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 NO_x into the atmosphere from any industrial boiler to exceed the following limitations. Compliance must be demonstrated with the applicable emissions limitation on an ozone season and annual basis.

Fuel	Emission Unit Type and Rated Heat Input Capacity (mmBtu/hr)	No_x Emissions Limitation (lb/mmBtu) or Requirement
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

b) For an industrial boiler combusting a combination of natural gas, coke oven gas, and blast furnace gas, the NO_x emissions limitation shall be calculated using the following equation:

NO_x 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 35 Ill. Reg. 14627, effective August 22, 2011)