SUBTITLE B: AIR POLLUTION
CHAPTER I: POLLUTION CONTROL BOARD
SUBCHAPTER c: EMISSION STANDARDS AND LIMITATIONS FOR STATIONARY SOURCES
PART 217 NITROGEN OXIDES EMISSIONS
SECTION 217.164 EMISSIONS LIMITATIONS
Section 217.164 Emissions Limitations
a) Except as provided for under Section 217.152, on and after January 1, 2015, no person shall cause or allow emissions of NOx into the atmosphere from any industrial boiler to exceed the following limitations. Until July 1, 2025, compliance must be demonstrated with the applicable emissions limitation on an ozone season and annual basis. On and after July 1, 2025, compliance must be demonstrated with the applicable emissions limitation on a 30-day rolling average basis.
|
Fuel |
Emission Unit Type and Rated Heat Input Capacity (mmBtu/hr) |
NOx Emissions Limitation (lb/mmBtu) or Requirement Before July 1, 2025 |
|
Natural Gas or Other Gaseous Fuels |
Industrial boiler greater than 100 |
0.08 |
|
|
Industrial boiler less than or equal to 100 |
Combustion tuning |
|
Distillate Fuel Oil |
Industrial boiler greater than 100 |
0.10 |
|
|
Industrial boiler less than or equal to 100 |
Combustion tuning |
|
Other Liquid Fuels |
Industrial boiler greater than 100 |
0.15 |
|
|
Industrial boiler less than or equal to 100 |
Combustion tuning |
|
Solid Fuel |
Industrial boiler greater than 100, circulating fluidized bed combustor |
0.12 |
|
|
Industrial boiler greater than 250 |
0.18 |
|
|
Industrial boiler greater than 100 but less than or equal to 250 |
0.25 |
|
|
Industrial boiler less than or equal to 100 |
Combustion tuning |
|
Fuel |
NOx Emission Unit Type and Rated Heat Input Capacity (mmBtu/hr) |
Limitation (lb/mmBtu) or Requirement On and after July 1, 2025 |
|
Natural Gas or Other Gaseous Fuels |
Industrial boiler greater than 50 |
0.08 |
|
|
Industrial boiler less than or equal to 50 |
Combustion tuning |
|
Distillate Fuel Oil |
Industrial boiler greater than 50 |
0.10 |
|
|
Industrial boiler less than or equal to 50 |
Combustion tuning |
|
Other Liquid Fuels |
Industrial boiler greater than 50 |
0.15 |
|
|
Industrial boiler less than or equal to 50 |
Combustion tuning |
|
Solid Fuel |
Industrial boiler greater than 50, circulating fluidized bed combustor |
0.10 |
|
|
Industrial boiler greater than 250 |
0.15 |
|
|
Industrial boiler greater than 50 but less than or equal to 250 |
0.20 |
|
|
Industrial boiler less than or equal to 50 |
Combustion tuning |
b) For an industrial boiler combusting a combination of natural gas, coke oven gas, and blast furnace gas, the NOx emissions limitation must be calculated using the following equation:
|
NOx emissions limitation for period in lb/mmBtu |
= |
|
Where:
|
|
= |
0.084 lb/mmBtu for natural gas |
|
|
= |
the heat inpu of natural gas in Btu over that period |
|
|
= |
0.144 lb/mmBtu for coke oven gas |
|
|
= |
the heat input of coke oven gas in Btu over that period |
|
|
= |
0.0288 lb/mmBtu for blast furnace gas |
|
|
= |
the heat input of blast furnace gas in Btu over that period |
(Source: Amended at 49 Ill. Reg. 6355, effective April 23, 2025)