flData from EPA, Compilation of Air Pollutant Emission Factors, AP-42, Fifth ed., U.S. Environmental Protection Agency, U.S. Government Printing Office, Washington, D.C., January 1995. Tons are short tons. To convert from lb/ton to lcg/Mg, multiply by 0.5. To convert from lb/ton to lb/MM Btu, multiply by 0.0625. ND, no data.

^S = wt.% sulfur content of lignite, wet basis; for example, if the sulfur content equals 3.4%, then S = 3.4. For high-sodium ash (Na20 > 8%), use 22S. For low-sodium ash (Na20 < 2%), use 34S. If ash sodium content is unknown, use 30S.

cWall-fired includes front- and rear-wall-fired units, as well as opposed-wall-fired units; NSPS, New Source Performance Standard. ^Pre-NSPS boilers are not subject to an NSPS. NSPS boilers are subject to Subpart D or Subpart D(a). Subpart D boilers are boilers constructed after August 17, 1971, with a heat input greater than 250 million Btu per hour (MM Btu/hr). Subpart D(a) boilers are boilers constructed after September 18, 1978, with a heat input rate greater than 250 MM Btu/hr.

eEmission factor rating: B. C = wt.% carbon of lignite, as-fired basis; for example, if carbon content equals 63%, then C = 63. If the %C value is not known, a default CO2 emission value of 4600 lb/ton may be used. ^Emission factor rating: A.

® TNMOC: Total non-methane organic compounds. Emission factors were derived from bituminous coal data in the absence of lignite data assuming emissions are proportional to coal heating value. TNMOC are expressed as C2 to C15 allcane equivalents. Because of limited data, the effects of firing configuration on TNMOC emission factors could not be distinguished. As a result, all data were averaged collectively to develop a single average emission factor for pulverized coal, cyclones, spreaders, and overfeed stokers.

^Nominal values achievable under normal operating conditions; values 1 or 2 orders of magnitude higher can occur when combustion is not complete. 3Using limestone bed material.

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