NR 440.207(2)(em)(em) “Combustion research” means the experimental firing of any fuel or combination of fuels in a steam generating unit for the purpose of conducting research and development of more efficient combustion or more effective prevention or control of air pollutant emissions from combustion, provided that, during these periods of research and development, the heat generated is not used for any purpose other than preheating combustion air for use by that steam generating unit (that is, the heat generated is released to the atmosphere without being used for space heating, process heating, driving pumps, preheating combustion air for other units, generating electricity or any other purpose). NR 440.207(2)(f)(f) “Conventional technology” means wet flue gas desulfurization technology, dry flue gas desulfurization technology, atmospheric fluidized bed combustion technology and oil hydrodesulfurization technology. NR 440.207(2)(g)(g) “Distillate oil” means fuel oil that complies with the specifications for fuel oil number 1 or 2, as defined by the American Society for Testing and Materials in ASTM D396-98, Standard Specification for Fuel Oils, incorporated by reference in s. NR 440.17 (2) (a) 13. NR 440.207(2)(h)(h) “Dry flue gas desulfurization technology” means a sulfur dioxide (SO2) control system that is located between the steam generating unit and the exhaust vent or stack, and that removes sulfur oxides from the combustion gases of the steam generating unit by contacting the combustion gases with an alkaline slurry or solution and forming a dry powder material. This definition includes devices where the dry powder material is subsequently converted to another form. Alkaline reagents used in dry flue gas, desulfurization systems include, but are not limited to, lime and sodium compounds. NR 440.207(2)(i)(i) “Duct burner” means a device that combusts fuel and that is placed in the exhaust duct from another source, such as a stationary gas turbine, internal combustion engine, kiln, and other similar devices, to allow the firing of additional fuel to heat the exhaust gases before the exhaust gases enter a steam generating unit. NR 440.207(2)(j)(j) “Emerging technology” means any SO2 control system that is not defined as a conventional technology under this subsection, and for which the owner or operator of the affected facility has received approval from the administrator to operate as an emerging technology under sub. (9) (a) 4. NR 440.207(2)(L)(L) “Fluidized bed combustion technology” means a device wherein fuel is distributed onto a bed, or series of beds, of limestone aggregate, or other sorbent materials, for combustion; and these materials are forced upward in the device by the flow of combustion air and the gaseous products of combustion. Fluidized bed combustion technology includes, but is not limited to, bubbling bed units and circulating bed units. NR 440.207(2)(m)(m) “Fuel pretreatment” means a process that removes a portion of the sulfur in a fuel before combustion of the fuel in a steam generating unit. NR 440.207(2)(n)(n) “Heat input” means heat derived from combustion of fuel in a steam generating unit and does not include the heat derived from preheated combustion air, recirculated flue gases, or exhaust gases from other sources, such as stationary gas turbines, internal combustion engines and kilns. NR 440.207(2)(o)(o) “Heat transfer medium” means any material that is used to transfer heat from one point to another point. NR 440.207(2)(p)(p) “Maximum design heat input capacity” means the ability of a steam generating unit to combust a stated maximum amount of fuel, or combination of fuels, on a steady state basis as determined by the physical design and characteristics of the steam generating unit. NR 440.207(2)(q)1.1. A naturally occurring mixture of hydrocarbon and nonhydrocarbon gases found in geologic formations beneath the earth’s surface, of which the principal constituent is methane, or NR 440.207(2)(q)2.2. Liquified petroleum (LP) gas, as defined by the American Society for Testing and Materials in ASTM D1835-03a, Standard Specification for Liquified Petroleum Gases, incorporated by reference in s. NR 440.17 (2) (a) 22. NR 440.207(2)(r)(r) “Noncontinental area” means the state of Hawaii, the Virgin Islands, Guam, American Samoa, the commonwealth of Puerto Rico or the Northern Mariana Islands. NR 440.207(2)(s)(s) “Oil” means crude oil or petroleum, or a liquid fuel derived from crude oil or petroleum, including distillate oil and residual oil. NR 440.207(2)(t)(t) “Potential sulfur dioxide emission rate” means the theoretical SO2 emissions, nanograms per joule (ng/J) or pounds per million Btu (lb/million Btu) heat input, that would result from combusting fuel in an uncleansed state and without using emission control systems. NR 440.207(2)(u)(u) “Process heater” means a device that is primarily used to heat a material to initiate or promote a chemical reaction to which the material participates as a reactant or catalyst. NR 440.207(2)(v)(v) “Residual oil” means crude oil, fuel oil that does not comply with the specifications under the definition of distillate oil, and all fuel oil numbers 4, 5 and 6, as defined by the American Society for Testing and Materials in ASTM D396-98, Standard Specification for Fuel Oils, incorporated by reference in s. NR 440.17 (2) (a) 13. NR 440.207(2)(w)(w) “Steam generating unit” means a device that combusts any fuel and produces steam or heats water or any other heat transfer medium. This term includes any duct burner that combusts fuel and is part of a combined cycle system. This term does not include process heaters as defined in this section. NR 440.207(2)(x)(x) “Steam generating unit operating day” means a 24-hour period between 12:00 midnight and the following midnight during which any fuel is combusted at any time in the steam generating unit. It is not necessary for fuel to be combusted continuously for the entire 24-hour period. NR 440.207(2)(y)(y) “Wet flue gas desulfurization technology” means an SO2 control system that is located between the steam generating unit and the exhaust vent or stack, and that removes sulfur oxides from the combustion gases of the steam generating unit by contacting the combustion gases with an alkaline slurry or solution and forming a liquid material. This definition includes devices where the liquid material is subsequently converted to another form. Alkaline reagents used in wet flue gas desulfurization systems include, but are not limited to, lime, limestone and sodium compounds. NR 440.207(2)(z)(z) “Wet scrubber system” means any emission control device that mixes an aqueous stream or slurry with the exhaust gases from a steam generating unit to control emissions of particulate matter (PM) or SO2. NR 440.207(2)(zm)(zm) “Wood” means wood, wood residue, bark or any derivative fuel or residue thereof, in any form, including but not limited to sawdust, sanderdust, wood chips, scraps, slabs, millings, shavings and processed pellets made from wood or other forest residues. NR 440.207(3)(a)(a) Except as provided in pars. (b), (c) and (e), on and after the date on which the initial performance test is completed or required to be completed under s. NR 440.08, whichever date comes first, the owner or operator of an affected facility that combusts only coal may neither: NR 440.207(3)(a)1.1. Cause to be discharged into the atmosphere from that affected facility any gases that contain SO2 in excess of 10% (0.10) of the potential SO2 emission rate, 90% reduction; nor NR 440.207(3)(a)2.2. Cause to be discharged into the atmosphere from that affected facility any gases that contain SO2 in excess of 520 ng/J (1.2 lb/million Btu) heat input. If coal is combusted with other fuels, the affected facility is subject to the 90% SO2 reduction requirement specified in this paragraph and the emission limit is determined pursuant to par. (e) 2. NR 440.207(3)(b)(b) Except as provided in pars. (c) and (e), on and after the date on which the initial performance test is completed or required to be completed under s. NR 440.08, whichever date comes first, the owner or operator of an affected facility that: