Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 225 - CONTROL OF EMISSIONS FROM LARGE COMBUSTION SOURCES
Subpart B - CONTROL OF MERCURY EMISSIONS FROM COAL-FIRED ELECTRIC GENERATING UNITS
Section 225.230 - Emission Standards for EGUs at Existing Sources
Current through Register Vol. 48, No. 38, September 20, 2024
a) Emission Standards.
Where:
ER |
= |
Mercury emissions rate of the EGU during QAMO hours for the particular 12-month rolling period, expressed in lb/GWh. |
Ei |
= |
Mercury emissions of the EGU during QAMO hours, in lbs, in an individual month in the 12-month rolling period, as determined in accordance with the emissions monitoring provisions of this Subpart B. |
Oi |
= |
Gross electrical output of the EGU during QAMO hours, in GWh, in an individual month in the 12-month rolling period, as determined in accordance with Section 225.263 of this Subpart B. |
Where:
CE |
= |
Control efficiency for mercury emissions of the EGU during QAMO hours for the particular 12-month rolling period, expressed as a percent. |
Ei |
= |
Mercury emissions of the EGU, in lbs during QAMO hours, in an individual month in the 12-month rolling period, as determined in accordance with the emissions monitoring provisions of this Subpart B. |
Ii |
= |
Amount of mercury in the fuel fired in the EGU during QAMO hours, in lbs, in an individual month in the 12-month rolling period, as determined in accordance with Section 225.265 of this Subpart B. Ii is determined by multiplying the amount of mercury in the fuel fired in the EGU in month i by the number of QAMO hours in that month, and dividing that product by the number of EGU operating hours in that month. |
b) Alternative Emission Standards for Single EGUs.
Where:
E12 |
= |
Mercury emissions of the EGU during QAMO hours for the particular 12-month rolling period. |
A12 |
= |
Allowable mercury emissions of the EGU during QAMO hours for the particular 12-month rolling period. |
Ei |
= |
Mercury emissions of the EGU during QAMO hours in an individual month in the 12-month rolling period. |
Ai |
= |
Allowable mercury emissions of the EGU during QAMO hours in an individual month in the 12-month rolling period, based on either the input mercury to the unit (AInput i) or the electrical output from the EGU (AOutput i), as selected by the owner or operator of the EGU for that given month. Ai is determined by multiplying the allowable mercury emissions based on either input mercury or electrical output in month i by the number of QAMO hours in that month, and dividing that product by the number of EGU operating hours in that month. |
AInput i |
= |
Allowable mercury emissions of the EGU in an individual month based on the input mercury to the EGU, calculated as 10.0 percent (or 0.100) of the input mercury to the EGU. |
AOutput i |
= |
Allowable mercury emissions of the EGU in a particular month based on the electrical output from the EGU, calculated as the product of the output based mercury limit, i.e., 0.0080 lb/GWh, and the electrical output from the EGU, in GWh. |
c) If two or more EGUs are served by common stacks and the owner or operator conducts monitoring for mercury emissions in the common stacks, as provided for by Sections 1.14 through 1.18 of Appendix B to this Part, such that the mercury emissions of each EGU are not determined separately, compliance of the EGUs with the applicable emission standards of this Subpart B must be determined as if the EGUs were a single EGU.
d) Alternative Emission Standards for Multiple EGUs.
Where:
ES |
= |
Sum of the mercury emissions of the EGUs at the source during QAMO hours. |
AS |
= |
Sum of the allowable mercury emissions of the EGUs at the source during QAMO hours. |
Ei |
= |
Mercury emissions of an individual EGU at the source during QAMO hours, as determined in accordance with subsection (b)(2) of this Section. |
Ai |
= |
Allowable mercury emissions of an individual EGU at the source during QAMO hours, as determined in accordance with subsection (b)(2) of this Section. |
n |
= |
Number of EGUs covered by the demonstration. |