Ash
Handling
and
Dust
Collection
The
disposal
of
ashes
from
a
large
capacity
power
station
is
of
some
importance
as
it
is
10
to
20%
of
the
coal
used.
A
200
MW
capacity
power
plant
using
Indian
coals
produces
as
large
as
60,000
tons
of
ash
per
annum.
This
quantity
of
ash
is
equivalent
to
a
height
of
1.5
metres
covering
four
hectares
area.
This
shows
that
a
power
plant
of
200
MW
capacity
requires
160
hectares
area
during
its
life
time
if
the
ashes
produced
are
dumped
at
the
site
of
the
plant.
The
ashes
should
be
discharged
and
dumped
at
a
sufficient
distance
from
the
power
plant
because
of
following
reasons
(1)
The
ash
is
dusty,
therefore
irritating
and
annoying
to
handle.
(2)
It
is
sufficiently
hot
when
it
comes
out
of
the
boiler
furnaces.
(3)
It
produces
poisonous
gases
and
corrosive
acids
when
mixed
with
water.
The
ash
handling is
a
difficult
problem
and
sufficient
attention
should
be
given
to
design
the
ash
handling
plant.
The
difficulties
encountered
in
the
ash-handling
plant
layout
are
listed
below:
(I)
It
forms
clinkers
by
fusing
together
in
large
lumps
which
must
be
broken
before
given
to
any
reasonably
sized
conveying
equipment.
(2)
The
ash
produced
is
abrasive
and
will
wear
out
the
conveyor
parts
on
contact
with
it
therefore
special
conveyors
must
be
designed
to
handle
the
ashes.
(3)
The
ashes
must
be
cooled
before
carrying
from
the
furnace
collecting
hoppers
as
it
is
very
difficult
to
carry
hot
ashes.
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