Scrubber
Technology
Coal is re emerging as the dominant fuel for power generation for, the intermediate term (15-20 years). Use of coal today requires emission control devices different from those used in the last era of coal dominance. The, main objectionable emission among all is SO2. which is highly injurious to human, animal and agricultural life
The present strict restrictions on emissions by the Government nave forced this industry to become to a permissible level. The flue gas desulfarization (FGD) has become the basic necessity of the power plant as most of the inferior coal available, for power generation throughout the world contain 3 to 4 % sulphur.
The
equipment
used
for
removing
SO2
is
know
as
scrubber,
a
major
equipment
feature
of
coal
fired
power
plant
Sulphur
in
coal
cannot
be
destroyed,
it
can
only
be
converted
to
one
form
or
other.
The
technology
of
FOD
is
therefore
one
of
conversion.
The
technology
used
is
generally
split
according
to
the
type
of
end
product
generated,
rather
than
by
the
exact
chemical
route
used.
This
technology
is
generally
classified
as
Non-Regenerable
or
throwaway
process
which
produces
sulphate
salts
which
are
worthless
and
discharged
and
Regenerable
process
which
produces
sulphur
or
H2SO
from
the
collected
material
The
throwaway
system
has
been
developed
and
most
widely
used
type
today.
As
per
1978
estimates
nearly
94%
of
the
total
generation
used
this
type
of
scrubbing
system
for
an
effective
removal
of
SO2.
The
basic
attraction
is
the
requirement
of
simple
equipment,
easy
pH
control
and
cheap
raw
material
used
makes
this
system
most
popular
and
economic
among
all
the
presently
available
techniques.
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