Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 125
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146 IRON AND STEEL PLANTS:
ELECTRIC ARC FURNACES - SUBPART AA
§60.270 - 60.275
Introduction
Affected facUities under this subpart include the electric arc furnace
(EAF) and associated dust-handling equipment.
Electric arc furnace means any
furnace that produces molten steel by melting charge material with electric
arcs from carbon electrodes.
Dust-handling equipment means any equipment used
to handle particulate matter cnllected by an EAF control device.
The emission standard promulgated under this subpart limits particulate
matter discharge from an EAF control device to 12 mg/dscm (0.005'2 gr/dscf).
In addition, control device exhaust stacks shall not exhibit 3 percent opacity
or greater.
EmLasinns from the dust-handling equipment shall not be
~
10
percent opacity.
With respect to the EAF melt shop, emissions from the shop are limited to
o
percent .opacity except during:
•
charging periods, when the shop opacity may be greater
than zero but less than 20 percent.
•
tapping periods, when the shop opacity may be greater
than zero but less than 40 percent.
Where the EAF capture system is operated with the shop roof closed during charg-
ing ,and tapping/and emissions to the atmosphere are prevented until the roof is
opened after completion of the charge or tap, shop opacity standards shall apply
when the roof is opened and shall continue to apply for the time defined by the
charging and/or tapping periods.
Continuous opacity monitoring of emissions
from the control device is required.
Affected facilities constructed, recon-
structed or modified after October 21, 1974, are subject to the requirements of
this subpart.
~ess
Description
Electric arc furnaces (EAFs) for the production of steel have been in use
sLnce 1906.
The recent demand for higher quality alloy and stainless steels
is responsible for increasing use of EAFs.
It has been estimated that 20 per-
cent of the steel produced in the U.S. in' 1976 was made in EAFs and as open
hearth units are shut down, EAF units will see increasing use.
113
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