NR 446.18(3)
(3) Determining annual fuel mercury content. Owners and operators of a coal-fired EGU affected by this subchapter shall determine the annual mass of mercury contained in all combusted fuels, as required to demonstrate compliance, according to the following procedures:
NR 446.18(3)(a)
(a) Calculate the mass of mercury contained in each fuel for each month, according to Equation 2, as the mercury concentration in fuel combusted each month as determined following the procedures in
s. NR 446.07 (1),
(2) and
(3) according to solid and non-solid types of fuel, multiplied by the amount of fuel, in mmBtu, combusted each month as determined following the procedures in
s. NR 446.07 (4).
where:
Fuel Hgfm is the mass of mercury contained in fuel f, in month m
HIfm is the heat input of the combusted fuel f, in month m
Hg Cfm is the mercury concentration for fuel f, in month m
NR 446.18(3)(b)
(b) Calculate the annual mass of mercury, according to Equation 3, as the sum of mercury contained in all fuels combusted for all months during the compliance year.
where:
Fuel Hgannual is the mass amount of mercury contained in all fuels combusted during the compliance year
Fuel Hgi is the mercury mass content for fuel i, combusted in month m, during the compliance year determined in par. (a)
f is number of fuels combusted during the compliance month
NR 446.18(4)
(4) Determining annual gross output. Owners and operators of a coal-fired EGU affected by this subchapter shall determine the annual gross energy output in gigawatt-hours, as required to demonstrate compliance, according to the following procedures:
NR 446.18(4)(a)
(a) Calculate the annual gross electric output in gigawatt-hours, according to Equation 4, as the sum of gross electric output measured in megawatt-hours for each hour the EGU is operating.
where:
EGWh is the total annual gross electric output in GWh
MWhi is the gross electric output in MWh for each hour i the EGU operated during the compliance year
1,000 is the factor to convert MWh to GWh
n is the number of hours the EGU operated during the compliance year
NR 446.18(4)(b)
(b) Calculate the annual amount of useful thermal energy in mmBtu, according to Equation 5, as the sum of the process thermal energy input for each hour the EGU is operated multiplied by the process energy efficiency.
where:
UTEannual is the annual amount of thermal energy, in mmBtu, utilized in the cogeneration process
PTEIi is the amount of thermal energy input, in mmBtu, made available to the cogeneration process for each hour i the EGU operated during the compliance year
PEE is the process energy efficiency, expressed as a percent, measured for the EGU. A value of 50% may be assumed.
n is the number of hours the unit operated during the year of compliance
NR 446.18(4)(c)
(c) Calculate the annual gross energy output in mmBtu, according to Equation 6, as the sum of the annual gross electric output and the annual applied thermal energy converted to electric output.
where:
GEOGWh is the total annual gross energy output in GWh
EGWh is the total annual gross electric output in GWh determined in par. (a)
UTEannual is the total annual useful thermal energy in mmBtu determined in par. (b)
3,413 is the factor to convert thermal energy in mmBtu to GWh
NR 446.18(5)
(5) Determining annual allowable emissions. Except as provided in
s. NR 446.185, owners and operators of a coal-fired EGU affected by this subchapter shall determine annual allowable emissions, as required to demonstrate compliance, according to the following procedures:
NR 446.18(5)(a)
(a) When achieving compliance on a unit-by-unit basis, use one of the following equations as applicable:
NR 446.18(5)(a)1.
1. For a percent reduction mercury emission limitation, Equation 7.
where:
Hgallowable is the mass of mercury emissions allowed for the compliance year
Fuel Hgannual is the mass of mercury in fuel combusted during the compliance year as determined in sub. (3) (b).
Hg CE is the applicable requirement for percent mercury emission reduction divided by 100.
where:
Hgallowable is the mass of mercury emissions in pounds allowed for the compliance year
GEOGWh is the annual gross energy output during the compliance year as determined in sub. (4) (c)
ELoutput is the applicable mercury output based emission limitation in pounds per GWh
where:
Pallowable is the mass of NOx or SO2 emissions allowed for the compliance year
HIi is the amount of fuel, in mmBtu combusted each hour i, during the compliance year
h is the number of hours fuel is combusted during the compliance year
EL
p is the applicable emission limitation of
s. NR 446.14 (1) for NO
x or SO
2
where:
Unit Averaging Pallowable is the mass of mercury, NOx, or SO2 emissions allowed for each pollutant determined in par. (a) for each EGU participating in emissions averaging during the compliance year
Pu is the lowest annual allowable mass of mercury, NOx or SO2 emissions allowed for the compliance year for each EGU as determined under par. (a) or applicable under any other enforceable state or federal requirement for each EGU participating in emissions averaging during the compliance year
n is the number of EGUs participating in emissions averaging
NR 446.18 History
History: CR 07-036: cr.
Register November 2008 No. 635, eff. 12-1-08.
NR 446.185(1)
(1)
Alternative annual allowable mercury emissions. NR 446.185(1)(a)(a) Owners and operators of a coal-fired EGU affected by this subchapter may use baseline mercury emissions approved by the department as an alternative to procedures in
s. NR 446.18 (5) (a) in determining annual allowable mercury emissions.
NR 446.185(1)(b)
(b) Baseline mercury emissions shall be determined and used for calculating annual allowable mercury emissions for 5-year periods beginning with the period of 2016 to 2020. Baseline mercury emissions shall be determined every 5 years and used to calculate annual allowable mercury emissions for the subsequent 5-year period.
NR 446.185(1)(c)
(c) Baseline mercury emissions for each 5-year period shall be determined using fuel mercury content data measured for the calendar year which is 2 years prior to the first year of the applicable 5-year period. The year designated for measuring fuel mercury content is the baseline determination year.
NR 446.185 Note
Note: Baseline emissions are measured for 2013 for determining the annual allowable emissions for compliance years 2015 to 2019, measured for 2018 for determining allowable emissions for compliance years 2020 through 2024, etc.
NR 446.185(1)(d)
(d) No later than May 1 of the calendar year after the baseline determination year, the owner or operator of a coal-fired EGU shall submit a report to the department that includes information necessary to determine the baseline mercury emissions for that 5-year period.
NR 446.185(1)(e)
(e) In the report required under
par. (d), the owners or operators of a coal-fired EGU may request alternative data be used for determining baseline emissions if the data for the specified year is not representative of the EGU's normal operations or maintenance schedule.
NR 446.185(1)(f)
(f) Baseline mercury emissions for each EGU shall be determined according to the following procedures:
NR 446.185(1)(f)1.
1. Measure and determine the fuel mercury content according to requirements of
s. NR 446.18 (3) for all fuels combusted in the EGU for the baseline determination year.
NR 446.185(1)(f)2.
2. Calculate the baseline mercury concentration, on a mmBtu-basis, for the baseline determination year according to Equation 11.
where:
BMC is the average baseline mercury concentration of fuel, in pounds per mmBtu, contained in the fuels combusted in the EGU during the baseline determination year
Fuel Hgannual is the total mass of mercury contained in the fuel determined in subd. 1.
HIi is the total amount of fuel, in mmBtu, consumed each hour i, during the baseline determination year
h is the total number of hours fuel is consumed during the baseline determination year
NR 446.185(1)(f)3.
3. Calculate the baseline mercury emissions according to Equation 12 as the baseline mercury concentration times the 3-year average of annual fuel consumption, in mmBtu, for the baseline determination year and 2 years prior to the baseline determination year.
where:
BME is the baseline mercury emissions for the EGU in pounds
BMC is the baseline mercury concentration for the EGU determined in subd. 2., in pounds per mmBtu.
HIi is the amount of fuel, in mmBtu combusted in the EGU for each hour i during each year y
h is the total number of hours fuel is combusted in the EGU during each year
NR 446.185(1)(g)
(g) When determining annual allowable mercury emissions for achieving compliance on a unit-by-unit basis, use one of the following equations as applicable:
