Environmental Engineering Reference
In-Depth Information
3
Estimation of Mercury Emissions from
Coal-Fired Power Plants in China
3.1 Introduction
As the main energy source in China, the key role of coal in the industry is well
secured although its proportion in total primary energy consumption is predicted to
shrink in the future. It is predicted that coal shall remain as the cornerstone of en-
ergy security in the protection of the stability and the rapid development of the
national economy over the next several decades. The mercury in coal is released
during combustion, and some is captured by air pollution control devices. However,
most of the Hg
(g)
is emitted into the flue gas, which leads to air pollution. Therefore,
determining the mercury emission factor and estimating the mercury emission in
China are important tasks. This section mainly introduces the processes of deter-
mining the estimated formula of mercury emissions, estimating mercury emissions
in coal-fired flue gas, and predicting the future trend of mercury control in China.
3.2 Estimated Formula of Mercury Emissions
The following Eq. (3-1) was used to estimate the annual amount of Hg emitted into
the atmosphere from each coal-fired power plant. Eq. (3-1) considered some basic
conditions, such as coal type (coal production), coal cleaning, coal consumption
each year, boiler type, dust removal equipment, desulfuration, and so on.
C
Hg
(3-1)
E
M
ccf
EMF
coal
i
10
6
where
C
Hg
is the Hg concentration in coal (mg/kg);
M
coal
is the coal consumption
each year (tons/yr);
ccf
is the coal cleaning factor;
EMF
i
is the mercury emission
factor of different burner and different pollution control devices.
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