NR 440.43(2)(s)
(s) “Silicon metal" means any silicon alloy containing more than 96% silicon by weight.
NR 440.43(2)(t)
(t) “Silvery iron" means any ferrosilicon, as defined by ASTM A100-93 incorporated by reference in
s. NR 440.17 (2) (a) 2., which contains less than 30% silicon.
NR 440.43(2)(u)
(u) “Slag" means the more or less completely fused and vitrified matter separated during the reduction of a metal from its ore.
NR 440.43(2)(v)
(v) “Standard ferromanganese" means that alloy as defined by ASTM A99-82 (reapproved 1987), incorporated by reference in
s. NR 440.17 (2) (a) 1.
NR 440.43(2)(w)
(w) “Tapping" means the removal of slag or product from the electric submerged arc furnace under normal operating conditions such as removal of metal under normal pressure and movement by gravity down the spout into the ladle.
NR 440.43(2)(x)
(x) “Tapping period" means the time duration from initiation of the process of opening the tap hole until plugging of the tap hole is complete.
NR 440.43(2)(y)
(y) “Tapping station" means that general area where molten product or slag is removed from the electric submerged arc furnace.
NR 440.43(3)(a)(a) On and after the date on which the performance test required to be conducted by
s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any electric submerged arc furnace any gases which:
NR 440.43(3)(a)1.
1. Exit from a control device and contain particulate matter in excess of 0.45 kg/MW-hr (0.99 lb/MW-hr) while silicon metal, ferrosilicon, calcium silicon or silicomanganese zirconium is being produced.
NR 440.43(3)(a)2.
2. Exit from a control device and contain particulate matter in excess of 0.23 kg/MW-hr (0.51 lb/MW-hr) while high-carbon ferrochrome, charge chrome, standard ferromanganese, silicomanganese, calcium carbide, ferrochrome silicon, ferromanganese silicon or silvery iron is being produced.
NR 440.43(3)(a)4.
4. Exit from an electric submerged arc furnace and escape the capture system and are visible without the aid of instruments. The requirements of this subdivision apply only during periods when flow rates are being established under
sub. (6) (d).
NR 440.43(3)(a)5.
5. Escape the capture system at the tapping station and are visible without the aid of instruments for more than 40% of each tapping period. There are no limitations on visible emissions under this subdivision when a blowing tap occurs. The requirements of this subdivision apply only during periods when flow rates are being established under
sub. (6) (d).
NR 440.43(3)(b)
(b) On and after the date on which the performance test required to be conducted by
s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any dust-handling equipment any gases which exhibit 10% opacity or greater.
NR 440.43(4)(a)(a) On and after the date on which the performance test required to be conducted by
s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any electric submerged arc furnace any gases which contain, on a dry basis, 20 or greater volume % of carbon monoxide. Combustion of such gases under conditions acceptable to the department constitutes compliance with this subsection. Acceptable conditions include, but are not limited to, flaring of gases or use of gases as fuel for other processes.
NR 440.43(5)(a)(a) The owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate a continuous monitoring system for measurement of the opacity of emissions discharged into the atmosphere from control devices.
NR 440.43(5)(b)
(b) For the purpose of reports required under
s. NR 440.07 (3), the owner or operator shall report as excess emissions all 6-minute periods in which the average opacity is 15% or greater.
NR 440.43(5)(c)
(c) The owner or operator subject to the provisions of this section shall submit a written report of any product change to the department. Reports of product changes shall be postmarked not later than 30 days after implementation of the product change.
NR 440.43(6)(a)(a) The owner or operator of any electric submerged arc furnace subject to the provisions of this section shall maintain daily records of the following information:
NR 440.43(6)(a)2.
2. Description of constituents of furnace charge, including the quantity, by weight.
NR 440.43(6)(a)3.
3. Time and duration of each tapping period and the identification of material tapped (slag or product).
NR 440.43(6)(a)5.
5. All flow rate data obtained under
par. (c) or all fan motor power consumption and pressure drop data obtained under
par. (e).
NR 440.43(6)(b)
(b) The owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate a device to measure and continuously record the furnace power input. The furnace power input may be measured at the output or input side of the transformer. The device must have an accuracy of
"5% over its operating range.
NR 440.43(6)(c)
(c) The owner or operator subject to the provisions of this section shall install, calibrate and maintain a monitoring device that continuously measures and records the volumetric flow rate through each separately ducted hood of the capture system, except as provided under
par. (e). The owner or operator of an electric submerged arc furnace that is equipped with a water cooled cover which is designed to contain and prevent escape of the generated gas and particulate matter shall monitor only the volumetric flow rate through the capture system for control of emissions from the tapping station. The owner or operator may install monitoring devices in any appropriate location in the exhaust duct such that reproducible flow rate monitoring will result. The flow rate monitoring device shall have an accuracy of
"10% over its normal operating range and shall be calibrated according to the manufacturer's instructions. The department may require the owner or operator to demonstrate the accuracy of the monitoring device relative to Methods 1 and 2 of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17.
NR 440.43(6)(d)
(d) When performance tests are conducted under the provisions of
s. NR 440.08 to demonstrate compliance with the standards under
sub. (3) (a) 4. and
5., the volumetric flow rate through each separately ducted hood of the capture system shall be determined using the monitoring device required under
par. (c). The volumetric flow rates shall be determined for furnace power input levels at 50 and 100% of the nominal rated capacity of the electric submerged arc furnace. At all times the electric submerged arc furnace is operated, the owner or operator shall maintain the volumetric flow rate at or above the appropriate levels for that furnace power input level determined during the most recent performance test. If emissions due to tapping are captured and ducted separately from emissions of the electric submerged arc furnace, during each tapping period the owner or operator shall maintain the exhaust flow rates through the capture system over the tapping station at or above the levels established during the most recent performance test. Operation at lower flow rates may be considered by the department to be unacceptable operation and maintenance of the affected facility. The owner or operator may request that these flow rates be reestablished by conducting new performance tests under
s. NR 440.08.
NR 440.43(6)(e)
(e) The owner or operator may as an alternative to
par. (c) determine the volumetric flow rate through each fan of the capture system from the fan power consumption, pressure drop across the fan and the fan performance curve. Only data specific to the operation of the affected electric submerged arc furnace shall be acceptable for demonstration of compliance with the requirements of this paragraph. The owner or operator shall maintain on file a permanent record of the fan performance curve (prepared for a specific temperature) and shall:
NR 440.43(6)(e)1.
1. Install, calibrate, maintain and operate a device to continuously measure and record the power consumption of the fan motor (measured in kilowatts), and
NR 440.43(6)(e)2.
2. Install, calibrate, maintain and operate a device to continuously measure and record the pressure drop across the fan. The fan power consumption and pressure drop measurements shall be synchronized to allow real time comparisons of the data. The monitoring devices shall have an accuracy of
"5% over their normal operating ranges.
NR 440.43(6)(f)
(f) The volumetric flow rate through each fan of the capture system shall be determined from the fan power consumption, fan pressure drop, and fan performance curve specified under
par. (e), during any performance test required under
s. NR 440.08 to demonstrate compliance with the standards under
sub. (3) (a) 4. and
5. The owner or operator shall determine the volumetric flow rate at a representative temperature for furnace power input levels of 50 and 100% of the nominal rated capacity of the electric submerged arc furnace. At all times the electric submerged arc furnace is operated, the owner or operator shall maintain the fan power consumption and fan pressure drop at levels such that the volumetric flow rate is at or above the levels established during the most recent performance test for that furnace power input level. If emissions due to tapping are captured and ducted separately from emissions of the electric submerged arc furnace, during each tapping period the owner or operator shall maintain the fan power consumption and fan pressure drop at levels such that the volumetric flow rate is at or above the levels established during the most recent performance test. Operation at lower flow rates may be considered by the department to be unacceptable operation and maintenance of the affected facility. The owner or operator may request that these flow rates be reestablished by conducting new performance tests under
s. NR 440.08. The department may require the owner or operator to verify the fan performance curve by monitoring necessary fan operating parameters and determining the gas volume moved relative to Methods 1 and 2 of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17.
NR 440.43(6)(g)
(g) All monitoring devices required under
pars. (c) and
(e) shall be checked for calibration annually in accordance with the procedures under
s. NR 440.13 (2).
NR 440.43(7)(a)(a) During any performance test required in
s. NR 440.08, the owner or operator may not allow gaseous diluents to be added to the effluent gas stream after the fabric in an open pressurized fabric filter collector unless the total gas volume flow from the collector is accurately determined and considered in the determination of emissions.
NR 440.43(7)(b)
(b) In conducting the performance tests required in
s. NR 440.08, the owner or operator shall use as reference methods and procedures the test methods in Appendix A of
40 CFR part 60, incorporated by reference in
s. NR 440.17, or other methods and procedures as specified in this subsection, except as provided in
s. NR 440.08 (2).
NR 440.43(7)(c)
(c) The owner or operator shall determine compliance with the particulate matter standards in
sub. (3) as follows:
where:
E is the emission rate of particulate matter, kg/MW-hr (lb/MW-hr)
N is the total number of exhaust streams at which emissions are quantified
Csi is the concentration of particulate matter from exhaust stream “i", g/dscm (gr/dscf)
Qsdi is the volumetric flow rate of effluent gas from exhaust stream “i", dscm/hr (dscf/hr)
P is the average furnace power input, MW
K is the conversion factor, 1000 g/kg (7000 gr/lb)
NR 440.43(7)(c)2.
2. Method 5 shall be used to determine the particulate matter concentration (C
si) and volumetric flow rate (Q
sdi) of the effluent gas, except that the heating systems specified in sections 2.1.2 and 2.1.6 of Method 5 are not to be used when the carbon monoxide content of the gas stream exceeds 10% by volume, dry basis. If a flare is used to comply with
sub. (4), the sampling site shall be upstream of the flare. The sampling time shall include an integral number of furnace cycles.
NR 440.43(7)(c)2.a.
a. When sampling emissions from open electric submerged arc furnaces with wet scrubber control devices, sealed electric submerged arc furnaces or semienclosed electric arc furnaces, the sampling time and sample volume for each run shall be at least 60 minutes and 1.80 dscm (63.6 dscf).
NR 440.43(7)(c)2.b.
b. When sampling emissions from other types of installations, the sampling time and sample volume for each run shall be at least 200 minutes and 5.66 dscm (200 dscf).
NR 440.43(7)(c)3.
3. The measurement device of
sub. (6) (b) shall be used to determine the average furnace power input (P) during each run.
NR 440.43(7)(c)5.
5. The emission rate correction factor, integrated sampling procedures of Method 3B shall be used to determine the CO concentration. The sample shall be taken simultaneously with each particulate matter sample.
NR 440.43(7)(d)
(d) During the particulate matter run, the maximum open hood area, in hoods with segmented or otherwise moveable sides, under which the process is expected to be operated and remain in compliance with all standards shall be recorded. Any future operation of the hooding system with open areas in excess of the maximum is not permitted.
NR 440.43(7)(e)
(e) To comply with
sub. (6) (d) or
(f), the owner or operator shall use the monitoring devices in
sub. (6) (c) or
(e) to make the required measurements as determined during the performance test.
NR 440.43 History
History: Cr.
Register, January, 1984, No. 337, eff. 2-1-84; am. (2) (intro.),
Register, September, 1990, No. 417, eff. 10-1-90; r. and recr. (7),
Register, July, 1993, No. 451, eff. 8-1-93;
CR 06-109: am. (2) (c), (i), (k), (o), (q), (t) and (v) and (7) (c) 1. and 2. b. Register May 2008 No. 629, eff. 6-1-08. NR 440.44
NR 440.44 Steel plants: electric arc furnaces constructed after October 21, 1974, and on or before August 17, 1983. NR 440.44(1)(1)
Applicability and designation of affected facility. NR 440.44(1)(a)(a) The provisions of this section are applicable to the following affected facilities in steel plants that produce carbon, alloy, or specialty steels: electric arc furnaces and dust-handling systems.
NR 440.44(1)(b)
(b) The provisions of this section apply to each affected facility identified under
par. (a) that commenced construction, modification, or reconstruction after October 21, 1974 and on or before August 17, 1983.
NR 440.44(2)
(2) Definitions. As used in this section, terms not defined in this subsection have the meanings given in
s. NR 440.02.
NR 440.44(2)(a)
(a) “Bag leak detection system" means a system that is capable of continuously monitoring relative particulate matter (dust) loadings in the exhaust of a baghouse to detect bag leaks and other conditions that result in increases in particulate loadings. A bag leak detection system includes an instrument that operates on triboelectric, electrodynamic, light scattering, light transmittance, or other effect to continuously monitor relative particulate matter loadings.
NR 440.44(2)(am)
(am) “Capture system" means the equipment (including ducts, hoods, fans, dampers, etc.) used to capture or transport particulate matter generated by an EAF to the air pollution control device.
NR 440.44(2)(b)
(b) “Charge" means the addition of iron and steel scrap or other materials into the top of an electric arc furnace.
NR 440.44(2)(c)
(c) “Charging period" means the time period commencing at the moment an EAF starts to open and ending either 3 minutes after the EAF roof is returned to its closed position or 6 minutes after commencement of opening of the roof, whichever is longer.
NR 440.44(2)(d)
(d) “Control device" means the air pollution control equipment used to remove particulate matter generated by one or more EAFs from the effluent gas stream.
NR 440.44(2)(e)
(e) “Direct shell evacuation control system" or “DEC system" means any system that maintains a negative pressure within the EAF above the slag or metal and ducts these emissions to the control device.
NR 440.44(2)(f)
(f) “Dust-handling equipment" means any equipment used to handle particulate matter collected by the control device and located at or near the control device for an EAF subject to this section.
NR 440.44(2)(g)
(g) “Electric arc furnace" or “EAF" means any furnace that produces molten steel and heats the charge materials with electric arcs from carbon electrodes. Furnaces that continuously feed direct-reduced iron ore pellets as the primary source of iron are not affected facilities within the scope of this definition.
NR 440.44(2)(h)
(h) “Heat time" means the period commencing when scrap is charged to an empty EAF and terminating when the EAF tap is completed.
NR 440.44(2)(i)
(i) “Meltdown and refining" means that phase of the steel production cycle when charge material is melted and undesirable elements are removed from the metal.
NR 440.44(2)(j)
(j) “Meltdown and refining period" means the time period commencing at the termination of the initial charging period and ending at the initiation of the tapping period, excluding any intermediate charging periods and times when power to the EAF is off.
NR 440.44(2)(k)
(k) “Shop" means the building which houses one or more EAFs.
NR 440.44(2)(L)
(L) “Shop opacity" means the arithmetic average of 24 or more opacity observations of emissions from the shop taken in accordance with Method 9 of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17, for the applicable time periods.
NR 440.44(2)(n)
(n) “Tapping period" means the time period commencing at the moment an EAF begins to pour molten steel and ending either 3 minutes after steel ceases to flow from an EAF, or 6 minutes after steel begins to flow, whichever is longer.
NR 440.44(3)(a)(a) On and after the date on which the performance test required to be conducted by
s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from an electric arc furnace any gases which:
NR 440.44(3)(a)1.
1. Exit from a control device and contain particulate matter in excess of 12 mg/dscm (0.0052 gr/dscf).
NR 440.44(3)(a)3.
3. Exit from a shop and, due solely to operations of any EAFs, exhibit 6% opacity or greater except:
NR 440.44(3)(a)3.c.
c. The shop opacity standards of this subdivision shall apply only during periods when the monitoring parameter limits specified in
sub. (5) (b) are being established according to
sub. (5) (c) and
(g), unless the owner or operator elects to perform daily shop opacity observations in lieu of furnace static pressure monitoring as provided for under
sub. (4) (d).
NR 440.44(3)(a)3.d.
d. Where the capture system is operated such that the roof of the shop is closed during the charge and the tap, and emissions to the atmosphere are prevented until the roof is opened after completion of the charge or tap, the shop opacity standards of this subdivision apply when the roof is opened and continue to apply for the length of time defined by the charging or tapping periods, or both.
NR 440.44(3)(b)
(b) On and after the date on which the performance test required to be conducted by
s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from dust-handling equipment any gases which exhibit 10% opacity or greater.
NR 440.44(4)(a)(a) A continuous monitoring system for the measurement of the opacity of emissions discharged into the atmosphere from control devices shall be installed, calibrated, maintained and operated by the owner or operator subject to the provisions of this section.
