Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 69
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146 Introduction
The standi
that co.mbust
Wl
produced by mUJ
(2205 lbs) per
a:lone are not
j
and opacity is
etructed or moe
Process Descri]
There are
tion of practi{
Incinerat'
combustion.
T~
by mechanical
I
successively il
should be appl
brought on lin,
to prepare slu
1
Two major
mul tip Ie heart
between these
furnaces emplo
, of
all~metal
c
for air pollut
The wet a
principle that
of liquid wate
pollution is m
peratures and
Some particula
used to contro
Introduction
IRON AND STEEL PLANTS - SUBPART N
§60.l40 - 60.144
The NSPS for jron and steel plants applies to the basic oxygen
steel production.
The facility affected under this subpart is the
I
process furnace (BOPF) which produces steel by refining a high carb4
charge using a large volume of an oxygen-rich gas.
The mass emission standard promulgated under this subpart statl
gases discharged from a BOPF shall not contain particulate matter il
of 50 mg/dscm (0.022 gr/dscf).
In addition, the exhaust gas from a
device shall not exhibit an opacity of 10 percent or greater, excepl
opacity of greater than 10 percent but less than 20 percent may oCC\
per steel production cycle.
Facilities constructed, reconstructed
4
after June 11, 1973, are subject to the requirements of this subparl
Process
D~scriptlon
Steelmaking by a BOPF involves the melting, mixing and subsequE
of scrap metal, molten iron, and fluxes charged to the vessel by thE
of a h:Lgh volume of an oxygen-rich gas.
Oxygen may be top blown int
vessel by a water-cooled retractable lance or bottom blown
through·~
fixed tuyeres.
The former method- is the more common type of BOPF. ,
the latter is a recent process modification specific to the Quelle-I
Oxygen Process (Q-BOP) furnace.
A simplified flow diagram outlinin,
making in a BOPF is presented in Figure II.
The oxygen blow commences immediately following charging and c(
for
6
predetermined length of time depending on the grade of steel c
the charge composition.
After the blow. the molten steel is checkec
mine
if
the endpoint chemical composition and proper tap temperaturE
attoined.
If the desired temperature has not been reached, oxygen
j
into the hath until the proper temperature is reached.
When the me]
the required grade specifications, the furnace is tapped.
Tapping
j
rotating the vessel. pouring the finished steel into a teeming ladlE
tapping, the vessel is rotated back through the vertical and alag
(t
wnFJte formed during refining) is poured from the furnace into pots ]
below the furnace floor.
Following slagging, the furnace
refractor~
and tap hole nre checked for wear before another heat is started.
TYllical air pollution control equipment installed' on BOP furnac
a primary hood to collect emissions during the
oxyge~
blow and possi
secondary hood and furnace enclosure to capture charging and
tappin~
53
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