2) A period of monitor downtime begins when a required sample is not taken by its due date. A period of monitor downtime also begins on the date and hour that a required sample is taken, if invalid results are obtained. The period of monitor downtime ends on the date and hour of the next valid sample.
1) An hour of excess emissions shall be any unit operating hour in which the 4-hour rolling average NOx concentration exceeds the applicable emission limit in sub. (3) (a) 1. or 2. For the purposes of this section, a “4-hour rolling average NO
x concentration" is the arithmetic average of the average NOx concentration measured by the CEMS for a given hour (corrected to 15% O2 and, if required under sub. (6) (c) 1., to ISO standard conditions) and the 3 unit operating hour average NOx concentrations immediately preceding that unit operating hour.
2) A period of monitor downtime shall be any unit operating hour in which sufficient data are not obtained to validate the hour, for either NOx concentration or diluent, or both.
3) Each report shall include the ambient conditions (temperature, pressure and humidity) at the time of the excess emission period and, if the owner or operator has claimed an emission allowance for fuel bound nitrogen, the nitrogen content of the fuel during the period of excess emissions. You do not have to report ambient conditions if you opt to use the worst case ISO correction factor as specified in par. (b) 3. b., or if you are not using the ISO correction equation under the provisions of sub. (6) (c) 1.
NR 440.50(5)(j)1.d.
d. For owners or operator that elect, under
par. (f), to monitor combustion parameters or parameters that document proper operation of the NO
x emission controls:
1) An excess emission shall be a 4-hour rolling unit operating hour average in which any monitored parameter does not achieve the target value or is outside the acceptable range defined in the parameter monitoring plan for the unit.
2) A period of monitor downtime shall be a unit operating hour in which any of the required parametric data are either not recorded or are invalid.
NR 440.50(5)(j)2.
2. 'Sulfur dioxide.' If the owner or operator is required to monitor the sulfur content of the fuel under
par. (h):
NR 440.50(5)(j)2.a.
a. For samples of gaseous fuel and for oil samples obtained using daily sampling, flow proportional sampling, or sampling from the unit's storage tank, an excess emission occurs each unit operating hour included in the period beginning on the date and hour of any sample for which the sulfur content of the fuel being fired in the gas turbine exceeds 0.8 weight percent and ending on the date and hour that a subsequent sample is taken that demonstrates compliance with the sulfur limit.
NR 440.50(5)(j)2.b.
b. If the option to sample each delivery of fuel oil has been selected, the owner or operator shall immediately switch to one of the other oil sampling options, that is, daily sampling, flow proportional sampling, or sampling from the unit's storage tank, if the sulfur content of a delivery exceeds 0.8 weight percent. The owner or operator shall continue to use one of the other sampling options until all of the oil from the delivery has been combusted, and shall evaluate excess emissions according to
par. (j) 2. a. When all of the fuel from the delivery has been burned, the owner or operator may resume using the as-delivered sampling option.
NR 440.50(5)(j)2.c.
c. A period of monitor downtime begins when a required sample is not taken by its due date. A period of monitor downtime also begins on the date and hour of a required sample, if invalid results are obtained. The period of monitor downtime shall include only unit operating hours, and ends on the date and hour of the next valid sample.
NR 440.50(5)(j)3.
3. `Ice fog.' Each period during which an exemption provided in
sub. (3) (f) is in effect shall be reported in writing to the department quarterly. For each period, the ambient conditions existing during the period, the date and time the air pollution control system was deactivated and the date and time the air pollution control system was reactivated shall be reported. All quarterly reports shall be postmarked by the 30th day following the end of each calendar quarter.
NR 440.50(5)(j)4.
4. `Emergency fuel.' Each period during which an exemption provided in
sub. (3) (k) is in effect shall be included in the report required in
s. NR 440.07 (3). For each period, the type, reasons, and duration of the firing of the emergency fuel shall be reported.
NR 440.50(6)(a)(a) The owner or operator shall conduct the performance tests required in
s. NR 440.08 using one of the following:
NR 440.50(6)(b)1.
1. Sampling traverse points are to be selected following Method 20 or Method 1 (non-particulate procedures) and sampled for equal time intervals. The sampling shall be performed with a traversing single-hole probe or, if feasible, with a stationary multi-hole probe that samples each of the points sequentially. Alternatively, a multi-hole probe designed and documented to sample equal volumes from each hole may be used to sample simultaneously at the required points.
NR 440.50(6)(b)2.
2. Notwithstanding
subd. 1., the owner or operator may test at fewer points than are specified in Method 1 or Method 20 if the following conditions are met:
NR 440.50(6)(b)2.b.
b. Once the stratification sampling is completed, the owner or operator may use one of the following alternative sample point selection criteria for the performance test:
1) If each of the individual traverse point NOx concentrations, normalized to 15% O2, is within ± 10% of the mean normalized concentration for all traverse points, then you may use 3 points located either 16.7, 50.0 and 83.3% of the way across the stack or duct, or, for circular stacks or ducts greater than 2.4 meters (7.8 feet) in diameter, at 0.4, 1.2 and 2.0 meters from the wall. The 3 points shall be located along the measurement line that exhibited the highest average normalized NOx concentration during the stratification test.
2) If each of the individual traverse point NOx concentrations, normalized to 15% O2, is within ± 5% of the mean normalized concentration for all traverse points, then you may sample at a single point, located at least one meter from the stack wall or at the stack centroid.
NR 440.50(6)(b)3.
3. Other acceptable alternative reference methods and procedures are given in
par. (d).
NR 440.50(6)(c)
(c) The owner or operator shall determine compliance with the applicable nitrogen oxides emission limitation in
sub. (3) and shall meet the performance test requirements of
s. NR 440.08 as follows:
NR 440.50(6)(c)1.
1. For each run of the performance test, the mean nitrogen oxides emission concentration (NO
xo) corrected to 15% O
2 shall be corrected to ISO standard conditions using the following equation. Notwithstanding this requirement, use of the ISO correction equation is optional for: lean premix stationary combustion turbines; units used in association with heat recovery steam generators (HRSG) equipped with duct burners; and units equipped with add-on emission control devices: -
See PDF for diagram 
where:
NOx is the emission concentration of NOx at 15% O2 and ISO standard ambient conditions, ppm by volume, dry basis
NOxo is the mean observed NOx concentration, ppm by volume, dry basis, at 15% O2
Pr is the reference combustor inlet absolute pressure at 101.3 kilopascals ambient pressure, mm Hg
Po is the observed combustor inlet absolute pressure at test, mm Hg
Ho is the observed humidity of ambient air, g H2O/g air
e is the transcendental constant, 2.718
Ta is the ambient temperature, K
NR 440.50(6)(c)2.
2. The 3-run performance test required by
s. NR 440.08 shall be performed within
± 5% at 30, 50, 75 and 90-to-100% of peak load or at 4 evenly-spaced load points in the normal operating range of the gas turbine, including the minimum point in the operating range and 90-to-100% of peak load, or at the highest achievable load point if 90-to-100% of peak load cannot be physically achieved in practice. If the turbine combusts both oil and gas as primary or backup fuels, separate performance testing is required for each fuel. Notwithstanding these requirements, performance testing is not required for any emergency fuel, as defined in
sub. (2) (e).
NR 440.50(6)(c)3.
3. For a combined cycle turbine system with supplemental heat (duct burner), the owner or operator may elect to measure the turbine NO
x emissions after the duct burner rather than directly after the turbine. If the owner or operator elects to use this alternative sampling location, the applicable NO
x emission limit in
sub. (3) for the combustion turbine shall still be met.
NR 440.50(6)(c)4.
4. If water or steam injection is used to control NO
x with no additional post-combustion NO
x control and the owner or operator chooses to monitor the steam or water to fuel ratio in accordance with
sub. (5) (a), then that monitoring system shall be operated concurrently with each EPA Method 20, ASTM D6522-00, incorporated by reference in
s. NR 440.17 (2) (a) 70., or Method 7E run and shall be used to determine the fuel consumption and the steam or water to fuel ratio necessary to comply with the applicable
sub. (3) NO
x emission limit.
NR 440.50(6)(c)5.
5. If the owner operator elects to claim an emission allowance for fuel bound nitrogen as described in
sub. (3), then concurrently with each reference method run, a representative sample of the fuel used shall be collected and analyzed, following the applicable procedures described in
subd. 9. These data shall be used to determine the maximum fuel nitrogen content for which the established water or steam to fuel ratio will be valid.
NR 440.50(6)(c)6.
6. If the owner or operator elects to install a CEMS, the performance evaluation of the CEMS may either be conducted separately, as described in
subd. 7., or as part of the initial performance test of the affected unit.
NR 440.50(6)(c)7.
7. If the owner or operator elects to install and certify a NO
x CEMS under
sub. (5) (e), then the initial performance test required under
s. NR 440.08 may be done in the following alternative manner:
NR 440.50(6)(c)7.a.
a. Perform a minimum of 9 reference method runs, with a minimum time per run of 21 minutes, at a single load level, between 90 and 100% of peak, or the highest physically achievable, load.
NR 440.50(6)(c)7.b.
b. Use the test data both to demonstrate compliance with the applicable NO
x emission limit under
sub. (3) and to provide the required reference method data for the RATA of the CEMS described under
sub. (5) (b).
NR 440.50(6)(c)8.
8. If the owner or operator is required under
sub. (5) (f) to monitor combustion parameters or parameters indicative of proper operation of NO
x emission controls, the appropriate parameters shall be continuously monitored and recorded during each run of the initial performance test, to establish acceptable operating ranges, for purposes of the parameter monitoring plan for the affected unit, as specified in
sub. (5) (g).
NR 440.50(6)(c)9.
9. To determine the fuel bound nitrogen content of fuel being fired if an emission allowance is claimed for fuel bound nitrogen, the owner or operator may use equipment and procedures meeting the requirements of the following:
NR 440.50(6)(c)9.a.
a. For liquid fuels, ASTM D2597-94 (reapproved 1999), D4629-02, D5762-02 or D6366-99, incorporated by reference in
s. NR 440.17 (2) (a) 33., 60., 66. and 70., respectively.
NR 440.50(6)(c)9.b.
b. For gaseous fuels, analytical methods and procedures that are accurate to within 5% of the instrument range and are approved by the department.
NR 440.50(6)(c)10.
10. If the owner or operator is required under
sub. (5) (i) 1. or 3 to periodically determine the sulfur content of the fuel combusted in the turbine, a minimum of 3 fuel samples shall be collected during the performance test. The samples shall be analyzed for the total sulfur content of the fuel using:
NR 440.50(6)(c)10.a.
a. For liquid fuels, ASTM D129–00, D1266–98, D1552–01, D2622–98, D4294–02 or D5453–00, incorporated by reference in
s. NR 440.17 (2) (a) 8., 18., 20., 34., 55. and 64., respectively.
NR 440.50(6)(c)10.b.
b. For gaseous fuels, ASTM D1072–90 (Reapproved 1994), D3246–96, D4468–85 (Reapproved 2000) or D6667–01, incorporated by reference in
s. NR 440.17 (2) (a) 15., 44., 59. and 72., respectively. The applicable ranges of some of the ASTM methods are not adequate to measure the levels of sulfur in some fuel gases. Dilution of samples before analysis, with verification of the dilution ratio, may be used, subject to the prior approval of the department.
NR 440.50(6)(c)11.
11. The fuel analyses required under
subds. 9. and
10. may be performed by the owner or operator, a service contractor retained by the owner or operator, the fuel vendor, or any other qualified agency.
NR 440.50(6)(d)
(d) The owner or operator may use the following as alternatives to the reference methods and procedures specified in this subsection:
NR 440.50(6)(d)1.
1. Instead of using the equation in
par. (c) 1., manufacturers may develop ambient condition correction factors to adjust the nitrogen oxides emission level measured by the performance test as provided in
s. NR 440.08 to ISO standard day conditions.
NR 440.50 History
History: Cr.
Register, January, 1984, No. 337, eff. 2-1-84; am. (3) (d), renum. (6) (b) 2. to be 2. a. and am., cr. (6) (b) 2. b.,
Register, September, 1986, No. 369, eff. 10-1-86; renum. (1) to be (1) (a), cr. (1) (b), am. (2) (intro.), (3) (a) 3., (6) (a) 1. b. and (b) 2. a., r. (2) (o),
Register, September, 1990, No. 417, eff. 10-1-90; r. and recr. (6),
Register, July, 1993, No. 451, eff. 7-1-9
3; am. (3) (a) 3., (j), (5) (c) 3.,
Register, December, 1995, No. 480, eff. 1-1-96
; correction in (6) (f) 1. made under s. 13.93 (2m) (b) 7., Stats.,
Register, November, 1999, No. 527;
CR 06-109: am. (1) (a), (2) (p), (3) (a) 1. and 2., (4) (b), (5) (a), (6) (c) (intro.), 1. and 2., cr. (2) (bg), (br), (fm), (km), (L), (t) and (u), (3) (a) 3., (5) (c) to (i) and (j) 5. and (6) (c) 4. to 11., renum. (3) (a) 3. to be (3 (a) 4. and am., r. and recr. (5) (b) and (c) 1. and 2., (6) (a), (b) and (c) 3., renum. (5) (c) (intro.) to be (5) (j) and am., renum. (5) (c) 3. and 4. to be (5) (j) 2. and 4., r. (6) (d) and (e) Register May 2008 No. 629, eff. 6-1-08; corrections in (6) (b) 3. and (c) 10. (intro.) made under s. 13.92 (4) (b) 7., Stats., Register May 2008 No. 629. NR 440.51
NR 440.51 Lime manufacturing plants. NR 440.51(1)
(1)
Applicability and designation of affected facility. NR 440.51(1)(a)(a) The provisions of this section are applicable to each rotary lime kiln used in the manufacture of lime.
NR 440.51(1)(b)
(b) The provisions of this section are not applicable to facilities used in the manufacture of lime at kraft pulp mills.
NR 440.51(1)(c)
(c) Any facility under
par. (a) that commences construction or modification after May 3, 1977, is subject to the requirements of this section.
NR 440.51(2)
(2) Definitions. As used in this section, terms not defined in this subsection have the meanings given in
s. NR 440.02.
NR 440.51(2)(a)
(a) “Lime manufacturing plant" means any plant which uses a rotary lime kiln to produce lime product from limestone by calcination.
NR 440.51(2)(b)
(b) “Lime product" means the product of the calcination process including, but not limited to, calcitic lime, dolomitic lime and dead-burned dolomite.
NR 440.51(2)(c)
(c) “Positive-pressure fabric filter" means a fabric filter with the fans on the upstream side of the filter bags.
NR 440.51(2)(d)
(d) “Rotary lime kiln" means a unit with an inclined rotating drum which is used to produce a lime product from limestone by calcination.
NR 440.51(2)(e)
(e) “Stone feed" means limestone feedstock and millscale or other iron oxide additives that become part of the product.
NR 440.51(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 rotary lime kiln any gases which:
NR 440.51(3)(a)1.
1. Contain particulate matter in excess of 0.30 kilogram per megagram of stone feed (0.60 lb/ton).
NR 440.51(3)(a)2.
2. Exhibit greater than 15% opacity when exiting from a dry emission control device.
NR 440.51(4)(a)(a) The owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate a continuous monitoring system, except as provided in
pars. (b) and
(c), to monitor and record the opacity of a representative portion of the gases discharged into the atmosphere from any rotary lime kiln. The span of this system shall be set at 40% opacity.
NR 440.51(4)(b)
(b) The owner or operator of any rotary lime kiln having a control device with a multiple stack exhaust or a roof monitor may, in lieu of the continuous opacity monitoring requirements of
par. (a), monitor visible emissions at least once per day of operation by using a certified visible emissions observer who, for each site where visible emissions are observed, will perform 3 Reference Method 9 tests and record the results. (Reference Method 9 of
40 CFR part 60, Appendix A, is incorporated by reference in
s. NR 440.17). Visible emission observation shall occur during normal operation of the rotary lime kiln at least once per day. For at least 3 6-minute periods, the opacity shall be recorded for any points where visible emissions are observed, and the corresponding feed rate of the kiln shall also be recorded. Records shall be maintained of any 6-minute average that is in excess of the emissions specified in
sub. (3) (a).
NR 440.51(4)(c)
(c) The owner or operator of any rotary lime kiln using a wet scrubbing emission control device subject to the provisions of this section may not be required to monitor the opacity of the gases discharged as required in
par. (a), but shall install, calibrate, maintain and operate the following continuous monitoring devices:
NR 440.51(4)(c)1.
1. A monitoring device for the continuous measurement of the pressure loss of the gas stream through the scrubber. The monitoring device shall be accurate within
" 250 pascals (one inch of water).
NR 440.51(4)(c)2.
2. A monitoring device for continuous measurement of the scrubbing liquid supply pressure to the control device. The monitoring device shall be accurate within
" 5% of the design scrubbing liquid supply pressure.
NR 440.51(4)(d)
(d) For the purpose of conducting a performance test under
s. NR 440.08 the owner or operator of any lime manufacturing plant subject to the provisions of this section shall install, calibrate, maintain and operate a device for measuring the mass rate of stone feed to any affected rotary lime kiln. The measuring device used shall be accurate within
" 5% of the mass rate over its operating range.
NR 440.51(4)(e)
(e) For the purpose of reports required under
s. NR 440.07 (3) periods of excess emissions that shall be reported are defined as all 6-minute periods during which the average opacity of the plume from any lime kiln subject to
par. (a) is greater than 15% or, in the case of wet scrubbers, any period in which the scrubber pressure drop is greater than 30% below the rate established during the performance test. If visible emission observations are made according to
par. (b), reports of excess emissions shall be submitted semiannually.
NR 440.51(5)(a)(a) 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 440.51(5)(b)
(b) The owner or operator shall determine compliance with the particulate matter standards in
sub. (3) (a) as follows:
NR 440.51(5)(b)1.
1. The emission rate (E) of particulate matter shall be computed for each run using the following equation:
E = (cs Qsd)/PK)
where:
E is the emission rate of particulate matter, kg/Mg (lb/ton) of stone feed
cs is the concentration of particulate matter, g/dscm (gr/dscf)
