Chapter NR 440

NR 440.19(5)(c) (c) When a fossil fuel containing at least 25%, by weight, of coal refuse is burned in combination with gaseous, liquid or other solid fossil fuel or wood residue, the standard for nitrogen oxides does not apply.

NR 440.19(5)(d) (d) Cyclone-fired units which burn fuels containing at least 25% of lignite that is mined in North Dakota, South Dakota or Montana remain subject to par. (a) 5. regardless of the types of fuel combusted in combination with that lignite.

NR 440.19(6) (6) Emission and fuel monitoring.

NR 440.19(6)(a) (a) Each owner or operator shall install, calibrate, maintain and operate continuous monitoring systems for measuring the opacity of emissions, sulfur dioxide emissions, nitrogen oxides emissions, and either oxygen or carbon dioxide except as provided in par. (b).

NR 440.19(6)(b) (b) Certain of the continuous monitoring system requirements under par. (a) do not apply to owners or operators under the following conditions:

NR 440.19(6)(b)1. 1. For a fossil-fuel-fired steam generator that burns only gaseous fossil fuel, continuous monitoring systems for measuring the opacity of emissions and sulfur dioxide emissions are not required.

NR 440.19(6)(b)2. 2. For a fossil-fuel-fired steam generator that does not use a flue gas desulfurization device, a continuous monitoring system for measuring sulfur dioxide emissions is not required if the owner or operator monitors sulfur dioxide emissions by fuel sampling and analysis.

NR 440.19(6)(b)3. 3. Notwithstanding s. NR 440.13 (2), installation of a continuous monitoring system for nitrogen oxides may be delayed until after the initial performance tests under s. NR 440.08 have been conducted. If the owner or operator demonstrates during the performance test that emissions of nitrogen oxides are less than 70% of the applicable standards in sub. (5), a continuous monitoring system for measuring nitrogen oxides emissions is not required. If the initial performance test results show that nitrogen oxide emissions are greater than 70% of the applicable standard, the owner or operator shall install a continuous monitoring system for nitrogen oxides within one year after the date of the initial performance tests under s. NR 440.08 and comply with all other applicable monitoring requirements under this chapter.

NR 440.19(6)(b)4. 4. If an owner or operator does not install any continuous monitoring systems for sulfur oxides and nitrogen oxides, as provided under subds. 1. and 3. or subds. 2. and 3., a continuous monitoring system for measuring either oxygen or carbon dioxide is not required.

NR 440.19(6)(c) (c) For performance evaluations under s. NR 440.13 (3) and calibration checks under s. NR 440.13 (4), the following procedures shall be used:

NR 440.19(6)(c)1. 1. Methods 6, 7 and 3B of 40 CFR part 60, Appendix A, incorporated by reference in s. NR 440.17, as applicable, shall be used for the performance evaluations of sulfur dioxide and nitrogen oxides continuous monitoring systems. Acceptable alternative methods for Methods 6, 7 and 3B are given in sub. (7) (d).

NR 440.19(6)(c)2. 2. Sulfur dioxide or nitric oxide, as applicable, shall be used for preparing calibration gas mixtures under Performance Specification 2 of 40 CFR part 60, Appendix B, incorporated by reference in s. NR 440.17.

NR 440.19(6)(c)3. 3. For affected facilities burning fossil fuel, the span value for a continuous monitoring system measuring the opacity of emissions shall be 80, 90 or 100% and for a continuous monitoring system measuring sulfur oxides or nitrogen oxides the span value shall be determined as follows: - See PDF for table

in which:

x is the fraction of total heat input derived from gaseous fossil fuel

y is the fraction of total heat input derived from liquid fossil fuel

z is the fraction of total heat input derived from solid fossil fuel

NR 440.19(6)(c)4. 4. All span values computed under subd. 3. for burning combinations of fossil fuels shall be rounded to the nearest 500 ppm.

NR 440.19(6)(c)5. 5. For a fossil-fuel-fired steam generator that simultaneously burns fossil fuel and nonfossil fuel, the span value of all continuous monitoring systems shall be subject to the department's approval.

NR 440.19(6)(e) (e) For any continuous monitoring system installed under par. (a), the conversion procedures of this paragraph shall be used to convert the continuous monitoring data into units of the applicable standards (ng/J, lb/million Btu).

NR 440.19(6)(e)1. 1. When a continuous monitoring system for measuring oxygen is selected, the measurement of the pollutant concentration and oxygen concentration shall each be on a consistent basis (wet or dry). Alternative procedures approved by the department shall be used when measurements are on a wet basis. When measurements are on a dry basis, the following conversion procedures shall be used:

E = CF [20.9/(20.9 - percent O2)]

where E, C, F, and percent O2 are determined under par. (f).

NR 440.19(6)(e)2. 2. When a continuous monitoring system for measuring carbon dioxide is selected, the measurement of the pollutant concentration and carbon dioxide concentration shall each be on a consistent basis (wet or dry) and the following conversion procedure shall be used:

E = CFc [100/percent CO2]

where E, C, Fc and percent CO2 are determined under par. (f).

NR 440.19(6)(f) (f) The values used in the equations under par. (e) 1. and 2. are derived as specified in this paragraph.

NR 440.19(6)(f)1. 1. E is the pollutant emissions, ng/J (lb/million Btu).

NR 440.19(6)(f)2. 2. C is the pollutant concentration, ng/dscm (lb/dscf), determined by multiplying the average concentration (ppm) for each one-hour period by 4.15 104 M ng/dscm per ppm (2.59 10-9 M lb/dscf per ppm) where M is the pollutant molecular weight, g/g-mole (lb/lb-mole). M = 64.07 for sulfur dioxide and 46.01 for nitrogen oxides.

NR 440.19(6)(f)3. 3. %O2 or %CO2 is the oxygen or carbon dioxide volume expressed as percent, determined with equipment specified under par. (a).

NR 440.19(6)(f)4. 4. F, Fc are a factor representing a ratio of the volume of dry flue gases generated to the calorific value of the fuel combusted (F), and a factor representing a ratio of the volume of carbon dioxide generated to the calorific value of the fuel combusted (Fc), respectively. Values of Fc and F are:

NR 440.19(6)(f)4.a. a. For anthracite coal as classified according to ASTM D388-99 (reapproved 2004), incorporated by reference in s. NR 440.17 (2) (a) 12., F = 2.723 x 10-7 dscm/J (10,140 dscf/million Btu) and Fc = 0.532 x 10-7 scm CO2/J (1,980 scf CO2/million Btu).

NR 440.19(6)(f)4.b. b. For subbituminous and bituminous coal as classified according to ASTM D388-99 (reapproved 2004), incorporated by reference in s. NR 440.17 (2) (a) 12., F = 2.637 10-7 dscm/J (9,820 dscf/million Btu) and Fc = 0.486 10-7 scm CO2/J (1,810 scf CO2/million Btu).

NR 440.19(6)(f)4.c. c. For liquid fossil fuels including crude, residual and distillate oils, F = 2.476 10-7 dscm/J (9,220 dscf/million Btu) and Fc = 0.384 10-7 scm CO2/J (1,430 scf CO2/million Btu).

NR 440.19(6)(f)4.d. d. For gaseous fossil fuels, F = 2.347 10-7 dscm/J (8,740 dscf/million Btu). For natural gas, propane and butane fuels, F c = 0.279 10-7 scm CO 2/J (1,040 scf CO2/million Btu) for natural gas, 0.322 10-7 scm CO2/J (1,200 scf CO2/million Btu) for propane, and 0.338 10-7 scm CO2/J (1,260 scf CO2/million Btu) for butane.

NR 440.19(6)(f)4.e. e. For bark, F = 2.589 10-7 dscm/J (9,640 dscf/million Btu) and Fc = 0.500 10-7 scm CO2/J (1,840 scf CO2/million Btu). For wood residue other than bark, F = 2.492 10-7 dscm/J (9,280 dscf/million Btu) and Fc = 0.494 10-7 scm CO2/J (1,860 scf CO2/million Btu).

NR 440.19(6)(f)4.f. f. For lignite coal as classified according to ASTM D388-99 (reapproved 2004), incorporated by reference in s. NR 440.17 (2) (a) 12., F = 2.659 10-7 dscm/J (9900 dscf/million Btu) and Fc = 0.516 10-7 scm CO2/J (1,920 scf CO2/million Btu).

NR 440.19(6)(f)5. 5. The owner or operator may use the following equation to determine an F factor (dscm/J or dscf/million Btu) on a dry basis (if it is desired to calculate F on a wet basis, consult the department) or Fc factor (scm CO2/J, or scf CO2/million Btu) on either basis in lieu of the F or Fc factors specified in subd. 4.: - See PDF for diagram

NR 440.19(6)(f)5.a. a. H, C, S, N and O are content by weight of hydrogen, carbon, sulfur, nitrogen and oxygen (expressed as percent), respectively, as determined on the same basis as GCV by ultimate analysis of the fuel fired, using ASTM method D3178-89 or D3176-89 (solid fuels), or computed from results using ASTM method D1137-75, D1945-96 or D1946-90 (reapproved 1994) (gaseous fuels) as applicable. These 5 ASTM methods are incorporated by reference in s. NR 440.17 (2) (a) 43., 41., 16., 23. and 24., respectively.

NR 440.19(6)(f)5.b. b. GCV is the gross calorific value (kJ/kg, Btu/lb) of the fuel combusted, determined by the ASTM test methods D2015-96 or D5865-98 for solid fuels and D1826-94 for gaseous fuels as applicable. These 2 ASTM methods are incorporated by reference in s. NR 440.17 (2) (a) 26. and 21., respectively.

NR 440.19(6)(f)5.c. c. For affected facilities which fire both fossil fuels and nonfossil fuels, the F or Fc value shall be subject to the department's approval.

NR 440.19(6)(f)6. 6. For affected facilities firing combinations of fossil fuels or fossil fuels and wood residue, the F or Fc factors determined by subd. 4. or 5. shall be prorated in accordance with the applicable formulas as follows: - See PDF for diagram

Xi is the fraction of total heat input derived from each type of fuel (e.g. natural gas, bituminous coal, wood residue, etc.)

Fi or (Fc)i is the applicable F or Fc factor for each fuel type determined in accordance with subd. 4. or 5.

n is the number of fuels being burned in combination

NR 440.19(6)(g) (g) Excess emission and monitoring system performance reports shall be submitted to the department semiannually for each 6-month period in the calendar year. All semiannual reports shall be postmarked by the 30th day following the end of each 6-month period. Each excess emission and monitoring system performance report shall include the information required in s. NR 440.07 (3). Periods of excess emissions and monitoring systems downtime that shall be reported are defined as follows:

NR 440.19(6)(g)1. 1. Opacity. Excess emissions are defined as any 6-minute period during which the average opacity of emissions exceeds 20% opacity, except that one 6-minute average per hour of up to 27% opacity need not be reported.

NR 440.19(6)(g)2. 2. Sulfur dioxide. Excess emissions for affected facilities are defined as:

NR 440.19(6)(g)2.a. a. Any 3-hour period during which the average emissions (arithmetic average of 3 contiguous one-hour periods) of sulfur dioxide as measured by a continuous monitoring system exceed the applicable standard under sub. (4).

NR 440.19(6)(g)3. 3. Nitrogen oxides. Excess emissions for affected facilities using a continuous monitoring system for measuring nitrogen oxides are defined as any 3-hour period during which the average emissions (arithmetic average of 3 contiguous one-hour periods) exceed the applicable standards under sub. (5).

NR 440.19(7) (7) Test methods and procedures.

NR 440.19(7)(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). Acceptable alternative methods and procedures are given in par. (d).

NR 440.19(7)(b) (b) The owner or operator shall determine compliance with the particulate matter, SO2 and NOx standards in subs. (3), (4) and (5) as follows:

NR 440.19(7)(b)1. 1. The emission rate (E) of particulate matter, SO2 or NOx shall be computed for each run using the following equation:

E = CFd (20.9)/(20.9 - %02)

where:

E is the emission rate of pollutant, ng/J (lb/million Btu)

C is the concentration of pollutant, ng/dscm (lb/dscf)

%O2 is the oxygen concentration, percent dry basis

Fd is the factor as determined from Method 19

NR 440.19(7)(b)2. 2. Method 5 shall be used to determine the particulate matter concentration (C) at affected facilities without wet flue-gas-desulfurization (FGD) systems and Method 5B shall be used to determine the particulate matter concentration (C) after FGD systems.

NR 440.19(7)(b)2.a. a. The sampling time and sample volume for each run shall be at least 60 minutes and 0.85 dscm (30 dscf). The probe and filter holder heating systems in the sampling train shall be set to provide an average gas temperature of 160"14°C (320"25°F).

NR 440.19(7)(b)2.b. b. The emission rate correction factor, integrated or grab sampling and analysis procedure of Method 3B shall be used to determine the O2 concentration (%O2). The O2 sample shall be obtained simultaneously with, and at the same traverse points as, the particulate sample. If the grab sampling procedure is used, the O2 concentration for the run shall be the arithmetic mean of the sample O2 concentrations at all traverse points.

NR 440.19(7)(b)2.c. c. If the particulate run has more than 12 traverse points, the O2 traverse points may be reduced to 12 provided that Method 1 is used to locate the 12 O2 traverse points.

NR 440.19(7)(b)3. 3. Method 9 and the procedures in s. NR 440.11 shall be used to determine opacity.

NR 440.19(7)(b)4. 4. Method 6 shall be used to determine the SO2 concentration.

NR 440.19(7)(b)4.a. a. The sampling site shall be the same as that selected for the particulate sample. The sampling location in the duct shall be at the centroid of the cross section or at a point no closer to the walls than 1 m (3.28 ft). The sampling time and sample volume for each sample run shall be at least 20 minutes and 0.020 dscm (0.71 dscf). Two samples shall be taken during a 1-hour period, with each sample taken within a 30-minute interval.

NR 440.19(7)(b)4.b. b. The emission rate correction factor, integrated sampling and analysis procedure of Method 3B shall be used to determine the O2 concentration (%O2). The O2 sample shall be taken simultaneously with, and at the same point as, the SO2 sample. The SO2 emission rate shall be computed for each pair of SO2 and O2 samples. The SO2 emission rate (E) for each run shall be the arithmetic mean of the results of the 2 pairs of samples.

NR 440.19(7)(b)5. 5. Method 7 shall be used to determine NOx concentration.

NR 440.19(7)(b)5.a. a. The sampling site and location shall be the same as for the SO2 sample. Each run shall consist of 4 grab samples, with each sample taken at about 15-minute intervals.

NR 440.19(7)(b)5.b. b. For each NOx sample, the emission rate correction factor, grab sampling and analysis procedure of Method 3B shall be used to determine the O2 concentration (%O 2). The sample shall be taken simultaneously with, and at the same point as, the NOx sample.

NR 440.19(7)(b)5.c. c. The NOx emission rate shall be computed for each pair of NOx and O2 samples. The NO x emission rate (E) for each run shall be the arithmetic mean of the results of the 4 pairs of samples.

NR 440.19(7)(c) (c) When combinations of fossil fuels or fossil fuel and wood residue are fired, the owner or operator, in order to compute the prorated standard as shown in subs. (4) (b) and (5) (b), shall determine the percentage (w, x, y, or z) of the total heat input derived from each type of fuel as follows:

NR 440.19(7)(c)1. 1. The heat input rate of each fuel shall be determined by multiplying the gross calorific value of each fuel fired by the rate of each fuel burned.

NR 440.19(7)(c)2. 2. ASTM method D2015-96 or D5865-98 (solid fuels), D240-92 (liquid fuels) or D1826-94 (gaseous fuels), incorporated by reference in s. NR 440.17 (2) (a) 26., 66., 9. and 21., respectively, shall be used to determine the gross calorific values of the fuels. The method used to determine the calorific value of wood residue shall be approved by the department.

NR 440.19(7)(c)3. 3. Suitable methods shall be used to determine the rate of each fuel burned during each test period, and a material balance over the steam generating system shall be used to confirm the rate.

NR 440.19(7)(d) (d) The owner or operator may use the following as alternatives to the reference methods and procedures in this subsection or in other subsections as specified:

NR 440.19(7)(d)1. 1. The emission rate (E) of particulate matter, SO2 and NOx may be determined by using the Fc factor, provided that the following procedure is used:

NR 440.19(7)(d)1.a. a. The emission rate (E) shall be computed using the following equation:

E = CFc (100/%CO2)

where:

E is the emission rate of pollutant, ng/J (lb/million Btu)

C is the concentration of pollutant, ng/dscm (lb/dscf)

%CO2 is the carbon dioxide concentration, percent dry basis

Fc is the factor as determined in appropriate sections of Method 19

NR 440.19(7)(d)1.b. b. If and only if the average Fc factor in Method 19 is used to calculate E and either E is from 0.97 to 1.00 of the emission standard or the relative accuracy of a continuous emission monitoring system is from 17 to 20%, then 3 runs of Method 3 shall be used to determine the O2 and CO2 concentration according to the procedures in sub. (7) (b) 2. b., 4. b. or 5. b. Then if Fo (average of 3 runs), as calculated from the equation in Method 3B, is more than "3% than the average Fo value, as determined from the average values of Fd and Fc in Method 19, that is, Foa = 0.209 (Fda/Fca), then the following procedure shall be followed:

1) When Fo is less than 0.97 Foa, then E shall be increased by that proportion under 0.97 Foa. For example, if Fo is 0.95 Foa, E shall be increased by 2%. This recalculated value shall be used to determine compliance with the emission standard.

2) When Fo is less than 0.97 Foa and when the average difference (d) between the continuous monitor minus the reference methods is negative, then E shall be increased by that proportion under 0.97 Foa. For example, if Fo is 0.95 Foa, E shall be increased by 2%. This recalculated value shall be used to determine compliance with the relative accuracy specification.

3) When Fo is greater than 1.03 Foa and when the average difference d is positive, then E shall be decreased by that proportion over 1.03 Foa. For example, if Fo is 1.05 Foa, E shall be decreased by 2%. This recalculated value shall be used to determine compliance with the relative accuracy specification.