Code of Federal Regulations > Title 40 > Chapter I > Part 98 > Subpart AA > Appendix - Table AA-2 to Subpart AA of Part 98—Kraft Lime Kiln and Calciner Emissions Factors for CH4 and N2O

Regulations last checked for updates: Feb 21, 2025

Title 40 - Protection of Environment last revised: Nov 21, 2025

Appendix - Table AA-2 to Subpart AA of Part 98—Kraft Lime Kiln and Calciner Emissions Factors for CH4 and N2O

Fuel	Fossil fuel-based emissions factors (kg/mmBtu HHV)
	Kraft rotary lime kilns		Kraft calciners ^a
	CH4	N2O	CH4	N2O
Residual Oil (any type)	0.0027	0	0.0027	0.0003
Distillate Oil (any type)	0.0027	0	0.0027	0.0004
Natural Gas	0.0027	0	0.0027	0.0001
Biogas	0.0027	0	0.0027	0.0001
Petroleum coke	0.0027	0	^b NA	^b NA
Other Fuels	See Table C-2	0	See Table C-2	See Table C-2

^a Includes, for example, fluidized bed calciners at kraft mills.

^b Emission factors for kraft calciners are not available.

[78 FR 71965, Nov. 29, 2013, as amended at 81 FR 89264, Dec. 9, 2016]

authority: 42 U.S.C. 7401-7671q.

source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.