020 we established a corporate procedure for Air Emissions Management,
which describes the management process that must be considered in the
monitoring and control of regulated air emissions and Greenhouse Gas
(GHG) emissions from each operational asset, seeking to mitigate the
impacts of activities on air quality in the area of influence; comply with the
legal limits of emissions required under current Brazilian environmental
laws, adopting control standards compatible with the best market practices;
and manage GHG emissions. The procedure standardizes the performance
of all operational units, also establishing that all of them must keep control
of their air emissions by means of an inventory of emissions for gases
regulated by law and GHG - in line with the GHG Protocol methodology. The
goal is to know and understand the air emissions of the business based
on the results of the inventory, making it possible to map improvement
opportunities, which can be through process modification, fuel and/or raw
material replacement, change in operational procedures, or improvement/
replacement of emission control systems.
In all our generation assets, we monitor our regulated emissions through
the Continuous Emissions Monitoring System (CEMS), internationally
recognized and recommended by the United States Environmental
Protection Agency (US EPA) to determine the concentration of gases
and particulate matter.
To do so, we have sensors installed inside the chimneys, with data updated
every 15 minutes, which enables continuous monitoring, 24 hours a day. In
2020, the existing systems were strictly maintained.
All our plants - with the exception of the Parnaíba IV TPP, which is
composed of engines that do not have current regulations for the control
and monitoring of air emissions - use technology called Low-Nox, which
has the premise of low NOx emissions. The assembly formed by the
combustion system and the boiler adopts the two-stage burner design,
minimizing air injection and controlling the combustion temperature. Coal-
fired plants also use SOx abatement equipment, the Semi-Dryer Absorber
(SDA), and bag filters to reduce solid particulate emissions. In addition, the
unloading of imported coal - which has a higher calorific power compared
to the national coal, reduces fuel consumption and, consequently, CO2e/
MWh emissions - that is stored in our plants is done by conveyor belts
that are enclosed in order to avoid fugitive emissions and noise. We have
developed specific procedures to move the coal piles in our yards, and we
apply chemicals (polymer) that bind the coal and water particles at specific
times when the piles are being moved, thus preventing coal particles from
being spread by the wind.
Air Emissions
Emissions of Nox, SOx and other significant air emissions
[GRI 305-7]
NOX
SOX
2018
2019
2020
3,513,180.00 3,397,160.00 2,589,638.25
10,394,890.00 11,185,630.00 7,481,710.00
Particulate Matter
267,880.00 282,900.00 181,380.00
(PM)
Other categories
NA
NA
124,032.48
(CO emissions)
Note: Continuous and direct measurements
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SUSTAINABILITY REPORT ENEVA 2020
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