English for Material Science and Engineering
Ex.1
In order to improve the efficiency of existing precipitators, research has been
done in Germany into conditioning the waste gas by injecting SO
3 .
The research
has indicated that an injection of about 20
ppm
(volume basis) should be sufficient
to get the emission level down to below 50 mg/Nm
3
which will be the statutory
requirement in Germany (TA-Luft) from 1994. Similar requirements may flow on
to
the
rest
of
Europe.
Lungen
etal
.
Estimated
that
to
comply
with
the
new
regulations, gas cleaning could make up 35% of the cost of a new sinter plant.
Ex. 2
There
is
no
doubt
that
the
blast
furnace
will
remain
the
mainstay
of
iron
production although problems with the
quantity or cost and quality of coke, as
discussed
earlier,
may
have
some
effect.
The
first
tendency
will
be
further
elimination
of
small,
inefficient
units
and
their
partial
replacement
by
large
furnaces. Recall that the average production of the 263 operating blast furnaces
in the United States in 1960 was only 860 tons/day, while soon it is expected to
reach 2,350 tons/day from only 150 units.
Ex. 3
The converter technology can be characterized by two processes which occur